linker.cpp revision e43c4a7a665032a29cb5ec15d4adbf81ea199220
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" 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker.h" 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker_debug.h" 48be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner#include "linker_environ.h" 4923363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner#include "linker_phdr.h" 50d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov#include "linker_allocator.h" 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Do NOT use malloc() and friends or pthread_*() code here. 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Don't use printf() either; it's caused mysterious memory 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * corruption in the past. 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The linker runs before we bring up libc and it's easiest 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * to make sure it does not depend on any complex libc features 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * open issues / todo: 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 62d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * - are we doing everything we should for ARM_COPY relocations? 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 { \ 1664688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes const char* msg = "ERROR: " #name " called from the dynamic linker!\n"; \ 1678f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes __libc_format_log(ANDROID_LOG_FATAL, "linker", "%s", msg); \ 1688f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes write(2, msg, strlen(msg)); \ 1698f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes abort(); \ 1704688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 171812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, malloc, (size_t u __unused)); 172812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void, free, (void* u __unused)); 173812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, realloc, (void* u1 __unused, size_t u2 __unused)); 174812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, calloc, (size_t u1 __unused, size_t u2 __unused)); 1752e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 1760353195f344666256dba474a15c9ba22cf0cccc9Dima Zavinstatic char tmp_err_buf[768]; 1772e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavinstatic char __linker_dl_err_buf[768]; 1782e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 179650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hugheschar* linker_get_error_buffer() { 1805419b9474753d25dff947c7740532f86d130c0beElliott Hughes return &__linker_dl_err_buf[0]; 1812e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin} 1822e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 183650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughessize_t linker_get_error_buffer_size() { 184650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return sizeof(__linker_dl_err_buf); 185650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes} 186650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 1871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 1881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This function is an empty stub where GDB locates a breakpoint to get notified 1891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about linker activity. 1901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 1915419b9474753d25dff947c7740532f86d130c0beElliott Hughesextern "C" void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity(); 1921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1931728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic pthread_mutex_t g__r_debug_mutex = PTHREAD_MUTEX_INITIALIZER; 1943a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic r_debug _r_debug = {1, NULL, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0}; 1953a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic link_map* r_debug_tail = 0; 1961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1973a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic void insert_soinfo_into_debug_map(soinfo* info) { 198bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Copy the necessary fields into the debug structure. 1993a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 200ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov map->l_addr = info->load_bias; 201faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes map->l_name = reinterpret_cast<char*>(info->name); 2023a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes map->l_ld = info->dynamic; 2031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Stick the new library at the end of the list. 2051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * gdb tends to care more about libc than it does 2061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about leaf libraries, and ordering it this way 2071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * reduces the back-and-forth over the wire. 2081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 2091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (r_debug_tail) { 2101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail->l_next = map; 2111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = r_debug_tail; 2121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 2141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 2151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = 0; 2161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 2191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 221bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void remove_soinfo_from_debug_map(soinfo* info) { 2223a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 2235e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 224bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (r_debug_tail == map) { 2255e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev r_debug_tail = map->l_prev; 226bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2275e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 228bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_prev) { 229bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_prev->l_next = map->l_next; 230bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 231bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_next) { 232bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_next->l_prev = map->l_prev; 233bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2345e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2355e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 236bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_load(soinfo* info) { 2371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (info->flags & FLAG_EXE) { 2381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project // GDB already knows about the main executable 2391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 2401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2421728b2396591853345507a063ed6075dfd251706Elliott Hughes ScopedPthreadMutexLocker locker(&g__r_debug_mutex); 2431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2443a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project insert_soinfo_into_debug_map(info); 2481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2493a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2515e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2525e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 253bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_unload(soinfo* info) { 2545e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev if (info->flags & FLAG_EXE) { 2555e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev // GDB already knows about the main executable 2565e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev return; 2575e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev } 2585e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2591728b2396591853345507a063ed6075dfd251706Elliott Hughes ScopedPthreadMutexLocker locker(&g__r_debug_mutex); 2605e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2613a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_DELETE; 2625e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2635e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2645e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev remove_soinfo_from_debug_map(info); 2655e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2663a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2675e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 27018a206c81d9743481e364384affd43306911283dElliott Hughesvoid notify_gdb_of_libraries() { 2713a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2723a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2733a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2743a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 277d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy IvanovLinkedListEntry<soinfo>* SoinfoListAllocator::alloc() { 278d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return g_soinfo_links_allocator.alloc(); 279d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 280d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 281d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid SoinfoListAllocator::free(LinkedListEntry<soinfo>* entry) { 282d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.free(entry); 283d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 284d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 285d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic void protect_data(int protection) { 286d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_allocator.protect_all(protection); 287d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.protect_all(protection); 288d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 289d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 290d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo* soinfo_alloc(const char* name, struct stat* file_stat) { 291ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (strlen(name) >= SOINFO_NAME_LEN) { 292ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("library name \"%s\" too long", name); 293ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 294ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 295ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 2961728b2396591853345507a063ed6075dfd251706Elliott Hughes soinfo* si = g_soinfo_allocator.alloc(); 2971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 298ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Initialize the new element. 299ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn memset(si, 0, sizeof(soinfo)); 300ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn strlcpy(si->name, name, sizeof(si->name)); 301d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->flags = FLAG_NEW_SOINFO; 302d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 303d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (file_stat != NULL) { 304d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->set_st_dev(file_stat->st_dev); 305d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->set_st_ino(file_stat->st_ino); 306d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 307d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 308ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext->next = si; 309ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext = si; 3101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 311ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: allocated soinfo @ %p", name, si); 312ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return si; 3131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 315faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesstatic void soinfo_free(soinfo* si) { 3164688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (si == NULL) { 3174688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return; 3184688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 3194688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 320d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (si->base != 0 && si->size != 0) { 321d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov munmap(reinterpret_cast<void*>(si->base), si->size); 322d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 323d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 3241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *prev = NULL, *trav; 3251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 326ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: freeing soinfo @ %p", si->name, si); 3271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 328d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (trav = solist; trav != NULL; trav = trav->next) { 3291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == si) 3301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 3311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev = trav; 3321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == NULL) { 334d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* si was not in solist */ 3354688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("name \"%s\" is not in solist!", si->name); 3361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 3371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 339d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // clear links to/from si 340d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->remove_all_links(); 341d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 342be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner /* prev will never be NULL, because the first entry in solist is 3431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project always the static libdl_info. 3441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 3451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev->next = si->next; 346d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si == sonext) { 347d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom sonext = prev; 348d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 349d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov 3501728b2396591853345507a063ed6075dfd251706Elliott Hughes g_soinfo_allocator.free(si); 3511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 353cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 354cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_path(const char* path, const char* delimiters, 355cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes const char** array, char* buf, size_t buf_size, size_t max_count) { 356cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (path == NULL) { 357cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return; 358cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 359cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 360cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t len = strlcpy(buf, path, buf_size); 361cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 362cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t i = 0; 363cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes char* buf_p = buf; 364cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { 365cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (*array[i] != '\0') { 366cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes ++i; 367cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 368cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 369cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 370cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // Forget the last path if we had to truncate; this occurs if the 2nd to 371cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // last char isn't '\0' (i.e. wasn't originally a delimiter). 372cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { 373cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i - 1] = NULL; 374cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } else { 375cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i] = NULL; 376cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 377cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 378cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 379cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_LIBRARY_PATH(const char* path) { 3801728b2396591853345507a063ed6075dfd251706Elliott Hughes parse_path(path, ":", g_ld_library_paths, 3811728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_library_paths_buffer, sizeof(g_ld_library_paths_buffer), LDPATH_MAX); 382cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 383cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 384cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_PRELOAD(const char* path) { 385cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // We have historically supported ':' as well as ' ' in LD_PRELOAD. 3861728b2396591853345507a063ed6075dfd251706Elliott Hughes parse_path(path, " :", g_ld_preload_names, 3871728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads_buffer, sizeof(g_ld_preloads_buffer), LDPRELOAD_MAX); 388cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 389cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 3904eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 3914688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* For a given PC, find the .so that it belongs to. 3931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Returns the base address of the .ARM.exidx section 3941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * for that .so, and the number of 8-byte entries 3951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * in that section (via *pcount). 3961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Intended to be called by libc's __gnu_Unwind_Find_exidx(). 3981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3993b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes * This function is exposed via dlfcn.cpp and libdl.so. 4001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 401faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 4021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned addr = (unsigned)pc; 4031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 404faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes for (soinfo* si = solist; si != 0; si = si->next) { 405468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich if ((addr >= si->base) && (addr < (si->base + si->size))) { 406468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich *pcount = si->ARM_exidx_count; 407f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee return (_Unwind_Ptr)si->ARM_exidx; 4081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 410faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes *pcount = 0; 4111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 4121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4134688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 41424053a461e7a20f34002262c1bb122023134989dChristopher Ferris#endif 4154688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Here, we only have to provide a callback to iterate across all the 4171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * loaded libraries. gcc_eh does the rest. */ 418faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesint dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) { 4191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int rv = 0; 420bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 421bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes dl_phdr_info dl_info; 4223a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_addr = si->link_map_head.l_addr; 4233a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_name = si->link_map_head.l_name; 4241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phdr = si->phdr; 4251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phnum = si->phnum; 426bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes rv = cb(&dl_info, sizeof(dl_phdr_info), data); 427bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (rv != 0) { 4281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 429bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 4301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return rv; 4321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4334688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4340266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) { 4350266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 4360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const char* strtab = si->strtab; 4371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", 4390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); 4401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { 4420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = symtab + n; 4430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (strcmp(strtab + s->st_name, name)) continue; 4441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes /* only concern ourselves with global and weak symbol definitions */ 4460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes switch (ELF_ST_BIND(s->st_info)) { 4470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_GLOBAL: 4480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_WEAK: 4490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (s->st_shndx == SHN_UNDEF) { 4500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes continue; 4510266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", 4540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(s->st_value), 4550266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<size_t>(s->st_size)); 4560266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return s; 4571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4580266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return NULL; 4611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 463d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic unsigned elfhash(const char* _name) { 464faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const unsigned char* name = reinterpret_cast<const unsigned char*>(_name); 4651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned h = 0, g; 4661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 467faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes while (*name) { 4681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h = (h << 4) + *name++; 4691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project g = h & 0xf0000000; 4701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g; 4711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g >> 24; 4721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return h; 4741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, soinfo* needed[]) { 477943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan unsigned elf_hash = elfhash(name); 4780266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 4796ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 480c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si != NULL && somain != NULL) { 4815ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel /* 482c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Local scope is executable scope. Just start looking into it right away 483c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * for the shortcut. 4845ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel */ 4855ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 486c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si == somain) { 487c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 4885ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 489c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 4905ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel goto done; 4915ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 492c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } else { 493c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ 494c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 495c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 496c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with symbolic relocations disabled, the 497c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * first place to look to resolve external references is the main 498c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * executable. 499c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 500c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 501c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (!si->has_DT_SYMBOLIC) { 502ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s", 50361a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 504c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 505c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 506c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 507c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 508c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 509c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5105ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 511c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Look for symbols in the local scope (the object who is 5124eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes * searching). This happens with C++ templates on x86 for some 513c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * reason. 514c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * 515c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Notes on weak symbols: 516c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * The ELF specs are ambiguous about treatment of weak definitions in 517c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * dynamic linking. Some systems return the first definition found 518c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * and some the first non-weak definition. This is system dependent. 519c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Here we return the first definition found for simplicity. */ 520c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 521c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 522c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 523c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 524c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 525c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 526c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 527c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 528c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with -Bsymbolic and symbol is not found 529c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * in the local scope, try to find the symbol in the main executable. 530c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 531c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 532c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si->has_DT_SYMBOLIC) { 533ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s after local scope", 53461a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 535c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 536c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 537c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 538c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 539c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 540c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5415ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 542d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 5436ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5444fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer /* Next, look for it in the preloads list */ 5451728b2396591853345507a063ed6075dfd251706Elliott Hughes for (int i = 0; g_ld_preloads[i] != NULL; i++) { 5461728b2396591853345507a063ed6075dfd251706Elliott Hughes s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name); 547d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 5481728b2396591853345507a063ed6075dfd251706Elliott Hughes *lsi = g_ld_preloads[i]; 5494fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer goto done; 5505ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5514fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 5524fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 553d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; needed[i] != NULL; i++) { 554ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in %s", 55561a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, needed[i]->name); 5565ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_elf_lookup(needed[i], elf_hash, name); 5575ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 5585ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel *lsi = needed[i]; 55912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel goto done; 5605ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5616ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5626ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5636ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchevdone: 564d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 565c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " 566c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes "found in %s, base = %p, load bias = %p", 567c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->name, name, reinterpret_cast<void*>(s->st_value), 568c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), 569c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>((*lsi)->load_bias)); 5706ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev return s; 5716ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5726ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 573943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan return NULL; 5746ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev} 5756ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 576d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3). It performs symbol lookup only within the 5776ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev specified soinfo object and not in any of its dependencies. 578d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 579d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom TODO: Only looking in the specified soinfo seems wrong. dlsym(3) says 580d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom that it should do a breadth first search through the dependency 581d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom tree. This agrees with the ELF spec (aka System V Application 582d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Binary Interface) where in Chapter 5 it discuss resolving "Shared 583d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Object Dependencies" in breadth first search order. 5846ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 5850266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dlsym_handle_lookup(soinfo* si, const char* name) { 58616084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner return soinfo_elf_lookup(si, elfhash(name), name); 5871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 5881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 589d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3) to performs a global symbol lookup. If the 590d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom start value is null (for RTLD_DEFAULT), the search starts at the 591d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom beginning of the global solist. Otherwise the search starts at the 592d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom specified soinfo (for RTLD_NEXT). 5936ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 5940266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start) { 595cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes unsigned elf_hash = elfhash(name); 5961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 597cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (start == NULL) { 598cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes start = solist; 599cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6001698d9ebfc7e27271852a1fdf305a2ac37b3ebe4Matt Fischer 6010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 602cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { 603cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes s = soinfo_elf_lookup(si, elf_hash, name); 604cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 605cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes *found = si; 606cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes break; 6071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 608cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 610cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 611c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", 612c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); 613cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 615cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return s; 6161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 618fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Chengsoinfo* find_containing_library(const void* p) { 6190266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) address = reinterpret_cast<ElfW(Addr)>(p); 620fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (soinfo* si = solist; si != NULL; si = si->next) { 621fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (address >= si->base && address - si->base < si->size) { 622fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return si; 623e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 624fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 625fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 626e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 627e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 6280266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dladdr_find_symbol(soinfo* si, const void* addr) { 6290266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) soaddr = reinterpret_cast<ElfW(Addr)>(addr) - si->base; 630fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 631fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // Search the library's symbol table for any defined symbol which 632fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // contains this address. 633fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (size_t i = 0; i < si->nchain; ++i) { 6340266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = &si->symtab[i]; 635fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (sym->st_shndx != SHN_UNDEF && 636fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr >= sym->st_value && 637fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr < sym->st_value + sym->st_size) { 638fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return sym; 639e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 640fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 641e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 642fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 643e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 644e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 645124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library_on_path(const char* name, const char* const paths[]) { 646124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes char buf[512]; 647124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes for (size_t i = 0; paths[i] != NULL; ++i) { 6481e980b6bc8315d00a07312b25486531247abd98cElliott Hughes int n = __libc_format_buffer(buf, sizeof(buf), "%s/%s", paths[i], name); 649124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (n < 0 || n >= static_cast<int>(sizeof(buf))) { 650ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); 651124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes continue; 6521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 653124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); 654124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd != -1) { 655124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 656124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 657124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 658124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return -1; 6591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 661124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library(const char* name) { 662ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ opening %s ]", name); 6631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 664124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // If the name contains a slash, we should attempt to open it directly and not search the paths. 665124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (strchr(name, '/') != NULL) { 6666971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); 6676971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes if (fd != -1) { 6686971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes return fd; 6696971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes } 6706971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. 6715ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#if defined(__LP64__) 672e43c4a7a665032a29cb5ec15d4adbf81ea199220Dmitriy Ivanov return -1; 6735ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#endif 674124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 6751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 676124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. 6771728b2396591853345507a063ed6075dfd251706Elliott Hughes int fd = open_library_on_path(name, g_ld_library_paths); 678124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd == -1) { 6791728b2396591853345507a063ed6075dfd251706Elliott Hughes fd = open_library_on_path(name, kDefaultLdPaths); 680124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 681124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 6821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 684b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* load_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { 6854688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Open the file. 686650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes int fd = open_library(name); 687650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (fd == -1) { 6884688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("library \"%s\" not found", name); 6891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 6902e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin } 6911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 692650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ElfReader elf_reader(name, fd); 693d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 694d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov struct stat file_stat; 695d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (TEMP_FAILURE_RETRY(fstat(fd, &file_stat)) != 0) { 696d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov DL_ERR("unable to stat file for the library %s: %s", name, strerror(errno)); 697d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return NULL; 698d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 699d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 700d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Check for symlink and other situations where 701d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // file can have different names. 702d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov for (soinfo* si = solist; si != NULL; si = si->next) { 703d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (si->get_st_dev() != 0 && 704d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_ino() != 0 && 705d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_dev() == file_stat.st_dev && 706d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_ino() == file_stat.st_ino) { 707d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("library \"%s\" is already loaded under different name/path \"%s\" - will return existing soinfo", name, si->name); 708d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return si; 709d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 710d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 711d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 712b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if ((dlflags & RTLD_NOLOAD) != 0) { 713b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov return NULL; 714b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 715b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 716d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Read the ELF header and load the segments. 71712bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) if (!elf_reader.Load(extinfo)) { 7184688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 71923363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 72023363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner 721489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov soinfo* si = soinfo_alloc(SEARCH_NAME(name), &file_stat); 722650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (si == NULL) { 7234688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 72423363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 725650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->base = elf_reader.load_start(); 726650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->size = elf_reader.load_size(); 727650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->load_bias = elf_reader.load_bias(); 728650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phnum = elf_reader.phdr_count(); 729650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phdr = elf_reader.loaded_phdr(); 730d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 731d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // At this point we know that whatever is loaded @ base is a valid ELF 732d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // shared library whose segments are properly mapped in. 733d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("[ find_library_internal base=%p size=%zu name='%s' ]", 734d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov reinterpret_cast<void*>(si->base), si->size, si->name); 735d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 736d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (!soinfo_link_image(si, extinfo)) { 737d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo_free(si); 738d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return NULL; 739d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 740d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 741650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return si; 7421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 744489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanovstatic soinfo *find_loaded_library_by_name(const char* name) { 745489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov const char* search_name = SEARCH_NAME(name); 746489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov for (soinfo* si = solist; si != NULL; si = si->next) { 747489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov if (!strcmp(search_name, si->name)) { 748489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return si; 74912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 750489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov } 751489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return NULL; 75212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel} 75312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 754b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* find_library_internal(const char* name, int dlflags, const android_dlextinfo* extinfo) { 755d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (name == NULL) { 756d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return somain; 757d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 758d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 759489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov soinfo* si = find_loaded_library_by_name(name); 760b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 761b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Library might still be loaded, the accurate detection 762b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // of this fact is done by load_library 763b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (si == NULL) { 764b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov TRACE("[ '%s' has not been found by name. Trying harder...]", name); 765b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov si = load_library(name, dlflags, extinfo); 766b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 767b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 768b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (si != NULL && (si->flags & FLAG_LINKED) == 0) { 769b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov DL_ERR("recursive link to \"%s\"", si->name); 770d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return NULL; 771d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 77212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 773b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov return si; 774d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 775d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 776b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* find_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { 777b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* si = find_library_internal(name, dlflags, extinfo); 778d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 779ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count++; 780d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 781d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 782d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 783d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 784b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic void soinfo_unload(soinfo* si) { 785ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (si->ref_count == 1) { 786ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("unloading '%s'", si->name); 787d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallDestructors(); 788d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 789d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((si->flags | FLAG_NEW_SOINFO) != 0) { 790d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_children().for_each([&] (soinfo* child) { 791d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("%s needs to unload %s", si->name, child->name); 792d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo_unload(child); 793d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 794d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } else { 795d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 796d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (d->d_tag == DT_NEEDED) { 797d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov const char* library_name = si->strtab + d->d_un.d_val; 798d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("%s needs to unload %s", si->name, library_name); 799b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* needed = find_library(library_name, RTLD_NOLOAD, NULL); 800b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (needed != NULL) { 801b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo_unload(needed); 802b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } else { 803b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Not found: for example if symlink was deleted between dlopen and dlclose 804b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Since we cannot really handle errors at this point - print and continue. 805b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov PRINT("warning: couldn't find %s needed by %s on unload.", library_name, si->name); 806b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 807d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 808d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 8091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 8101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 811d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes notify_gdb_of_unload(si); 812ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 0; 813d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov soinfo_free(si); 814d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } else { 815ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count--; 816c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("not unloading '%s', decrementing ref_count to %zd", si->name, si->ref_count); 817d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 8181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 820a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesvoid do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 8211728b2396591853345507a063ed6075dfd251706Elliott Hughes snprintf(buffer, buffer_size, "%s:%s", kDefaultLdPaths[0], kDefaultLdPaths[1]); 822a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes} 823a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 824cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesvoid do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 825cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (!get_AT_SECURE()) { 826cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_LD_LIBRARY_PATH(ld_library_path); 827cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 828cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 829cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 8301a586293400d0e1d73e6eb82f7dfe9d2d9ed3c4bElliott Hughessoinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) { 831b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL|RTLD_NOLOAD)) != 0) { 832e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes DL_ERR("invalid flags to dlopen: %x", flags); 833e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes return NULL; 834e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes } 835012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) { 836012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) DL_ERR("invalid extended flags to android_dlopen_ext: %x", extinfo->flags); 837012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) return NULL; 838012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) } 839d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 840b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* si = find_library(name, flags, extinfo); 841d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 842d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 843d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 844d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 845d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 846d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 8471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 848b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovvoid do_dlclose(soinfo* si) { 849d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 850b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo_unload(si); 851d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 8521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 8544eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 8559918665a45095ad135576f005c0e5307feb366a1Chris Dearmanstatic int soinfo_relocate(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) { 8560266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 857c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes soinfo* lsi; 858c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 859c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rela) { 8600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rela->r_info); 8610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rela->r_info); 8620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rela->r_offset + si->load_bias); 8630266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 864faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 865c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 866c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 867c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (type == 0) { // R_*_NONE 868c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes continue; 869c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 870c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym != 0) { 871c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 872c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = soinfo_do_lookup(si, sym_name, &lsi, needed); 873c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (s == NULL) { 874c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We only allow an undefined symbol if this is a weak reference... 875c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 876c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 877c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 878c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 879c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 880c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 881c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes /* IHI0044C AAELF 4.5.1.1: 882c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 883c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Libraries are not searched to resolve weak references. 884c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes It is not an error for a weak reference to remain unsatisfied. 885c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 886c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes During linking, the value of an undefined weak reference is: 887c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - Zero if the relocation type is absolute 888c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of the place if the relocation is pc-relative 889c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of nominal base address if the relocation 890c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes type is base-relative. 891c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes */ 892c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 893c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 894e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 895e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 896e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 897e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 898e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 899e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 900e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 901e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 902e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * The sym_addr was initialized to be zero above, or the relocation 903e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * code below does not care about value of sym_addr. 904e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * No need to do anything. 905e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 906e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 907e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 908c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 909c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 910c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 911bb5bb2046fa0759d94995cbfb4f41137cd0b2a91Pavel Chupin case R_X86_64_64: 912c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 913c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // No need to do anything. 914c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 915c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 916c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_addr = reloc; 917c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 9184eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 919c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 920faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rela, idx); 921c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 922c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 923c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 924c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We got a definition. 9250266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 926c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 927c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocSymbol); 928c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 929c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = NULL; 930c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 931c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 932c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 933e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 934e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 935e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 936e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %16llx <- %16llx %s\n", 9380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 940e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 941e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 942e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 943e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %16llx <- %16llx %s\n", 9450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 947e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 948e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 949e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 950e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9510266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS64 %16llx <- %16llx %s\n", 9520266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 954e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 955e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 956e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 957e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9580266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS32 %16llx <- %16llx %s\n", 9590266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 9610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 9620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 963e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9640266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9650266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 9660266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 9670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 968e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 969e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 970e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 971e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 972e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 973e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9740266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS16 %16llx <- %16llx %s\n", 9750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 9770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 9780266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 979e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9800266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9810266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 9820266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 9830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 984e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 985e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 986e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 987e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL64: 988e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 989e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL64 %16llx <- %16llx - %16llx %s\n", 9910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 9920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend) - rela->r_offset; 993e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 994e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL32: 995e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 996e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9970266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %16llx <- %16llx - %16llx %s\n", 9980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 9990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 10000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 10010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1002e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10040266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 10050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 10060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 1007e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1008e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1009e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1010e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL16: 1011e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1012e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10130266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL16 %16llx <- %16llx - %16llx %s\n", 10140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 10160266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 10170266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1018e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10190266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 10210266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 10220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 1023e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1024e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1025e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1026e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1027e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 1028e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1029e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1030e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (sym) { 1031e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("odd RELATIVE form..."); 1032e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1033e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 10340266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %16llx <- %16llx\n", 10350266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (si->base + rela->r_addend)); 10360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (si->base + rela->r_addend); 1037e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1038e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1039e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_COPY: 1040d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if ((si->flags & FLAG_EXE) == 0) { 1041d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich /* 1042d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 1043d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * 1044d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 1045d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * R_AARCH64_COPY may only appear in executable objects where e_type is 1046d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * set to ET_EXEC. 1047d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * 1048d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * FLAG_EXE is set for both ET_DYN and ET_EXEC executables. 1049d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * We should explicitly disallow ET_DYN executables from having 1050d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * R_AARCH64_COPY relocations. 1051d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich */ 1052d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_AARCH64_COPY relocations only supported for ET_EXEC", si->name); 1053d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1054d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1055d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich count_relocation(kRelocCopy); 1056d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich MARK(rela->r_offset); 1057d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich TRACE_TYPE(RELO, "RELO COPY %16llx <- %lld @ %16llx %s\n", 1058d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich reloc, 1059d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich s->st_size, 1060d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich (sym_addr + rela->r_addend), 1061d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich sym_name); 1062d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (reloc == (sym_addr + rela->r_addend)) { 1063d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich ElfW(Sym)* src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); 1064d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich 1065d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (src == NULL) { 1066d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_AARCH64_COPY relocation source cannot be resolved", si->name); 1067d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1068d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1069d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (lsi->has_DT_SYMBOLIC) { 1070d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s invalid R_AARCH64_COPY relocation against DT_SYMBOLIC shared " 1071d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich "library %s (built with -Bsymbolic?)", si->name, lsi->name); 1072d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1073d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1074d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (s->st_size < src->st_size) { 1075d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_AARCH64_COPY relocation size mismatch (%lld < %lld)", 1076d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich si->name, s->st_size, src->st_size); 1077d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1078d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1079d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich memcpy(reinterpret_cast<void*>(reloc), 1080d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich reinterpret_cast<void*>(src->st_value + lsi->load_bias), src->st_size); 1081d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } else { 1082d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_AARCH64_COPY relocation target cannot be resolved", si->name); 1083d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1084d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1085d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich break; 1086e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_TPREL64: 10870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16llx <- %16llx - %16llx\n", 10880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1089e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1090e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_DTPREL32: 10910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16llx <- %16llx - %16llx\n", 10920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1093e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1094e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 1095c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 1096c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1097c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1098c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1099c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 11000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1101c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1102c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 1103c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1104c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1105c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1106c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 11070266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1108c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1109c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 1110c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1111c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1112c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym) { 1113c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("odd RELATIVE form..."); 1114c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1115c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1116c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), 1117c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(si->base)); 11180266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = si->base + rela->r_addend; 1119c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1120c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 1121c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1122c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1123c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1124c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), sym_name); 11250266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1126c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1127c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin case R_X86_64_64: 1128c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin count_relocation(kRelocRelative); 1129c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin MARK(rela->r_offset); 1130c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1131c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin static_cast<size_t>(sym_addr), sym_name); 11320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1133c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin break; 1134c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 1135c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1136c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1137c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", 1138c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), 1139c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), static_cast<size_t>(reloc), sym_name); 11400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend - reloc; 1141c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 11424eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1143e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1144c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 1145faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rela, idx); 1146c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1147c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1148c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1149c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return 0; 1150c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes} 11519918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11529918665a45095ad135576f005c0e5307feb366a1Chris Dearman#else // REL, not RELA. 11539918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic int soinfo_relocate(soinfo* si, ElfW(Rel)* rel, unsigned count, soinfo* needed[]) { 11550266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 1156d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 11571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 11584688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rel) { 11590266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rel->r_info); 11600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes // TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead. 11610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rel->r_info); 11620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + si->load_bias); 11630266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 1164faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 11651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1166c620059479c47a78d57086d73726c9adc2f337adElliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 1167d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (type == 0) { // R_*_NONE 1168d7daacb46372132ae3f0121647074936c304b572Raghu Gandham continue; 1169d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1170d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (sym != 0) { 1171c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 11725ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1173d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s == NULL) { 11744eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We only allow an undefined symbol if this is a weak reference... 1175c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 1176c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 1177e9b6fc6f82276188404a2839e31a2f4c19f6c336Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 1178e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1179e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1180e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1181e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan /* IHI0044C AAELF 4.5.1.1: 1182e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1183e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan Libraries are not searched to resolve weak references. 1184e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan It is not an error for a weak reference to remain 1185e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan unsatisfied. 1186e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1187e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan During linking, the value of an undefined weak reference is: 1188e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - Zero if the relocation type is absolute 1189e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - The address of the place if the relocation is pc-relative 1190bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes - The address of nominal base address if the relocation 1191e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan type is base-relative. 1192e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan */ 1193e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1194e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan switch (type) { 11954eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1196e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_JUMP_SLOT: 1197e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_GLOB_DAT: 1198e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_ABS32: 1199e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_RELATIVE: /* Don't care. */ 12004eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 12014eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 12024eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 12034eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12044eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 1205d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case R_386_JMP_SLOT: 1206e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_GLOB_DAT: 1207e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_32: 1208c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_386_RELATIVE: /* Don't care. */ 12094eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 12104eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 12114eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 1212e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 1213e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_PC32: 1214e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan sym_addr = reloc; 1215e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 12164eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1217e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 12184eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1219e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_COPY: 12204eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // Fall through. Can't really copy if weak symbol is not found at run-time. 12214eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1222e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan default: 1223faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rel, idx); 1224e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1225e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1226e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } else { 12274eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We got a definition. 12280266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 1229d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1230bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocSymbol); 12311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1232e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan s = NULL; 12331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 12341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1235c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 12364eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 12371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_JUMP_SLOT: 1238bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1240ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 12410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_GLOB_DAT: 1244bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1246ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 12470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_ABS32: 1250bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1252ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO ABS %08x <- %08x %s", reloc, sym_addr, sym_name); 12530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 125534ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner case R_ARM_REL32: 1256bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocRelative); 125734ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner MARK(rel->r_offset); 1258ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", 125934ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner reloc, sym_addr, rel->r_offset, sym_name); 12600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr - rel->r_offset; 126134ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner break; 12621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_COPY: 1263d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if ((si->flags & FLAG_EXE) == 0) { 1264d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich /* 1265d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 1266d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * 1267d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 1268d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * R_ARM_COPY may only appear in executable objects where e_type is 1269d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * set to ET_EXEC. 1270d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * 1271d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * TODO: FLAG_EXE is set for both ET_DYN and ET_EXEC executables. 1272d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * We should explicitly disallow ET_DYN executables from having 1273d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich * R_ARM_COPY relocations. 1274d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich */ 1275d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_ARM_COPY relocations only supported for ET_EXEC", si->name); 1276d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1277d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1278d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich count_relocation(kRelocCopy); 1279d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich MARK(rel->r_offset); 1280d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich TRACE_TYPE(RELO, "RELO %08x <- %d @ %08x %s", reloc, s->st_size, sym_addr, sym_name); 1281d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (reloc == sym_addr) { 1282d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich ElfW(Sym)* src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); 1283d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich 1284d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (src == NULL) { 1285d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_ARM_COPY relocation source cannot be resolved", si->name); 1286d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1287d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1288d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (lsi->has_DT_SYMBOLIC) { 1289d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s invalid R_ARM_COPY relocation against DT_SYMBOLIC shared " 1290d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich "library %s (built with -Bsymbolic?)", si->name, lsi->name); 1291d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1292d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1293d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich if (s->st_size < src->st_size) { 1294d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_ARM_COPY relocation size mismatch (%d < %d)", 1295d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich si->name, s->st_size, src->st_size); 1296d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1297d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1298d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich memcpy(reinterpret_cast<void*>(reloc), 1299d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich reinterpret_cast<void*>(src->st_value + lsi->load_bias), src->st_size); 1300d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } else { 1301d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich DL_ERR("%s R_ARM_COPY relocation target cannot be resolved", si->name); 1302d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich return -1; 1303d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich } 1304d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich break; 13054eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 13064eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_JMP_SLOT: 13074eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13084eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13094eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 13100266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 13114eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13124eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_GLOB_DAT: 13134eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13144eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13154eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 13160266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 13174eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13184eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_32: 13194eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13204eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13214eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_32 %08x <- +%08x %s", reloc, sym_addr, sym_name); 13220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 13234eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13244eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_PC32: 13254eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13264eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13274eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", 13284eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); 13290266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr - reloc); 13304eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13314eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__mips__) 13324eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_MIPS_REL32: 13339918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__LP64__) 13349918665a45095ad135576f005c0e5307feb366a1Chris Dearman // MIPS Elf64_Rel entries contain compound relocations 13359918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case 13369918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || 13379918665a45095ad135576f005c0e5307feb366a1Chris Dearman ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { 1338faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)", 13399918665a45095ad135576f005c0e5307feb366a1Chris Dearman type, (unsigned)ELF64_R_TYPE2(rel->r_info), 1340faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (unsigned)ELF64_R_TYPE3(rel->r_info), rel, idx); 13419918665a45095ad135576f005c0e5307feb366a1Chris Dearman return -1; 13429918665a45095ad135576f005c0e5307feb366a1Chris Dearman } 13439918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 13444eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13469918665a45095ad135576f005c0e5307feb366a1Chris Dearman TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), 13479918665a45095ad135576f005c0e5307feb366a1Chris Dearman static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); 13484eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (s) { 13490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 13504eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } else { 13510266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 13524eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13534eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13544eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13554eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes 13564eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 13574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_ARM_RELATIVE: 13584eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 13594eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_RELATIVE: 13604eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13614eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13634eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (sym) { 13644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("odd RELATIVE form..."); 13654eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes return -1; 13664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13674eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", 13684eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); 13690266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 13704eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project default: 1373faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx); 13741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 13751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 13781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1379c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 13801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 138287c358524e479235aa6241736d2ce325f89daafcBrian Carlstromstatic bool mips_relocate_got(soinfo* si, soinfo* needed[]) { 13839918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Addr)** got = si->plt_got; 138487c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (got == NULL) { 138587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 138687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom } 138787c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned local_gotno = si->mips_local_gotno; 138887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned gotsym = si->mips_gotsym; 138987c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned symtabno = si->mips_symtabno; 13900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 1391d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 13929918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[0] is the address of the lazy resolver function. 13939918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[1] may be used for a GNU extension. 13949918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start). 13959918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: maybe this should be in a separate routine? 1396d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if ((si->flags & FLAG_LINKER) == 0) { 139787c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom size_t g = 0; 13989918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef); 13999918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (reinterpret_cast<intptr_t>(got[g]) < 0) { 14009918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed); 1401d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 14029918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Relocate the local GOT entries. 1403d7daacb46372132ae3f0121647074936c304b572Raghu Gandham for (; g < local_gotno; g++) { 14049918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + si->load_bias); 1405d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1406d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1407d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 14089918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Now for the global GOT entries... 14090266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = symtab + gotsym; 1410d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got = si->plt_got + local_gotno; 141187c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { 14129918665a45095ad135576f005c0e5307feb366a1Chris Dearman // This is an undefined reference... try to locate it. 14139918665a45095ad135576f005c0e5307feb366a1Chris Dearman const char* sym_name = si->strtab + sym->st_name; 1414d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 14159918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1416d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (s == NULL) { 14179918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only allow an undefined symbol if this is a weak reference. 1418d7daacb46372132ae3f0121647074936c304b572Raghu Gandham s = &symtab[g]; 1419c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 14204688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot locate \"%s\"...", sym_name); 142187c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return false; 1422d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1423d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *got = 0; 14249918665a45095ad135576f005c0e5307feb366a1Chris Dearman } else { 14259918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: is this sufficient? 14269918665a45095ad135576f005c0e5307feb366a1Chris Dearman // For reference see NetBSD link loader 14279918665a45095ad135576f005c0e5307feb366a1Chris 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 14289918665a45095ad135576f005c0e5307feb366a1Chris Dearman *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value); 1429d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1430d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 143187c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 1432d7daacb46372132ae3f0121647074936c304b572Raghu Gandham} 1433d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1434d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1435812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallArray(const char* array_name __unused, linker_function_t* functions, size_t count, bool reverse) { 1436ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (functions == NULL) { 1437d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1438d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14398215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1440c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("[ Calling %s (size %zd) @ %p for '%s' ]", array_name, count, functions, name); 14418215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1442ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int begin = reverse ? (count - 1) : 0; 1443ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int end = reverse ? -1 : count; 1444ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int step = reverse ? -1 : 1; 14458215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1446ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (int i = begin; i != end; i += step) { 1447ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); 1448ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes CallFunction("function", functions[i]); 1449d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1450d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1451ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s for '%s' ]", array_name, name); 14521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 14531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1454812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallFunction(const char* function_name __unused, linker_function_t function) { 1455db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) { 1456d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1457d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1458d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1459ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); 1460d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes function(); 1461ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); 1462db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes 1463db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures 1464db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // are still writable. This happens with our debug malloc (see http://b/7941716). 1465d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 14669181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov} 14679181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 1468d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallPreInitConstructors() { 14698147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_PREINIT_ARRAY functions are called before any other constructors for executables, 14708147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // but ignored in a shared library. 1471d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); 1472d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 1473e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1474d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallConstructors() { 1475d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (constructors_called) { 1476d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1477d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1478e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1479d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // We set constructors_called before actually calling the constructors, otherwise it doesn't 1480d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // protect against recursive constructor calls. One simple example of constructor recursion 1481d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: 1482d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 1. The program depends on libc, so libc's constructor is called here. 1483d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. 1484d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 3. dlopen() calls the constructors on the newly created 1485d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // soinfo for libc_malloc_debug_leak.so. 1486d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 4. The debug .so depends on libc, so CallConstructors is 1487d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // called again with the libc soinfo. If it doesn't trigger the early- 1488d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // out above, the libc constructor will be called again (recursively!). 1489d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes constructors_called = true; 1490d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 14918147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { 14928147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // The GNU dynamic linker silently ignores these, but we warn the developer. 1493c620059479c47a78d57086d73726c9adc2f337adElliott Hughes PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", 14948147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes name, preinit_array_count); 1495d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1497d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov get_children().for_each([] (soinfo* si) { 1498d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->CallConstructors(); 1499d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 15001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15018147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors", name); 15028147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15038147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_INIT should be called before DT_INIT_ARRAY if both are present. 1504d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_INIT", init_func); 1505d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); 1506e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov} 15078215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1508d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallDestructors() { 15098147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling destructors", name); 15108147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15118147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI_ARRAY must be parsed in reverse order. 1512d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); 15138147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15148147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI should be called after DT_FINI_ARRAY if both are present. 1515d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_FINI", fini_func); 1516b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 1517b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // This is needed on second call to dlopen 1518b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // after library has been unloaded with RTLD_NODELETE 1519b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov constructors_called = false; 15201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 15211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1522d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::add_child(soinfo* child) { 1523d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1524d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1525d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1526d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1527d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov this->children.push_front(child); 1528d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov child->parents.push_front(this); 1529d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1530d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1531d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::remove_all_links() { 1532d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1533d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1534d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1535d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1536d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // 1. Untie connected soinfos from 'this'. 1537d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov children.for_each([&] (soinfo* child) { 1538d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov child->parents.remove_if([&] (const soinfo* parent) { 1539d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return parent == this; 1540d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1541d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1542d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1543d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parents.for_each([&] (soinfo* parent) { 1544d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parent->children.for_each([&] (const soinfo* child) { 1545d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return child == this; 1546d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1547d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1548d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1549d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // 2. Once everything untied - clear local lists. 1550d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parents.clear(); 1551d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov children.clear(); 1552d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1553d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1554d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::set_st_dev(dev_t dev) { 1555d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1556d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1557d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1558d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1559d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov st_dev = dev; 1560d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1561d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1562d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::set_st_ino(ino_t ino) { 1563d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1564d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1565d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1566d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1567d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov st_ino = ino; 1568d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1569d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1570d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovdev_t soinfo::get_st_dev() { 1571d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1572d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return 0; 1573d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1574d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1575d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return st_dev; 1576d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov}; 1577d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1578d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovino_t soinfo::get_st_ino() { 1579d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1580d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return 0; 1581d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1582d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1583d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return st_ino; 1584d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1585d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1586d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov// This is a return on get_children() in case 1587d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov// 'this->flags' does not have FLAG_NEW_SOINFO set. 1588d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo::soinfo_list_t g_empty_list; 1589d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1590d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovsoinfo::soinfo_list_t& soinfo::get_children() { 1591d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1592d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return g_empty_list; 1593d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1594d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1595d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return this->children; 1596d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1597d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 15981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Force any of the closed stdin, stdout and stderr to be associated with 15991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /dev/null. */ 16005419b9474753d25dff947c7740532f86d130c0beElliott Hughesstatic int nullify_closed_stdio() { 16011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int dev_null, i, status; 16021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int return_value = 0; 16031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 160416084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR)); 16051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null < 0) { 16064688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot open /dev/null: %s", strerror(errno)); 16071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 16081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1609ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); 16101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If any of the stdio file descriptors is valid and not associated 16121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project with /dev/null, dup /dev/null to it. */ 16131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for (i = 0; i < 3; i++) { 16141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If it is /dev/null already, we are done. */ 16154688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (i == dev_null) { 16161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16174688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 16181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1619ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Nullifying stdio file descriptor %d]", i); 16204688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); 16211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16224688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes /* If file is opened, we are good. */ 16234688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status != -1) { 16244688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes continue; 16254688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 16261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* The only error we allow is that the file descriptor does not 16281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project exist, in which case we dup /dev/null to it. */ 16291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (errno != EBADF) { 16304688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("fcntl failed: %s", strerror(errno)); 16311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Try dupping /dev/null to this stdio file descriptor and 16361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project repeat if there is a signal. Note that any errors in closing 16371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project the stdio descriptor are lost. */ 16384688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); 16391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (status < 0) { 16404688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("dup2 failed: %s", strerror(errno)); 16411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If /dev/null is not one of the stdio file descriptors, close it. */ 16471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null > 2) { 1648ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); 16494688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(close(dev_null)); 16504688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status == -1) { 16514688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("close failed: %s", strerror(errno)); 16521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return return_value; 16571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 16581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1659183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo) { 1660f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee /* "base" might wrap around UINT32_MAX. */ 16610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) base = si->load_bias; 16620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr = si->phdr; 16631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int phnum = si->phnum; 1664d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom bool relocating_linker = (si->flags & FLAG_LINKER) != 0; 16651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1666b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can't debug anything until the linker is relocated */ 1667b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1668ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ linking %s ]", si->name); 1669c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p si->flags = 0x%08x", reinterpret_cast<void*>(si->base), si->flags); 1670b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 16711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 167263f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner /* Extract dynamic section */ 1673124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes size_t dynamic_count; 16740266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Word) dynamic_flags; 167512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, 1676cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman &dynamic_count, &dynamic_flags); 167763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner if (si->dynamic == NULL) { 1678b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1679124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); 1680b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 1681124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 168263f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } else { 1683b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1684ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("dynamic = %p", si->dynamic); 1685b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 168663f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } 168763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 16884eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 168963f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner (void) phdr_table_get_arm_exidx(phdr, phnum, base, 169063f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner &si->ARM_exidx, &si->ARM_exidx_count); 169163f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner#endif 169263f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 16938147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // Extract useful information from dynamic section. 1694d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom uint32_t needed_count = 0; 16950266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1696c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", 1697c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1698c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (d->d_tag) { 16991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_HASH: 1700faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nbucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[0]; 1701faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nchain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[1]; 1702faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->bucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8); 1703faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->chain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8 + si->nbucket * 4); 17041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_STRTAB: 1706faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->strtab = reinterpret_cast<const char*>(base + d->d_un.d_ptr); 17071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_SYMTAB: 1709faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->symtab = reinterpret_cast<ElfW(Sym)*>(base + d->d_un.d_ptr); 17101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17114eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if !defined(__LP64__) 17121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTREL: 1713d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val != DT_REL) { 1714124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1715124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 17161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1718c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_JMPREL: 17204eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1721faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1722c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1723faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1724c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTRELSZ: 17274eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 17280266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1729c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 17300266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1731c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17339918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__mips__) 17341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTGOT: 17359918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Used by mips and mips64. 17369918665a45095ad135576f005c0e5307feb366a1Chris Dearman si->plt_got = reinterpret_cast<ElfW(Addr)**>(base + d->d_un.d_ptr); 17371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1738c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_DEBUG: 1740bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_DEBUG entry to the address of _r_debug for GDB 1741cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman // if the dynamic table is writable 17429918665a45095ad135576f005c0e5307feb366a1Chris Dearman// FIXME: not working currently for N64 17439918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The flags for the LOAD and DYNAMIC program headers do not agree. 17449918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The LOAD section containng the dynamic table has been mapped as 17459918665a45095ad135576f005c0e5307feb366a1Chris Dearman// read-only, but the DYNAMIC header claims it is writable. 17469918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if !(defined(__mips__) && defined(__LP64__)) 174799c32055cb50443f722c55914869c1f6bb941959Elliott Hughes if ((dynamic_flags & PF_W) != 0) { 1748c620059479c47a78d57086d73726c9adc2f337adElliott Hughes d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); 174999c32055cb50443f722c55914869c1f6bb941959Elliott Hughes } 17501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17519918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 17524eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1753c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELA: 1754faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1755c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1756c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELASZ: 17570266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1758c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1759c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1760c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_REL in \"%s\"", si->name); 1761c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1762c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 1763c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); 1764c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1765c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1766c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1767faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1768c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1769c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 17700266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1771c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1772ad13c57298e57d33c130fb03a2c6494da573408cShin-ichiro KAWASAKI case DT_RELA: 1773124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1774124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1775c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT: 1777ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17788147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT) found at %p", si->name, si->init_func); 17791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI: 1781ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17828147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI) found at %p", si->name, si->fini_func); 17831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAY: 1785ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17868147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT_ARRAY) found at %p", si->name, si->init_array); 17871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAYSZ: 17890266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->init_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 17901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAY: 1792ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17938147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI_ARRAY) found at %p", si->name, si->fini_array); 17941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAYSZ: 17960266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->fini_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 17971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAY: 1799ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->preinit_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 18008147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_PREINIT_ARRAY) found at %p", si->name, si->preinit_array); 18011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAYSZ: 18030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 18041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 18051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_TEXTREL: 1806e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1807e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1808e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1809e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 18105135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->has_text_relocations = true; 18111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1812e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18135ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_SYMBOLIC: 18145ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 18155ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 1816d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom case DT_NEEDED: 1817d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom ++needed_count; 1818d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom break; 18195ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_FLAGS: 1820d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_TEXTREL) { 1821e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1822e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1823e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1824e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 18255ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_text_relocations = true; 1826e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18275ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 1828d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_SYMBOLIC) { 18295ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 18305ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 18315ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 18324eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 1833d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_STRSZ: 1834d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_SYMENT: 1835d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_RELENT: 1836d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1837d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_MAP: 1838bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB. 1839d7daacb46372132ae3f0121647074936c304b572Raghu Gandham { 1840006f9ad8910c945cd50e54f6c34d8c27b11c1193Benjamin Adolphi r_debug** dp = reinterpret_cast<r_debug**>(base + d->d_un.d_ptr); 1841d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *dp = &_r_debug; 1842d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1843d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1844d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_VERSION: 1845d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_FLAGS: 1846d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_BASE_ADDRESS: 1847d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_UNREFEXTNO: 1848d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1849d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1850d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_SYMTABNO: 1851d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_symtabno = d->d_un.d_val; 1852d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1853d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1854d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_LOCAL_GOTNO: 1855d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_local_gotno = d->d_un.d_val; 1856d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1857d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1858d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_GOTSYM: 1859d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_gotsym = d->d_un.d_val; 1860d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18614eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1862d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1863d7daacb46372132ae3f0121647074936c304b572Raghu Gandham default: 18644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DEBUG("Unused DT entry: type %p arg %p", 18654eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1866d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1870c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", 1871c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->strtab, si->symtab); 18721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1873124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Sanity checks. 1874d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (relocating_linker && needed_count != 0) { 1875d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); 1876d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom return false; 1877d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 1878124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->nbucket == 0) { 1879124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); 1880124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1881124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1882124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->strtab == 0) { 1883124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); 1884124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1885124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1886124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->symtab == 0) { 1887124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); 1888124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 18917e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // If this is the main executable, then load all of the libraries from LD_PRELOAD now. 1892d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_EXE) { 18931728b2396591853345507a063ed6075dfd251706Elliott Hughes memset(g_ld_preloads, 0, sizeof(g_ld_preloads)); 18947e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes size_t preload_count = 0; 18951728b2396591853345507a063ed6075dfd251706Elliott Hughes for (size_t i = 0; g_ld_preload_names[i] != NULL; i++) { 1896b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* lsi = find_library(g_ld_preload_names[i], 0, NULL); 18977e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes if (lsi != NULL) { 18981728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads[preload_count++] = lsi; 18997e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes } else { 19007e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // As with glibc, failure to load an LD_PRELOAD library is just a warning. 19017e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", 19021728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preload_names[i], si->name, linker_get_error_buffer()); 19034fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 19044fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 19054fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 19064fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1907faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes soinfo** needed = reinterpret_cast<soinfo**>(alloca((1 + needed_count) * sizeof(soinfo*))); 1908d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo** pneeded = needed; 190912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 19100266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1911d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1912d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 1913ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s needs %s", si->name, library_name); 1914b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* lsi = find_library(library_name, 0, NULL); 1915d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (lsi == NULL) { 1916650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); 19174688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("could not load library \"%s\" needed by \"%s\"; caused by %s", 1918d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom library_name, si->name, tmp_err_buf); 1919124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1921d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1922d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->add_child(lsi); 192312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded++ = lsi; 19241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 19251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 192612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded = NULL; 19271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1928e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 19295135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1930e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // Make segments writable to allow text relocations to work properly. We will later call 1931e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // phdr_table_protect_segments() after all of them are applied and all constructors are run. 1932865119efd47ae3cae5a0c09c6a9cc184a10614c1Du Chenyang#if !defined(__i386__) // The platform itself has too many text relocations on x86. 19333d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich DL_WARN("%s has text relocations. This is wasting memory and prevents " 19343d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich "security hardening. Please fix.", si->name); 1935865119efd47ae3cae5a0c09c6a9cc184a10614c1Du Chenyang#endif 19365135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 19375135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't unprotect loadable segments for \"%s\": %s", 19385135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1939124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19405135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 19415135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 1942e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 19435135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich 19444eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1945c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->plt_rela != NULL) { 1946faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]\n", si->name); 19479918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) { 1948c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1949c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1950c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1951c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->rela != NULL) { 1952faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]\n", si->name); 19539918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->rela, si->rela_count, needed)) { 1954c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1955c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1956c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1957c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1958d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->plt_rel != NULL) { 1959faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]", si->name); 1960d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { 1961124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1962124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1964d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->rel != NULL) { 1965faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]", si->name); 1966d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { 1967124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1968124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1970c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 19711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19724eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 197387c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (!mips_relocate_got(si, needed)) { 1974124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1975d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1976d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1977d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 19781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_LINKED; 1979ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ finished linking %s ]", si->name); 19801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1981e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 19825135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1983e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // All relocations are done, we can protect our segments back to read-only. 19845135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 19855135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't protect segments for \"%s\": %s", 19865135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1987124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19885135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 19891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1990e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 19911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1992b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can also turn on GNU RELRO protection */ 1993b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) { 19944688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", 19954688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes si->name, strerror(errno)); 1996124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19979ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich } 19989ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich 1999183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) /* Handle serializing/sharing the RELRO segment */ 2000183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (extinfo && (extinfo->flags & ANDROID_DLEXT_WRITE_RELRO)) { 2001183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_serialize_gnu_relro(si->phdr, si->phnum, si->load_bias, 2002183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 2003183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed serializing GNU RELRO section for \"%s\": %s", 2004183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 2005183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 2006183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 2007183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } else if (extinfo && (extinfo->flags & ANDROID_DLEXT_USE_RELRO)) { 2008183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_map_gnu_relro(si->phdr, si->phnum, si->load_bias, 2009183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 2010183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed mapping GNU RELRO section for \"%s\": %s", 2011183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 2012183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 2013183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 2014183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 2015183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 20161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project notify_gdb_of_load(si); 2017124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return true; 20181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 20191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2020468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2021c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * This function add vdso to internal dso list. 2022c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * It helps to stack unwinding through signal handlers. 2023c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * Also, it makes bionic more like glibc. 2024c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov */ 2025812fd4263a005b88f3b4222baa910114f938d594Kito Chengstatic void add_vdso(KernelArgumentBlock& args __unused) { 20264eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(AT_SYSINFO_EHDR) 20270266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(args.getauxval(AT_SYSINFO_EHDR)); 20280266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (ehdr_vdso == NULL) { 20290266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return; 20300266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 2031c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2032d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo* si = soinfo_alloc("[vdso]", NULL); 2033ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 20340266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); 20350266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phnum = ehdr_vdso->e_phnum; 20360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(ehdr_vdso); 20370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->size = phdr_table_get_load_size(si->phdr, si->phnum); 20380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = get_elf_exec_load_bias(ehdr_vdso); 2039ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 20400dcf06f976670b5d05286b184d150f61b71c1184Torne (Richard Coles) soinfo_link_image(si, NULL); 2041c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov#endif 2042c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov} 2043c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2044c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov/* 2045d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * This is linker soinfo for GDB. See details below. 2046d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2047d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo linker_soinfo_for_gdb; 2048d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2049d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov/* gdb expects the linker to be in the debug shared object list. 2050d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Without this, gdb has trouble locating the linker's ".text" 2051d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * and ".plt" sections. Gdb could also potentially use this to 2052d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * relocate the offset of our exported 'rtld_db_dlactivity' symbol. 2053d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Don't use soinfo_alloc(), because the linker shouldn't 2054d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * be on the soinfo list. 2055d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2056d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic void init_linker_info_for_gdb(ElfW(Addr) linker_base) { 2057d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#if defined(__LP64__) 2058d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker64", sizeof(linker_soinfo_for_gdb.name)); 2059d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#else 2060d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker", sizeof(linker_soinfo_for_gdb.name)); 2061d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#endif 2062d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov linker_soinfo_for_gdb.flags = FLAG_NEW_SOINFO; 2063d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov linker_soinfo_for_gdb.base = linker_base; 2064d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2065d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov /* 2066d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Set the dynamic field in the link map otherwise gdb will complain with 2067d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * the following: 2068d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * warning: .dynamic section for "/system/bin/linker" is not at the 2069d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * expected address (wrong library or version mismatch?) 2070d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2071d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_base); 2072d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_base + elf_hdr->e_phoff); 2073d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, 2074d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov &linker_soinfo_for_gdb.dynamic, NULL, NULL); 2075d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov insert_soinfo_into_debug_map(&linker_soinfo_for_gdb); 2076d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 2077d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2078d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov/* 2079468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This code is called after the linker has linked itself and 2080468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * fixed it's own GOT. It is safe to make references to externs 2081468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * and other non-local data at this point. 2082468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 20830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(Addr) linker_base) { 208442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes /* NOTE: we store the args pointer on a special location 2085ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * of the temporary TLS area in order to pass it to 2086ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * the C Library's runtime initializer. 2087ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * 2088ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * The initializer must clear the slot and reset the TLS 2089ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * to point to a different location to ensure that no other 2090ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * shared library constructor can access it. 2091ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner */ 2092d3920b3a996b358e48232f417aa0a1e44a60f155Elliott Hughes __libc_init_tls(args); 20931a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov 20941a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#if TIMING 20951a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov struct timeval t0, t1; 20961a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov gettimeofday(&t0, 0); 20971a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#endif 20981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 209918a206c81d9743481e364384affd43306911283dElliott Hughes // Initialize environment functions, and get to the ELF aux vectors table. 210042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_env_init(args); 2101be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 21028d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // If this is a setuid/setgid program, close the security hole described in 21038d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc 21048d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich if (get_AT_SECURE()) { 21058d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich nullify_closed_stdio(); 21068d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich } 21078d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich 2108d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom debuggerd_init(); 21091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 211018a206c81d9743481e364384affd43306911283dElliott Hughes // Get a few environment variables. 211161a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes const char* LD_DEBUG = linker_env_get("LD_DEBUG"); 211261a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes if (LD_DEBUG != NULL) { 21131728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_debug_verbosity = atoi(LD_DEBUG); 211418a206c81d9743481e364384affd43306911283dElliott Hughes } 2115be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 211618a206c81d9743481e364384affd43306911283dElliott Hughes // Normally, these are cleaned by linker_env_init, but the test 211718a206c81d9743481e364384affd43306911283dElliott Hughes // doesn't cost us anything. 211818a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpath_env = NULL; 211918a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpreload_env = NULL; 212018a206c81d9743481e364384affd43306911283dElliott Hughes if (!get_AT_SECURE()) { 212118a206c81d9743481e364384affd43306911283dElliott Hughes ldpath_env = linker_env_get("LD_LIBRARY_PATH"); 212218a206c81d9743481e364384affd43306911283dElliott Hughes ldpreload_env = linker_env_get("LD_PRELOAD"); 21231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2125d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov // Linker does not call constructors for its own 2126d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov // global variables so we need to initialize 2127d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // the allocators explicitly. 21281728b2396591853345507a063ed6075dfd251706Elliott Hughes g_soinfo_allocator.init(); 2129d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.init(); 2130d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov 2131ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ android linker & debugger ]"); 21321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2133d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo* si = soinfo_alloc(args.argv[0], NULL); 213418a206c81d9743481e364384affd43306911283dElliott Hughes if (si == NULL) { 213518a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 21361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2138d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* bootstrap the link map, the main exe always needs to be first */ 21391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_EXE; 21403a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(si->link_map_head); 21411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_addr = 0; 214342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes map->l_name = args.argv[0]; 21441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = NULL; 21451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = NULL; 21461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 21481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 21491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2150d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov init_linker_info_for_gdb(linker_base); 21511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 215242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Extract information passed from the kernel. 21530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(args.getauxval(AT_PHDR)); 215442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->phnum = args.getauxval(AT_PHNUM); 215542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->entry = args.getauxval(AT_ENTRY); 21561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21578180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner /* Compute the value of si->base. We can't rely on the fact that 21588180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * the first entry is the PHDR because this will not be true 21598180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * for certain executables (e.g. some in the NDK unit test suite) 21608180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner */ 21618180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner si->base = 0; 2162b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner si->size = phdr_table_get_load_size(si->phdr, si->phnum); 2163bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner si->load_bias = 0; 2164ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (size_t i = 0; i < si->phnum; ++i) { 216542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes if (si->phdr[i].p_type == PT_PHDR) { 21660266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_vaddr; 21670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_offset; 216842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes break; 216942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 21708180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner } 2171d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->dynamic = NULL; 2172ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 1; 21731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2174d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich#if defined(__LP64__) 21752aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base); 21762aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich if (elf_hdr->e_type != ET_DYN) { 21772aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n"); 21782aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich exit(EXIT_FAILURE); 21792aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich } 2180d81b3b275dff99561cbe5905ca63a1c72fa54a17Nick Kralevich#endif 21812aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich 21824688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). 21834688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_LIBRARY_PATH(ldpath_env); 21844688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_PRELOAD(ldpreload_env); 21854fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 21865ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel somain = si; 21875ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 2188183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(si, NULL)) { 2189650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer()); 219018a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 21911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2193c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov add_vdso(args); 2194c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2195d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallPreInitConstructors(); 21969181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 21971728b2396591853345507a063ed6075dfd251706Elliott Hughes for (size_t i = 0; g_ld_preloads[i] != NULL; ++i) { 21981728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads[i]->CallConstructors(); 2199326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng } 2200326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng 2201d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* After the link_image, the si->load_bias is initialized. 2202d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * For so lib, the map->l_addr will be updated in notify_gdb_of_load. 2203d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * We need to update this value for so exe here. So Unwind_Backtrace 2204d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * for some arch like x86 could work correctly within so exe. 22059c3449ecd9d5e9cdb1e995e35e53334a4a288a5eXiaokang Qin */ 2206c5db969aa4a24a76fc0964f2ff89533e832b47a6Chao-Ying Fu map->l_addr = si->load_bias; 2207d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 2208e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 22091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING 2210faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes gettimeofday(&t1, NULL); 2211ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("LINKER TIME: %s: %d microseconds", args.argv[0], (int) ( 22121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - 2213faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec))); 22141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 2216ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol", args.argv[0], 2217bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocAbsolute], 2218bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocRelative], 2219bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocCopy], 2220bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocSymbol]); 22211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 22231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project { 22241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 22251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned i; 22261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = 0; 2227d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (n = 0; n < 4096; n++) { 2228d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (bitmask[n]) { 22291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned x = bitmask[n]; 2230e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 2231e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland for (i = 0; i < 32; i++) { 2232e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 2233d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (i = 0; i < 8; i++) { 2234e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 2235d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (x & 1) { 2236d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom count++; 2237d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 22381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project x >>= 1; 22391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 22401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 22411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2242ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("PAGES MODIFIED: %s: %d (%dKB)", args.argv[0], count, count * 4); 22431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 22441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 22461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING || STATS || COUNT_PAGES 22471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fflush(stdout); 22481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2250c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE("[ Ready to execute '%s' @ %p ]", si->name, reinterpret_cast<void*>(si->entry)); 22511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return si->entry; 22521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2253468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 2254bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner/* Compute the load-bias of an existing executable. This shall only 2255bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * be used to compute the load bias of an executable or shared library 2256bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * that was loaded by the kernel itself. 2257bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * 2258bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Input: 2259bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * elf -> address of ELF header, assumed to be at the start of the file. 2260bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Return: 2261bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * load bias, i.e. add the value of any p_vaddr in the file to get 2262bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * the corresponding address in memory. 2263bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner */ 22640266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) { 22650266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) offset = elf->e_phoff; 2266faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const ElfW(Phdr)* phdr_table = reinterpret_cast<const ElfW(Phdr)*>(reinterpret_cast<uintptr_t>(elf) + offset); 22670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr_end = phdr_table + elf->e_phnum; 2268fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 22690266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (const ElfW(Phdr)* phdr = phdr_table; phdr < phdr_end; phdr++) { 2270fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (phdr->p_type == PT_LOAD) { 22710266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return reinterpret_cast<ElfW(Addr)>(elf) + phdr->p_offset - phdr->p_vaddr; 2272bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner } 2273fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 2274fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return 0; 2275bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner} 2276bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner 2277468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2278468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This is the entry point for the linker, called from begin.S. This 2279468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * method is responsible for fixing the linker's own relocations, and 2280468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * then calling __linker_init_post_relocation(). 2281468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * 2282468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * Because this method is called before the linker has fixed it's own 2283468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * relocations, any attempt to reference an extern variable, extern 2284468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * function, or other GOT reference will generate a segfault. 2285468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 22860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesextern "C" ElfW(Addr) __linker_init(void* raw_args) { 2287d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Initialize static variables. 2288d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov solist = get_libdl_info(); 2289d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov sonext = get_libdl_info(); 2290d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 229142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes KernelArgumentBlock args(raw_args); 229242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 22930266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) linker_addr = args.getauxval(AT_BASE); 22940266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr); 2295faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff); 229642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 229742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo linker_so; 229842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes memset(&linker_so, 0, sizeof(soinfo)); 229942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2300b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes strcpy(linker_so.name, "[dynamic linker]"); 230142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.base = linker_addr; 230242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); 230342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); 2304d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_so.dynamic = NULL; 230542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phdr = phdr; 230642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phnum = elf_hdr->e_phnum; 230742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.flags |= FLAG_LINKER; 230842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2309183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(&linker_so, NULL)) { 231042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // It would be nice to print an error message, but if the linker 231142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // can't link itself, there's no guarantee that we'll be able to 2312b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // call write() (because it involves a GOT reference). We may as 2313b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // well try though... 2314b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes const char* msg = "CANNOT LINK EXECUTABLE: "; 2315b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, msg, strlen(msg)); 2316b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); 2317b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, "\n", 1); 2318b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes _exit(EXIT_FAILURE); 231942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 2320468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 232142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // We have successfully fixed our own relocations. It's safe to run 232242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // the main part of the linker now. 23231728b2396591853345507a063ed6075dfd251706Elliott Hughes args.abort_message_ptr = &g_abort_message; 23240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) start_address = __linker_init_post_relocation(args, linker_addr); 23255419b9474753d25dff947c7740532f86d130c0beElliott Hughes 2326d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 2327d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 232842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Return the address that the calling assembly stub should jump to. 232942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes return start_address; 2330468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich} 2331