linker.cpp revision a4aafd156068ee174012f28cd894dbecf0e4ab90
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> 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <linux/auxvec.h> 334688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <pthread.h> 34e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#include <stdint.h> 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdlib.h> 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <string.h> 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/atomics.h> 394688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/mman.h> 404688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/stat.h> 414688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <unistd.h> 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 434688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Private C library headers. 44eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/bionic_tls.h" 45eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/KernelArgumentBlock.h" 46eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/ScopedPthreadMutexLocker.h" 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker.h" 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker_debug.h" 50be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner#include "linker_environ.h" 5123363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner#include "linker_phdr.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 * - are we doing everything we should for ARM_COPY relocations? 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - cleaner error reporting 651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - after linking, set as much stuff as possible to READONLY 661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * and NOEXEC 674688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes */ 681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 69124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic bool soinfo_link_image(soinfo* si); 70ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikovstatic Elf_Addr get_elf_exec_load_bias(const Elf_Ehdr* elf); 711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 72ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// We can't use malloc(3) in the dynamic linker. We use a linked list of anonymous 73ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// maps, each a single page in size. The pages are broken up into as many struct soinfo 74ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// objects as will fit, and they're all threaded together on a free list. 75ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn#define SOINFO_PER_POOL ((PAGE_SIZE - sizeof(soinfo_pool_t*)) / sizeof(soinfo)) 76ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstruct soinfo_pool_t { 77ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo_pool_t* next; 78ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo info[SOINFO_PER_POOL]; 79ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn}; 80ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic struct soinfo_pool_t* gSoInfoPools = NULL; 81ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic soinfo* gSoInfoFreeList = NULL; 82ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 83d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* solist = &libdl_info; 84d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* sonext = &libdl_info; 85d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* somain; /* main process, always the one after libdl_info */ 861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 87a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesstatic const char* const gDefaultLdPaths[] = { 884eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 89011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/vendor/lib64", 90011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/system/lib64", 91011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#else 92124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/vendor/lib", 93124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/system/lib", 94011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#endif 95124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes NULL 96124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes}; 97124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes 98a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_BUFSIZE (LDPATH_MAX*64) 99a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_MAX 8 100a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 101a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_BUFSIZE (LDPRELOAD_MAX*64) 102a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_MAX 8 103a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 104124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic char gLdPathsBuffer[LDPATH_BUFSIZE]; 105124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic const char* gLdPaths[LDPATH_MAX + 1]; 106bc3a5c26f1b9cf29da6abfc3e197258ef4c03362David Bartley 107124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic char gLdPreloadsBuffer[LDPRELOAD_BUFSIZE]; 108124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic const char* gLdPreloadNames[LDPRELOAD_MAX + 1]; 1094fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 110d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* gLdPreloads[LDPRELOAD_MAX + 1]; 1114fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 112650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes__LIBC_HIDDEN__ int gLdDebugVerbosity; 1131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1140d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes__LIBC_HIDDEN__ abort_msg_t* gAbortMessage = NULL; // For debuggerd. 1150d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes 116bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesenum RelocationKind { 117bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocAbsolute = 0, 118bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocRelative, 119bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocCopy, 120bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocSymbol, 121bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocMax 122bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 123be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 1241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 125bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstruct linker_stats_t { 126bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes int count[kRelocMax]; 127bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 128bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 129bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic linker_stats_t linker_stats; 130bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 131bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind kind) { 132bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes ++linker_stats.count[kind]; 133bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 134bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 135bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind) { 136bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 1371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 140bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic unsigned bitmask[4096]; 141e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 142e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#define MARK(offset) \ 143e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland do { \ 144e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((((offset) >> 12) >> 5) < 4096) \ 145e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \ 146e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } while(0) 147e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 148bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(offset) \ 149bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes do { \ 150bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ 151bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } while(0) 152e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 153bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 154bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(x) do {} while (0) 1551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1574688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// You shouldn't try to call memory-allocating functions in the dynamic linker. 1584688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Guard against the most obvious ones. 1598f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes#define DISALLOW_ALLOCATION(return_type, name, ...) \ 1608f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes return_type name __VA_ARGS__ \ 1618f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes { \ 1624688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes const char* msg = "ERROR: " #name " called from the dynamic linker!\n"; \ 1638f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes __libc_format_log(ANDROID_LOG_FATAL, "linker", "%s", msg); \ 1648f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes write(2, msg, strlen(msg)); \ 1658f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes abort(); \ 1664688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 1674688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#define UNUSED __attribute__((unused)) 1684688279db5dcc4004941e7f133c4a1c3617d842cElliott HughesDISALLOW_ALLOCATION(void*, malloc, (size_t u UNUSED)); 1694688279db5dcc4004941e7f133c4a1c3617d842cElliott HughesDISALLOW_ALLOCATION(void, free, (void* u UNUSED)); 1704688279db5dcc4004941e7f133c4a1c3617d842cElliott HughesDISALLOW_ALLOCATION(void*, realloc, (void* u1 UNUSED, size_t u2 UNUSED)); 1714688279db5dcc4004941e7f133c4a1c3617d842cElliott HughesDISALLOW_ALLOCATION(void*, calloc, (size_t u1 UNUSED, size_t u2 UNUSED)); 1722e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 1730353195f344666256dba474a15c9ba22cf0cccc9Dima Zavinstatic char tmp_err_buf[768]; 1742e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavinstatic char __linker_dl_err_buf[768]; 1752e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 176650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hugheschar* linker_get_error_buffer() { 1775419b9474753d25dff947c7740532f86d130c0beElliott Hughes return &__linker_dl_err_buf[0]; 1782e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin} 1792e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 180650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughessize_t linker_get_error_buffer_size() { 181650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return sizeof(__linker_dl_err_buf); 182650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes} 183650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 1841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 1851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This function is an empty stub where GDB locates a breakpoint to get notified 1861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about linker activity. 1871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 1885419b9474753d25dff947c7740532f86d130c0beElliott Hughesextern "C" void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity(); 1891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1900d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughesstatic r_debug _r_debug = {1, NULL, &rtld_db_dlactivity, RT_CONSISTENT, 0}; 191ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughesstatic link_map_t* r_debug_tail = 0; 1921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1933b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughesstatic pthread_mutex_t gDebugMutex = PTHREAD_MUTEX_INITIALIZER; 1941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 195bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void insert_soinfo_into_debug_map(soinfo * info) { 196bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Copy the necessary fields into the debug structure. 197ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes link_map_t* map = &(info->link_map); 198ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov map->l_addr = info->load_bias; 1991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_name = (char*) info->name; 2005cf640c926e7d7b79934c97226433a3dc448e1ebThinker K.F Li map->l_ld = (uintptr_t)info->dynamic; 2011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Stick the new library at the end of the list. 2031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * gdb tends to care more about libc than it does 2041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about leaf libraries, and ordering it this way 2051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * reduces the back-and-forth over the wire. 2061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 2071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (r_debug_tail) { 2081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail->l_next = map; 2091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = r_debug_tail; 2101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 2121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 2131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = 0; 2141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 2171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 219bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void remove_soinfo_from_debug_map(soinfo* info) { 220ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes link_map_t* map = &(info->link_map); 2215e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 222bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (r_debug_tail == map) { 2235e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev r_debug_tail = map->l_prev; 224bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2255e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 226bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_prev) { 227bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_prev->l_next = map->l_next; 228bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 229bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_next) { 230bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_next->l_prev = map->l_prev; 231bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2325e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2335e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 234bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_load(soinfo* info) { 2351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (info->flags & FLAG_EXE) { 2361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project // GDB already knows about the main executable 2371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 2381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2403b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes ScopedPthreadMutexLocker locker(&gDebugMutex); 2411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_state = RT_ADD; 2431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project insert_soinfo_into_debug_map(info); 2461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_state = RT_CONSISTENT; 2481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2495e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2505e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 251bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_unload(soinfo* info) { 2525e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev if (info->flags & FLAG_EXE) { 2535e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev // GDB already knows about the main executable 2545e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev return; 2555e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev } 2565e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2573b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes ScopedPthreadMutexLocker locker(&gDebugMutex); 2585e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2595e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev _r_debug.r_state = RT_DELETE; 2605e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2615e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2625e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev remove_soinfo_from_debug_map(info); 2635e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2645e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev _r_debug.r_state = RT_CONSISTENT; 2655e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 26818a206c81d9743481e364384affd43306911283dElliott Hughesvoid notify_gdb_of_libraries() { 2691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_state = RT_ADD; 2701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_state = RT_CONSISTENT; 2721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 275ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic bool ensure_free_list_non_empty() { 276ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (gSoInfoFreeList != NULL) { 277ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return true; 278ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 279ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 280ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Allocate a new pool. 281ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo_pool_t* pool = reinterpret_cast<soinfo_pool_t*>(mmap(NULL, sizeof(*pool), 282ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn PROT_READ|PROT_WRITE, 283ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn MAP_PRIVATE|MAP_ANONYMOUS, 0, 0)); 284ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (pool == MAP_FAILED) { 285ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return false; 286ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 287ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 288ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Add the pool to our list of pools. 289ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn pool->next = gSoInfoPools; 290ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoPools = pool; 291ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 292ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Chain the entries in the new pool onto the free list. 293ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoFreeList = &pool->info[0]; 294ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo* next = NULL; 295ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn for (int i = SOINFO_PER_POOL - 1; i >= 0; --i) { 296ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn pool->info[i].next = next; 297ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn next = &pool->info[i]; 298ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 299ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 300ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return true; 301ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn} 3021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 303d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesstatic void set_soinfo_pool_protection(int protection) { 304d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes for (soinfo_pool_t* p = gSoInfoPools; p != NULL; p = p->next) { 305d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (mprotect(p, sizeof(*p), protection) == -1) { 306d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes abort(); // Can't happen. 307d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 308d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 309d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 310d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 311ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic soinfo* soinfo_alloc(const char* name) { 312ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (strlen(name) >= SOINFO_NAME_LEN) { 313ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("library name \"%s\" too long", name); 314ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 315ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 316ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 317ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (!ensure_free_list_non_empty()) { 318ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("out of memory when loading \"%s\"", name); 319ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 320ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 3211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 322ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Take the head element off the free list. 323ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo* si = gSoInfoFreeList; 324ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoFreeList = gSoInfoFreeList->next; 3251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 326ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Initialize the new element. 327ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn memset(si, 0, sizeof(soinfo)); 328ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn strlcpy(si->name, name, sizeof(si->name)); 329ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext->next = si; 330ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext = si; 3311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 332ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: allocated soinfo @ %p", name, si); 333ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return si; 3341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 3364688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughesstatic void soinfo_free(soinfo* si) 3371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 3384688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (si == NULL) { 3394688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return; 3404688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 3414688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *prev = NULL, *trav; 3431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 344ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: freeing soinfo @ %p", si->name, si); 3451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 346d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (trav = solist; trav != NULL; trav = trav->next) { 3471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == si) 3481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 3491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev = trav; 3501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == NULL) { 352d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* si was not in solist */ 3534688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("name \"%s\" is not in solist!", si->name); 3541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 3551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 357be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner /* prev will never be NULL, because the first entry in solist is 3581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project always the static libdl_info. 3591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 3601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev->next = si->next; 361d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si == sonext) { 362d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom sonext = prev; 363d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 364ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn si->next = gSoInfoFreeList; 365ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoFreeList = si; 3661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 368cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 369cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_path(const char* path, const char* delimiters, 370cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes const char** array, char* buf, size_t buf_size, size_t max_count) { 371cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (path == NULL) { 372cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return; 373cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 374cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 375cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t len = strlcpy(buf, path, buf_size); 376cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 377cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t i = 0; 378cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes char* buf_p = buf; 379cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { 380cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (*array[i] != '\0') { 381cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes ++i; 382cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 383cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 384cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 385cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // Forget the last path if we had to truncate; this occurs if the 2nd to 386cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // last char isn't '\0' (i.e. wasn't originally a delimiter). 387cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { 388cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i - 1] = NULL; 389cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } else { 390cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i] = NULL; 391cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 392cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 393cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 394cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_LIBRARY_PATH(const char* path) { 395cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_path(path, ":", gLdPaths, 396cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes gLdPathsBuffer, sizeof(gLdPathsBuffer), LDPATH_MAX); 397cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 398cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 399cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_PRELOAD(const char* path) { 400cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // We have historically supported ':' as well as ' ' in LD_PRELOAD. 401cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_path(path, " :", gLdPreloadNames, 402cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes gLdPreloadsBuffer, sizeof(gLdPreloadsBuffer), LDPRELOAD_MAX); 403cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 404cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 4054eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 4064688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* For a given PC, find the .so that it belongs to. 4081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Returns the base address of the .ARM.exidx section 4091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * for that .so, and the number of 8-byte entries 4101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * in that section (via *pcount). 4111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 4121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Intended to be called by libc's __gnu_Unwind_Find_exidx(). 4131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 4143b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes * This function is exposed via dlfcn.cpp and libdl.so. 4151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 4161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount) 4171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 4181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *si; 4191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned addr = (unsigned)pc; 4201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 421c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes for (si = solist; si != 0; si = si->next) { 422468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich if ((addr >= si->base) && (addr < (si->base + si->size))) { 423468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich *pcount = si->ARM_exidx_count; 424f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee return (_Unwind_Ptr)si->ARM_exidx; 4251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *pcount = 0; 4281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 4291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4304688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 43124053a461e7a20f34002262c1bb122023134989dChristopher Ferris#endif 4324688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Here, we only have to provide a callback to iterate across all the 4341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * loaded libraries. gcc_eh does the rest. */ 4351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint 436bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesdl_iterate_phdr(int (*cb)(dl_phdr_info *info, size_t size, void *data), 4371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project void *data) 4381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 4391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int rv = 0; 440bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 441bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes dl_phdr_info dl_info; 442ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes dl_info.dlpi_addr = si->link_map.l_addr; 443ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes dl_info.dlpi_name = si->link_map.l_name; 4441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phdr = si->phdr; 4451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phnum = si->phnum; 446bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes rv = cb(&dl_info, sizeof(dl_phdr_info), data); 447bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (rv != 0) { 4481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 449bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 4501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return rv; 4521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4534688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 454c620059479c47a78d57086d73726c9adc2f337adElliott Hughesstatic Elf_Sym* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) { 455c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* symtab = si->symtab; 456d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* strtab = si->strtab; 4571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 458c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", 459c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); 4601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4616bec5b792a5f034089a942cb28cab26d36408235Christopher Ferris for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { 462c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* s = symtab + n; 463d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (strcmp(strtab + s->st_name, name)) continue; 4641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 465e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan /* only concern ourselves with global and weak symbol definitions */ 466c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (ELF_ST_BIND(s->st_info)) { 4671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case STB_GLOBAL: 468e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case STB_WEAK: 469d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s->st_shndx == SHN_UNDEF) { 470439fa8ea8c33a7945258dfe84a71ab2665efaa9aRobin Burchell continue; 471d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 4721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 473c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", 474c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, si->name, reinterpret_cast<void*>(s->st_value), 475c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(s->st_size)); 4761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return s; 4771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 480943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan return NULL; 4811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 483d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic unsigned elfhash(const char* _name) { 484d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const unsigned char* name = (const unsigned char*) _name; 4851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned h = 0, g; 4861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project while(*name) { 4881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h = (h << 4) + *name++; 4891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project g = h & 0xf0000000; 4901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g; 4911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g >> 24; 4921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return h; 4941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 496c620059479c47a78d57086d73726c9adc2f337adElliott Hughesstatic Elf_Sym* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, soinfo* needed[]) { 497943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan unsigned elf_hash = elfhash(name); 498c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* s = NULL; 4996ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 500c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si != NULL && somain != NULL) { 5015ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 5025ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel /* 503c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Local scope is executable scope. Just start looking into it right away 504c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * for the shortcut. 5055ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel */ 5065ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 507c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si == somain) { 508c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 5095ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 510c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 5115ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel goto done; 5125ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 513c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } else { 514c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ 515c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 516c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 517c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with symbolic relocations disabled, the 518c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * first place to look to resolve external references is the main 519c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * executable. 520c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 521c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 522c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (!si->has_DT_SYMBOLIC) { 523ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s", 52461a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 525c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 526c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 527c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 528c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 529c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 530c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5315ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 532c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Look for symbols in the local scope (the object who is 5334eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes * searching). This happens with C++ templates on x86 for some 534c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * reason. 535c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * 536c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Notes on weak symbols: 537c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * The ELF specs are ambiguous about treatment of weak definitions in 538c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * dynamic linking. Some systems return the first definition found 539c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * and some the first non-weak definition. This is system dependent. 540c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Here we return the first definition found for simplicity. */ 541c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 542c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 543c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 544c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 545c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 546c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 547c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 548c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 549c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with -Bsymbolic and symbol is not found 550c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * in the local scope, try to find the symbol in the main executable. 551c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 552c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 553c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si->has_DT_SYMBOLIC) { 554ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s after local scope", 55561a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 556c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 557c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 558c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 559c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 560c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 561c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5625ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 563d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 5646ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5654fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer /* Next, look for it in the preloads list */ 566d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; gLdPreloads[i] != NULL; i++) { 567d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom s = soinfo_elf_lookup(gLdPreloads[i], elf_hash, name); 568d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 569d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom *lsi = gLdPreloads[i]; 5704fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer goto done; 5715ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5724fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 5734fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 574d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; needed[i] != NULL; i++) { 575ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in %s", 57661a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, needed[i]->name); 5775ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_elf_lookup(needed[i], elf_hash, name); 5785ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 5795ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel *lsi = needed[i]; 58012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel goto done; 5815ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5826ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5836ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5846ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchevdone: 585d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 586c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " 587c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes "found in %s, base = %p, load bias = %p", 588c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->name, name, reinterpret_cast<void*>(s->st_value), 589c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), 590c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>((*lsi)->load_bias)); 5916ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev return s; 5926ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5936ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 594943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan return NULL; 5956ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev} 5966ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 597d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3). It performs symbol lookup only within the 5986ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev specified soinfo object and not in any of its dependencies. 599d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 600d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom TODO: Only looking in the specified soinfo seems wrong. dlsym(3) says 601d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom that it should do a breadth first search through the dependency 602d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom tree. This agrees with the ELF spec (aka System V Application 603d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Binary Interface) where in Chapter 5 it discuss resolving "Shared 604d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Object Dependencies" in breadth first search order. 6056ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 606c620059479c47a78d57086d73726c9adc2f337adElliott HughesElf_Sym* dlsym_handle_lookup(soinfo* si, const char* name) { 60716084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner return soinfo_elf_lookup(si, elfhash(name), name); 6081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 610d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3) to performs a global symbol lookup. If the 611d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom start value is null (for RTLD_DEFAULT), the search starts at the 612d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom beginning of the global solist. Otherwise the search starts at the 613d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom specified soinfo (for RTLD_NEXT). 6146ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 615c620059479c47a78d57086d73726c9adc2f337adElliott HughesElf_Sym* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start) { 616cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes unsigned elf_hash = elfhash(name); 6171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 618cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (start == NULL) { 619cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes start = solist; 620cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6211698d9ebfc7e27271852a1fdf305a2ac37b3ebe4Matt Fischer 622c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* s = NULL; 623cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { 624cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes s = soinfo_elf_lookup(si, elf_hash, name); 625cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 626cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes *found = si; 627cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes break; 6281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 629cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 631cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 632c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", 633c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); 634cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 636cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return s; 6371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 639fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Chengsoinfo* find_containing_library(const void* p) { 640c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr address = reinterpret_cast<Elf_Addr>(p); 641fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (soinfo* si = solist; si != NULL; si = si->next) { 642fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (address >= si->base && address - si->base < si->size) { 643fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return si; 644e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 645fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 646fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 647e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 648e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 649c620059479c47a78d57086d73726c9adc2f337adElliott HughesElf_Sym* dladdr_find_symbol(soinfo* si, const void* addr) { 650c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr soaddr = reinterpret_cast<Elf_Addr>(addr) - si->base; 651fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 652fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // Search the library's symbol table for any defined symbol which 653fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // contains this address. 654fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (size_t i = 0; i < si->nchain; ++i) { 655c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* sym = &si->symtab[i]; 656fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (sym->st_shndx != SHN_UNDEF && 657fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr >= sym->st_value && 658fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr < sym->st_value + sym->st_size) { 659fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return sym; 660e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 661fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 662e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 663fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 664e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 665e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 6661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if 0 667d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic void dump(soinfo* si) 6681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 669c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* s = si->symtab; 670d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (unsigned n = 0; n < si->nchain; n++) { 671ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("%04d> %08x: %02x %04x %08x %08x %s", n, s, 6721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project s->st_info, s->st_shndx, s->st_value, s->st_size, 6731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->strtab + s->st_name); 6741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project s++; 6751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 6761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 6781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 679124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library_on_path(const char* name, const char* const paths[]) { 680124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes char buf[512]; 681124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes for (size_t i = 0; paths[i] != NULL; ++i) { 6821e980b6bc8315d00a07312b25486531247abd98cElliott Hughes int n = __libc_format_buffer(buf, sizeof(buf), "%s/%s", paths[i], name); 683124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (n < 0 || n >= static_cast<int>(sizeof(buf))) { 684ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); 685124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes continue; 6861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 687124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); 688124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd != -1) { 689124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 690124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 691124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 692124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return -1; 6931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 695124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library(const char* name) { 696ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ opening %s ]", name); 6971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 698124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // If the name contains a slash, we should attempt to open it directly and not search the paths. 699124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (strchr(name, '/') != NULL) { 7006971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); 7016971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes if (fd != -1) { 7026971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes return fd; 7036971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes } 7046971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. 705124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 7061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 707124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. 708124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = open_library_on_path(name, gLdPaths); 709124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd == -1) { 710a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes fd = open_library_on_path(name, gDefaultLdPaths); 711124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 712124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 7131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 715124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic soinfo* load_library(const char* name) { 7164688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Open the file. 717650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes int fd = open_library(name); 718650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (fd == -1) { 7194688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("library \"%s\" not found", name); 7201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 7212e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin } 7221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 723650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes // Read the ELF header and load the segments. 724650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ElfReader elf_reader(name, fd); 725650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (!elf_reader.Load()) { 7264688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 72723363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 72823363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner 729650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes const char* bname = strrchr(name, '/'); 730650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes soinfo* si = soinfo_alloc(bname ? bname + 1 : name); 731650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (si == NULL) { 7324688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 73323363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 734650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->base = elf_reader.load_start(); 735650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->size = elf_reader.load_size(); 736650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->load_bias = elf_reader.load_bias(); 737650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->flags = 0; 738650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->entry = 0; 739650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->dynamic = NULL; 740650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phnum = elf_reader.phdr_count(); 741650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phdr = elf_reader.loaded_phdr(); 742650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return si; 7431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 74512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvelstatic soinfo *find_loaded_library(const char *name) 7461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 7471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *si; 7486774809b6249d9d4efd982b6e3ca377c84482d9aDavid 'Digit' Turner const char *bname; 7496774809b6249d9d4efd982b6e3ca377c84482d9aDavid 'Digit' Turner 75012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel // TODO: don't use basename only for determining libraries 75112c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel // http://code.google.com/p/android/issues/detail?id=6670 75212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 75312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel bname = strrchr(name, '/'); 75412c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel bname = bname ? bname + 1 : name; 75512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 756d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (si = solist; si != NULL; si = si->next) { 757d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (!strcmp(bname, si->name)) { 75812c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel return si; 75912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 76012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 76112c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel return NULL; 76212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel} 76312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 764d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesstatic soinfo* find_library_internal(const char* name) { 765d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (name == NULL) { 766d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return somain; 767d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 768d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 769d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo* si = find_loaded_library(name); 770d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 771d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_LINKED) { 772d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 773d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 774d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes DL_ERR("OOPS: recursive link to \"%s\"", si->name); 775d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return NULL; 776d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 77712c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 778ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ '%s' has not been loaded yet. Locating...]", name); 779d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si = load_library(name); 780cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (si == NULL) { 781cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return NULL; 782cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 783cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 784cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // At this point we know that whatever is loaded @ base is a valid ELF 785cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // shared library whose segments are properly mapped in. 786c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE("[ init_library base=%p sz=0x%08x name='%s' ]", 787c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->size, si->name); 788cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 789cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (!soinfo_link_image(si)) { 790cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes munmap(reinterpret_cast<void*>(si->base), si->size); 791cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes soinfo_free(si); 792cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return NULL; 793d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 7946774809b6249d9d4efd982b6e3ca377c84482d9aDavid 'Digit' Turner 795d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 796d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 797d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 798d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesstatic soinfo* find_library(const char* name) { 799d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo* si = find_library_internal(name); 800d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 801ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count++; 802d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 803d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 804d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 805d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 806d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesstatic int soinfo_unload(soinfo* si) { 807ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (si->ref_count == 1) { 808ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("unloading '%s'", si->name); 809d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallDestructors(); 810d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 811c620059479c47a78d57086d73726c9adc2f337adElliott Hughes for (Elf_Dyn* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 812d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 813d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 8148147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("%s needs to unload %s", si->name, library_name); 8158147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes soinfo_unload(find_loaded_library(library_name)); 816d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 8171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 8181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 819d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes munmap(reinterpret_cast<void*>(si->base), si->size); 820d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes notify_gdb_of_unload(si); 821d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo_free(si); 822ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 0; 823d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } else { 824ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count--; 825c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("not unloading '%s', decrementing ref_count to %zd", si->name, si->ref_count); 826d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 827d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return 0; 8281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 830a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesvoid do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 831a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes snprintf(buffer, buffer_size, "%s:%s", gDefaultLdPaths[0], gDefaultLdPaths[1]); 832a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes} 833a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 834cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesvoid do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 835cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (!get_AT_SECURE()) { 836cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_LD_LIBRARY_PATH(ld_library_path); 837cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 838cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 839cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 840e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughessoinfo* do_dlopen(const char* name, int flags) { 841e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL)) != 0) { 842e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes DL_ERR("invalid flags to dlopen: %x", flags); 843e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes return NULL; 844e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes } 845d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ | PROT_WRITE); 846d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo* si = find_library(name); 847d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 848d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 849d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 850d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ); 851d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 852d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 8531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 854d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesint do_dlclose(soinfo* si) { 855d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ | PROT_WRITE); 856d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes int result = soinfo_unload(si); 857d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ); 858d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return result; 8591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 8614eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 862c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughesstatic int soinfo_relocate_a(soinfo* si, Elf_Rela* rela, unsigned count, soinfo* needed[]) { 863c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Elf_Sym* symtab = si->symtab; 864c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes const char* strtab = si->strtab; 865c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Elf_Sym* s; 866c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Elf_Rela* start = rela; 867c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes soinfo* lsi; 868c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 869c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rela) { 870c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes unsigned type = ELF_R_TYPE(rela->r_info); 871c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes unsigned sym = ELF_R_SYM(rela->r_info); 872c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Elf_Addr reloc = static_cast<Elf_Addr>(rela->r_offset + si->load_bias); 873c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Elf_Addr sym_addr = 0; 874c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes char* sym_name = NULL; 875c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 876c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 877c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (type == 0) { // R_*_NONE 878c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes continue; 879c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 880c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym != 0) { 881c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_name = (char *)(strtab + symtab[sym].st_name); 882c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = soinfo_do_lookup(si, sym_name, &lsi, needed); 883c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (s == NULL) { 884c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We only allow an undefined symbol if this is a weak reference... 885c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = &symtab[sym]; 886c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 887c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 888c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 889c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 890c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 891c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes /* IHI0044C AAELF 4.5.1.1: 892c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 893c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Libraries are not searched to resolve weak references. 894c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes It is not an error for a weak reference to remain unsatisfied. 895c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 896c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes During linking, the value of an undefined weak reference is: 897c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - Zero if the relocation type is absolute 898c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of the place if the relocation is pc-relative 899c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of nominal base address if the relocation 900c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes type is base-relative. 901c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes */ 902c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 903c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 904e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 905e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 906e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 907e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 908e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 909e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 910e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 911e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 912e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * The sym_addr was initialized to be zero above, or the relocation 913e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * code below does not care about value of sym_addr. 914e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * No need to do anything. 915e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 916e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 917e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 918c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 919c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 920c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 921c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 922c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // No need to do anything. 923c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 924c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 925c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_addr = reloc; 926c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 9274eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 928c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 929c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%d)", type, rela, (int) (rela - start)); 930c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 931c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 932c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 933c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We got a definition. 934c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_addr = static_cast<Elf_Addr>(s->st_value + lsi->load_bias); 935c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 936c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocSymbol); 937c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 938c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = NULL; 939c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 940c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 941c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 942e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 943e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 944e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 945e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 946e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO JMP_SLOT %16lx <- %16lx %s\n", 947e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 948e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 949e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland sym_name); 950e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) = (sym_addr + rela->r_addend); 951e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 952e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 953e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 954e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 955e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO GLOB_DAT %16lx <- %16lx %s\n", 956e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 957e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 958e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland sym_name); 959e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) = (sym_addr + rela->r_addend); 960e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 961e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 962e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 963e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 964e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO ABS64 %16lx <- %16lx %s\n", 965e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 966e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 967e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland sym_name); 968e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) += (sym_addr + rela->r_addend); 969e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 970e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 971e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 972e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 973e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO ABS32 %16lx <- %16lx %s\n", 974e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 975e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 976e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland sym_name); 977e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((static_cast<Elf_Addr>(INT32_MIN) <= 978e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + (sym_addr + rela->r_addend))) && 979e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland ((*reinterpret_cast<Elf_Addr*>(reloc) + (sym_addr + rela->r_addend)) <= 980e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(UINT32_MAX))) { 981e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) += (sym_addr + rela->r_addend); 982e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 983e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("0x%016lx out of range 0x%016lx to 0x%016lx", 984e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + (sym_addr + rela->r_addend)), 985e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(INT32_MIN), 986e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(UINT32_MAX)); 987e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 988e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 989e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 990e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 991e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 992e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 993e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO ABS16 %16lx <- %16lx %s\n", 994e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 995e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 996e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland sym_name); 997e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((static_cast<Elf_Addr>(INT16_MIN) <= 998e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + (sym_addr + rela->r_addend))) && 999e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland ((*reinterpret_cast<Elf_Addr*>(reloc) + (sym_addr + rela->r_addend)) <= 1000e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(UINT16_MAX))) { 1001e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) += (sym_addr + rela->r_addend); 1002e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 1003e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("0x%016lx out of range 0x%016lx to 0x%016lx", 1004e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + (sym_addr + rela->r_addend)), 1005e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(INT16_MIN), 1006e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_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); 1013e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO REL64 %16lx <- %16lx - %16lx %s\n", 1014e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 1015e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 1016e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland rela->r_offset, 1017e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland sym_name); 1018e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) += (sym_addr + rela->r_addend) - rela->r_offset; 1019e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1020e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL32: 1021e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1022e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1023e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO REL32 %16lx <- %16lx - %16lx %s\n", 1024e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 1025e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 1026e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland rela->r_offset, sym_name); 1027e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((static_cast<Elf_Addr>(INT32_MIN) <= 1028e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 1029e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland ((*reinterpret_cast<Elf_Addr*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= 1030e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(UINT32_MAX))) { 1031e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1032e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 1033e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("0x%016lx out of range 0x%016lx to 0x%016lx", 1034e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 1035e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(INT32_MIN), 1036e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(UINT32_MAX)); 1037e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1038e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1039e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1040e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL16: 1041e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1042e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1043e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO REL16 %16lx <- %16lx - %16lx %s\n", 1044e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 1045e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 1046e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland rela->r_offset, sym_name); 1047e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((static_cast<Elf_Addr>(INT16_MIN) <= 1048e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 1049e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland ((*reinterpret_cast<Elf_Addr*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= 1050e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(UINT16_MAX))) { 1051e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1052e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 1053e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("0x%016lx out of range 0x%016lx to 0x%016lx", 1054e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (*reinterpret_cast<Elf_Addr*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 1055e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(INT16_MIN), 1056e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland static_cast<Elf_Addr>(UINT16_MAX)); 1057e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1058e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1059e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1060e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1061e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 1062e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1063e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1064e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (sym) { 1065e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("odd RELATIVE form..."); 1066e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1067e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1068e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO RELATIVE %16lx <- %16lx\n", 1069e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 1070e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (si->base + rela->r_addend)); 1071e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland *reinterpret_cast<Elf_Addr*>(reloc) = (si->base + rela->r_addend); 1072e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1073e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1074e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_COPY: 1075e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((si->flags & FLAG_EXE) == 0) { 1076e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 1077e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 1078e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * 1079e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * Section 4.7.1.10 "Dynamic relocations" 1080e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * R_AARCH64_COPY may only appear in executable objects where e_type is 1081e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * set to ET_EXEC. 1082e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * 1083e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * FLAG_EXE is set for both ET_DYN and ET_EXEC executables. 1084e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * We should explicitly disallow ET_DYN executables from having 1085e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * R_AARCH64_COPY relocations. 1086e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 1087e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s R_AARCH64_COPY relocations only supported for ET_EXEC", si->name); 1088e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1089e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1090e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocCopy); 1091e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1092e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO COPY %16lx <- %ld @ %16lx %s\n", 1093e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 1094e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland s->st_size, 1095e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 1096e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland sym_name); 1097e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (reloc == (sym_addr + rela->r_addend)) { 1098e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland Elf_Sym *src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); 1099e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1100e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (src == NULL) { 1101e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s R_AARCH64_COPY relocation source cannot be resolved", si->name); 1102e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1103e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1104e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (lsi->has_DT_SYMBOLIC) { 1105e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s invalid R_AARCH64_COPY relocation against DT_SYMBOLIC shared " 1106e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland "library %s (built with -Bsymbolic?)", si->name, lsi->name); 1107e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1108e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1109e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (s->st_size < src->st_size) { 1110e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s R_AARCH64_COPY relocation size mismatch (%ld < %ld)", 1111e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland si->name, s->st_size, src->st_size); 1112e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1113e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1114e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland memcpy((void*)reloc, (void*)(src->st_value + lsi->load_bias), src->st_size); 1115e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 1116e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s R_AARCH64_COPY relocation target cannot be resolved", si->name); 1117e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1118e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1119e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1120e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_TPREL64: 1121e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16lx <- %16lx - %16lx\n", 1122e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 1123e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 1124e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland rela->r_offset); 1125e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1126e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_DTPREL32: 1127e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16lx <- %16lx - %16lx\n", 1128e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland reloc, 1129e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland (sym_addr + rela->r_addend), 1130e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland rela->r_offset); 1131e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1132e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 1133c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 1134c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1135c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1136c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1137c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 1138c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr + rela->r_addend; 1139c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1140c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 1141c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1142c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1143c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1144c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 1145c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr + rela->r_addend; 1146c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1147c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 1148c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1149c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1150c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym) { 1151c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("odd RELATIVE form..."); 1152c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1153c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1154c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), 1155c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(si->base)); 1156c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = si->base + rela->r_addend; 1157c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1158c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 1159c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1160c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1161c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1162c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), sym_name); 1163c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr + rela->r_addend; 1164c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1165c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin case R_X86_64_64: 1166c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin count_relocation(kRelocRelative); 1167c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin MARK(rela->r_offset); 1168c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1169c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin static_cast<size_t>(sym_addr), sym_name); 1170c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr + rela->r_addend; 1171c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin break; 1172c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 1173c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1174c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1175c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", 1176c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), 1177c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), static_cast<size_t>(reloc), sym_name); 1178c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr + rela->r_addend - reloc; 1179c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 11804eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1181e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1182c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 1183c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%d)", type, rela, (int) (rela - start)); 1184c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1185c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1186c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1187c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return 0; 1188c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes} 1189c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1190c620059479c47a78d57086d73726c9adc2f337adElliott Hughesstatic int soinfo_relocate(soinfo* si, Elf_Rel* rel, unsigned count, 1191d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* needed[]) 11921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 1193c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* symtab = si->symtab; 1194d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* strtab = si->strtab; 1195c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* s; 1196c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Rel* start = rel; 1197d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 11981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 11994688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rel) { 1200c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes unsigned type = ELF_R_TYPE(rel->r_info); 1201c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // TODO: don't use unsigned for 'sym'. Use uint32_t or Elf_Addr instead. 1202c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes unsigned sym = ELF_R_SYM(rel->r_info); 1203c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr reloc = static_cast<Elf_Addr>(rel->r_offset + si->load_bias); 1204c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr sym_addr = 0; 1205d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom char* sym_name = NULL; 12061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1207c620059479c47a78d57086d73726c9adc2f337adElliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 1208d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (type == 0) { // R_*_NONE 1209d7daacb46372132ae3f0121647074936c304b572Raghu Gandham continue; 1210d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1211d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (sym != 0) { 1212d1b40d8c69dfca94185ea9231f6cb16f70c02e39Dima Zavin sym_name = (char *)(strtab + symtab[sym].st_name); 12135ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1214d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s == NULL) { 12154eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We only allow an undefined symbol if this is a weak reference... 1216e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan s = &symtab[sym]; 1217c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 1218e9b6fc6f82276188404a2839e31a2f4c19f6c336Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 1219e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1220e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1221e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1222e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan /* IHI0044C AAELF 4.5.1.1: 1223e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1224e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan Libraries are not searched to resolve weak references. 1225e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan It is not an error for a weak reference to remain 1226e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan unsatisfied. 1227e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1228e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan During linking, the value of an undefined weak reference is: 1229e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - Zero if the relocation type is absolute 1230e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - The address of the place if the relocation is pc-relative 1231bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes - The address of nominal base address if the relocation 1232e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan type is base-relative. 1233e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan */ 1234e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1235e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan switch (type) { 12364eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1237e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_JUMP_SLOT: 1238e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_GLOB_DAT: 1239e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_ABS32: 1240e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_RELATIVE: /* Don't care. */ 12414eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 12424eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 12434eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 12444eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 1246d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case R_386_JMP_SLOT: 1247e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_GLOB_DAT: 1248e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_32: 1249c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_386_RELATIVE: /* Don't care. */ 12504eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 12514eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 12524eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 1253e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 1254e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_PC32: 1255e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan sym_addr = reloc; 1256e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 12574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1258e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 12594eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1260e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_COPY: 12614eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // Fall through. Can't really copy if weak symbol is not found at run-time. 12624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1263e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan default: 12644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%d)", type, rel, (int) (rel - start)); 1265e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1266e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1267e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } else { 12684eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We got a definition. 1269c620059479c47a78d57086d73726c9adc2f337adElliott Hughes sym_addr = static_cast<Elf_Addr>(s->st_value + lsi->load_bias); 1270d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1271bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocSymbol); 12721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1273e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan s = NULL; 12741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 12751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1276c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 12774eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 12781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_JUMP_SLOT: 1279bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1281ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 1282c620059479c47a78d57086d73726c9adc2f337adElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr; 12831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_GLOB_DAT: 1285bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1287ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 1288c620059479c47a78d57086d73726c9adc2f337adElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr; 12891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_ABS32: 1291bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1293ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO ABS %08x <- %08x %s", reloc, sym_addr, sym_name); 1294c620059479c47a78d57086d73726c9adc2f337adElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) += sym_addr; 12951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 129634ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner case R_ARM_REL32: 1297bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocRelative); 129834ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner MARK(rel->r_offset); 1299ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", 130034ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner reloc, sym_addr, rel->r_offset, sym_name); 1301c620059479c47a78d57086d73726c9adc2f337adElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) += sym_addr - rel->r_offset; 130234ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner break; 13031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_COPY: 1304d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich if ((si->flags & FLAG_EXE) == 0) { 1305d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* 1306d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 1307d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * 1308d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 1309d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * R_ARM_COPY may only appear in executable objects where e_type is 1310d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * set to ET_EXEC. 1311d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * 1312d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * TODO: FLAG_EXE is set for both ET_DYN and ET_EXEC executables. 1313d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * We should explicitly disallow ET_DYN executables from having 1314d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * R_ARM_COPY relocations. 1315d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich */ 1316d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich DL_ERR("%s R_ARM_COPY relocations only supported for ET_EXEC", si->name); 1317d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich return -1; 1318d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 1319bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocCopy); 13201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1321ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO %08x <- %d @ %08x %s", reloc, s->st_size, sym_addr, sym_name); 1322d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich if (reloc == sym_addr) { 1323c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym *src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); 13245ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 13255ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (src == NULL) { 13265ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s R_ARM_COPY relocation source cannot be resolved", si->name); 13275ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel return -1; 13285ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 13295ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (lsi->has_DT_SYMBOLIC) { 13305ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s invalid R_ARM_COPY relocation against DT_SYMBOLIC shared " 13315ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel "library %s (built with -Bsymbolic?)", si->name, lsi->name); 13325ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel return -1; 13335ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 13345ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s->st_size < src->st_size) { 13355ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s R_ARM_COPY relocation size mismatch (%d < %d)", 13365ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->name, s->st_size, src->st_size); 13375ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel return -1; 13385ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 13395ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel memcpy((void*)reloc, (void*)(src->st_value + lsi->load_bias), src->st_size); 13405ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } else { 13415ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s R_ARM_COPY relocation target cannot be resolved", si->name); 1342d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich return -1; 1343d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 13441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 13454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 13464eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_JMP_SLOT: 13474eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13484eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13494eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 13504eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr; 13514eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13524eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_GLOB_DAT: 13534eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13544eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13554eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 13564eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) = sym_addr; 13574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13584eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_32: 13594eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13604eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13614eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_32 %08x <- +%08x %s", reloc, sym_addr, sym_name); 13624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) += sym_addr; 13634eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_PC32: 13654eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13674eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", 13684eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); 13694eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) += (sym_addr - reloc); 13704eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13714eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__mips__) 13724eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_MIPS_REL32: 13734eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 13744eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x %s", 13764eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reloc, sym_addr, (sym_name) ? sym_name : "*SECTIONHDR*"); 13774eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (s) { 13784eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) += sym_addr; 13794eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } else { 13804eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) += si->base; 13814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13824eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13834eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13844eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes 13854eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 13864eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_ARM_RELATIVE: 13874eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 13884eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_RELATIVE: 13894eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13904eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13914eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (sym) { 13934eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("odd RELATIVE form..."); 13944eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes return -1; 13954eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13964eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", 13974eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); 13984eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes *reinterpret_cast<Elf_Addr*>(reloc) += si->base; 13994eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 14001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project default: 14024eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("unknown reloc type %d @ %p (%d)", type, rel, (int) (rel - start)); 14031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 14041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 14051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 14061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 14071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1408c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 14091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14104eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 141187c358524e479235aa6241736d2ce325f89daafcBrian Carlstromstatic bool mips_relocate_got(soinfo* si, soinfo* needed[]) { 141287c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned* got = si->plt_got; 141387c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (got == NULL) { 141487c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 141587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom } 141687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned local_gotno = si->mips_local_gotno; 141787c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned gotsym = si->mips_gotsym; 141887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned symtabno = si->mips_symtabno; 1419c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* symtab = si->symtab; 1420d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1421d7daacb46372132ae3f0121647074936c304b572Raghu Gandham /* 1422d7daacb46372132ae3f0121647074936c304b572Raghu Gandham * got[0] is address of lazy resolver function 1423d7daacb46372132ae3f0121647074936c304b572Raghu Gandham * got[1] may be used for a GNU extension 1424bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes * set it to a recognizable address in case someone calls it 1425d7daacb46372132ae3f0121647074936c304b572Raghu Gandham * (should be _rtld_bind_start) 1426d7daacb46372132ae3f0121647074936c304b572Raghu Gandham * FIXME: maybe this should be in a separate routine 1427d7daacb46372132ae3f0121647074936c304b572Raghu Gandham */ 1428d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1429d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if ((si->flags & FLAG_LINKER) == 0) { 143087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom size_t g = 0; 1431d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got[g++] = 0xdeadbeef; 1432d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (got[g] & 0x80000000) { 1433d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got[g++] = 0xdeadfeed; 1434d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1435d7daacb46372132ae3f0121647074936c304b572Raghu Gandham /* 1436d7daacb46372132ae3f0121647074936c304b572Raghu Gandham * Relocate the local GOT entries need to be relocated 1437d7daacb46372132ae3f0121647074936c304b572Raghu Gandham */ 1438d7daacb46372132ae3f0121647074936c304b572Raghu Gandham for (; g < local_gotno; g++) { 1439d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got[g] += si->load_bias; 1440d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1441d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1442d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1443d7daacb46372132ae3f0121647074936c304b572Raghu Gandham /* Now for the global GOT entries */ 1444c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* sym = symtab + gotsym; 1445d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got = si->plt_got + local_gotno; 144687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { 1447d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* sym_name; 1448c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Sym* s; 1449d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 1450d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1451d7daacb46372132ae3f0121647074936c304b572Raghu Gandham /* This is an undefined reference... try to locate it */ 1452d7daacb46372132ae3f0121647074936c304b572Raghu Gandham sym_name = si->strtab + sym->st_name; 14535ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1454d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (s == NULL) { 1455d7daacb46372132ae3f0121647074936c304b572Raghu Gandham /* We only allow an undefined symbol if this is a weak 1456d7daacb46372132ae3f0121647074936c304b572Raghu Gandham reference.. */ 1457d7daacb46372132ae3f0121647074936c304b572Raghu Gandham s = &symtab[g]; 1458c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 14594688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot locate \"%s\"...", sym_name); 146087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return false; 1461d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1462d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *got = 0; 1463d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1464d7daacb46372132ae3f0121647074936c304b572Raghu Gandham else { 1465d7daacb46372132ae3f0121647074936c304b572Raghu Gandham /* FIXME: is this sufficient? 1466d7daacb46372132ae3f0121647074936c304b572Raghu Gandham * For reference see NetBSD link loader 1467d7daacb46372132ae3f0121647074936c304b572Raghu Gandham * 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 1468d7daacb46372132ae3f0121647074936c304b572Raghu Gandham */ 14695ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel *got = lsi->load_bias + s->st_value; 1470d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1471d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 147287c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 1473d7daacb46372132ae3f0121647074936c304b572Raghu Gandham} 1474d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1475d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1476ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughesvoid soinfo::CallArray(const char* array_name UNUSED, linker_function_t* functions, size_t count, bool reverse) { 1477ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (functions == NULL) { 1478d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1479d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14808215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1481c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("[ Calling %s (size %zd) @ %p for '%s' ]", array_name, count, functions, name); 14828215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1483ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int begin = reverse ? (count - 1) : 0; 1484ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int end = reverse ? -1 : count; 1485ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int step = reverse ? -1 : 1; 14868215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1487ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (int i = begin; i != end; i += step) { 1488ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); 1489ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes CallFunction("function", functions[i]); 1490d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1491d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1492ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s for '%s' ]", array_name, name); 14931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 14941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1495ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughesvoid soinfo::CallFunction(const char* function_name UNUSED, linker_function_t function) { 1496db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) { 1497d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1498d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1499d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1500ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); 1501d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes function(); 1502ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); 1503db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes 1504db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures 1505db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // are still writable. This happens with our debug malloc (see http://b/7941716). 1506db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes set_soinfo_pool_protection(PROT_READ | PROT_WRITE); 15079181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov} 15089181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 1509d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallPreInitConstructors() { 15108147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_PREINIT_ARRAY functions are called before any other constructors for executables, 15118147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // but ignored in a shared library. 1512d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); 1513d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 1514e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1515d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallConstructors() { 1516d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (constructors_called) { 1517d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1518d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1519e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1520d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // We set constructors_called before actually calling the constructors, otherwise it doesn't 1521d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // protect against recursive constructor calls. One simple example of constructor recursion 1522d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: 1523d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 1. The program depends on libc, so libc's constructor is called here. 1524d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. 1525d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 3. dlopen() calls the constructors on the newly created 1526d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // soinfo for libc_malloc_debug_leak.so. 1527d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 4. The debug .so depends on libc, so CallConstructors is 1528d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // called again with the libc soinfo. If it doesn't trigger the early- 1529d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // out above, the libc constructor will be called again (recursively!). 1530d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes constructors_called = true; 1531d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 15328147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { 15338147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // The GNU dynamic linker silently ignores these, but we warn the developer. 1534c620059479c47a78d57086d73726c9adc2f337adElliott Hughes PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", 15358147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes name, preinit_array_count); 1536d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 15371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1538d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (dynamic != NULL) { 1539c620059479c47a78d57086d73726c9adc2f337adElliott Hughes for (Elf_Dyn* d = dynamic; d->d_tag != DT_NULL; ++d) { 1540d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1541d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = strtab + d->d_un.d_val; 15428147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors in DT_NEEDED \"%s\"", name, library_name); 15438147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes find_loaded_library(library_name)->CallConstructors(); 1544d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 15451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1546d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 15471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15488147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors", name); 15498147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15508147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_INIT should be called before DT_INIT_ARRAY if both are present. 1551d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_INIT", init_func); 1552d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); 1553e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov} 15548215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1555d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallDestructors() { 15568147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling destructors", name); 15578147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15588147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI_ARRAY must be parsed in reverse order. 1559d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); 15608147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 15618147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI should be called after DT_FINI_ARRAY if both are present. 1562d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_FINI", fini_func); 15631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 15641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Force any of the closed stdin, stdout and stderr to be associated with 15661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /dev/null. */ 15675419b9474753d25dff947c7740532f86d130c0beElliott Hughesstatic int nullify_closed_stdio() { 15681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int dev_null, i, status; 15691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int return_value = 0; 15701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 157116084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR)); 15721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null < 0) { 15734688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot open /dev/null: %s", strerror(errno)); 15741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 15751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1576ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); 15771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If any of the stdio file descriptors is valid and not associated 15791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project with /dev/null, dup /dev/null to it. */ 15801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for (i = 0; i < 3; i++) { 15811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If it is /dev/null already, we are done. */ 15824688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (i == dev_null) { 15831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 15844688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 15851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1586ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Nullifying stdio file descriptor %d]", i); 15874688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); 15881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15894688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes /* If file is opened, we are good. */ 15904688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status != -1) { 15914688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes continue; 15924688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 15931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* The only error we allow is that the file descriptor does not 15951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project exist, in which case we dup /dev/null to it. */ 15961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (errno != EBADF) { 15974688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("fcntl 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 /* Try dupping /dev/null to this stdio file descriptor and 16031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project repeat if there is a signal. Note that any errors in closing 16041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project the stdio descriptor are lost. */ 16054688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); 16061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (status < 0) { 16074688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("dup2 failed: %s", strerror(errno)); 16081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 16101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If /dev/null is not one of the stdio file descriptors, close it. */ 16141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null > 2) { 1615ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); 16164688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(close(dev_null)); 16174688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status == -1) { 16184688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("close failed: %s", strerror(errno)); 16191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 16201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 16231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return return_value; 16241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 16251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1626124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic bool soinfo_link_image(soinfo* si) { 1627f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee /* "base" might wrap around UINT32_MAX. */ 1628c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr base = si->load_bias; 1629c620059479c47a78d57086d73726c9adc2f337adElliott Hughes const Elf_Phdr *phdr = si->phdr; 16301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int phnum = si->phnum; 1631d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom bool relocating_linker = (si->flags & FLAG_LINKER) != 0; 16321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1633b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can't debug anything until the linker is relocated */ 1634b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1635ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ linking %s ]", si->name); 1636c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p si->flags = 0x%08x", reinterpret_cast<void*>(si->base), si->flags); 1637b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 16381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 163963f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner /* Extract dynamic section */ 1640124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes size_t dynamic_count; 1641c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Word dynamic_flags; 164212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, 1643cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman &dynamic_count, &dynamic_flags); 164463f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner if (si->dynamic == NULL) { 1645b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1646124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); 1647b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 1648124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 164963f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } else { 1650b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1651ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("dynamic = %p", si->dynamic); 1652b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 165363f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } 165463f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 16554eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 165663f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner (void) phdr_table_get_arm_exidx(phdr, phnum, base, 165763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner &si->ARM_exidx, &si->ARM_exidx_count); 165863f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner#endif 165963f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 16608147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // Extract useful information from dynamic section. 1661d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom uint32_t needed_count = 0; 1662c620059479c47a78d57086d73726c9adc2f337adElliott Hughes for (Elf_Dyn* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1663c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", 1664c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1665c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (d->d_tag) { 16661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_HASH: 1667d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->nbucket = ((unsigned *) (base + d->d_un.d_ptr))[0]; 1668d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->nchain = ((unsigned *) (base + d->d_un.d_ptr))[1]; 1669d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->bucket = (unsigned *) (base + d->d_un.d_ptr + 8); 1670d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->chain = (unsigned *) (base + d->d_un.d_ptr + 8 + si->nbucket * 4); 16711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_STRTAB: 1673d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->strtab = (const char *) (base + d->d_un.d_ptr); 16741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_SYMTAB: 1676c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->symtab = (Elf_Sym *) (base + d->d_un.d_ptr); 16771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16784eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if !defined(__LP64__) 16791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTREL: 1680d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val != DT_REL) { 1681124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1682124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 16831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 16841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1685c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_JMPREL: 16874eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1688c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->plt_rela = (Elf_Rela*) (base + d->d_un.d_ptr); 1689c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1690c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->plt_rel = (Elf_Rel*) (base + d->d_un.d_ptr); 1691c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTRELSZ: 16944eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1695c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->plt_rela_count = d->d_un.d_val / sizeof(Elf_Rela); 1696c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1697c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->plt_rel_count = d->d_un.d_val / sizeof(Elf_Rel); 1698c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17004eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if !defined(__LP64__) 17011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTGOT: 17024eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // Used by 32-bit MIPS. 1703d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->plt_got = (unsigned *)(base + d->d_un.d_ptr); 17041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1705c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_DEBUG: 1707bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_DEBUG entry to the address of _r_debug for GDB 1708cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman // if the dynamic table is writable 170999c32055cb50443f722c55914869c1f6bb941959Elliott Hughes if ((dynamic_flags & PF_W) != 0) { 1710c620059479c47a78d57086d73726c9adc2f337adElliott Hughes d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); 171199c32055cb50443f722c55914869c1f6bb941959Elliott Hughes } 17121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17134eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1714c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELA: 1715c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->rela = (Elf_Rela*) (base + d->d_un.d_ptr); 1716c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1717c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELASZ: 1718c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->rela_count = d->d_un.d_val / sizeof(Elf_Rela); 1719c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1720c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1721c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_REL in \"%s\"", si->name); 1722c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1723c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 1724c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); 1725c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1726c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1727c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1728c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->rel = (Elf_Rel*) (base + d->d_un.d_ptr); 1729c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1730c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 1731c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->rel_count = d->d_un.d_val / sizeof(Elf_Rel); 1732c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1733ad13c57298e57d33c130fb03a2c6494da573408cShin-ichiro KAWASAKI case DT_RELA: 1734124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1735124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1736c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 17371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT: 1738ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17398147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT) found at %p", si->name, si->init_func); 17401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI: 1742ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 17438147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI) found at %p", si->name, si->fini_func); 17441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAY: 1746ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17478147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT_ARRAY) found at %p", si->name, si->init_array); 17481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAYSZ: 1750c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->init_array_count = ((unsigned)d->d_un.d_val) / sizeof(Elf_Addr); 17511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAY: 1753ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17548147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI_ARRAY) found at %p", si->name, si->fini_array); 17551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAYSZ: 1757c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->fini_array_count = ((unsigned)d->d_un.d_val) / sizeof(Elf_Addr); 17581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAY: 1760ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->preinit_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 17618147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_PREINIT_ARRAY) found at %p", si->name, si->preinit_array); 17621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAYSZ: 1764c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(Elf_Addr); 17651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 17661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_TEXTREL: 1767e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1768e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1769e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1770e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 17715135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->has_text_relocations = true; 17721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1773e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 17745ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_SYMBOLIC: 17755ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 17765ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 1777d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom case DT_NEEDED: 1778d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom ++needed_count; 1779d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom break; 17805ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_FLAGS: 1781d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_TEXTREL) { 1782e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1783e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1784e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1785e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 17865ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_text_relocations = true; 1787e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 17885ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 1789d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_SYMBOLIC) { 17905ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 17915ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 17925ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 17934eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 1794d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_STRSZ: 1795d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_SYMENT: 1796d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_RELENT: 1797d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1798d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_MAP: 1799bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB. 1800d7daacb46372132ae3f0121647074936c304b572Raghu Gandham { 1801d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom r_debug** dp = (r_debug**) d->d_un.d_ptr; 1802d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *dp = &_r_debug; 1803d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1804d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1805d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_VERSION: 1806d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_FLAGS: 1807d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_BASE_ADDRESS: 1808d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_UNREFEXTNO: 1809d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1810d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1811d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_SYMTABNO: 1812d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_symtabno = d->d_un.d_val; 1813d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1814d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1815d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_LOCAL_GOTNO: 1816d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_local_gotno = d->d_un.d_val; 1817d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1818d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1819d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_GOTSYM: 1820d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_gotsym = d->d_un.d_val; 1821d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18224eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1823d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1824d7daacb46372132ae3f0121647074936c304b572Raghu Gandham default: 18254eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DEBUG("Unused DT entry: type %p arg %p", 18264eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1827d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 18281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1831c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", 1832c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->strtab, si->symtab); 18331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1834124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Sanity checks. 1835d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (relocating_linker && needed_count != 0) { 1836d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); 1837d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom return false; 1838d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 1839124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->nbucket == 0) { 1840124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); 1841124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1842124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1843124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->strtab == 0) { 1844124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); 1845124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1846124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1847124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->symtab == 0) { 1848124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); 1849124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 18527e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // If this is the main executable, then load all of the libraries from LD_PRELOAD now. 1853d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_EXE) { 1854d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom memset(gLdPreloads, 0, sizeof(gLdPreloads)); 18557e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes size_t preload_count = 0; 1856d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes for (size_t i = 0; gLdPreloadNames[i] != NULL; i++) { 1857d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo* lsi = find_library(gLdPreloadNames[i]); 18587e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes if (lsi != NULL) { 18597e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes gLdPreloads[preload_count++] = lsi; 18607e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes } else { 18617e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // As with glibc, failure to load an LD_PRELOAD library is just a warning. 18627e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", 18637e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes gLdPreloadNames[i], si->name, linker_get_error_buffer()); 18644fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 18654fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 18664fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 18674fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1868d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo** needed = (soinfo**) alloca((1 + needed_count) * sizeof(soinfo*)); 1869d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo** pneeded = needed; 187012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 1871c620059479c47a78d57086d73726c9adc2f337adElliott Hughes for (Elf_Dyn* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1872d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1873d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 1874ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s needs %s", si->name, library_name); 1875d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi = find_library(library_name); 1876d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (lsi == NULL) { 1877650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); 18784688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("could not load library \"%s\" needed by \"%s\"; caused by %s", 1879d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom library_name, si->name, tmp_err_buf); 1880124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 188212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded++ = lsi; 18831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 18841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 188512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded = NULL; 18861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1887e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 18885135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1889e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // Make segments writable to allow text relocations to work properly. We will later call 1890e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // phdr_table_protect_segments() after all of them are applied and all constructors are run. 18913d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich DL_WARN("%s has text relocations. This is wasting memory and prevents " 18923d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich "security hardening. Please fix.", si->name); 18935135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 18945135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't unprotect loadable segments for \"%s\": %s", 18955135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1896124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18975135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 18985135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 1899e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 19005135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich 19014eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1902c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->plt_rela != NULL) { 1903c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("[ relocating %s plt ]\n", si->name ); 1904c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (soinfo_relocate_a(si, si->plt_rela, si->plt_rela_count, needed)) { 1905c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1906c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1907c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1908c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->rela != NULL) { 1909c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("[ relocating %s ]\n", si->name ); 1910c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (soinfo_relocate_a(si, si->rela, si->rela_count, needed)) { 1911c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1912c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1913c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1914c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1915d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->plt_rel != NULL) { 1916ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ relocating %s plt ]", si->name ); 1917d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { 1918124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1919124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1921d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->rel != NULL) { 1922ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ relocating %s ]", si->name ); 1923d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { 1924124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1925124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 19261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1927c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 19281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19294eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 193087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (!mips_relocate_got(si, needed)) { 1931124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1932d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1933d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1934d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 19351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_LINKED; 1936ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ finished linking %s ]", si->name); 19371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1938e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 19395135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1940e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // All relocations are done, we can protect our segments back to read-only. 19415135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 19425135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't protect segments for \"%s\": %s", 19435135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1944124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19455135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 19461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1947e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 19481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1949b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can also turn on GNU RELRO protection */ 1950b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) { 19514688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", 19524688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes si->name, strerror(errno)); 1953124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 19549ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich } 19559ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich 19561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project notify_gdb_of_load(si); 1957124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return true; 19581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 19591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1960468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 1961c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * This function add vdso to internal dso list. 1962c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * It helps to stack unwinding through signal handlers. 1963c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * Also, it makes bionic more like glibc. 1964c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov */ 1965c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikovstatic void add_vdso(KernelArgumentBlock& args UNUSED) { 19664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(AT_SYSINFO_EHDR) 1967c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Ehdr* ehdr_vdso = reinterpret_cast<Elf_Ehdr*>(args.getauxval(AT_SYSINFO_EHDR)); 19685407eed84b98056a5af7d95007d8d511ebad60e4Pavel Chupin if (ehdr_vdso == NULL) { 19695407eed84b98056a5af7d95007d8d511ebad60e4Pavel Chupin return; 19705407eed84b98056a5af7d95007d8d511ebad60e4Pavel Chupin } 1971c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 1972c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov soinfo* si = soinfo_alloc("[vdso]"); 1973ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 1974c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->phdr = reinterpret_cast<Elf_Phdr*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); 1975c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov si->phnum = ehdr_vdso->e_phnum; 1976ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov si->base = reinterpret_cast<Elf_Addr>(ehdr_vdso); 1977ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov si->size = phdr_table_get_load_size(si->phdr, si->phnum); 1978ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov si->flags = 0; 1979ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov si->load_bias = get_elf_exec_load_bias(ehdr_vdso); 1980ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 1981ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov soinfo_link_image(si); 1982c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov#endif 1983c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov} 1984c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 1985c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov/* 1986468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This code is called after the linker has linked itself and 1987468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * fixed it's own GOT. It is safe to make references to externs 1988468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * and other non-local data at this point. 1989468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 1990c620059479c47a78d57086d73726c9adc2f337adElliott Hughesstatic Elf_Addr __linker_init_post_relocation(KernelArgumentBlock& args, Elf_Addr linker_base) { 199142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes /* NOTE: we store the args pointer on a special location 1992ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * of the temporary TLS area in order to pass it to 1993ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * the C Library's runtime initializer. 1994ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * 1995ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * The initializer must clear the slot and reset the TLS 1996ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * to point to a different location to ensure that no other 1997ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * shared library constructor can access it. 1998ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner */ 1999d3920b3a996b358e48232f417aa0a1e44a60f155Elliott Hughes __libc_init_tls(args); 20001a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov 20011a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#if TIMING 20021a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov struct timeval t0, t1; 20031a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov gettimeofday(&t0, 0); 20041a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#endif 20051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 200618a206c81d9743481e364384affd43306911283dElliott Hughes // Initialize environment functions, and get to the ELF aux vectors table. 200742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_env_init(args); 2008be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 20098d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // If this is a setuid/setgid program, close the security hole described in 20108d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc 20118d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich if (get_AT_SECURE()) { 20128d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich nullify_closed_stdio(); 20138d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich } 20148d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich 2015d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom debuggerd_init(); 20161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 201718a206c81d9743481e364384affd43306911283dElliott Hughes // Get a few environment variables. 201861a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes const char* LD_DEBUG = linker_env_get("LD_DEBUG"); 201961a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes if (LD_DEBUG != NULL) { 2020650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes gLdDebugVerbosity = atoi(LD_DEBUG); 202118a206c81d9743481e364384affd43306911283dElliott Hughes } 2022be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 202318a206c81d9743481e364384affd43306911283dElliott Hughes // Normally, these are cleaned by linker_env_init, but the test 202418a206c81d9743481e364384affd43306911283dElliott Hughes // doesn't cost us anything. 202518a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpath_env = NULL; 202618a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpreload_env = NULL; 202718a206c81d9743481e364384affd43306911283dElliott Hughes if (!get_AT_SECURE()) { 202818a206c81d9743481e364384affd43306911283dElliott Hughes ldpath_env = linker_env_get("LD_LIBRARY_PATH"); 202918a206c81d9743481e364384affd43306911283dElliott Hughes ldpreload_env = linker_env_get("LD_PRELOAD"); 20301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2032ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ android linker & debugger ]"); 20331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 203442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo* si = soinfo_alloc(args.argv[0]); 203518a206c81d9743481e364384affd43306911283dElliott Hughes if (si == NULL) { 203618a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 20371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2039d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* bootstrap the link map, the main exe always needs to be first */ 20401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_EXE; 2041ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes link_map_t* map = &(si->link_map); 20421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_addr = 0; 204442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes map->l_name = args.argv[0]; 20451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = NULL; 20461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = NULL; 20471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 20491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 20501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2051d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* gdb expects the linker to be in the debug shared object list. 2052d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Without this, gdb has trouble locating the linker's ".text" 2053d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * and ".plt" sections. Gdb could also potentially use this to 2054d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * relocate the offset of our exported 'rtld_db_dlactivity' symbol. 2055d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Don't use soinfo_alloc(), because the linker shouldn't 2056d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * be on the soinfo list. 205706f0e74a2b957db93fed3fdd49fe939ab2fe1595Ben Cheng */ 2058d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom { 2059d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom static soinfo linker_soinfo; 20604eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 20611a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin strlcpy(linker_soinfo.name, "/system/bin/linker64", sizeof(linker_soinfo.name)); 20621a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin#else 2063d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom strlcpy(linker_soinfo.name, "/system/bin/linker", sizeof(linker_soinfo.name)); 20641a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin#endif 2065d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_soinfo.flags = 0; 2066d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_soinfo.base = linker_base; 2067d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 2068d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* 2069d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Set the dynamic field in the link map otherwise gdb will complain with 2070d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * the following: 2071d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * warning: .dynamic section for "/system/bin/linker" is not at the 2072d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * expected address (wrong library or version mismatch?) 2073d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom */ 2074c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Ehdr *elf_hdr = (Elf_Ehdr *) linker_base; 2075c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Phdr *phdr = (Elf_Phdr*)((unsigned char*) linker_base + elf_hdr->e_phoff); 2076d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, 2077d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom &linker_soinfo.dynamic, NULL, NULL); 2078d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom insert_soinfo_into_debug_map(&linker_soinfo); 2079d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 20801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 208142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Extract information passed from the kernel. 2082c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->phdr = reinterpret_cast<Elf_Phdr*>(args.getauxval(AT_PHDR)); 208342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->phnum = args.getauxval(AT_PHNUM); 208442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->entry = args.getauxval(AT_ENTRY); 20851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20868180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner /* Compute the value of si->base. We can't rely on the fact that 20878180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * the first entry is the PHDR because this will not be true 20888180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * for certain executables (e.g. some in the NDK unit test suite) 20898180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner */ 20908180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner si->base = 0; 2091b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner si->size = phdr_table_get_load_size(si->phdr, si->phnum); 2092bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner si->load_bias = 0; 2093ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (size_t i = 0; i < si->phnum; ++i) { 209442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes if (si->phdr[i].p_type == PT_PHDR) { 2095c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->load_bias = reinterpret_cast<Elf_Addr>(si->phdr) - si->phdr[i].p_vaddr; 2096c620059479c47a78d57086d73726c9adc2f337adElliott Hughes si->base = reinterpret_cast<Elf_Addr>(si->phdr) - si->phdr[i].p_offset; 209742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes break; 209842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 20998180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner } 2100d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->dynamic = NULL; 2101ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 1; 21021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21034688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). 21044688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_LIBRARY_PATH(ldpath_env); 21054688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_PRELOAD(ldpreload_env); 21064fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 21075ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel somain = si; 21085ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 2109124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (!soinfo_link_image(si)) { 2110650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer()); 211118a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 21121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2114c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov add_vdso(args); 2115c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2116d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallPreInitConstructors(); 21179181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 2118d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (size_t i = 0; gLdPreloads[i] != NULL; ++i) { 2119d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom gLdPreloads[i]->CallConstructors(); 2120326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng } 2121326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng 2122d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* After the link_image, the si->load_bias is initialized. 2123d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * For so lib, the map->l_addr will be updated in notify_gdb_of_load. 2124d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * We need to update this value for so exe here. So Unwind_Backtrace 2125d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * for some arch like x86 could work correctly within so exe. 21269c3449ecd9d5e9cdb1e995e35e53334a4a288a5eXiaokang Qin */ 2127c5db969aa4a24a76fc0964f2ff89533e832b47a6Chao-Ying Fu map->l_addr = si->load_bias; 2128d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 2129e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 21301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING 21311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project gettimeofday(&t1,NULL); 2132ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("LINKER TIME: %s: %d microseconds", args.argv[0], (int) ( 21331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - 21341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec) 21351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project )); 21361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 2138ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol", args.argv[0], 2139bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocAbsolute], 2140bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocRelative], 2141bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocCopy], 2142bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocSymbol]); 21431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 21451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project { 21461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 21471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned i; 21481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = 0; 2149d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (n = 0; n < 4096; n++) { 2150d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (bitmask[n]) { 21511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned x = bitmask[n]; 2152e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 2153e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland for (i = 0; i < 32; i++) { 2154e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 2155d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (i = 0; i < 8; i++) { 2156e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 2157d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (x & 1) { 2158d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom count++; 2159d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 21601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project x >>= 1; 21611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2164ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("PAGES MODIFIED: %s: %d (%dKB)", args.argv[0], count, count * 4); 21651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 21661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING || STATS || COUNT_PAGES 21691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fflush(stdout); 21701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2172c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE("[ Ready to execute '%s' @ %p ]", si->name, reinterpret_cast<void*>(si->entry)); 21731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return si->entry; 21741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2175468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 2176bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner/* Compute the load-bias of an existing executable. This shall only 2177bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * be used to compute the load bias of an executable or shared library 2178bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * that was loaded by the kernel itself. 2179bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * 2180bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Input: 2181bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * elf -> address of ELF header, assumed to be at the start of the file. 2182bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Return: 2183bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * load bias, i.e. add the value of any p_vaddr in the file to get 2184bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * the corresponding address in memory. 2185bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner */ 2186c620059479c47a78d57086d73726c9adc2f337adElliott Hughesstatic Elf_Addr get_elf_exec_load_bias(const Elf_Ehdr* elf) { 2187c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr offset = elf->e_phoff; 2188c620059479c47a78d57086d73726c9adc2f337adElliott Hughes const Elf_Phdr* phdr_table = (const Elf_Phdr*)((char*)elf + offset); 2189c620059479c47a78d57086d73726c9adc2f337adElliott Hughes const Elf_Phdr* phdr_end = phdr_table + elf->e_phnum; 2190fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 2191c620059479c47a78d57086d73726c9adc2f337adElliott Hughes for (const Elf_Phdr* phdr = phdr_table; phdr < phdr_end; phdr++) { 2192fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (phdr->p_type == PT_LOAD) { 2193c620059479c47a78d57086d73726c9adc2f337adElliott Hughes return reinterpret_cast<Elf_Addr>(elf) + phdr->p_offset - phdr->p_vaddr; 2194bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner } 2195fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 2196fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return 0; 2197bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner} 2198bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner 2199468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2200468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This is the entry point for the linker, called from begin.S. This 2201468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * method is responsible for fixing the linker's own relocations, and 2202468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * then calling __linker_init_post_relocation(). 2203468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * 2204468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * Because this method is called before the linker has fixed it's own 2205468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * relocations, any attempt to reference an extern variable, extern 2206468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * function, or other GOT reference will generate a segfault. 2207468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 2208c620059479c47a78d57086d73726c9adc2f337adElliott Hughesextern "C" Elf_Addr __linker_init(void* raw_args) { 220942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes KernelArgumentBlock args(raw_args); 221042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2211c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr linker_addr = args.getauxval(AT_BASE); 2212c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Ehdr* elf_hdr = reinterpret_cast<Elf_Ehdr*>(linker_addr); 2213c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Phdr* phdr = (Elf_Phdr*)((unsigned char*) linker_addr + elf_hdr->e_phoff); 221442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 221542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo linker_so; 221642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes memset(&linker_so, 0, sizeof(soinfo)); 221742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2218b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes strcpy(linker_so.name, "[dynamic linker]"); 221942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.base = linker_addr; 222042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); 222142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); 2222d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_so.dynamic = NULL; 222342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phdr = phdr; 222442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phnum = elf_hdr->e_phnum; 222542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.flags |= FLAG_LINKER; 222642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 222742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes if (!soinfo_link_image(&linker_so)) { 222842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // It would be nice to print an error message, but if the linker 222942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // can't link itself, there's no guarantee that we'll be able to 2230b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // call write() (because it involves a GOT reference). We may as 2231b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // well try though... 2232b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes const char* msg = "CANNOT LINK EXECUTABLE: "; 2233b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, msg, strlen(msg)); 2234b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); 2235b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, "\n", 1); 2236b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes _exit(EXIT_FAILURE); 223742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 2238468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 223942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // We have successfully fixed our own relocations. It's safe to run 224042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // the main part of the linker now. 22410d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes args.abort_message_ptr = &gAbortMessage; 2242c620059479c47a78d57086d73726c9adc2f337adElliott Hughes Elf_Addr start_address = __linker_init_post_relocation(args, linker_addr); 22435419b9474753d25dff947c7740532f86d130c0beElliott Hughes 224442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes set_soinfo_pool_protection(PROT_READ); 2245d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 224642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Return the address that the calling assembly stub should jump to. 224742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes return start_address; 2248468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich} 2249