linker.cpp revision b906e13c55c9fe9b4157ba548534a0230434882b
11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 2943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan * Copyright (C) 2008, 2009 The Android Open Source Project 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions of source code must retain the above copyright 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions in binary form must reproduce the above copyright 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * the documentation and/or other materials provided with the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 294688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <dlfcn.h> 304688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <errno.h> 314688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <fcntl.h> 320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes#include <inttypes.h> 334688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <pthread.h> 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdlib.h> 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <string.h> 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/atomics.h> 384688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/mman.h> 394688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <sys/stat.h> 404688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes#include <unistd.h> 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 424688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Private C library headers. 43eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/bionic_tls.h" 44eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/KernelArgumentBlock.h" 45eb847bc8666842a3cfc9c06e8458ad1abebebaf0Elliott Hughes#include "private/ScopedPthreadMutexLocker.h" 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker.h" 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "linker_debug.h" 49be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner#include "linker_environ.h" 5023363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner#include "linker_phdr.h" 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Do NOT use malloc() and friends or pthread_*() code here. 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Don't use printf() either; it's caused mysterious memory 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * corruption in the past. 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The linker runs before we bring up libc and it's easiest 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * to make sure it does not depend on any complex libc features 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * open issues / todo: 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - cleaner error reporting 631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - after linking, set as much stuff as possible to READONLY 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * and NOEXEC 654688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes */ 661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 67183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo); 680266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf); 691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 70ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// We can't use malloc(3) in the dynamic linker. We use a linked list of anonymous 71ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// maps, each a single page in size. The pages are broken up into as many struct soinfo 72ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// objects as will fit, and they're all threaded together on a free list. 73ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn#define SOINFO_PER_POOL ((PAGE_SIZE - sizeof(soinfo_pool_t*)) / sizeof(soinfo)) 74ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstruct soinfo_pool_t { 75ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo_pool_t* next; 76ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo info[SOINFO_PER_POOL]; 77ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn}; 78ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic struct soinfo_pool_t* gSoInfoPools = NULL; 79ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic soinfo* gSoInfoFreeList = NULL; 80ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 81d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* solist = &libdl_info; 82d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* sonext = &libdl_info; 83d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* somain; /* main process, always the one after libdl_info */ 841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 85a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesstatic const char* const gDefaultLdPaths[] = { 864eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 87011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/vendor/lib64", 88011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/system/lib64", 89011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#else 90124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/vendor/lib", 91124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/system/lib", 92011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#endif 93124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes NULL 94124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes}; 95124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes 96a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_BUFSIZE (LDPATH_MAX*64) 97a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_MAX 8 98a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 99a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_BUFSIZE (LDPRELOAD_MAX*64) 100a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_MAX 8 101a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 102124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic char gLdPathsBuffer[LDPATH_BUFSIZE]; 103124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic const char* gLdPaths[LDPATH_MAX + 1]; 104bc3a5c26f1b9cf29da6abfc3e197258ef4c03362David Bartley 105124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic char gLdPreloadsBuffer[LDPRELOAD_BUFSIZE]; 106124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic const char* gLdPreloadNames[LDPRELOAD_MAX + 1]; 1074fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 108d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* gLdPreloads[LDPRELOAD_MAX + 1]; 1094fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 110650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes__LIBC_HIDDEN__ int gLdDebugVerbosity; 1111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1120d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes__LIBC_HIDDEN__ abort_msg_t* gAbortMessage = NULL; // For debuggerd. 1130d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes 114bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesenum RelocationKind { 115bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocAbsolute = 0, 116bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocRelative, 117bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocCopy, 118bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocSymbol, 119bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocMax 120bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 121be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 1221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 123bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstruct linker_stats_t { 124bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes int count[kRelocMax]; 125bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 126bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 127bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic linker_stats_t linker_stats; 128bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 129bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind kind) { 130bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes ++linker_stats.count[kind]; 131bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 132bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 133bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind) { 134bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 1351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 138bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic unsigned bitmask[4096]; 139e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 140e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#define MARK(offset) \ 141e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland do { \ 142e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((((offset) >> 12) >> 5) < 4096) \ 143e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \ 144faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 145e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 146bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(offset) \ 147bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes do { \ 148bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ 149faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 150e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 151bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 152bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(x) do {} while (0) 1531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1554688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// You shouldn't try to call memory-allocating functions in the dynamic linker. 1564688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Guard against the most obvious ones. 1578f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes#define DISALLOW_ALLOCATION(return_type, name, ...) \ 1588f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes return_type name __VA_ARGS__ \ 1598f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes { \ 1604688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes const char* msg = "ERROR: " #name " called from the dynamic linker!\n"; \ 1618f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes __libc_format_log(ANDROID_LOG_FATAL, "linker", "%s", msg); \ 1628f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes write(2, msg, strlen(msg)); \ 1638f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes abort(); \ 1644688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 165812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, malloc, (size_t u __unused)); 166812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void, free, (void* u __unused)); 167812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, realloc, (void* u1 __unused, size_t u2 __unused)); 168812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, calloc, (size_t u1 __unused, size_t u2 __unused)); 1692e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 1700353195f344666256dba474a15c9ba22cf0cccc9Dima Zavinstatic char tmp_err_buf[768]; 1712e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavinstatic char __linker_dl_err_buf[768]; 1722e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 173650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hugheschar* linker_get_error_buffer() { 1745419b9474753d25dff947c7740532f86d130c0beElliott Hughes return &__linker_dl_err_buf[0]; 1752e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin} 1762e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 177650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughessize_t linker_get_error_buffer_size() { 178650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return sizeof(__linker_dl_err_buf); 179650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes} 180650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 1811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 1821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This function is an empty stub where GDB locates a breakpoint to get notified 1831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about linker activity. 1841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 1855419b9474753d25dff947c7740532f86d130c0beElliott Hughesextern "C" void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity(); 1861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1873a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic r_debug _r_debug = {1, NULL, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0}; 1883a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic link_map* r_debug_tail = 0; 1891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1903b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughesstatic pthread_mutex_t gDebugMutex = PTHREAD_MUTEX_INITIALIZER; 1911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1923a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic void insert_soinfo_into_debug_map(soinfo* info) { 193bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Copy the necessary fields into the debug structure. 1943a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 195ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov map->l_addr = info->load_bias; 196faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes map->l_name = reinterpret_cast<char*>(info->name); 1973a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes map->l_ld = info->dynamic; 1981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Stick the new library at the end of the list. 2001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * gdb tends to care more about libc than it does 2011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about leaf libraries, and ordering it this way 2021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * reduces the back-and-forth over the wire. 2031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 2041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (r_debug_tail) { 2051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail->l_next = map; 2061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = r_debug_tail; 2071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 2091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 2101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = 0; 2111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 2141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 216bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void remove_soinfo_from_debug_map(soinfo* info) { 2173a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 2185e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 219bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (r_debug_tail == map) { 2205e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev r_debug_tail = map->l_prev; 221bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2225e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 223bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_prev) { 224bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_prev->l_next = map->l_next; 225bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 226bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_next) { 227bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_next->l_prev = map->l_prev; 228bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2295e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2305e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 231bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_load(soinfo* info) { 2321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (info->flags & FLAG_EXE) { 2331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project // GDB already knows about the main executable 2341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 2351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2373b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes ScopedPthreadMutexLocker locker(&gDebugMutex); 2381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2393a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project insert_soinfo_into_debug_map(info); 2431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2443a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2465e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2475e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 248bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_unload(soinfo* info) { 2495e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev if (info->flags & FLAG_EXE) { 2505e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev // GDB already knows about the main executable 2515e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev return; 2525e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev } 2535e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2543b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes ScopedPthreadMutexLocker locker(&gDebugMutex); 2555e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2563a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_DELETE; 2575e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2585e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2595e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev remove_soinfo_from_debug_map(info); 2605e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2613a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2625e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 26518a206c81d9743481e364384affd43306911283dElliott Hughesvoid notify_gdb_of_libraries() { 2663a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2673a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2683a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2693a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 272ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic bool ensure_free_list_non_empty() { 273ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (gSoInfoFreeList != NULL) { 274ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return true; 275ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 276ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 277ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Allocate a new pool. 278ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo_pool_t* pool = reinterpret_cast<soinfo_pool_t*>(mmap(NULL, sizeof(*pool), 279ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn PROT_READ|PROT_WRITE, 280ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn MAP_PRIVATE|MAP_ANONYMOUS, 0, 0)); 281ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (pool == MAP_FAILED) { 282ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return false; 283ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 284ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 285ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Add the pool to our list of pools. 286ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn pool->next = gSoInfoPools; 287ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoPools = pool; 288ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 289ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Chain the entries in the new pool onto the free list. 290ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoFreeList = &pool->info[0]; 291ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo* next = NULL; 292ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn for (int i = SOINFO_PER_POOL - 1; i >= 0; --i) { 293ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn pool->info[i].next = next; 294ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn next = &pool->info[i]; 295ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 296ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 297ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return true; 298ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn} 2991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 300d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesstatic void set_soinfo_pool_protection(int protection) { 301d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes for (soinfo_pool_t* p = gSoInfoPools; p != NULL; p = p->next) { 302d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (mprotect(p, sizeof(*p), protection) == -1) { 303d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes abort(); // Can't happen. 304d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 305d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 306d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 307d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 308ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic soinfo* soinfo_alloc(const char* name) { 309ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (strlen(name) >= SOINFO_NAME_LEN) { 310ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("library name \"%s\" too long", name); 311ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 312ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 313ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 314ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (!ensure_free_list_non_empty()) { 315ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("out of memory when loading \"%s\"", name); 316ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 317ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 3181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 319ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Take the head element off the free list. 320ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn soinfo* si = gSoInfoFreeList; 321ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoFreeList = gSoInfoFreeList->next; 3221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 323ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Initialize the new element. 324ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn memset(si, 0, sizeof(soinfo)); 325ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn strlcpy(si->name, name, sizeof(si->name)); 326ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext->next = si; 327ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext = si; 3281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 329ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: allocated soinfo @ %p", name, si); 330ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return si; 3311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 333faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesstatic void soinfo_free(soinfo* si) { 3344688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (si == NULL) { 3354688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return; 3364688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 3374688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *prev = NULL, *trav; 3391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 340ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: freeing soinfo @ %p", si->name, si); 3411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 342d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (trav = solist; trav != NULL; trav = trav->next) { 3431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == si) 3441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 3451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev = trav; 3461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == NULL) { 348d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* si was not in solist */ 3494688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("name \"%s\" is not in solist!", si->name); 3501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 3511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 353be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner /* prev will never be NULL, because the first entry in solist is 3541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project always the static libdl_info. 3551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 3561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev->next = si->next; 357d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si == sonext) { 358d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom sonext = prev; 359d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 360ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn si->next = gSoInfoFreeList; 361ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn gSoInfoFreeList = si; 3621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 364cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 365cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_path(const char* path, const char* delimiters, 366cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes const char** array, char* buf, size_t buf_size, size_t max_count) { 367cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (path == NULL) { 368cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return; 369cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 370cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 371cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t len = strlcpy(buf, path, buf_size); 372cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 373cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t i = 0; 374cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes char* buf_p = buf; 375cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { 376cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (*array[i] != '\0') { 377cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes ++i; 378cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 379cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 380cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 381cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // Forget the last path if we had to truncate; this occurs if the 2nd to 382cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // last char isn't '\0' (i.e. wasn't originally a delimiter). 383cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { 384cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i - 1] = NULL; 385cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } else { 386cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i] = NULL; 387cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 388cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 389cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 390cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_LIBRARY_PATH(const char* path) { 391cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_path(path, ":", gLdPaths, 392cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes gLdPathsBuffer, sizeof(gLdPathsBuffer), LDPATH_MAX); 393cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 394cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 395cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_PRELOAD(const char* path) { 396cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // We have historically supported ':' as well as ' ' in LD_PRELOAD. 397cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_path(path, " :", gLdPreloadNames, 398cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes gLdPreloadsBuffer, sizeof(gLdPreloadsBuffer), LDPRELOAD_MAX); 399cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 400cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 4014eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 4024688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* For a given PC, find the .so that it belongs to. 4041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Returns the base address of the .ARM.exidx section 4051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * for that .so, and the number of 8-byte entries 4061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * in that section (via *pcount). 4071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 4081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Intended to be called by libc's __gnu_Unwind_Find_exidx(). 4091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 4103b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes * This function is exposed via dlfcn.cpp and libdl.so. 4111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 412faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 4131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned addr = (unsigned)pc; 4141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 415faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes for (soinfo* si = solist; si != 0; si = si->next) { 416468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich if ((addr >= si->base) && (addr < (si->base + si->size))) { 417468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich *pcount = si->ARM_exidx_count; 418f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee return (_Unwind_Ptr)si->ARM_exidx; 4191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 421faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes *pcount = 0; 4221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 4231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4244688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 42524053a461e7a20f34002262c1bb122023134989dChristopher Ferris#endif 4264688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Here, we only have to provide a callback to iterate across all the 4281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * loaded libraries. gcc_eh does the rest. */ 429faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesint dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) { 4301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int rv = 0; 431bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 432bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes dl_phdr_info dl_info; 4333a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_addr = si->link_map_head.l_addr; 4343a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_name = si->link_map_head.l_name; 4351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phdr = si->phdr; 4361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phnum = si->phnum; 437bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes rv = cb(&dl_info, sizeof(dl_phdr_info), data); 438bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (rv != 0) { 4391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 440bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 4411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return rv; 4431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4444688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 4450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) { 4460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 4470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const char* strtab = si->strtab; 4481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", 4500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); 4511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4520266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { 4530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = symtab + n; 4540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (strcmp(strtab + s->st_name, name)) continue; 4551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4560266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes /* only concern ourselves with global and weak symbol definitions */ 4570266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes switch (ELF_ST_BIND(s->st_info)) { 4580266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_GLOBAL: 4590266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_WEAK: 4600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (s->st_shndx == SHN_UNDEF) { 4610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes continue; 4620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4640266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", 4650266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(s->st_value), 4660266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<size_t>(s->st_size)); 4670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return s; 4681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4690266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4710266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return NULL; 4721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 474d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic unsigned elfhash(const char* _name) { 475faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const unsigned char* name = reinterpret_cast<const unsigned char*>(_name); 4761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned h = 0, g; 4771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 478faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes while (*name) { 4791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h = (h << 4) + *name++; 4801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project g = h & 0xf0000000; 4811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g; 4821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g >> 24; 4831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return h; 4851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, soinfo* needed[]) { 488943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan unsigned elf_hash = elfhash(name); 4890266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 4906ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 491c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si != NULL && somain != NULL) { 4925ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel /* 493c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Local scope is executable scope. Just start looking into it right away 494c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * for the shortcut. 4955ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel */ 4965ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 497c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si == somain) { 498c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 4995ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 500c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 5015ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel goto done; 5025ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 503c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } else { 504c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ 505c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 506c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 507c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with symbolic relocations disabled, the 508c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * first place to look to resolve external references is the main 509c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * executable. 510c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 511c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 512c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (!si->has_DT_SYMBOLIC) { 513ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s", 51461a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 515c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 516c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 517c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 518c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 519c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 520c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5215ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 522c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Look for symbols in the local scope (the object who is 5234eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes * searching). This happens with C++ templates on x86 for some 524c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * reason. 525c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * 526c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Notes on weak symbols: 527c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * The ELF specs are ambiguous about treatment of weak definitions in 528c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * dynamic linking. Some systems return the first definition found 529c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * and some the first non-weak definition. This is system dependent. 530c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Here we return the first definition found for simplicity. */ 531c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 532c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 533c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 534c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 535c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 536c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 537c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 538c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 539c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with -Bsymbolic and symbol is not found 540c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * in the local scope, try to find the symbol in the main executable. 541c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 542c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 543c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si->has_DT_SYMBOLIC) { 544ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s after local scope", 54561a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 546c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 547c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 548c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 549c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 550c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 551c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5525ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 553d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 5546ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5554fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer /* Next, look for it in the preloads list */ 556d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; gLdPreloads[i] != NULL; i++) { 557d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom s = soinfo_elf_lookup(gLdPreloads[i], elf_hash, name); 558d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 559d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom *lsi = gLdPreloads[i]; 5604fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer goto done; 5615ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5624fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 5634fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 564d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; needed[i] != NULL; i++) { 565ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in %s", 56661a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, needed[i]->name); 5675ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_elf_lookup(needed[i], elf_hash, name); 5685ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 5695ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel *lsi = needed[i]; 57012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel goto done; 5715ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5726ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5736ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5746ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchevdone: 575d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 576c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " 577c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes "found in %s, base = %p, load bias = %p", 578c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->name, name, reinterpret_cast<void*>(s->st_value), 579c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), 580c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>((*lsi)->load_bias)); 5816ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev return s; 5826ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5836ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 584943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan return NULL; 5856ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev} 5866ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 587d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3). It performs symbol lookup only within the 5886ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev specified soinfo object and not in any of its dependencies. 589d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 590d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom TODO: Only looking in the specified soinfo seems wrong. dlsym(3) says 591d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom that it should do a breadth first search through the dependency 592d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom tree. This agrees with the ELF spec (aka System V Application 593d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Binary Interface) where in Chapter 5 it discuss resolving "Shared 594d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Object Dependencies" in breadth first search order. 5956ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 5960266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dlsym_handle_lookup(soinfo* si, const char* name) { 59716084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner return soinfo_elf_lookup(si, elfhash(name), name); 5981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 5991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 600d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3) to performs a global symbol lookup. If the 601d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom start value is null (for RTLD_DEFAULT), the search starts at the 602d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom beginning of the global solist. Otherwise the search starts at the 603d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom specified soinfo (for RTLD_NEXT). 6046ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 6050266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start) { 606cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes unsigned elf_hash = elfhash(name); 6071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 608cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (start == NULL) { 609cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes start = solist; 610cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6111698d9ebfc7e27271852a1fdf305a2ac37b3ebe4Matt Fischer 6120266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 613cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { 614cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes s = soinfo_elf_lookup(si, elf_hash, name); 615cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 616cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes *found = si; 617cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes break; 6181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 619cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 621cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 622c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", 623c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); 624cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 6251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 626cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return s; 6271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 629fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Chengsoinfo* find_containing_library(const void* p) { 6300266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) address = reinterpret_cast<ElfW(Addr)>(p); 631fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (soinfo* si = solist; si != NULL; si = si->next) { 632fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (address >= si->base && address - si->base < si->size) { 633fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return si; 634e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 635fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 636fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 637e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 638e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 6390266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dladdr_find_symbol(soinfo* si, const void* addr) { 6400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) soaddr = reinterpret_cast<ElfW(Addr)>(addr) - si->base; 641fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 642fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // Search the library's symbol table for any defined symbol which 643fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // contains this address. 644fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (size_t i = 0; i < si->nchain; ++i) { 6450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = &si->symtab[i]; 646fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (sym->st_shndx != SHN_UNDEF && 647fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr >= sym->st_value && 648fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr < sym->st_value + sym->st_size) { 649fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return sym; 650e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 651fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 652e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 653fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 654e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 655e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 656124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library_on_path(const char* name, const char* const paths[]) { 657124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes char buf[512]; 658124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes for (size_t i = 0; paths[i] != NULL; ++i) { 6591e980b6bc8315d00a07312b25486531247abd98cElliott Hughes int n = __libc_format_buffer(buf, sizeof(buf), "%s/%s", paths[i], name); 660124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (n < 0 || n >= static_cast<int>(sizeof(buf))) { 661ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); 662124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes continue; 6631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 664124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); 665124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd != -1) { 666124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 667124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 668124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 669124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return -1; 6701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 672124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library(const char* name) { 673ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ opening %s ]", name); 6741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 675124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // If the name contains a slash, we should attempt to open it directly and not search the paths. 676124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (strchr(name, '/') != NULL) { 6776971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); 6786971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes if (fd != -1) { 6796971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes return fd; 6806971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes } 6816971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. 6825ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#if defined(__LP64__) 6835ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov return -1; 6845ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#endif 685124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 6861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 687124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. 688124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = open_library_on_path(name, gLdPaths); 689124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd == -1) { 690a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes fd = open_library_on_path(name, gDefaultLdPaths); 691124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 692124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 6931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 69512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles)static soinfo* load_library(const char* name, const android_dlextinfo* extinfo) { 6964688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Open the file. 697650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes int fd = open_library(name); 698650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (fd == -1) { 6994688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("library \"%s\" not found", name); 7001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 7012e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin } 7021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 703650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes // Read the ELF header and load the segments. 704650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ElfReader elf_reader(name, fd); 70512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) if (!elf_reader.Load(extinfo)) { 7064688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 70723363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 70823363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner 709650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes const char* bname = strrchr(name, '/'); 710650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes soinfo* si = soinfo_alloc(bname ? bname + 1 : name); 711650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (si == NULL) { 7124688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 71323363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 714650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->base = elf_reader.load_start(); 715650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->size = elf_reader.load_size(); 716650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->load_bias = elf_reader.load_bias(); 717650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->flags = 0; 718650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->entry = 0; 719650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->dynamic = NULL; 720650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phnum = elf_reader.phdr_count(); 721650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phdr = elf_reader.loaded_phdr(); 722650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return si; 7231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 725faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesstatic soinfo *find_loaded_library(const char* name) { 72612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel // TODO: don't use basename only for determining libraries 72712c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel // http://code.google.com/p/android/issues/detail?id=6670 72812c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 729faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* bname = strrchr(name, '/'); 73012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel bname = bname ? bname + 1 : name; 73112c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 732faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 733d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (!strcmp(bname, si->name)) { 73412c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel return si; 73512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 73612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 73712c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel return NULL; 73812c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel} 73912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 74012bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles)static soinfo* find_library_internal(const char* name, const android_dlextinfo* extinfo) { 741d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (name == NULL) { 742d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return somain; 743d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 744d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 745d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo* si = find_loaded_library(name); 746d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 747d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_LINKED) { 748d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 749d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 750d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes DL_ERR("OOPS: recursive link to \"%s\"", si->name); 751d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return NULL; 752d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 75312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 754ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ '%s' has not been loaded yet. Locating...]", name); 75512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) si = load_library(name, extinfo); 756cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (si == NULL) { 757cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return NULL; 758cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 759cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 760cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // At this point we know that whatever is loaded @ base is a valid ELF 761cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // shared library whose segments are properly mapped in. 7625ceb889ac9a36e74e4e00c34c57cbb58d73e228cWeiwu Chen TRACE("[ find_library_internal base=%p size=%zu name='%s' ]", 763c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->size, si->name); 764cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 765183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(si, extinfo)) { 766cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes munmap(reinterpret_cast<void*>(si->base), si->size); 767cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes soinfo_free(si); 768cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return NULL; 769d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 7706774809b6249d9d4efd982b6e3ca377c84482d9aDavid 'Digit' Turner 771d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 772d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 773d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 77412bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles)static soinfo* find_library(const char* name, const android_dlextinfo* extinfo) { 77512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* si = find_library_internal(name, extinfo); 776d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 777ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count++; 778d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 779d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 780d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 781d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 782d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesstatic int soinfo_unload(soinfo* si) { 783ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (si->ref_count == 1) { 784ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("unloading '%s'", si->name); 785d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallDestructors(); 786d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 7870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 788d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 789d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 7908147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("%s needs to unload %s", si->name, library_name); 7918147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes soinfo_unload(find_loaded_library(library_name)); 792d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 7931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 7941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 795d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes munmap(reinterpret_cast<void*>(si->base), si->size); 796d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes notify_gdb_of_unload(si); 797d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo_free(si); 798ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 0; 799d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } else { 800ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count--; 801c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("not unloading '%s', decrementing ref_count to %zd", si->name, si->ref_count); 802d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 803d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return 0; 8041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 806a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesvoid do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 807a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes snprintf(buffer, buffer_size, "%s:%s", gDefaultLdPaths[0], gDefaultLdPaths[1]); 808a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes} 809a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 810cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesvoid do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 811cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (!get_AT_SECURE()) { 812cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_LD_LIBRARY_PATH(ld_library_path); 813cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 814cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 815cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 816012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)soinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) { 817e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL)) != 0) { 818e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes DL_ERR("invalid flags to dlopen: %x", flags); 819e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes return NULL; 820e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes } 821012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) { 822012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) DL_ERR("invalid extended flags to android_dlopen_ext: %x", extinfo->flags); 823012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) return NULL; 824012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) } 825d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ | PROT_WRITE); 82612bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* si = find_library(name, extinfo); 827d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 828d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 829d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 830d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ); 831d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 832d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 8331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 834d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesint do_dlclose(soinfo* si) { 835d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ | PROT_WRITE); 836d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes int result = soinfo_unload(si); 837d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes set_soinfo_pool_protection(PROT_READ); 838d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return result; 8391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 8401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 8414eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 8429918665a45095ad135576f005c0e5307feb366a1Chris Dearmanstatic int soinfo_relocate(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) { 8430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 844c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes soinfo* lsi; 845c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 846c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rela) { 8470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rela->r_info); 8480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rela->r_info); 8490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rela->r_offset + si->load_bias); 8500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 851faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 852c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 853c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 854c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (type == 0) { // R_*_NONE 855c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes continue; 856c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 857c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym != 0) { 858c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 859c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = soinfo_do_lookup(si, sym_name, &lsi, needed); 860c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (s == NULL) { 861c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We only allow an undefined symbol if this is a weak reference... 862c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 863c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 864c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 865c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 866c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 867c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 868c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes /* IHI0044C AAELF 4.5.1.1: 869c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 870c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Libraries are not searched to resolve weak references. 871c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes It is not an error for a weak reference to remain unsatisfied. 872c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 873c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes During linking, the value of an undefined weak reference is: 874c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - Zero if the relocation type is absolute 875c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of the place if the relocation is pc-relative 876c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of nominal base address if the relocation 877c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes type is base-relative. 878c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes */ 879c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 880c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 881e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 882e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 883e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 884e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 885e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 886e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 887e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 888e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 889e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * The sym_addr was initialized to be zero above, or the relocation 890e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * code below does not care about value of sym_addr. 891e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * No need to do anything. 892e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 893e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 894e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 895c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 896c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 897c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 898c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 899c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // No need to do anything. 900c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 901c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 902c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_addr = reloc; 903c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 9044eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 905c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 906faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rela, idx); 907c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 908c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 909c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 910c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We got a definition. 9110266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 912c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 913c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocSymbol); 914c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 915c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = NULL; 916c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 917c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 918c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 919e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 920e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 921e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 922e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9230266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %16llx <- %16llx %s\n", 9240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9250266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 926e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 927e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 928e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 929e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9300266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %16llx <- %16llx %s\n", 9310266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9320266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 933e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 934e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 935e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 936e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS64 %16llx <- %16llx %s\n", 9380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 940e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 941e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 942e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 943e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS32 %16llx <- %16llx %s\n", 9450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 9470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 9480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 949e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9500266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9510266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 9520266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 9530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 954e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 955e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 956e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 957e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 958e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 959e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS16 %16llx <- %16llx %s\n", 9610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 9630266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 9640266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 965e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9660266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 9680266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 9690266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 970e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 971e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 972e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 973e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL64: 974e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 975e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL64 %16llx <- %16llx - %16llx %s\n", 9770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 9780266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend) - rela->r_offset; 979e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 980e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL32: 981e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 982e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %16llx <- %16llx - %16llx %s\n", 9840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 9850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 9860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 9870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 988e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9890266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 9910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 9920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 993e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 994e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 995e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 996e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL16: 997e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 998e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL16 %16llx <- %16llx - %16llx %s\n", 10000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 10010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 10020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 10030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 1004e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 10050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 10060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 10070266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 10080266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 1009e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1010e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1011e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1012e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1013e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 1014e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 1015e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 1016e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (sym) { 1017e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("odd RELATIVE form..."); 1018e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1019e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 10200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %16llx <- %16llx\n", 10210266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (si->base + rela->r_addend)); 10220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (si->base + rela->r_addend); 1023e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1024e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1025e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_COPY: 1026b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov /* 1027b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * ET_EXEC is not supported so this should not happen. 1028b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * 1029b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 1030b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * 1031b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * Section 4.7.1.10 "Dynamic relocations" 1032b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * R_AARCH64_COPY may only appear in executable objects where e_type is 1033b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * set to ET_EXEC. 1034b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * 1035b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * FLAG_EXE is set for both ET_DYN and ET_EXEC executables. 1036b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * We should explicitly disallow ET_DYN executables from having 1037b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * R_AARCH64_COPY relocations. 1038b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov */ 1039b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov DL_ERR("%s R_AARCH64_COPY relocations are not supported", si->name); 1040b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov return -1; 1041e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_TPREL64: 10420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16llx <- %16llx - %16llx\n", 10430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1044e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1045e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_DTPREL32: 10460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16llx <- %16llx - %16llx\n", 10470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1048e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1049e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 1050c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 1051c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1052c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1053c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1054c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 10550266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1056c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1057c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 1058c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1059c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1060c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1061c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 10620266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1063c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1064c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 1065c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1066c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1067c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym) { 1068c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("odd RELATIVE form..."); 1069c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1070c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1071c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), 1072c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(si->base)); 10730266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = si->base + rela->r_addend; 1074c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1075c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 1076c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1077c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1078c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1079c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), sym_name); 10800266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1081c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1082c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin case R_X86_64_64: 1083c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin count_relocation(kRelocRelative); 1084c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin MARK(rela->r_offset); 1085c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1086c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin static_cast<size_t>(sym_addr), sym_name); 10870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1088c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin break; 1089c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 1090c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1091c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1092c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", 1093c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), 1094c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), static_cast<size_t>(reloc), sym_name); 10950266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend - reloc; 1096c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 10974eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1098e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1099c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 1100faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rela, idx); 1101c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1102c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1103c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1104c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return 0; 1105c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes} 11069918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11079918665a45095ad135576f005c0e5307feb366a1Chris Dearman#else // REL, not RELA. 11089918665a45095ad135576f005c0e5307feb366a1Chris Dearman 11090266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic int soinfo_relocate(soinfo* si, ElfW(Rel)* rel, unsigned count, soinfo* needed[]) { 11100266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 1111d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 11121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 11134688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rel) { 11140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rel->r_info); 11150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes // TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead. 11160266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rel->r_info); 11170266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + si->load_bias); 11180266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 1119faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 11201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1121c620059479c47a78d57086d73726c9adc2f337adElliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 1122d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (type == 0) { // R_*_NONE 1123d7daacb46372132ae3f0121647074936c304b572Raghu Gandham continue; 1124d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1125d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (sym != 0) { 1126c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 11275ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1128d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s == NULL) { 11294eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We only allow an undefined symbol if this is a weak reference... 1130c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 1131c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 1132e9b6fc6f82276188404a2839e31a2f4c19f6c336Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 1133e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1134e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1135e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1136e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan /* IHI0044C AAELF 4.5.1.1: 1137e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1138e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan Libraries are not searched to resolve weak references. 1139e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan It is not an error for a weak reference to remain 1140e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan unsatisfied. 1141e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1142e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan During linking, the value of an undefined weak reference is: 1143e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - Zero if the relocation type is absolute 1144e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - The address of the place if the relocation is pc-relative 1145bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes - The address of nominal base address if the relocation 1146e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan type is base-relative. 1147e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan */ 1148e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1149e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan switch (type) { 11504eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1151e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_JUMP_SLOT: 1152e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_GLOB_DAT: 1153e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_ABS32: 1154e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_RELATIVE: /* Don't care. */ 11554eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 11564eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 11574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 11584eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 11594eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 1160d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case R_386_JMP_SLOT: 1161e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_GLOB_DAT: 1162e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_32: 1163c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_386_RELATIVE: /* Don't care. */ 11644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 11654eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 11664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 1167e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 1168e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_PC32: 1169e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan sym_addr = reloc; 1170e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 11714eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1172e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 11734eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1174e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_COPY: 11754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // Fall through. Can't really copy if weak symbol is not found at run-time. 11764eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1177e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan default: 1178faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rel, idx); 1179e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1180e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1181e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } else { 11824eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We got a definition. 11830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 1184d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1185bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocSymbol); 11861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1187e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan s = NULL; 11881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 11891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1190c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 11914eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 11921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_JUMP_SLOT: 1193bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 11941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1195ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 11960266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 11971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 11981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_GLOB_DAT: 1199bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1201ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 12020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_ABS32: 1205bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 12061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1207ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO ABS %08x <- %08x %s", reloc, sym_addr, sym_name); 12080266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 121034ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner case R_ARM_REL32: 1211bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocRelative); 121234ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner MARK(rel->r_offset); 1213ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", 121434ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner reloc, sym_addr, rel->r_offset, sym_name); 12150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr - rel->r_offset; 121634ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner break; 12171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_COPY: 1218b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov /* 1219b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 1220b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * 1221b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * Section 4.7.1.10 "Dynamic relocations" 1222b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * R_ARM_COPY may only appear in executable objects where e_type is 1223b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * set to ET_EXEC. 1224b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * 1225b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * We explicitly disallow ET_DYN executables from having 1226b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov * R_ARM_COPY relocations. 1227b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov */ 1228b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov DL_ERR("%s R_ARM_COPY relocations are not supported", si->name); 1229b906e13c55c9fe9b4157ba548534a0230434882bDmitriy Ivanov return -1; 12304eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 12314eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_JMP_SLOT: 12324eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12334eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12344eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 12350266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12364eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12374eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_GLOB_DAT: 12384eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12394eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12404eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 12410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12424eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12434eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_32: 12444eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 12454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12464eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_32 %08x <- +%08x %s", reloc, sym_addr, sym_name); 12470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12484eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12494eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_PC32: 12504eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 12514eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12524eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", 12534eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); 12540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr - reloc); 12554eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12564eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__mips__) 12574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_MIPS_REL32: 12589918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__LP64__) 12599918665a45095ad135576f005c0e5307feb366a1Chris Dearman // MIPS Elf64_Rel entries contain compound relocations 12609918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case 12619918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || 12629918665a45095ad135576f005c0e5307feb366a1Chris Dearman ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { 1263faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)", 12649918665a45095ad135576f005c0e5307feb366a1Chris Dearman type, (unsigned)ELF64_R_TYPE2(rel->r_info), 1265faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (unsigned)ELF64_R_TYPE3(rel->r_info), rel, idx); 12669918665a45095ad135576f005c0e5307feb366a1Chris Dearman return -1; 12679918665a45095ad135576f005c0e5307feb366a1Chris Dearman } 12689918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 12694eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12704eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12719918665a45095ad135576f005c0e5307feb366a1Chris Dearman TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), 12729918665a45095ad135576f005c0e5307feb366a1Chris Dearman static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); 12734eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (s) { 12740266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } else { 12760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 12774eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 12784eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12794eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 12804eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes 12814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 12824eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_ARM_RELATIVE: 12834eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 12844eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_RELATIVE: 12854eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 12864eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 12874eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12884eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (sym) { 12894eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("odd RELATIVE form..."); 12904eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes return -1; 12914eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 12924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", 12934eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); 12940266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 12954eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 12971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project default: 1298faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx); 12991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 13001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 13031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1304c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 13051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13064eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 130787c358524e479235aa6241736d2ce325f89daafcBrian Carlstromstatic bool mips_relocate_got(soinfo* si, soinfo* needed[]) { 13089918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Addr)** got = si->plt_got; 130987c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (got == NULL) { 131087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 131187c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom } 131287c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned local_gotno = si->mips_local_gotno; 131387c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned gotsym = si->mips_gotsym; 131487c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned symtabno = si->mips_symtabno; 13150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 1316d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 13179918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[0] is the address of the lazy resolver function. 13189918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[1] may be used for a GNU extension. 13199918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start). 13209918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: maybe this should be in a separate routine? 1321d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if ((si->flags & FLAG_LINKER) == 0) { 132287c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom size_t g = 0; 13239918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef); 13249918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (reinterpret_cast<intptr_t>(got[g]) < 0) { 13259918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed); 1326d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 13279918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Relocate the local GOT entries. 1328d7daacb46372132ae3f0121647074936c304b572Raghu Gandham for (; g < local_gotno; g++) { 13299918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + si->load_bias); 1330d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1331d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1332d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 13339918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Now for the global GOT entries... 13340266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = symtab + gotsym; 1335d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got = si->plt_got + local_gotno; 133687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { 13379918665a45095ad135576f005c0e5307feb366a1Chris Dearman // This is an undefined reference... try to locate it. 13389918665a45095ad135576f005c0e5307feb366a1Chris Dearman const char* sym_name = si->strtab + sym->st_name; 1339d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 13409918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1341d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (s == NULL) { 13429918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only allow an undefined symbol if this is a weak reference. 1343d7daacb46372132ae3f0121647074936c304b572Raghu Gandham s = &symtab[g]; 1344c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 13454688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot locate \"%s\"...", sym_name); 134687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return false; 1347d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1348d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *got = 0; 13499918665a45095ad135576f005c0e5307feb366a1Chris Dearman } else { 13509918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: is this sufficient? 13519918665a45095ad135576f005c0e5307feb366a1Chris Dearman // For reference see NetBSD link loader 13529918665a45095ad135576f005c0e5307feb366a1Chris Dearman // http://cvsweb.netbsd.org/bsdweb.cgi/src/libexec/ld.elf_so/arch/mips/mips_reloc.c?rev=1.53&content-type=text/x-cvsweb-markup 13539918665a45095ad135576f005c0e5307feb366a1Chris Dearman *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value); 1354d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1355d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 135687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 1357d7daacb46372132ae3f0121647074936c304b572Raghu Gandham} 1358d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1359d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1360812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallArray(const char* array_name __unused, linker_function_t* functions, size_t count, bool reverse) { 1361ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (functions == NULL) { 1362d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1363d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 13648215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1365c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("[ Calling %s (size %zd) @ %p for '%s' ]", array_name, count, functions, name); 13668215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1367ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int begin = reverse ? (count - 1) : 0; 1368ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int end = reverse ? -1 : count; 1369ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int step = reverse ? -1 : 1; 13708215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1371ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (int i = begin; i != end; i += step) { 1372ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); 1373ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes CallFunction("function", functions[i]); 1374d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1375d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1376ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s for '%s' ]", array_name, name); 13771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 13781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1379812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallFunction(const char* function_name __unused, linker_function_t function) { 1380db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) { 1381d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1382d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1383d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1384ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); 1385d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes function(); 1386ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); 1387db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes 1388db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures 1389db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // are still writable. This happens with our debug malloc (see http://b/7941716). 1390db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes set_soinfo_pool_protection(PROT_READ | PROT_WRITE); 13919181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov} 13929181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 1393d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallPreInitConstructors() { 13948147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_PREINIT_ARRAY functions are called before any other constructors for executables, 13958147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // but ignored in a shared library. 1396d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); 1397d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 1398e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1399d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallConstructors() { 1400d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (constructors_called) { 1401d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1402d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1403e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1404d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // We set constructors_called before actually calling the constructors, otherwise it doesn't 1405d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // protect against recursive constructor calls. One simple example of constructor recursion 1406d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: 1407d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 1. The program depends on libc, so libc's constructor is called here. 1408d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. 1409d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 3. dlopen() calls the constructors on the newly created 1410d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // soinfo for libc_malloc_debug_leak.so. 1411d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 4. The debug .so depends on libc, so CallConstructors is 1412d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // called again with the libc soinfo. If it doesn't trigger the early- 1413d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // out above, the libc constructor will be called again (recursively!). 1414d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes constructors_called = true; 1415d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 14168147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { 14178147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // The GNU dynamic linker silently ignores these, but we warn the developer. 1418c620059479c47a78d57086d73726c9adc2f337adElliott Hughes PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", 14198147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes name, preinit_array_count); 1420d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1422d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (dynamic != NULL) { 14230266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = dynamic; d->d_tag != DT_NULL; ++d) { 1424d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1425d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = strtab + d->d_un.d_val; 14268147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors in DT_NEEDED \"%s\"", name, library_name); 14278147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes find_loaded_library(library_name)->CallConstructors(); 1428d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1430d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14328147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors", name); 14338147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14348147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_INIT should be called before DT_INIT_ARRAY if both are present. 1435d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_INIT", init_func); 1436d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); 1437e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov} 14388215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1439d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallDestructors() { 14408147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling destructors", name); 14418147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14428147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI_ARRAY must be parsed in reverse order. 1443d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); 14448147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14458147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI should be called after DT_FINI_ARRAY if both are present. 1446d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_FINI", fini_func); 14471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 14481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Force any of the closed stdin, stdout and stderr to be associated with 14501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /dev/null. */ 14515419b9474753d25dff947c7740532f86d130c0beElliott Hughesstatic int nullify_closed_stdio() { 14521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int dev_null, i, status; 14531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int return_value = 0; 14541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 145516084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR)); 14561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null < 0) { 14574688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot open /dev/null: %s", strerror(errno)); 14581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 14591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1460ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); 14611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If any of the stdio file descriptors is valid and not associated 14631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project with /dev/null, dup /dev/null to it. */ 14641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for (i = 0; i < 3; i++) { 14651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If it is /dev/null already, we are done. */ 14664688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (i == dev_null) { 14671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 14684688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 14691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1470ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Nullifying stdio file descriptor %d]", i); 14714688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); 14721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14734688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes /* If file is opened, we are good. */ 14744688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status != -1) { 14754688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes continue; 14764688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 14771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* The only error we allow is that the file descriptor does not 14791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project exist, in which case we dup /dev/null to it. */ 14801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (errno != EBADF) { 14814688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("fcntl failed: %s", strerror(errno)); 14821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 14831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 14841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 14851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Try dupping /dev/null to this stdio file descriptor and 14871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project repeat if there is a signal. Note that any errors in closing 14881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project the stdio descriptor are lost. */ 14894688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); 14901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (status < 0) { 14914688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("dup2 failed: %s", strerror(errno)); 14921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 14931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 14941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 14951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 14961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If /dev/null is not one of the stdio file descriptors, close it. */ 14981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null > 2) { 1499ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); 15004688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(close(dev_null)); 15014688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status == -1) { 15024688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("close failed: %s", strerror(errno)); 15031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 15041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return return_value; 15081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 15091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1510183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo) { 1511f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee /* "base" might wrap around UINT32_MAX. */ 15120266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) base = si->load_bias; 15130266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr = si->phdr; 15141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int phnum = si->phnum; 1515d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom bool relocating_linker = (si->flags & FLAG_LINKER) != 0; 15161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1517b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can't debug anything until the linker is relocated */ 1518b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1519ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ linking %s ]", si->name); 1520c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p si->flags = 0x%08x", reinterpret_cast<void*>(si->base), si->flags); 1521b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 15221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 152363f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner /* Extract dynamic section */ 1524124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes size_t dynamic_count; 15250266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Word) dynamic_flags; 152612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, 1527cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman &dynamic_count, &dynamic_flags); 152863f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner if (si->dynamic == NULL) { 1529b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1530124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); 1531b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 1532124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 153363f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } else { 1534b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1535ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("dynamic = %p", si->dynamic); 1536b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 153763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } 153863f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 15394eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 154063f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner (void) phdr_table_get_arm_exidx(phdr, phnum, base, 154163f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner &si->ARM_exidx, &si->ARM_exidx_count); 154263f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner#endif 154363f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 15448147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // Extract useful information from dynamic section. 1545d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom uint32_t needed_count = 0; 15460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1547c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", 1548c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1549c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (d->d_tag) { 15501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_HASH: 1551faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nbucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[0]; 1552faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nchain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[1]; 1553faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->bucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8); 1554faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->chain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8 + si->nbucket * 4); 15551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_STRTAB: 1557faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->strtab = reinterpret_cast<const char*>(base + d->d_un.d_ptr); 15581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_SYMTAB: 1560faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->symtab = reinterpret_cast<ElfW(Sym)*>(base + d->d_un.d_ptr); 15611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if !defined(__LP64__) 15631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTREL: 1564d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val != DT_REL) { 1565124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1566124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 15671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1569c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 15701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_JMPREL: 15714eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1572faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1573c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1574faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1575c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 15761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTRELSZ: 15784eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 15790266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1580c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 15810266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1582c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 15831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15849918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__mips__) 15851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTGOT: 15869918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Used by mips and mips64. 15879918665a45095ad135576f005c0e5307feb366a1Chris Dearman si->plt_got = reinterpret_cast<ElfW(Addr)**>(base + d->d_un.d_ptr); 15881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1589c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 15901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_DEBUG: 1591bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_DEBUG entry to the address of _r_debug for GDB 1592cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman // if the dynamic table is writable 15939918665a45095ad135576f005c0e5307feb366a1Chris Dearman// FIXME: not working currently for N64 15949918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The flags for the LOAD and DYNAMIC program headers do not agree. 15959918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The LOAD section containng the dynamic table has been mapped as 15969918665a45095ad135576f005c0e5307feb366a1Chris Dearman// read-only, but the DYNAMIC header claims it is writable. 15979918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if !(defined(__mips__) && defined(__LP64__)) 159899c32055cb50443f722c55914869c1f6bb941959Elliott Hughes if ((dynamic_flags & PF_W) != 0) { 1599c620059479c47a78d57086d73726c9adc2f337adElliott Hughes d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); 160099c32055cb50443f722c55914869c1f6bb941959Elliott Hughes } 16011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16029918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 16034eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1604c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELA: 1605faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1606c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1607c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELASZ: 16080266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1609c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1610c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1611c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_REL in \"%s\"", si->name); 1612c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1613c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 1614c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); 1615c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1616c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1617c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1618faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1619c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1620c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 16210266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1622c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1623ad13c57298e57d33c130fb03a2c6494da573408cShin-ichiro KAWASAKI case DT_RELA: 1624124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1625124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1626c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT: 1628ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 16298147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT) found at %p", si->name, si->init_func); 16301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI: 1632ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 16338147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI) found at %p", si->name, si->fini_func); 16341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAY: 1636ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 16378147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT_ARRAY) found at %p", si->name, si->init_array); 16381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAYSZ: 16400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->init_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 16411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAY: 1643ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 16448147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI_ARRAY) found at %p", si->name, si->fini_array); 16451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAYSZ: 16470266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->fini_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 16481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAY: 1650ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->preinit_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 16518147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_PREINIT_ARRAY) found at %p", si->name, si->preinit_array); 16521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAYSZ: 16540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 16551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_TEXTREL: 1657e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1658e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1659e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1660e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 16615135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->has_text_relocations = true; 16621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1663e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 16645ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_SYMBOLIC: 16655ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 16665ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 1667d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom case DT_NEEDED: 1668d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom ++needed_count; 1669d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom break; 16705ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_FLAGS: 1671d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_TEXTREL) { 1672e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1673e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1674e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1675e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 16765ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_text_relocations = true; 1677e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 16785ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 1679d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_SYMBOLIC) { 16805ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 16815ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 16825ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 16834eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 1684d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_STRSZ: 1685d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_SYMENT: 1686d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_RELENT: 1687d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1688d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_MAP: 1689bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB. 1690d7daacb46372132ae3f0121647074936c304b572Raghu Gandham { 1691006f9ad8910c945cd50e54f6c34d8c27b11c1193Benjamin Adolphi r_debug** dp = reinterpret_cast<r_debug**>(base + d->d_un.d_ptr); 1692d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *dp = &_r_debug; 1693d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1694d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1695d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_VERSION: 1696d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_FLAGS: 1697d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_BASE_ADDRESS: 1698d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_UNREFEXTNO: 1699d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1700d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1701d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_SYMTABNO: 1702d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_symtabno = d->d_un.d_val; 1703d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1704d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1705d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_LOCAL_GOTNO: 1706d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_local_gotno = d->d_un.d_val; 1707d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1708d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1709d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_GOTSYM: 1710d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_gotsym = d->d_un.d_val; 1711d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 17124eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1713d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1714d7daacb46372132ae3f0121647074936c304b572Raghu Gandham default: 17154eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DEBUG("Unused DT entry: type %p arg %p", 17164eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1717d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 17181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1721c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", 1722c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->strtab, si->symtab); 17231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1724124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Sanity checks. 1725d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (relocating_linker && needed_count != 0) { 1726d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); 1727d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom return false; 1728d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 1729124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->nbucket == 0) { 1730124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); 1731124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1732124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1733124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->strtab == 0) { 1734124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); 1735124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1736124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1737124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->symtab == 0) { 1738124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); 1739124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 17401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 17427e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // If this is the main executable, then load all of the libraries from LD_PRELOAD now. 1743d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_EXE) { 1744d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom memset(gLdPreloads, 0, sizeof(gLdPreloads)); 17457e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes size_t preload_count = 0; 1746d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes for (size_t i = 0; gLdPreloadNames[i] != NULL; i++) { 174712bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* lsi = find_library(gLdPreloadNames[i], NULL); 17487e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes if (lsi != NULL) { 17497e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes gLdPreloads[preload_count++] = lsi; 17507e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes } else { 17517e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // As with glibc, failure to load an LD_PRELOAD library is just a warning. 17527e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", 17537e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes gLdPreloadNames[i], si->name, linker_get_error_buffer()); 17544fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 17554fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 17564fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 17574fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1758faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes soinfo** needed = reinterpret_cast<soinfo**>(alloca((1 + needed_count) * sizeof(soinfo*))); 1759d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo** pneeded = needed; 176012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 17610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1762d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1763d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 1764ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s needs %s", si->name, library_name); 176512bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* lsi = find_library(library_name, NULL); 1766d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (lsi == NULL) { 1767650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); 17684688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("could not load library \"%s\" needed by \"%s\"; caused by %s", 1769d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom library_name, si->name, tmp_err_buf); 1770124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 17711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 177212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded++ = lsi; 17731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 177512c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded = NULL; 17761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1777e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 17785135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1779e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // Make segments writable to allow text relocations to work properly. We will later call 1780e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // phdr_table_protect_segments() after all of them are applied and all constructors are run. 1781865119efd47ae3cae5a0c09c6a9cc184a10614c1Du Chenyang#if !defined(__i386__) // The platform itself has too many text relocations on x86. 17823d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich DL_WARN("%s has text relocations. This is wasting memory and prevents " 17833d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich "security hardening. Please fix.", si->name); 1784865119efd47ae3cae5a0c09c6a9cc184a10614c1Du Chenyang#endif 17855135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 17865135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't unprotect loadable segments for \"%s\": %s", 17875135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1788124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 17895135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 17905135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 1791e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 17925135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich 17934eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1794c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->plt_rela != NULL) { 1795faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]\n", si->name); 17969918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) { 1797c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1798c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1799c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1800c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->rela != NULL) { 1801faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]\n", si->name); 18029918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->rela, si->rela_count, needed)) { 1803c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1804c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1805c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1806c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1807d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->plt_rel != NULL) { 1808faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]", si->name); 1809d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { 1810124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1811124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 18121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1813d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->rel != NULL) { 1814faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]", si->name); 1815d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { 1816124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1817124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 18181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1819c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 18201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 18214eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 182287c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (!mips_relocate_got(si, needed)) { 1823124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1824d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1825d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1826d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 18271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_LINKED; 1828ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ finished linking %s ]", si->name); 18291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1830e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 18315135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1832e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // All relocations are done, we can protect our segments back to read-only. 18335135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 18345135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't protect segments for \"%s\": %s", 18355135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1836124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18375135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 18381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1839e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1841b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can also turn on GNU RELRO protection */ 1842b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) { 18434688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", 18444688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes si->name, strerror(errno)); 1845124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18469ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich } 18479ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich 1848183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) /* Handle serializing/sharing the RELRO segment */ 1849183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (extinfo && (extinfo->flags & ANDROID_DLEXT_WRITE_RELRO)) { 1850183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_serialize_gnu_relro(si->phdr, si->phnum, si->load_bias, 1851183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 1852183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed serializing GNU RELRO section for \"%s\": %s", 1853183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 1854183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 1855183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1856183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } else if (extinfo && (extinfo->flags & ANDROID_DLEXT_USE_RELRO)) { 1857183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_map_gnu_relro(si->phdr, si->phnum, si->load_bias, 1858183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 1859183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed mapping GNU RELRO section for \"%s\": %s", 1860183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 1861183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 1862183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1863183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1864183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 18651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project notify_gdb_of_load(si); 1866124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return true; 18671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 18681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1869468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 1870c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * This function add vdso to internal dso list. 1871c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * It helps to stack unwinding through signal handlers. 1872c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * Also, it makes bionic more like glibc. 1873c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov */ 1874812fd4263a005b88f3b4222baa910114f938d594Kito Chengstatic void add_vdso(KernelArgumentBlock& args __unused) { 18754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(AT_SYSINFO_EHDR) 18760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(args.getauxval(AT_SYSINFO_EHDR)); 18770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (ehdr_vdso == NULL) { 18780266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return; 18790266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 1880c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 18810266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes soinfo* si = soinfo_alloc("[vdso]"); 1882ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 18830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); 18840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phnum = ehdr_vdso->e_phnum; 18850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(ehdr_vdso); 18860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->size = phdr_table_get_load_size(si->phdr, si->phnum); 18870266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->flags = 0; 18880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = get_elf_exec_load_bias(ehdr_vdso); 1889ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 18900dcf06f976670b5d05286b184d150f61b71c1184Torne (Richard Coles) soinfo_link_image(si, NULL); 1891c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov#endif 1892c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov} 1893c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 1894c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov/* 1895468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This code is called after the linker has linked itself and 1896468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * fixed it's own GOT. It is safe to make references to externs 1897468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * and other non-local data at this point. 1898468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 18990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(Addr) linker_base) { 190042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes /* NOTE: we store the args pointer on a special location 1901ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * of the temporary TLS area in order to pass it to 1902ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * the C Library's runtime initializer. 1903ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * 1904ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * The initializer must clear the slot and reset the TLS 1905ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * to point to a different location to ensure that no other 1906ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * shared library constructor can access it. 1907ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner */ 1908d3920b3a996b358e48232f417aa0a1e44a60f155Elliott Hughes __libc_init_tls(args); 19091a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov 19101a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#if TIMING 19111a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov struct timeval t0, t1; 19121a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov gettimeofday(&t0, 0); 19131a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#endif 19141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 191518a206c81d9743481e364384affd43306911283dElliott Hughes // Initialize environment functions, and get to the ELF aux vectors table. 191642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_env_init(args); 1917be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 19188d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // If this is a setuid/setgid program, close the security hole described in 19198d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc 19208d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich if (get_AT_SECURE()) { 19218d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich nullify_closed_stdio(); 19228d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich } 19238d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich 1924d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom debuggerd_init(); 19251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 192618a206c81d9743481e364384affd43306911283dElliott Hughes // Get a few environment variables. 192761a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes const char* LD_DEBUG = linker_env_get("LD_DEBUG"); 192861a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes if (LD_DEBUG != NULL) { 1929650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes gLdDebugVerbosity = atoi(LD_DEBUG); 193018a206c81d9743481e364384affd43306911283dElliott Hughes } 1931be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 193218a206c81d9743481e364384affd43306911283dElliott Hughes // Normally, these are cleaned by linker_env_init, but the test 193318a206c81d9743481e364384affd43306911283dElliott Hughes // doesn't cost us anything. 193418a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpath_env = NULL; 193518a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpreload_env = NULL; 193618a206c81d9743481e364384affd43306911283dElliott Hughes if (!get_AT_SECURE()) { 193718a206c81d9743481e364384affd43306911283dElliott Hughes ldpath_env = linker_env_get("LD_LIBRARY_PATH"); 193818a206c81d9743481e364384affd43306911283dElliott Hughes ldpreload_env = linker_env_get("LD_PRELOAD"); 19391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 19401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1941ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ android linker & debugger ]"); 19421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 194342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo* si = soinfo_alloc(args.argv[0]); 194418a206c81d9743481e364384affd43306911283dElliott Hughes if (si == NULL) { 194518a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 19461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 19471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1948d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* bootstrap the link map, the main exe always needs to be first */ 19491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_EXE; 19503a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(si->link_map_head); 19511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_addr = 0; 195342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes map->l_name = args.argv[0]; 19541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = NULL; 19551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = NULL; 19561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 19581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 19591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1960d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* gdb expects the linker to be in the debug shared object list. 1961d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Without this, gdb has trouble locating the linker's ".text" 1962d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * and ".plt" sections. Gdb could also potentially use this to 1963d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * relocate the offset of our exported 'rtld_db_dlactivity' symbol. 1964d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Don't use soinfo_alloc(), because the linker shouldn't 1965d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * be on the soinfo list. 196606f0e74a2b957db93fed3fdd49fe939ab2fe1595Ben Cheng */ 1967d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom { 1968d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom static soinfo linker_soinfo; 19694eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 19701a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin strlcpy(linker_soinfo.name, "/system/bin/linker64", sizeof(linker_soinfo.name)); 19711a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin#else 1972d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom strlcpy(linker_soinfo.name, "/system/bin/linker", sizeof(linker_soinfo.name)); 19731a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin#endif 1974d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_soinfo.flags = 0; 1975d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_soinfo.base = linker_base; 1976d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 1977d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* 1978d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Set the dynamic field in the link map otherwise gdb will complain with 1979d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * the following: 1980d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * warning: .dynamic section for "/system/bin/linker" is not at the 1981d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * expected address (wrong library or version mismatch?) 1982d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom */ 19830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_base); 1984faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_base + elf_hdr->e_phoff); 1985d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, 1986d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom &linker_soinfo.dynamic, NULL, NULL); 1987d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom insert_soinfo_into_debug_map(&linker_soinfo); 1988d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 19891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 199042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Extract information passed from the kernel. 19910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(args.getauxval(AT_PHDR)); 199242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->phnum = args.getauxval(AT_PHNUM); 199342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->entry = args.getauxval(AT_ENTRY); 19941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19958180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner /* Compute the value of si->base. We can't rely on the fact that 19968180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * the first entry is the PHDR because this will not be true 19978180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * for certain executables (e.g. some in the NDK unit test suite) 19988180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner */ 19998180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner si->base = 0; 2000b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner si->size = phdr_table_get_load_size(si->phdr, si->phnum); 2001bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner si->load_bias = 0; 2002ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (size_t i = 0; i < si->phnum; ++i) { 200342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes if (si->phdr[i].p_type == PT_PHDR) { 20040266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_vaddr; 20050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_offset; 200642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes break; 200742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 20088180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner } 2009d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->dynamic = NULL; 2010ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 1; 20111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20122aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base); 20132aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich if (elf_hdr->e_type != ET_DYN) { 20142aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n"); 20152aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich exit(EXIT_FAILURE); 20162aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich } 20172aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich 20184688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). 20194688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_LIBRARY_PATH(ldpath_env); 20204688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_PRELOAD(ldpreload_env); 20214fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 20225ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel somain = si; 20235ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 2024183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(si, NULL)) { 2025650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer()); 202618a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 20271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2029c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov add_vdso(args); 2030c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2031d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallPreInitConstructors(); 20329181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 2033d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (size_t i = 0; gLdPreloads[i] != NULL; ++i) { 2034d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom gLdPreloads[i]->CallConstructors(); 2035326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng } 2036326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng 2037d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* After the link_image, the si->load_bias is initialized. 2038d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * For so lib, the map->l_addr will be updated in notify_gdb_of_load. 2039d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * We need to update this value for so exe here. So Unwind_Backtrace 2040d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * for some arch like x86 could work correctly within so exe. 20419c3449ecd9d5e9cdb1e995e35e53334a4a288a5eXiaokang Qin */ 2042c5db969aa4a24a76fc0964f2ff89533e832b47a6Chao-Ying Fu map->l_addr = si->load_bias; 2043d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 2044e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 20451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING 2046faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes gettimeofday(&t1, NULL); 2047ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("LINKER TIME: %s: %d microseconds", args.argv[0], (int) ( 20481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - 2049faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec))); 20501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 20511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 2052ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol", args.argv[0], 2053bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocAbsolute], 2054bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocRelative], 2055bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocCopy], 2056bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocSymbol]); 20571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 20581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 20591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project { 20601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 20611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned i; 20621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = 0; 2063d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (n = 0; n < 4096; n++) { 2064d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (bitmask[n]) { 20651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned x = bitmask[n]; 2066e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 2067e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland for (i = 0; i < 32; i++) { 2068e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 2069d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (i = 0; i < 8; i++) { 2070e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 2071d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (x & 1) { 2072d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom count++; 2073d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 20741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project x >>= 1; 20751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2078ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("PAGES MODIFIED: %s: %d (%dKB)", args.argv[0], count, count * 4); 20791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 20811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING || STATS || COUNT_PAGES 20831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fflush(stdout); 20841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 20851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2086c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE("[ Ready to execute '%s' @ %p ]", si->name, reinterpret_cast<void*>(si->entry)); 20871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return si->entry; 20881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2089468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 2090bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner/* Compute the load-bias of an existing executable. This shall only 2091bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * be used to compute the load bias of an executable or shared library 2092bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * that was loaded by the kernel itself. 2093bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * 2094bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Input: 2095bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * elf -> address of ELF header, assumed to be at the start of the file. 2096bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Return: 2097bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * load bias, i.e. add the value of any p_vaddr in the file to get 2098bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * the corresponding address in memory. 2099bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner */ 21000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) { 21010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) offset = elf->e_phoff; 2102faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const ElfW(Phdr)* phdr_table = reinterpret_cast<const ElfW(Phdr)*>(reinterpret_cast<uintptr_t>(elf) + offset); 21030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr_end = phdr_table + elf->e_phnum; 2104fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 21050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (const ElfW(Phdr)* phdr = phdr_table; phdr < phdr_end; phdr++) { 2106fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (phdr->p_type == PT_LOAD) { 21070266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return reinterpret_cast<ElfW(Addr)>(elf) + phdr->p_offset - phdr->p_vaddr; 2108bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner } 2109fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 2110fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return 0; 2111bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner} 2112bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner 2113468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2114468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This is the entry point for the linker, called from begin.S. This 2115468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * method is responsible for fixing the linker's own relocations, and 2116468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * then calling __linker_init_post_relocation(). 2117468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * 2118468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * Because this method is called before the linker has fixed it's own 2119468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * relocations, any attempt to reference an extern variable, extern 2120468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * function, or other GOT reference will generate a segfault. 2121468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 21220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesextern "C" ElfW(Addr) __linker_init(void* raw_args) { 212342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes KernelArgumentBlock args(raw_args); 212442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 21250266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) linker_addr = args.getauxval(AT_BASE); 21260266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr); 2127faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff); 212842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 212942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo linker_so; 213042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes memset(&linker_so, 0, sizeof(soinfo)); 213142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2132b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes strcpy(linker_so.name, "[dynamic linker]"); 213342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.base = linker_addr; 213442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); 213542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); 2136d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_so.dynamic = NULL; 213742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phdr = phdr; 213842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phnum = elf_hdr->e_phnum; 213942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.flags |= FLAG_LINKER; 214042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2141183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(&linker_so, NULL)) { 214242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // It would be nice to print an error message, but if the linker 214342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // can't link itself, there's no guarantee that we'll be able to 2144b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // call write() (because it involves a GOT reference). We may as 2145b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // well try though... 2146b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes const char* msg = "CANNOT LINK EXECUTABLE: "; 2147b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, msg, strlen(msg)); 2148b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); 2149b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, "\n", 1); 2150b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes _exit(EXIT_FAILURE); 215142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 2152468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 215342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // We have successfully fixed our own relocations. It's safe to run 215442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // the main part of the linker now. 21550d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes args.abort_message_ptr = &gAbortMessage; 21560266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) start_address = __linker_init_post_relocation(args, linker_addr); 21575419b9474753d25dff947c7740532f86d130c0beElliott Hughes 215842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes set_soinfo_pool_protection(PROT_READ); 2159d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 216042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Return the address that the calling assembly stub should jump to. 216142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes return start_address; 2162468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich} 2163