linker.cpp revision 76e289c026f11126fc88841b3019fd5bb419bb67
11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 2943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan * Copyright (C) 2008, 2009 The Android Open Source Project 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions of source code must retain the above copyright 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions in binary form must reproduce the above copyright 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * the documentation and/or other materials provided with the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 294688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <dlfcn.h> 304688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <errno.h> 314688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <fcntl.h> 320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes#include <inttypes.h> 334688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <pthread.h> 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdlib.h> 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <string.h> 374688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/mman.h> 384688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/stat.h> 394688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <unistd.h> 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 414688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Private C library headers. 42eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/bionic_tls.h" 43eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/KernelArgumentBlock.h" 44eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/ScopedPthreadMutexLocker.h" 4504dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov#include "private/ScopedFd.h" 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker.h" 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker_debug.h" 49be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner#include "linker_environ.h" 5023363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner#include "linker_phdr.h" 51d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov#include "linker_allocator.h" 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Do NOT use malloc() and friends or pthread_*() code here. 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Don't use printf() either; it's caused mysterious memory 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * corruption in the past. 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The linker runs before we bring up libc and it's easiest 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * to make sure it does not depend on any complex libc features 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * open issues / todo: 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - cleaner error reporting 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - after linking, set as much stuff as possible to READONLY 651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * and NOEXEC 664688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes */ 671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 68489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#if defined(__LP64__) 69489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#define SEARCH_NAME(x) x 70489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#else 71489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov// Nvidia drivers are relying on the bug: 72489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov// http://code.google.com/p/android/issues/detail?id=6670 73489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov// so we continue to use base-name lookup for lp32 74489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanovstatic const char* get_base_name(const char* name) { 75489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov const char* bname = strrchr(name, '/'); 76489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return bname ? bname + 1 : name; 77489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov} 78489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#define SEARCH_NAME(x) get_base_name(x) 79489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov#endif 80489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov 81183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo); 820266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf); 831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 841728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic LinkerAllocator<soinfo> g_soinfo_allocator; 85d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic LinkerAllocator<LinkedListEntry<soinfo>> g_soinfo_links_allocator; 86ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 87d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo* solist; 88d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo* sonext; 89d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* somain; /* main process, always the one after libdl_info */ 901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 911728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic const char* const kDefaultLdPaths[] = { 924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 93011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/vendor/lib64", 94011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/system/lib64", 95011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#else 96124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/vendor/lib", 97124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/system/lib", 98011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#endif 99124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes NULL 100124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes}; 101124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes 102a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_BUFSIZE (LDPATH_MAX*64) 103a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_MAX 8 104a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 105a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_BUFSIZE (LDPRELOAD_MAX*64) 106a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_MAX 8 107a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 1081728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic char g_ld_library_paths_buffer[LDPATH_BUFSIZE]; 1091728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic const char* g_ld_library_paths[LDPATH_MAX + 1]; 110bc3a5c26f1b9cf29da6abfc3e197258ef4c03362David Bartley 1111728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic char g_ld_preloads_buffer[LDPRELOAD_BUFSIZE]; 1121728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic const char* g_ld_preload_names[LDPRELOAD_MAX + 1]; 1134fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1141728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic soinfo* g_ld_preloads[LDPRELOAD_MAX + 1]; 1154fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1161728b2396591853345507a063ed6075dfd251706Elliott Hughes__LIBC_HIDDEN__ int g_ld_debug_verbosity; 1171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1181728b2396591853345507a063ed6075dfd251706Elliott Hughes__LIBC_HIDDEN__ abort_msg_t* g_abort_message = NULL; // For debuggerd. 1190d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes 120bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesenum RelocationKind { 121bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocAbsolute = 0, 122bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocRelative, 123bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocCopy, 124bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocSymbol, 125bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocMax 126bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 127be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 128d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanovenum class SymbolLookupScope { 129d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov kAllowLocal, 130d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov kExcludeLocal, 131d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov}; 132d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov 1331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 134bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstruct linker_stats_t { 135bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes int count[kRelocMax]; 136bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 137bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 138bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic linker_stats_t linker_stats; 139bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 140bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind kind) { 141bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes ++linker_stats.count[kind]; 142bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 143bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 144bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind) { 145bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 1461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 149bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic unsigned bitmask[4096]; 150e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 151e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#define MARK(offset) \ 152e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland do { \ 153e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((((offset) >> 12) >> 5) < 4096) \ 154e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \ 155faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 156e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 157bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(offset) \ 158bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes do { \ 159bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ 160faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 161e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 162bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 163bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(x) do {} while (0) 1641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1664688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// You shouldn't try to call memory-allocating functions in the dynamic linker. 1674688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Guard against the most obvious ones. 1688f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes#define DISALLOW_ALLOCATION(return_type, name, ...) \ 1698f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes return_type name __VA_ARGS__ \ 1708f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes { \ 17112bf3bcdeeaa0dcdc7a4f4e4d11bc2fc3bf6bd7aDmitriy Ivanov __libc_fatal("ERROR: " #name " called from the dynamic linker!\n"); \ 1724688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 173812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, malloc, (size_t u __unused)); 174812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void, free, (void* u __unused)); 175812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, realloc, (void* u1 __unused, size_t u2 __unused)); 176812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, calloc, (size_t u1 __unused, size_t u2 __unused)); 1772e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 1780353195f344666256dba474a15c9ba22cf0cccc9Dima Zavinstatic char tmp_err_buf[768]; 1792e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavinstatic char __linker_dl_err_buf[768]; 1802e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 181650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hugheschar* linker_get_error_buffer() { 1825419b9474753d25dff947c7740532f86d130c0beElliott Hughes return &__linker_dl_err_buf[0]; 1832e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin} 1842e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 185650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughessize_t linker_get_error_buffer_size() { 186650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return sizeof(__linker_dl_err_buf); 187650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes} 188650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 1891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 1901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This function is an empty stub where GDB locates a breakpoint to get notified 1911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about linker activity. 1921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 1935419b9474753d25dff947c7740532f86d130c0beElliott Hughesextern "C" void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity(); 1941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1951728b2396591853345507a063ed6075dfd251706Elliott Hughesstatic pthread_mutex_t g__r_debug_mutex = PTHREAD_MUTEX_INITIALIZER; 1963a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic r_debug _r_debug = {1, NULL, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0}; 1973a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic link_map* r_debug_tail = 0; 1981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1993a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic void insert_soinfo_into_debug_map(soinfo* info) { 200bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Copy the necessary fields into the debug structure. 2013a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 202ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov map->l_addr = info->load_bias; 203faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes map->l_name = reinterpret_cast<char*>(info->name); 2043a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes map->l_ld = info->dynamic; 2051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Stick the new library at the end of the list. 2071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * gdb tends to care more about libc than it does 2081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about leaf libraries, and ordering it this way 2091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * reduces the back-and-forth over the wire. 2101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 2111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (r_debug_tail) { 2121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail->l_next = map; 2131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = r_debug_tail; 2141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 2161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 2171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = 0; 2181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 2211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 223bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void remove_soinfo_from_debug_map(soinfo* info) { 2243a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 2255e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 226bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (r_debug_tail == map) { 2275e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev r_debug_tail = map->l_prev; 228bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2295e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 230bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_prev) { 231bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_prev->l_next = map->l_next; 232bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 233bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_next) { 234bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_next->l_prev = map->l_prev; 235bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2365e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2375e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 238bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_load(soinfo* info) { 2391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (info->flags & FLAG_EXE) { 2401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project // GDB already knows about the main executable 2411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 2421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2441728b2396591853345507a063ed6075dfd251706Elliott Hughes ScopedPthreadMutexLocker locker(&g__r_debug_mutex); 2451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2463a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project insert_soinfo_into_debug_map(info); 2501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2513a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2535e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2545e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 255bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_unload(soinfo* info) { 2565e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev if (info->flags & FLAG_EXE) { 2575e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev // GDB already knows about the main executable 2585e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev return; 2595e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev } 2605e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2611728b2396591853345507a063ed6075dfd251706Elliott Hughes ScopedPthreadMutexLocker locker(&g__r_debug_mutex); 2625e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2633a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_DELETE; 2645e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2655e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2665e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev remove_soinfo_from_debug_map(info); 2675e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2683a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2695e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 27218a206c81d9743481e364384affd43306911283dElliott Hughesvoid notify_gdb_of_libraries() { 2733a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2743a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2753a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2763a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 279d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy IvanovLinkedListEntry<soinfo>* SoinfoListAllocator::alloc() { 280d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return g_soinfo_links_allocator.alloc(); 281d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 282d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 283d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid SoinfoListAllocator::free(LinkedListEntry<soinfo>* entry) { 284d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.free(entry); 285d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 286d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 287d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic void protect_data(int protection) { 288d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_allocator.protect_all(protection); 289d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.protect_all(protection); 290d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 291d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 292d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo* soinfo_alloc(const char* name, struct stat* file_stat) { 293ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (strlen(name) >= SOINFO_NAME_LEN) { 294ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("library name \"%s\" too long", name); 295ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 296ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 297ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 2981728b2396591853345507a063ed6075dfd251706Elliott Hughes soinfo* si = g_soinfo_allocator.alloc(); 2991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 300ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Initialize the new element. 301ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn memset(si, 0, sizeof(soinfo)); 302ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn strlcpy(si->name, name, sizeof(si->name)); 303d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->flags = FLAG_NEW_SOINFO; 304d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 305d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (file_stat != NULL) { 306d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->set_st_dev(file_stat->st_dev); 307d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->set_st_ino(file_stat->st_ino); 308d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 309d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 310ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext->next = si; 311ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext = si; 3121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 313ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: allocated soinfo @ %p", name, si); 314ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return si; 3151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 317faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesstatic void soinfo_free(soinfo* si) { 3184688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (si == NULL) { 3194688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return; 3204688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 3214688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 322d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (si->base != 0 && si->size != 0) { 323d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov munmap(reinterpret_cast<void*>(si->base), si->size); 324d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 325d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 3261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *prev = NULL, *trav; 3271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 328ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: freeing soinfo @ %p", si->name, si); 3291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 330d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (trav = solist; trav != NULL; trav = trav->next) { 3311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == si) 3321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 3331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev = trav; 3341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == NULL) { 336d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* si was not in solist */ 3374688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("name \"%s\" is not in solist!", si->name); 3381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 3391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 341d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // clear links to/from si 342d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->remove_all_links(); 343d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 344be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner /* prev will never be NULL, because the first entry in solist is 3451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project always the static libdl_info. 3461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 3471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev->next = si->next; 348d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si == sonext) { 349d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom sonext = prev; 350d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 351d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov 3521728b2396591853345507a063ed6075dfd251706Elliott Hughes g_soinfo_allocator.free(si); 3531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 355cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 356cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_path(const char* path, const char* delimiters, 357cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes const char** array, char* buf, size_t buf_size, size_t max_count) { 358cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (path == NULL) { 359cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return; 360cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 361cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 362cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t len = strlcpy(buf, path, buf_size); 363cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 364cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t i = 0; 365cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes char* buf_p = buf; 366cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { 367cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (*array[i] != '\0') { 368cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes ++i; 369cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 370cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 371cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 372cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // Forget the last path if we had to truncate; this occurs if the 2nd to 373cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // last char isn't '\0' (i.e. wasn't originally a delimiter). 374cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { 375cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i - 1] = NULL; 376cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } else { 377cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i] = NULL; 378cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 379cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 380cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 381cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_LIBRARY_PATH(const char* path) { 3821728b2396591853345507a063ed6075dfd251706Elliott Hughes parse_path(path, ":", g_ld_library_paths, 3831728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_library_paths_buffer, sizeof(g_ld_library_paths_buffer), LDPATH_MAX); 384cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 385cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 386cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_PRELOAD(const char* path) { 387cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // We have historically supported ':' as well as ' ' in LD_PRELOAD. 3881728b2396591853345507a063ed6075dfd251706Elliott Hughes parse_path(path, " :", g_ld_preload_names, 3891728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads_buffer, sizeof(g_ld_preloads_buffer), LDPRELOAD_MAX); 390cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 391cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 3924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 3934688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* For a given PC, find the .so that it belongs to. 3951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Returns the base address of the .ARM.exidx section 3961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * for that .so, and the number of 8-byte entries 3971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * in that section (via *pcount). 3981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Intended to be called by libc's __gnu_Unwind_Find_exidx(). 4001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 4013b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes * This function is exposed via dlfcn.cpp and libdl.so. 4021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 403faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 4041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned addr = (unsigned)pc; 4051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 406faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes for (soinfo* si = solist; si != 0; si = si->next) { 407468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich if ((addr >= si->base) && (addr < (si->base + si->size))) { 408468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich *pcount = si->ARM_exidx_count; 409f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee return (_Unwind_Ptr)si->ARM_exidx; 4101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 412faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes *pcount = 0; 4131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 4141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4154688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 41624053a461e7a20f34002262c1bb122023134989dChristopher Ferris#endif 4174688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Here, we only have to provide a callback to iterate across all the 4191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * loaded libraries. gcc_eh does the rest. */ 420faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesint dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) { 4211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int rv = 0; 422bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 423bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes dl_phdr_info dl_info; 4243a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_addr = si->link_map_head.l_addr; 4253a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_name = si->link_map_head.l_name; 4261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phdr = si->phdr; 4271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phnum = si->phnum; 428bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes rv = cb(&dl_info, sizeof(dl_phdr_info), data); 429bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (rv != 0) { 4301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 431bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 4321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return rv; 4341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4354688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 436d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanovstatic ElfW(Sym)* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name, const SymbolLookupScope& lookup_scope) { 4370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 4380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const char* strtab = si->strtab; 4391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", 4410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); 4421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { 4440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = symtab + n; 4450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (strcmp(strtab + s->st_name, name)) continue; 4461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes switch (ELF_ST_BIND(s->st_info)) { 4480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_GLOBAL: 4490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_WEAK: 4500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (s->st_shndx == SHN_UNDEF) { 451d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov continue; 452d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov } 4531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 454d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", 4550266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(s->st_value), 4560266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<size_t>(s->st_size)); 457d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov return s; 458d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov case STB_LOCAL: 459d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov if (lookup_scope != SymbolLookupScope::kAllowLocal) { 460d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov continue; 461d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov } 462d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov TRACE_TYPE(LOOKUP, "FOUND LOCAL %s in %s (%p) %zd", 463d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov name, si->name, reinterpret_cast<void*>(s->st_value), 464d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov static_cast<size_t>(s->st_size)); 465d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov return s; 466d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov default: 46712bf3bcdeeaa0dcdc7a4f4e4d11bc2fc3bf6bd7aDmitriy Ivanov __libc_fatal("ERROR: Unexpected ST_BIND value: %d for '%s' in '%s'", 46812bf3bcdeeaa0dcdc7a4f4e4d11bc2fc3bf6bd7aDmitriy Ivanov ELF_ST_BIND(s->st_info), name, si->name); 4691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4700266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4720266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return NULL; 4731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 475d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic unsigned elfhash(const char* _name) { 476faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const unsigned char* name = reinterpret_cast<const unsigned char*>(_name); 4771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned h = 0, g; 4781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 479faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes while (*name) { 4801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h = (h << 4) + *name++; 4811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project g = h & 0xf0000000; 4821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g; 4831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g >> 24; 4841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return h; 4861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, soinfo* needed[]) { 489943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan unsigned elf_hash = elfhash(name); 4900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 4916ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 492c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si != NULL && somain != NULL) { 4935ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel /* 494c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Local scope is executable scope. Just start looking into it right away 495c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * for the shortcut. 4965ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel */ 4975ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 498c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si == somain) { 499d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov s = soinfo_elf_lookup(si, elf_hash, name, SymbolLookupScope::kAllowLocal); 5005ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 501c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 5025ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel goto done; 5035ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 504c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } else { 505c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ 506c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 507c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 508c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with symbolic relocations disabled, the 509c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * first place to look to resolve external references is the main 510c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * executable. 511c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 512c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 513c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (!si->has_DT_SYMBOLIC) { 514ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s", 51561a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 516d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov s = soinfo_elf_lookup(somain, elf_hash, name, SymbolLookupScope::kExcludeLocal); 517c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 518c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 519c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 520c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 521c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5225ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 523c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Look for symbols in the local scope (the object who is 5244eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes * searching). This happens with C++ templates on x86 for some 525c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * reason. 526c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * 527c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Notes on weak symbols: 528c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * The ELF specs are ambiguous about treatment of weak definitions in 529c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * dynamic linking. Some systems return the first definition found 530c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * and some the first non-weak definition. This is system dependent. 531c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Here we return the first definition found for simplicity. */ 532c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 533d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov s = soinfo_elf_lookup(si, elf_hash, name, SymbolLookupScope::kAllowLocal); 534c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 535c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 536c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 537c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 538c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 539c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 540c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with -Bsymbolic and symbol is not found 541c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * in the local scope, try to find the symbol in the main executable. 542c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 543c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 544c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si->has_DT_SYMBOLIC) { 545ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s after local scope", 54661a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 547d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov s = soinfo_elf_lookup(somain, elf_hash, name, SymbolLookupScope::kExcludeLocal); 548c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 549c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 550c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 551c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 552c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5535ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 554d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 5556ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5564fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer /* Next, look for it in the preloads list */ 5571728b2396591853345507a063ed6075dfd251706Elliott Hughes for (int i = 0; g_ld_preloads[i] != NULL; i++) { 558d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name, SymbolLookupScope::kExcludeLocal); 559d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 5601728b2396591853345507a063ed6075dfd251706Elliott Hughes *lsi = g_ld_preloads[i]; 5614fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer goto done; 5625ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5634fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 5644fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 565d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; needed[i] != NULL; i++) { 566ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in %s", 56761a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, needed[i]->name); 568d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov s = soinfo_elf_lookup(needed[i], elf_hash, name, SymbolLookupScope::kExcludeLocal); 5695ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 5705ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel *lsi = needed[i]; 57112c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel goto done; 5725ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5736ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5746ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5756ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchevdone: 576d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 577c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " 578c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes "found in %s, base = %p, load bias = %p", 579c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->name, name, reinterpret_cast<void*>(s->st_value), 580c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), 581c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>((*lsi)->load_bias)); 5826ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev return s; 5836ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5846ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 585943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan return NULL; 5866ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev} 5876ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 588d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3). It performs symbol lookup only within the 5896ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev specified soinfo object and not in any of its dependencies. 590d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 591d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom TODO: Only looking in the specified soinfo seems wrong. dlsym(3) says 592d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom that it should do a breadth first search through the dependency 593d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom tree. This agrees with the ELF spec (aka System V Application 594d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Binary Interface) where in Chapter 5 it discuss resolving "Shared 595d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Object Dependencies" in breadth first search order. 5966ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 597d97e9f546ea195686a78e539315b273393609b9eDmitriy IvanovElfW(Sym)* dlsym_handle_lookup(soinfo* si, const char* name, soinfo* caller) { 598d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov return soinfo_elf_lookup(si, elfhash(name), name, 599d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov caller == si ? SymbolLookupScope::kAllowLocal : SymbolLookupScope::kExcludeLocal); 6001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 602d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3) to performs a global symbol lookup. If the 603d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom start value is null (for RTLD_DEFAULT), the search starts at the 604d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom beginning of the global solist. Otherwise the search starts at the 605d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom specified soinfo (for RTLD_NEXT). 6066ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 607d97e9f546ea195686a78e539315b273393609b9eDmitriy IvanovElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start, soinfo* caller) { 608cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes unsigned elf_hash = elfhash(name); 6091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 610cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (start == NULL) { 611cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes start = solist; 612cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6131698d9ebfc7e27271852a1fdf305a2ac37b3ebe4Matt Fischer 6140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 615cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { 616d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov s = soinfo_elf_lookup(si, elf_hash, name, 617d97e9f546ea195686a78e539315b273393609b9eDmitriy Ivanov caller == si ? SymbolLookupScope::kAllowLocal : SymbolLookupScope::kExcludeLocal); 618cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 619cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes *found = si; 620cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes break; 6211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 622cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 624cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 625c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", 626c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); 627cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 629cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return s; 6301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 632fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Chengsoinfo* find_containing_library(const void* p) { 6330266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) address = reinterpret_cast<ElfW(Addr)>(p); 634fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (soinfo* si = solist; si != NULL; si = si->next) { 635fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (address >= si->base && address - si->base < si->size) { 636fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return si; 637e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 638fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 639fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 640e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 641e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 6420266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dladdr_find_symbol(soinfo* si, const void* addr) { 6430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) soaddr = reinterpret_cast<ElfW(Addr)>(addr) - si->base; 644fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 645fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // Search the library's symbol table for any defined symbol which 646fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // contains this address. 647fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (size_t i = 0; i < si->nchain; ++i) { 6480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = &si->symtab[i]; 649fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (sym->st_shndx != SHN_UNDEF && 650fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr >= sym->st_value && 651fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr < sym->st_value + sym->st_size) { 652fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return sym; 653e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 654fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 655e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 656fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 657e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 658e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 659124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library_on_path(const char* name, const char* const paths[]) { 660124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes char buf[512]; 661124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes for (size_t i = 0; paths[i] != NULL; ++i) { 6621e980b6bc8315d00a07312b25486531247abd98cElliott Hughes int n = __libc_format_buffer(buf, sizeof(buf), "%s/%s", paths[i], name); 663124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (n < 0 || n >= static_cast<int>(sizeof(buf))) { 664ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); 665124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes continue; 6661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 667124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); 668124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd != -1) { 669124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 670124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 671124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 672124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return -1; 6731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 675124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library(const char* name) { 676ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ opening %s ]", name); 6771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 678124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // If the name contains a slash, we should attempt to open it directly and not search the paths. 679124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (strchr(name, '/') != NULL) { 6806971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); 6816971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes if (fd != -1) { 6826971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes return fd; 6836971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes } 6846971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. 6855ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#if defined(__LP64__) 686e43c4a7a665032a29cb5ec15d4adbf81ea199220Dmitriy Ivanov return -1; 6875ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#endif 688124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 6891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 690124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. 6911728b2396591853345507a063ed6075dfd251706Elliott Hughes int fd = open_library_on_path(name, g_ld_library_paths); 692124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd == -1) { 6931728b2396591853345507a063ed6075dfd251706Elliott Hughes fd = open_library_on_path(name, kDefaultLdPaths); 694124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 695124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 6961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 698b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* load_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { 69904dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov int fd = -1; 70004dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov ScopedFd file_guard(-1); 70104dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov 70204dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov if (extinfo != NULL && (extinfo->flags & ANDROID_DLEXT_USE_LIBRARY_FD) != 0) { 70304dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov fd = extinfo->library_fd; 70404dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov } else { 70504dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov // Open the file. 70604dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov fd = open_library(name); 70704dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov if (fd == -1) { 7084688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("library \"%s\" not found", name); 7091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 71004dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov } 71104dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov 71204dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov file_guard.reset(fd); 7132e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin } 7141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 715650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ElfReader elf_reader(name, fd); 716d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 717d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov struct stat file_stat; 718d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (TEMP_FAILURE_RETRY(fstat(fd, &file_stat)) != 0) { 719d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov DL_ERR("unable to stat file for the library %s: %s", name, strerror(errno)); 720d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return NULL; 721d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 722d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 723d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Check for symlink and other situations where 724d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // file can have different names. 725d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov for (soinfo* si = solist; si != NULL; si = si->next) { 726d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (si->get_st_dev() != 0 && 727d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_ino() != 0 && 728d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_dev() == file_stat.st_dev && 729d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_st_ino() == file_stat.st_ino) { 730d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("library \"%s\" is already loaded under different name/path \"%s\" - will return existing soinfo", name, si->name); 731d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return si; 732d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 733d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 734d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 735b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if ((dlflags & RTLD_NOLOAD) != 0) { 736b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov return NULL; 737b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 738b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 739d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Read the ELF header and load the segments. 74012bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) if (!elf_reader.Load(extinfo)) { 7414688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 74223363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 74323363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner 744489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov soinfo* si = soinfo_alloc(SEARCH_NAME(name), &file_stat); 745650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (si == NULL) { 7464688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 74723363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 748650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->base = elf_reader.load_start(); 749650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->size = elf_reader.load_size(); 750650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->load_bias = elf_reader.load_bias(); 751650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phnum = elf_reader.phdr_count(); 752650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phdr = elf_reader.loaded_phdr(); 753d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 754d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // At this point we know that whatever is loaded @ base is a valid ELF 755d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // shared library whose segments are properly mapped in. 75604dc91ae763adc403a14c88b4c46f77b3d2d71a3Dmitriy Ivanov TRACE("[ load_library base=%p size=%zu name='%s' ]", 757d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov reinterpret_cast<void*>(si->base), si->size, si->name); 758d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 759d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (!soinfo_link_image(si, extinfo)) { 760d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo_free(si); 761d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return NULL; 762d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 763d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 764650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return si; 7651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 767489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanovstatic soinfo *find_loaded_library_by_name(const char* name) { 768489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov const char* search_name = SEARCH_NAME(name); 769489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov for (soinfo* si = solist; si != NULL; si = si->next) { 770489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov if (!strcmp(search_name, si->name)) { 771489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return si; 77212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 773489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov } 774489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov return NULL; 77512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel} 77612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 777b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* find_library_internal(const char* name, int dlflags, const android_dlextinfo* extinfo) { 778d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (name == NULL) { 779d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return somain; 780d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 781d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 782489e498434f53269c44e3c13039eb630e86e1fd9Dmitriy Ivanov soinfo* si = find_loaded_library_by_name(name); 783b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 784b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Library might still be loaded, the accurate detection 785b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // of this fact is done by load_library 786b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (si == NULL) { 787b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov TRACE("[ '%s' has not been found by name. Trying harder...]", name); 788b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov si = load_library(name, dlflags, extinfo); 789b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 790b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 791b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (si != NULL && (si->flags & FLAG_LINKED) == 0) { 792b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov DL_ERR("recursive link to \"%s\"", si->name); 793d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return NULL; 794d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 79512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 796b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov return si; 797d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 798d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 799b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic soinfo* find_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { 800b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* si = find_library_internal(name, dlflags, extinfo); 801d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 802ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count++; 803d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 804d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 805d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 806d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 807b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovstatic void soinfo_unload(soinfo* si) { 808ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (si->ref_count == 1) { 809ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("unloading '%s'", si->name); 810d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallDestructors(); 811d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 812d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((si->flags | FLAG_NEW_SOINFO) != 0) { 813d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->get_children().for_each([&] (soinfo* child) { 814d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("%s needs to unload %s", si->name, child->name); 815d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo_unload(child); 816d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 817d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } else { 818d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 819d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if (d->d_tag == DT_NEEDED) { 820d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov const char* library_name = si->strtab + d->d_un.d_val; 821d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov TRACE("%s needs to unload %s", si->name, library_name); 822b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* needed = find_library(library_name, RTLD_NOLOAD, NULL); 823b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if (needed != NULL) { 824b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo_unload(needed); 825b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } else { 826b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Not found: for example if symlink was deleted between dlopen and dlclose 827b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // Since we cannot really handle errors at this point - print and continue. 828b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov PRINT("warning: couldn't find %s needed by %s on unload.", library_name, si->name); 829b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov } 830d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 831d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 8321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 8331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 834d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes notify_gdb_of_unload(si); 835ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 0; 836d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov soinfo_free(si); 837d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } else { 838ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count--; 839c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("not unloading '%s', decrementing ref_count to %zd", si->name, si->ref_count); 840d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 8411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 843a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesvoid do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 8441728b2396591853345507a063ed6075dfd251706Elliott Hughes snprintf(buffer, buffer_size, "%s:%s", kDefaultLdPaths[0], kDefaultLdPaths[1]); 845a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes} 846a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 847cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesvoid do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 848cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (!get_AT_SECURE()) { 849cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_LD_LIBRARY_PATH(ld_library_path); 850cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 851cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 852cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 8531a586293400d0e1d73e6eb82f7dfe9d2d9ed3c4bElliott Hughessoinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) { 854b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL|RTLD_NOLOAD)) != 0) { 855e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes DL_ERR("invalid flags to dlopen: %x", flags); 856e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes return NULL; 857e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes } 858012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) { 859d38306694179962f2d784fd1828afd4af1d8a4ecDmitriy Ivanov DL_ERR("invalid extended flags to android_dlopen_ext: %x", extinfo->flags); 860012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) return NULL; 861012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) } 862d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 863b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* si = find_library(name, flags, extinfo); 864d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 865d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 866d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 867d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 868d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 869d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 8701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 871b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanovvoid do_dlclose(soinfo* si) { 872d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 873b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo_unload(si); 874d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 8751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 8774eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 8789918665a45095ad135576f005c0e5307feb366a1Chris Dearmanstatic int soinfo_relocate(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) { 8790266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 880c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes soinfo* lsi; 881c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 882c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rela) { 8830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rela->r_info); 8840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rela->r_info); 8850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rela->r_offset + si->load_bias); 8860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 887faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 888c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 889c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 890c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (type == 0) { // R_*_NONE 891c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes continue; 892c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 893c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym != 0) { 894c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 895c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = soinfo_do_lookup(si, sym_name, &lsi, needed); 896c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (s == NULL) { 897c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We only allow an undefined symbol if this is a weak reference... 898c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 899c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 900c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 901c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 902c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 903c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 904c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes /* IHI0044C AAELF 4.5.1.1: 905c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 906c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Libraries are not searched to resolve weak references. 907c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes It is not an error for a weak reference to remain unsatisfied. 908c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 909c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes During linking, the value of an undefined weak reference is: 910c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - Zero if the relocation type is absolute 911c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of the place if the relocation is pc-relative 912c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of nominal base address if the relocation 913c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes type is base-relative. 914c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes */ 915c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 916c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 917e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 918e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 919e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 920e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 921e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 922e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 923e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 924e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 925e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * The sym_addr was initialized to be zero above, or the relocation 926e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * code below does not care about value of sym_addr. 927e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * No need to do anything. 928e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 929e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 930e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 931c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 932c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 933c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 934bb5bb2046fa0759d94995cbfb4f41137cd0b2a91Pavel Chupin case R_X86_64_64: 935c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 936c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // No need to do anything. 937c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 938c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 939c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_addr = reloc; 940c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 9414eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 942c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 943faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rela, idx); 944c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 945c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 946c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 947c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We got a definition. 9480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 949c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 950c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocSymbol); 951c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 952c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = NULL; 953c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 954c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 955c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 956e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 957e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 958e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 959e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %16llx <- %16llx %s\n", 9610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 963e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 964e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 965e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 966e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %16llx <- %16llx %s\n", 9680266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9690266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 970e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 971e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 972e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 973e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9740266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS64 %16llx <- %16llx %s\n", 9750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 977e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 978e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 979e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 980e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9810266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS32 %16llx <- %16llx %s\n", 9820266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 9840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 9850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 986e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 9890266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 9900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 991e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 992e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 993e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 994e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 995e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 996e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9970266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS16 %16llx <- %16llx %s\n", 9980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 10000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 10010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 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)), 10050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 10060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 1007e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1008e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1009e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1010e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL64: 1011e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1012e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10130266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL64 %16llx <- %16llx - %16llx %s\n", 10140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend) - rela->r_offset; 1016e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1017e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL32: 1018e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1019e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %16llx <- %16llx - %16llx %s\n", 10210266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 10230266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 10240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1025e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10260266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10270266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 10280266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 10290266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 1030e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1031e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1032e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1033e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL16: 1034e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1035e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 10360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL16 %16llx <- %16llx - %16llx %s\n", 10370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 10390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 10400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1041e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 10440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 10450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 1046e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1047e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1048e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1049e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1050e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 1051e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1052e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1053e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (sym) { 1054e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("odd RELATIVE form..."); 1055e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1056e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 10570266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %16llx <- %16llx\n", 10580266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (si->base + rela->r_addend)); 10590266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (si->base + rela->r_addend); 1060e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1061e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1062e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_COPY: 106376e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich /* 106476e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * ET_EXEC is not supported so this should not happen. 106576e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 106676e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 106776e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 106876e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 106976e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * R_AARCH64_COPY may only appear in executable objects where e_type is 107076e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * set to ET_EXEC. 107176e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich */ 107276e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich DL_ERR("%s R_AARCH64_COPY relocations are not supported", si->name); 107376e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich return -1; 1074e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_TPREL64: 10750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16llx <- %16llx - %16llx\n", 10760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1077e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1078e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_DTPREL32: 10790266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16llx <- %16llx - %16llx\n", 10800266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1081e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1082e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 1083c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 1084c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1085c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1086c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1087c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 10880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1089c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1090c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 1091c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1092c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1093c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1094c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 10950266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1096c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1097c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 1098c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1099c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1100c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym) { 1101c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("odd RELATIVE form..."); 1102c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1103c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1104c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), 1105c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(si->base)); 11060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = si->base + rela->r_addend; 1107c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1108c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 1109c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1110c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1111c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1112c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), sym_name); 11130266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1114c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1115c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin case R_X86_64_64: 1116c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin count_relocation(kRelocRelative); 1117c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin MARK(rela->r_offset); 1118c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1119c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin static_cast<size_t>(sym_addr), sym_name); 11200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1121c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin break; 1122c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 1123c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1124c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1125c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", 1126c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), 1127c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), static_cast<size_t>(reloc), sym_name); 11280266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend - reloc; 1129c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 11304eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1131e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1132c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 1133faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rela, idx); 1134c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1135c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1136c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1137c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return 0; 1138c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes} 11399918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11409918665a45095ad135576f005c0e5307feb366a1Chris Dearman#else // REL, not RELA. 11419918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic int soinfo_relocate(soinfo* si, ElfW(Rel)* rel, unsigned count, soinfo* needed[]) { 11430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 1144d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 11451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 11464688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rel) { 11470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rel->r_info); 11480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes // TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead. 11490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rel->r_info); 11500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + si->load_bias); 11510266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 1152faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 11531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1154c620059479c47a78d57086d73726c9adc2f337adElliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 1155d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (type == 0) { // R_*_NONE 1156d7daacb46372132ae3f0121647074936c304b572Raghu Gandham continue; 1157d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1158d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (sym != 0) { 1159c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 11605ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1161d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s == NULL) { 11624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We only allow an undefined symbol if this is a weak reference... 1163c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 1164c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 1165e9b6fc6f82276188404a2839e31a2f4c19f6c336Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 1166e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1167e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1168e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1169e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan /* IHI0044C AAELF 4.5.1.1: 1170e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1171e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan Libraries are not searched to resolve weak references. 1172e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan It is not an error for a weak reference to remain 1173e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan unsatisfied. 1174e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1175e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan During linking, the value of an undefined weak reference is: 1176e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - Zero if the relocation type is absolute 1177e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - The address of the place if the relocation is pc-relative 1178bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes - The address of nominal base address if the relocation 1179e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan type is base-relative. 1180e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan */ 1181e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1182e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan switch (type) { 11834eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1184e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_JUMP_SLOT: 1185e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_GLOB_DAT: 1186e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_ABS32: 1187e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_RELATIVE: /* Don't care. */ 11884eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 11894eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 11904eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 11914eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 11924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 1193d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case R_386_JMP_SLOT: 1194e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_GLOB_DAT: 1195e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_32: 1196c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_386_RELATIVE: /* Don't care. */ 11974eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 11984eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 11994eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 1200e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 1201e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_PC32: 1202e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan sym_addr = reloc; 1203e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 12044eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1205e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 12064eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1207e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_COPY: 12084eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // Fall through. Can't really copy if weak symbol is not found at run-time. 12094eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1210e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan default: 1211faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rel, idx); 1212e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1213e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1214e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } else { 12154eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We got a definition. 12160266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 1217d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1218bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocSymbol); 12191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1220e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan s = NULL; 12211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 12221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1223c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 12244eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 12251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_JUMP_SLOT: 1226bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1228ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 12290266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_GLOB_DAT: 1232bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1234ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 12350266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_ABS32: 1238bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1240ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO ABS %08x <- %08x %s", reloc, sym_addr, sym_name); 12410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 124334ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner case R_ARM_REL32: 1244bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocRelative); 124534ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner MARK(rel->r_offset); 1246ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", 124734ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner reloc, sym_addr, rel->r_offset, sym_name); 12480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr - rel->r_offset; 124934ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner break; 12501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_COPY: 125176e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich /* 125276e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * ET_EXEC is not supported so this should not happen. 125376e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 125476e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 125576e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * 125676e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 125776e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * R_ARM_COPY may only appear in executable objects where e_type is 125876e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich * set to ET_EXEC. 125976e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich */ 126076e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich DL_ERR("%s R_ARM_COPY relocations are not supported", si->name); 126176e289c026f11126fc88841b3019fd5bb419bb67Nick Kralevich return -1; 12624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 12634eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_JMP_SLOT: 12644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12654eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 12670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12684eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12694eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_GLOB_DAT: 12704eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12714eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12724eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 12730266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12744eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_32: 12764eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 12774eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12784eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_32 %08x <- +%08x %s", reloc, sym_addr, sym_name); 12790266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12804eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_PC32: 12824eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 12834eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12844eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", 12854eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); 12860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr - reloc); 12874eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12884eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__mips__) 12894eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_MIPS_REL32: 12909918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__LP64__) 12919918665a45095ad135576f005c0e5307feb366a1Chris Dearman // MIPS Elf64_Rel entries contain compound relocations 12929918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case 12939918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || 12949918665a45095ad135576f005c0e5307feb366a1Chris Dearman ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { 1295faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)", 12969918665a45095ad135576f005c0e5307feb366a1Chris Dearman type, (unsigned)ELF64_R_TYPE2(rel->r_info), 1297faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (unsigned)ELF64_R_TYPE3(rel->r_info), rel, idx); 12989918665a45095ad135576f005c0e5307feb366a1Chris Dearman return -1; 12999918665a45095ad135576f005c0e5307feb366a1Chris Dearman } 13009918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 13014eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13024eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13039918665a45095ad135576f005c0e5307feb366a1Chris Dearman TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), 13049918665a45095ad135576f005c0e5307feb366a1Chris Dearman static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); 13054eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (s) { 13060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 13074eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } else { 13080266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 13094eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13104eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13114eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13124eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes 13134eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 13144eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_ARM_RELATIVE: 13154eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 13164eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_RELATIVE: 13174eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13184eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13194eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13204eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (sym) { 13214eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("odd RELATIVE form..."); 13224eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes return -1; 13234eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13244eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", 13254eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); 13260266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 13274eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project default: 1330faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx); 13311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 13321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 13351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1336c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 13371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13384eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 133987c358524e479235aa6241736d2ce325f89daafcBrian Carlstromstatic bool mips_relocate_got(soinfo* si, soinfo* needed[]) { 13409918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Addr)** got = si->plt_got; 134187c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (got == NULL) { 134287c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 134387c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom } 134487c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned local_gotno = si->mips_local_gotno; 134587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned gotsym = si->mips_gotsym; 134687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned symtabno = si->mips_symtabno; 13470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 1348d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 13499918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[0] is the address of the lazy resolver function. 13509918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[1] may be used for a GNU extension. 13519918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start). 13529918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: maybe this should be in a separate routine? 1353d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if ((si->flags & FLAG_LINKER) == 0) { 135487c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom size_t g = 0; 13559918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef); 13569918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (reinterpret_cast<intptr_t>(got[g]) < 0) { 13579918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed); 1358d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 13599918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Relocate the local GOT entries. 1360d7daacb46372132ae3f0121647074936c304b572Raghu Gandham for (; g < local_gotno; g++) { 13619918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + si->load_bias); 1362d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1363d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1364d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 13659918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Now for the global GOT entries... 13660266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = symtab + gotsym; 1367d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got = si->plt_got + local_gotno; 136887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { 13699918665a45095ad135576f005c0e5307feb366a1Chris Dearman // This is an undefined reference... try to locate it. 13709918665a45095ad135576f005c0e5307feb366a1Chris Dearman const char* sym_name = si->strtab + sym->st_name; 1371d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 13729918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1373d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (s == NULL) { 13749918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only allow an undefined symbol if this is a weak reference. 1375d7daacb46372132ae3f0121647074936c304b572Raghu Gandham s = &symtab[g]; 1376c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 13774688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot locate \"%s\"...", sym_name); 137887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return false; 1379d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1380d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *got = 0; 13819918665a45095ad135576f005c0e5307feb366a1Chris Dearman } else { 13829918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: is this sufficient? 13839918665a45095ad135576f005c0e5307feb366a1Chris Dearman // For reference see NetBSD link loader 13849918665a45095ad135576f005c0e5307feb366a1Chris 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 13859918665a45095ad135576f005c0e5307feb366a1Chris Dearman *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value); 1386d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1387d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 138887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 1389d7daacb46372132ae3f0121647074936c304b572Raghu Gandham} 1390d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1391d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1392812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallArray(const char* array_name __unused, linker_function_t* functions, size_t count, bool reverse) { 1393ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (functions == NULL) { 1394d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1395d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 13968215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1397c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("[ Calling %s (size %zd) @ %p for '%s' ]", array_name, count, functions, name); 13988215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1399ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int begin = reverse ? (count - 1) : 0; 1400ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int end = reverse ? -1 : count; 1401ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int step = reverse ? -1 : 1; 14028215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1403ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (int i = begin; i != end; i += step) { 1404ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); 1405ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes CallFunction("function", functions[i]); 1406d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1407d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1408ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s for '%s' ]", array_name, name); 14091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 14101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1411812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallFunction(const char* function_name __unused, linker_function_t function) { 1412db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) { 1413d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1414d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1415d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1416ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); 1417d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes function(); 1418ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); 1419db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes 1420db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures 1421db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // are still writable. This happens with our debug malloc (see http://b/7941716). 1422d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ | PROT_WRITE); 14239181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov} 14249181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 1425d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallPreInitConstructors() { 14268147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_PREINIT_ARRAY functions are called before any other constructors for executables, 14278147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // but ignored in a shared library. 1428d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); 1429d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 1430e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1431d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallConstructors() { 1432d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (constructors_called) { 1433d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1434d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1435e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1436d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // We set constructors_called before actually calling the constructors, otherwise it doesn't 1437d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // protect against recursive constructor calls. One simple example of constructor recursion 1438d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: 1439d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 1. The program depends on libc, so libc's constructor is called here. 1440d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. 1441d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 3. dlopen() calls the constructors on the newly created 1442d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // soinfo for libc_malloc_debug_leak.so. 1443d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 4. The debug .so depends on libc, so CallConstructors is 1444d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // called again with the libc soinfo. If it doesn't trigger the early- 1445d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // out above, the libc constructor will be called again (recursively!). 1446d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes constructors_called = true; 1447d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 14488147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { 14498147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // The GNU dynamic linker silently ignores these, but we warn the developer. 1450c620059479c47a78d57086d73726c9adc2f337adElliott Hughes PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", 14518147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes name, preinit_array_count); 1452d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1454d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov get_children().for_each([] (soinfo* si) { 1455d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->CallConstructors(); 1456d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 14571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14588147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors", name); 14598147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14608147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_INIT should be called before DT_INIT_ARRAY if both are present. 1461d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_INIT", init_func); 1462d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); 1463e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov} 14648215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1465d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallDestructors() { 14668147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling destructors", name); 14678147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14688147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI_ARRAY must be parsed in reverse order. 1469d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); 14708147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14718147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI should be called after DT_FINI_ARRAY if both are present. 1472d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_FINI", fini_func); 1473b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov 1474b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // This is needed on second call to dlopen 1475b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov // after library has been unloaded with RTLD_NODELETE 1476b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov constructors_called = false; 14771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 14781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1479d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::add_child(soinfo* child) { 1480d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1481d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1482d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1483d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1484d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov this->children.push_front(child); 1485d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov child->parents.push_front(this); 1486d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1487d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1488d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::remove_all_links() { 1489d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1490d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1491d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1492d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1493d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // 1. Untie connected soinfos from 'this'. 1494d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov children.for_each([&] (soinfo* child) { 1495d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov child->parents.remove_if([&] (const soinfo* parent) { 1496d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return parent == this; 1497d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1498d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1499d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1500d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parents.for_each([&] (soinfo* parent) { 1501d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parent->children.for_each([&] (const soinfo* child) { 1502d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return child == this; 1503d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1504d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov }); 1505d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1506d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // 2. Once everything untied - clear local lists. 1507d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov parents.clear(); 1508d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov children.clear(); 1509d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1510d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1511d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::set_st_dev(dev_t dev) { 1512d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1513d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1514d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1515d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1516d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov st_dev = dev; 1517d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1518d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1519d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovvoid soinfo::set_st_ino(ino_t ino) { 1520d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1521d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return; 1522d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1523d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1524d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov st_ino = ino; 1525d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1526d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1527d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovdev_t soinfo::get_st_dev() { 1528d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1529d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return 0; 1530d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1531d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1532d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return st_dev; 1533d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov}; 1534d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1535d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovino_t soinfo::get_st_ino() { 1536d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1537d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return 0; 1538d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1539d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1540d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return st_ino; 1541d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1542d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1543d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov// This is a return on get_children() in case 1544d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov// 'this->flags' does not have FLAG_NEW_SOINFO set. 1545d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo::soinfo_list_t g_empty_list; 1546d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1547d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovsoinfo::soinfo_list_t& soinfo::get_children() { 1548d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov if ((this->flags & FLAG_NEW_SOINFO) == 0) { 1549d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return g_empty_list; 1550d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov } 1551d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1552d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov return this->children; 1553d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 1554d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 15551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Force any of the closed stdin, stdout and stderr to be associated with 15561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /dev/null. */ 15575419b9474753d25dff947c7740532f86d130c0beElliott Hughesstatic int nullify_closed_stdio() { 15581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int dev_null, i, status; 15591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int return_value = 0; 15601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 156116084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR)); 15621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null < 0) { 15634688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot open /dev/null: %s", strerror(errno)); 15641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 15651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1566ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); 15671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If any of the stdio file descriptors is valid and not associated 15691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project with /dev/null, dup /dev/null to it. */ 15701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for (i = 0; i < 3; i++) { 15711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If it is /dev/null already, we are done. */ 15724688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (i == dev_null) { 15731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 15744688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 15751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1576ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Nullifying stdio file descriptor %d]", i); 15774688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); 15781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15794688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes /* If file is opened, we are good. */ 15804688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status != -1) { 15814688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes continue; 15824688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 15831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* The only error we allow is that the file descriptor does not 15851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project exist, in which case we dup /dev/null to it. */ 15861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (errno != EBADF) { 15874688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("fcntl failed: %s", strerror(errno)); 15881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 15891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 15901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Try dupping /dev/null to this stdio file descriptor and 15931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project repeat if there is a signal. Note that any errors in closing 15941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project the stdio descriptor are lost. */ 15954688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); 15961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (status < 0) { 15974688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("dup2 failed: %s", strerror(errno)); 15981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 15991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If /dev/null is not one of the stdio file descriptors, close it. */ 16041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null > 2) { 1605ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); 16064688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(close(dev_null)); 16074688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status == -1) { 16084688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("close failed: %s", strerror(errno)); 16091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return return_value; 16141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 16151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1616183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo) { 1617f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee /* "base" might wrap around UINT32_MAX. */ 16180266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) base = si->load_bias; 16190266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr = si->phdr; 16201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int phnum = si->phnum; 1621d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom bool relocating_linker = (si->flags & FLAG_LINKER) != 0; 16221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1623b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can't debug anything until the linker is relocated */ 1624b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1625ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ linking %s ]", si->name); 1626c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p si->flags = 0x%08x", reinterpret_cast<void*>(si->base), si->flags); 1627b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 16281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 162963f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner /* Extract dynamic section */ 1630124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes size_t dynamic_count; 16310266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Word) dynamic_flags; 163212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, 1633cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman &dynamic_count, &dynamic_flags); 163463f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner if (si->dynamic == NULL) { 1635b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1636124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); 1637b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 1638124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 163963f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } else { 1640b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1641ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("dynamic = %p", si->dynamic); 1642b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 164363f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } 164463f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 16454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 164663f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner (void) phdr_table_get_arm_exidx(phdr, phnum, base, 164763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner &si->ARM_exidx, &si->ARM_exidx_count); 164863f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner#endif 164963f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 16508147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // Extract useful information from dynamic section. 1651d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom uint32_t needed_count = 0; 16520266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1653c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", 1654c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1655c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (d->d_tag) { 16561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_HASH: 1657faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nbucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[0]; 1658faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nchain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[1]; 1659faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->bucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8); 1660faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->chain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8 + si->nbucket * 4); 16611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_STRTAB: 1663faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->strtab = reinterpret_cast<const char*>(base + d->d_un.d_ptr); 16641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_SYMTAB: 1666faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->symtab = reinterpret_cast<ElfW(Sym)*>(base + d->d_un.d_ptr); 16671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16684eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if !defined(__LP64__) 16691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTREL: 1670d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val != DT_REL) { 1671124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1672124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 16731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1675c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_JMPREL: 16774eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1678faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1679c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1680faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1681c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTRELSZ: 16844eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 16850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1686c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 16870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1688c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16909918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__mips__) 16911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTGOT: 16929918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Used by mips and mips64. 16939918665a45095ad135576f005c0e5307feb366a1Chris Dearman si->plt_got = reinterpret_cast<ElfW(Addr)**>(base + d->d_un.d_ptr); 16941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1695c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_DEBUG: 1697bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_DEBUG entry to the address of _r_debug for GDB 1698cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman // if the dynamic table is writable 16999918665a45095ad135576f005c0e5307feb366a1Chris Dearman// FIXME: not working currently for N64 17009918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The flags for the LOAD and DYNAMIC program headers do not agree. 17019918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The LOAD section containng the dynamic table has been mapped as 17029918665a45095ad135576f005c0e5307feb366a1Chris Dearman// read-only, but the DYNAMIC header claims it is writable. 17039918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if !(defined(__mips__) && defined(__LP64__)) 170499c32055cb50443f722c55914869c1f6bb941959Elliott Hughes if ((dynamic_flags & PF_W) != 0) { 1705c620059479c47a78d57086d73726c9adc2f337adElliott Hughes d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); 170699c32055cb50443f722c55914869c1f6bb941959Elliott Hughes } 17071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17089918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 17094eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1710c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELA: 1711faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1712c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1713c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELASZ: 17140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1715c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1716c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1717c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_REL in \"%s\"", si->name); 1718c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1719c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 1720c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); 1721c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1722c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1723c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1724faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1725c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1726c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 17270266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1728c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1729ad13c57298e57d33c130fb03a2c6494da573408cShin-ichiro KAWASAKI case DT_RELA: 1730124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1731124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1732c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT: 1734ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17358147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT) found at %p", si->name, si->init_func); 17361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI: 1738ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17398147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI) found at %p", si->name, si->fini_func); 17401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAY: 1742ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17438147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT_ARRAY) found at %p", si->name, si->init_array); 17441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAYSZ: 17460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->init_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 17471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAY: 1749ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17508147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI_ARRAY) found at %p", si->name, si->fini_array); 17511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAYSZ: 17530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->fini_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 17541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAY: 1756ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->preinit_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17578147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_PREINIT_ARRAY) found at %p", si->name, si->preinit_array); 17581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAYSZ: 17600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 17611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_TEXTREL: 1763e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1764e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1765e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1766e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 17675135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->has_text_relocations = true; 17681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1769e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 17705ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_SYMBOLIC: 17715ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 17725ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 1773d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom case DT_NEEDED: 1774d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom ++needed_count; 1775d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom break; 17765ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_FLAGS: 1777d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_TEXTREL) { 1778e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1779e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1780e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1781e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 17825ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_text_relocations = true; 1783e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 17845ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 1785d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_SYMBOLIC) { 17865ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 17875ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 17885ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 17894eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 1790d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_STRSZ: 1791d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_SYMENT: 1792d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_RELENT: 1793d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1794d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_MAP: 1795bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB. 1796d7daacb46372132ae3f0121647074936c304b572Raghu Gandham { 1797006f9ad8910c945cd50e54f6c34d8c27b11c1193Benjamin Adolphi r_debug** dp = reinterpret_cast<r_debug**>(base + d->d_un.d_ptr); 1798d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *dp = &_r_debug; 1799d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1800d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1801d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_VERSION: 1802d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_FLAGS: 1803d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_BASE_ADDRESS: 1804d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_UNREFEXTNO: 1805d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1806d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1807d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_SYMTABNO: 1808d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_symtabno = d->d_un.d_val; 1809d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1810d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1811d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_LOCAL_GOTNO: 1812d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_local_gotno = d->d_un.d_val; 1813d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1814d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1815d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_GOTSYM: 1816d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_gotsym = d->d_un.d_val; 1817d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18184eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1819d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1820d7daacb46372132ae3f0121647074936c304b572Raghu Gandham default: 18214eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DEBUG("Unused DT entry: type %p arg %p", 18224eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1823d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1827c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", 1828c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->strtab, si->symtab); 18291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1830124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Sanity checks. 1831d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (relocating_linker && needed_count != 0) { 1832d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); 1833d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom return false; 1834d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 1835124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->nbucket == 0) { 1836124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); 1837124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1838124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1839124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->strtab == 0) { 1840124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); 1841124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1842124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1843124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->symtab == 0) { 1844124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); 1845124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 18487e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // If this is the main executable, then load all of the libraries from LD_PRELOAD now. 1849d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_EXE) { 18501728b2396591853345507a063ed6075dfd251706Elliott Hughes memset(g_ld_preloads, 0, sizeof(g_ld_preloads)); 18517e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes size_t preload_count = 0; 18521728b2396591853345507a063ed6075dfd251706Elliott Hughes for (size_t i = 0; g_ld_preload_names[i] != NULL; i++) { 1853b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* lsi = find_library(g_ld_preload_names[i], 0, NULL); 18547e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes if (lsi != NULL) { 18551728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads[preload_count++] = lsi; 18567e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes } else { 18577e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // As with glibc, failure to load an LD_PRELOAD library is just a warning. 18587e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", 18591728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preload_names[i], si->name, linker_get_error_buffer()); 18604fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 18614fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 18624fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 18634fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1864faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes soinfo** needed = reinterpret_cast<soinfo**>(alloca((1 + needed_count) * sizeof(soinfo*))); 1865d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo** pneeded = needed; 186612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 18670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1868d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1869d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 1870ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s needs %s", si->name, library_name); 1871b648a8a57ee42533a5bf127225a252f73ca2cbbcDmitriy Ivanov soinfo* lsi = find_library(library_name, 0, NULL); 1872d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (lsi == NULL) { 1873650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); 18744688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("could not load library \"%s\" needed by \"%s\"; caused by %s", 1875d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom library_name, si->name, tmp_err_buf); 1876124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1878d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 1879d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov si->add_child(lsi); 188012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded++ = lsi; 18811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 188312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded = NULL; 18841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1885e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 18865135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1887e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // Make segments writable to allow text relocations to work properly. We will later call 1888e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // phdr_table_protect_segments() after all of them are applied and all constructors are run. 18893d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich DL_WARN("%s has text relocations. This is wasting memory and prevents " 18903d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich "security hardening. Please fix.", si->name); 18915135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 18925135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't unprotect loadable segments for \"%s\": %s", 18935135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1894124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18955135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 18965135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 1897e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18985135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich 18994eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1900c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->plt_rela != NULL) { 1901faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]\n", si->name); 19029918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) { 1903c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1904c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1905c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1906c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->rela != NULL) { 1907faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]\n", si->name); 19089918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->rela, si->rela_count, needed)) { 1909c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1910c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1911c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1912c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1913d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->plt_rel != NULL) { 1914faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]", si->name); 1915d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { 1916124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1917124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1919d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->rel != NULL) { 1920faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]", si->name); 1921d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { 1922124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1923124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1925c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 19261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19274eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 192887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (!mips_relocate_got(si, needed)) { 1929124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1930d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1931d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1932d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 19331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_LINKED; 1934ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ finished linking %s ]", si->name); 19351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1936e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 19375135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1938e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // All relocations are done, we can protect our segments back to read-only. 19395135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 19405135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't protect segments for \"%s\": %s", 19415135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1942124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19435135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 19441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1945e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 19461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1947b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can also turn on GNU RELRO protection */ 1948b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) { 19494688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", 19504688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes si->name, strerror(errno)); 1951124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19529ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich } 19539ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich 1954183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) /* Handle serializing/sharing the RELRO segment */ 1955183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (extinfo && (extinfo->flags & ANDROID_DLEXT_WRITE_RELRO)) { 1956183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_serialize_gnu_relro(si->phdr, si->phnum, si->load_bias, 1957183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 1958183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed serializing GNU RELRO section for \"%s\": %s", 1959183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 1960183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 1961183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1962183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } else if (extinfo && (extinfo->flags & ANDROID_DLEXT_USE_RELRO)) { 1963183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_map_gnu_relro(si->phdr, si->phnum, si->load_bias, 1964183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 1965183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed mapping GNU RELRO section for \"%s\": %s", 1966183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 1967183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 1968183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1969183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1970183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 19711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project notify_gdb_of_load(si); 1972124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return true; 19731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 19741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1975468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 1976c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * This function add vdso to internal dso list. 1977c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * It helps to stack unwinding through signal handlers. 1978c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * Also, it makes bionic more like glibc. 1979c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov */ 1980812fd4263a005b88f3b4222baa910114f938d594Kito Chengstatic void add_vdso(KernelArgumentBlock& args __unused) { 19814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(AT_SYSINFO_EHDR) 19820266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(args.getauxval(AT_SYSINFO_EHDR)); 19830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (ehdr_vdso == NULL) { 19840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return; 19850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 1986c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 1987d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo* si = soinfo_alloc("[vdso]", NULL); 1988ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 19890266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); 19900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phnum = ehdr_vdso->e_phnum; 19910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(ehdr_vdso); 19920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->size = phdr_table_get_load_size(si->phdr, si->phnum); 19930266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = get_elf_exec_load_bias(ehdr_vdso); 1994ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 19950dcf06f976670b5d05286b184d150f61b71c1184Torne (Richard Coles) soinfo_link_image(si, NULL); 1996c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov#endif 1997c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov} 1998c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 1999c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov/* 2000d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * This is linker soinfo for GDB. See details below. 2001d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2002d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic soinfo linker_soinfo_for_gdb; 2003d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2004d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov/* gdb expects the linker to be in the debug shared object list. 2005d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Without this, gdb has trouble locating the linker's ".text" 2006d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * and ".plt" sections. Gdb could also potentially use this to 2007d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * relocate the offset of our exported 'rtld_db_dlactivity' symbol. 2008d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Don't use soinfo_alloc(), because the linker shouldn't 2009d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * be on the soinfo list. 2010d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2011d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanovstatic void init_linker_info_for_gdb(ElfW(Addr) linker_base) { 2012d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#if defined(__LP64__) 2013d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker64", sizeof(linker_soinfo_for_gdb.name)); 2014d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#else 2015d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker", sizeof(linker_soinfo_for_gdb.name)); 2016d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov#endif 2017d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov linker_soinfo_for_gdb.flags = FLAG_NEW_SOINFO; 2018d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov linker_soinfo_for_gdb.base = linker_base; 2019d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2020d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov /* 2021d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * Set the dynamic field in the link map otherwise gdb will complain with 2022d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * the following: 2023d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * warning: .dynamic section for "/system/bin/linker" is not at the 2024d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov * expected address (wrong library or version mismatch?) 2025d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov */ 2026d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_base); 2027d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_base + elf_hdr->e_phoff); 2028d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, 2029d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov &linker_soinfo_for_gdb.dynamic, NULL, NULL); 2030d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov insert_soinfo_into_debug_map(&linker_soinfo_for_gdb); 2031d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov} 2032d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 2033d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov/* 2034468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This code is called after the linker has linked itself and 2035468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * fixed it's own GOT. It is safe to make references to externs 2036468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * and other non-local data at this point. 2037468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 20380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(Addr) linker_base) { 203942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes /* NOTE: we store the args pointer on a special location 2040ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * of the temporary TLS area in order to pass it to 2041ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * the C Library's runtime initializer. 2042ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * 2043ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * The initializer must clear the slot and reset the TLS 2044ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * to point to a different location to ensure that no other 2045ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * shared library constructor can access it. 2046ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner */ 2047d3920b3a996b358e48232f417aa0a1e44a60f155Elliott Hughes __libc_init_tls(args); 20481a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov 20491a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#if TIMING 20501a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov struct timeval t0, t1; 20511a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov gettimeofday(&t0, 0); 20521a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#endif 20531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 205418a206c81d9743481e364384affd43306911283dElliott Hughes // Initialize environment functions, and get to the ELF aux vectors table. 205542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_env_init(args); 2056be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 20578d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // If this is a setuid/setgid program, close the security hole described in 20588d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc 20598d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich if (get_AT_SECURE()) { 20608d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich nullify_closed_stdio(); 20618d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich } 20628d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich 2063d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom debuggerd_init(); 20641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 206518a206c81d9743481e364384affd43306911283dElliott Hughes // Get a few environment variables. 206661a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes const char* LD_DEBUG = linker_env_get("LD_DEBUG"); 206761a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes if (LD_DEBUG != NULL) { 20681728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_debug_verbosity = atoi(LD_DEBUG); 206918a206c81d9743481e364384affd43306911283dElliott Hughes } 2070be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 207118a206c81d9743481e364384affd43306911283dElliott Hughes // Normally, these are cleaned by linker_env_init, but the test 207218a206c81d9743481e364384affd43306911283dElliott Hughes // doesn't cost us anything. 207318a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpath_env = NULL; 207418a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpreload_env = NULL; 207518a206c81d9743481e364384affd43306911283dElliott Hughes if (!get_AT_SECURE()) { 207618a206c81d9743481e364384affd43306911283dElliott Hughes ldpath_env = linker_env_get("LD_LIBRARY_PATH"); 207718a206c81d9743481e364384affd43306911283dElliott Hughes ldpreload_env = linker_env_get("LD_PRELOAD"); 20781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2080d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov // Linker does not call constructors for its own 2081d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov // global variables so we need to initialize 2082d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // the allocators explicitly. 20831728b2396591853345507a063ed6075dfd251706Elliott Hughes g_soinfo_allocator.init(); 2084d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov g_soinfo_links_allocator.init(); 2085d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov 2086ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ android linker & debugger ]"); 20871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2088d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov soinfo* si = soinfo_alloc(args.argv[0], NULL); 208918a206c81d9743481e364384affd43306911283dElliott Hughes if (si == NULL) { 209018a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 20911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2093d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* bootstrap the link map, the main exe always needs to be first */ 20941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_EXE; 20953a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(si->link_map_head); 20961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_addr = 0; 209842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes map->l_name = args.argv[0]; 20991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = NULL; 21001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = NULL; 21011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 21031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 21041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2105d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov init_linker_info_for_gdb(linker_base); 21061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 210742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Extract information passed from the kernel. 21080266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(args.getauxval(AT_PHDR)); 210942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->phnum = args.getauxval(AT_PHNUM); 211042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->entry = args.getauxval(AT_ENTRY); 21111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21128180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner /* Compute the value of si->base. We can't rely on the fact that 21138180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * the first entry is the PHDR because this will not be true 21148180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * for certain executables (e.g. some in the NDK unit test suite) 21158180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner */ 21168180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner si->base = 0; 2117b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner si->size = phdr_table_get_load_size(si->phdr, si->phnum); 2118bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner si->load_bias = 0; 2119ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (size_t i = 0; i < si->phnum; ++i) { 212042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes if (si->phdr[i].p_type == PT_PHDR) { 21210266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_vaddr; 21220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_offset; 212342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes break; 212442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 21258180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner } 2126d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->dynamic = NULL; 2127ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 1; 21281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21292aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base); 21302aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich if (elf_hdr->e_type != ET_DYN) { 21312aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n"); 21322aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich exit(EXIT_FAILURE); 21332aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich } 21342aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich 21354688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). 21364688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_LIBRARY_PATH(ldpath_env); 21374688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_PRELOAD(ldpreload_env); 21384fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 21395ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel somain = si; 21405ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 2141183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(si, NULL)) { 2142650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer()); 214318a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 21441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2146c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov add_vdso(args); 2147c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2148d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallPreInitConstructors(); 21499181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 21501728b2396591853345507a063ed6075dfd251706Elliott Hughes for (size_t i = 0; g_ld_preloads[i] != NULL; ++i) { 21511728b2396591853345507a063ed6075dfd251706Elliott Hughes g_ld_preloads[i]->CallConstructors(); 2152326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng } 2153326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng 2154d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* After the link_image, the si->load_bias is initialized. 2155d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * For so lib, the map->l_addr will be updated in notify_gdb_of_load. 2156d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * We need to update this value for so exe here. So Unwind_Backtrace 2157d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * for some arch like x86 could work correctly within so exe. 21589c3449ecd9d5e9cdb1e995e35e53334a4a288a5eXiaokang Qin */ 2159c5db969aa4a24a76fc0964f2ff89533e832b47a6Chao-Ying Fu map->l_addr = si->load_bias; 2160d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 2161e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 21621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING 2163faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes gettimeofday(&t1, NULL); 2164ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("LINKER TIME: %s: %d microseconds", args.argv[0], (int) ( 21651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - 2166faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec))); 21671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 2169ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol", args.argv[0], 2170bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocAbsolute], 2171bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocRelative], 2172bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocCopy], 2173bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocSymbol]); 21741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 21761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project { 21771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 21781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned i; 21791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = 0; 2180d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (n = 0; n < 4096; n++) { 2181d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (bitmask[n]) { 21821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned x = bitmask[n]; 2183e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 2184e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland for (i = 0; i < 32; i++) { 2185e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 2186d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (i = 0; i < 8; i++) { 2187e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 2188d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (x & 1) { 2189d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom count++; 2190d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 21911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project x >>= 1; 21921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2195ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("PAGES MODIFIED: %s: %d (%dKB)", args.argv[0], count, count * 4); 21961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING || STATS || COUNT_PAGES 22001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fflush(stdout); 22011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 22021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2203c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE("[ Ready to execute '%s' @ %p ]", si->name, reinterpret_cast<void*>(si->entry)); 22041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return si->entry; 22051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2206468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 2207bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner/* Compute the load-bias of an existing executable. This shall only 2208bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * be used to compute the load bias of an executable or shared library 2209bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * that was loaded by the kernel itself. 2210bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * 2211bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Input: 2212bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * elf -> address of ELF header, assumed to be at the start of the file. 2213bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Return: 2214bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * load bias, i.e. add the value of any p_vaddr in the file to get 2215bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * the corresponding address in memory. 2216bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner */ 22170266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) { 22180266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) offset = elf->e_phoff; 2219faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const ElfW(Phdr)* phdr_table = reinterpret_cast<const ElfW(Phdr)*>(reinterpret_cast<uintptr_t>(elf) + offset); 22200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr_end = phdr_table + elf->e_phnum; 2221fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 22220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (const ElfW(Phdr)* phdr = phdr_table; phdr < phdr_end; phdr++) { 2223fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (phdr->p_type == PT_LOAD) { 22240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return reinterpret_cast<ElfW(Addr)>(elf) + phdr->p_offset - phdr->p_vaddr; 2225bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner } 2226fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 2227fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return 0; 2228bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner} 2229bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner 2230468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2231468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This is the entry point for the linker, called from begin.S. This 2232468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * method is responsible for fixing the linker's own relocations, and 2233468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * then calling __linker_init_post_relocation(). 2234468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * 2235468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * Because this method is called before the linker has fixed it's own 2236468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * relocations, any attempt to reference an extern variable, extern 2237468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * function, or other GOT reference will generate a segfault. 2238468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 22390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesextern "C" ElfW(Addr) __linker_init(void* raw_args) { 2240d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov // Initialize static variables. 2241d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov solist = get_libdl_info(); 2242d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov sonext = get_libdl_info(); 2243d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov 224442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes KernelArgumentBlock args(raw_args); 224542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 22460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) linker_addr = args.getauxval(AT_BASE); 22470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr); 2248faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff); 224942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 225042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo linker_so; 225142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes memset(&linker_so, 0, sizeof(soinfo)); 225242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2253b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes strcpy(linker_so.name, "[dynamic linker]"); 225442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.base = linker_addr; 225542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); 225642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); 2257d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_so.dynamic = NULL; 225842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phdr = phdr; 225942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phnum = elf_hdr->e_phnum; 226042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.flags |= FLAG_LINKER; 226142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2262183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(&linker_so, NULL)) { 226342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // It would be nice to print an error message, but if the linker 226442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // can't link itself, there's no guarantee that we'll be able to 2265b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // call write() (because it involves a GOT reference). We may as 2266b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // well try though... 2267b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes const char* msg = "CANNOT LINK EXECUTABLE: "; 2268b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, msg, strlen(msg)); 2269b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); 2270b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, "\n", 1); 2271b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes _exit(EXIT_FAILURE); 227242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 2273468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 227442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // We have successfully fixed our own relocations. It's safe to run 227542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // the main part of the linker now. 22761728b2396591853345507a063ed6075dfd251706Elliott Hughes args.abort_message_ptr = &g_abort_message; 22770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) start_address = __linker_init_post_relocation(args, linker_addr); 22785419b9474753d25dff947c7740532f86d130c0beElliott Hughes 2279d59e50063ad708509f3ad83350be33f5612c4f54Dmitriy Ivanov protect_data(PROT_READ); 2280d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 228142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Return the address that the calling assembly stub should jump to. 228242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes return start_address; 2283468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich} 2284