The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /* |
Doug Kwan | 9430435 | 2009-10-23 18:11:40 -0700 | [diff] [blame] | 2 | * Copyright (C) 2008, 2009 The Android Open Source Project |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 18 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 19 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 22 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 25 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 29 | #include <dlfcn.h> |
| 30 | #include <errno.h> |
| 31 | #include <fcntl.h> |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 32 | #include <inttypes.h> |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 33 | #include <pthread.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 34 | #include <stdio.h> |
| 35 | #include <stdlib.h> |
| 36 | #include <string.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 37 | #include <sys/atomics.h> |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 38 | #include <sys/mman.h> |
| 39 | #include <sys/stat.h> |
| 40 | #include <unistd.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 41 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 42 | // Private C library headers. |
Elliott Hughes | eb847bc | 2013-10-09 15:50:50 -0700 | [diff] [blame] | 43 | #include "private/bionic_tls.h" |
| 44 | #include "private/KernelArgumentBlock.h" |
| 45 | #include "private/ScopedPthreadMutexLocker.h" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 46 | |
| 47 | #include "linker.h" |
| 48 | #include "linker_debug.h" |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 49 | #include "linker_environ.h" |
David 'Digit' Turner | 23363ed | 2012-06-18 18:13:49 +0200 | [diff] [blame] | 50 | #include "linker_phdr.h" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 51 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 52 | /* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< |
| 53 | * |
| 54 | * Do NOT use malloc() and friends or pthread_*() code here. |
| 55 | * Don't use printf() either; it's caused mysterious memory |
| 56 | * corruption in the past. |
| 57 | * The linker runs before we bring up libc and it's easiest |
| 58 | * to make sure it does not depend on any complex libc features |
| 59 | * |
| 60 | * open issues / todo: |
| 61 | * |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 62 | * - are we doing everything we should for ARM_COPY relocations? |
| 63 | * - cleaner error reporting |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 64 | * - after linking, set as much stuff as possible to READONLY |
| 65 | * and NOEXEC |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 66 | */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 67 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 68 | static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 69 | static ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 70 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 71 | // We can't use malloc(3) in the dynamic linker. We use a linked list of anonymous |
| 72 | // maps, each a single page in size. The pages are broken up into as many struct soinfo |
| 73 | // objects as will fit, and they're all threaded together on a free list. |
| 74 | #define SOINFO_PER_POOL ((PAGE_SIZE - sizeof(soinfo_pool_t*)) / sizeof(soinfo)) |
| 75 | struct soinfo_pool_t { |
| 76 | soinfo_pool_t* next; |
| 77 | soinfo info[SOINFO_PER_POOL]; |
| 78 | }; |
| 79 | static struct soinfo_pool_t* gSoInfoPools = NULL; |
| 80 | static soinfo* gSoInfoFreeList = NULL; |
| 81 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 82 | static soinfo* solist = &libdl_info; |
| 83 | static soinfo* sonext = &libdl_info; |
| 84 | static soinfo* somain; /* main process, always the one after libdl_info */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 85 | |
Elliott Hughes | a4aafd1 | 2014-01-13 16:37:47 -0800 | [diff] [blame] | 86 | static const char* const gDefaultLdPaths[] = { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 87 | #if defined(__LP64__) |
Elliott Hughes | 011bc0b | 2013-10-08 14:27:10 -0700 | [diff] [blame] | 88 | "/vendor/lib64", |
| 89 | "/system/lib64", |
| 90 | #else |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 91 | "/vendor/lib", |
| 92 | "/system/lib", |
Elliott Hughes | 011bc0b | 2013-10-08 14:27:10 -0700 | [diff] [blame] | 93 | #endif |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 94 | NULL |
| 95 | }; |
David Bartley | bc3a5c2 | 2009-06-02 18:27:28 -0700 | [diff] [blame] | 96 | |
Elliott Hughes | a4aafd1 | 2014-01-13 16:37:47 -0800 | [diff] [blame] | 97 | #define LDPATH_BUFSIZE (LDPATH_MAX*64) |
| 98 | #define LDPATH_MAX 8 |
| 99 | |
| 100 | #define LDPRELOAD_BUFSIZE (LDPRELOAD_MAX*64) |
| 101 | #define LDPRELOAD_MAX 8 |
| 102 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 103 | static char gLdPathsBuffer[LDPATH_BUFSIZE]; |
| 104 | static const char* gLdPaths[LDPATH_MAX + 1]; |
| 105 | |
| 106 | static char gLdPreloadsBuffer[LDPRELOAD_BUFSIZE]; |
| 107 | static const char* gLdPreloadNames[LDPRELOAD_MAX + 1]; |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 108 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 109 | static soinfo* gLdPreloads[LDPRELOAD_MAX + 1]; |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 110 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 111 | __LIBC_HIDDEN__ int gLdDebugVerbosity; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 112 | |
Elliott Hughes | 0d787c1 | 2013-04-04 13:46:46 -0700 | [diff] [blame] | 113 | __LIBC_HIDDEN__ abort_msg_t* gAbortMessage = NULL; // For debuggerd. |
| 114 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 115 | enum RelocationKind { |
| 116 | kRelocAbsolute = 0, |
| 117 | kRelocRelative, |
| 118 | kRelocCopy, |
| 119 | kRelocSymbol, |
| 120 | kRelocMax |
| 121 | }; |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 122 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 123 | #if STATS |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 124 | struct linker_stats_t { |
| 125 | int count[kRelocMax]; |
| 126 | }; |
| 127 | |
| 128 | static linker_stats_t linker_stats; |
| 129 | |
| 130 | static void count_relocation(RelocationKind kind) { |
| 131 | ++linker_stats.count[kind]; |
| 132 | } |
| 133 | #else |
| 134 | static void count_relocation(RelocationKind) { |
| 135 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 136 | #endif |
| 137 | |
| 138 | #if COUNT_PAGES |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 139 | static unsigned bitmask[4096]; |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 140 | #if defined(__LP64__) |
| 141 | #define MARK(offset) \ |
| 142 | do { \ |
| 143 | if ((((offset) >> 12) >> 5) < 4096) \ |
| 144 | bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \ |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 145 | } while (0) |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 146 | #else |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 147 | #define MARK(offset) \ |
| 148 | do { \ |
| 149 | bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 150 | } while (0) |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 151 | #endif |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 152 | #else |
| 153 | #define MARK(x) do {} while (0) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 154 | #endif |
| 155 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 156 | // You shouldn't try to call memory-allocating functions in the dynamic linker. |
| 157 | // Guard against the most obvious ones. |
Elliott Hughes | 8f2a5a0 | 2013-03-15 15:30:25 -0700 | [diff] [blame] | 158 | #define DISALLOW_ALLOCATION(return_type, name, ...) \ |
| 159 | return_type name __VA_ARGS__ \ |
| 160 | { \ |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 161 | const char* msg = "ERROR: " #name " called from the dynamic linker!\n"; \ |
Elliott Hughes | 8f2a5a0 | 2013-03-15 15:30:25 -0700 | [diff] [blame] | 162 | __libc_format_log(ANDROID_LOG_FATAL, "linker", "%s", msg); \ |
| 163 | write(2, msg, strlen(msg)); \ |
| 164 | abort(); \ |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 165 | } |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 166 | DISALLOW_ALLOCATION(void*, malloc, (size_t u __unused)); |
| 167 | DISALLOW_ALLOCATION(void, free, (void* u __unused)); |
| 168 | DISALLOW_ALLOCATION(void*, realloc, (void* u1 __unused, size_t u2 __unused)); |
| 169 | DISALLOW_ALLOCATION(void*, calloc, (size_t u1 __unused, size_t u2 __unused)); |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 170 | |
Dima Zavin | 0353195 | 2009-05-29 17:30:25 -0700 | [diff] [blame] | 171 | static char tmp_err_buf[768]; |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 172 | static char __linker_dl_err_buf[768]; |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 173 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 174 | char* linker_get_error_buffer() { |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 175 | return &__linker_dl_err_buf[0]; |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 178 | size_t linker_get_error_buffer_size() { |
| 179 | return sizeof(__linker_dl_err_buf); |
| 180 | } |
| 181 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 182 | /* |
| 183 | * This function is an empty stub where GDB locates a breakpoint to get notified |
| 184 | * about linker activity. |
| 185 | */ |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 186 | extern "C" void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 187 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 188 | static r_debug _r_debug = {1, NULL, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0}; |
| 189 | static link_map* r_debug_tail = 0; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 190 | |
Elliott Hughes | 3b297c4 | 2012-10-11 16:08:51 -0700 | [diff] [blame] | 191 | static pthread_mutex_t gDebugMutex = PTHREAD_MUTEX_INITIALIZER; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 192 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 193 | static void insert_soinfo_into_debug_map(soinfo* info) { |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 194 | // Copy the necessary fields into the debug structure. |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 195 | link_map* map = &(info->link_map_head); |
Sergey Melnikov | ebd506c | 2013-10-31 18:02:12 +0400 | [diff] [blame] | 196 | map->l_addr = info->load_bias; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 197 | map->l_name = reinterpret_cast<char*>(info->name); |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 198 | map->l_ld = info->dynamic; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 199 | |
| 200 | /* Stick the new library at the end of the list. |
| 201 | * gdb tends to care more about libc than it does |
| 202 | * about leaf libraries, and ordering it this way |
| 203 | * reduces the back-and-forth over the wire. |
| 204 | */ |
| 205 | if (r_debug_tail) { |
| 206 | r_debug_tail->l_next = map; |
| 207 | map->l_prev = r_debug_tail; |
| 208 | map->l_next = 0; |
| 209 | } else { |
| 210 | _r_debug.r_map = map; |
| 211 | map->l_prev = 0; |
| 212 | map->l_next = 0; |
| 213 | } |
| 214 | r_debug_tail = map; |
| 215 | } |
| 216 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 217 | static void remove_soinfo_from_debug_map(soinfo* info) { |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 218 | link_map* map = &(info->link_map_head); |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 219 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 220 | if (r_debug_tail == map) { |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 221 | r_debug_tail = map->l_prev; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 222 | } |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 223 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 224 | if (map->l_prev) { |
| 225 | map->l_prev->l_next = map->l_next; |
| 226 | } |
| 227 | if (map->l_next) { |
| 228 | map->l_next->l_prev = map->l_prev; |
| 229 | } |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 232 | static void notify_gdb_of_load(soinfo* info) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 233 | if (info->flags & FLAG_EXE) { |
| 234 | // GDB already knows about the main executable |
| 235 | return; |
| 236 | } |
| 237 | |
Elliott Hughes | 3b297c4 | 2012-10-11 16:08:51 -0700 | [diff] [blame] | 238 | ScopedPthreadMutexLocker locker(&gDebugMutex); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 239 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 240 | _r_debug.r_state = r_debug::RT_ADD; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 241 | rtld_db_dlactivity(); |
| 242 | |
| 243 | insert_soinfo_into_debug_map(info); |
| 244 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 245 | _r_debug.r_state = r_debug::RT_CONSISTENT; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 246 | rtld_db_dlactivity(); |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 249 | static void notify_gdb_of_unload(soinfo* info) { |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 250 | if (info->flags & FLAG_EXE) { |
| 251 | // GDB already knows about the main executable |
| 252 | return; |
| 253 | } |
| 254 | |
Elliott Hughes | 3b297c4 | 2012-10-11 16:08:51 -0700 | [diff] [blame] | 255 | ScopedPthreadMutexLocker locker(&gDebugMutex); |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 256 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 257 | _r_debug.r_state = r_debug::RT_DELETE; |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 258 | rtld_db_dlactivity(); |
| 259 | |
| 260 | remove_soinfo_from_debug_map(info); |
| 261 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 262 | _r_debug.r_state = r_debug::RT_CONSISTENT; |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 263 | rtld_db_dlactivity(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 264 | } |
| 265 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 266 | void notify_gdb_of_libraries() { |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 267 | _r_debug.r_state = r_debug::RT_ADD; |
| 268 | rtld_db_dlactivity(); |
| 269 | _r_debug.r_state = r_debug::RT_CONSISTENT; |
| 270 | rtld_db_dlactivity(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 271 | } |
| 272 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 273 | static bool ensure_free_list_non_empty() { |
| 274 | if (gSoInfoFreeList != NULL) { |
| 275 | return true; |
| 276 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 277 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 278 | // Allocate a new pool. |
| 279 | soinfo_pool_t* pool = reinterpret_cast<soinfo_pool_t*>(mmap(NULL, sizeof(*pool), |
| 280 | PROT_READ|PROT_WRITE, |
| 281 | MAP_PRIVATE|MAP_ANONYMOUS, 0, 0)); |
| 282 | if (pool == MAP_FAILED) { |
| 283 | return false; |
| 284 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 285 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 286 | // Add the pool to our list of pools. |
| 287 | pool->next = gSoInfoPools; |
| 288 | gSoInfoPools = pool; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 289 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 290 | // Chain the entries in the new pool onto the free list. |
| 291 | gSoInfoFreeList = &pool->info[0]; |
| 292 | soinfo* next = NULL; |
| 293 | for (int i = SOINFO_PER_POOL - 1; i >= 0; --i) { |
| 294 | pool->info[i].next = next; |
| 295 | next = &pool->info[i]; |
| 296 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 297 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 298 | return true; |
| 299 | } |
| 300 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 301 | static void set_soinfo_pool_protection(int protection) { |
| 302 | for (soinfo_pool_t* p = gSoInfoPools; p != NULL; p = p->next) { |
| 303 | if (mprotect(p, sizeof(*p), protection) == -1) { |
| 304 | abort(); // Can't happen. |
| 305 | } |
| 306 | } |
| 307 | } |
| 308 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 309 | static soinfo* soinfo_alloc(const char* name) { |
| 310 | if (strlen(name) >= SOINFO_NAME_LEN) { |
| 311 | DL_ERR("library name \"%s\" too long", name); |
| 312 | return NULL; |
| 313 | } |
| 314 | |
| 315 | if (!ensure_free_list_non_empty()) { |
| 316 | DL_ERR("out of memory when loading \"%s\"", name); |
| 317 | return NULL; |
| 318 | } |
| 319 | |
| 320 | // Take the head element off the free list. |
| 321 | soinfo* si = gSoInfoFreeList; |
| 322 | gSoInfoFreeList = gSoInfoFreeList->next; |
| 323 | |
| 324 | // Initialize the new element. |
| 325 | memset(si, 0, sizeof(soinfo)); |
| 326 | strlcpy(si->name, name, sizeof(si->name)); |
| 327 | sonext->next = si; |
| 328 | sonext = si; |
| 329 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 330 | TRACE("name %s: allocated soinfo @ %p", name, si); |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 331 | return si; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 332 | } |
| 333 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 334 | static void soinfo_free(soinfo* si) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 335 | if (si == NULL) { |
| 336 | return; |
| 337 | } |
| 338 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 339 | soinfo *prev = NULL, *trav; |
| 340 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 341 | TRACE("name %s: freeing soinfo @ %p", si->name, si); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 342 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 343 | for (trav = solist; trav != NULL; trav = trav->next) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 344 | if (trav == si) |
| 345 | break; |
| 346 | prev = trav; |
| 347 | } |
| 348 | if (trav == NULL) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 349 | /* si was not in solist */ |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 350 | DL_ERR("name \"%s\" is not in solist!", si->name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 351 | return; |
| 352 | } |
| 353 | |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 354 | /* prev will never be NULL, because the first entry in solist is |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 355 | always the static libdl_info. |
| 356 | */ |
| 357 | prev->next = si->next; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 358 | if (si == sonext) { |
| 359 | sonext = prev; |
| 360 | } |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 361 | si->next = gSoInfoFreeList; |
| 362 | gSoInfoFreeList = si; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 363 | } |
| 364 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 365 | |
| 366 | static void parse_path(const char* path, const char* delimiters, |
| 367 | const char** array, char* buf, size_t buf_size, size_t max_count) { |
| 368 | if (path == NULL) { |
| 369 | return; |
| 370 | } |
| 371 | |
| 372 | size_t len = strlcpy(buf, path, buf_size); |
| 373 | |
| 374 | size_t i = 0; |
| 375 | char* buf_p = buf; |
| 376 | while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { |
| 377 | if (*array[i] != '\0') { |
| 378 | ++i; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | // Forget the last path if we had to truncate; this occurs if the 2nd to |
| 383 | // last char isn't '\0' (i.e. wasn't originally a delimiter). |
| 384 | if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { |
| 385 | array[i - 1] = NULL; |
| 386 | } else { |
| 387 | array[i] = NULL; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | static void parse_LD_LIBRARY_PATH(const char* path) { |
| 392 | parse_path(path, ":", gLdPaths, |
| 393 | gLdPathsBuffer, sizeof(gLdPathsBuffer), LDPATH_MAX); |
| 394 | } |
| 395 | |
| 396 | static void parse_LD_PRELOAD(const char* path) { |
| 397 | // We have historically supported ':' as well as ' ' in LD_PRELOAD. |
| 398 | parse_path(path, " :", gLdPreloadNames, |
| 399 | gLdPreloadsBuffer, sizeof(gLdPreloadsBuffer), LDPRELOAD_MAX); |
| 400 | } |
| 401 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 402 | #if defined(__arm__) |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 403 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 404 | /* For a given PC, find the .so that it belongs to. |
| 405 | * Returns the base address of the .ARM.exidx section |
| 406 | * for that .so, and the number of 8-byte entries |
| 407 | * in that section (via *pcount). |
| 408 | * |
| 409 | * Intended to be called by libc's __gnu_Unwind_Find_exidx(). |
| 410 | * |
Elliott Hughes | 3b297c4 | 2012-10-11 16:08:51 -0700 | [diff] [blame] | 411 | * This function is exposed via dlfcn.cpp and libdl.so. |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 412 | */ |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 413 | _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 414 | unsigned addr = (unsigned)pc; |
| 415 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 416 | for (soinfo* si = solist; si != 0; si = si->next) { |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 417 | if ((addr >= si->base) && (addr < (si->base + si->size))) { |
| 418 | *pcount = si->ARM_exidx_count; |
Ji-Hwan Lee | f186a18 | 2012-05-31 20:20:36 +0900 | [diff] [blame] | 419 | return (_Unwind_Ptr)si->ARM_exidx; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 420 | } |
| 421 | } |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 422 | *pcount = 0; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 423 | return NULL; |
| 424 | } |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 425 | |
Christopher Ferris | 24053a4 | 2013-08-19 17:45:09 -0700 | [diff] [blame] | 426 | #endif |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 427 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 428 | /* Here, we only have to provide a callback to iterate across all the |
| 429 | * loaded libraries. gcc_eh does the rest. */ |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 430 | int dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 431 | int rv = 0; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 432 | for (soinfo* si = solist; si != NULL; si = si->next) { |
| 433 | dl_phdr_info dl_info; |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 434 | dl_info.dlpi_addr = si->link_map_head.l_addr; |
| 435 | dl_info.dlpi_name = si->link_map_head.l_name; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 436 | dl_info.dlpi_phdr = si->phdr; |
| 437 | dl_info.dlpi_phnum = si->phnum; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 438 | rv = cb(&dl_info, sizeof(dl_phdr_info), data); |
| 439 | if (rv != 0) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 440 | break; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 441 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 442 | } |
| 443 | return rv; |
| 444 | } |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 445 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 446 | static ElfW(Sym)* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) { |
| 447 | ElfW(Sym)* symtab = si->symtab; |
| 448 | const char* strtab = si->strtab; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 449 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 450 | TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", |
| 451 | name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 452 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 453 | for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { |
| 454 | ElfW(Sym)* s = symtab + n; |
| 455 | if (strcmp(strtab + s->st_name, name)) continue; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 456 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 457 | /* only concern ourselves with global and weak symbol definitions */ |
| 458 | switch (ELF_ST_BIND(s->st_info)) { |
| 459 | case STB_GLOBAL: |
| 460 | case STB_WEAK: |
| 461 | if (s->st_shndx == SHN_UNDEF) { |
| 462 | continue; |
| 463 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 464 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 465 | TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", |
| 466 | name, si->name, reinterpret_cast<void*>(s->st_value), |
| 467 | static_cast<size_t>(s->st_size)); |
| 468 | return s; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 469 | } |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 470 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 471 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 472 | return NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 473 | } |
| 474 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 475 | static unsigned elfhash(const char* _name) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 476 | const unsigned char* name = reinterpret_cast<const unsigned char*>(_name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 477 | unsigned h = 0, g; |
| 478 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 479 | while (*name) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 480 | h = (h << 4) + *name++; |
| 481 | g = h & 0xf0000000; |
| 482 | h ^= g; |
| 483 | h ^= g >> 24; |
| 484 | } |
| 485 | return h; |
| 486 | } |
| 487 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 488 | static ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, soinfo* needed[]) { |
Doug Kwan | 9430435 | 2009-10-23 18:11:40 -0700 | [diff] [blame] | 489 | unsigned elf_hash = elfhash(name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 490 | ElfW(Sym)* s = NULL; |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 491 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 492 | if (si != NULL && somain != NULL) { |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 493 | /* |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 494 | * Local scope is executable scope. Just start looking into it right away |
| 495 | * for the shortcut. |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 496 | */ |
| 497 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 498 | if (si == somain) { |
| 499 | s = soinfo_elf_lookup(si, elf_hash, name); |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 500 | if (s != NULL) { |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 501 | *lsi = si; |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 502 | goto done; |
| 503 | } |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 504 | } else { |
| 505 | /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 506 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 507 | /* |
| 508 | * If this object was built with symbolic relocations disabled, the |
| 509 | * first place to look to resolve external references is the main |
| 510 | * executable. |
| 511 | */ |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 512 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 513 | if (!si->has_DT_SYMBOLIC) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 514 | DEBUG("%s: looking up %s in executable %s", |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 515 | si->name, name, somain->name); |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 516 | s = soinfo_elf_lookup(somain, elf_hash, name); |
| 517 | if (s != NULL) { |
| 518 | *lsi = somain; |
| 519 | goto done; |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | /* Look for symbols in the local scope (the object who is |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 524 | * searching). This happens with C++ templates on x86 for some |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 525 | * reason. |
| 526 | * |
| 527 | * Notes on weak symbols: |
| 528 | * The ELF specs are ambiguous about treatment of weak definitions in |
| 529 | * dynamic linking. Some systems return the first definition found |
| 530 | * and some the first non-weak definition. This is system dependent. |
| 531 | * Here we return the first definition found for simplicity. */ |
| 532 | |
| 533 | s = soinfo_elf_lookup(si, elf_hash, name); |
| 534 | if (s != NULL) { |
| 535 | *lsi = si; |
| 536 | goto done; |
| 537 | } |
| 538 | |
| 539 | /* |
| 540 | * If this object was built with -Bsymbolic and symbol is not found |
| 541 | * in the local scope, try to find the symbol in the main executable. |
| 542 | */ |
| 543 | |
| 544 | if (si->has_DT_SYMBOLIC) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 545 | DEBUG("%s: looking up %s in executable %s after local scope", |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 546 | si->name, name, somain->name); |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 547 | s = soinfo_elf_lookup(somain, elf_hash, name); |
| 548 | if (s != NULL) { |
| 549 | *lsi = somain; |
| 550 | goto done; |
| 551 | } |
| 552 | } |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 553 | } |
Nick Kralevich | d39c3ab | 2012-08-24 13:25:51 -0700 | [diff] [blame] | 554 | } |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 555 | |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 556 | /* Next, look for it in the preloads list */ |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 557 | for (int i = 0; gLdPreloads[i] != NULL; i++) { |
| 558 | s = soinfo_elf_lookup(gLdPreloads[i], elf_hash, name); |
| 559 | if (s != NULL) { |
| 560 | *lsi = gLdPreloads[i]; |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 561 | goto done; |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 562 | } |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 563 | } |
| 564 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 565 | for (int i = 0; needed[i] != NULL; i++) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 566 | DEBUG("%s: looking up %s in %s", |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 567 | si->name, name, needed[i]->name); |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 568 | s = soinfo_elf_lookup(needed[i], elf_hash, name); |
| 569 | if (s != NULL) { |
| 570 | *lsi = needed[i]; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 571 | goto done; |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 572 | } |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | done: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 576 | if (s != NULL) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 577 | TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " |
| 578 | "found in %s, base = %p, load bias = %p", |
| 579 | si->name, name, reinterpret_cast<void*>(s->st_value), |
| 580 | (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), |
| 581 | reinterpret_cast<void*>((*lsi)->load_bias)); |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 582 | return s; |
| 583 | } |
| 584 | |
Doug Kwan | 9430435 | 2009-10-23 18:11:40 -0700 | [diff] [blame] | 585 | return NULL; |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 586 | } |
| 587 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 588 | /* This is used by dlsym(3). It performs symbol lookup only within the |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 589 | specified soinfo object and not in any of its dependencies. |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 590 | |
| 591 | TODO: Only looking in the specified soinfo seems wrong. dlsym(3) says |
| 592 | that it should do a breadth first search through the dependency |
| 593 | tree. This agrees with the ELF spec (aka System V Application |
| 594 | Binary Interface) where in Chapter 5 it discuss resolving "Shared |
| 595 | Object Dependencies" in breadth first search order. |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 596 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 597 | ElfW(Sym)* dlsym_handle_lookup(soinfo* si, const char* name) { |
David 'Digit' Turner | 1608416 | 2012-06-12 16:25:37 +0200 | [diff] [blame] | 598 | return soinfo_elf_lookup(si, elfhash(name), name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 599 | } |
| 600 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 601 | /* This is used by dlsym(3) to performs a global symbol lookup. If the |
| 602 | start value is null (for RTLD_DEFAULT), the search starts at the |
| 603 | beginning of the global solist. Otherwise the search starts at the |
| 604 | specified soinfo (for RTLD_NEXT). |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 605 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 606 | ElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start) { |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 607 | unsigned elf_hash = elfhash(name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 608 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 609 | if (start == NULL) { |
| 610 | start = solist; |
| 611 | } |
| 612 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 613 | ElfW(Sym)* s = NULL; |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 614 | for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { |
| 615 | s = soinfo_elf_lookup(si, elf_hash, name); |
| 616 | if (s != NULL) { |
| 617 | *found = si; |
| 618 | break; |
Matt Fischer | 1698d9e | 2009-12-31 12:17:56 -0600 | [diff] [blame] | 619 | } |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 620 | } |
Matt Fischer | 1698d9e | 2009-12-31 12:17:56 -0600 | [diff] [blame] | 621 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 622 | if (s != NULL) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 623 | TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", |
| 624 | name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 625 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 626 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 627 | return s; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 628 | } |
| 629 | |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 630 | soinfo* find_containing_library(const void* p) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 631 | ElfW(Addr) address = reinterpret_cast<ElfW(Addr)>(p); |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 632 | for (soinfo* si = solist; si != NULL; si = si->next) { |
| 633 | if (address >= si->base && address - si->base < si->size) { |
| 634 | return si; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 635 | } |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 636 | } |
| 637 | return NULL; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 638 | } |
| 639 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 640 | ElfW(Sym)* dladdr_find_symbol(soinfo* si, const void* addr) { |
| 641 | ElfW(Addr) soaddr = reinterpret_cast<ElfW(Addr)>(addr) - si->base; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 642 | |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 643 | // Search the library's symbol table for any defined symbol which |
| 644 | // contains this address. |
| 645 | for (size_t i = 0; i < si->nchain; ++i) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 646 | ElfW(Sym)* sym = &si->symtab[i]; |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 647 | if (sym->st_shndx != SHN_UNDEF && |
| 648 | soaddr >= sym->st_value && |
| 649 | soaddr < sym->st_value + sym->st_size) { |
| 650 | return sym; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 651 | } |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 652 | } |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 653 | |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 654 | return NULL; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 655 | } |
| 656 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 657 | static int open_library_on_path(const char* name, const char* const paths[]) { |
| 658 | char buf[512]; |
| 659 | for (size_t i = 0; paths[i] != NULL; ++i) { |
Elliott Hughes | 1e980b6 | 2013-01-17 18:36:06 -0800 | [diff] [blame] | 660 | int n = __libc_format_buffer(buf, sizeof(buf), "%s/%s", paths[i], name); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 661 | if (n < 0 || n >= static_cast<int>(sizeof(buf))) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 662 | PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 663 | continue; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 664 | } |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 665 | int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); |
| 666 | if (fd != -1) { |
| 667 | return fd; |
| 668 | } |
| 669 | } |
| 670 | return -1; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 671 | } |
| 672 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 673 | static int open_library(const char* name) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 674 | TRACE("[ opening %s ]", name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 675 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 676 | // If the name contains a slash, we should attempt to open it directly and not search the paths. |
| 677 | if (strchr(name, '/') != NULL) { |
Elliott Hughes | 6971fe4 | 2012-11-01 22:59:19 -0700 | [diff] [blame] | 678 | int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); |
| 679 | if (fd != -1) { |
| 680 | return fd; |
| 681 | } |
| 682 | // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 683 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 684 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 685 | // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. |
| 686 | int fd = open_library_on_path(name, gLdPaths); |
| 687 | if (fd == -1) { |
Elliott Hughes | a4aafd1 | 2014-01-13 16:37:47 -0800 | [diff] [blame] | 688 | fd = open_library_on_path(name, gDefaultLdPaths); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 689 | } |
| 690 | return fd; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 691 | } |
| 692 | |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 693 | static soinfo* load_library(const char* name, const android_dlextinfo* extinfo) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 694 | // Open the file. |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 695 | int fd = open_library(name); |
| 696 | if (fd == -1) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 697 | DL_ERR("library \"%s\" not found", name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 698 | return NULL; |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 699 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 700 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 701 | // Read the ELF header and load the segments. |
| 702 | ElfReader elf_reader(name, fd); |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 703 | if (!elf_reader.Load(extinfo)) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 704 | return NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 705 | } |
| 706 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 707 | const char* bname = strrchr(name, '/'); |
| 708 | soinfo* si = soinfo_alloc(bname ? bname + 1 : name); |
| 709 | if (si == NULL) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 710 | return NULL; |
David 'Digit' Turner | 23363ed | 2012-06-18 18:13:49 +0200 | [diff] [blame] | 711 | } |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 712 | si->base = elf_reader.load_start(); |
| 713 | si->size = elf_reader.load_size(); |
| 714 | si->load_bias = elf_reader.load_bias(); |
| 715 | si->flags = 0; |
| 716 | si->entry = 0; |
| 717 | si->dynamic = NULL; |
| 718 | si->phnum = elf_reader.phdr_count(); |
| 719 | si->phdr = elf_reader.loaded_phdr(); |
| 720 | return si; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 721 | } |
| 722 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 723 | static soinfo *find_loaded_library(const char* name) { |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 724 | // TODO: don't use basename only for determining libraries |
| 725 | // http://code.google.com/p/android/issues/detail?id=6670 |
| 726 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 727 | const char* bname = strrchr(name, '/'); |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 728 | bname = bname ? bname + 1 : name; |
| 729 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 730 | for (soinfo* si = solist; si != NULL; si = si->next) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 731 | if (!strcmp(bname, si->name)) { |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 732 | return si; |
| 733 | } |
| 734 | } |
| 735 | return NULL; |
| 736 | } |
| 737 | |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 738 | static soinfo* find_library_internal(const char* name, const android_dlextinfo* extinfo) { |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 739 | if (name == NULL) { |
| 740 | return somain; |
| 741 | } |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 742 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 743 | soinfo* si = find_loaded_library(name); |
| 744 | if (si != NULL) { |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 745 | if (si->flags & FLAG_LINKED) { |
| 746 | return si; |
| 747 | } |
| 748 | DL_ERR("OOPS: recursive link to \"%s\"", si->name); |
| 749 | return NULL; |
| 750 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 751 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 752 | TRACE("[ '%s' has not been loaded yet. Locating...]", name); |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 753 | si = load_library(name, extinfo); |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 754 | if (si == NULL) { |
| 755 | return NULL; |
| 756 | } |
| 757 | |
| 758 | // At this point we know that whatever is loaded @ base is a valid ELF |
| 759 | // shared library whose segments are properly mapped in. |
Weiwu Chen | 5ceb889 | 2013-12-03 19:47:34 +0800 | [diff] [blame] | 760 | TRACE("[ find_library_internal base=%p size=%zu name='%s' ]", |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 761 | reinterpret_cast<void*>(si->base), si->size, si->name); |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 762 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 763 | if (!soinfo_link_image(si, extinfo)) { |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 764 | munmap(reinterpret_cast<void*>(si->base), si->size); |
| 765 | soinfo_free(si); |
| 766 | return NULL; |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | return si; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 770 | } |
| 771 | |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 772 | static soinfo* find_library(const char* name, const android_dlextinfo* extinfo) { |
| 773 | soinfo* si = find_library_internal(name, extinfo); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 774 | if (si != NULL) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 775 | si->ref_count++; |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 776 | } |
| 777 | return si; |
| 778 | } |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 779 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 780 | static int soinfo_unload(soinfo* si) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 781 | if (si->ref_count == 1) { |
| 782 | TRACE("unloading '%s'", si->name); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 783 | si->CallDestructors(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 784 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 785 | for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 786 | if (d->d_tag == DT_NEEDED) { |
| 787 | const char* library_name = si->strtab + d->d_un.d_val; |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 788 | TRACE("%s needs to unload %s", si->name, library_name); |
| 789 | soinfo_unload(find_loaded_library(library_name)); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 790 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 791 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 792 | |
| 793 | munmap(reinterpret_cast<void*>(si->base), si->size); |
| 794 | notify_gdb_of_unload(si); |
| 795 | soinfo_free(si); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 796 | si->ref_count = 0; |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 797 | } else { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 798 | si->ref_count--; |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 799 | TRACE("not unloading '%s', decrementing ref_count to %zd", si->name, si->ref_count); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 800 | } |
| 801 | return 0; |
| 802 | } |
| 803 | |
Elliott Hughes | a4aafd1 | 2014-01-13 16:37:47 -0800 | [diff] [blame] | 804 | void do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { |
| 805 | snprintf(buffer, buffer_size, "%s:%s", gDefaultLdPaths[0], gDefaultLdPaths[1]); |
| 806 | } |
| 807 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 808 | void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { |
| 809 | if (!get_AT_SECURE()) { |
| 810 | parse_LD_LIBRARY_PATH(ld_library_path); |
| 811 | } |
| 812 | } |
| 813 | |
Torne (Richard Coles) | 012cb45 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 814 | soinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) { |
Elliott Hughes | e66190d | 2012-12-18 15:57:55 -0800 | [diff] [blame] | 815 | if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL)) != 0) { |
| 816 | DL_ERR("invalid flags to dlopen: %x", flags); |
| 817 | return NULL; |
| 818 | } |
Torne (Richard Coles) | 012cb45 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 819 | if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) { |
| 820 | DL_ERR("invalid extended flags to android_dlopen_ext: %x", extinfo->flags); |
| 821 | return NULL; |
| 822 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 823 | set_soinfo_pool_protection(PROT_READ | PROT_WRITE); |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 824 | soinfo* si = find_library(name, extinfo); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 825 | if (si != NULL) { |
| 826 | si->CallConstructors(); |
| 827 | } |
| 828 | set_soinfo_pool_protection(PROT_READ); |
| 829 | return si; |
| 830 | } |
| 831 | |
| 832 | int do_dlclose(soinfo* si) { |
| 833 | set_soinfo_pool_protection(PROT_READ | PROT_WRITE); |
| 834 | int result = soinfo_unload(si); |
| 835 | set_soinfo_pool_protection(PROT_READ); |
| 836 | return result; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 837 | } |
| 838 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 839 | #if defined(USE_RELA) |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 840 | static int soinfo_relocate(soinfo* si, ElfW(Rela)* rela, unsigned count, soinfo* needed[]) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 841 | ElfW(Sym)* s; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 842 | soinfo* lsi; |
| 843 | |
| 844 | for (size_t idx = 0; idx < count; ++idx, ++rela) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 845 | unsigned type = ELFW(R_TYPE)(rela->r_info); |
| 846 | unsigned sym = ELFW(R_SYM)(rela->r_info); |
| 847 | ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rela->r_offset + si->load_bias); |
| 848 | ElfW(Addr) sym_addr = 0; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 849 | const char* sym_name = NULL; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 850 | |
| 851 | DEBUG("Processing '%s' relocation at index %zd", si->name, idx); |
| 852 | if (type == 0) { // R_*_NONE |
| 853 | continue; |
| 854 | } |
| 855 | if (sym != 0) { |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 856 | sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 857 | s = soinfo_do_lookup(si, sym_name, &lsi, needed); |
| 858 | if (s == NULL) { |
| 859 | // We only allow an undefined symbol if this is a weak reference... |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 860 | s = &si->symtab[sym]; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 861 | if (ELF_ST_BIND(s->st_info) != STB_WEAK) { |
| 862 | DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); |
| 863 | return -1; |
| 864 | } |
| 865 | |
| 866 | /* IHI0044C AAELF 4.5.1.1: |
| 867 | |
| 868 | Libraries are not searched to resolve weak references. |
| 869 | It is not an error for a weak reference to remain unsatisfied. |
| 870 | |
| 871 | During linking, the value of an undefined weak reference is: |
| 872 | - Zero if the relocation type is absolute |
| 873 | - The address of the place if the relocation is pc-relative |
| 874 | - The address of nominal base address if the relocation |
| 875 | type is base-relative. |
| 876 | */ |
| 877 | |
| 878 | switch (type) { |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 879 | #if defined(__aarch64__) |
| 880 | case R_AARCH64_JUMP_SLOT: |
| 881 | case R_AARCH64_GLOB_DAT: |
| 882 | case R_AARCH64_ABS64: |
| 883 | case R_AARCH64_ABS32: |
| 884 | case R_AARCH64_ABS16: |
| 885 | case R_AARCH64_RELATIVE: |
| 886 | /* |
| 887 | * The sym_addr was initialized to be zero above, or the relocation |
| 888 | * code below does not care about value of sym_addr. |
| 889 | * No need to do anything. |
| 890 | */ |
| 891 | break; |
| 892 | #elif defined(__x86_64__) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 893 | case R_X86_64_JUMP_SLOT: |
| 894 | case R_X86_64_GLOB_DAT: |
| 895 | case R_X86_64_32: |
| 896 | case R_X86_64_RELATIVE: |
| 897 | // No need to do anything. |
| 898 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 899 | case R_X86_64_PC32: |
| 900 | sym_addr = reloc; |
| 901 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 902 | #endif |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 903 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 904 | DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rela, idx); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 905 | return -1; |
| 906 | } |
| 907 | } else { |
| 908 | // We got a definition. |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 909 | sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 910 | } |
| 911 | count_relocation(kRelocSymbol); |
| 912 | } else { |
| 913 | s = NULL; |
| 914 | } |
| 915 | |
| 916 | switch (type) { |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 917 | #if defined(__aarch64__) |
| 918 | case R_AARCH64_JUMP_SLOT: |
| 919 | count_relocation(kRelocAbsolute); |
| 920 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 921 | TRACE_TYPE(RELO, "RELO JMP_SLOT %16llx <- %16llx %s\n", |
| 922 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 923 | *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 924 | break; |
| 925 | case R_AARCH64_GLOB_DAT: |
| 926 | count_relocation(kRelocAbsolute); |
| 927 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 928 | TRACE_TYPE(RELO, "RELO GLOB_DAT %16llx <- %16llx %s\n", |
| 929 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 930 | *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 931 | break; |
| 932 | case R_AARCH64_ABS64: |
| 933 | count_relocation(kRelocAbsolute); |
| 934 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 935 | TRACE_TYPE(RELO, "RELO ABS64 %16llx <- %16llx %s\n", |
| 936 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 937 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 938 | break; |
| 939 | case R_AARCH64_ABS32: |
| 940 | count_relocation(kRelocAbsolute); |
| 941 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 942 | TRACE_TYPE(RELO, "RELO ABS32 %16llx <- %16llx %s\n", |
| 943 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 944 | if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && |
| 945 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { |
| 946 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 947 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 948 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 949 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), |
| 950 | static_cast<ElfW(Addr)>(INT32_MIN), |
| 951 | static_cast<ElfW(Addr)>(UINT32_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 952 | return -1; |
| 953 | } |
| 954 | break; |
| 955 | case R_AARCH64_ABS16: |
| 956 | count_relocation(kRelocAbsolute); |
| 957 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 958 | TRACE_TYPE(RELO, "RELO ABS16 %16llx <- %16llx %s\n", |
| 959 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 960 | if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && |
| 961 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { |
| 962 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 963 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 964 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 965 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), |
| 966 | static_cast<ElfW(Addr)>(INT16_MIN), |
| 967 | static_cast<ElfW(Addr)>(UINT16_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 968 | return -1; |
| 969 | } |
| 970 | break; |
| 971 | case R_AARCH64_PREL64: |
| 972 | count_relocation(kRelocRelative); |
| 973 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 974 | TRACE_TYPE(RELO, "RELO REL64 %16llx <- %16llx - %16llx %s\n", |
| 975 | reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); |
| 976 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend) - rela->r_offset; |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 977 | break; |
| 978 | case R_AARCH64_PREL32: |
| 979 | count_relocation(kRelocRelative); |
| 980 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 981 | TRACE_TYPE(RELO, "RELO REL32 %16llx <- %16llx - %16llx %s\n", |
| 982 | reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); |
| 983 | if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && |
| 984 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { |
| 985 | *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 986 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 987 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 988 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), |
| 989 | static_cast<ElfW(Addr)>(INT32_MIN), |
| 990 | static_cast<ElfW(Addr)>(UINT32_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 991 | return -1; |
| 992 | } |
| 993 | break; |
| 994 | case R_AARCH64_PREL16: |
| 995 | count_relocation(kRelocRelative); |
| 996 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 997 | TRACE_TYPE(RELO, "RELO REL16 %16llx <- %16llx - %16llx %s\n", |
| 998 | reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); |
| 999 | if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && |
| 1000 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { |
| 1001 | *reinterpret_cast<ElfW(Addr)*>(reloc) += ((sym_addr + rela->r_addend) - rela->r_offset); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1002 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1003 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 1004 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), |
| 1005 | static_cast<ElfW(Addr)>(INT16_MIN), |
| 1006 | static_cast<ElfW(Addr)>(UINT16_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1007 | return -1; |
| 1008 | } |
| 1009 | break; |
| 1010 | |
| 1011 | case R_AARCH64_RELATIVE: |
| 1012 | count_relocation(kRelocRelative); |
| 1013 | MARK(rela->r_offset); |
| 1014 | if (sym) { |
| 1015 | DL_ERR("odd RELATIVE form..."); |
| 1016 | return -1; |
| 1017 | } |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1018 | TRACE_TYPE(RELO, "RELO RELATIVE %16llx <- %16llx\n", |
| 1019 | reloc, (si->base + rela->r_addend)); |
| 1020 | *reinterpret_cast<ElfW(Addr)*>(reloc) = (si->base + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1021 | break; |
| 1022 | |
| 1023 | case R_AARCH64_COPY: |
| 1024 | if ((si->flags & FLAG_EXE) == 0) { |
| 1025 | /* |
| 1026 | * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf |
| 1027 | * |
| 1028 | * Section 4.7.1.10 "Dynamic relocations" |
| 1029 | * R_AARCH64_COPY may only appear in executable objects where e_type is |
| 1030 | * set to ET_EXEC. |
| 1031 | * |
| 1032 | * FLAG_EXE is set for both ET_DYN and ET_EXEC executables. |
| 1033 | * We should explicitly disallow ET_DYN executables from having |
| 1034 | * R_AARCH64_COPY relocations. |
| 1035 | */ |
| 1036 | DL_ERR("%s R_AARCH64_COPY relocations only supported for ET_EXEC", si->name); |
| 1037 | return -1; |
| 1038 | } |
| 1039 | count_relocation(kRelocCopy); |
| 1040 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1041 | TRACE_TYPE(RELO, "RELO COPY %16llx <- %lld @ %16llx %s\n", |
| 1042 | reloc, |
| 1043 | s->st_size, |
| 1044 | (sym_addr + rela->r_addend), |
| 1045 | sym_name); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1046 | if (reloc == (sym_addr + rela->r_addend)) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1047 | ElfW(Sym)* src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1048 | |
| 1049 | if (src == NULL) { |
| 1050 | DL_ERR("%s R_AARCH64_COPY relocation source cannot be resolved", si->name); |
| 1051 | return -1; |
| 1052 | } |
| 1053 | if (lsi->has_DT_SYMBOLIC) { |
| 1054 | DL_ERR("%s invalid R_AARCH64_COPY relocation against DT_SYMBOLIC shared " |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1055 | "library %s (built with -Bsymbolic?)", si->name, lsi->name); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1056 | return -1; |
| 1057 | } |
| 1058 | if (s->st_size < src->st_size) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1059 | DL_ERR("%s R_AARCH64_COPY relocation size mismatch (%lld < %lld)", |
| 1060 | si->name, s->st_size, src->st_size); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1061 | return -1; |
| 1062 | } |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1063 | memcpy(reinterpret_cast<void*>(reloc), |
| 1064 | reinterpret_cast<void*>(src->st_value + lsi->load_bias), src->st_size); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1065 | } else { |
| 1066 | DL_ERR("%s R_AARCH64_COPY relocation target cannot be resolved", si->name); |
| 1067 | return -1; |
| 1068 | } |
| 1069 | break; |
| 1070 | case R_AARCH64_TLS_TPREL64: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1071 | TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16llx <- %16llx - %16llx\n", |
| 1072 | reloc, (sym_addr + rela->r_addend), rela->r_offset); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1073 | break; |
| 1074 | case R_AARCH64_TLS_DTPREL32: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1075 | TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16llx <- %16llx - %16llx\n", |
| 1076 | reloc, (sym_addr + rela->r_addend), rela->r_offset); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1077 | break; |
| 1078 | #elif defined(__x86_64__) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1079 | case R_X86_64_JUMP_SLOT: |
| 1080 | count_relocation(kRelocAbsolute); |
| 1081 | MARK(rela->r_offset); |
| 1082 | TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), |
| 1083 | static_cast<size_t>(sym_addr + rela->r_addend), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1084 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1085 | break; |
| 1086 | case R_X86_64_GLOB_DAT: |
| 1087 | count_relocation(kRelocAbsolute); |
| 1088 | MARK(rela->r_offset); |
| 1089 | TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), |
| 1090 | static_cast<size_t>(sym_addr + rela->r_addend), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1091 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1092 | break; |
| 1093 | case R_X86_64_RELATIVE: |
| 1094 | count_relocation(kRelocRelative); |
| 1095 | MARK(rela->r_offset); |
| 1096 | if (sym) { |
| 1097 | DL_ERR("odd RELATIVE form..."); |
| 1098 | return -1; |
| 1099 | } |
| 1100 | TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), |
| 1101 | static_cast<size_t>(si->base)); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1102 | *reinterpret_cast<ElfW(Addr)*>(reloc) = si->base + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1103 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1104 | case R_X86_64_32: |
| 1105 | count_relocation(kRelocRelative); |
| 1106 | MARK(rela->r_offset); |
| 1107 | TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), |
| 1108 | static_cast<size_t>(sym_addr), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1109 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1110 | break; |
Pavel Chupin | c075c18 | 2013-10-16 19:13:58 +0400 | [diff] [blame] | 1111 | case R_X86_64_64: |
| 1112 | count_relocation(kRelocRelative); |
| 1113 | MARK(rela->r_offset); |
| 1114 | TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), |
| 1115 | static_cast<size_t>(sym_addr), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1116 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Pavel Chupin | c075c18 | 2013-10-16 19:13:58 +0400 | [diff] [blame] | 1117 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1118 | case R_X86_64_PC32: |
| 1119 | count_relocation(kRelocRelative); |
| 1120 | MARK(rela->r_offset); |
| 1121 | TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", |
| 1122 | static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), |
| 1123 | static_cast<size_t>(sym_addr), static_cast<size_t>(reloc), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1124 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend - reloc; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1125 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1126 | #endif |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1127 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1128 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1129 | DL_ERR("unknown reloc type %d @ %p (%zu)", type, rela, idx); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1130 | return -1; |
| 1131 | } |
| 1132 | } |
| 1133 | return 0; |
| 1134 | } |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1135 | |
| 1136 | #else // REL, not RELA. |
| 1137 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1138 | static int soinfo_relocate(soinfo* si, ElfW(Rel)* rel, unsigned count, soinfo* needed[]) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1139 | ElfW(Sym)* s; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1140 | soinfo* lsi; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1141 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1142 | for (size_t idx = 0; idx < count; ++idx, ++rel) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1143 | unsigned type = ELFW(R_TYPE)(rel->r_info); |
| 1144 | // TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead. |
| 1145 | unsigned sym = ELFW(R_SYM)(rel->r_info); |
| 1146 | ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + si->load_bias); |
| 1147 | ElfW(Addr) sym_addr = 0; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1148 | const char* sym_name = NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1149 | |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1150 | DEBUG("Processing '%s' relocation at index %zd", si->name, idx); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1151 | if (type == 0) { // R_*_NONE |
| 1152 | continue; |
| 1153 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1154 | if (sym != 0) { |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 1155 | sym_name = reinterpret_cast<const char*>(si->strtab + si->symtab[sym].st_name); |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1156 | s = soinfo_do_lookup(si, sym_name, &lsi, needed); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1157 | if (s == NULL) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1158 | // We only allow an undefined symbol if this is a weak reference... |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 1159 | s = &si->symtab[sym]; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1160 | if (ELF_ST_BIND(s->st_info) != STB_WEAK) { |
Elliott Hughes | e9b6fc6 | 2012-08-29 13:10:54 -0700 | [diff] [blame] | 1161 | DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1162 | return -1; |
| 1163 | } |
| 1164 | |
| 1165 | /* IHI0044C AAELF 4.5.1.1: |
| 1166 | |
| 1167 | Libraries are not searched to resolve weak references. |
| 1168 | It is not an error for a weak reference to remain |
| 1169 | unsatisfied. |
| 1170 | |
| 1171 | During linking, the value of an undefined weak reference is: |
| 1172 | - Zero if the relocation type is absolute |
| 1173 | - The address of the place if the relocation is pc-relative |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1174 | - The address of nominal base address if the relocation |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1175 | type is base-relative. |
| 1176 | */ |
| 1177 | |
| 1178 | switch (type) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1179 | #if defined(__arm__) |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1180 | case R_ARM_JUMP_SLOT: |
| 1181 | case R_ARM_GLOB_DAT: |
| 1182 | case R_ARM_ABS32: |
| 1183 | case R_ARM_RELATIVE: /* Don't care. */ |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1184 | // sym_addr was initialized to be zero above or relocation |
| 1185 | // code below does not care about value of sym_addr. |
| 1186 | // No need to do anything. |
| 1187 | break; |
| 1188 | #elif defined(__i386__) |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1189 | case R_386_JMP_SLOT: |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1190 | case R_386_GLOB_DAT: |
| 1191 | case R_386_32: |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1192 | case R_386_RELATIVE: /* Don't care. */ |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1193 | // sym_addr was initialized to be zero above or relocation |
| 1194 | // code below does not care about value of sym_addr. |
| 1195 | // No need to do anything. |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1196 | break; |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1197 | case R_386_PC32: |
| 1198 | sym_addr = reloc; |
| 1199 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1200 | #endif |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1201 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1202 | #if defined(__arm__) |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1203 | case R_ARM_COPY: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1204 | // Fall through. Can't really copy if weak symbol is not found at run-time. |
| 1205 | #endif |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1206 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1207 | DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rel, idx); |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1208 | return -1; |
| 1209 | } |
| 1210 | } else { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1211 | // We got a definition. |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1212 | sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1213 | } |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1214 | count_relocation(kRelocSymbol); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1215 | } else { |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1216 | s = NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1217 | } |
| 1218 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1219 | switch (type) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1220 | #if defined(__arm__) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1221 | case R_ARM_JUMP_SLOT: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1222 | count_relocation(kRelocAbsolute); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1223 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1224 | TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1225 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1226 | break; |
| 1227 | case R_ARM_GLOB_DAT: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1228 | count_relocation(kRelocAbsolute); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1229 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1230 | TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1231 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1232 | break; |
| 1233 | case R_ARM_ABS32: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1234 | count_relocation(kRelocAbsolute); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1235 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1236 | TRACE_TYPE(RELO, "RELO ABS %08x <- %08x %s", reloc, sym_addr, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1237 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1238 | break; |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1239 | case R_ARM_REL32: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1240 | count_relocation(kRelocRelative); |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1241 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1242 | TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1243 | reloc, sym_addr, rel->r_offset, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1244 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr - rel->r_offset; |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1245 | break; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1246 | case R_ARM_COPY: |
Nick Kralevich | d39c3ab | 2012-08-24 13:25:51 -0700 | [diff] [blame] | 1247 | if ((si->flags & FLAG_EXE) == 0) { |
| 1248 | /* |
| 1249 | * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf |
| 1250 | * |
| 1251 | * Section 4.7.1.10 "Dynamic relocations" |
| 1252 | * R_ARM_COPY may only appear in executable objects where e_type is |
| 1253 | * set to ET_EXEC. |
| 1254 | * |
| 1255 | * TODO: FLAG_EXE is set for both ET_DYN and ET_EXEC executables. |
| 1256 | * We should explicitly disallow ET_DYN executables from having |
| 1257 | * R_ARM_COPY relocations. |
| 1258 | */ |
| 1259 | DL_ERR("%s R_ARM_COPY relocations only supported for ET_EXEC", si->name); |
| 1260 | return -1; |
| 1261 | } |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1262 | count_relocation(kRelocCopy); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1263 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1264 | TRACE_TYPE(RELO, "RELO %08x <- %d @ %08x %s", reloc, s->st_size, sym_addr, sym_name); |
Nick Kralevich | d39c3ab | 2012-08-24 13:25:51 -0700 | [diff] [blame] | 1265 | if (reloc == sym_addr) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1266 | ElfW(Sym)* src = soinfo_do_lookup(NULL, sym_name, &lsi, needed); |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1267 | |
| 1268 | if (src == NULL) { |
| 1269 | DL_ERR("%s R_ARM_COPY relocation source cannot be resolved", si->name); |
| 1270 | return -1; |
| 1271 | } |
| 1272 | if (lsi->has_DT_SYMBOLIC) { |
| 1273 | DL_ERR("%s invalid R_ARM_COPY relocation against DT_SYMBOLIC shared " |
| 1274 | "library %s (built with -Bsymbolic?)", si->name, lsi->name); |
| 1275 | return -1; |
| 1276 | } |
| 1277 | if (s->st_size < src->st_size) { |
| 1278 | DL_ERR("%s R_ARM_COPY relocation size mismatch (%d < %d)", |
| 1279 | si->name, s->st_size, src->st_size); |
| 1280 | return -1; |
| 1281 | } |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1282 | memcpy(reinterpret_cast<void*>(reloc), |
| 1283 | reinterpret_cast<void*>(src->st_value + lsi->load_bias), src->st_size); |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1284 | } else { |
| 1285 | DL_ERR("%s R_ARM_COPY relocation target cannot be resolved", si->name); |
Nick Kralevich | d39c3ab | 2012-08-24 13:25:51 -0700 | [diff] [blame] | 1286 | return -1; |
| 1287 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1288 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1289 | #elif defined(__i386__) |
| 1290 | case R_386_JMP_SLOT: |
| 1291 | count_relocation(kRelocAbsolute); |
| 1292 | MARK(rel->r_offset); |
| 1293 | TRACE_TYPE(RELO, "RELO JMP_SLOT %08x <- %08x %s", reloc, sym_addr, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1294 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1295 | break; |
| 1296 | case R_386_GLOB_DAT: |
| 1297 | count_relocation(kRelocAbsolute); |
| 1298 | MARK(rel->r_offset); |
| 1299 | TRACE_TYPE(RELO, "RELO GLOB_DAT %08x <- %08x %s", reloc, sym_addr, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1300 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1301 | break; |
| 1302 | case R_386_32: |
| 1303 | count_relocation(kRelocRelative); |
| 1304 | MARK(rel->r_offset); |
| 1305 | TRACE_TYPE(RELO, "RELO R_386_32 %08x <- +%08x %s", reloc, sym_addr, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1306 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1307 | break; |
| 1308 | case R_386_PC32: |
| 1309 | count_relocation(kRelocRelative); |
| 1310 | MARK(rel->r_offset); |
| 1311 | TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", |
| 1312 | reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1313 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr - reloc); |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1314 | break; |
| 1315 | #elif defined(__mips__) |
| 1316 | case R_MIPS_REL32: |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1317 | #if defined(__LP64__) |
| 1318 | // MIPS Elf64_Rel entries contain compound relocations |
| 1319 | // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case |
| 1320 | if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || |
| 1321 | ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1322 | DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)", |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1323 | type, (unsigned)ELF64_R_TYPE2(rel->r_info), |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1324 | (unsigned)ELF64_R_TYPE3(rel->r_info), rel, idx); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1325 | return -1; |
| 1326 | } |
| 1327 | #endif |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1328 | count_relocation(kRelocAbsolute); |
| 1329 | MARK(rel->r_offset); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1330 | TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), |
| 1331 | static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1332 | if (s) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1333 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1334 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1335 | *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1336 | } |
| 1337 | break; |
| 1338 | #endif |
| 1339 | |
| 1340 | #if defined(__arm__) |
| 1341 | case R_ARM_RELATIVE: |
| 1342 | #elif defined(__i386__) |
| 1343 | case R_386_RELATIVE: |
| 1344 | #endif |
| 1345 | count_relocation(kRelocRelative); |
| 1346 | MARK(rel->r_offset); |
| 1347 | if (sym) { |
| 1348 | DL_ERR("odd RELATIVE form..."); |
| 1349 | return -1; |
| 1350 | } |
| 1351 | TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", |
| 1352 | reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1353 | *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1354 | break; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1355 | |
| 1356 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1357 | DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1358 | return -1; |
| 1359 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1360 | } |
| 1361 | return 0; |
| 1362 | } |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1363 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1364 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1365 | #if defined(__mips__) |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1366 | static bool mips_relocate_got(soinfo* si, soinfo* needed[]) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1367 | ElfW(Addr)** got = si->plt_got; |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1368 | if (got == NULL) { |
| 1369 | return true; |
| 1370 | } |
| 1371 | unsigned local_gotno = si->mips_local_gotno; |
| 1372 | unsigned gotsym = si->mips_gotsym; |
| 1373 | unsigned symtabno = si->mips_symtabno; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1374 | ElfW(Sym)* symtab = si->symtab; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1375 | |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1376 | // got[0] is the address of the lazy resolver function. |
| 1377 | // got[1] may be used for a GNU extension. |
| 1378 | // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start). |
| 1379 | // FIXME: maybe this should be in a separate routine? |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1380 | if ((si->flags & FLAG_LINKER) == 0) { |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1381 | size_t g = 0; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1382 | got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef); |
| 1383 | if (reinterpret_cast<intptr_t>(got[g]) < 0) { |
| 1384 | got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1385 | } |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1386 | // Relocate the local GOT entries. |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1387 | for (; g < local_gotno; g++) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1388 | got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + si->load_bias); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1389 | } |
| 1390 | } |
| 1391 | |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1392 | // Now for the global GOT entries... |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1393 | ElfW(Sym)* sym = symtab + gotsym; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1394 | got = si->plt_got + local_gotno; |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1395 | for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1396 | // This is an undefined reference... try to locate it. |
| 1397 | const char* sym_name = si->strtab + sym->st_name; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1398 | soinfo* lsi; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1399 | ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1400 | if (s == NULL) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1401 | // We only allow an undefined symbol if this is a weak reference. |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1402 | s = &symtab[g]; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1403 | if (ELF_ST_BIND(s->st_info) != STB_WEAK) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1404 | DL_ERR("cannot locate \"%s\"...", sym_name); |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1405 | return false; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1406 | } |
| 1407 | *got = 0; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1408 | } else { |
| 1409 | // FIXME: is this sufficient? |
| 1410 | // For reference see NetBSD link loader |
| 1411 | // 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 |
| 1412 | *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1413 | } |
| 1414 | } |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1415 | return true; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1416 | } |
| 1417 | #endif |
| 1418 | |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 1419 | void soinfo::CallArray(const char* array_name __unused, linker_function_t* functions, size_t count, bool reverse) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1420 | if (functions == NULL) { |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1421 | return; |
| 1422 | } |
David 'Digit' Turner | 8215679 | 2009-05-18 14:37:41 +0200 | [diff] [blame] | 1423 | |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1424 | TRACE("[ Calling %s (size %zd) @ %p for '%s' ]", array_name, count, functions, name); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1425 | |
| 1426 | int begin = reverse ? (count - 1) : 0; |
| 1427 | int end = reverse ? -1 : count; |
| 1428 | int step = reverse ? -1 : 1; |
| 1429 | |
| 1430 | for (int i = begin; i != end; i += step) { |
| 1431 | TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); |
| 1432 | CallFunction("function", functions[i]); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1433 | } |
David 'Digit' Turner | 8215679 | 2009-05-18 14:37:41 +0200 | [diff] [blame] | 1434 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1435 | TRACE("[ Done calling %s for '%s' ]", array_name, name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1436 | } |
| 1437 | |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 1438 | void soinfo::CallFunction(const char* function_name __unused, linker_function_t function) { |
Elliott Hughes | db492b3 | 2013-01-03 15:44:03 -0800 | [diff] [blame] | 1439 | if (function == NULL || reinterpret_cast<uintptr_t>(function) == static_cast<uintptr_t>(-1)) { |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1440 | return; |
| 1441 | } |
| 1442 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1443 | TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1444 | function(); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1445 | TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); |
Elliott Hughes | db492b3 | 2013-01-03 15:44:03 -0800 | [diff] [blame] | 1446 | |
| 1447 | // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures |
| 1448 | // are still writable. This happens with our debug malloc (see http://b/7941716). |
| 1449 | set_soinfo_pool_protection(PROT_READ | PROT_WRITE); |
Evgeniy Stepanov | 9181a5d | 2012-08-13 17:58:37 +0400 | [diff] [blame] | 1450 | } |
| 1451 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1452 | void soinfo::CallPreInitConstructors() { |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1453 | // DT_PREINIT_ARRAY functions are called before any other constructors for executables, |
| 1454 | // but ignored in a shared library. |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1455 | CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); |
| 1456 | } |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 1457 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1458 | void soinfo::CallConstructors() { |
| 1459 | if (constructors_called) { |
| 1460 | return; |
| 1461 | } |
Jesse Hall | f5d1693 | 2012-01-30 15:39:57 -0800 | [diff] [blame] | 1462 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1463 | // We set constructors_called before actually calling the constructors, otherwise it doesn't |
| 1464 | // protect against recursive constructor calls. One simple example of constructor recursion |
| 1465 | // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: |
| 1466 | // 1. The program depends on libc, so libc's constructor is called here. |
| 1467 | // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. |
| 1468 | // 3. dlopen() calls the constructors on the newly created |
| 1469 | // soinfo for libc_malloc_debug_leak.so. |
| 1470 | // 4. The debug .so depends on libc, so CallConstructors is |
| 1471 | // called again with the libc soinfo. If it doesn't trigger the early- |
| 1472 | // out above, the libc constructor will be called again (recursively!). |
| 1473 | constructors_called = true; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1474 | |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1475 | if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { |
| 1476 | // The GNU dynamic linker silently ignores these, but we warn the developer. |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1477 | PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1478 | name, preinit_array_count); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1479 | } |
| 1480 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1481 | if (dynamic != NULL) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1482 | for (ElfW(Dyn)* d = dynamic; d->d_tag != DT_NULL; ++d) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1483 | if (d->d_tag == DT_NEEDED) { |
| 1484 | const char* library_name = strtab + d->d_un.d_val; |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1485 | TRACE("\"%s\": calling constructors in DT_NEEDED \"%s\"", name, library_name); |
| 1486 | find_loaded_library(library_name)->CallConstructors(); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1487 | } |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 1488 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1489 | } |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 1490 | |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1491 | TRACE("\"%s\": calling constructors", name); |
| 1492 | |
| 1493 | // DT_INIT should be called before DT_INIT_ARRAY if both are present. |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1494 | CallFunction("DT_INIT", init_func); |
| 1495 | CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 1496 | } |
David 'Digit' Turner | 8215679 | 2009-05-18 14:37:41 +0200 | [diff] [blame] | 1497 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1498 | void soinfo::CallDestructors() { |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1499 | TRACE("\"%s\": calling destructors", name); |
| 1500 | |
| 1501 | // DT_FINI_ARRAY must be parsed in reverse order. |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1502 | CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1503 | |
| 1504 | // DT_FINI should be called after DT_FINI_ARRAY if both are present. |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1505 | CallFunction("DT_FINI", fini_func); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1506 | } |
| 1507 | |
| 1508 | /* Force any of the closed stdin, stdout and stderr to be associated with |
| 1509 | /dev/null. */ |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 1510 | static int nullify_closed_stdio() { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1511 | int dev_null, i, status; |
| 1512 | int return_value = 0; |
| 1513 | |
David 'Digit' Turner | 1608416 | 2012-06-12 16:25:37 +0200 | [diff] [blame] | 1514 | dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1515 | if (dev_null < 0) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1516 | DL_ERR("cannot open /dev/null: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1517 | return -1; |
| 1518 | } |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1519 | TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1520 | |
| 1521 | /* If any of the stdio file descriptors is valid and not associated |
| 1522 | with /dev/null, dup /dev/null to it. */ |
| 1523 | for (i = 0; i < 3; i++) { |
| 1524 | /* If it is /dev/null already, we are done. */ |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1525 | if (i == dev_null) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1526 | continue; |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1527 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1528 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1529 | TRACE("[ Nullifying stdio file descriptor %d]", i); |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1530 | status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1531 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1532 | /* If file is opened, we are good. */ |
| 1533 | if (status != -1) { |
| 1534 | continue; |
| 1535 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1536 | |
| 1537 | /* The only error we allow is that the file descriptor does not |
| 1538 | exist, in which case we dup /dev/null to it. */ |
| 1539 | if (errno != EBADF) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1540 | DL_ERR("fcntl failed: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1541 | return_value = -1; |
| 1542 | continue; |
| 1543 | } |
| 1544 | |
| 1545 | /* Try dupping /dev/null to this stdio file descriptor and |
| 1546 | repeat if there is a signal. Note that any errors in closing |
| 1547 | the stdio descriptor are lost. */ |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1548 | status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1549 | if (status < 0) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1550 | DL_ERR("dup2 failed: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1551 | return_value = -1; |
| 1552 | continue; |
| 1553 | } |
| 1554 | } |
| 1555 | |
| 1556 | /* If /dev/null is not one of the stdio file descriptors, close it. */ |
| 1557 | if (dev_null > 2) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1558 | TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1559 | status = TEMP_FAILURE_RETRY(close(dev_null)); |
| 1560 | if (status == -1) { |
| 1561 | DL_ERR("close failed: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1562 | return_value = -1; |
| 1563 | } |
| 1564 | } |
| 1565 | |
| 1566 | return return_value; |
| 1567 | } |
| 1568 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 1569 | static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo) { |
Ji-Hwan Lee | f186a18 | 2012-05-31 20:20:36 +0900 | [diff] [blame] | 1570 | /* "base" might wrap around UINT32_MAX. */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1571 | ElfW(Addr) base = si->load_bias; |
| 1572 | const ElfW(Phdr)* phdr = si->phdr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1573 | int phnum = si->phnum; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1574 | bool relocating_linker = (si->flags & FLAG_LINKER) != 0; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1575 | |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1576 | /* We can't debug anything until the linker is relocated */ |
| 1577 | if (!relocating_linker) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1578 | INFO("[ linking %s ]", si->name); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1579 | DEBUG("si->base = %p si->flags = 0x%08x", reinterpret_cast<void*>(si->base), si->flags); |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1580 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1581 | |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1582 | /* Extract dynamic section */ |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1583 | size_t dynamic_count; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1584 | ElfW(Word) dynamic_flags; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1585 | phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, |
Chris Dearman | cf23905 | 2013-01-11 15:32:20 -0800 | [diff] [blame] | 1586 | &dynamic_count, &dynamic_flags); |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1587 | if (si->dynamic == NULL) { |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1588 | if (!relocating_linker) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1589 | DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1590 | } |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1591 | return false; |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1592 | } else { |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1593 | if (!relocating_linker) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1594 | DEBUG("dynamic = %p", si->dynamic); |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1595 | } |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1596 | } |
| 1597 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1598 | #if defined(__arm__) |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1599 | (void) phdr_table_get_arm_exidx(phdr, phnum, base, |
| 1600 | &si->ARM_exidx, &si->ARM_exidx_count); |
| 1601 | #endif |
| 1602 | |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1603 | // Extract useful information from dynamic section. |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1604 | uint32_t needed_count = 0; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1605 | for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1606 | DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", |
| 1607 | d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); |
| 1608 | switch (d->d_tag) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1609 | case DT_HASH: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1610 | si->nbucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[0]; |
| 1611 | si->nchain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[1]; |
| 1612 | si->bucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8); |
| 1613 | si->chain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8 + si->nbucket * 4); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1614 | break; |
| 1615 | case DT_STRTAB: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1616 | si->strtab = reinterpret_cast<const char*>(base + d->d_un.d_ptr); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1617 | break; |
| 1618 | case DT_SYMTAB: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1619 | si->symtab = reinterpret_cast<ElfW(Sym)*>(base + d->d_un.d_ptr); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1620 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1621 | #if !defined(__LP64__) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1622 | case DT_PLTREL: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1623 | if (d->d_un.d_val != DT_REL) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1624 | DL_ERR("unsupported DT_RELA in \"%s\"", si->name); |
| 1625 | return false; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1626 | } |
| 1627 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1628 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1629 | case DT_JMPREL: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1630 | #if defined(USE_RELA) |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1631 | si->plt_rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1632 | #else |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1633 | si->plt_rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1634 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1635 | break; |
| 1636 | case DT_PLTRELSZ: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1637 | #if defined(USE_RELA) |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1638 | si->plt_rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1639 | #else |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1640 | si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1641 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1642 | break; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1643 | #if defined(__mips__) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1644 | case DT_PLTGOT: |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1645 | // Used by mips and mips64. |
| 1646 | si->plt_got = reinterpret_cast<ElfW(Addr)**>(base + d->d_un.d_ptr); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1647 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1648 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1649 | case DT_DEBUG: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1650 | // Set the DT_DEBUG entry to the address of _r_debug for GDB |
Chris Dearman | cf23905 | 2013-01-11 15:32:20 -0800 | [diff] [blame] | 1651 | // if the dynamic table is writable |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1652 | // FIXME: not working currently for N64 |
| 1653 | // The flags for the LOAD and DYNAMIC program headers do not agree. |
| 1654 | // The LOAD section containng the dynamic table has been mapped as |
| 1655 | // read-only, but the DYNAMIC header claims it is writable. |
| 1656 | #if !(defined(__mips__) && defined(__LP64__)) |
Elliott Hughes | 99c3205 | 2013-01-14 09:56:21 -0800 | [diff] [blame] | 1657 | if ((dynamic_flags & PF_W) != 0) { |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1658 | d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); |
Elliott Hughes | 99c3205 | 2013-01-14 09:56:21 -0800 | [diff] [blame] | 1659 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1660 | break; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1661 | #endif |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1662 | #if defined(USE_RELA) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1663 | case DT_RELA: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1664 | si->rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1665 | break; |
| 1666 | case DT_RELASZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1667 | si->rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1668 | break; |
| 1669 | case DT_REL: |
| 1670 | DL_ERR("unsupported DT_REL in \"%s\"", si->name); |
| 1671 | return false; |
| 1672 | case DT_RELSZ: |
| 1673 | DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); |
| 1674 | return false; |
| 1675 | #else |
| 1676 | case DT_REL: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1677 | si->rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1678 | break; |
| 1679 | case DT_RELSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1680 | si->rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1681 | break; |
Shin-ichiro KAWASAKI | ad13c57 | 2009-11-06 10:36:37 +0900 | [diff] [blame] | 1682 | case DT_RELA: |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1683 | DL_ERR("unsupported DT_RELA in \"%s\"", si->name); |
| 1684 | return false; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1685 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1686 | case DT_INIT: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1687 | si->init_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1688 | DEBUG("%s constructors (DT_INIT) found at %p", si->name, si->init_func); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1689 | break; |
| 1690 | case DT_FINI: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1691 | si->fini_func = reinterpret_cast<linker_function_t>(base + d->d_un.d_ptr); |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1692 | DEBUG("%s destructors (DT_FINI) found at %p", si->name, si->fini_func); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1693 | break; |
| 1694 | case DT_INIT_ARRAY: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1695 | si->init_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1696 | DEBUG("%s constructors (DT_INIT_ARRAY) found at %p", si->name, si->init_array); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1697 | break; |
| 1698 | case DT_INIT_ARRAYSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1699 | si->init_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1700 | break; |
| 1701 | case DT_FINI_ARRAY: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1702 | si->fini_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1703 | DEBUG("%s destructors (DT_FINI_ARRAY) found at %p", si->name, si->fini_array); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1704 | break; |
| 1705 | case DT_FINI_ARRAYSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1706 | si->fini_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1707 | break; |
| 1708 | case DT_PREINIT_ARRAY: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1709 | si->preinit_array = reinterpret_cast<linker_function_t*>(base + d->d_un.d_ptr); |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1710 | DEBUG("%s constructors (DT_PREINIT_ARRAY) found at %p", si->name, si->preinit_array); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1711 | break; |
| 1712 | case DT_PREINIT_ARRAYSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1713 | si->preinit_array_count = ((unsigned)d->d_un.d_val) / sizeof(ElfW(Addr)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1714 | break; |
| 1715 | case DT_TEXTREL: |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1716 | #if defined(__LP64__) |
| 1717 | DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); |
| 1718 | return false; |
| 1719 | #else |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1720 | si->has_text_relocations = true; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1721 | break; |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1722 | #endif |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1723 | case DT_SYMBOLIC: |
| 1724 | si->has_DT_SYMBOLIC = true; |
| 1725 | break; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1726 | case DT_NEEDED: |
| 1727 | ++needed_count; |
| 1728 | break; |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1729 | case DT_FLAGS: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1730 | if (d->d_un.d_val & DF_TEXTREL) { |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1731 | #if defined(__LP64__) |
| 1732 | DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); |
| 1733 | return false; |
| 1734 | #else |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1735 | si->has_text_relocations = true; |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1736 | #endif |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1737 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1738 | if (d->d_un.d_val & DF_SYMBOLIC) { |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1739 | si->has_DT_SYMBOLIC = true; |
| 1740 | } |
| 1741 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1742 | #if defined(__mips__) |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1743 | case DT_STRSZ: |
| 1744 | case DT_SYMENT: |
| 1745 | case DT_RELENT: |
| 1746 | break; |
| 1747 | case DT_MIPS_RLD_MAP: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1748 | // Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB. |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1749 | { |
Benjamin Adolphi | 006f9ad | 2014-02-19 00:50:32 +0100 | [diff] [blame] | 1750 | r_debug** dp = reinterpret_cast<r_debug**>(base + d->d_un.d_ptr); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1751 | *dp = &_r_debug; |
| 1752 | } |
| 1753 | break; |
| 1754 | case DT_MIPS_RLD_VERSION: |
| 1755 | case DT_MIPS_FLAGS: |
| 1756 | case DT_MIPS_BASE_ADDRESS: |
| 1757 | case DT_MIPS_UNREFEXTNO: |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1758 | break; |
| 1759 | |
| 1760 | case DT_MIPS_SYMTABNO: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1761 | si->mips_symtabno = d->d_un.d_val; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1762 | break; |
| 1763 | |
| 1764 | case DT_MIPS_LOCAL_GOTNO: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1765 | si->mips_local_gotno = d->d_un.d_val; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1766 | break; |
| 1767 | |
| 1768 | case DT_MIPS_GOTSYM: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1769 | si->mips_gotsym = d->d_un.d_val; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1770 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1771 | #endif |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1772 | |
| 1773 | default: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1774 | DEBUG("Unused DT entry: type %p arg %p", |
| 1775 | reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1776 | break; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1777 | } |
| 1778 | } |
| 1779 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1780 | DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", |
| 1781 | reinterpret_cast<void*>(si->base), si->strtab, si->symtab); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1782 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1783 | // Sanity checks. |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1784 | if (relocating_linker && needed_count != 0) { |
| 1785 | DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); |
| 1786 | return false; |
| 1787 | } |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1788 | if (si->nbucket == 0) { |
| 1789 | DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); |
| 1790 | return false; |
| 1791 | } |
| 1792 | if (si->strtab == 0) { |
| 1793 | DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); |
| 1794 | return false; |
| 1795 | } |
| 1796 | if (si->symtab == 0) { |
| 1797 | DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); |
| 1798 | return false; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1799 | } |
| 1800 | |
Elliott Hughes | 7e5a8cc | 2013-06-18 13:15:00 -0700 | [diff] [blame] | 1801 | // If this is the main executable, then load all of the libraries from LD_PRELOAD now. |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1802 | if (si->flags & FLAG_EXE) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1803 | memset(gLdPreloads, 0, sizeof(gLdPreloads)); |
Elliott Hughes | 7e5a8cc | 2013-06-18 13:15:00 -0700 | [diff] [blame] | 1804 | size_t preload_count = 0; |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1805 | for (size_t i = 0; gLdPreloadNames[i] != NULL; i++) { |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 1806 | soinfo* lsi = find_library(gLdPreloadNames[i], NULL); |
Elliott Hughes | 7e5a8cc | 2013-06-18 13:15:00 -0700 | [diff] [blame] | 1807 | if (lsi != NULL) { |
| 1808 | gLdPreloads[preload_count++] = lsi; |
| 1809 | } else { |
| 1810 | // As with glibc, failure to load an LD_PRELOAD library is just a warning. |
| 1811 | DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", |
| 1812 | gLdPreloadNames[i], si->name, linker_get_error_buffer()); |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 1813 | } |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 1814 | } |
| 1815 | } |
| 1816 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1817 | soinfo** needed = reinterpret_cast<soinfo**>(alloca((1 + needed_count) * sizeof(soinfo*))); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1818 | soinfo** pneeded = needed; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1819 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1820 | for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1821 | if (d->d_tag == DT_NEEDED) { |
| 1822 | const char* library_name = si->strtab + d->d_un.d_val; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1823 | DEBUG("%s needs %s", si->name, library_name); |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 1824 | soinfo* lsi = find_library(library_name, NULL); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1825 | if (lsi == NULL) { |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 1826 | strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1827 | DL_ERR("could not load library \"%s\" needed by \"%s\"; caused by %s", |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1828 | library_name, si->name, tmp_err_buf); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1829 | return false; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1830 | } |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1831 | *pneeded++ = lsi; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1832 | } |
| 1833 | } |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1834 | *pneeded = NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1835 | |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1836 | #if !defined(__LP64__) |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1837 | if (si->has_text_relocations) { |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1838 | // Make segments writable to allow text relocations to work properly. We will later call |
| 1839 | // phdr_table_protect_segments() after all of them are applied and all constructors are run. |
Du Chenyang | 865119e | 2014-04-18 19:17:40 +0800 | [diff] [blame] | 1840 | #if !defined(__i386__) // The platform itself has too many text relocations on x86. |
Nick Kralevich | 3d4470c | 2013-10-22 12:06:36 -0700 | [diff] [blame] | 1841 | DL_WARN("%s has text relocations. This is wasting memory and prevents " |
| 1842 | "security hardening. Please fix.", si->name); |
Du Chenyang | 865119e | 2014-04-18 19:17:40 +0800 | [diff] [blame] | 1843 | #endif |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1844 | if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { |
| 1845 | DL_ERR("can't unprotect loadable segments for \"%s\": %s", |
| 1846 | si->name, strerror(errno)); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1847 | return false; |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1848 | } |
| 1849 | } |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1850 | #endif |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1851 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1852 | #if defined(USE_RELA) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1853 | if (si->plt_rela != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1854 | DEBUG("[ relocating %s plt ]\n", si->name); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1855 | if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1856 | return false; |
| 1857 | } |
| 1858 | } |
| 1859 | if (si->rela != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1860 | DEBUG("[ relocating %s ]\n", si->name); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1861 | if (soinfo_relocate(si, si->rela, si->rela_count, needed)) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1862 | return false; |
| 1863 | } |
| 1864 | } |
| 1865 | #else |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1866 | if (si->plt_rel != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1867 | DEBUG("[ relocating %s plt ]", si->name); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1868 | if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1869 | return false; |
| 1870 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1871 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1872 | if (si->rel != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1873 | DEBUG("[ relocating %s ]", si->name); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1874 | if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1875 | return false; |
| 1876 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1877 | } |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1878 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1879 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1880 | #if defined(__mips__) |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1881 | if (!mips_relocate_got(si, needed)) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1882 | return false; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1883 | } |
| 1884 | #endif |
| 1885 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1886 | si->flags |= FLAG_LINKED; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1887 | DEBUG("[ finished linking %s ]", si->name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1888 | |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1889 | #if !defined(__LP64__) |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1890 | if (si->has_text_relocations) { |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1891 | // All relocations are done, we can protect our segments back to read-only. |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1892 | if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { |
| 1893 | DL_ERR("can't protect segments for \"%s\": %s", |
| 1894 | si->name, strerror(errno)); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1895 | return false; |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1896 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1897 | } |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1898 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1899 | |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1900 | /* We can also turn on GNU RELRO protection */ |
| 1901 | if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1902 | DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", |
| 1903 | si->name, strerror(errno)); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1904 | return false; |
Nick Kralevich | 9ec0f03 | 2012-02-28 10:40:00 -0800 | [diff] [blame] | 1905 | } |
| 1906 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 1907 | /* Handle serializing/sharing the RELRO segment */ |
| 1908 | if (extinfo && (extinfo->flags & ANDROID_DLEXT_WRITE_RELRO)) { |
| 1909 | if (phdr_table_serialize_gnu_relro(si->phdr, si->phnum, si->load_bias, |
| 1910 | extinfo->relro_fd) < 0) { |
| 1911 | DL_ERR("failed serializing GNU RELRO section for \"%s\": %s", |
| 1912 | si->name, strerror(errno)); |
| 1913 | return false; |
| 1914 | } |
| 1915 | } else if (extinfo && (extinfo->flags & ANDROID_DLEXT_USE_RELRO)) { |
| 1916 | if (phdr_table_map_gnu_relro(si->phdr, si->phnum, si->load_bias, |
| 1917 | extinfo->relro_fd) < 0) { |
| 1918 | DL_ERR("failed mapping GNU RELRO section for \"%s\": %s", |
| 1919 | si->name, strerror(errno)); |
| 1920 | return false; |
| 1921 | } |
| 1922 | } |
| 1923 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1924 | notify_gdb_of_load(si); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1925 | return true; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1926 | } |
| 1927 | |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 1928 | /* |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 1929 | * This function add vdso to internal dso list. |
| 1930 | * It helps to stack unwinding through signal handlers. |
| 1931 | * Also, it makes bionic more like glibc. |
| 1932 | */ |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 1933 | static void add_vdso(KernelArgumentBlock& args __unused) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1934 | #if defined(AT_SYSINFO_EHDR) |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1935 | ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(args.getauxval(AT_SYSINFO_EHDR)); |
| 1936 | if (ehdr_vdso == NULL) { |
| 1937 | return; |
| 1938 | } |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 1939 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1940 | soinfo* si = soinfo_alloc("[vdso]"); |
Sergey Melnikov | ebd506c | 2013-10-31 18:02:12 +0400 | [diff] [blame] | 1941 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1942 | si->phdr = reinterpret_cast<ElfW(Phdr)*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); |
| 1943 | si->phnum = ehdr_vdso->e_phnum; |
| 1944 | si->base = reinterpret_cast<ElfW(Addr)>(ehdr_vdso); |
| 1945 | si->size = phdr_table_get_load_size(si->phdr, si->phnum); |
| 1946 | si->flags = 0; |
| 1947 | si->load_bias = get_elf_exec_load_bias(ehdr_vdso); |
Sergey Melnikov | ebd506c | 2013-10-31 18:02:12 +0400 | [diff] [blame] | 1948 | |
Torne (Richard Coles) | 0dcf06f | 2014-04-22 11:59:26 +0100 | [diff] [blame] | 1949 | soinfo_link_image(si, NULL); |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 1950 | #endif |
| 1951 | } |
| 1952 | |
| 1953 | /* |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 1954 | * This code is called after the linker has linked itself and |
| 1955 | * fixed it's own GOT. It is safe to make references to externs |
| 1956 | * and other non-local data at this point. |
| 1957 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1958 | static ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(Addr) linker_base) { |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 1959 | /* NOTE: we store the args pointer on a special location |
David 'Digit' Turner | ef0bd18 | 2009-07-17 17:55:01 +0200 | [diff] [blame] | 1960 | * of the temporary TLS area in order to pass it to |
| 1961 | * the C Library's runtime initializer. |
| 1962 | * |
| 1963 | * The initializer must clear the slot and reset the TLS |
| 1964 | * to point to a different location to ensure that no other |
| 1965 | * shared library constructor can access it. |
| 1966 | */ |
Elliott Hughes | d3920b3 | 2013-02-07 18:39:34 -0800 | [diff] [blame] | 1967 | __libc_init_tls(args); |
Evgeniy Stepanov | 1a78fbb | 2012-03-22 18:01:53 +0400 | [diff] [blame] | 1968 | |
Evgeniy Stepanov | 1a78fbb | 2012-03-22 18:01:53 +0400 | [diff] [blame] | 1969 | #if TIMING |
| 1970 | struct timeval t0, t1; |
| 1971 | gettimeofday(&t0, 0); |
| 1972 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1973 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 1974 | // Initialize environment functions, and get to the ELF aux vectors table. |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 1975 | linker_env_init(args); |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 1976 | |
Nick Kralevich | 8d3e91d | 2013-04-25 13:15:24 -0700 | [diff] [blame] | 1977 | // If this is a setuid/setgid program, close the security hole described in |
| 1978 | // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc |
| 1979 | if (get_AT_SECURE()) { |
| 1980 | nullify_closed_stdio(); |
| 1981 | } |
| 1982 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1983 | debuggerd_init(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1984 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 1985 | // Get a few environment variables. |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 1986 | const char* LD_DEBUG = linker_env_get("LD_DEBUG"); |
| 1987 | if (LD_DEBUG != NULL) { |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 1988 | gLdDebugVerbosity = atoi(LD_DEBUG); |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 1989 | } |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 1990 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 1991 | // Normally, these are cleaned by linker_env_init, but the test |
| 1992 | // doesn't cost us anything. |
| 1993 | const char* ldpath_env = NULL; |
| 1994 | const char* ldpreload_env = NULL; |
| 1995 | if (!get_AT_SECURE()) { |
| 1996 | ldpath_env = linker_env_get("LD_LIBRARY_PATH"); |
| 1997 | ldpreload_env = linker_env_get("LD_PRELOAD"); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1998 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1999 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2000 | INFO("[ android linker & debugger ]"); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2001 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2002 | soinfo* si = soinfo_alloc(args.argv[0]); |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 2003 | if (si == NULL) { |
| 2004 | exit(EXIT_FAILURE); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2005 | } |
| 2006 | |
Nick Kralevich | d39c3ab | 2012-08-24 13:25:51 -0700 | [diff] [blame] | 2007 | /* bootstrap the link map, the main exe always needs to be first */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2008 | si->flags |= FLAG_EXE; |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 2009 | link_map* map = &(si->link_map_head); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2010 | |
| 2011 | map->l_addr = 0; |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2012 | map->l_name = args.argv[0]; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2013 | map->l_prev = NULL; |
| 2014 | map->l_next = NULL; |
| 2015 | |
| 2016 | _r_debug.r_map = map; |
| 2017 | r_debug_tail = map; |
| 2018 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2019 | /* gdb expects the linker to be in the debug shared object list. |
| 2020 | * Without this, gdb has trouble locating the linker's ".text" |
| 2021 | * and ".plt" sections. Gdb could also potentially use this to |
| 2022 | * relocate the offset of our exported 'rtld_db_dlactivity' symbol. |
| 2023 | * Don't use soinfo_alloc(), because the linker shouldn't |
| 2024 | * be on the soinfo list. |
Ben Cheng | 06f0e74 | 2012-08-10 16:07:02 -0700 | [diff] [blame] | 2025 | */ |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2026 | { |
| 2027 | static soinfo linker_soinfo; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 2028 | #if defined(__LP64__) |
Pavel Chupin | 1a57f9f | 2013-02-06 19:21:46 +0400 | [diff] [blame] | 2029 | strlcpy(linker_soinfo.name, "/system/bin/linker64", sizeof(linker_soinfo.name)); |
| 2030 | #else |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2031 | strlcpy(linker_soinfo.name, "/system/bin/linker", sizeof(linker_soinfo.name)); |
Pavel Chupin | 1a57f9f | 2013-02-06 19:21:46 +0400 | [diff] [blame] | 2032 | #endif |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2033 | linker_soinfo.flags = 0; |
| 2034 | linker_soinfo.base = linker_base; |
| 2035 | |
| 2036 | /* |
| 2037 | * Set the dynamic field in the link map otherwise gdb will complain with |
| 2038 | * the following: |
| 2039 | * warning: .dynamic section for "/system/bin/linker" is not at the |
| 2040 | * expected address (wrong library or version mismatch?) |
| 2041 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2042 | ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_base); |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2043 | ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_base + elf_hdr->e_phoff); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2044 | phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, |
| 2045 | &linker_soinfo.dynamic, NULL, NULL); |
| 2046 | insert_soinfo_into_debug_map(&linker_soinfo); |
| 2047 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2048 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2049 | // Extract information passed from the kernel. |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2050 | si->phdr = reinterpret_cast<ElfW(Phdr)*>(args.getauxval(AT_PHDR)); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2051 | si->phnum = args.getauxval(AT_PHNUM); |
| 2052 | si->entry = args.getauxval(AT_ENTRY); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2053 | |
David 'Digit' Turner | 8180b08 | 2011-11-15 17:17:28 +0100 | [diff] [blame] | 2054 | /* Compute the value of si->base. We can't rely on the fact that |
| 2055 | * the first entry is the PHDR because this will not be true |
| 2056 | * for certain executables (e.g. some in the NDK unit test suite) |
| 2057 | */ |
David 'Digit' Turner | 8180b08 | 2011-11-15 17:17:28 +0100 | [diff] [blame] | 2058 | si->base = 0; |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 2059 | si->size = phdr_table_get_load_size(si->phdr, si->phnum); |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2060 | si->load_bias = 0; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2061 | for (size_t i = 0; i < si->phnum; ++i) { |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2062 | if (si->phdr[i].p_type == PT_PHDR) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2063 | si->load_bias = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_vaddr; |
| 2064 | si->base = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_offset; |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2065 | break; |
| 2066 | } |
David 'Digit' Turner | 8180b08 | 2011-11-15 17:17:28 +0100 | [diff] [blame] | 2067 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2068 | si->dynamic = NULL; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2069 | si->ref_count = 1; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2070 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 2071 | // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). |
| 2072 | parse_LD_LIBRARY_PATH(ldpath_env); |
| 2073 | parse_LD_PRELOAD(ldpreload_env); |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 2074 | |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 2075 | somain = si; |
| 2076 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 2077 | if (!soinfo_link_image(si, NULL)) { |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 2078 | __libc_format_fd(2, "CANNOT LINK EXECUTABLE: %s\n", linker_get_error_buffer()); |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 2079 | exit(EXIT_FAILURE); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2080 | } |
| 2081 | |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 2082 | add_vdso(args); |
| 2083 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 2084 | si->CallPreInitConstructors(); |
Evgeniy Stepanov | 9181a5d | 2012-08-13 17:58:37 +0400 | [diff] [blame] | 2085 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2086 | for (size_t i = 0; gLdPreloads[i] != NULL; ++i) { |
| 2087 | gLdPreloads[i]->CallConstructors(); |
Kito Cheng | 326e85e | 2012-07-15 00:49:27 +0800 | [diff] [blame] | 2088 | } |
| 2089 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2090 | /* After the link_image, the si->load_bias is initialized. |
| 2091 | * For so lib, the map->l_addr will be updated in notify_gdb_of_load. |
| 2092 | * We need to update this value for so exe here. So Unwind_Backtrace |
| 2093 | * for some arch like x86 could work correctly within so exe. |
Xiaokang Qin | 9c3449e | 2012-09-13 18:07:24 +0800 | [diff] [blame] | 2094 | */ |
Chao-Ying Fu | c5db969 | 2012-11-15 02:00:17 -0800 | [diff] [blame] | 2095 | map->l_addr = si->load_bias; |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 2096 | si->CallConstructors(); |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 2097 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2098 | #if TIMING |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2099 | gettimeofday(&t1, NULL); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2100 | PRINT("LINKER TIME: %s: %d microseconds", args.argv[0], (int) ( |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2101 | (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2102 | (((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec))); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2103 | #endif |
| 2104 | #if STATS |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2105 | PRINT("RELO STATS: %s: %d abs, %d rel, %d copy, %d symbol", args.argv[0], |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 2106 | linker_stats.count[kRelocAbsolute], |
| 2107 | linker_stats.count[kRelocRelative], |
| 2108 | linker_stats.count[kRelocCopy], |
| 2109 | linker_stats.count[kRelocSymbol]); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2110 | #endif |
| 2111 | #if COUNT_PAGES |
| 2112 | { |
| 2113 | unsigned n; |
| 2114 | unsigned i; |
| 2115 | unsigned count = 0; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2116 | for (n = 0; n < 4096; n++) { |
| 2117 | if (bitmask[n]) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2118 | unsigned x = bitmask[n]; |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 2119 | #if defined(__LP64__) |
| 2120 | for (i = 0; i < 32; i++) { |
| 2121 | #else |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2122 | for (i = 0; i < 8; i++) { |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 2123 | #endif |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2124 | if (x & 1) { |
| 2125 | count++; |
| 2126 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2127 | x >>= 1; |
| 2128 | } |
| 2129 | } |
| 2130 | } |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2131 | PRINT("PAGES MODIFIED: %s: %d (%dKB)", args.argv[0], count, count * 4); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2132 | } |
| 2133 | #endif |
| 2134 | |
| 2135 | #if TIMING || STATS || COUNT_PAGES |
| 2136 | fflush(stdout); |
| 2137 | #endif |
| 2138 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 2139 | TRACE("[ Ready to execute '%s' @ %p ]", si->name, reinterpret_cast<void*>(si->entry)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2140 | return si->entry; |
| 2141 | } |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2142 | |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2143 | /* Compute the load-bias of an existing executable. This shall only |
| 2144 | * be used to compute the load bias of an executable or shared library |
| 2145 | * that was loaded by the kernel itself. |
| 2146 | * |
| 2147 | * Input: |
| 2148 | * elf -> address of ELF header, assumed to be at the start of the file. |
| 2149 | * Return: |
| 2150 | * load bias, i.e. add the value of any p_vaddr in the file to get |
| 2151 | * the corresponding address in memory. |
| 2152 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2153 | static ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) { |
| 2154 | ElfW(Addr) offset = elf->e_phoff; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2155 | const ElfW(Phdr)* phdr_table = reinterpret_cast<const ElfW(Phdr)*>(reinterpret_cast<uintptr_t>(elf) + offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2156 | const ElfW(Phdr)* phdr_end = phdr_table + elf->e_phnum; |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2157 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2158 | for (const ElfW(Phdr)* phdr = phdr_table; phdr < phdr_end; phdr++) { |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 2159 | if (phdr->p_type == PT_LOAD) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2160 | return reinterpret_cast<ElfW(Addr)>(elf) + phdr->p_offset - phdr->p_vaddr; |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2161 | } |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 2162 | } |
| 2163 | return 0; |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2164 | } |
| 2165 | |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2166 | /* |
| 2167 | * This is the entry point for the linker, called from begin.S. This |
| 2168 | * method is responsible for fixing the linker's own relocations, and |
| 2169 | * then calling __linker_init_post_relocation(). |
| 2170 | * |
| 2171 | * Because this method is called before the linker has fixed it's own |
| 2172 | * relocations, any attempt to reference an extern variable, extern |
| 2173 | * function, or other GOT reference will generate a segfault. |
| 2174 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2175 | extern "C" ElfW(Addr) __linker_init(void* raw_args) { |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2176 | KernelArgumentBlock args(raw_args); |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2177 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2178 | ElfW(Addr) linker_addr = args.getauxval(AT_BASE); |
| 2179 | ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr); |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2180 | ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_addr + elf_hdr->e_phoff); |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2181 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2182 | soinfo linker_so; |
| 2183 | memset(&linker_so, 0, sizeof(soinfo)); |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2184 | |
Elliott Hughes | b93702a | 2013-12-21 16:07:45 -0800 | [diff] [blame] | 2185 | strcpy(linker_so.name, "[dynamic linker]"); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2186 | linker_so.base = linker_addr; |
| 2187 | linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); |
| 2188 | linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2189 | linker_so.dynamic = NULL; |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2190 | linker_so.phdr = phdr; |
| 2191 | linker_so.phnum = elf_hdr->e_phnum; |
| 2192 | linker_so.flags |= FLAG_LINKER; |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 2193 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 2194 | if (!soinfo_link_image(&linker_so, NULL)) { |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2195 | // It would be nice to print an error message, but if the linker |
| 2196 | // can't link itself, there's no guarantee that we'll be able to |
Elliott Hughes | b93702a | 2013-12-21 16:07:45 -0800 | [diff] [blame] | 2197 | // call write() (because it involves a GOT reference). We may as |
| 2198 | // well try though... |
| 2199 | const char* msg = "CANNOT LINK EXECUTABLE: "; |
| 2200 | write(2, msg, strlen(msg)); |
| 2201 | write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); |
| 2202 | write(2, "\n", 1); |
| 2203 | _exit(EXIT_FAILURE); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2204 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 2205 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2206 | // We have successfully fixed our own relocations. It's safe to run |
| 2207 | // the main part of the linker now. |
Elliott Hughes | 0d787c1 | 2013-04-04 13:46:46 -0700 | [diff] [blame] | 2208 | args.abort_message_ptr = &gAbortMessage; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2209 | ElfW(Addr) start_address = __linker_init_post_relocation(args, linker_addr); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2210 | |
| 2211 | set_soinfo_pool_protection(PROT_READ); |
| 2212 | |
| 2213 | // Return the address that the calling assembly stub should jump to. |
| 2214 | return start_address; |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2215 | } |