11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 2943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan * Copyright (C) 2008, 2009 The Android Open Source Project 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions of source code must retain the above copyright 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions in binary form must reproduce the above copyright 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * the documentation and/or other materials provided with the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 294688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <dlfcn.h> 304688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <errno.h> 314688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <fcntl.h> 320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes#include <inttypes.h> 334688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <pthread.h> 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdlib.h> 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <string.h> 374688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/mman.h> 384688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/stat.h> 394688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <unistd.h> 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 414688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Private C library headers. 42eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/bionic_tls.h" 43eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/KernelArgumentBlock.h" 44eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/ScopedPthreadMutexLocker.h" 4504dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov#include "private/ScopedFd.h" 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker.h" 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker_debug.h" 49be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner#include "linker_environ.h" 5023363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner#include "linker_phdr.h" 51d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov#include "linker_allocator.h" 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Do NOT use malloc() and friends or pthread_*() code here. 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Don't use printf() either; it's caused mysterious memory 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * corruption in the past. 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The linker runs before we bring up libc and it's easiest 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * to make sure it does not depend on any complex libc features 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * open issues / todo: 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - cleaner error reporting 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - after linking, set as much stuff as possible to READONLY 651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * and NOEXEC 664688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes */ 671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 68489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#if defined(__LP64__) 69489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#define SEARCH_NAME(x) x 70489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#else 71489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov// Nvidia drivers are relying on the bug: 72489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov// http://code.google.com/p/android/issues/detail?id=6670 73489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov// so we continue to use base-name lookup for lp32 74489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanovstatic const char* get_base_name(const char* name) { 75489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov const char* bname = strrchr(name, '/'); 76489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return bname ? bname + 1 : name; 77489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov} 78489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#define SEARCH_NAME(x) get_base_name(x) 79489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#endif 80489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov 81183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo); 820266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf); 831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 841728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic LinkerAllocator<soinfo> g_soinfo_allocator; 85d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic LinkerAllocator<LinkedListEntry<soinfo>> g_soinfo_links_allocator; 86ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 87d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo* solist; 88d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo* sonext; 89d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* somain; /* main process, always the one after libdl_info */ 901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 911728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic const char* const kDefaultLdPaths[] = { 924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 93011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/vendor/lib64", 94011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/system/lib64", 95011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#else 96124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/vendor/lib", 97124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/system/lib", 98011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#endif 99124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes NULL 100124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes}; 101124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes 102a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_BUFSIZE (LDPATH_MAX*64) 103a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_MAX 8 104a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 105a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_BUFSIZE (LDPRELOAD_MAX*64) 106a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_MAX 8 107a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 1081728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic char g_ld_library_paths_buffer[LDPATH_BUFSIZE]; 1091728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic const char* g_ld_library_paths[LDPATH_MAX + 1]; 110bc3a5c26f1b9cf29da6abfc3e197258ef4c03362David Bartley 1111728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic char g_ld_preloads_buffer[LDPRELOAD_BUFSIZE]; 1121728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic const char* g_ld_preload_names[LDPRELOAD_MAX + 1]; 1134fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1141728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic soinfo* g_ld_preloads[LDPRELOAD_MAX + 1]; 1154fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1161728b2396591853345507a063ed6075dfd251706Elliott Hughes__LIBC_HIDDEN__ int g_ld_debug_verbosity; 1171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1181728b2396591853345507a063ed6075dfd251706Elliott Hughes__LIBC_HIDDEN__ abort_msg_t* g_abort_message = NULL; // For debuggerd. 1190d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes 120bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesenum RelocationKind { 121bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocAbsolute = 0, 122bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocRelative, 123bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocCopy, 124bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocSymbol, 125bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocMax 126bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 127be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 1281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 129bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstruct linker_stats_t { 130bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes int count[kRelocMax]; 131bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 132bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 133bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic linker_stats_t linker_stats; 134bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 135bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind kind) { 136bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes ++linker_stats.count[kind]; 137bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 138bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 139bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind) { 140bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 1411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 144bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic unsigned bitmask[4096]; 145e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 146e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#define MARK(offset) \ 147e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland do { \ 148e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((((offset) >> 12) >> 5) < 4096) \ 149e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \ 150faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 151e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 152bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(offset) \ 153bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes do { \ 154bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ 155faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 156e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 157bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 158bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(x) do {} while (0) 1591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1614688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// You shouldn't try to call memory-allocating functions in the dynamic linker. 1624688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Guard against the most obvious ones. 1638f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes#define DISALLOW_ALLOCATION(return_type, name, ...) \ 1648f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes return_type name __VA_ARGS__ \ 1658f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes { \ 16612bf3bcdeeaa0dcdc7a4f4e4d11bc2fc3bf6bd7aDmitriy Ivanov __libc_fatal("ERROR: " #name " called from the dynamic linker!\n"); \ 1674688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 168812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, malloc, (size_t u __unused)); 169812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void, free, (void* u __unused)); 170812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, realloc, (void* u1 __unused, size_t u2 __unused)); 171812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, calloc, (size_t u1 __unused, size_t u2 __unused)); 1722e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 1730353195f344666256dba474a15c9ba22cf0cccc9Dima Zavinstatic char tmp_err_buf[768]; 1742e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavinstatic char __linker_dl_err_buf[768]; 1752e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 176650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hugheschar* linker_get_error_buffer() { 1775419b9474753d25dff947c7740532f86d130c0beElliott Hughes return &__linker_dl_err_buf[0]; 1782e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin} 1792e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 180650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughessize_t linker_get_error_buffer_size() { 181650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return sizeof(__linker_dl_err_buf); 182650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes} 183650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 1841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 1851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This function is an empty stub where GDB locates a breakpoint to get notified 1861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about linker activity. 1871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 1885419b9474753d25dff947c7740532f86d130c0beElliott Hughesextern "C" void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity(); 1891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1901728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic pthread_mutex_t g__r_debug_mutex = PTHREAD_MUTEX_INITIALIZER; 1913a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic r_debug _r_debug = {1, NULL, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0}; 1923a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic link_map* r_debug_tail = 0; 1931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1943a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic void insert_soinfo_into_debug_map(soinfo* info) { 195bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Copy the necessary fields into the debug structure. 1963a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 197ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov map->l_addr = info->load_bias; 198faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes map->l_name = reinterpret_cast<char*>(info->name); 1993a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes map->l_ld = info->dynamic; 2001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Stick the new library at the end of the list. 2021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * gdb tends to care more about libc than it does 2031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about leaf libraries, and ordering it this way 2041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * reduces the back-and-forth over the wire. 2051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 2061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (r_debug_tail) { 2071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail->l_next = map; 2081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = r_debug_tail; 2091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 2111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 2121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = 0; 2131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 2161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 218bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void remove_soinfo_from_debug_map(soinfo* info) { 2193a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 2205e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 221bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (r_debug_tail == map) { 2225e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev r_debug_tail = map->l_prev; 223bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2245e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 225bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_prev) { 226bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_prev->l_next = map->l_next; 227bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 228bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_next) { 229bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_next->l_prev = map->l_prev; 230bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2315e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2325e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 233bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_load(soinfo* info) { 2341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (info->flags & FLAG_EXE) { 2351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project // GDB already knows about the main executable 2361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 2371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2391728b2396591853345507a063ed6075dfd251706Elliott Hughes ScopedPthreadMutexLocker locker(&g__r_debug_mutex); 2401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2413a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project insert_soinfo_into_debug_map(info); 2451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2463a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2485e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2495e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 250bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_unload(soinfo* info) { 2515e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev if (info->flags & FLAG_EXE) { 2525e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev // GDB already knows about the main executable 2535e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev return; 2545e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev } 2555e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2561728b2396591853345507a063ed6075dfd251706Elliott Hughes ScopedPthreadMutexLocker locker(&g__r_debug_mutex); 2575e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2583a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_DELETE; 2595e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2605e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2615e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev remove_soinfo_from_debug_map(info); 2625e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2633a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2645e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 26718a206c81d9743481e364384affd43306911283dElliott Hughesvoid notify_gdb_of_libraries() { 2683a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2693a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2703a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2713a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 274d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy IvanovLinkedListEntry<soinfo>* SoinfoListAllocator::alloc() { 275d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return g_soinfo_links_allocator.alloc(); 276d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 277d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 278d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid SoinfoListAllocator::free(LinkedListEntry<soinfo>* entry) { 279d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.free(entry); 280d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 281d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 282d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic void protect_data(int protection) { 283d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_allocator.protect_all(protection); 284d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.protect_all(protection); 285d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 286d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 287d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo* soinfo_alloc(const char* name, struct stat* file_stat) { 288ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (strlen(name) >= SOINFO_NAME_LEN) { 289ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("library name \"%s\" too long", name); 290ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 291ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 292ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 2931728b2396591853345507a063ed6075dfd251706Elliott Hughes soinfo* si = g_soinfo_allocator.alloc(); 2941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 295ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Initialize the new element. 296ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn memset(si, 0, sizeof(soinfo)); 297ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn strlcpy(si->name, name, sizeof(si->name)); 298d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->flags = FLAG_NEW_SOINFO; 299d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 300d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (file_stat != NULL) { 301d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->set_st_dev(file_stat->st_dev); 302d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->set_st_ino(file_stat->st_ino); 303d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 304d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 305ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext->next = si; 306ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext = si; 3071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 308ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: allocated soinfo @ %p", name, si); 309ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return si; 3101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 312faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesstatic void soinfo_free(soinfo* si) { 3134688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (si == NULL) { 3144688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return; 3154688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 3164688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 317d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (si->base != 0 && si->size != 0) { 318d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov munmap(reinterpret_cast<void*>(si->base), si->size); 319d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 320d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 3211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *prev = NULL, *trav; 3221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 323ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: freeing soinfo @ %p", si->name, si); 3241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 325d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (trav = solist; trav != NULL; trav = trav->next) { 3261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == si) 3271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 3281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev = trav; 3291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == NULL) { 331d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* si was not in solist */ 3324688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("name \"%s\" is not in solist!", si->name); 3331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 3341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 336d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // clear links to/from si 337d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->remove_all_links(); 338d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 339be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner /* prev will never be NULL, because the first entry in solist is 3401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project always the static libdl_info. 3411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 3421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev->next = si->next; 343d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si == sonext) { 344d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom sonext = prev; 345d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 346d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov 3471728b2396591853345507a063ed6075dfd251706Elliott Hughes g_soinfo_allocator.free(si); 3481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 350cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 351cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_path(const char* path, const char* delimiters, 352cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes const char** array, char* buf, size_t buf_size, size_t max_count) { 353cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (path == NULL) { 354cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return; 355cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 356cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 357cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t len = strlcpy(buf, path, buf_size); 358cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 359cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t i = 0; 360cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes char* buf_p = buf; 361cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { 362cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (*array[i] != '\0') { 363cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes ++i; 364cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 365cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 366cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 367cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // Forget the last path if we had to truncate; this occurs if the 2nd to 368cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // last char isn't '\0' (i.e. wasn't originally a delimiter). 369cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { 370cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i - 1] = NULL; 371cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } else { 372cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i] = NULL; 373cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 374cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 375cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 376cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_LIBRARY_PATH(const char* path) { 3771728b2396591853345507a063ed6075dfd251706Elliott Hughes parse_path(path, ":", g_ld_library_paths, 3781728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_library_paths_buffer, sizeof(g_ld_library_paths_buffer), LDPATH_MAX); 379cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 380cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 381cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_PRELOAD(const char* path) { 382cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // We have historically supported ':' as well as ' ' in LD_PRELOAD. 3831728b2396591853345507a063ed6075dfd251706Elliott Hughes parse_path(path, " :", g_ld_preload_names, 3841728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads_buffer, sizeof(g_ld_preloads_buffer), LDPRELOAD_MAX); 385cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 386cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 3874eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 3884688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* For a given PC, find the .so that it belongs to. 3901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Returns the base address of the .ARM.exidx section 3911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * for that .so, and the number of 8-byte entries 3921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * in that section (via *pcount). 3931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Intended to be called by libc's __gnu_Unwind_Find_exidx(). 3951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3963b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes * This function is exposed via dlfcn.cpp and libdl.so. 3971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 398faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 3991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned addr = (unsigned)pc; 4001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 401faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes for (soinfo* si = solist; si != 0; si = si->next) { 402468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich if ((addr >= si->base) && (addr < (si->base + si->size))) { 403468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich *pcount = si->ARM_exidx_count; 404f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee return (_Unwind_Ptr)si->ARM_exidx; 4051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 407faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes *pcount = 0; 4081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 4091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4104688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 41124053a461e7a20f34002262c1bb122023134989dChristopher Ferris#endif 4124688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Here, we only have to provide a callback to iterate across all the 4141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * loaded libraries. gcc_eh does the rest. */ 415faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesint dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) { 4161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int rv = 0; 417bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 418bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes dl_phdr_info dl_info; 4193a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_addr = si->link_map_head.l_addr; 4203a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_name = si->link_map_head.l_name; 4211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phdr = si->phdr; 4221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phnum = si->phnum; 423bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes rv = cb(&dl_info, sizeof(dl_phdr_info), data); 424bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (rv != 0) { 4251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 426bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 4271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return rv; 4291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4304688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4319419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanovstatic ElfW(Sym)* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) { 4320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 4330266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const char* strtab = si->strtab; 4341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4350266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", 4360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); 4371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { 4390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = symtab + n; 4400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (strcmp(strtab + s->st_name, name)) continue; 4411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4429419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov /* only concern ourselves with global and weak symbol definitions */ 4430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes switch (ELF_ST_BIND(s->st_info)) { 4440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_GLOBAL: 4450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_WEAK: 4460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (s->st_shndx == SHN_UNDEF) { 447d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov continue; 448d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov } 4491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 450d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", 4510266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(s->st_value), 4520266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<size_t>(s->st_size)); 453d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov return s; 454d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov case STB_LOCAL: 4559419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov continue; 456d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov default: 45712bf3bcdeeaa0dcdc7a4f4e4d11bc2fc3bf6bd7aDmitriy Ivanov __libc_fatal("ERROR: Unexpected ST_BIND value: %d for '%s' in '%s'", 45812bf3bcdeeaa0dcdc7a4f4e4d11bc2fc3bf6bd7aDmitriy Ivanov ELF_ST_BIND(s->st_info), name, si->name); 4591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 462db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov TRACE_TYPE(LOOKUP, "NOT FOUND %s in %s@%p %x %zd", 463db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); 464db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov 465db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov 4660266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return NULL; 4671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 469d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic unsigned elfhash(const char* _name) { 470faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const unsigned char* name = reinterpret_cast<const unsigned char*>(_name); 4711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned h = 0, g; 4721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 473faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes while (*name) { 4741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h = (h << 4) + *name++; 4751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project g = h & 0xf0000000; 4761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g; 4771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g >> 24; 4781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return h; 4801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4820266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, soinfo* needed[]) { 483943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan unsigned elf_hash = elfhash(name); 4840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 4856ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 486c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si != NULL && somain != NULL) { 4875ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel /* 488c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Local scope is executable scope. Just start looking into it right away 489c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * for the shortcut. 4905ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel */ 4915ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 492c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si == somain) { 4939419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov s = soinfo_elf_lookup(si, elf_hash, name); 4945ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 495c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 4965ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel goto done; 4975ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 49805e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov 49905e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov /* Next, look for it in the preloads list */ 50005e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov for (int i = 0; g_ld_preloads[i] != NULL; i++) { 50105e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name); 50205e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov if (s != NULL) { 50305e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov *lsi = g_ld_preloads[i]; 50405e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov goto done; 50505e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov } 50605e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov } 507c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } else { 508c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ 509c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 510c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 511c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with symbolic relocations disabled, the 512c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * first place to look to resolve external references is the main 513c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * executable. 514c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 515c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 516c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (!si->has_DT_SYMBOLIC) { 517ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s", 51861a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 5199419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov s = soinfo_elf_lookup(somain, elf_hash, name); 520c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 521c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 522c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 523c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 52405e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov 52505e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov /* Next, look for it in the preloads list */ 52605e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov for (int i = 0; g_ld_preloads[i] != NULL; i++) { 52705e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name); 52805e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov if (s != NULL) { 52905e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov *lsi = g_ld_preloads[i]; 53005e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov goto done; 53105e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov } 53205e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov } 533c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5345ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 535c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Look for symbols in the local scope (the object who is 5364eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes * searching). This happens with C++ templates on x86 for some 537c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * reason. 538c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * 539c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Notes on weak symbols: 540c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * The ELF specs are ambiguous about treatment of weak definitions in 541c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * dynamic linking. Some systems return the first definition found 542c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * and some the first non-weak definition. This is system dependent. 543c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Here we return the first definition found for simplicity. */ 544c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 5459419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov s = soinfo_elf_lookup(si, elf_hash, name); 546c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 547c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 548c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 549c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 550c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 551c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 552c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with -Bsymbolic and symbol is not found 553c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * in the local scope, try to find the symbol in the main executable. 554c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 555c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 556c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si->has_DT_SYMBOLIC) { 557ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s after local scope", 55861a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 5599419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov s = soinfo_elf_lookup(somain, elf_hash, name); 560c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 561c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 562c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 563c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5646ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 56505e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov /* Next, look for it in the preloads list */ 56605e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov for (int i = 0; g_ld_preloads[i] != NULL; i++) { 56705e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name); 56805e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov if (s != NULL) { 56905e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov *lsi = g_ld_preloads[i]; 57005e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov goto done; 57105e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov } 57205e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov } 57305e190c093ad5b04691ed87100a711ef91f380b0Dmitriy Ivanov } 5745ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5754fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 5764fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 577d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; needed[i] != NULL; i++) { 578ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in %s", 57961a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, needed[i]->name); 5809419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov s = soinfo_elf_lookup(needed[i], elf_hash, name); 5815ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 5825ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel *lsi = needed[i]; 58312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel goto done; 5845ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5856ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5866ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5876ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchevdone: 588d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 589c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " 590c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes "found in %s, base = %p, load bias = %p", 591c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->name, name, reinterpret_cast<void*>(s->st_value), 592c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), 593c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>((*lsi)->load_bias)); 5946ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev return s; 5956ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5966ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 597943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan return NULL; 5986ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev} 5996ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 600db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov// Another soinfo list allocator to use in dlsym. We don't reuse 601db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov// SoinfoListAllocator because it is write-protected most of the time. 602db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanovstatic LinkerAllocator<LinkedListEntry<soinfo>> g_soinfo_list_allocator_rw; 603db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanovclass SoinfoListAllocatorRW { 604db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov public: 605db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov static LinkedListEntry<soinfo>* alloc() { 606db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov return g_soinfo_list_allocator_rw.alloc(); 607db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov } 608422106a24d620af4be58e8d92a2e9b7b6167b72dDmitriy Ivanov 609db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov static void free(LinkedListEntry<soinfo>* ptr) { 610db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov g_soinfo_list_allocator_rw.free(ptr); 611db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov } 612db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov}; 613db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov 614db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov// This is used by dlsym(3). It performs symbol lookup only within the 615db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov// specified soinfo object and its dependencies in breadth first order. 6169419420919ea846bbad5510850c7aaec95021648Dmitriy IvanovElfW(Sym)* dlsym_handle_lookup(soinfo* si, soinfo** found, const char* name) { 617db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov LinkedList<soinfo, SoinfoListAllocatorRW> visit_list; 6188a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov LinkedList<soinfo, SoinfoListAllocatorRW> visited; 619db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov visit_list.push_back(si); 620db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov soinfo* current_soinfo; 621db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov while ((current_soinfo = visit_list.pop_front()) != nullptr) { 6228a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov if (visited.contains(current_soinfo)) { 6238a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov continue; 6248a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov } 6258a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov 6269419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov ElfW(Sym)* result = soinfo_elf_lookup(current_soinfo, elfhash(name), name); 627db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov 628db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov if (result != nullptr) { 629db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov *found = current_soinfo; 630db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov visit_list.clear(); 6318a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov visited.clear(); 632db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov return result; 633db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov } 6348a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov visited.push_back(current_soinfo); 635db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov 636db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov current_soinfo->get_children().for_each([&](soinfo* child) { 637db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov visit_list.push_back(child); 638db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov }); 639db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov } 640db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov 641db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov visit_list.clear(); 6428a84d383fb74135e928d341baa180c55854f2f42Dmitriy Ivanov visited.clear(); 643db7a17d4ff56a05af01ee2fee1f3c55245bfc630Dmitriy Ivanov return nullptr; 6441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 646d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3) to performs a global symbol lookup. If the 647d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom start value is null (for RTLD_DEFAULT), the search starts at the 648d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom beginning of the global solist. Otherwise the search starts at the 649d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom specified soinfo (for RTLD_NEXT). 6506ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 6519419420919ea846bbad5510850c7aaec95021648Dmitriy IvanovElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start) { 652cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes unsigned elf_hash = elfhash(name); 6531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 654cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (start == NULL) { 655cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes start = solist; 656cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6571698d9ebfc7e27271852a1fdf305a2ac37b3ebe4Matt Fischer 6580266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 659cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { 6609419420919ea846bbad5510850c7aaec95021648Dmitriy Ivanov s = soinfo_elf_lookup(si, elf_hash, name); 661cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 662cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes *found = si; 663cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes break; 6641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 665cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 667cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 668c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", 669c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); 670cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 672cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return s; 6731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 675fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Chengsoinfo* find_containing_library(const void* p) { 6760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) address = reinterpret_cast<ElfW(Addr)>(p); 677fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (soinfo* si = solist; si != NULL; si = si->next) { 678fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (address >= si->base && address - si->base < si->size) { 679fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return si; 680e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 681fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 682fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 683e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 684e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 6850266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dladdr_find_symbol(soinfo* si, const void* addr) { 6860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) soaddr = reinterpret_cast<ElfW(Addr)>(addr) - si->base; 687fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 688fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // Search the library's symbol table for any defined symbol which 689fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // contains this address. 690fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (size_t i = 0; i < si->nchain; ++i) { 6910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = &si->symtab[i]; 692fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (sym->st_shndx != SHN_UNDEF && 693fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr >= sym->st_value && 694fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr < sym->st_value + sym->st_size) { 695fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return sym; 696e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 697fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 698e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 699fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 700e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 701e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 702124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library_on_path(const char* name, const char* const paths[]) { 703124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes char buf[512]; 704124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes for (size_t i = 0; paths[i] != NULL; ++i) { 7051e980b6bc8315d00a07312b25486531247abd98cElliott Hughes int n = __libc_format_buffer(buf, sizeof(buf), "%s/%s", paths[i], name); 706124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (n < 0 || n >= static_cast<int>(sizeof(buf))) { 707ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); 708124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes continue; 7091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 710124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); 711124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd != -1) { 712124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 713124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 714124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 715124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return -1; 7161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 718124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library(const char* name) { 719ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ opening %s ]", name); 7201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 721124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // If the name contains a slash, we should attempt to open it directly and not search the paths. 722124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (strchr(name, '/') != NULL) { 7236971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); 7246971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes if (fd != -1) { 7256971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes return fd; 7266971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes } 7276971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. 7285ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#if defined(__LP64__) 729e43c4a7a665032a29cb5ec15d4adbf81ea199220Dmitriy Ivanov return -1; 7305ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#endif 731124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 7321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 733124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. 7341728b2396591853345507a063ed6075dfd251706Elliott Hughes int fd = open_library_on_path(name, g_ld_library_paths); 735124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd == -1) { 7361728b2396591853345507a063ed6075dfd251706Elliott Hughes fd = open_library_on_path(name, kDefaultLdPaths); 737124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 738124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 7391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 741b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* load_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { 74204dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov int fd = -1; 74304dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov ScopedFd file_guard(-1); 74404dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov 74504dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov if (extinfo != NULL && (extinfo->flags & ANDROID_DLEXT_USE_LIBRARY_FD) != 0) { 74604dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov fd = extinfo->library_fd; 74704dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov } else { 74804dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov // Open the file. 74904dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov fd = open_library(name); 75004dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov if (fd == -1) { 7514688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("library \"%s\" not found", name); 7521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 75304dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov } 75404dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov 75504dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov file_guard.reset(fd); 7562e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin } 7571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 758650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ElfReader elf_reader(name, fd); 759d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 760d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov struct stat file_stat; 761d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (TEMP_FAILURE_RETRY(fstat(fd, &file_stat)) != 0) { 762d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov DL_ERR("unable to stat file for the library %s: %s", name, strerror(errno)); 763d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return NULL; 764d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 765d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 766d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Check for symlink and other situations where 767d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // file can have different names. 768d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov for (soinfo* si = solist; si != NULL; si = si->next) { 769d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (si->get_st_dev() != 0 && 770d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_ino() != 0 && 771d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_dev() == file_stat.st_dev && 772d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_ino() == file_stat.st_ino) { 773d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("library \"%s\" is already loaded under different name/path \"%s\" - will return existing soinfo", name, si->name); 774d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return si; 775d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 776d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 777d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 778b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if ((dlflags & RTLD_NOLOAD) != 0) { 779b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov return NULL; 780b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 781b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 782d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Read the ELF header and load the segments. 78312bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) if (!elf_reader.Load(extinfo)) { 7844688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 78523363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 78623363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner 787489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov soinfo* si = soinfo_alloc(SEARCH_NAME(name), &file_stat); 788650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (si == NULL) { 7894688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 79023363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 791650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->base = elf_reader.load_start(); 792650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->size = elf_reader.load_size(); 793650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->load_bias = elf_reader.load_bias(); 794650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phnum = elf_reader.phdr_count(); 795650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phdr = elf_reader.loaded_phdr(); 796d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 797d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // At this point we know that whatever is loaded @ base is a valid ELF 798d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // shared library whose segments are properly mapped in. 79904dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov TRACE("[ load_library base=%p size=%zu name='%s' ]", 800d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov reinterpret_cast<void*>(si->base), si->size, si->name); 801d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 802d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (!soinfo_link_image(si, extinfo)) { 803d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo_free(si); 804d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return NULL; 805d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 806d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 807650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return si; 8081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 810489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanovstatic soinfo *find_loaded_library_by_name(const char* name) { 811489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov const char* search_name = SEARCH_NAME(name); 812489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov for (soinfo* si = solist; si != NULL; si = si->next) { 813489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov if (!strcmp(search_name, si->name)) { 814489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return si; 81512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 816489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov } 817489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return NULL; 81812c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel} 81912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 820b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* find_library_internal(const char* name, int dlflags, const android_dlextinfo* extinfo) { 821d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (name == NULL) { 822d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return somain; 823d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 824d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 825489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov soinfo* si = find_loaded_library_by_name(name); 826b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 827b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Library might still be loaded, the accurate detection 828b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // of this fact is done by load_library 829b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (si == NULL) { 830b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov TRACE("[ '%s' has not been found by name. Trying harder...]", name); 831b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov si = load_library(name, dlflags, extinfo); 832b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 833b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 834b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (si != NULL && (si->flags & FLAG_LINKED) == 0) { 835b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov DL_ERR("recursive link to \"%s\"", si->name); 836d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return NULL; 837d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 83812c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 839b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov return si; 840d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 841d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 842b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* find_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { 843b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* si = find_library_internal(name, dlflags, extinfo); 844d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 845ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count++; 846d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 847d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 848d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 849d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 850b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic void soinfo_unload(soinfo* si) { 851ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (si->ref_count == 1) { 852ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("unloading '%s'", si->name); 853d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallDestructors(); 854d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 855d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((si->flags | FLAG_NEW_SOINFO) != 0) { 856d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_children().for_each([&] (soinfo* child) { 857d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("%s needs to unload %s", si->name, child->name); 858d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo_unload(child); 859d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 860d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } else { 861d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 862d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (d->d_tag == DT_NEEDED) { 863d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov const char* library_name = si->strtab + d->d_un.d_val; 864d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("%s needs to unload %s", si->name, library_name); 865b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* needed = find_library(library_name, RTLD_NOLOAD, NULL); 866b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (needed != NULL) { 867b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo_unload(needed); 868b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } else { 869b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Not found: for example if symlink was deleted between dlopen and dlclose 870b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Since we cannot really handle errors at this point - print and continue. 871b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov PRINT("warning: couldn't find %s needed by %s on unload.", library_name, si->name); 872b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 873d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 874d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 8751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 8761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 877d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes notify_gdb_of_unload(si); 878ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 0; 879d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov soinfo_free(si); 880d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } else { 881ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count--; 882c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("not unloading '%s', decrementing ref_count to %zd", si->name, si->ref_count); 883d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 8841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 886a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesvoid do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 887172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris // Use basic string manipulation calls to avoid snprintf. 888172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris // snprintf indirectly calls pthread_getspecific to get the size of a buffer. 889172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris // When debug malloc is enabled, this call returns 0. This in turn causes 890172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris // snprintf to do nothing, which causes libraries to fail to load. 891172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris // See b/17302493 for further details. 892172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris // Once the above bug is fixed, this code can be modified to use 893172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris // snprintf again. 894172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris size_t required_len = strlen(kDefaultLdPaths[0]) + strlen(kDefaultLdPaths[1]) + 2; 895172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris if (buffer_size < required_len) { 896172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris __libc_fatal("android_get_LD_LIBRARY_PATH failed, buffer too small: buffer len %zu, required len %zu", 897172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris buffer_size, required_len); 898172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris } 899172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris char* end = stpcpy(buffer, kDefaultLdPaths[0]); 900172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris *end = ':'; 901172955a4e30b88ce8239a7ef426b4e8903e9923cChristopher Ferris strcpy(end + 1, kDefaultLdPaths[1]); 902a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes} 903a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 904cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesvoid do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 905cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (!get_AT_SECURE()) { 906cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_LD_LIBRARY_PATH(ld_library_path); 907cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 908cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 909cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 9101a586293400d0e1d73e6eb82f7dfe9d2d9ed3c4bElliott Hughessoinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) { 911b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL|RTLD_NOLOAD)) != 0) { 912e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes DL_ERR("invalid flags to dlopen: %x", flags); 913e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes return NULL; 914e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes } 915012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) { 9163a8646fc5d9f1a9304251a1d1c8ff9e523d81b40Dmitriy Ivanov DL_ERR("invalid extended flags to android_dlopen_ext: %" PRIx64, extinfo->flags); 917012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) return NULL; 918012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) } 919d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 920b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* si = find_library(name, flags, extinfo); 921d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 922d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 923d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 924d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 925d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 926d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 9271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 928b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovvoid do_dlclose(soinfo* si) { 929d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 930b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo_unload(si); 931d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 9321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 9331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 9344eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 9359918665a45095ad135576f005c0e5307feb366a1Chris Dearmanstatic int soinfo_relocate(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) { 9360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 937c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes soinfo* lsi; 938c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 939c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rela) { 9400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rela->r_info); 9410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rela->r_info); 9420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rela->r_offset + si->load_bias); 9430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 944faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 945c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 946c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 947c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (type == 0) { // R_*_NONE 948c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes continue; 949c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 950c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym != 0) { 951c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 952c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = soinfo_do_lookup(si, sym_name, &lsi, needed); 953c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (s == NULL) { 954c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We only allow an undefined symbol if this is a weak reference... 955c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 956c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 957c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 958c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 959c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 960c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 961c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes /* IHI0044C AAELF 4.5.1.1: 962c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 963c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Libraries are not searched to resolve weak references. 964c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes It is not an error for a weak reference to remain unsatisfied. 965c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 966c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes During linking, the value of an undefined weak reference is: 967c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - Zero if the relocation type is absolute 968c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of the place if the relocation is pc-relative 969c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of nominal base address if the relocation 970c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes type is base-relative. 971c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes */ 972c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 973c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 974e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 975e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 976e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 977e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 978e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 979e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 980e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 981e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 982e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * The sym_addr was initialized to be zero above, or the relocation 983e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * code below does not care about value of sym_addr. 984e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * No need to do anything. 985e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 986e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 987e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 988c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 989c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 990c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 991bb5bb2046fa0759d94995cbfb4f41137cd0b2a91Pavel Chupin case R_X86_64_64: 992c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 993c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // No need to do anything. 994c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 995c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 996c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_addr = reloc; 997c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 9984eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 999c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 1000faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rela, idx); 1001c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1002c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1003c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 1004c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We got a definition. 10050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 1006c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1007c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocSymbol); 1008c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 1009c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = NULL; 1010c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1011c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 1012c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 1013e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 1014e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 1015e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 1016e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10170266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %16llx <- %16llx %s\n", 10180266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 10190266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 1020e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1021e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 1022e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 1023e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %16llx <- %16llx %s\n", 10250266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 10260266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 1027e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1028e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 1029e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 1030e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10310266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS64 %16llx <- %16llx %s\n", 10320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 10330266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 1034e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1035e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 1036e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 1037e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS32 %16llx <- %16llx %s\n", 10390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 10400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 10410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 10420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 1043e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 10460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 10470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 1048e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1049e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1050e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1051e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 1052e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 1053e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS16 %16llx <- %16llx %s\n", 10550266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 10560266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 10570266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 10580266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 1059e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 10620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 10630266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 1064e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1065e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1066e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1067e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL64: 1068e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1069e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10700266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL64 %16llx <- %16llx - %16llx %s\n", 10710266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10720266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend) - rela->r_offset; 1073e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1074e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL32: 1075e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1076e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %16llx <- %16llx - %16llx %s\n", 10780266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10790266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 10800266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 10810266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1082e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 10850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 10860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 1087e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1088e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1089e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1090e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL16: 1091e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1092e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10930266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL16 %16llx <- %16llx - %16llx %s\n", 10940266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10950266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 10960266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 10970266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1098e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 11000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 11010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 11020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 1103e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1104e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1105e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1106e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1107e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 1108e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1109e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1110e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (sym) { 1111e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("odd RELATIVE form..."); 1112e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1113e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 11140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %16llx <- %16llx\n", 11150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (si->base + rela->r_addend)); 11160266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (si->base + rela->r_addend); 1117e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1118e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1119e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_COPY: 112076e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich /* 112176e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * ET_EXEC is not supported so this should not happen. 112276e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 112376e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 112476e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 112576e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 112676e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * R_AARCH64_COPY may only appear in executable objects where e_type is 112776e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * set to ET_EXEC. 112876e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich */ 112976e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich DL_ERR("%s R_AARCH64_COPY relocations are not supported", si->name); 113076e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich return -1; 1131e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_TPREL64: 11320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16llx <- %16llx - %16llx\n", 11330266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1134e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1135e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_DTPREL32: 11360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16llx <- %16llx - %16llx\n", 11370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1138e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1139e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 1140c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 1141c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1142c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1143c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1144c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 11450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1146c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1147c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 1148c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1149c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1150c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1151c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 11520266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1153c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1154c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 1155c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1156c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1157c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym) { 1158c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("odd RELATIVE form..."); 1159c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1160c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1161c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), 1162c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(si->base)); 11630266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = si->base + rela->r_addend; 1164c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1165c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 1166c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1167c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1168c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1169c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), sym_name); 11700266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1171c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1172c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin case R_X86_64_64: 1173c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin count_relocation(kRelocRelative); 1174c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin MARK(rela->r_offset); 1175c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1176c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin static_cast<size_t>(sym_addr), sym_name); 11770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1178c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin break; 1179c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 1180c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1181c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1182c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", 1183c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), 1184c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), static_cast<size_t>(reloc), sym_name); 11850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend - reloc; 1186c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 11874eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1188e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1189c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 1190faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rela, idx); 1191c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1192c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1193c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1194c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return 0; 1195c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes} 11969918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11979918665a45095ad135576f005c0e5307feb366a1Chris Dearman#else // REL, not RELA. 11989918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic int soinfo_relocate(soinfo* si, ElfW(Rel)* rel, unsigned count, soinfo* needed[]) { 12000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 1201d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 12021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 12034688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rel) { 12040266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rel->r_info); 12050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes // TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead. 12060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rel->r_info); 12070266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + si->load_bias); 12080266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 1209faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 12101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1211c620059479c47a78d57086d73726c9adc2f337adElliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 1212d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (type == 0) { // R_*_NONE 1213d7daacb46372132ae3f0121647074936c304b572Raghu Gandham continue; 1214d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1215d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (sym != 0) { 1216c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 12175ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1218d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s == NULL) { 12194eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We only allow an undefined symbol if this is a weak reference... 1220c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 1221c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 1222e9b6fc6f82276188404a2839e31a2f4c19f6c336Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 1223e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1224e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1225e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1226e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan /* IHI0044C AAELF 4.5.1.1: 1227e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1228e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan Libraries are not searched to resolve weak references. 1229e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan It is not an error for a weak reference to remain 1230e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan unsatisfied. 1231e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1232e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan During linking, the value of an undefined weak reference is: 1233e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - Zero if the relocation type is absolute 1234e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - The address of the place if the relocation is pc-relative 1235bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes - The address of nominal base address if the relocation 1236e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan type is base-relative. 1237e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan */ 1238e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1239e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan switch (type) { 12404eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1241e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_JUMP_SLOT: 1242e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_GLOB_DAT: 1243e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_ABS32: 1244e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_RELATIVE: /* Don't care. */ 12454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 12464eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 12474eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 12484eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12494eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 1250d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case R_386_JMP_SLOT: 1251e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_GLOB_DAT: 1252e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_32: 1253c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_386_RELATIVE: /* Don't care. */ 12544eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 12554eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 12564eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 1257e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 1258e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_PC32: 1259e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan sym_addr = reloc; 1260e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 12614eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1262e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 12634eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1264e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_COPY: 12654eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // Fall through. Can't really copy if weak symbol is not found at run-time. 12664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1267e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan default: 1268faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rel, idx); 1269e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1270e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1271e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } else { 12724eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We got a definition. 12730266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 1274d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1275bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocSymbol); 12761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1277e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan s = NULL; 12781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 12791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1280c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 12814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 12821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_JUMP_SLOT: 1283bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1285ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 12860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_GLOB_DAT: 1289bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1291ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 12920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_ABS32: 1295bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1297ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO ABS %08x <- %08x %s", reloc, sym_addr, sym_name); 12980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 130034ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner case R_ARM_REL32: 1301bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocRelative); 130234ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner MARK(rel->r_offset); 1303ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", 130434ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner reloc, sym_addr, rel->r_offset, sym_name); 13050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr - rel->r_offset; 130634ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner break; 13071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_COPY: 130876e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich /* 130976e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * ET_EXEC is not supported so this should not happen. 131076e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 131176e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 131276e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 131376e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 131476e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * R_ARM_COPY may only appear in executable objects where e_type is 131576e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * set to ET_EXEC. 131676e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich */ 131776e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich DL_ERR("%s R_ARM_COPY relocations are not supported", si->name); 131876e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich return -1; 13194eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 13204eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_JMP_SLOT: 13214eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13224eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13234eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 13240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 13254eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13264eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_GLOB_DAT: 13274eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13284eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13294eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 13300266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 13314eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13324eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_32: 13334eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13344eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13354eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_32 %08x <- +%08x %s", reloc, sym_addr, sym_name); 13360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 13374eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13384eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_PC32: 13394eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13404eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13414eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", 13424eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); 13430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr - reloc); 13444eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__mips__) 13464eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_MIPS_REL32: 13479918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__LP64__) 13489918665a45095ad135576f005c0e5307feb366a1Chris Dearman // MIPS Elf64_Rel entries contain compound relocations 13499918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case 13509918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || 13519918665a45095ad135576f005c0e5307feb366a1Chris Dearman ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { 1352faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)", 13539918665a45095ad135576f005c0e5307feb366a1Chris Dearman type, (unsigned)ELF64_R_TYPE2(rel->r_info), 1354faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (unsigned)ELF64_R_TYPE3(rel->r_info), rel, idx); 13559918665a45095ad135576f005c0e5307feb366a1Chris Dearman return -1; 13569918665a45095ad135576f005c0e5307feb366a1Chris Dearman } 13579918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 13584eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13594eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13609918665a45095ad135576f005c0e5307feb366a1Chris Dearman TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), 13619918665a45095ad135576f005c0e5307feb366a1Chris Dearman static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); 13624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (s) { 13630266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 13644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } else { 13650266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 13664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13674eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13684eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13694eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes 13704eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 13714eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_ARM_RELATIVE: 13724eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 13734eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_RELATIVE: 13744eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13764eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13774eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (sym) { 13784eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("odd RELATIVE form..."); 13794eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes return -1; 13804eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", 13824eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); 13830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 13844eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project default: 1387faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx); 13881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 13891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 13921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1393c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 13941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13954eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 139687c358524e479235aa6241736d2ce325f89daafcBrian Carlstromstatic bool mips_relocate_got(soinfo* si, soinfo* needed[]) { 13979918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Addr)** got = si->plt_got; 139887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (got == NULL) { 139987c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 140087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom } 140187c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned local_gotno = si->mips_local_gotno; 140287c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned gotsym = si->mips_gotsym; 140387c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned symtabno = si->mips_symtabno; 14040266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 1405d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 14069918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[0] is the address of the lazy resolver function. 14079918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[1] may be used for a GNU extension. 14089918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start). 14099918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: maybe this should be in a separate routine? 1410d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if ((si->flags & FLAG_LINKER) == 0) { 141187c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom size_t g = 0; 14129918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef); 14139918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (reinterpret_cast<intptr_t>(got[g]) < 0) { 14149918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed); 1415d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 14169918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Relocate the local GOT entries. 1417d7daacb46372132ae3f0121647074936c304b572Raghu Gandham for (; g < local_gotno; g++) { 14189918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + si->load_bias); 1419d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1420d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1421d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 14229918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Now for the global GOT entries... 14230266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = symtab + gotsym; 1424d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got = si->plt_got + local_gotno; 142587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { 14269918665a45095ad135576f005c0e5307feb366a1Chris Dearman // This is an undefined reference... try to locate it. 14279918665a45095ad135576f005c0e5307feb366a1Chris Dearman const char* sym_name = si->strtab + sym->st_name; 1428d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 14299918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1430d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (s == NULL) { 14319918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only allow an undefined symbol if this is a weak reference. 1432d7daacb46372132ae3f0121647074936c304b572Raghu Gandham s = &symtab[g]; 1433c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 14344688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot locate \"%s\"...", sym_name); 143587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return false; 1436d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1437d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *got = 0; 14389918665a45095ad135576f005c0e5307feb366a1Chris Dearman } else { 14399918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: is this sufficient? 14409918665a45095ad135576f005c0e5307feb366a1Chris Dearman // For reference see NetBSD link loader 14419918665a45095ad135576f005c0e5307feb366a1Chris Dearman // http://cvsweb.netbsd.org/bsdweb.cgi/src/libexec/ld.elf_so/arch/mips/mips_reloc.c?rev=1.53&content-type=text/x-cvsweb-markup 14429918665a45095ad135576f005c0e5307feb366a1Chris Dearman *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value); 1443d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1444d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 144587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 1446d7daacb46372132ae3f0121647074936c304b572Raghu Gandham} 1447d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1448d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1449812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallArray(const char* array_name __unused, linker_function_t* functions, size_t count, bool reverse) { 1450ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (functions == NULL) { 1451d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1452d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14538215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1454c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("[ Calling %s (size %zd) @ %p for '%s' ]", array_name, count, functions, name); 14558215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1456ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int begin = reverse ? (count - 1) : 0; 1457ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int end = reverse ? -1 : count; 1458ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int step = reverse ? -1 : 1; 14598215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1460ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (int i = begin; i != end; i += step) { 1461ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); 1462ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes CallFunction("function", functions[i]); 1463d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1464d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1465ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s for '%s' ]", array_name, name); 14661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 14671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1468812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallFunction(const char* function_name __unused, linker_function_t function) { 1469db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) { 1470d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1471d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1472d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1473ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); 1474d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes function(); 1475ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); 1476db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes 1477db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures 1478db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // are still writable. This happens with our debug malloc (see http://b/7941716). 1479d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 14809181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov} 14819181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 1482d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallPreInitConstructors() { 14838147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_PREINIT_ARRAY functions are called before any other constructors for executables, 14848147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // but ignored in a shared library. 1485d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); 1486d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 1487e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1488d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallConstructors() { 1489d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (constructors_called) { 1490d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1491d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1492e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1493d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // We set constructors_called before actually calling the constructors, otherwise it doesn't 1494d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // protect against recursive constructor calls. One simple example of constructor recursion 1495d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: 1496d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 1. The program depends on libc, so libc's constructor is called here. 1497d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. 1498d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 3. dlopen() calls the constructors on the newly created 1499d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // soinfo for libc_malloc_debug_leak.so. 1500d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 4. The debug .so depends on libc, so CallConstructors is 1501d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // called again with the libc soinfo. If it doesn't trigger the early- 1502d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // out above, the libc constructor will be called again (recursively!). 1503d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes constructors_called = true; 1504d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 15058147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { 15068147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // The GNU dynamic linker silently ignores these, but we warn the developer. 1507c620059479c47a78d57086d73726c9adc2f337adElliott Hughes PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", 15088147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes name, preinit_array_count); 1509d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 15101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1511d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov get_children().for_each([] (soinfo* si) { 1512d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->CallConstructors(); 1513d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 15141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15158147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors", name); 15168147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15178147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_INIT should be called before DT_INIT_ARRAY if both are present. 1518d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_INIT", init_func); 1519d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); 1520e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov} 15218215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1522d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallDestructors() { 15238147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling destructors", name); 15248147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15258147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI_ARRAY must be parsed in reverse order. 1526d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); 15278147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15288147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI should be called after DT_FINI_ARRAY if both are present. 1529d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_FINI", fini_func); 1530b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 1531b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // This is needed on second call to dlopen 1532b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // after library has been unloaded with RTLD_NODELETE 1533b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov constructors_called = false; 15341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 15351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1536d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::add_child(soinfo* child) { 1537d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1538d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1539d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1540d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1541d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov this->children.push_front(child); 1542d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov child->parents.push_front(this); 1543d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1544d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1545d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::remove_all_links() { 1546d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1547d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1548d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1549d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1550d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // 1. Untie connected soinfos from 'this'. 1551d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov children.for_each([&] (soinfo* child) { 1552d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov child->parents.remove_if([&] (const soinfo* parent) { 1553d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return parent == this; 1554d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1555d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1556d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1557d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parents.for_each([&] (soinfo* parent) { 1558d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parent->children.for_each([&] (const soinfo* child) { 1559d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return child == this; 1560d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1561d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1562d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1563d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // 2. Once everything untied - clear local lists. 1564d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parents.clear(); 1565d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov children.clear(); 1566d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1567d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1568d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::set_st_dev(dev_t dev) { 1569d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1570d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1571d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1572d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1573d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov st_dev = dev; 1574d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1575d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1576d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::set_st_ino(ino_t ino) { 1577d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1578d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1579d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1580d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1581d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov st_ino = ino; 1582d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1583d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1584d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovdev_t soinfo::get_st_dev() { 1585d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1586d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return 0; 1587d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1588d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1589d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return st_dev; 1590d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov}; 1591d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1592d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovino_t soinfo::get_st_ino() { 1593d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1594d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return 0; 1595d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1596d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1597d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return st_ino; 1598d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1599d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1600d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov// This is a return on get_children() in case 1601d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov// 'this->flags' does not have FLAG_NEW_SOINFO set. 1602d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo::soinfo_list_t g_empty_list; 1603d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1604d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovsoinfo::soinfo_list_t& soinfo::get_children() { 1605d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1606d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return g_empty_list; 1607d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1608d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1609d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return this->children; 1610d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1611d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 16121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Force any of the closed stdin, stdout and stderr to be associated with 16131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /dev/null. */ 16145419b9474753d25dff947c7740532f86d130c0beElliott Hughesstatic int nullify_closed_stdio() { 16151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int dev_null, i, status; 16161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int return_value = 0; 16171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 161816084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR)); 16191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null < 0) { 16204688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot open /dev/null: %s", strerror(errno)); 16211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 16221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1623ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); 16241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If any of the stdio file descriptors is valid and not associated 16261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project with /dev/null, dup /dev/null to it. */ 16271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for (i = 0; i < 3; i++) { 16281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If it is /dev/null already, we are done. */ 16294688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (i == dev_null) { 16301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16314688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 16321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1633ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Nullifying stdio file descriptor %d]", i); 16344688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); 16351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16364688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes /* If file is opened, we are good. */ 16374688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status != -1) { 16384688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes continue; 16394688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 16401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* The only error we allow is that the file descriptor does not 16421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project exist, in which case we dup /dev/null to it. */ 16431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (errno != EBADF) { 16444688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("fcntl failed: %s", strerror(errno)); 16451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Try dupping /dev/null to this stdio file descriptor and 16501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project repeat if there is a signal. Note that any errors in closing 16511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project the stdio descriptor are lost. */ 16524688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); 16531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (status < 0) { 16544688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("dup2 failed: %s", strerror(errno)); 16551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If /dev/null is not one of the stdio file descriptors, close it. */ 16611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null > 2) { 1662ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); 16634688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(close(dev_null)); 16644688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status == -1) { 16654688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("close failed: %s", strerror(errno)); 16661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return return_value; 16711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 16721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1673183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo) { 1674f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee /* "base" might wrap around UINT32_MAX. */ 16750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) base = si->load_bias; 16760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr = si->phdr; 16771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int phnum = si->phnum; 1678d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom bool relocating_linker = (si->flags & FLAG_LINKER) != 0; 16791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1680b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can't debug anything until the linker is relocated */ 1681b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1682ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ linking %s ]", si->name); 1683c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p si->flags = 0x%08x", reinterpret_cast<void*>(si->base), si->flags); 1684b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 16851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 168663f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner /* Extract dynamic section */ 1687124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes size_t dynamic_count; 16880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Word) dynamic_flags; 168912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, 1690cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman &dynamic_count, &dynamic_flags); 169163f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner if (si->dynamic == NULL) { 1692b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1693124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); 1694b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 1695124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 169663f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } else { 1697b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1698ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("dynamic = %p", si->dynamic); 1699b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 170063f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } 170163f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 17024eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 170363f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner (void) phdr_table_get_arm_exidx(phdr, phnum, base, 170463f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner &si->ARM_exidx, &si->ARM_exidx_count); 170563f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner#endif 170663f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 17078147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // Extract useful information from dynamic section. 1708d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom uint32_t needed_count = 0; 17090266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1710c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", 1711c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1712c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (d->d_tag) { 17131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_HASH: 1714faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nbucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[0]; 1715faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nchain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[1]; 1716faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->bucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8); 1717faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->chain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8 + si->nbucket * 4); 17181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_STRTAB: 1720faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->strtab = reinterpret_cast<const char*>(base + d->d_un.d_ptr); 17211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_SYMTAB: 1723faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->symtab = reinterpret_cast<ElfW(Sym)*>(base + d->d_un.d_ptr); 17241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17254eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if !defined(__LP64__) 17261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTREL: 1727d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val != DT_REL) { 1728124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1729124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 17301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1732c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_JMPREL: 17344eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1735faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1736c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1737faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1738c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTRELSZ: 17414eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 17420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1743c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 17440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1745c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17479918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__mips__) 17481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTGOT: 17499918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Used by mips and mips64. 17509918665a45095ad135576f005c0e5307feb366a1Chris Dearman si->plt_got = reinterpret_cast<ElfW(Addr)**>(base + d->d_un.d_ptr); 17511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1752c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_DEBUG: 1754bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_DEBUG entry to the address of _r_debug for GDB 1755cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman // if the dynamic table is writable 17569918665a45095ad135576f005c0e5307feb366a1Chris Dearman// FIXME: not working currently for N64 17579918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The flags for the LOAD and DYNAMIC program headers do not agree. 17589918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The LOAD section containng the dynamic table has been mapped as 17599918665a45095ad135576f005c0e5307feb366a1Chris Dearman// read-only, but the DYNAMIC header claims it is writable. 17609918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if !(defined(__mips__) && defined(__LP64__)) 176199c32055cb50443f722c55914869c1f6bb941959Elliott Hughes if ((dynamic_flags & PF_W) != 0) { 1762c620059479c47a78d57086d73726c9adc2f337adElliott Hughes d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); 176399c32055cb50443f722c55914869c1f6bb941959Elliott Hughes } 17641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17659918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 17664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1767c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELA: 1768faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1769c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1770c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELASZ: 17710266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1772c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1773c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1774c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_REL in \"%s\"", si->name); 1775c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1776c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 1777c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); 1778c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1779c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1780c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1781faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1782c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1783c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 17840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1785c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1786ad13c57298e57d33c130fb03a2c6494da573408cShin-ichiro KAWASAKI case DT_RELA: 1787124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1788124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1789c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT: 1791ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17928147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT) found at %p", si->name, si->init_func); 17931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI: 1795ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17968147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI) found at %p", si->name, si->fini_func); 17971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAY: 1799ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 18008147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT_ARRAY) found at %p", si->name, si->init_array); 18011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAYSZ: 18030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->init_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 18041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAY: 1806ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 18078147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI_ARRAY) found at %p", si->name, si->fini_array); 18081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAYSZ: 18100266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->fini_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 18111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAY: 1813ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->preinit_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 18148147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_PREINIT_ARRAY) found at %p", si->name, si->preinit_array); 18151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAYSZ: 18170266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 18181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_TEXTREL: 1820e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1821e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1822e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1823e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 18245135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->has_text_relocations = true; 18251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1826e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18275ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_SYMBOLIC: 18285ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 18295ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 1830d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom case DT_NEEDED: 1831d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom ++needed_count; 1832d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom break; 18335ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_FLAGS: 1834d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_TEXTREL) { 1835e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1836e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1837e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1838e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 18395ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_text_relocations = true; 1840e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18415ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 1842d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_SYMBOLIC) { 18435ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 18445ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 18455ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 18464eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 1847d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_STRSZ: 1848d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_SYMENT: 1849d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_RELENT: 1850d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1851d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_MAP: 1852bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB. 1853d7daacb46372132ae3f0121647074936c304b572Raghu Gandham { 1854006f9ad8910c945cd50e54f6c34d8c27b11c1193Benjamin Adolphi r_debug** dp = reinterpret_cast<r_debug**>(base + d->d_un.d_ptr); 1855d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *dp = &_r_debug; 1856d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1857d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1858d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_VERSION: 1859d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_FLAGS: 1860d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_BASE_ADDRESS: 1861d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_UNREFEXTNO: 1862d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1863d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1864d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_SYMTABNO: 1865d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_symtabno = d->d_un.d_val; 1866d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1867d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1868d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_LOCAL_GOTNO: 1869d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_local_gotno = d->d_un.d_val; 1870d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1871d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1872d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_GOTSYM: 1873d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_gotsym = d->d_un.d_val; 1874d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1876d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1877d7daacb46372132ae3f0121647074936c304b572Raghu Gandham default: 18784eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DEBUG("Unused DT entry: type %p arg %p", 18794eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1880d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1884c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", 1885c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->strtab, si->symtab); 18861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1887124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Sanity checks. 1888d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (relocating_linker && needed_count != 0) { 1889d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); 1890d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom return false; 1891d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 1892124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->nbucket == 0) { 1893124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); 1894124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1895124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1896124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->strtab == 0) { 1897124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); 1898124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1899124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1900124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->symtab == 0) { 1901124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); 1902124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 19041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19057e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // If this is the main executable, then load all of the libraries from LD_PRELOAD now. 1906d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_EXE) { 19071728b2396591853345507a063ed6075dfd251706Elliott Hughes memset(g_ld_preloads, 0, sizeof(g_ld_preloads)); 19087e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes size_t preload_count = 0; 19091728b2396591853345507a063ed6075dfd251706Elliott Hughes for (size_t i = 0; g_ld_preload_names[i] != NULL; i++) { 1910b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* lsi = find_library(g_ld_preload_names[i], 0, NULL); 19117e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes if (lsi != NULL) { 19121728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads[preload_count++] = lsi; 19137e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes } else { 19147e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // As with glibc, failure to load an LD_PRELOAD library is just a warning. 19157e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", 19161728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preload_names[i], si->name, linker_get_error_buffer()); 19174fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 19184fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 19194fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 19204fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1921faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes soinfo** needed = reinterpret_cast<soinfo**>(alloca((1 + needed_count) * sizeof(soinfo*))); 1922d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo** pneeded = needed; 192312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 19240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1925d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1926d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 1927ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s needs %s", si->name, library_name); 1928b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* lsi = find_library(library_name, 0, NULL); 1929d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (lsi == NULL) { 1930650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); 19314688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("could not load library \"%s\" needed by \"%s\"; caused by %s", 1932d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom library_name, si->name, tmp_err_buf); 1933124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1935d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1936d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->add_child(lsi); 193712c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded++ = lsi; 19381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 19391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 194012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded = NULL; 19411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1942e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 19435135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1944e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // Make segments writable to allow text relocations to work properly. We will later call 1945e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // phdr_table_protect_segments() after all of them are applied and all constructors are run. 19463d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich DL_WARN("%s has text relocations. This is wasting memory and prevents " 19473d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich "security hardening. Please fix.", si->name); 19485135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 19495135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't unprotect loadable segments for \"%s\": %s", 19505135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1951124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19525135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 19535135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 1954e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 19555135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich 19564eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1957c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->plt_rela != NULL) { 1958faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]\n", si->name); 19599918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) { 1960c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1961c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1962c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1963c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->rela != NULL) { 1964faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]\n", si->name); 19659918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->rela, si->rela_count, needed)) { 1966c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1967c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1968c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1969c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1970d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->plt_rel != NULL) { 1971faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]", si->name); 1972d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { 1973124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1974124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1976d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->rel != NULL) { 1977faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]", si->name); 1978d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { 1979124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1980124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1982c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 19831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19844eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 198587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (!mips_relocate_got(si, needed)) { 1986124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1987d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1988d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1989d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 19901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_LINKED; 1991ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ finished linking %s ]", si->name); 19921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1993e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 19945135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1995e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // All relocations are done, we can protect our segments back to read-only. 19965135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 19975135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't protect segments for \"%s\": %s", 19985135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1999124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 20005135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 20011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2002e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 20031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2004b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can also turn on GNU RELRO protection */ 2005b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) { 20064688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", 20074688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes si->name, strerror(errno)); 2008124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 20099ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich } 20109ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich 2011183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) /* Handle serializing/sharing the RELRO segment */ 2012183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (extinfo && (extinfo->flags & ANDROID_DLEXT_WRITE_RELRO)) { 2013183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_serialize_gnu_relro(si->phdr, si->phnum, si->load_bias, 2014183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 2015183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed serializing GNU RELRO section for \"%s\": %s", 2016183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 2017183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 2018183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 2019183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } else if (extinfo && (extinfo->flags & ANDROID_DLEXT_USE_RELRO)) { 2020183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_map_gnu_relro(si->phdr, si->phnum, si->load_bias, 2021183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 2022183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed mapping GNU RELRO section for \"%s\": %s", 2023183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 2024183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 2025183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 2026183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 2027183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 20281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project notify_gdb_of_load(si); 2029124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return true; 20301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 20311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2032468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2033c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * This function add vdso to internal dso list. 2034c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * It helps to stack unwinding through signal handlers. 2035c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * Also, it makes bionic more like glibc. 2036c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov */ 2037812fd4263a005b88f3b4222baa910114f938d594Kito Chengstatic void add_vdso(KernelArgumentBlock& args __unused) { 20384eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(AT_SYSINFO_EHDR) 20390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(args.getauxval(AT_SYSINFO_EHDR)); 20400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (ehdr_vdso == NULL) { 20410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return; 20420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 2043c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2044d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo* si = soinfo_alloc("[vdso]", NULL); 2045ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 20460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); 20470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phnum = ehdr_vdso->e_phnum; 20480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(ehdr_vdso); 20490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->size = phdr_table_get_load_size(si->phdr, si->phnum); 20500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = get_elf_exec_load_bias(ehdr_vdso); 2051ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 20520dcf06f976670b5d05286b184d150f61b71c1184Torne (Richard Coles) soinfo_link_image(si, NULL); 2053c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov#endif 2054c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov} 2055c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2056c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov/* 2057d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * This is linker soinfo for GDB. See details below. 2058d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2059d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo linker_soinfo_for_gdb; 2060d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2061d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov/* gdb expects the linker to be in the debug shared object list. 2062d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Without this, gdb has trouble locating the linker's ".text" 2063d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * and ".plt" sections. Gdb could also potentially use this to 2064d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * relocate the offset of our exported 'rtld_db_dlactivity' symbol. 2065d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Don't use soinfo_alloc(), because the linker shouldn't 2066d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * be on the soinfo list. 2067d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2068d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic void init_linker_info_for_gdb(ElfW(Addr) linker_base) { 2069d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#if defined(__LP64__) 2070d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker64", sizeof(linker_soinfo_for_gdb.name)); 2071d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#else 2072d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker", sizeof(linker_soinfo_for_gdb.name)); 2073d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#endif 2074d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov linker_soinfo_for_gdb.flags = FLAG_NEW_SOINFO; 2075d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov linker_soinfo_for_gdb.base = linker_base; 2076d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2077d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov /* 2078d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Set the dynamic field in the link map otherwise gdb will complain with 2079d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * the following: 2080d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * warning: .dynamic section for "/system/bin/linker" is not at the 2081d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * expected address (wrong library or version mismatch?) 2082d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2083d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_base); 2084d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_base + elf_hdr->e_phoff); 2085d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, 2086d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov &linker_soinfo_for_gdb.dynamic, NULL, NULL); 2087d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov insert_soinfo_into_debug_map(&linker_soinfo_for_gdb); 2088d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 2089d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2090d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov/* 2091468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This code is called after the linker has linked itself and 2092468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * fixed it's own GOT. It is safe to make references to externs 2093468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * and other non-local data at this point. 2094468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 20950266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(Addr) linker_base) { 209642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes /* NOTE: we store the args pointer on a special location 2097ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * of the temporary TLS area in order to pass it to 2098ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * the C Library's runtime initializer. 2099ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * 2100ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * The initializer must clear the slot and reset the TLS 2101ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * to point to a different location to ensure that no other 2102ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * shared library constructor can access it. 2103ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner */ 2104d3920b3a996b358e48232f417aa0a1e44a60f155Elliott Hughes __libc_init_tls(args); 21051a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov 21061a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#if TIMING 21071a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov struct timeval t0, t1; 21081a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov gettimeofday(&t0, 0); 21091a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#endif 21101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 211118a206c81d9743481e364384affd43306911283dElliott Hughes // Initialize environment functions, and get to the ELF aux vectors table. 211242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_env_init(args); 2113be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 21148d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // If this is a setuid/setgid program, close the security hole described in 21158d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc 21168d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich if (get_AT_SECURE()) { 21178d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich nullify_closed_stdio(); 21188d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich } 21198d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich 2120d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom debuggerd_init(); 21211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 212218a206c81d9743481e364384affd43306911283dElliott Hughes // Get a few environment variables. 212361a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes const char* LD_DEBUG = linker_env_get("LD_DEBUG"); 212461a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes if (LD_DEBUG != NULL) { 21251728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_debug_verbosity = atoi(LD_DEBUG); 212618a206c81d9743481e364384affd43306911283dElliott Hughes } 2127be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 212818a206c81d9743481e364384affd43306911283dElliott Hughes // Normally, these are cleaned by linker_env_init, but the test 212918a206c81d9743481e364384affd43306911283dElliott Hughes // doesn't cost us anything. 213018a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpath_env = NULL; 213118a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpreload_env = NULL; 213218a206c81d9743481e364384affd43306911283dElliott Hughes if (!get_AT_SECURE()) { 213318a206c81d9743481e364384affd43306911283dElliott Hughes ldpath_env = linker_env_get("LD_LIBRARY_PATH"); 213418a206c81d9743481e364384affd43306911283dElliott Hughes ldpreload_env = linker_env_get("LD_PRELOAD"); 21351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2137ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ android linker & debugger ]"); 21381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2139d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo* si = soinfo_alloc(args.argv[0], NULL); 214018a206c81d9743481e364384affd43306911283dElliott Hughes if (si == NULL) { 214118a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 21421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2144d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* bootstrap the link map, the main exe always needs to be first */ 21451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_EXE; 21463a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(si->link_map_head); 21471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_addr = 0; 214942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes map->l_name = args.argv[0]; 21501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = NULL; 21511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = NULL; 21521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 21541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 21551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2156d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov init_linker_info_for_gdb(linker_base); 21571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 215842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Extract information passed from the kernel. 21590266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(args.getauxval(AT_PHDR)); 216042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->phnum = args.getauxval(AT_PHNUM); 216142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->entry = args.getauxval(AT_ENTRY); 21621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21638180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner /* Compute the value of si->base. We can't rely on the fact that 21648180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * the first entry is the PHDR because this will not be true 21658180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * for certain executables (e.g. some in the NDK unit test suite) 21668180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner */ 21678180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner si->base = 0; 2168b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner si->size = phdr_table_get_load_size(si->phdr, si->phnum); 2169bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner si->load_bias = 0; 2170ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (size_t i = 0; i < si->phnum; ++i) { 217142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes if (si->phdr[i].p_type == PT_PHDR) { 21720266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_vaddr; 21730266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_offset; 217442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes break; 217542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 21768180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner } 2177d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->dynamic = NULL; 2178ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 1; 21791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21802aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base); 21812aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich if (elf_hdr->e_type != ET_DYN) { 21822aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n"); 21832aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich exit(EXIT_FAILURE); 21842aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich } 21852aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich 21864688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). 21874688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_LIBRARY_PATH(ldpath_env); 21884688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_PRELOAD(ldpreload_env); 21894fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 21905ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel somain = si; 21915ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 2192183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(si, NULL)) { 2193650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer()); 219418a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 21951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2197c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov add_vdso(args); 2198c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2199d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallPreInitConstructors(); 22009181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 22011728b2396591853345507a063ed6075dfd251706Elliott Hughes for (size_t i = 0; g_ld_preloads[i] != NULL; ++i) { 22021728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads[i]->CallConstructors(); 2203326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng } 2204326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng 2205d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* After the link_image, the si->load_bias is initialized. 2206d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * For so lib, the map->l_addr will be updated in notify_gdb_of_load. 2207d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * We need to update this value for so exe here. So Unwind_Backtrace 2208d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * for some arch like x86 could work correctly within so exe. 22099c3449ecd9d5e9cdb1e995e35e53334a4a288a5eXiaokang Qin */ 2210c5db969aa4a24a76fc0964f2ff89533e832b47a6Chao-Ying Fu map->l_addr = si->load_bias; 2211d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 2212e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 22131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING 2214faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes gettimeofday(&t1, NULL); 2215ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("LINKER TIME: %s: %d microseconds", args.argv[0], (int) ( 22161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - 2217faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec))); 22181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 2220ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol", args.argv[0], 2221bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocAbsolute], 2222bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocRelative], 2223bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocCopy], 2224bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocSymbol]); 22251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 22271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project { 22281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 22291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned i; 22301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = 0; 2231d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (n = 0; n < 4096; n++) { 2232d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (bitmask[n]) { 22331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned x = bitmask[n]; 2234e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 2235e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland for (i = 0; i < 32; i++) { 2236e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 2237d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (i = 0; i < 8; i++) { 2238e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 2239d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (x & 1) { 2240d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom count++; 2241d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 22421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project x >>= 1; 22431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 22441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 22451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2246ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("PAGES MODIFIED: %s: %d (%dKB)", args.argv[0], count, count * 4); 22471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 22481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 22501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING || STATS || COUNT_PAGES 22511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fflush(stdout); 22521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2254c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE("[ Ready to execute '%s' @ %p ]", si->name, reinterpret_cast<void*>(si->entry)); 22551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return si->entry; 22561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2257468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 2258bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner/* Compute the load-bias of an existing executable. This shall only 2259bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * be used to compute the load bias of an executable or shared library 2260bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * that was loaded by the kernel itself. 2261bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * 2262bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Input: 2263bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * elf -> address of ELF header, assumed to be at the start of the file. 2264bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Return: 2265bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * load bias, i.e. add the value of any p_vaddr in the file to get 2266bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * the corresponding address in memory. 2267bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner */ 22680266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) { 22690266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) offset = elf->e_phoff; 2270faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const ElfW(Phdr)* phdr_table = reinterpret_cast<const ElfW(Phdr)*>(reinterpret_cast<uintptr_t>(elf) + offset); 22710266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr_end = phdr_table + elf->e_phnum; 2272fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 22730266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (const ElfW(Phdr)* phdr = phdr_table; phdr < phdr_end; phdr++) { 2274fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (phdr->p_type == PT_LOAD) { 22750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return reinterpret_cast<ElfW(Addr)>(elf) + phdr->p_offset - phdr->p_vaddr; 2276bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner } 2277fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 2278fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return 0; 2279bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner} 2280bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner 22815febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanovextern "C" void _start(); 22825febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov 2283468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2284468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This is the entry point for the linker, called from begin.S. This 2285468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * method is responsible for fixing the linker's own relocations, and 2286468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * then calling __linker_init_post_relocation(). 2287468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * 2288468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * Because this method is called before the linker has fixed it's own 2289468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * relocations, any attempt to reference an extern variable, extern 2290468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * function, or other GOT reference will generate a segfault. 2291468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 22920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesextern "C" ElfW(Addr) __linker_init(void* raw_args) { 2293d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Initialize static variables. 2294d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov solist = get_libdl_info(); 2295d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov sonext = get_libdl_info(); 2296d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 229742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes KernelArgumentBlock args(raw_args); 229842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 22990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) linker_addr = args.getauxval(AT_BASE); 23005febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov ElfW(Addr) entry_point = args.getauxval(AT_ENTRY); 23010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr); 2302faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff); 230342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 230442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo linker_so; 230542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes memset(&linker_so, 0, sizeof(soinfo)); 230642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 23075febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov // If the linker is not acting as PT_INTERP entry_point is equal to 23085febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov // _start. Which means that the linker is running as an executable and 23095febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov // already linked by PT_INTERP. 23105febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov // 23115febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov // This happens when user tries to run 'adb shell /system/bin/linker' 23125febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov // see also https://code.google.com/p/android/issues/detail?id=63174 23135febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov if (reinterpret_cast<ElfW(Addr)>(&_start) == entry_point) { 23145febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov __libc_fatal("This is %s, the helper program for shared library executables.\n", args.argv[0]); 23155febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov } 23165febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov 2317b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes strcpy(linker_so.name, "[dynamic linker]"); 231842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.base = linker_addr; 231942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); 232042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); 2321d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_so.dynamic = NULL; 232242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phdr = phdr; 232342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phnum = elf_hdr->e_phnum; 232442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.flags |= FLAG_LINKER; 232542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2326183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(&linker_so, NULL)) { 232742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // It would be nice to print an error message, but if the linker 232842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // can't link itself, there's no guarantee that we'll be able to 2329b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // call write() (because it involves a GOT reference). We may as 2330b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // well try though... 2331b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes const char* msg = "CANNOT LINK EXECUTABLE: "; 2332b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, msg, strlen(msg)); 2333b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); 2334b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, "\n", 1); 2335b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes _exit(EXIT_FAILURE); 233642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 2337468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 23385febb0da6f6d7106c403e6809917d89d6ee081adDmitriy Ivanov // Initialize the linker's own global variables 233965549969488bbce7f5d1b57714ba32c466943470Dmitriy Ivanov linker_so.CallConstructors(); 234065549969488bbce7f5d1b57714ba32c466943470Dmitriy Ivanov 234142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // We have successfully fixed our own relocations. It's safe to run 234242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // the main part of the linker now. 23431728b2396591853345507a063ed6075dfd251706Elliott Hughes args.abort_message_ptr = &g_abort_message; 23440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) start_address = __linker_init_post_relocation(args, linker_addr); 23455419b9474753d25dff947c7740532f86d130c0beElliott Hughes 2346d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 2347d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 234842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Return the address that the calling assembly stub should jump to. 234942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes return start_address; 2350468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich} 2351