linker.cpp revision d597d263bc32422402d4810ce4ec070f0227c2f7
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" 51d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov#include "linker_allocator.h" 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Do NOT use malloc() and friends or pthread_*() code here. 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Don't use printf() either; it's caused mysterious memory 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * corruption in the past. 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The linker runs before we bring up libc and it's easiest 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * to make sure it does not depend on any complex libc features 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * open issues / todo: 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - are we doing everything we should for ARM_COPY relocations? 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - cleaner error reporting 651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * - after linking, set as much stuff as possible to READONLY 661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * and NOEXEC 674688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes */ 681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 69183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo); 700266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf); 711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 72ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// We can't use malloc(3) in the dynamic linker. We use a linked list of anonymous 73ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn// maps, each a single page in size. The pages are broken up into as many struct soinfo 74d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov// objects as will fit. 75d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanovstatic LinkerAllocator<soinfo> gSoInfoAllocator; 76ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 77d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* solist = &libdl_info; 78d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* sonext = &libdl_info; 79d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* somain; /* main process, always the one after libdl_info */ 801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 81a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesstatic const char* const gDefaultLdPaths[] = { 824eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 83011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/vendor/lib64", 84011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes "/system/lib64", 85011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#else 86124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/vendor/lib", 87124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes "/system/lib", 88011bc0ba45a8b7766a205cb21269dbafb32294b6Elliott Hughes#endif 89124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes NULL 90124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes}; 91124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes 92a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_BUFSIZE (LDPATH_MAX*64) 93a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPATH_MAX 8 94a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 95a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_BUFSIZE (LDPRELOAD_MAX*64) 96a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes#define LDPRELOAD_MAX 8 97a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 98124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic char gLdPathsBuffer[LDPATH_BUFSIZE]; 99124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic const char* gLdPaths[LDPATH_MAX + 1]; 100bc3a5c26f1b9cf29da6abfc3e197258ef4c03362David Bartley 101124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic char gLdPreloadsBuffer[LDPRELOAD_BUFSIZE]; 102124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic const char* gLdPreloadNames[LDPRELOAD_MAX + 1]; 1034fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 104d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic soinfo* gLdPreloads[LDPRELOAD_MAX + 1]; 1054fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 106650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes__LIBC_HIDDEN__ int gLdDebugVerbosity; 1071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1080d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes__LIBC_HIDDEN__ abort_msg_t* gAbortMessage = NULL; // For debuggerd. 1090d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes 110bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesenum RelocationKind { 111bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocAbsolute = 0, 112bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocRelative, 113bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocCopy, 114bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocSymbol, 115bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes kRelocMax 116bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 117be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 1181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 119bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstruct linker_stats_t { 120bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes int count[kRelocMax]; 121bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes}; 122bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 123bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic linker_stats_t linker_stats; 124bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes 125bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind kind) { 126bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes ++linker_stats.count[kind]; 127bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 128bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 129bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void count_relocation(RelocationKind) { 130bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes} 1311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 134bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic unsigned bitmask[4096]; 135e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 136e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#define MARK(offset) \ 137e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland do { \ 138e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((((offset) >> 12) >> 5) < 4096) \ 139e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \ 140faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 141e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 142bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(offset) \ 143bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes do { \ 144bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ 145faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes } while (0) 146e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 147bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#else 148bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes#define MARK(x) do {} while (0) 1491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 1501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1514688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// You shouldn't try to call memory-allocating functions in the dynamic linker. 1524688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes// Guard against the most obvious ones. 1538f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes#define DISALLOW_ALLOCATION(return_type, name, ...) \ 1548f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes return_type name __VA_ARGS__ \ 1558f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes { \ 1564688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes const char* msg = "ERROR: " #name " called from the dynamic linker!\n"; \ 1578f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes __libc_format_log(ANDROID_LOG_FATAL, "linker", "%s", msg); \ 1588f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes write(2, msg, strlen(msg)); \ 1598f2a5a0b40fc82126c691d5c30131d908772aab7Elliott Hughes abort(); \ 1604688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 161812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, malloc, (size_t u __unused)); 162812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void, free, (void* u __unused)); 163812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, realloc, (void* u1 __unused, size_t u2 __unused)); 164812fd4263a005b88f3b4222baa910114f938d594Kito ChengDISALLOW_ALLOCATION(void*, calloc, (size_t u1 __unused, size_t u2 __unused)); 1652e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 1660353195f344666256dba474a15c9ba22cf0cccc9Dima Zavinstatic char tmp_err_buf[768]; 1672e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavinstatic char __linker_dl_err_buf[768]; 1682e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 169650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hugheschar* linker_get_error_buffer() { 1705419b9474753d25dff947c7740532f86d130c0beElliott Hughes return &__linker_dl_err_buf[0]; 1712e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin} 1722e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin 173650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughessize_t linker_get_error_buffer_size() { 174650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return sizeof(__linker_dl_err_buf); 175650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes} 176650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes 1771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 1781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This function is an empty stub where GDB locates a breakpoint to get notified 1791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about linker activity. 1801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 1815419b9474753d25dff947c7740532f86d130c0beElliott Hughesextern "C" void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity(); 1821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1833a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic r_debug _r_debug = {1, NULL, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0}; 1843a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic link_map* r_debug_tail = 0; 1851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1863b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughesstatic pthread_mutex_t gDebugMutex = PTHREAD_MUTEX_INITIALIZER; 1871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1883a9c5d66dc8d41272f51482b713717af7049697eElliott Hughesstatic void insert_soinfo_into_debug_map(soinfo* info) { 189bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Copy the necessary fields into the debug structure. 1903a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 191ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov map->l_addr = info->load_bias; 192faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes map->l_name = reinterpret_cast<char*>(info->name); 1933a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes map->l_ld = info->dynamic; 1941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Stick the new library at the end of the list. 1961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * gdb tends to care more about libc than it does 1971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * about leaf libraries, and ordering it this way 1981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * reduces the back-and-forth over the wire. 1991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 2001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (r_debug_tail) { 2011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail->l_next = map; 2021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = r_debug_tail; 2031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 2051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 2061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = 0; 2071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = 0; 2081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 2101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 212bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void remove_soinfo_from_debug_map(soinfo* info) { 2133a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(info->link_map_head); 2145e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 215bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (r_debug_tail == map) { 2165e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev r_debug_tail = map->l_prev; 217bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2185e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 219bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_prev) { 220bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_prev->l_next = map->l_next; 221bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 222bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (map->l_next) { 223bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes map->l_next->l_prev = map->l_prev; 224bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 2255e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2265e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 227bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_load(soinfo* info) { 2281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (info->flags & FLAG_EXE) { 2291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project // GDB already knows about the main executable 2301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 2311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2333b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes ScopedPthreadMutexLocker locker(&gDebugMutex); 2341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2353a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project insert_soinfo_into_debug_map(info); 2391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2403a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project rtld_db_dlactivity(); 2425e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev} 2435e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 244bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughesstatic void notify_gdb_of_unload(soinfo* info) { 2455e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev if (info->flags & FLAG_EXE) { 2465e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev // GDB already knows about the main executable 2475e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev return; 2485e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev } 2495e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2503b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes ScopedPthreadMutexLocker locker(&gDebugMutex); 2515e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2523a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_DELETE; 2535e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2545e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2555e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev remove_soinfo_from_debug_map(info); 2565e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev 2573a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2585e12d7ec70472659623d2e4552a670d8877f2423Iliyan Malchev rtld_db_dlactivity(); 2591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 26118a206c81d9743481e364384affd43306911283dElliott Hughesvoid notify_gdb_of_libraries() { 2623a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_ADD; 2633a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2643a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes _r_debug.r_state = r_debug::RT_CONSISTENT; 2653a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes rtld_db_dlactivity(); 2661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 268ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmbornstatic soinfo* soinfo_alloc(const char* name) { 269ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn if (strlen(name) >= SOINFO_NAME_LEN) { 270ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn DL_ERR("library name \"%s\" too long", name); 271ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return NULL; 272ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn } 273ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn 274d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov soinfo* si = gSoInfoAllocator.alloc(); 2751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 276ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn // Initialize the new element. 277ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn memset(si, 0, sizeof(soinfo)); 278ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn strlcpy(si->name, name, sizeof(si->name)); 279ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext->next = si; 280ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn sonext = si; 2811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 282ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: allocated soinfo @ %p", name, si); 283ba98d9237b0eabc1d8caf2600fd787b988645249Magnus Malmborn return si; 2841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 286faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesstatic void soinfo_free(soinfo* si) { 2874688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (si == NULL) { 2884688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return; 2894688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 2904688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 2911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project soinfo *prev = NULL, *trav; 2921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 293ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("name %s: freeing soinfo @ %p", si->name, si); 2941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 295d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (trav = solist; trav != NULL; trav = trav->next) { 2961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == si) 2971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 2981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev = trav; 2991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (trav == NULL) { 301d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* si was not in solist */ 3024688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("name \"%s\" is not in solist!", si->name); 3031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return; 3041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3051dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 306be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner /* prev will never be NULL, because the first entry in solist is 3071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project always the static libdl_info. 3081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 3091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project prev->next = si->next; 310d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si == sonext) { 311d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom sonext = prev; 312d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 313d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov 314d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.free(si); 3151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 317cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 318cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_path(const char* path, const char* delimiters, 319cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes const char** array, char* buf, size_t buf_size, size_t max_count) { 320cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (path == NULL) { 321cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return; 322cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 323cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 324cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t len = strlcpy(buf, path, buf_size); 325cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 326cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes size_t i = 0; 327cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes char* buf_p = buf; 328cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { 329cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (*array[i] != '\0') { 330cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes ++i; 331cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 332cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 333cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 334cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // Forget the last path if we had to truncate; this occurs if the 2nd to 335cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // last char isn't '\0' (i.e. wasn't originally a delimiter). 336cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { 337cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i - 1] = NULL; 338cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } else { 339cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes array[i] = NULL; 340cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 341cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 342cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 343cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_LIBRARY_PATH(const char* path) { 344cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_path(path, ":", gLdPaths, 345cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes gLdPathsBuffer, sizeof(gLdPathsBuffer), LDPATH_MAX); 346cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 347cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 348cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesstatic void parse_LD_PRELOAD(const char* path) { 349cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // We have historically supported ':' as well as ' ' in LD_PRELOAD. 350cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_path(path, " :", gLdPreloadNames, 351cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes gLdPreloadsBuffer, sizeof(gLdPreloadsBuffer), LDPRELOAD_MAX); 352cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 353cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 3544eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 3554688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* For a given PC, find the .so that it belongs to. 3571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Returns the base address of the .ARM.exidx section 3581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * for that .so, and the number of 8-byte entries 3591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * in that section (via *pcount). 3601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Intended to be called by libc's __gnu_Unwind_Find_exidx(). 3621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3633b297c40794b23d50cb5240f9b03f6ef25fd98dbElliott Hughes * This function is exposed via dlfcn.cpp and libdl.so. 3641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 365faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { 3661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned addr = (unsigned)pc; 3671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 368faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes for (soinfo* si = solist; si != 0; si = si->next) { 369468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich if ((addr >= si->base) && (addr < (si->base + si->size))) { 370468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich *pcount = si->ARM_exidx_count; 371f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee return (_Unwind_Ptr)si->ARM_exidx; 3721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 374faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes *pcount = 0; 3751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 3761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3774688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 37824053a461e7a20f34002262c1bb122023134989dChristopher Ferris#endif 3794688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Here, we only have to provide a callback to iterate across all the 3811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * loaded libraries. gcc_eh does the rest. */ 382faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesint dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) { 3831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int rv = 0; 384bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 385bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes dl_phdr_info dl_info; 3863a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_addr = si->link_map_head.l_addr; 3873a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes dl_info.dlpi_name = si->link_map_head.l_name; 3881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phdr = si->phdr; 3891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project dl_info.dlpi_phnum = si->phnum; 390bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes rv = cb(&dl_info, sizeof(dl_phdr_info), data); 391bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes if (rv != 0) { 3921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 393bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes } 3941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 3951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return rv; 3961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 3974688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes 3980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) { 3990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 4000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const char* strtab = si->strtab; 4011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", 4030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); 4041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { 4060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = symtab + n; 4070266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (strcmp(strtab + s->st_name, name)) continue; 4081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4090266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes /* only concern ourselves with global and weak symbol definitions */ 4100266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes switch (ELF_ST_BIND(s->st_info)) { 4110266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_GLOBAL: 4120266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes case STB_WEAK: 4130266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (s->st_shndx == SHN_UNDEF) { 4140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes continue; 4150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4170266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", 4180266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes name, si->name, reinterpret_cast<void*>(s->st_value), 4190266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<size_t>(s->st_size)); 4200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return s; 4211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 4231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return NULL; 4251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 427d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstromstatic unsigned elfhash(const char* _name) { 428faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const unsigned char* name = reinterpret_cast<const unsigned char*>(_name); 4291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned h = 0, g; 4301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 431faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes while (*name) { 4321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h = (h << 4) + *name++; 4331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project g = h & 0xf0000000; 4341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g; 4351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project h ^= g >> 24; 4361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 4371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return h; 4381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 4391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 4400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, soinfo* needed[]) { 441943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan unsigned elf_hash = elfhash(name); 4420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 4436ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 444c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si != NULL && somain != NULL) { 4455ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel /* 446c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Local scope is executable scope. Just start looking into it right away 447c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * for the shortcut. 4485ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel */ 4495ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 450c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si == somain) { 451c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 4525ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 453c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 4545ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel goto done; 4555ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 456c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } else { 457c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ 458c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 459c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 460c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with symbolic relocations disabled, the 461c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * first place to look to resolve external references is the main 462c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * executable. 463c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 464c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 465c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (!si->has_DT_SYMBOLIC) { 466ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s", 46761a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 468c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 469c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 470c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 471c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 472c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 473c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 4745ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 475c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* Look for symbols in the local scope (the object who is 4764eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes * searching). This happens with C++ templates on x86 for some 477c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * reason. 478c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * 479c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Notes on weak symbols: 480c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * The ELF specs are ambiguous about treatment of weak definitions in 481c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * dynamic linking. Some systems return the first definition found 482c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * and some the first non-weak definition. This is system dependent. 483c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * Here we return the first definition found for simplicity. */ 484c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 485c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(si, elf_hash, name); 486c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 487c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = si; 488c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 489c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 490c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 491c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin /* 492c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * If this object was built with -Bsymbolic and symbol is not found 493c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin * in the local scope, try to find the symbol in the main executable. 494c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin */ 495c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin 496c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (si->has_DT_SYMBOLIC) { 497ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in executable %s after local scope", 49861a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, somain->name); 499c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin s = soinfo_elf_lookup(somain, elf_hash, name); 500c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin if (s != NULL) { 501c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin *lsi = somain; 502c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin goto done; 503c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 504c77c434149959e135ba21d1dd8a78a408fef2489Pavel Chupin } 5055ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 506d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 5076ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5084fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer /* Next, look for it in the preloads list */ 509d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; gLdPreloads[i] != NULL; i++) { 510d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom s = soinfo_elf_lookup(gLdPreloads[i], elf_hash, name); 511d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 512d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom *lsi = gLdPreloads[i]; 5134fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer goto done; 5145ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5154fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 5164fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 517d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (int i = 0; needed[i] != NULL; i++) { 518ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s: looking up %s in %s", 51961a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes si->name, name, needed[i]->name); 5205ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_elf_lookup(needed[i], elf_hash, name); 5215ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s != NULL) { 5225ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel *lsi = needed[i]; 52312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel goto done; 5245ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 5256ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5266ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 5276ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchevdone: 528d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s != NULL) { 529c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " 530c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes "found in %s, base = %p, load bias = %p", 531c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes si->name, name, reinterpret_cast<void*>(s->st_value), 532c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), 533c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>((*lsi)->load_bias)); 5346ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev return s; 5356ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev } 5366ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 537943043583a8f3a8de34970b550a3e8e8a6fb0fb8Doug Kwan return NULL; 5386ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev} 5396ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev 540d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3). It performs symbol lookup only within the 5416ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev specified soinfo object and not in any of its dependencies. 542d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 543d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom TODO: Only looking in the specified soinfo seems wrong. dlsym(3) says 544d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom that it should do a breadth first search through the dependency 545d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom tree. This agrees with the ELF spec (aka System V Application 546d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Binary Interface) where in Chapter 5 it discuss resolving "Shared 547d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom Object Dependencies" in breadth first search order. 5486ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 5490266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dlsym_handle_lookup(soinfo* si, const char* name) { 55016084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner return soinfo_elf_lookup(si, elfhash(name), name); 5511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 5521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 553d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom/* This is used by dlsym(3) to performs a global symbol lookup. If the 554d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom start value is null (for RTLD_DEFAULT), the search starts at the 555d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom beginning of the global solist. Otherwise the search starts at the 556d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom specified soinfo (for RTLD_NEXT). 5576ed80c8814db9eed1fb687be22322e38dc46a2fbIliyan Malchev */ 5580266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start) { 559cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes unsigned elf_hash = elfhash(name); 5601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 561cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (start == NULL) { 562cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes start = solist; 563cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 5641698d9ebfc7e27271852a1fdf305a2ac37b3ebe4Matt Fischer 5650266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s = NULL; 566cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { 567cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes s = soinfo_elf_lookup(si, elf_hash, name); 568cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 569cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes *found = si; 570cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes break; 5711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 572cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 5731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 574cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (s != NULL) { 575c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", 576c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); 577cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 5781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 579cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return s; 5801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 5811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 582fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Chengsoinfo* find_containing_library(const void* p) { 5830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) address = reinterpret_cast<ElfW(Addr)>(p); 584fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (soinfo* si = solist; si != NULL; si = si->next) { 585fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (address >= si->base && address - si->base < si->size) { 586fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return si; 587e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 588fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 589fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 590e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 591e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 5920266ae5f884d72da58f33a072e865ba131234a5eElliott HughesElfW(Sym)* dladdr_find_symbol(soinfo* si, const void* addr) { 5930266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) soaddr = reinterpret_cast<ElfW(Addr)>(addr) - si->base; 594fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 595fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // Search the library's symbol table for any defined symbol which 596fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng // contains this address. 597fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng for (size_t i = 0; i < si->nchain; ++i) { 5980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = &si->symtab[i]; 599fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (sym->st_shndx != SHN_UNDEF && 600fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr >= sym->st_value && 601fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng soaddr < sym->st_value + sym->st_size) { 602fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return sym; 603e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer } 604fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 605e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 606fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return NULL; 607e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer} 608e2a8b1fd19fb3a8ead2ba28ddba27be19fa978b5Matt Fischer 609124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library_on_path(const char* name, const char* const paths[]) { 610124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes char buf[512]; 611124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes for (size_t i = 0; paths[i] != NULL; ++i) { 6121e980b6bc8315d00a07312b25486531247abd98cElliott Hughes int n = __libc_format_buffer(buf, sizeof(buf), "%s/%s", paths[i], name); 613124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (n < 0 || n >= static_cast<int>(sizeof(buf))) { 614ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); 615124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes continue; 6161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 617124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); 618124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd != -1) { 619124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 620124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 621124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 622124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return -1; 6231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 625124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughesstatic int open_library(const char* name) { 626ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ opening %s ]", name); 6271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 628124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // If the name contains a slash, we should attempt to open it directly and not search the paths. 629124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (strchr(name, '/') != NULL) { 6306971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); 6316971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes if (fd != -1) { 6326971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes return fd; 6336971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes } 6346971fe4ca52ebdaa85ba676a044412b01d2ef1bfElliott Hughes // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. 6355ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#if defined(__LP64__) 6365ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov return -1; 6375ca7ed9005ea16733d7c87d7154473b7a500be0cDmitriy Ivanov#endif 638124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 6391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 640124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. 641124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes int fd = open_library_on_path(name, gLdPaths); 642124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (fd == -1) { 643a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes fd = open_library_on_path(name, gDefaultLdPaths); 644124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 645124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return fd; 6461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 64812bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles)static soinfo* load_library(const char* name, const android_dlextinfo* extinfo) { 6494688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Open the file. 650650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes int fd = open_library(name); 651650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (fd == -1) { 6524688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("library \"%s\" not found", name); 6531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return NULL; 6542e85579c34047c305caf15fb0ebe02bf3d001d0eDima Zavin } 6551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 656650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes // Read the ELF header and load the segments. 657650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes ElfReader elf_reader(name, fd); 65812bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) if (!elf_reader.Load(extinfo)) { 6594688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 66023363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 66123363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner 662650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes const char* bname = strrchr(name, '/'); 663650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes soinfo* si = soinfo_alloc(bname ? bname + 1 : name); 664650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes if (si == NULL) { 6654688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes return NULL; 66623363ed7503c25ef4024ce0d517f7415c096645dDavid 'Digit' Turner } 667650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->base = elf_reader.load_start(); 668650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->size = elf_reader.load_size(); 669650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->load_bias = elf_reader.load_bias(); 670650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->flags = 0; 671650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->entry = 0; 672650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->dynamic = NULL; 673650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phnum = elf_reader.phdr_count(); 674650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes si->phdr = elf_reader.loaded_phdr(); 675650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes return si; 6761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 6771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 678faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughesstatic soinfo *find_loaded_library(const char* name) { 67912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel // TODO: don't use basename only for determining libraries 68012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel // http://code.google.com/p/android/issues/detail?id=6670 68112c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 682faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* bname = strrchr(name, '/'); 68312c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel bname = bname ? bname + 1 : name; 68412c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 685faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes for (soinfo* si = solist; si != NULL; si = si->next) { 686d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (!strcmp(bname, si->name)) { 68712c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel return si; 68812c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 68912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel } 69012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel return NULL; 69112c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel} 69212c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 69312bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles)static soinfo* find_library_internal(const char* name, const android_dlextinfo* extinfo) { 694d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (name == NULL) { 695d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return somain; 696d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 697d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 698d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes soinfo* si = find_loaded_library(name); 699d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 700d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_LINKED) { 701d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 702d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 703d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes DL_ERR("OOPS: recursive link to \"%s\"", si->name); 704d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return NULL; 705d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 70612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 707ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ '%s' has not been loaded yet. Locating...]", name); 70812bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) si = load_library(name, extinfo); 709cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (si == NULL) { 710cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return NULL; 711cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 712cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 713cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // At this point we know that whatever is loaded @ base is a valid ELF 714cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes // shared library whose segments are properly mapped in. 7155ceb889ac9a36e74e4e00c34c57cbb58d73e228cWeiwu Chen TRACE("[ find_library_internal base=%p size=%zu name='%s' ]", 716c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->size, si->name); 717cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 718183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(si, extinfo)) { 719cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes munmap(reinterpret_cast<void*>(si->base), si->size); 720cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes soinfo_free(si); 721cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes return NULL; 722d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 7236774809b6249d9d4efd982b6e3ca377c84482d9aDavid 'Digit' Turner 724d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 725d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 726d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 72712bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles)static soinfo* find_library(const char* name, const android_dlextinfo* extinfo) { 72812bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* si = find_library_internal(name, extinfo); 729d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 730ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count++; 731d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 732d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 733d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 734d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 735d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesstatic int soinfo_unload(soinfo* si) { 736ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (si->ref_count == 1) { 737ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("unloading '%s'", si->name); 738d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallDestructors(); 739d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 7400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 741d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 742d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 7438147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("%s needs to unload %s", si->name, library_name); 7448147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes soinfo_unload(find_loaded_library(library_name)); 745d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 7461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 7471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 748d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes munmap(reinterpret_cast<void*>(si->base), si->size); 749d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes notify_gdb_of_unload(si); 750ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 0; 751d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov soinfo_free(si); 752d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } else { 753ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count--; 754c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("not unloading '%s', decrementing ref_count to %zd", si->name, si->ref_count); 755d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 756d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return 0; 7571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 759a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughesvoid do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { 760a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes snprintf(buffer, buffer_size, "%s:%s", gDefaultLdPaths[0], gDefaultLdPaths[1]); 761a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes} 762a4aafd156068ee174012f28cd894dbecf0e4ab90Elliott Hughes 763cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughesvoid do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { 764cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes if (!get_AT_SECURE()) { 765cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes parse_LD_LIBRARY_PATH(ld_library_path); 766cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes } 767cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes} 768cade4c36e7c9c62db3f476a0f9cfc329bac9acb7Elliott Hughes 769012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles)soinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) { 770e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL)) != 0) { 771e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes DL_ERR("invalid flags to dlopen: %x", flags); 772e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes return NULL; 773e66190d2a97a713ae4b4786e60ca3d67ab8aa192Elliott Hughes } 774012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) { 775012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) DL_ERR("invalid extended flags to android_dlopen_ext: %x", extinfo->flags); 776012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) return NULL; 777012cb4583a5f8564059142bb1900ea3a31e7cfa9Torne (Richard Coles) } 778d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.protect_all(PROT_READ | PROT_WRITE); 77912bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* si = find_library(name, extinfo); 780d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si != NULL) { 781d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 782d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 783d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.protect_all(PROT_READ); 784d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return si; 785d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 7861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 787d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesint do_dlclose(soinfo* si) { 788d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.protect_all(PROT_READ | PROT_WRITE); 789d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes int result = soinfo_unload(si); 790d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.protect_all(PROT_READ); 791d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return result; 7921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 7931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 7944eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 7959918665a45095ad135576f005c0e5307feb366a1Chris Dearmanstatic int soinfo_relocate(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) { 7960266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 797c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes soinfo* lsi; 798c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 799c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rela) { 8000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rela->r_info); 8010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rela->r_info); 8020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rela->r_offset + si->load_bias); 8030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 804faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 805c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 806c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 807c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (type == 0) { // R_*_NONE 808c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes continue; 809c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 810c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym != 0) { 811c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 812c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = soinfo_do_lookup(si, sym_name, &lsi, needed); 813c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (s == NULL) { 814c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We only allow an undefined symbol if this is a weak reference... 815c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 816c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 817c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 818c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 819c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 820c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 821c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes /* IHI0044C AAELF 4.5.1.1: 822c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 823c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes Libraries are not searched to resolve weak references. 824c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes It is not an error for a weak reference to remain unsatisfied. 825c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 826c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes During linking, the value of an undefined weak reference is: 827c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - Zero if the relocation type is absolute 828c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of the place if the relocation is pc-relative 829c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes - The address of nominal base address if the relocation 830c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes type is base-relative. 831c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes */ 832c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 833c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 834e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 835e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 836e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 837e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 838e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 839e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 840e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 841e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 842e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * The sym_addr was initialized to be zero above, or the relocation 843e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * code below does not care about value of sym_addr. 844e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * No need to do anything. 845e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 846e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 847e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 848c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 849c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 850c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 851c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 852c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // No need to do anything. 853c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 854c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 855c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes sym_addr = reloc; 856c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 8574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 858c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 859faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rela, idx); 860c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 861c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 862c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 863c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes // We got a definition. 8640266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 865c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 866c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocSymbol); 867c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } else { 868c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes s = NULL; 869c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 870c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes 871c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 872e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__aarch64__) 873e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_JUMP_SLOT: 874e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 875e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 8760266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %16llx <- %16llx %s\n", 8770266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 8780266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 879e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 880e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_GLOB_DAT: 881e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 882e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 8830266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %16llx <- %16llx %s\n", 8840266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 8850266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); 886e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 887e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS64: 888e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 889e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 8900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS64 %16llx <- %16llx %s\n", 8910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 8920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 893e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 894e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS32: 895e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 896e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 8970266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS32 %16llx <- %16llx %s\n", 8980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 8990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 9000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 9010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 902e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9030266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9040266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 9050266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 9060266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 907e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 908e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 909e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 910e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_ABS16: 911e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocAbsolute); 912e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9130266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO ABS16 %16llx <- %16llx %s\n", 9140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), sym_name); 9150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && 9160266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 9170266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); 918e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9190266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), 9210266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 9220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 923e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 924e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 925e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 926e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL64: 927e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 928e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9290266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL64 %16llx <- %16llx - %16llx %s\n", 9300266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 9310266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend) - rela->r_offset; 932e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 933e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL32: 934e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 935e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9360266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %16llx <- %16llx - %16llx %s\n", 9370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 9380266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 9390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { 9400266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 941e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9420266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9430266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 9440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT32_MIN), 9450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT32_MAX)); 946e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 947e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 948e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 949e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_PREL16: 950e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 951e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9520266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO REL16 %16llx <- %16llx - %16llx %s\n", 9530266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); 9540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && 9550266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { 9560266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); 957e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 9580266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", 9590266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), 9600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(INT16_MIN), 9610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes static_cast<ElfW(Addr)>(UINT16_MAX)); 962e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 963e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 964e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 965e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 966e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_RELATIVE: 967e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocRelative); 968e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 969e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (sym) { 970e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("odd RELATIVE form..."); 971e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 972e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 9730266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %16llx <- %16llx\n", 9740266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (si->base + rela->r_addend)); 9750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = (si->base + rela->r_addend); 976e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 977e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 978e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_COPY: 979e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if ((si->flags & FLAG_EXE) == 0) { 980e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland /* 981e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 982e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * 983e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * Section 4.7.1.10 "Dynamic relocations" 984e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * R_AARCH64_COPY may only appear in executable objects where e_type is 985e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * set to ET_EXEC. 986e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * 987e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * FLAG_EXE is set for both ET_DYN and ET_EXEC executables. 988e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * We should explicitly disallow ET_DYN executables from having 989e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland * R_AARCH64_COPY relocations. 990e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland */ 991e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s R_AARCH64_COPY relocations only supported for ET_EXEC", si->name); 992e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 993e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 994e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland count_relocation(kRelocCopy); 995e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland MARK(rela->r_offset); 9960266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO COPY %16llx <- %lld @ %16llx %s\n", 9970266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, 9980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes s->st_size, 9990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes (sym_addr + rela->r_addend), 10000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_name); 1001e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (reloc == (sym_addr + rela->r_addend)) { 10020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); 1003e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1004e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (src == NULL) { 1005e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s R_AARCH64_COPY relocation source cannot be resolved", si->name); 1006e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1007e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1008e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (lsi->has_DT_SYMBOLIC) { 1009e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s invalid R_AARCH64_COPY relocation against DT_SYMBOLIC shared " 10100266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes "library %s (built with -Bsymbolic?)", si->name, lsi->name); 1011e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1012e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1013e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland if (s->st_size < src->st_size) { 10140266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes DL_ERR("%s R_AARCH64_COPY relocation size mismatch (%lld < %lld)", 10150266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->name, s->st_size, src->st_size); 1016e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1017e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1018faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes memcpy(reinterpret_cast<void*>(reloc), 1019faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes reinterpret_cast<void*>(src->st_value + lsi->load_bias), src->st_size); 1020e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } else { 1021e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland DL_ERR("%s R_AARCH64_COPY relocation target cannot be resolved", si->name); 1022e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland return -1; 1023e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland } 1024e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1025e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_TPREL64: 10260266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16llx <- %16llx - %16llx\n", 10270266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1028e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1029e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland case R_AARCH64_TLS_DTPREL32: 10300266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16llx <- %16llx - %16llx\n", 10310266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes reloc, (sym_addr + rela->r_addend), rela->r_offset); 1032e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland break; 1033e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#elif defined(__x86_64__) 1034c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_JUMP_SLOT: 1035c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1036c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1037c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1038c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 10390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1040c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1041c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_GLOB_DAT: 1042c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocAbsolute); 1043c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1044c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), 1045c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr + rela->r_addend), sym_name); 10460266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1047c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1048c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_RELATIVE: 1049c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1050c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1051c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (sym) { 1052c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("odd RELATIVE form..."); 1053c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1054c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1055c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), 1056c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(si->base)); 10570266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = si->base + rela->r_addend; 1058c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1059c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_32: 1060c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1061c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1062c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1063c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), sym_name); 10640266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1065c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1066c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin case R_X86_64_64: 1067c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin count_relocation(kRelocRelative); 1068c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin MARK(rela->r_offset); 1069c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), 1070c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin static_cast<size_t>(sym_addr), sym_name); 10710266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; 1072c075c18537d18ccb6760ba1f5727ce2c0890285aPavel Chupin break; 1073c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_X86_64_PC32: 1074c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes count_relocation(kRelocRelative); 1075c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes MARK(rela->r_offset); 1076c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", 1077c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), 1078c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes static_cast<size_t>(sym_addr), static_cast<size_t>(reloc), sym_name); 10790266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend - reloc; 1080c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 10814eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1082e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland 1083c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes default: 1084faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rela, idx); 1085c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return -1; 1086c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1087c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1088c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return 0; 1089c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes} 10909918665a45095ad135576f005c0e5307feb366a1Chris Dearman 10919918665a45095ad135576f005c0e5307feb366a1Chris Dearman#else // REL, not RELA. 10929918665a45095ad135576f005c0e5307feb366a1Chris Dearman 10930266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic int soinfo_relocate(soinfo* si, ElfW(Rel)* rel, unsigned count, soinfo* needed[]) { 10940266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* s; 1095d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 10961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 10974688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes for (size_t idx = 0; idx < count; ++idx, ++rel) { 10980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned type = ELFW(R_TYPE)(rel->r_info); 10990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes // TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead. 11000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes unsigned sym = ELFW(R_SYM)(rel->r_info); 11010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + si->load_bias); 11020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) sym_addr = 0; 1103faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const char* sym_name = NULL; 11041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1105c620059479c47a78d57086d73726c9adc2f337adElliott Hughes DEBUG("Processing '%s' relocation at index %zd", si->name, idx); 1106d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (type == 0) { // R_*_NONE 1107d7daacb46372132ae3f0121647074936c304b572Raghu Gandham continue; 1108d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1109d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (sym != 0) { 1110c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); 11115ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1112d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (s == NULL) { 11134eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We only allow an undefined symbol if this is a weak reference... 1114c62b8a4d3f73b070099d9aa594a261b5250d6cc9Elliott Hughes s = &si->symtab[sym]; 1115c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 1116e9b6fc6f82276188404a2839e31a2f4c19f6c336Elliott Hughes DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); 1117e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1118e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1119e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1120e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan /* IHI0044C AAELF 4.5.1.1: 1121e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1122e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan Libraries are not searched to resolve weak references. 1123e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan It is not an error for a weak reference to remain 1124e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan unsatisfied. 1125e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1126e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan During linking, the value of an undefined weak reference is: 1127e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - Zero if the relocation type is absolute 1128e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan - The address of the place if the relocation is pc-relative 1129bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes - The address of nominal base address if the relocation 1130e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan type is base-relative. 1131e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan */ 1132e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 1133e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan switch (type) { 11344eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1135e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_JUMP_SLOT: 1136e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_GLOB_DAT: 1137e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_ABS32: 1138e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_RELATIVE: /* Don't care. */ 11394eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 11404eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 11414eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 11424eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 11434eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 1144d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case R_386_JMP_SLOT: 1145e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_GLOB_DAT: 1146e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_32: 1147c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case R_386_RELATIVE: /* Don't care. */ 11484eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // sym_addr was initialized to be zero above or relocation 11494eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // code below does not care about value of sym_addr. 11504eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // No need to do anything. 1151e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 1152e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_386_PC32: 1153e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan sym_addr = reloc; 1154e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan break; 11554eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1156e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan 11574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 1158e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan case R_ARM_COPY: 11594eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // Fall through. Can't really copy if weak symbol is not found at run-time. 11604eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1161e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan default: 1162faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rel, idx); 1163e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan return -1; 1164e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } 1165e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan } else { 11664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes // We got a definition. 11670266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); 1168d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1169bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocSymbol); 11701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 1171e823807dc2fb5f2d44cd00d75c10ddd9f5e93beaDoug Kwan s = NULL; 11721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 11731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1174c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (type) { 11754eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 11761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_JUMP_SLOT: 1177bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 11781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1179ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 11800266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 11811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 11821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_GLOB_DAT: 1183bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 11841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1185ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 11860266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 11871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 11881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_ABS32: 1189bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocAbsolute); 11901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1191ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO ABS %08x <- %08x %s", reloc, sym_addr, sym_name); 11920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 11931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 119434ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner case R_ARM_REL32: 1195bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocRelative); 119634ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner MARK(rel->r_offset); 1197ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", 119834ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner reloc, sym_addr, rel->r_offset, sym_name); 11990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr - rel->r_offset; 120034ea5117dbeba41ae5dfdfb2c2ec8cae23388b66David 'Digit' Turner break; 12011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case R_ARM_COPY: 1202d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich if ((si->flags & FLAG_EXE) == 0) { 1203d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* 1204d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf 1205d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * 1206d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * Section 4.7.1.10 "Dynamic relocations" 1207d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * R_ARM_COPY may only appear in executable objects where e_type is 1208d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * set to ET_EXEC. 1209d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * 1210d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * TODO: FLAG_EXE is set for both ET_DYN and ET_EXEC executables. 1211d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * We should explicitly disallow ET_DYN executables from having 1212d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich * R_ARM_COPY relocations. 1213d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich */ 1214d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich DL_ERR("%s R_ARM_COPY relocations only supported for ET_EXEC", si->name); 1215d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich return -1; 1216d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 1217bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes count_relocation(kRelocCopy); 12181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project MARK(rel->r_offset); 1219ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE_TYPE(RELO, "RELO %08x <- %d @ %08x %s", reloc, s->st_size, sym_addr, sym_name); 1220d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich if (reloc == sym_addr) { 12210266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); 12225ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 12235ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (src == NULL) { 12245ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s R_ARM_COPY relocation source cannot be resolved", si->name); 12255ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel return -1; 12265ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 12275ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (lsi->has_DT_SYMBOLIC) { 12285ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s invalid R_ARM_COPY relocation against DT_SYMBOLIC shared " 12295ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel "library %s (built with -Bsymbolic?)", si->name, lsi->name); 12305ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel return -1; 12315ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 12325ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel if (s->st_size < src->st_size) { 12335ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s R_ARM_COPY relocation size mismatch (%d < %d)", 12345ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->name, s->st_size, src->st_size); 12355ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel return -1; 12365ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 1237faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes memcpy(reinterpret_cast<void*>(reloc), 1238faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes reinterpret_cast<void*>(src->st_value + lsi->load_bias), src->st_size); 12395ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } else { 12405ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel DL_ERR("%s R_ARM_COPY relocation target cannot be resolved", si->name); 1241d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich return -1; 1242d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich } 12431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 12444eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 12454eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_JMP_SLOT: 12464eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12474eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12484eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); 12490266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12504eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12514eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_GLOB_DAT: 12524eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12534eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12544eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); 12550266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; 12564eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12574eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_32: 12584eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 12594eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12604eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_32 %08x <- +%08x %s", reloc, sym_addr, sym_name); 12610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12624eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12634eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_PC32: 12644eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 12654eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12664eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", 12674eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); 12680266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr - reloc); 12694eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12704eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__mips__) 12714eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_MIPS_REL32: 12729918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__LP64__) 12739918665a45095ad135576f005c0e5307feb366a1Chris Dearman // MIPS Elf64_Rel entries contain compound relocations 12749918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case 12759918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || 12769918665a45095ad135576f005c0e5307feb366a1Chris Dearman ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { 1277faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)", 12789918665a45095ad135576f005c0e5307feb366a1Chris Dearman type, (unsigned)ELF64_R_TYPE2(rel->r_info), 1279faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (unsigned)ELF64_R_TYPE3(rel->r_info), rel, idx); 12809918665a45095ad135576f005c0e5307feb366a1Chris Dearman return -1; 12819918665a45095ad135576f005c0e5307feb366a1Chris Dearman } 12829918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 12834eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocAbsolute); 12844eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 12859918665a45095ad135576f005c0e5307feb366a1Chris Dearman TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), 12869918665a45095ad135576f005c0e5307feb366a1Chris Dearman static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); 12874eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (s) { 12880266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; 12894eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } else { 12900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 12914eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 12924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 12934eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 12944eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes 12954eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 12964eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_ARM_RELATIVE: 12974eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#elif defined(__i386__) 12984eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes case R_386_RELATIVE: 12994eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 13004eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes count_relocation(kRelocRelative); 13014eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes MARK(rel->r_offset); 13024eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes if (sym) { 13034eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DL_ERR("odd RELATIVE form..."); 13044eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes return -1; 13054eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes } 13064eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", 13074eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); 13080266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; 13094eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes break; 13101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project default: 1312faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx); 13131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 13141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 13161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return 0; 13171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 1318c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 13191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 13204eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 132187c358524e479235aa6241736d2ce325f89daafcBrian Carlstromstatic bool mips_relocate_got(soinfo* si, soinfo* needed[]) { 13229918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Addr)** got = si->plt_got; 132387c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (got == NULL) { 132487c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 132587c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom } 132687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned local_gotno = si->mips_local_gotno; 132787c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned gotsym = si->mips_gotsym; 132887c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom unsigned symtabno = si->mips_symtabno; 13290266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* symtab = si->symtab; 1330d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 13319918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[0] is the address of the lazy resolver function. 13329918665a45095ad135576f005c0e5307feb366a1Chris Dearman // got[1] may be used for a GNU extension. 13339918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start). 13349918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: maybe this should be in a separate routine? 1335d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if ((si->flags & FLAG_LINKER) == 0) { 133687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom size_t g = 0; 13379918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef); 13389918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (reinterpret_cast<intptr_t>(got[g]) < 0) { 13399918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed); 1340d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 13419918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Relocate the local GOT entries. 1342d7daacb46372132ae3f0121647074936c304b572Raghu Gandham for (; g < local_gotno; g++) { 13439918665a45095ad135576f005c0e5307feb366a1Chris Dearman got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + si->load_bias); 1344d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1345d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1346d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 13479918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Now for the global GOT entries... 13480266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Sym)* sym = symtab + gotsym; 1349d7daacb46372132ae3f0121647074936c304b572Raghu Gandham got = si->plt_got + local_gotno; 135087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { 13519918665a45095ad135576f005c0e5307feb366a1Chris Dearman // This is an undefined reference... try to locate it. 13529918665a45095ad135576f005c0e5307feb366a1Chris Dearman const char* sym_name = si->strtab + sym->st_name; 1353d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo* lsi; 13549918665a45095ad135576f005c0e5307feb366a1Chris Dearman ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed); 1355d7daacb46372132ae3f0121647074936c304b572Raghu Gandham if (s == NULL) { 13569918665a45095ad135576f005c0e5307feb366a1Chris Dearman // We only allow an undefined symbol if this is a weak reference. 1357d7daacb46372132ae3f0121647074936c304b572Raghu Gandham s = &symtab[g]; 1358c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (ELF_ST_BIND(s->st_info) != STB_WEAK) { 13594688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot locate \"%s\"...", sym_name); 136087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return false; 1361d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1362d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *got = 0; 13639918665a45095ad135576f005c0e5307feb366a1Chris Dearman } else { 13649918665a45095ad135576f005c0e5307feb366a1Chris Dearman // FIXME: is this sufficient? 13659918665a45095ad135576f005c0e5307feb366a1Chris Dearman // For reference see NetBSD link loader 13669918665a45095ad135576f005c0e5307feb366a1Chris 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 13679918665a45095ad135576f005c0e5307feb366a1Chris Dearman *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value); 1368d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1369d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 137087c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom return true; 1371d7daacb46372132ae3f0121647074936c304b572Raghu Gandham} 1372d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1373d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1374812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallArray(const char* array_name __unused, linker_function_t* functions, size_t count, bool reverse) { 1375ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes if (functions == NULL) { 1376d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1377d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 13788215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1379c620059479c47a78d57086d73726c9adc2f337adElliott Hughes TRACE("[ Calling %s (size %zd) @ %p for '%s' ]", array_name, count, functions, name); 13808215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1381ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int begin = reverse ? (count - 1) : 0; 1382ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int end = reverse ? -1 : count; 1383ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes int step = reverse ? -1 : 1; 13848215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1385ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (int i = begin; i != end; i += step) { 1386ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); 1387ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes CallFunction("function", functions[i]); 1388d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1389d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1390ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s for '%s' ]", array_name, name); 13911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 13921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1393812fd4263a005b88f3b4222baa910114f938d594Kito Chengvoid soinfo::CallFunction(const char* function_name __unused, linker_function_t function) { 1394db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) { 1395d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1396d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1397d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 1398ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); 1399d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes function(); 1400ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); 1401db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes 1402db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures 1403db492b3ca753c4ef688d0daf648294de0c89145eElliott Hughes // are still writable. This happens with our debug malloc (see http://b/7941716). 1404d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.protect_all(PROT_READ | PROT_WRITE); 14059181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov} 14069181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 1407d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallPreInitConstructors() { 14088147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_PREINIT_ARRAY functions are called before any other constructors for executables, 14098147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // but ignored in a shared library. 1410d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); 1411d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes} 1412e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1413d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallConstructors() { 1414d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (constructors_called) { 1415d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes return; 1416d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 1417e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 1418d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // We set constructors_called before actually calling the constructors, otherwise it doesn't 1419d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // protect against recursive constructor calls. One simple example of constructor recursion 1420d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: 1421d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 1. The program depends on libc, so libc's constructor is called here. 1422d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. 1423d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 3. dlopen() calls the constructors on the newly created 1424d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // soinfo for libc_malloc_debug_leak.so. 1425d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // 4. The debug .so depends on libc, so CallConstructors is 1426d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // called again with the libc soinfo. If it doesn't trigger the early- 1427d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes // out above, the libc constructor will be called again (recursively!). 1428d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes constructors_called = true; 1429d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 14308147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { 14318147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // The GNU dynamic linker silently ignores these, but we warn the developer. 1432c620059479c47a78d57086d73726c9adc2f337adElliott Hughes PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", 14338147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes name, preinit_array_count); 1434d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1436d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (dynamic != NULL) { 14370266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = dynamic; d->d_tag != DT_NULL; ++d) { 1438d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1439d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = strtab + d->d_un.d_val; 14408147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors in DT_NEEDED \"%s\"", name, library_name); 14418147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes find_loaded_library(library_name)->CallConstructors(); 1442d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1444d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes } 14451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14468147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling constructors", name); 14478147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14488147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_INIT should be called before DT_INIT_ARRAY if both are present. 1449d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_INIT", init_func); 1450d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); 1451e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov} 14528215679b355efe3829bab571bd566dc818ea4cccDavid 'Digit' Turner 1453d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughesvoid soinfo::CallDestructors() { 14548147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes TRACE("\"%s\": calling destructors", name); 14558147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14568147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI_ARRAY must be parsed in reverse order. 1457d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); 14588147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes 14598147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // DT_FINI should be called after DT_FINI_ARRAY if both are present. 1460d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes CallFunction("DT_FINI", fini_func); 14611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 14621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* Force any of the closed stdin, stdout and stderr to be associated with 14641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /dev/null. */ 14655419b9474753d25dff947c7740532f86d130c0beElliott Hughesstatic int nullify_closed_stdio() { 14661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int dev_null, i, status; 14671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int return_value = 0; 14681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 146916084168111cd7d2ac8a6b92e6fa6df5696928a5David 'Digit' Turner dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR)); 14701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null < 0) { 14714688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("cannot open /dev/null: %s", strerror(errno)); 14721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return -1; 14731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1474ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); 14751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If any of the stdio file descriptors is valid and not associated 14771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project with /dev/null, dup /dev/null to it. */ 14781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project for (i = 0; i < 3; i++) { 14791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If it is /dev/null already, we are done. */ 14804688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (i == dev_null) { 14811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 14824688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 14831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1484ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Nullifying stdio file descriptor %d]", i); 14854688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); 14861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14874688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes /* If file is opened, we are good. */ 14884688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status != -1) { 14894688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes continue; 14904688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes } 14911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 14921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* The only error we allow is that the file descriptor does not 14931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project exist, in which case we dup /dev/null to it. */ 14941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (errno != EBADF) { 14954688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("fcntl failed: %s", strerror(errno)); 14961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 14971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 14981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 14991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Try dupping /dev/null to this stdio file descriptor and 15011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project repeat if there is a signal. Note that any errors in closing 15021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project the stdio descriptor are lost. */ 15034688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); 15041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (status < 0) { 15054688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("dup2 failed: %s", strerror(errno)); 15061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 15071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project continue; 15081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15091dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* If /dev/null is not one of the stdio file descriptors, close it. */ 15121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (dev_null > 2) { 1513ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); 15144688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes status = TEMP_FAILURE_RETRY(close(dev_null)); 15154688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes if (status == -1) { 15164688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("close failed: %s", strerror(errno)); 15171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return_value = -1; 15181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 15211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return return_value; 15221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 15231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1524183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles)static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo) { 1525f186a1819a4489c8d73485042670a3002742b683Ji-Hwan Lee /* "base" might wrap around UINT32_MAX. */ 15260266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) base = si->load_bias; 15270266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr = si->phdr; 15281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int phnum = si->phnum; 1529d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom bool relocating_linker = (si->flags & FLAG_LINKER) != 0; 15301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1531b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can't debug anything until the linker is relocated */ 1532b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1533ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ linking %s ]", si->name); 1534c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p si->flags = 0x%08x", reinterpret_cast<void*>(si->base), si->flags); 1535b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 15361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 153763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner /* Extract dynamic section */ 1538124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes size_t dynamic_count; 15390266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Word) dynamic_flags; 154012c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, 1541cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman &dynamic_count, &dynamic_flags); 154263f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner if (si->dynamic == NULL) { 1543b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1544124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); 1545b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 1546124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 154763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } else { 1548b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (!relocating_linker) { 1549ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("dynamic = %p", si->dynamic); 1550b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner } 155163f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner } 155263f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 15534eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__arm__) 155463f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner (void) phdr_table_get_arm_exidx(phdr, phnum, base, 155563f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner &si->ARM_exidx, &si->ARM_exidx_count); 155663f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner#endif 155763f99f4a4e05353de2e8ba3d7bd4d882d716167aDavid 'Digit' Turner 15588147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes // Extract useful information from dynamic section. 1559d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom uint32_t needed_count = 0; 15600266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1561c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", 1562c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1563c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes switch (d->d_tag) { 15641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_HASH: 1565faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nbucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[0]; 1566faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->nchain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[1]; 1567faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->bucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8); 1568faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->chain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8 + si->nbucket * 4); 15691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_STRTAB: 1571faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->strtab = reinterpret_cast<const char*>(base + d->d_un.d_ptr); 15721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_SYMTAB: 1574faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->symtab = reinterpret_cast<ElfW(Sym)*>(base + d->d_un.d_ptr); 15751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15764eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if !defined(__LP64__) 15771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTREL: 1578d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val != DT_REL) { 1579124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1580124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 15811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 15821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1583c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 15841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_JMPREL: 15854eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1586faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1587c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1588faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->plt_rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1589c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 15901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTRELSZ: 15924eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 15930266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1594c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 15950266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1596c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 15971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 15989918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if defined(__mips__) 15991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PLTGOT: 16009918665a45095ad135576f005c0e5307feb366a1Chris Dearman // Used by mips and mips64. 16019918665a45095ad135576f005c0e5307feb366a1Chris Dearman si->plt_got = reinterpret_cast<ElfW(Addr)**>(base + d->d_un.d_ptr); 16021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1603c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_DEBUG: 1605bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_DEBUG entry to the address of _r_debug for GDB 1606cf23905a4bcc7bfdd109be5b6d69ad06877aa217Chris Dearman // if the dynamic table is writable 16079918665a45095ad135576f005c0e5307feb366a1Chris Dearman// FIXME: not working currently for N64 16089918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The flags for the LOAD and DYNAMIC program headers do not agree. 16099918665a45095ad135576f005c0e5307feb366a1Chris Dearman// The LOAD section containng the dynamic table has been mapped as 16109918665a45095ad135576f005c0e5307feb366a1Chris Dearman// read-only, but the DYNAMIC header claims it is writable. 16119918665a45095ad135576f005c0e5307feb366a1Chris Dearman#if !(defined(__mips__) && defined(__LP64__)) 161299c32055cb50443f722c55914869c1f6bb941959Elliott Hughes if ((dynamic_flags & PF_W) != 0) { 1613c620059479c47a78d57086d73726c9adc2f337adElliott Hughes d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); 161499c32055cb50443f722c55914869c1f6bb941959Elliott Hughes } 16151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16169918665a45095ad135576f005c0e5307feb366a1Chris Dearman#endif 16174eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1618c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELA: 1619faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); 1620c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1621c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELASZ: 16220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); 1623c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1624c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1625c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_REL in \"%s\"", si->name); 1626c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1627c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 1628c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); 1629c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1630c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1631c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_REL: 1632faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes si->rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); 1633c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1634c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes case DT_RELSZ: 16350266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); 1636c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes break; 1637ad13c57298e57d33c130fb03a2c6494da573408cShin-ichiro KAWASAKI case DT_RELA: 1638124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("unsupported DT_RELA in \"%s\"", si->name); 1639124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1640c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 16411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT: 1642ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 16438147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT) found at %p", si->name, si->init_func); 16441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI: 1646ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); 16478147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI) found at %p", si->name, si->fini_func); 16481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAY: 1650ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->init_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 16518147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_INIT_ARRAY) found at %p", si->name, si->init_array); 16521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_INIT_ARRAYSZ: 16540266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->init_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 16551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAY: 1657ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->fini_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 16588147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s destructors (DT_FINI_ARRAY) found at %p", si->name, si->fini_array); 16591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_FINI_ARRAYSZ: 16610266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->fini_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 16621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAY: 1664ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->preinit_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); 16658147d3c284932896ab6095232b355979b9eb33d3Elliott Hughes DEBUG("%s constructors (DT_PREINIT_ARRAY) found at %p", si->name, si->preinit_array); 16661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_PREINIT_ARRAYSZ: 16680266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); 16691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 16701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project case DT_TEXTREL: 1671e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1672e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1673e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1674e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 16755135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->has_text_relocations = true; 16761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project break; 1677e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 16785ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_SYMBOLIC: 16795ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 16805ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 1681d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom case DT_NEEDED: 1682d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom ++needed_count; 1683d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom break; 16845ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel case DT_FLAGS: 1685d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_TEXTREL) { 1686e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if defined(__LP64__) 1687e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); 1688e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes return false; 1689e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#else 16905ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_text_relocations = true; 1691e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 16925ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 1693d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_un.d_val & DF_SYMBOLIC) { 16945ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel si->has_DT_SYMBOLIC = true; 16955ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel } 16965ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel break; 16974eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 1698d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_STRSZ: 1699d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_SYMENT: 1700d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_RELENT: 1701d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1702d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_MAP: 1703bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes // Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB. 1704d7daacb46372132ae3f0121647074936c304b572Raghu Gandham { 1705006f9ad8910c945cd50e54f6c34d8c27b11c1193Benjamin Adolphi r_debug** dp = reinterpret_cast<r_debug**>(base + d->d_un.d_ptr); 1706d7daacb46372132ae3f0121647074936c304b572Raghu Gandham *dp = &_r_debug; 1707d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1708d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1709d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_RLD_VERSION: 1710d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_FLAGS: 1711d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_BASE_ADDRESS: 1712d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_UNREFEXTNO: 1713d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1714d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1715d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_SYMTABNO: 1716d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_symtabno = d->d_un.d_val; 1717d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1718d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1719d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_LOCAL_GOTNO: 1720d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_local_gotno = d->d_un.d_val; 1721d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 1722d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1723d7daacb46372132ae3f0121647074936c304b572Raghu Gandham case DT_MIPS_GOTSYM: 1724d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->mips_gotsym = d->d_un.d_val; 1725d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 17264eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#endif 1727d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 1728d7daacb46372132ae3f0121647074936c304b572Raghu Gandham default: 17294eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes DEBUG("Unused DT entry: type %p arg %p", 17304eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); 1731d7daacb46372132ae3f0121647074936c304b572Raghu Gandham break; 17321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1735c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", 1736c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes reinterpret_cast<void*>(si->base), si->strtab, si->symtab); 17371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1738124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes // Sanity checks. 1739d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (relocating_linker && needed_count != 0) { 1740d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); 1741d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom return false; 1742d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 1743124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->nbucket == 0) { 1744124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); 1745124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1746124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1747124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->strtab == 0) { 1748124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); 1749124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1750124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 1751124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes if (si->symtab == 0) { 1752124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); 1753124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 17541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 17567e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // If this is the main executable, then load all of the libraries from LD_PRELOAD now. 1757d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (si->flags & FLAG_EXE) { 1758d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom memset(gLdPreloads, 0, sizeof(gLdPreloads)); 17597e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes size_t preload_count = 0; 1760d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes for (size_t i = 0; gLdPreloadNames[i] != NULL; i++) { 176112bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* lsi = find_library(gLdPreloadNames[i], NULL); 17627e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes if (lsi != NULL) { 17637e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes gLdPreloads[preload_count++] = lsi; 17647e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes } else { 17657e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes // As with glibc, failure to load an LD_PRELOAD library is just a warning. 17667e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", 17677e5a8cc5230dcc027686813e51a1b001cee4c602Elliott Hughes gLdPreloadNames[i], si->name, linker_get_error_buffer()); 17684fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 17694fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 17704fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer } 17714fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 1772faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes soinfo** needed = reinterpret_cast<soinfo**>(alloca((1 + needed_count) * sizeof(soinfo*))); 1773d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom soinfo** pneeded = needed; 177412c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel 17750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { 1776d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (d->d_tag == DT_NEEDED) { 1777d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom const char* library_name = si->strtab + d->d_un.d_val; 1778ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("%s needs %s", si->name, library_name); 177912bbb9164578b6512b8b07a3fb093858244b7c7bTorne (Richard Coles) soinfo* lsi = find_library(library_name, NULL); 1780d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes if (lsi == NULL) { 1781650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); 17824688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("could not load library \"%s\" needed by \"%s\"; caused by %s", 1783d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom library_name, si->name, tmp_err_buf); 1784124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 17851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 178612c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded++ = lsi; 17871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 17881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 178912c78bbded8ec03f821dfa09174464c04836e4eaArd Biesheuvel *pneeded = NULL; 17901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1791e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 17925135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1793e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // Make segments writable to allow text relocations to work properly. We will later call 1794e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // phdr_table_protect_segments() after all of them are applied and all constructors are run. 1795865119efd47ae3cae5a0c09c6a9cc184a10614c1Du Chenyang#if !defined(__i386__) // The platform itself has too many text relocations on x86. 17963d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich DL_WARN("%s has text relocations. This is wasting memory and prevents " 17973d4470c14a57b0b9ae74060370be53469e95d6a1Nick Kralevich "security hardening. Please fix.", si->name); 1798865119efd47ae3cae5a0c09c6a9cc184a10614c1Du Chenyang#endif 17995135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 18005135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't unprotect loadable segments for \"%s\": %s", 18015135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1802124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18035135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 18045135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 1805e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18065135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich 18074eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(USE_RELA) 1808c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->plt_rela != NULL) { 1809faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]\n", si->name); 18109918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) { 1811c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1812c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1813c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1814c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes if (si->rela != NULL) { 1815faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]\n", si->name); 18169918665a45095ad135576f005c0e5307feb366a1Chris Dearman if (soinfo_relocate(si, si->rela, si->rela_count, needed)) { 1817c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes return false; 1818c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1819c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes } 1820c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#else 1821d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->plt_rel != NULL) { 1822faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s plt ]", si->name); 1823d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { 1824124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1825124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 18261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1827d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (si->rel != NULL) { 1828faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes DEBUG("[ relocating %s ]", si->name); 1829d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { 1830124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1831124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes } 18321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1833c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes#endif 18341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 18354eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__mips__) 183687c358524e479235aa6241736d2ce325f89daafcBrian Carlstrom if (!mips_relocate_got(si, needed)) { 1837124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 1838d7daacb46372132ae3f0121647074936c304b572Raghu Gandham } 1839d7daacb46372132ae3f0121647074936c304b572Raghu Gandham#endif 1840d7daacb46372132ae3f0121647074936c304b572Raghu Gandham 18411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_LINKED; 1842ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes DEBUG("[ finished linking %s ]", si->name); 18431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1844e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#if !defined(__LP64__) 18455135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (si->has_text_relocations) { 1846e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes // All relocations are done, we can protect our segments back to read-only. 18475135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { 18485135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich DL_ERR("can't protect segments for \"%s\": %s", 18495135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich si->name, strerror(errno)); 1850124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18515135b3ae6ebc460418f7917bd36b368340e48d5aNick Kralevich } 18521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1853e4d792adb8d6f9228b9ac9dc1ad7f43b271f085fElliott Hughes#endif 18541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1855b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner /* We can also turn on GNU RELRO protection */ 1856b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) { 18574688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", 18584688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes si->name, strerror(errno)); 1859124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return false; 18609ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich } 18619ec0f03a0d0b17bbb94ac0b9fef6add28a133c3aNick Kralevich 1862183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) /* Handle serializing/sharing the RELRO segment */ 1863183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (extinfo && (extinfo->flags & ANDROID_DLEXT_WRITE_RELRO)) { 1864183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_serialize_gnu_relro(si->phdr, si->phnum, si->load_bias, 1865183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 1866183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed serializing GNU RELRO section for \"%s\": %s", 1867183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 1868183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 1869183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1870183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } else if (extinfo && (extinfo->flags & ANDROID_DLEXT_USE_RELRO)) { 1871183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (phdr_table_map_gnu_relro(si->phdr, si->phnum, si->load_bias, 1872183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) extinfo->relro_fd) < 0) { 1873183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) DL_ERR("failed mapping GNU RELRO section for \"%s\": %s", 1874183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) si->name, strerror(errno)); 1875183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) return false; 1876183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1877183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) } 1878183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) 18791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project notify_gdb_of_load(si); 1880124fae9eabd7a25d80dfa8c3b56bed0f0fba16f1Elliott Hughes return true; 18811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 18821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1883468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 1884c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * This function add vdso to internal dso list. 1885c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * It helps to stack unwinding through signal handlers. 1886c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov * Also, it makes bionic more like glibc. 1887c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov */ 1888812fd4263a005b88f3b4222baa910114f938d594Kito Chengstatic void add_vdso(KernelArgumentBlock& args __unused) { 18894eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(AT_SYSINFO_EHDR) 18900266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(args.getauxval(AT_SYSINFO_EHDR)); 18910266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes if (ehdr_vdso == NULL) { 18920266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return; 18930266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes } 1894c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 18950266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes soinfo* si = soinfo_alloc("[vdso]"); 1896ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 18970266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); 18980266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phnum = ehdr_vdso->e_phnum; 18990266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(ehdr_vdso); 19000266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->size = phdr_table_get_load_size(si->phdr, si->phnum); 19010266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->flags = 0; 19020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = get_elf_exec_load_bias(ehdr_vdso); 1903ebd506c69e12b6dcaf5be94cc8ed1b53af299f9fSergey Melnikov 19040dcf06f976670b5d05286b184d150f61b71c1184Torne (Richard Coles) soinfo_link_image(si, NULL); 1905c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov#endif 1906c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov} 1907c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 1908c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov/* 1909468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This code is called after the linker has linked itself and 1910468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * fixed it's own GOT. It is safe to make references to externs 1911468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * and other non-local data at this point. 1912468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 19130266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(Addr) linker_base) { 191442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes /* NOTE: we store the args pointer on a special location 1915ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * of the temporary TLS area in order to pass it to 1916ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * the C Library's runtime initializer. 1917ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * 1918ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * The initializer must clear the slot and reset the TLS 1919ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * to point to a different location to ensure that no other 1920ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner * shared library constructor can access it. 1921ef0bd1857041ffde069cf52138aaf22c1af7130eDavid 'Digit' Turner */ 1922d3920b3a996b358e48232f417aa0a1e44a60f155Elliott Hughes __libc_init_tls(args); 19231a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov 19241a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#if TIMING 19251a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov struct timeval t0, t1; 19261a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov gettimeofday(&t0, 0); 19271a78fbb5c8228e4aea2a516818828b76044310f2Evgeniy Stepanov#endif 19281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 192918a206c81d9743481e364384affd43306911283dElliott Hughes // Initialize environment functions, and get to the ELF aux vectors table. 193042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_env_init(args); 1931be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 19328d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // If this is a setuid/setgid program, close the security hole described in 19338d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc 19348d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich if (get_AT_SECURE()) { 19358d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich nullify_closed_stdio(); 19368d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich } 19378d3e91d4f842911366155845afb3cfbdad0b4cadNick Kralevich 1938d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom debuggerd_init(); 19391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 194018a206c81d9743481e364384affd43306911283dElliott Hughes // Get a few environment variables. 194161a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes const char* LD_DEBUG = linker_env_get("LD_DEBUG"); 194261a9ccb41eba8c35cae6e21318aca7160a402c5bElliott Hughes if (LD_DEBUG != NULL) { 1943650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes gLdDebugVerbosity = atoi(LD_DEBUG); 194418a206c81d9743481e364384affd43306911283dElliott Hughes } 1945be5755969d70668bbab0e0c0ed75ebd867189723David 'Digit' Turner 194618a206c81d9743481e364384affd43306911283dElliott Hughes // Normally, these are cleaned by linker_env_init, but the test 194718a206c81d9743481e364384affd43306911283dElliott Hughes // doesn't cost us anything. 194818a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpath_env = NULL; 194918a206c81d9743481e364384affd43306911283dElliott Hughes const char* ldpreload_env = NULL; 195018a206c81d9743481e364384affd43306911283dElliott Hughes if (!get_AT_SECURE()) { 195118a206c81d9743481e364384affd43306911283dElliott Hughes ldpath_env = linker_env_get("LD_LIBRARY_PATH"); 195218a206c81d9743481e364384affd43306911283dElliott Hughes ldpreload_env = linker_env_get("LD_PRELOAD"); 19531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 19541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1955d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov // Linker does not call constructors for its own 1956d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov // global variables so we need to initialize 1957d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov // the allocator explicitly. 1958d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.init(); 1959d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov 1960ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes INFO("[ android linker & debugger ]"); 19611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 196242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo* si = soinfo_alloc(args.argv[0]); 196318a206c81d9743481e364384affd43306911283dElliott Hughes if (si == NULL) { 196418a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 19651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 19661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1967d39c3abd5ad8600fb1d79a0b95a58197197087e0Nick Kralevich /* bootstrap the link map, the main exe always needs to be first */ 19681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project si->flags |= FLAG_EXE; 19693a9c5d66dc8d41272f51482b713717af7049697eElliott Hughes link_map* map = &(si->link_map_head); 19701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_addr = 0; 197242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes map->l_name = args.argv[0]; 19731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_prev = NULL; 19741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project map->l_next = NULL; 19751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 19761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project _r_debug.r_map = map; 19771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project r_debug_tail = map; 19781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1979d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* gdb expects the linker to be in the debug shared object list. 1980d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Without this, gdb has trouble locating the linker's ".text" 1981d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * and ".plt" sections. Gdb could also potentially use this to 1982d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * relocate the offset of our exported 'rtld_db_dlactivity' symbol. 1983d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Don't use soinfo_alloc(), because the linker shouldn't 1984d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * be on the soinfo list. 198506f0e74a2b957db93fed3fdd49fe939ab2fe1595Ben Cheng */ 1986d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom { 1987d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom static soinfo linker_soinfo; 19884eeb1f12a8b63afc0d0ad4d466b16fbffb21cd5aElliott Hughes#if defined(__LP64__) 19891a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin strlcpy(linker_soinfo.name, "/system/bin/linker64", sizeof(linker_soinfo.name)); 19901a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin#else 1991d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom strlcpy(linker_soinfo.name, "/system/bin/linker", sizeof(linker_soinfo.name)); 19921a57f9f75c5752d990a2749b000ec4ceace94b54Pavel Chupin#endif 1993d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_soinfo.flags = 0; 1994d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_soinfo.base = linker_base; 1995d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom 1996d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* 1997d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * Set the dynamic field in the link map otherwise gdb will complain with 1998d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * the following: 1999d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * warning: .dynamic section for "/system/bin/linker" is not at the 2000d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * expected address (wrong library or version mismatch?) 2001d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom */ 20020266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_base); 2003faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_base + elf_hdr->e_phoff); 2004d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, 2005d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom &linker_soinfo.dynamic, NULL, NULL); 2006d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom insert_soinfo_into_debug_map(&linker_soinfo); 2007d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 20081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 200942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Extract information passed from the kernel. 20100266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->phdr = reinterpret_cast<ElfW(Phdr)*>(args.getauxval(AT_PHDR)); 201142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->phnum = args.getauxval(AT_PHNUM); 201242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes si->entry = args.getauxval(AT_ENTRY); 20131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20148180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner /* Compute the value of si->base. We can't rely on the fact that 20158180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * the first entry is the PHDR because this will not be true 20168180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner * for certain executables (e.g. some in the NDK unit test suite) 20178180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner */ 20188180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner si->base = 0; 2019b52e4385c403d18a68309e568ac729c787d900c4David 'Digit' Turner si->size = phdr_table_get_load_size(si->phdr, si->phnum); 2020bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner si->load_bias = 0; 2021ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes for (size_t i = 0; i < si->phnum; ++i) { 202242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes if (si->phdr[i].p_type == PT_PHDR) { 20230266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->load_bias = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_vaddr; 20240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes si->base = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_offset; 202542b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes break; 202642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 20278180b08fb2f27052f9df2ae4787bb5bf409f13e0David 'Digit' Turner } 2028d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom si->dynamic = NULL; 2029ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes si->ref_count = 1; 20301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 20312aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base); 20322aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich if (elf_hdr->e_type != ET_DYN) { 20332aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n"); 20342aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich exit(EXIT_FAILURE); 20352aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich } 20362aebf5429bb1241a3298b5b642d38f73124c2026Nick Kralevich 20374688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). 20384688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_LIBRARY_PATH(ldpath_env); 20394688279db5dcc4004941e7f133c4a1c3617d842cElliott Hughes parse_LD_PRELOAD(ldpreload_env); 20404fd42c1dc002fa19349fa0d4ef97757eb1815032Matt Fischer 20415ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel somain = si; 20425ae44f302b7d1d19f25c4c6f125e32dc369961d9Ard Biesheuvel 2043183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(si, NULL)) { 2044650be4e584eeab3591b9e273bfd6d169eea60853Elliott Hughes __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer()); 204518a206c81d9743481e364384affd43306911283dElliott Hughes exit(EXIT_FAILURE); 20461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2048c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov add_vdso(args); 2049c45087bffa528c0809f0df2e0a3708eba7018b33Sergey Melnikov 2050d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallPreInitConstructors(); 20519181a5dcfe69199415c7aebf93524cc3dd6f8a6fEvgeniy Stepanov 2052d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (size_t i = 0; gLdPreloads[i] != NULL; ++i) { 2053d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom gLdPreloads[i]->CallConstructors(); 2054326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng } 2055326e85eca6916eb904649f7bff65244a40088ba7Kito Cheng 2056d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom /* After the link_image, the si->load_bias is initialized. 2057d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * For so lib, the map->l_addr will be updated in notify_gdb_of_load. 2058d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * We need to update this value for so exe here. So Unwind_Backtrace 2059d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom * for some arch like x86 could work correctly within so exe. 20609c3449ecd9d5e9cdb1e995e35e53334a4a288a5eXiaokang Qin */ 2061c5db969aa4a24a76fc0964f2ff89533e832b47a6Chao-Ying Fu map->l_addr = si->load_bias; 2062d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes si->CallConstructors(); 2063e83c56dfbb6a9a61f0f18031620322af97e80162Evgeniy Stepanov 20641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING 2065faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes gettimeofday(&t1, NULL); 2066ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("LINKER TIME: %s: %d microseconds", args.argv[0], (int) ( 20671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - 2068faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec))); 20691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 20701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if STATS 2071ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol", args.argv[0], 2072bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocAbsolute], 2073bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocRelative], 2074bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocCopy], 2075bedfe38b8ba512dd6236c00e8b4a9b01c2bd1281Elliott Hughes linker_stats.count[kRelocSymbol]); 20761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 20771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if COUNT_PAGES 20781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project { 20791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned n; 20801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned i; 20811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned count = 0; 2082d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (n = 0; n < 4096; n++) { 2083d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (bitmask[n]) { 20841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project unsigned x = bitmask[n]; 2085e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#if defined(__LP64__) 2086e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland for (i = 0; i < 32; i++) { 2087e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#else 2088d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom for (i = 0; i < 8; i++) { 2089e365f9d6543bc6607864ef61257505239dde15d1Marcus Oakland#endif 2090d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom if (x & 1) { 2091d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom count++; 2092d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom } 20931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project x >>= 1; 20941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 2097ca0c11bd823f37f03cc8067cb182876827d5275aElliott Hughes PRINT("PAGES MODIFIED: %s: %d (%dKB)", args.argv[0], count, count * 4); 20981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 20991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 21011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#if TIMING || STATS || COUNT_PAGES 21021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fflush(stdout); 21031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#endif 21041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 2105c00f2cb587630d5e954c7f548749f1e3170b3cb1Elliott Hughes TRACE("[ Ready to execute '%s' @ %p ]", si->name, reinterpret_cast<void*>(si->entry)); 21061dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return si->entry; 21071dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 2108468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 2109bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner/* Compute the load-bias of an existing executable. This shall only 2110bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * be used to compute the load bias of an executable or shared library 2111bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * that was loaded by the kernel itself. 2112bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * 2113bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Input: 2114bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * elf -> address of ELF header, assumed to be at the start of the file. 2115bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * Return: 2116bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * load bias, i.e. add the value of any p_vaddr in the file to get 2117bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner * the corresponding address in memory. 2118bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner */ 21190266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesstatic ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) { 21200266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) offset = elf->e_phoff; 2121faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes const ElfW(Phdr)* phdr_table = reinterpret_cast<const ElfW(Phdr)*>(reinterpret_cast<uintptr_t>(elf) + offset); 21220266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes const ElfW(Phdr)* phdr_end = phdr_table + elf->e_phnum; 2123fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng 21240266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes for (const ElfW(Phdr)* phdr = phdr_table; phdr < phdr_end; phdr++) { 2125fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng if (phdr->p_type == PT_LOAD) { 21260266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes return reinterpret_cast<ElfW(Addr)>(elf) + phdr->p_offset - phdr->p_vaddr; 2127bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner } 2128fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng } 2129fa8c05dc00bb41ae8fe5cb5e4f82816e30f7f7b2Kito Cheng return 0; 2130bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner} 2131bea23e59f7145537fd4e600ae67fa92a798872cfDavid 'Digit' Turner 2132468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich/* 2133468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * This is the entry point for the linker, called from begin.S. This 2134468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * method is responsible for fixing the linker's own relocations, and 2135468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * then calling __linker_init_post_relocation(). 2136468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * 2137468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * Because this method is called before the linker has fixed it's own 2138468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * relocations, any attempt to reference an extern variable, extern 2139468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich * function, or other GOT reference will generate a segfault. 2140468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich */ 21410266ae5f884d72da58f33a072e865ba131234a5eElliott Hughesextern "C" ElfW(Addr) __linker_init(void* raw_args) { 214242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes KernelArgumentBlock args(raw_args); 214342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 21440266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) linker_addr = args.getauxval(AT_BASE); 21450266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr); 2146faf05bacd45719291b371f24b1b89543881b37f6Elliott Hughes ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff); 214742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 214842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes soinfo linker_so; 214942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes memset(&linker_so, 0, sizeof(soinfo)); 215042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2151b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes strcpy(linker_so.name, "[dynamic linker]"); 215242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.base = linker_addr; 215342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); 215442b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); 2155d4ee82dfa3ba01baa10e3ca48fcb31a27b8a4e81Brian Carlstrom linker_so.dynamic = NULL; 215642b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phdr = phdr; 215742b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.phnum = elf_hdr->e_phnum; 215842b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes linker_so.flags |= FLAG_LINKER; 215942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes 2160183ad9df536ab04ef35a397a1f4724e4e401d11fTorne (Richard Coles) if (!soinfo_link_image(&linker_so, NULL)) { 216142b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // It would be nice to print an error message, but if the linker 216242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // can't link itself, there's no guarantee that we'll be able to 2163b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // call write() (because it involves a GOT reference). We may as 2164b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes // well try though... 2165b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes const char* msg = "CANNOT LINK EXECUTABLE: "; 2166b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, msg, strlen(msg)); 2167b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); 2168b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes write(2, "\n", 1); 2169b93702a0463fa0b87bf25d7ae9bdb09a35ea6a50Elliott Hughes _exit(EXIT_FAILURE); 217042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes } 2171468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich 217242b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // We have successfully fixed our own relocations. It's safe to run 217342b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // the main part of the linker now. 21740d787c1fa18c6a1f29ef9840e28a68cf077be1deElliott Hughes args.abort_message_ptr = &gAbortMessage; 21750266ae5f884d72da58f33a072e865ba131234a5eElliott Hughes ElfW(Addr) start_address = __linker_init_post_relocation(args, linker_addr); 21765419b9474753d25dff947c7740532f86d130c0beElliott Hughes 2177d597d263bc32422402d4810ce4ec070f0227c2f7Dmitriy Ivanov gSoInfoAllocator.protect_all(PROT_READ); 2178d23736e4f228e46304b7cbc674a1d0094d73e0f5Elliott Hughes 217942b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes // Return the address that the calling assembly stub should jump to. 218042b2c6a5eed5e4ef35315b8cd32d1355f12a69b6Elliott Hughes return start_address; 2181468319ce4f3f7383d788b76c09cda2a405311f36Nick Kralevich} 2182