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> |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 37 | #include <sys/mman.h> |
| 38 | #include <sys/stat.h> |
| 39 | #include <unistd.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 40 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 41 | // Private C library headers. |
Elliott Hughes | eb847bc | 2013-10-09 15:50:50 -0700 | [diff] [blame] | 42 | #include "private/bionic_tls.h" |
| 43 | #include "private/KernelArgumentBlock.h" |
| 44 | #include "private/ScopedPthreadMutexLocker.h" |
Dmitriy Ivanov | 04dc91a | 2014-07-01 14:10:16 -0700 | [diff] [blame] | 45 | #include "private/ScopedFd.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" |
Dmitriy Ivanov | d597d26 | 2014-05-05 16:49:04 -0700 | [diff] [blame] | 51 | #include "linker_allocator.h" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 52 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 53 | /* >>> IMPORTANT NOTE - READ ME BEFORE MODIFYING <<< |
| 54 | * |
| 55 | * Do NOT use malloc() and friends or pthread_*() code here. |
| 56 | * Don't use printf() either; it's caused mysterious memory |
| 57 | * corruption in the past. |
| 58 | * The linker runs before we bring up libc and it's easiest |
| 59 | * to make sure it does not depend on any complex libc features |
| 60 | * |
| 61 | * open issues / todo: |
| 62 | * |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 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 | |
Dmitriy Ivanov | 489e498 | 2014-05-19 15:19:52 -0700 | [diff] [blame] | 68 | #if defined(__LP64__) |
| 69 | #define SEARCH_NAME(x) x |
| 70 | #else |
| 71 | // Nvidia drivers are relying on the bug: |
| 72 | // http://code.google.com/p/android/issues/detail?id=6670 |
| 73 | // so we continue to use base-name lookup for lp32 |
| 74 | static const char* get_base_name(const char* name) { |
| 75 | const char* bname = strrchr(name, '/'); |
| 76 | return bname ? bname + 1 : name; |
| 77 | } |
| 78 | #define SEARCH_NAME(x) get_base_name(x) |
| 79 | #endif |
| 80 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 81 | static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 82 | 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] | 83 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 84 | static LinkerAllocator<soinfo> g_soinfo_allocator; |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 85 | static LinkerAllocator<LinkedListEntry<soinfo>> g_soinfo_links_allocator; |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 86 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 87 | static soinfo* solist; |
| 88 | static soinfo* sonext; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 89 | 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] | 90 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 91 | static const char* const kDefaultLdPaths[] = { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 92 | #if defined(__LP64__) |
Elliott Hughes | 011bc0b | 2013-10-08 14:27:10 -0700 | [diff] [blame] | 93 | "/vendor/lib64", |
| 94 | "/system/lib64", |
| 95 | #else |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 96 | "/vendor/lib", |
| 97 | "/system/lib", |
Elliott Hughes | 011bc0b | 2013-10-08 14:27:10 -0700 | [diff] [blame] | 98 | #endif |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 99 | NULL |
| 100 | }; |
David Bartley | bc3a5c2 | 2009-06-02 18:27:28 -0700 | [diff] [blame] | 101 | |
Elliott Hughes | a4aafd1 | 2014-01-13 16:37:47 -0800 | [diff] [blame] | 102 | #define LDPATH_BUFSIZE (LDPATH_MAX*64) |
| 103 | #define LDPATH_MAX 8 |
| 104 | |
| 105 | #define LDPRELOAD_BUFSIZE (LDPRELOAD_MAX*64) |
| 106 | #define LDPRELOAD_MAX 8 |
| 107 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 108 | static char g_ld_library_paths_buffer[LDPATH_BUFSIZE]; |
| 109 | static const char* g_ld_library_paths[LDPATH_MAX + 1]; |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 110 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 111 | static char g_ld_preloads_buffer[LDPRELOAD_BUFSIZE]; |
| 112 | static const char* g_ld_preload_names[LDPRELOAD_MAX + 1]; |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 113 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 114 | static soinfo* g_ld_preloads[LDPRELOAD_MAX + 1]; |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 115 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 116 | __LIBC_HIDDEN__ int g_ld_debug_verbosity; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 117 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 118 | __LIBC_HIDDEN__ abort_msg_t* g_abort_message = NULL; // For debuggerd. |
Elliott Hughes | 0d787c1 | 2013-04-04 13:46:46 -0700 | [diff] [blame] | 119 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 120 | enum RelocationKind { |
| 121 | kRelocAbsolute = 0, |
| 122 | kRelocRelative, |
| 123 | kRelocCopy, |
| 124 | kRelocSymbol, |
| 125 | kRelocMax |
| 126 | }; |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 127 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 128 | #if STATS |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 129 | struct linker_stats_t { |
| 130 | int count[kRelocMax]; |
| 131 | }; |
| 132 | |
| 133 | static linker_stats_t linker_stats; |
| 134 | |
| 135 | static void count_relocation(RelocationKind kind) { |
| 136 | ++linker_stats.count[kind]; |
| 137 | } |
| 138 | #else |
| 139 | static void count_relocation(RelocationKind) { |
| 140 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 141 | #endif |
| 142 | |
| 143 | #if COUNT_PAGES |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 144 | static unsigned bitmask[4096]; |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 145 | #if defined(__LP64__) |
| 146 | #define MARK(offset) \ |
| 147 | do { \ |
| 148 | if ((((offset) >> 12) >> 5) < 4096) \ |
| 149 | bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \ |
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 | #else |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 152 | #define MARK(offset) \ |
| 153 | do { \ |
| 154 | bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \ |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 155 | } while (0) |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 156 | #endif |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 157 | #else |
| 158 | #define MARK(x) do {} while (0) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 159 | #endif |
| 160 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 161 | // You shouldn't try to call memory-allocating functions in the dynamic linker. |
| 162 | // Guard against the most obvious ones. |
Elliott Hughes | 8f2a5a0 | 2013-03-15 15:30:25 -0700 | [diff] [blame] | 163 | #define DISALLOW_ALLOCATION(return_type, name, ...) \ |
| 164 | return_type name __VA_ARGS__ \ |
| 165 | { \ |
Dmitriy Ivanov | 12bf3bc | 2014-07-01 14:24:45 -0700 | [diff] [blame] | 166 | __libc_fatal("ERROR: " #name " called from the dynamic linker!\n"); \ |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 167 | } |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 168 | DISALLOW_ALLOCATION(void*, malloc, (size_t u __unused)); |
| 169 | DISALLOW_ALLOCATION(void, free, (void* u __unused)); |
| 170 | DISALLOW_ALLOCATION(void*, realloc, (void* u1 __unused, size_t u2 __unused)); |
| 171 | DISALLOW_ALLOCATION(void*, calloc, (size_t u1 __unused, size_t u2 __unused)); |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 172 | |
Dima Zavin | 0353195 | 2009-05-29 17:30:25 -0700 | [diff] [blame] | 173 | static char tmp_err_buf[768]; |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 174 | static char __linker_dl_err_buf[768]; |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 175 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 176 | char* linker_get_error_buffer() { |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 177 | return &__linker_dl_err_buf[0]; |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 180 | size_t linker_get_error_buffer_size() { |
| 181 | return sizeof(__linker_dl_err_buf); |
| 182 | } |
| 183 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 184 | /* |
| 185 | * This function is an empty stub where GDB locates a breakpoint to get notified |
| 186 | * about linker activity. |
| 187 | */ |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 188 | 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] | 189 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 190 | static pthread_mutex_t g__r_debug_mutex = PTHREAD_MUTEX_INITIALIZER; |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 191 | static r_debug _r_debug = {1, NULL, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0}; |
| 192 | static link_map* r_debug_tail = 0; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 193 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 194 | static void insert_soinfo_into_debug_map(soinfo* info) { |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 195 | // Copy the necessary fields into the debug structure. |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 196 | link_map* map = &(info->link_map_head); |
Sergey Melnikov | ebd506c | 2013-10-31 18:02:12 +0400 | [diff] [blame] | 197 | map->l_addr = info->load_bias; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 198 | map->l_name = reinterpret_cast<char*>(info->name); |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 199 | map->l_ld = info->dynamic; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 200 | |
| 201 | /* Stick the new library at the end of the list. |
| 202 | * gdb tends to care more about libc than it does |
| 203 | * about leaf libraries, and ordering it this way |
| 204 | * reduces the back-and-forth over the wire. |
| 205 | */ |
| 206 | if (r_debug_tail) { |
| 207 | r_debug_tail->l_next = map; |
| 208 | map->l_prev = r_debug_tail; |
| 209 | map->l_next = 0; |
| 210 | } else { |
| 211 | _r_debug.r_map = map; |
| 212 | map->l_prev = 0; |
| 213 | map->l_next = 0; |
| 214 | } |
| 215 | r_debug_tail = map; |
| 216 | } |
| 217 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 218 | static void remove_soinfo_from_debug_map(soinfo* info) { |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 219 | link_map* map = &(info->link_map_head); |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 220 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 221 | if (r_debug_tail == map) { |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 222 | r_debug_tail = map->l_prev; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 223 | } |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 224 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 225 | if (map->l_prev) { |
| 226 | map->l_prev->l_next = map->l_next; |
| 227 | } |
| 228 | if (map->l_next) { |
| 229 | map->l_next->l_prev = map->l_prev; |
| 230 | } |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 231 | } |
| 232 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 233 | static void notify_gdb_of_load(soinfo* info) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 234 | if (info->flags & FLAG_EXE) { |
| 235 | // GDB already knows about the main executable |
| 236 | return; |
| 237 | } |
| 238 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 239 | ScopedPthreadMutexLocker locker(&g__r_debug_mutex); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 240 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 241 | _r_debug.r_state = r_debug::RT_ADD; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 242 | rtld_db_dlactivity(); |
| 243 | |
| 244 | insert_soinfo_into_debug_map(info); |
| 245 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 246 | _r_debug.r_state = r_debug::RT_CONSISTENT; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 247 | rtld_db_dlactivity(); |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 250 | static void notify_gdb_of_unload(soinfo* info) { |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 251 | if (info->flags & FLAG_EXE) { |
| 252 | // GDB already knows about the main executable |
| 253 | return; |
| 254 | } |
| 255 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 256 | ScopedPthreadMutexLocker locker(&g__r_debug_mutex); |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 257 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 258 | _r_debug.r_state = r_debug::RT_DELETE; |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 259 | rtld_db_dlactivity(); |
| 260 | |
| 261 | remove_soinfo_from_debug_map(info); |
| 262 | |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 263 | _r_debug.r_state = r_debug::RT_CONSISTENT; |
Iliyan Malchev | 5e12d7e | 2009-03-24 19:02:00 -0700 | [diff] [blame] | 264 | rtld_db_dlactivity(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 265 | } |
| 266 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 267 | void notify_gdb_of_libraries() { |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 268 | _r_debug.r_state = r_debug::RT_ADD; |
| 269 | rtld_db_dlactivity(); |
| 270 | _r_debug.r_state = r_debug::RT_CONSISTENT; |
| 271 | rtld_db_dlactivity(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 272 | } |
| 273 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 274 | LinkedListEntry<soinfo>* SoinfoListAllocator::alloc() { |
| 275 | return g_soinfo_links_allocator.alloc(); |
| 276 | } |
| 277 | |
| 278 | void SoinfoListAllocator::free(LinkedListEntry<soinfo>* entry) { |
| 279 | g_soinfo_links_allocator.free(entry); |
| 280 | } |
| 281 | |
| 282 | static void protect_data(int protection) { |
| 283 | g_soinfo_allocator.protect_all(protection); |
| 284 | g_soinfo_links_allocator.protect_all(protection); |
| 285 | } |
| 286 | |
| 287 | static soinfo* soinfo_alloc(const char* name, struct stat* file_stat) { |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 288 | if (strlen(name) >= SOINFO_NAME_LEN) { |
| 289 | DL_ERR("library name \"%s\" too long", name); |
| 290 | return NULL; |
| 291 | } |
| 292 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 293 | soinfo* si = g_soinfo_allocator.alloc(); |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 294 | |
| 295 | // Initialize the new element. |
| 296 | memset(si, 0, sizeof(soinfo)); |
| 297 | strlcpy(si->name, name, sizeof(si->name)); |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 298 | si->flags = FLAG_NEW_SOINFO; |
| 299 | |
| 300 | if (file_stat != NULL) { |
| 301 | si->set_st_dev(file_stat->st_dev); |
| 302 | si->set_st_ino(file_stat->st_ino); |
| 303 | } |
| 304 | |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 305 | sonext->next = si; |
| 306 | sonext = si; |
| 307 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 308 | TRACE("name %s: allocated soinfo @ %p", name, si); |
Magnus Malmborn | ba98d92 | 2012-09-12 13:00:55 +0200 | [diff] [blame] | 309 | return si; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 310 | } |
| 311 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 312 | static void soinfo_free(soinfo* si) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 313 | if (si == NULL) { |
| 314 | return; |
| 315 | } |
| 316 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 317 | if (si->base != 0 && si->size != 0) { |
| 318 | munmap(reinterpret_cast<void*>(si->base), si->size); |
| 319 | } |
| 320 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 321 | soinfo *prev = NULL, *trav; |
| 322 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 323 | TRACE("name %s: freeing soinfo @ %p", si->name, si); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 324 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 325 | for (trav = solist; trav != NULL; trav = trav->next) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 326 | if (trav == si) |
| 327 | break; |
| 328 | prev = trav; |
| 329 | } |
| 330 | if (trav == NULL) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 331 | /* si was not in solist */ |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 332 | 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] | 333 | return; |
| 334 | } |
| 335 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 336 | // clear links to/from si |
| 337 | si->remove_all_links(); |
| 338 | |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 339 | /* 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] | 340 | always the static libdl_info. |
| 341 | */ |
| 342 | prev->next = si->next; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 343 | if (si == sonext) { |
| 344 | sonext = prev; |
| 345 | } |
Dmitriy Ivanov | d597d26 | 2014-05-05 16:49:04 -0700 | [diff] [blame] | 346 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 347 | g_soinfo_allocator.free(si); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 348 | } |
| 349 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 350 | |
| 351 | static void parse_path(const char* path, const char* delimiters, |
| 352 | const char** array, char* buf, size_t buf_size, size_t max_count) { |
| 353 | if (path == NULL) { |
| 354 | return; |
| 355 | } |
| 356 | |
| 357 | size_t len = strlcpy(buf, path, buf_size); |
| 358 | |
| 359 | size_t i = 0; |
| 360 | char* buf_p = buf; |
| 361 | while (i < max_count && (array[i] = strsep(&buf_p, delimiters))) { |
| 362 | if (*array[i] != '\0') { |
| 363 | ++i; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | // Forget the last path if we had to truncate; this occurs if the 2nd to |
| 368 | // last char isn't '\0' (i.e. wasn't originally a delimiter). |
| 369 | if (i > 0 && len >= buf_size && buf[buf_size - 2] != '\0') { |
| 370 | array[i - 1] = NULL; |
| 371 | } else { |
| 372 | array[i] = NULL; |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | static void parse_LD_LIBRARY_PATH(const char* path) { |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 377 | parse_path(path, ":", g_ld_library_paths, |
| 378 | g_ld_library_paths_buffer, sizeof(g_ld_library_paths_buffer), LDPATH_MAX); |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | static void parse_LD_PRELOAD(const char* path) { |
| 382 | // We have historically supported ':' as well as ' ' in LD_PRELOAD. |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 383 | parse_path(path, " :", g_ld_preload_names, |
| 384 | g_ld_preloads_buffer, sizeof(g_ld_preloads_buffer), LDPRELOAD_MAX); |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 385 | } |
| 386 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 387 | #if defined(__arm__) |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 388 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 389 | /* For a given PC, find the .so that it belongs to. |
| 390 | * Returns the base address of the .ARM.exidx section |
| 391 | * for that .so, and the number of 8-byte entries |
| 392 | * in that section (via *pcount). |
| 393 | * |
| 394 | * Intended to be called by libc's __gnu_Unwind_Find_exidx(). |
| 395 | * |
Elliott Hughes | 3b297c4 | 2012-10-11 16:08:51 -0700 | [diff] [blame] | 396 | * 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] | 397 | */ |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 398 | _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] | 399 | unsigned addr = (unsigned)pc; |
| 400 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 401 | for (soinfo* si = solist; si != 0; si = si->next) { |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 402 | if ((addr >= si->base) && (addr < (si->base + si->size))) { |
| 403 | *pcount = si->ARM_exidx_count; |
Ji-Hwan Lee | f186a18 | 2012-05-31 20:20:36 +0900 | [diff] [blame] | 404 | return (_Unwind_Ptr)si->ARM_exidx; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 405 | } |
| 406 | } |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 407 | *pcount = 0; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 408 | return NULL; |
| 409 | } |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 410 | |
Christopher Ferris | 24053a4 | 2013-08-19 17:45:09 -0700 | [diff] [blame] | 411 | #endif |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 412 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 413 | /* Here, we only have to provide a callback to iterate across all the |
| 414 | * loaded libraries. gcc_eh does the rest. */ |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 415 | 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] | 416 | int rv = 0; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 417 | for (soinfo* si = solist; si != NULL; si = si->next) { |
| 418 | dl_phdr_info dl_info; |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 419 | dl_info.dlpi_addr = si->link_map_head.l_addr; |
| 420 | 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] | 421 | dl_info.dlpi_phdr = si->phdr; |
| 422 | dl_info.dlpi_phnum = si->phnum; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 423 | rv = cb(&dl_info, sizeof(dl_phdr_info), data); |
| 424 | if (rv != 0) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 425 | break; |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 426 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 427 | } |
| 428 | return rv; |
| 429 | } |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 430 | |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 431 | static ElfW(Sym)* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 432 | ElfW(Sym)* symtab = si->symtab; |
| 433 | const char* strtab = si->strtab; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 434 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 435 | TRACE_TYPE(LOOKUP, "SEARCH %s in %s@%p %x %zd", |
| 436 | 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] | 437 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 438 | for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) { |
| 439 | ElfW(Sym)* s = symtab + n; |
| 440 | if (strcmp(strtab + s->st_name, name)) continue; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 441 | |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 442 | /* only concern ourselves with global and weak symbol definitions */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 443 | switch (ELF_ST_BIND(s->st_info)) { |
| 444 | case STB_GLOBAL: |
| 445 | case STB_WEAK: |
| 446 | if (s->st_shndx == SHN_UNDEF) { |
Dmitriy Ivanov | d97e9f5 | 2014-06-29 12:28:37 -0700 | [diff] [blame] | 447 | continue; |
| 448 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 449 | |
Dmitriy Ivanov | d97e9f5 | 2014-06-29 12:28:37 -0700 | [diff] [blame] | 450 | TRACE_TYPE(LOOKUP, "FOUND %s in %s (%p) %zd", |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 451 | name, si->name, reinterpret_cast<void*>(s->st_value), |
| 452 | static_cast<size_t>(s->st_size)); |
Dmitriy Ivanov | d97e9f5 | 2014-06-29 12:28:37 -0700 | [diff] [blame] | 453 | return s; |
| 454 | case STB_LOCAL: |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 455 | continue; |
Dmitriy Ivanov | d97e9f5 | 2014-06-29 12:28:37 -0700 | [diff] [blame] | 456 | default: |
Dmitriy Ivanov | 12bf3bc | 2014-07-01 14:24:45 -0700 | [diff] [blame] | 457 | __libc_fatal("ERROR: Unexpected ST_BIND value: %d for '%s' in '%s'", |
| 458 | ELF_ST_BIND(s->st_info), name, si->name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 459 | } |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 460 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 461 | |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 462 | TRACE_TYPE(LOOKUP, "NOT FOUND %s in %s@%p %x %zd", |
| 463 | name, si->name, reinterpret_cast<void*>(si->base), hash, hash % si->nbucket); |
| 464 | |
| 465 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 466 | return NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 467 | } |
| 468 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 469 | static unsigned elfhash(const char* _name) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 470 | 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] | 471 | unsigned h = 0, g; |
| 472 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 473 | while (*name) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 474 | h = (h << 4) + *name++; |
| 475 | g = h & 0xf0000000; |
| 476 | h ^= g; |
| 477 | h ^= g >> 24; |
| 478 | } |
| 479 | return h; |
| 480 | } |
| 481 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 482 | 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] | 483 | unsigned elf_hash = elfhash(name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 484 | ElfW(Sym)* s = NULL; |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 485 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 486 | if (si != NULL && somain != NULL) { |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 487 | /* |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 488 | * Local scope is executable scope. Just start looking into it right away |
| 489 | * for the shortcut. |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 490 | */ |
| 491 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 492 | if (si == somain) { |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 493 | s = soinfo_elf_lookup(si, elf_hash, name); |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 494 | if (s != NULL) { |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 495 | *lsi = si; |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 496 | goto done; |
| 497 | } |
Dmitriy Ivanov | 05e190c | 2014-08-29 10:15:25 -0700 | [diff] [blame^] | 498 | |
| 499 | /* Next, look for it in the preloads list */ |
| 500 | for (int i = 0; g_ld_preloads[i] != NULL; i++) { |
| 501 | s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name); |
| 502 | if (s != NULL) { |
| 503 | *lsi = g_ld_preloads[i]; |
| 504 | goto done; |
| 505 | } |
| 506 | } |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 507 | } else { |
| 508 | /* Order of symbol lookup is controlled by DT_SYMBOLIC flag */ |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 509 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 510 | /* |
| 511 | * If this object was built with symbolic relocations disabled, the |
| 512 | * first place to look to resolve external references is the main |
| 513 | * executable. |
| 514 | */ |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 515 | |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 516 | if (!si->has_DT_SYMBOLIC) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 517 | DEBUG("%s: looking up %s in executable %s", |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 518 | si->name, name, somain->name); |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 519 | s = soinfo_elf_lookup(somain, elf_hash, name); |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 520 | if (s != NULL) { |
| 521 | *lsi = somain; |
| 522 | goto done; |
| 523 | } |
Dmitriy Ivanov | 05e190c | 2014-08-29 10:15:25 -0700 | [diff] [blame^] | 524 | |
| 525 | /* Next, look for it in the preloads list */ |
| 526 | for (int i = 0; g_ld_preloads[i] != NULL; i++) { |
| 527 | s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name); |
| 528 | if (s != NULL) { |
| 529 | *lsi = g_ld_preloads[i]; |
| 530 | goto done; |
| 531 | } |
| 532 | } |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | /* Look for symbols in the local scope (the object who is |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 536 | * searching). This happens with C++ templates on x86 for some |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 537 | * reason. |
| 538 | * |
| 539 | * Notes on weak symbols: |
| 540 | * The ELF specs are ambiguous about treatment of weak definitions in |
| 541 | * dynamic linking. Some systems return the first definition found |
| 542 | * and some the first non-weak definition. This is system dependent. |
| 543 | * Here we return the first definition found for simplicity. */ |
| 544 | |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 545 | s = soinfo_elf_lookup(si, elf_hash, name); |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 546 | if (s != NULL) { |
| 547 | *lsi = si; |
| 548 | goto done; |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * If this object was built with -Bsymbolic and symbol is not found |
| 553 | * in the local scope, try to find the symbol in the main executable. |
| 554 | */ |
| 555 | |
| 556 | if (si->has_DT_SYMBOLIC) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 557 | DEBUG("%s: looking up %s in executable %s after local scope", |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 558 | si->name, name, somain->name); |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 559 | s = soinfo_elf_lookup(somain, elf_hash, name); |
Pavel Chupin | c77c434 | 2012-10-31 13:55:51 +0400 | [diff] [blame] | 560 | if (s != NULL) { |
| 561 | *lsi = somain; |
| 562 | goto done; |
| 563 | } |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 564 | |
Dmitriy Ivanov | 05e190c | 2014-08-29 10:15:25 -0700 | [diff] [blame^] | 565 | /* Next, look for it in the preloads list */ |
| 566 | for (int i = 0; g_ld_preloads[i] != NULL; i++) { |
| 567 | s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name); |
| 568 | if (s != NULL) { |
| 569 | *lsi = g_ld_preloads[i]; |
| 570 | goto done; |
| 571 | } |
| 572 | } |
| 573 | } |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 574 | } |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 575 | } |
| 576 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 577 | for (int i = 0; needed[i] != NULL; i++) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 578 | DEBUG("%s: looking up %s in %s", |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 579 | si->name, name, needed[i]->name); |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 580 | s = soinfo_elf_lookup(needed[i], elf_hash, name); |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 581 | if (s != NULL) { |
| 582 | *lsi = needed[i]; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 583 | goto done; |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 584 | } |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | done: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 588 | if (s != NULL) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 589 | TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, " |
| 590 | "found in %s, base = %p, load bias = %p", |
| 591 | si->name, name, reinterpret_cast<void*>(s->st_value), |
| 592 | (*lsi)->name, reinterpret_cast<void*>((*lsi)->base), |
| 593 | reinterpret_cast<void*>((*lsi)->load_bias)); |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 594 | return s; |
| 595 | } |
| 596 | |
Doug Kwan | 9430435 | 2009-10-23 18:11:40 -0700 | [diff] [blame] | 597 | return NULL; |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 598 | } |
| 599 | |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 600 | // Another soinfo list allocator to use in dlsym. We don't reuse |
| 601 | // SoinfoListAllocator because it is write-protected most of the time. |
| 602 | static LinkerAllocator<LinkedListEntry<soinfo>> g_soinfo_list_allocator_rw; |
| 603 | class SoinfoListAllocatorRW { |
| 604 | public: |
| 605 | static LinkedListEntry<soinfo>* alloc() { |
| 606 | return g_soinfo_list_allocator_rw.alloc(); |
| 607 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 608 | |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 609 | static void free(LinkedListEntry<soinfo>* ptr) { |
| 610 | g_soinfo_list_allocator_rw.free(ptr); |
| 611 | } |
| 612 | }; |
| 613 | |
| 614 | // This is used by dlsym(3). It performs symbol lookup only within the |
| 615 | // specified soinfo object and its dependencies in breadth first order. |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 616 | ElfW(Sym)* dlsym_handle_lookup(soinfo* si, soinfo** found, const char* name) { |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 617 | LinkedList<soinfo, SoinfoListAllocatorRW> visit_list; |
Dmitriy Ivanov | 8a84d38 | 2014-08-12 21:02:13 -0700 | [diff] [blame] | 618 | LinkedList<soinfo, SoinfoListAllocatorRW> visited; |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 619 | visit_list.push_back(si); |
| 620 | soinfo* current_soinfo; |
| 621 | while ((current_soinfo = visit_list.pop_front()) != nullptr) { |
Dmitriy Ivanov | 8a84d38 | 2014-08-12 21:02:13 -0700 | [diff] [blame] | 622 | if (visited.contains(current_soinfo)) { |
| 623 | continue; |
| 624 | } |
| 625 | |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 626 | ElfW(Sym)* result = soinfo_elf_lookup(current_soinfo, elfhash(name), name); |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 627 | |
| 628 | if (result != nullptr) { |
| 629 | *found = current_soinfo; |
| 630 | visit_list.clear(); |
Dmitriy Ivanov | 8a84d38 | 2014-08-12 21:02:13 -0700 | [diff] [blame] | 631 | visited.clear(); |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 632 | return result; |
| 633 | } |
Dmitriy Ivanov | 8a84d38 | 2014-08-12 21:02:13 -0700 | [diff] [blame] | 634 | visited.push_back(current_soinfo); |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 635 | |
| 636 | current_soinfo->get_children().for_each([&](soinfo* child) { |
| 637 | visit_list.push_back(child); |
| 638 | }); |
| 639 | } |
| 640 | |
| 641 | visit_list.clear(); |
Dmitriy Ivanov | 8a84d38 | 2014-08-12 21:02:13 -0700 | [diff] [blame] | 642 | visited.clear(); |
Dmitriy Ivanov | db7a17d | 2014-08-04 23:39:22 +0000 | [diff] [blame] | 643 | return nullptr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 644 | } |
| 645 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 646 | /* This is used by dlsym(3) to performs a global symbol lookup. If the |
| 647 | start value is null (for RTLD_DEFAULT), the search starts at the |
| 648 | beginning of the global solist. Otherwise the search starts at the |
| 649 | specified soinfo (for RTLD_NEXT). |
Iliyan Malchev | 6ed80c8 | 2009-09-28 19:38:04 -0700 | [diff] [blame] | 650 | */ |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 651 | ElfW(Sym)* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start) { |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 652 | unsigned elf_hash = elfhash(name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 653 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 654 | if (start == NULL) { |
| 655 | start = solist; |
| 656 | } |
| 657 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 658 | ElfW(Sym)* s = NULL; |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 659 | for (soinfo* si = start; (s == NULL) && (si != NULL); si = si->next) { |
Dmitriy Ivanov | 9419420 | 2014-08-18 15:08:51 -0700 | [diff] [blame] | 660 | s = soinfo_elf_lookup(si, elf_hash, name); |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 661 | if (s != NULL) { |
| 662 | *found = si; |
| 663 | break; |
Matt Fischer | 1698d9e | 2009-12-31 12:17:56 -0600 | [diff] [blame] | 664 | } |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 665 | } |
Matt Fischer | 1698d9e | 2009-12-31 12:17:56 -0600 | [diff] [blame] | 666 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 667 | if (s != NULL) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 668 | TRACE_TYPE(LOOKUP, "%s s->st_value = %p, found->base = %p", |
| 669 | name, reinterpret_cast<void*>(s->st_value), reinterpret_cast<void*>((*found)->base)); |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 670 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 671 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 672 | return s; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 673 | } |
| 674 | |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 675 | soinfo* find_containing_library(const void* p) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 676 | ElfW(Addr) address = reinterpret_cast<ElfW(Addr)>(p); |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 677 | for (soinfo* si = solist; si != NULL; si = si->next) { |
| 678 | if (address >= si->base && address - si->base < si->size) { |
| 679 | return si; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 680 | } |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 681 | } |
| 682 | return NULL; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 683 | } |
| 684 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 685 | ElfW(Sym)* dladdr_find_symbol(soinfo* si, const void* addr) { |
| 686 | ElfW(Addr) soaddr = reinterpret_cast<ElfW(Addr)>(addr) - si->base; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 687 | |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 688 | // Search the library's symbol table for any defined symbol which |
| 689 | // contains this address. |
| 690 | for (size_t i = 0; i < si->nchain; ++i) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 691 | ElfW(Sym)* sym = &si->symtab[i]; |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 692 | if (sym->st_shndx != SHN_UNDEF && |
| 693 | soaddr >= sym->st_value && |
| 694 | soaddr < sym->st_value + sym->st_size) { |
| 695 | return sym; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 696 | } |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 697 | } |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 698 | |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 699 | return NULL; |
Matt Fischer | e2a8b1f | 2009-12-31 12:17:40 -0600 | [diff] [blame] | 700 | } |
| 701 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 702 | static int open_library_on_path(const char* name, const char* const paths[]) { |
| 703 | char buf[512]; |
| 704 | for (size_t i = 0; paths[i] != NULL; ++i) { |
Elliott Hughes | 1e980b6 | 2013-01-17 18:36:06 -0800 | [diff] [blame] | 705 | 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] | 706 | if (n < 0 || n >= static_cast<int>(sizeof(buf))) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 707 | PRINT("Warning: ignoring very long library path: %s/%s", paths[i], name); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 708 | continue; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 709 | } |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 710 | int fd = TEMP_FAILURE_RETRY(open(buf, O_RDONLY | O_CLOEXEC)); |
| 711 | if (fd != -1) { |
| 712 | return fd; |
| 713 | } |
| 714 | } |
| 715 | return -1; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 716 | } |
| 717 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 718 | static int open_library(const char* name) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 719 | TRACE("[ opening %s ]", name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 720 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 721 | // If the name contains a slash, we should attempt to open it directly and not search the paths. |
| 722 | if (strchr(name, '/') != NULL) { |
Elliott Hughes | 6971fe4 | 2012-11-01 22:59:19 -0700 | [diff] [blame] | 723 | int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CLOEXEC)); |
| 724 | if (fd != -1) { |
| 725 | return fd; |
| 726 | } |
| 727 | // ...but nvidia binary blobs (at least) rely on this behavior, so fall through for now. |
Dmitriy Ivanov | 5ca7ed9 | 2014-05-02 18:18:50 -0700 | [diff] [blame] | 728 | #if defined(__LP64__) |
Dmitriy Ivanov | e43c4a7 | 2014-06-29 13:00:23 -0700 | [diff] [blame] | 729 | return -1; |
Dmitriy Ivanov | 5ca7ed9 | 2014-05-02 18:18:50 -0700 | [diff] [blame] | 730 | #endif |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 731 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 732 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 733 | // Otherwise we try LD_LIBRARY_PATH first, and fall back to the built-in well known paths. |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 734 | int fd = open_library_on_path(name, g_ld_library_paths); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 735 | if (fd == -1) { |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 736 | fd = open_library_on_path(name, kDefaultLdPaths); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 737 | } |
| 738 | return fd; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 739 | } |
| 740 | |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 741 | static soinfo* load_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { |
Dmitriy Ivanov | 04dc91a | 2014-07-01 14:10:16 -0700 | [diff] [blame] | 742 | int fd = -1; |
| 743 | ScopedFd file_guard(-1); |
| 744 | |
| 745 | if (extinfo != NULL && (extinfo->flags & ANDROID_DLEXT_USE_LIBRARY_FD) != 0) { |
| 746 | fd = extinfo->library_fd; |
| 747 | } else { |
| 748 | // Open the file. |
| 749 | fd = open_library(name); |
| 750 | if (fd == -1) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 751 | DL_ERR("library \"%s\" not found", name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 752 | return NULL; |
Dmitriy Ivanov | 04dc91a | 2014-07-01 14:10:16 -0700 | [diff] [blame] | 753 | } |
| 754 | |
| 755 | file_guard.reset(fd); |
Dima Zavin | 2e85579 | 2009-05-20 18:28:09 -0700 | [diff] [blame] | 756 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 757 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 758 | ElfReader elf_reader(name, fd); |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 759 | |
| 760 | struct stat file_stat; |
| 761 | if (TEMP_FAILURE_RETRY(fstat(fd, &file_stat)) != 0) { |
| 762 | DL_ERR("unable to stat file for the library %s: %s", name, strerror(errno)); |
| 763 | return NULL; |
| 764 | } |
| 765 | |
| 766 | // Check for symlink and other situations where |
| 767 | // file can have different names. |
| 768 | for (soinfo* si = solist; si != NULL; si = si->next) { |
| 769 | if (si->get_st_dev() != 0 && |
| 770 | si->get_st_ino() != 0 && |
| 771 | si->get_st_dev() == file_stat.st_dev && |
| 772 | si->get_st_ino() == file_stat.st_ino) { |
| 773 | TRACE("library \"%s\" is already loaded under different name/path \"%s\" - will return existing soinfo", name, si->name); |
| 774 | return si; |
| 775 | } |
| 776 | } |
| 777 | |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 778 | if ((dlflags & RTLD_NOLOAD) != 0) { |
| 779 | return NULL; |
| 780 | } |
| 781 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 782 | // Read the ELF header and load the segments. |
Torne (Richard Coles) | 12bbb91 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 783 | if (!elf_reader.Load(extinfo)) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 784 | return NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 785 | } |
| 786 | |
Dmitriy Ivanov | 489e498 | 2014-05-19 15:19:52 -0700 | [diff] [blame] | 787 | soinfo* si = soinfo_alloc(SEARCH_NAME(name), &file_stat); |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 788 | if (si == NULL) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 789 | return NULL; |
David 'Digit' Turner | 23363ed | 2012-06-18 18:13:49 +0200 | [diff] [blame] | 790 | } |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 791 | si->base = elf_reader.load_start(); |
| 792 | si->size = elf_reader.load_size(); |
| 793 | si->load_bias = elf_reader.load_bias(); |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 794 | si->phnum = elf_reader.phdr_count(); |
| 795 | si->phdr = elf_reader.loaded_phdr(); |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 796 | |
| 797 | // At this point we know that whatever is loaded @ base is a valid ELF |
| 798 | // shared library whose segments are properly mapped in. |
Dmitriy Ivanov | 04dc91a | 2014-07-01 14:10:16 -0700 | [diff] [blame] | 799 | TRACE("[ load_library base=%p size=%zu name='%s' ]", |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 800 | reinterpret_cast<void*>(si->base), si->size, si->name); |
| 801 | |
| 802 | if (!soinfo_link_image(si, extinfo)) { |
| 803 | soinfo_free(si); |
| 804 | return NULL; |
| 805 | } |
| 806 | |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 807 | return si; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 808 | } |
| 809 | |
Dmitriy Ivanov | 489e498 | 2014-05-19 15:19:52 -0700 | [diff] [blame] | 810 | static soinfo *find_loaded_library_by_name(const char* name) { |
| 811 | const char* search_name = SEARCH_NAME(name); |
| 812 | for (soinfo* si = solist; si != NULL; si = si->next) { |
| 813 | if (!strcmp(search_name, si->name)) { |
| 814 | return si; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 815 | } |
Dmitriy Ivanov | 489e498 | 2014-05-19 15:19:52 -0700 | [diff] [blame] | 816 | } |
| 817 | return NULL; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 818 | } |
| 819 | |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 820 | static soinfo* find_library_internal(const char* name, int dlflags, const android_dlextinfo* extinfo) { |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 821 | if (name == NULL) { |
| 822 | return somain; |
| 823 | } |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 824 | |
Dmitriy Ivanov | 489e498 | 2014-05-19 15:19:52 -0700 | [diff] [blame] | 825 | soinfo* si = find_loaded_library_by_name(name); |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 826 | |
| 827 | // Library might still be loaded, the accurate detection |
| 828 | // of this fact is done by load_library |
| 829 | if (si == NULL) { |
| 830 | TRACE("[ '%s' has not been found by name. Trying harder...]", name); |
| 831 | si = load_library(name, dlflags, extinfo); |
| 832 | } |
| 833 | |
| 834 | if (si != NULL && (si->flags & FLAG_LINKED) == 0) { |
| 835 | DL_ERR("recursive link to \"%s\"", si->name); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 836 | return NULL; |
| 837 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 838 | |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 839 | return si; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 840 | } |
| 841 | |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 842 | static soinfo* find_library(const char* name, int dlflags, const android_dlextinfo* extinfo) { |
| 843 | soinfo* si = find_library_internal(name, dlflags, extinfo); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 844 | if (si != NULL) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 845 | si->ref_count++; |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 846 | } |
| 847 | return si; |
| 848 | } |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 849 | |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 850 | static void soinfo_unload(soinfo* si) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 851 | if (si->ref_count == 1) { |
| 852 | TRACE("unloading '%s'", si->name); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 853 | si->CallDestructors(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 854 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 855 | if ((si->flags | FLAG_NEW_SOINFO) != 0) { |
| 856 | si->get_children().for_each([&] (soinfo* child) { |
| 857 | TRACE("%s needs to unload %s", si->name, child->name); |
| 858 | soinfo_unload(child); |
| 859 | }); |
| 860 | } else { |
| 861 | for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { |
| 862 | if (d->d_tag == DT_NEEDED) { |
| 863 | const char* library_name = si->strtab + d->d_un.d_val; |
| 864 | TRACE("%s needs to unload %s", si->name, library_name); |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 865 | soinfo* needed = find_library(library_name, RTLD_NOLOAD, NULL); |
| 866 | if (needed != NULL) { |
| 867 | soinfo_unload(needed); |
| 868 | } else { |
| 869 | // Not found: for example if symlink was deleted between dlopen and dlclose |
| 870 | // Since we cannot really handle errors at this point - print and continue. |
| 871 | PRINT("warning: couldn't find %s needed by %s on unload.", library_name, si->name); |
| 872 | } |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 873 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 874 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 875 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 876 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 877 | notify_gdb_of_unload(si); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 878 | si->ref_count = 0; |
Dmitriy Ivanov | d597d26 | 2014-05-05 16:49:04 -0700 | [diff] [blame] | 879 | soinfo_free(si); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 880 | } else { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 881 | si->ref_count--; |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 882 | 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] | 883 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 884 | } |
| 885 | |
Elliott Hughes | a4aafd1 | 2014-01-13 16:37:47 -0800 | [diff] [blame] | 886 | void do_android_get_LD_LIBRARY_PATH(char* buffer, size_t buffer_size) { |
Christopher Ferris | 172955a | 2014-08-26 20:48:11 -0700 | [diff] [blame] | 887 | // Use basic string manipulation calls to avoid snprintf. |
| 888 | // snprintf indirectly calls pthread_getspecific to get the size of a buffer. |
| 889 | // When debug malloc is enabled, this call returns 0. This in turn causes |
| 890 | // snprintf to do nothing, which causes libraries to fail to load. |
| 891 | // See b/17302493 for further details. |
| 892 | // Once the above bug is fixed, this code can be modified to use |
| 893 | // snprintf again. |
| 894 | size_t required_len = strlen(kDefaultLdPaths[0]) + strlen(kDefaultLdPaths[1]) + 2; |
| 895 | if (buffer_size < required_len) { |
| 896 | __libc_fatal("android_get_LD_LIBRARY_PATH failed, buffer too small: buffer len %zu, required len %zu", |
| 897 | buffer_size, required_len); |
| 898 | } |
| 899 | char* end = stpcpy(buffer, kDefaultLdPaths[0]); |
| 900 | *end = ':'; |
| 901 | strcpy(end + 1, kDefaultLdPaths[1]); |
Elliott Hughes | a4aafd1 | 2014-01-13 16:37:47 -0800 | [diff] [blame] | 902 | } |
| 903 | |
Elliott Hughes | cade4c3 | 2012-12-20 14:42:14 -0800 | [diff] [blame] | 904 | void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path) { |
| 905 | if (!get_AT_SECURE()) { |
| 906 | parse_LD_LIBRARY_PATH(ld_library_path); |
| 907 | } |
| 908 | } |
| 909 | |
Elliott Hughes | 1a58629 | 2014-06-03 16:23:08 -0700 | [diff] [blame] | 910 | soinfo* do_dlopen(const char* name, int flags, const android_dlextinfo* extinfo) { |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 911 | if ((flags & ~(RTLD_NOW|RTLD_LAZY|RTLD_LOCAL|RTLD_GLOBAL|RTLD_NOLOAD)) != 0) { |
Elliott Hughes | e66190d | 2012-12-18 15:57:55 -0800 | [diff] [blame] | 912 | DL_ERR("invalid flags to dlopen: %x", flags); |
| 913 | return NULL; |
| 914 | } |
Torne (Richard Coles) | 012cb45 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 915 | if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) { |
Dmitriy Ivanov | 3a8646f | 2014-07-08 11:21:56 -0700 | [diff] [blame] | 916 | DL_ERR("invalid extended flags to android_dlopen_ext: %" PRIx64, extinfo->flags); |
Torne (Richard Coles) | 012cb45 | 2014-02-06 14:34:21 +0000 | [diff] [blame] | 917 | return NULL; |
| 918 | } |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 919 | protect_data(PROT_READ | PROT_WRITE); |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 920 | soinfo* si = find_library(name, flags, extinfo); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 921 | if (si != NULL) { |
| 922 | si->CallConstructors(); |
| 923 | } |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 924 | protect_data(PROT_READ); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 925 | return si; |
| 926 | } |
| 927 | |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 928 | void do_dlclose(soinfo* si) { |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 929 | protect_data(PROT_READ | PROT_WRITE); |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 930 | soinfo_unload(si); |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 931 | protect_data(PROT_READ); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 932 | } |
| 933 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 934 | #if defined(USE_RELA) |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 935 | 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] | 936 | ElfW(Sym)* s; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 937 | soinfo* lsi; |
| 938 | |
| 939 | for (size_t idx = 0; idx < count; ++idx, ++rela) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 940 | unsigned type = ELFW(R_TYPE)(rela->r_info); |
| 941 | unsigned sym = ELFW(R_SYM)(rela->r_info); |
| 942 | ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rela->r_offset + si->load_bias); |
| 943 | ElfW(Addr) sym_addr = 0; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 944 | const char* sym_name = NULL; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 945 | |
| 946 | DEBUG("Processing '%s' relocation at index %zd", si->name, idx); |
| 947 | if (type == 0) { // R_*_NONE |
| 948 | continue; |
| 949 | } |
| 950 | if (sym != 0) { |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 951 | 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] | 952 | s = soinfo_do_lookup(si, sym_name, &lsi, needed); |
| 953 | if (s == NULL) { |
| 954 | // We only allow an undefined symbol if this is a weak reference... |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 955 | s = &si->symtab[sym]; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 956 | if (ELF_ST_BIND(s->st_info) != STB_WEAK) { |
| 957 | DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, si->name); |
| 958 | return -1; |
| 959 | } |
| 960 | |
| 961 | /* IHI0044C AAELF 4.5.1.1: |
| 962 | |
| 963 | Libraries are not searched to resolve weak references. |
| 964 | It is not an error for a weak reference to remain unsatisfied. |
| 965 | |
| 966 | During linking, the value of an undefined weak reference is: |
| 967 | - Zero if the relocation type is absolute |
| 968 | - The address of the place if the relocation is pc-relative |
| 969 | - The address of nominal base address if the relocation |
| 970 | type is base-relative. |
| 971 | */ |
| 972 | |
| 973 | switch (type) { |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 974 | #if defined(__aarch64__) |
| 975 | case R_AARCH64_JUMP_SLOT: |
| 976 | case R_AARCH64_GLOB_DAT: |
| 977 | case R_AARCH64_ABS64: |
| 978 | case R_AARCH64_ABS32: |
| 979 | case R_AARCH64_ABS16: |
| 980 | case R_AARCH64_RELATIVE: |
| 981 | /* |
| 982 | * The sym_addr was initialized to be zero above, or the relocation |
| 983 | * code below does not care about value of sym_addr. |
| 984 | * No need to do anything. |
| 985 | */ |
| 986 | break; |
| 987 | #elif defined(__x86_64__) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 988 | case R_X86_64_JUMP_SLOT: |
| 989 | case R_X86_64_GLOB_DAT: |
| 990 | case R_X86_64_32: |
Pavel Chupin | bb5bb20 | 2014-05-16 13:49:24 +0400 | [diff] [blame] | 991 | case R_X86_64_64: |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 992 | case R_X86_64_RELATIVE: |
| 993 | // No need to do anything. |
| 994 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 995 | case R_X86_64_PC32: |
| 996 | sym_addr = reloc; |
| 997 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 998 | #endif |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 999 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1000 | DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rela, idx); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1001 | return -1; |
| 1002 | } |
| 1003 | } else { |
| 1004 | // We got a definition. |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1005 | sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1006 | } |
| 1007 | count_relocation(kRelocSymbol); |
| 1008 | } else { |
| 1009 | s = NULL; |
| 1010 | } |
| 1011 | |
| 1012 | switch (type) { |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1013 | #if defined(__aarch64__) |
| 1014 | case R_AARCH64_JUMP_SLOT: |
| 1015 | count_relocation(kRelocAbsolute); |
| 1016 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1017 | TRACE_TYPE(RELO, "RELO JMP_SLOT %16llx <- %16llx %s\n", |
| 1018 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 1019 | *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1020 | break; |
| 1021 | case R_AARCH64_GLOB_DAT: |
| 1022 | count_relocation(kRelocAbsolute); |
| 1023 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1024 | TRACE_TYPE(RELO, "RELO GLOB_DAT %16llx <- %16llx %s\n", |
| 1025 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 1026 | *reinterpret_cast<ElfW(Addr)*>(reloc) = (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1027 | break; |
| 1028 | case R_AARCH64_ABS64: |
| 1029 | count_relocation(kRelocAbsolute); |
| 1030 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1031 | TRACE_TYPE(RELO, "RELO ABS64 %16llx <- %16llx %s\n", |
| 1032 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 1033 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1034 | break; |
| 1035 | case R_AARCH64_ABS32: |
| 1036 | count_relocation(kRelocAbsolute); |
| 1037 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1038 | TRACE_TYPE(RELO, "RELO ABS32 %16llx <- %16llx %s\n", |
| 1039 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 1040 | if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && |
| 1041 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { |
| 1042 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1043 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1044 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 1045 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), |
| 1046 | static_cast<ElfW(Addr)>(INT32_MIN), |
| 1047 | static_cast<ElfW(Addr)>(UINT32_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1048 | return -1; |
| 1049 | } |
| 1050 | break; |
| 1051 | case R_AARCH64_ABS16: |
| 1052 | count_relocation(kRelocAbsolute); |
| 1053 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1054 | TRACE_TYPE(RELO, "RELO ABS16 %16llx <- %16llx %s\n", |
| 1055 | reloc, (sym_addr + rela->r_addend), sym_name); |
| 1056 | if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend))) && |
| 1057 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { |
| 1058 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1059 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1060 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 1061 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + (sym_addr + rela->r_addend)), |
| 1062 | static_cast<ElfW(Addr)>(INT16_MIN), |
| 1063 | static_cast<ElfW(Addr)>(UINT16_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1064 | return -1; |
| 1065 | } |
| 1066 | break; |
| 1067 | case R_AARCH64_PREL64: |
| 1068 | count_relocation(kRelocRelative); |
| 1069 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1070 | TRACE_TYPE(RELO, "RELO REL64 %16llx <- %16llx - %16llx %s\n", |
| 1071 | reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); |
| 1072 | *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] | 1073 | break; |
| 1074 | case R_AARCH64_PREL32: |
| 1075 | count_relocation(kRelocRelative); |
| 1076 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1077 | TRACE_TYPE(RELO, "RELO REL32 %16llx <- %16llx - %16llx %s\n", |
| 1078 | reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); |
| 1079 | if ((static_cast<ElfW(Addr)>(INT32_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && |
| 1080 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT32_MAX))) { |
| 1081 | *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] | 1082 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1083 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 1084 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), |
| 1085 | static_cast<ElfW(Addr)>(INT32_MIN), |
| 1086 | static_cast<ElfW(Addr)>(UINT32_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1087 | return -1; |
| 1088 | } |
| 1089 | break; |
| 1090 | case R_AARCH64_PREL16: |
| 1091 | count_relocation(kRelocRelative); |
| 1092 | MARK(rela->r_offset); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1093 | TRACE_TYPE(RELO, "RELO REL16 %16llx <- %16llx - %16llx %s\n", |
| 1094 | reloc, (sym_addr + rela->r_addend), rela->r_offset, sym_name); |
| 1095 | if ((static_cast<ElfW(Addr)>(INT16_MIN) <= (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset))) && |
| 1096 | ((*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)) <= static_cast<ElfW(Addr)>(UINT16_MAX))) { |
| 1097 | *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] | 1098 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1099 | DL_ERR("0x%016llx out of range 0x%016llx to 0x%016llx", |
| 1100 | (*reinterpret_cast<ElfW(Addr)*>(reloc) + ((sym_addr + rela->r_addend) - rela->r_offset)), |
| 1101 | static_cast<ElfW(Addr)>(INT16_MIN), |
| 1102 | static_cast<ElfW(Addr)>(UINT16_MAX)); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1103 | return -1; |
| 1104 | } |
| 1105 | break; |
| 1106 | |
| 1107 | case R_AARCH64_RELATIVE: |
| 1108 | count_relocation(kRelocRelative); |
| 1109 | MARK(rela->r_offset); |
| 1110 | if (sym) { |
| 1111 | DL_ERR("odd RELATIVE form..."); |
| 1112 | return -1; |
| 1113 | } |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1114 | TRACE_TYPE(RELO, "RELO RELATIVE %16llx <- %16llx\n", |
| 1115 | reloc, (si->base + rela->r_addend)); |
| 1116 | *reinterpret_cast<ElfW(Addr)*>(reloc) = (si->base + rela->r_addend); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1117 | break; |
| 1118 | |
| 1119 | case R_AARCH64_COPY: |
Nick Kralevich | 76e289c | 2014-07-03 12:04:31 -0700 | [diff] [blame] | 1120 | /* |
| 1121 | * ET_EXEC is not supported so this should not happen. |
| 1122 | * |
| 1123 | * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf |
| 1124 | * |
| 1125 | * Section 4.7.1.10 "Dynamic relocations" |
| 1126 | * R_AARCH64_COPY may only appear in executable objects where e_type is |
| 1127 | * set to ET_EXEC. |
| 1128 | */ |
| 1129 | DL_ERR("%s R_AARCH64_COPY relocations are not supported", si->name); |
| 1130 | return -1; |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1131 | case R_AARCH64_TLS_TPREL64: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1132 | TRACE_TYPE(RELO, "RELO TLS_TPREL64 *** %16llx <- %16llx - %16llx\n", |
| 1133 | reloc, (sym_addr + rela->r_addend), rela->r_offset); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1134 | break; |
| 1135 | case R_AARCH64_TLS_DTPREL32: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1136 | TRACE_TYPE(RELO, "RELO TLS_DTPREL32 *** %16llx <- %16llx - %16llx\n", |
| 1137 | reloc, (sym_addr + rela->r_addend), rela->r_offset); |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1138 | break; |
| 1139 | #elif defined(__x86_64__) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1140 | case R_X86_64_JUMP_SLOT: |
| 1141 | count_relocation(kRelocAbsolute); |
| 1142 | MARK(rela->r_offset); |
| 1143 | TRACE_TYPE(RELO, "RELO JMP_SLOT %08zx <- %08zx %s", static_cast<size_t>(reloc), |
| 1144 | static_cast<size_t>(sym_addr + rela->r_addend), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1145 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1146 | break; |
| 1147 | case R_X86_64_GLOB_DAT: |
| 1148 | count_relocation(kRelocAbsolute); |
| 1149 | MARK(rela->r_offset); |
| 1150 | TRACE_TYPE(RELO, "RELO GLOB_DAT %08zx <- %08zx %s", static_cast<size_t>(reloc), |
| 1151 | static_cast<size_t>(sym_addr + rela->r_addend), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1152 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1153 | break; |
| 1154 | case R_X86_64_RELATIVE: |
| 1155 | count_relocation(kRelocRelative); |
| 1156 | MARK(rela->r_offset); |
| 1157 | if (sym) { |
| 1158 | DL_ERR("odd RELATIVE form..."); |
| 1159 | return -1; |
| 1160 | } |
| 1161 | TRACE_TYPE(RELO, "RELO RELATIVE %08zx <- +%08zx", static_cast<size_t>(reloc), |
| 1162 | static_cast<size_t>(si->base)); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1163 | *reinterpret_cast<ElfW(Addr)*>(reloc) = si->base + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1164 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1165 | case R_X86_64_32: |
| 1166 | count_relocation(kRelocRelative); |
| 1167 | MARK(rela->r_offset); |
| 1168 | TRACE_TYPE(RELO, "RELO R_X86_64_32 %08zx <- +%08zx %s", static_cast<size_t>(reloc), |
| 1169 | static_cast<size_t>(sym_addr), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1170 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1171 | break; |
Pavel Chupin | c075c18 | 2013-10-16 19:13:58 +0400 | [diff] [blame] | 1172 | case R_X86_64_64: |
| 1173 | count_relocation(kRelocRelative); |
| 1174 | MARK(rela->r_offset); |
| 1175 | TRACE_TYPE(RELO, "RELO R_X86_64_64 %08zx <- +%08zx %s", static_cast<size_t>(reloc), |
| 1176 | static_cast<size_t>(sym_addr), sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1177 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend; |
Pavel Chupin | c075c18 | 2013-10-16 19:13:58 +0400 | [diff] [blame] | 1178 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1179 | case R_X86_64_PC32: |
| 1180 | count_relocation(kRelocRelative); |
| 1181 | MARK(rela->r_offset); |
| 1182 | TRACE_TYPE(RELO, "RELO R_X86_64_PC32 %08zx <- +%08zx (%08zx - %08zx) %s", |
| 1183 | static_cast<size_t>(reloc), static_cast<size_t>(sym_addr - reloc), |
| 1184 | 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] | 1185 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr + rela->r_addend - reloc; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1186 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1187 | #endif |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 1188 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1189 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1190 | DL_ERR("unknown reloc type %d @ %p (%zu)", type, rela, idx); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1191 | return -1; |
| 1192 | } |
| 1193 | } |
| 1194 | return 0; |
| 1195 | } |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1196 | |
| 1197 | #else // REL, not RELA. |
| 1198 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1199 | 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] | 1200 | ElfW(Sym)* s; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1201 | soinfo* lsi; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1202 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1203 | for (size_t idx = 0; idx < count; ++idx, ++rel) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1204 | unsigned type = ELFW(R_TYPE)(rel->r_info); |
| 1205 | // TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead. |
| 1206 | unsigned sym = ELFW(R_SYM)(rel->r_info); |
| 1207 | ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + si->load_bias); |
| 1208 | ElfW(Addr) sym_addr = 0; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1209 | const char* sym_name = NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1210 | |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1211 | DEBUG("Processing '%s' relocation at index %zd", si->name, idx); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1212 | if (type == 0) { // R_*_NONE |
| 1213 | continue; |
| 1214 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1215 | if (sym != 0) { |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 1216 | 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] | 1217 | s = soinfo_do_lookup(si, sym_name, &lsi, needed); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1218 | if (s == NULL) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1219 | // We only allow an undefined symbol if this is a weak reference... |
Elliott Hughes | c62b8a4 | 2014-02-12 17:17:41 -0800 | [diff] [blame] | 1220 | s = &si->symtab[sym]; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1221 | if (ELF_ST_BIND(s->st_info) != STB_WEAK) { |
Elliott Hughes | e9b6fc6 | 2012-08-29 13:10:54 -0700 | [diff] [blame] | 1222 | 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] | 1223 | return -1; |
| 1224 | } |
| 1225 | |
| 1226 | /* IHI0044C AAELF 4.5.1.1: |
| 1227 | |
| 1228 | Libraries are not searched to resolve weak references. |
| 1229 | It is not an error for a weak reference to remain |
| 1230 | unsatisfied. |
| 1231 | |
| 1232 | During linking, the value of an undefined weak reference is: |
| 1233 | - Zero if the relocation type is absolute |
| 1234 | - The address of the place if the relocation is pc-relative |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1235 | - The address of nominal base address if the relocation |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1236 | type is base-relative. |
| 1237 | */ |
| 1238 | |
| 1239 | switch (type) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1240 | #if defined(__arm__) |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1241 | case R_ARM_JUMP_SLOT: |
| 1242 | case R_ARM_GLOB_DAT: |
| 1243 | case R_ARM_ABS32: |
| 1244 | case R_ARM_RELATIVE: /* Don't care. */ |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1245 | // sym_addr was initialized to be zero above or relocation |
| 1246 | // code below does not care about value of sym_addr. |
| 1247 | // No need to do anything. |
| 1248 | break; |
| 1249 | #elif defined(__i386__) |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1250 | case R_386_JMP_SLOT: |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1251 | case R_386_GLOB_DAT: |
| 1252 | case R_386_32: |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1253 | case R_386_RELATIVE: /* Don't care. */ |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1254 | // sym_addr was initialized to be zero above or relocation |
| 1255 | // code below does not care about value of sym_addr. |
| 1256 | // No need to do anything. |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1257 | break; |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1258 | case R_386_PC32: |
| 1259 | sym_addr = reloc; |
| 1260 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1261 | #endif |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1262 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1263 | #if defined(__arm__) |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1264 | case R_ARM_COPY: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1265 | // Fall through. Can't really copy if weak symbol is not found at run-time. |
| 1266 | #endif |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1267 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1268 | DL_ERR("unknown weak reloc type %d @ %p (%zu)", type, rel, idx); |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1269 | return -1; |
| 1270 | } |
| 1271 | } else { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1272 | // We got a definition. |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1273 | sym_addr = static_cast<ElfW(Addr)>(s->st_value + lsi->load_bias); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1274 | } |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1275 | count_relocation(kRelocSymbol); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1276 | } else { |
Doug Kwan | e823807 | 2009-10-26 12:05:23 -0700 | [diff] [blame] | 1277 | s = NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1278 | } |
| 1279 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1280 | switch (type) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1281 | #if defined(__arm__) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1282 | case R_ARM_JUMP_SLOT: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1283 | count_relocation(kRelocAbsolute); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1284 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1285 | 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] | 1286 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1287 | break; |
| 1288 | case R_ARM_GLOB_DAT: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1289 | count_relocation(kRelocAbsolute); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1290 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1291 | 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] | 1292 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1293 | break; |
| 1294 | case R_ARM_ABS32: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1295 | count_relocation(kRelocAbsolute); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1296 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1297 | 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] | 1298 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1299 | break; |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1300 | case R_ARM_REL32: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1301 | count_relocation(kRelocRelative); |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1302 | MARK(rel->r_offset); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1303 | TRACE_TYPE(RELO, "RELO REL32 %08x <- %08x - %08x %s", |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1304 | reloc, sym_addr, rel->r_offset, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1305 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr - rel->r_offset; |
David 'Digit' Turner | 34ea511 | 2009-11-17 14:56:26 -0800 | [diff] [blame] | 1306 | break; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1307 | case R_ARM_COPY: |
Nick Kralevich | 76e289c | 2014-07-03 12:04:31 -0700 | [diff] [blame] | 1308 | /* |
| 1309 | * ET_EXEC is not supported so this should not happen. |
| 1310 | * |
| 1311 | * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf |
| 1312 | * |
| 1313 | * Section 4.7.1.10 "Dynamic relocations" |
| 1314 | * R_ARM_COPY may only appear in executable objects where e_type is |
| 1315 | * set to ET_EXEC. |
| 1316 | */ |
| 1317 | DL_ERR("%s R_ARM_COPY relocations are not supported", si->name); |
| 1318 | return -1; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1319 | #elif defined(__i386__) |
| 1320 | case R_386_JMP_SLOT: |
| 1321 | count_relocation(kRelocAbsolute); |
| 1322 | MARK(rel->r_offset); |
| 1323 | 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] | 1324 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1325 | break; |
| 1326 | case R_386_GLOB_DAT: |
| 1327 | count_relocation(kRelocAbsolute); |
| 1328 | MARK(rel->r_offset); |
| 1329 | 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] | 1330 | *reinterpret_cast<ElfW(Addr)*>(reloc) = sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1331 | break; |
| 1332 | case R_386_32: |
| 1333 | count_relocation(kRelocRelative); |
| 1334 | MARK(rel->r_offset); |
| 1335 | 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] | 1336 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1337 | break; |
| 1338 | case R_386_PC32: |
| 1339 | count_relocation(kRelocRelative); |
| 1340 | MARK(rel->r_offset); |
| 1341 | TRACE_TYPE(RELO, "RELO R_386_PC32 %08x <- +%08x (%08x - %08x) %s", |
| 1342 | reloc, (sym_addr - reloc), sym_addr, reloc, sym_name); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1343 | *reinterpret_cast<ElfW(Addr)*>(reloc) += (sym_addr - reloc); |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1344 | break; |
| 1345 | #elif defined(__mips__) |
| 1346 | case R_MIPS_REL32: |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1347 | #if defined(__LP64__) |
| 1348 | // MIPS Elf64_Rel entries contain compound relocations |
| 1349 | // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case |
| 1350 | if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || |
| 1351 | ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1352 | 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] | 1353 | type, (unsigned)ELF64_R_TYPE2(rel->r_info), |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1354 | (unsigned)ELF64_R_TYPE3(rel->r_info), rel, idx); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1355 | return -1; |
| 1356 | } |
| 1357 | #endif |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1358 | count_relocation(kRelocAbsolute); |
| 1359 | MARK(rel->r_offset); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1360 | TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), |
| 1361 | static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1362 | if (s) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1363 | *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1364 | } else { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1365 | *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1366 | } |
| 1367 | break; |
| 1368 | #endif |
| 1369 | |
| 1370 | #if defined(__arm__) |
| 1371 | case R_ARM_RELATIVE: |
| 1372 | #elif defined(__i386__) |
| 1373 | case R_386_RELATIVE: |
| 1374 | #endif |
| 1375 | count_relocation(kRelocRelative); |
| 1376 | MARK(rel->r_offset); |
| 1377 | if (sym) { |
| 1378 | DL_ERR("odd RELATIVE form..."); |
| 1379 | return -1; |
| 1380 | } |
| 1381 | TRACE_TYPE(RELO, "RELO RELATIVE %p <- +%p", |
| 1382 | reinterpret_cast<void*>(reloc), reinterpret_cast<void*>(si->base)); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1383 | *reinterpret_cast<ElfW(Addr)*>(reloc) += si->base; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1384 | break; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1385 | |
| 1386 | default: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1387 | 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] | 1388 | return -1; |
| 1389 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1390 | } |
| 1391 | return 0; |
| 1392 | } |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1393 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1394 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1395 | #if defined(__mips__) |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1396 | static bool mips_relocate_got(soinfo* si, soinfo* needed[]) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1397 | ElfW(Addr)** got = si->plt_got; |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1398 | if (got == NULL) { |
| 1399 | return true; |
| 1400 | } |
| 1401 | unsigned local_gotno = si->mips_local_gotno; |
| 1402 | unsigned gotsym = si->mips_gotsym; |
| 1403 | unsigned symtabno = si->mips_symtabno; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1404 | ElfW(Sym)* symtab = si->symtab; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1405 | |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1406 | // got[0] is the address of the lazy resolver function. |
| 1407 | // got[1] may be used for a GNU extension. |
| 1408 | // Set it to a recognizable address in case someone calls it (should be _rtld_bind_start). |
| 1409 | // FIXME: maybe this should be in a separate routine? |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1410 | if ((si->flags & FLAG_LINKER) == 0) { |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1411 | size_t g = 0; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1412 | got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef); |
| 1413 | if (reinterpret_cast<intptr_t>(got[g]) < 0) { |
| 1414 | got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1415 | } |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1416 | // Relocate the local GOT entries. |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1417 | for (; g < local_gotno; g++) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1418 | 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] | 1419 | } |
| 1420 | } |
| 1421 | |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1422 | // Now for the global GOT entries... |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1423 | ElfW(Sym)* sym = symtab + gotsym; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1424 | got = si->plt_got + local_gotno; |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1425 | for (size_t g = gotsym; g < symtabno; g++, sym++, got++) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1426 | // This is an undefined reference... try to locate it. |
| 1427 | const char* sym_name = si->strtab + sym->st_name; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1428 | soinfo* lsi; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1429 | ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, needed); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1430 | if (s == NULL) { |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1431 | // We only allow an undefined symbol if this is a weak reference. |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1432 | s = &symtab[g]; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1433 | if (ELF_ST_BIND(s->st_info) != STB_WEAK) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1434 | DL_ERR("cannot locate \"%s\"...", sym_name); |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1435 | return false; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1436 | } |
| 1437 | *got = 0; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1438 | } else { |
| 1439 | // FIXME: is this sufficient? |
| 1440 | // For reference see NetBSD link loader |
| 1441 | // 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 |
| 1442 | *got = reinterpret_cast<ElfW(Addr)*>(lsi->load_bias + s->st_value); |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1443 | } |
| 1444 | } |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1445 | return true; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1446 | } |
| 1447 | #endif |
| 1448 | |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 1449 | 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] | 1450 | if (functions == NULL) { |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1451 | return; |
| 1452 | } |
David 'Digit' Turner | 8215679 | 2009-05-18 14:37:41 +0200 | [diff] [blame] | 1453 | |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1454 | 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] | 1455 | |
| 1456 | int begin = reverse ? (count - 1) : 0; |
| 1457 | int end = reverse ? -1 : count; |
| 1458 | int step = reverse ? -1 : 1; |
| 1459 | |
| 1460 | for (int i = begin; i != end; i += step) { |
| 1461 | TRACE("[ %s[%d] == %p ]", array_name, i, functions[i]); |
| 1462 | CallFunction("function", functions[i]); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1463 | } |
David 'Digit' Turner | 8215679 | 2009-05-18 14:37:41 +0200 | [diff] [blame] | 1464 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1465 | TRACE("[ Done calling %s for '%s' ]", array_name, name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1466 | } |
| 1467 | |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 1468 | void soinfo::CallFunction(const char* function_name __unused, linker_function_t function) { |
Elliott Hughes | db492b3 | 2013-01-03 15:44:03 -0800 | [diff] [blame] | 1469 | 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] | 1470 | return; |
| 1471 | } |
| 1472 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1473 | TRACE("[ Calling %s @ %p for '%s' ]", function_name, function, name); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1474 | function(); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1475 | TRACE("[ Done calling %s @ %p for '%s' ]", function_name, function, name); |
Elliott Hughes | db492b3 | 2013-01-03 15:44:03 -0800 | [diff] [blame] | 1476 | |
| 1477 | // The function may have called dlopen(3) or dlclose(3), so we need to ensure our data structures |
| 1478 | // are still writable. This happens with our debug malloc (see http://b/7941716). |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 1479 | protect_data(PROT_READ | PROT_WRITE); |
Evgeniy Stepanov | 9181a5d | 2012-08-13 17:58:37 +0400 | [diff] [blame] | 1480 | } |
| 1481 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1482 | void soinfo::CallPreInitConstructors() { |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1483 | // DT_PREINIT_ARRAY functions are called before any other constructors for executables, |
| 1484 | // but ignored in a shared library. |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1485 | CallArray("DT_PREINIT_ARRAY", preinit_array, preinit_array_count, false); |
| 1486 | } |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 1487 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1488 | void soinfo::CallConstructors() { |
| 1489 | if (constructors_called) { |
| 1490 | return; |
| 1491 | } |
Jesse Hall | f5d1693 | 2012-01-30 15:39:57 -0800 | [diff] [blame] | 1492 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1493 | // We set constructors_called before actually calling the constructors, otherwise it doesn't |
| 1494 | // protect against recursive constructor calls. One simple example of constructor recursion |
| 1495 | // is the libc debug malloc, which is implemented in libc_malloc_debug_leak.so: |
| 1496 | // 1. The program depends on libc, so libc's constructor is called here. |
| 1497 | // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so. |
| 1498 | // 3. dlopen() calls the constructors on the newly created |
| 1499 | // soinfo for libc_malloc_debug_leak.so. |
| 1500 | // 4. The debug .so depends on libc, so CallConstructors is |
| 1501 | // called again with the libc soinfo. If it doesn't trigger the early- |
| 1502 | // out above, the libc constructor will be called again (recursively!). |
| 1503 | constructors_called = true; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1504 | |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1505 | if ((flags & FLAG_EXE) == 0 && preinit_array != NULL) { |
| 1506 | // The GNU dynamic linker silently ignores these, but we warn the developer. |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1507 | PRINT("\"%s\": ignoring %zd-entry DT_PREINIT_ARRAY in shared library!", |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1508 | name, preinit_array_count); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1509 | } |
| 1510 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 1511 | get_children().for_each([] (soinfo* si) { |
| 1512 | si->CallConstructors(); |
| 1513 | }); |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 1514 | |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1515 | TRACE("\"%s\": calling constructors", name); |
| 1516 | |
| 1517 | // 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] | 1518 | CallFunction("DT_INIT", init_func); |
| 1519 | CallArray("DT_INIT_ARRAY", init_array, init_array_count, false); |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 1520 | } |
David 'Digit' Turner | 8215679 | 2009-05-18 14:37:41 +0200 | [diff] [blame] | 1521 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1522 | void soinfo::CallDestructors() { |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1523 | TRACE("\"%s\": calling destructors", name); |
| 1524 | |
| 1525 | // DT_FINI_ARRAY must be parsed in reverse order. |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1526 | CallArray("DT_FINI_ARRAY", fini_array, fini_array_count, true); |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1527 | |
| 1528 | // 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] | 1529 | CallFunction("DT_FINI", fini_func); |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 1530 | |
| 1531 | // This is needed on second call to dlopen |
| 1532 | // after library has been unloaded with RTLD_NODELETE |
| 1533 | constructors_called = false; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1534 | } |
| 1535 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 1536 | void soinfo::add_child(soinfo* child) { |
| 1537 | if ((this->flags & FLAG_NEW_SOINFO) == 0) { |
| 1538 | return; |
| 1539 | } |
| 1540 | |
| 1541 | this->children.push_front(child); |
| 1542 | child->parents.push_front(this); |
| 1543 | } |
| 1544 | |
| 1545 | void soinfo::remove_all_links() { |
| 1546 | if ((this->flags & FLAG_NEW_SOINFO) == 0) { |
| 1547 | return; |
| 1548 | } |
| 1549 | |
| 1550 | // 1. Untie connected soinfos from 'this'. |
| 1551 | children.for_each([&] (soinfo* child) { |
| 1552 | child->parents.remove_if([&] (const soinfo* parent) { |
| 1553 | return parent == this; |
| 1554 | }); |
| 1555 | }); |
| 1556 | |
| 1557 | parents.for_each([&] (soinfo* parent) { |
| 1558 | parent->children.for_each([&] (const soinfo* child) { |
| 1559 | return child == this; |
| 1560 | }); |
| 1561 | }); |
| 1562 | |
| 1563 | // 2. Once everything untied - clear local lists. |
| 1564 | parents.clear(); |
| 1565 | children.clear(); |
| 1566 | } |
| 1567 | |
| 1568 | void soinfo::set_st_dev(dev_t dev) { |
| 1569 | if ((this->flags & FLAG_NEW_SOINFO) == 0) { |
| 1570 | return; |
| 1571 | } |
| 1572 | |
| 1573 | st_dev = dev; |
| 1574 | } |
| 1575 | |
| 1576 | void soinfo::set_st_ino(ino_t ino) { |
| 1577 | if ((this->flags & FLAG_NEW_SOINFO) == 0) { |
| 1578 | return; |
| 1579 | } |
| 1580 | |
| 1581 | st_ino = ino; |
| 1582 | } |
| 1583 | |
| 1584 | dev_t soinfo::get_st_dev() { |
| 1585 | if ((this->flags & FLAG_NEW_SOINFO) == 0) { |
| 1586 | return 0; |
| 1587 | } |
| 1588 | |
| 1589 | return st_dev; |
| 1590 | }; |
| 1591 | |
| 1592 | ino_t soinfo::get_st_ino() { |
| 1593 | if ((this->flags & FLAG_NEW_SOINFO) == 0) { |
| 1594 | return 0; |
| 1595 | } |
| 1596 | |
| 1597 | return st_ino; |
| 1598 | } |
| 1599 | |
| 1600 | // This is a return on get_children() in case |
| 1601 | // 'this->flags' does not have FLAG_NEW_SOINFO set. |
| 1602 | static soinfo::soinfo_list_t g_empty_list; |
| 1603 | |
| 1604 | soinfo::soinfo_list_t& soinfo::get_children() { |
| 1605 | if ((this->flags & FLAG_NEW_SOINFO) == 0) { |
| 1606 | return g_empty_list; |
| 1607 | } |
| 1608 | |
| 1609 | return this->children; |
| 1610 | } |
| 1611 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1612 | /* Force any of the closed stdin, stdout and stderr to be associated with |
| 1613 | /dev/null. */ |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 1614 | static int nullify_closed_stdio() { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1615 | int dev_null, i, status; |
| 1616 | int return_value = 0; |
| 1617 | |
David 'Digit' Turner | 1608416 | 2012-06-12 16:25:37 +0200 | [diff] [blame] | 1618 | 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] | 1619 | if (dev_null < 0) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1620 | DL_ERR("cannot open /dev/null: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1621 | return -1; |
| 1622 | } |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1623 | TRACE("[ Opened /dev/null file-descriptor=%d]", dev_null); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1624 | |
| 1625 | /* If any of the stdio file descriptors is valid and not associated |
| 1626 | with /dev/null, dup /dev/null to it. */ |
| 1627 | for (i = 0; i < 3; i++) { |
| 1628 | /* If it is /dev/null already, we are done. */ |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1629 | if (i == dev_null) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1630 | continue; |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1631 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1632 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1633 | TRACE("[ Nullifying stdio file descriptor %d]", i); |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1634 | status = TEMP_FAILURE_RETRY(fcntl(i, F_GETFL)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1635 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1636 | /* If file is opened, we are good. */ |
| 1637 | if (status != -1) { |
| 1638 | continue; |
| 1639 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1640 | |
| 1641 | /* The only error we allow is that the file descriptor does not |
| 1642 | exist, in which case we dup /dev/null to it. */ |
| 1643 | if (errno != EBADF) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1644 | DL_ERR("fcntl failed: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1645 | return_value = -1; |
| 1646 | continue; |
| 1647 | } |
| 1648 | |
| 1649 | /* Try dupping /dev/null to this stdio file descriptor and |
| 1650 | repeat if there is a signal. Note that any errors in closing |
| 1651 | the stdio descriptor are lost. */ |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1652 | status = TEMP_FAILURE_RETRY(dup2(dev_null, i)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1653 | if (status < 0) { |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1654 | DL_ERR("dup2 failed: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1655 | return_value = -1; |
| 1656 | continue; |
| 1657 | } |
| 1658 | } |
| 1659 | |
| 1660 | /* If /dev/null is not one of the stdio file descriptors, close it. */ |
| 1661 | if (dev_null > 2) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1662 | TRACE("[ Closing /dev/null file-descriptor=%d]", dev_null); |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1663 | status = TEMP_FAILURE_RETRY(close(dev_null)); |
| 1664 | if (status == -1) { |
| 1665 | DL_ERR("close failed: %s", strerror(errno)); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1666 | return_value = -1; |
| 1667 | } |
| 1668 | } |
| 1669 | |
| 1670 | return return_value; |
| 1671 | } |
| 1672 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 1673 | static bool soinfo_link_image(soinfo* si, const android_dlextinfo* extinfo) { |
Ji-Hwan Lee | f186a18 | 2012-05-31 20:20:36 +0900 | [diff] [blame] | 1674 | /* "base" might wrap around UINT32_MAX. */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1675 | ElfW(Addr) base = si->load_bias; |
| 1676 | const ElfW(Phdr)* phdr = si->phdr; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1677 | int phnum = si->phnum; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1678 | bool relocating_linker = (si->flags & FLAG_LINKER) != 0; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1679 | |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1680 | /* We can't debug anything until the linker is relocated */ |
| 1681 | if (!relocating_linker) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1682 | INFO("[ linking %s ]", si->name); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1683 | 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] | 1684 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1685 | |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1686 | /* Extract dynamic section */ |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1687 | size_t dynamic_count; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1688 | ElfW(Word) dynamic_flags; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1689 | phdr_table_get_dynamic_section(phdr, phnum, base, &si->dynamic, |
Chris Dearman | cf23905 | 2013-01-11 15:32:20 -0800 | [diff] [blame] | 1690 | &dynamic_count, &dynamic_flags); |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1691 | if (si->dynamic == NULL) { |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1692 | if (!relocating_linker) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1693 | DL_ERR("missing PT_DYNAMIC in \"%s\"", si->name); |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1694 | } |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1695 | return false; |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1696 | } else { |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1697 | if (!relocating_linker) { |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1698 | DEBUG("dynamic = %p", si->dynamic); |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 1699 | } |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1700 | } |
| 1701 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1702 | #if defined(__arm__) |
David 'Digit' Turner | 63f99f4 | 2012-06-19 00:08:39 +0200 | [diff] [blame] | 1703 | (void) phdr_table_get_arm_exidx(phdr, phnum, base, |
| 1704 | &si->ARM_exidx, &si->ARM_exidx_count); |
| 1705 | #endif |
| 1706 | |
Elliott Hughes | 8147d3c | 2013-05-09 14:19:58 -0700 | [diff] [blame] | 1707 | // Extract useful information from dynamic section. |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1708 | uint32_t needed_count = 0; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1709 | for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1710 | DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p", |
| 1711 | d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val)); |
| 1712 | switch (d->d_tag) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1713 | case DT_HASH: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1714 | si->nbucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[0]; |
| 1715 | si->nchain = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr)[1]; |
| 1716 | si->bucket = reinterpret_cast<uint32_t*>(base + d->d_un.d_ptr + 8); |
| 1717 | 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] | 1718 | break; |
| 1719 | case DT_STRTAB: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1720 | 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] | 1721 | break; |
| 1722 | case DT_SYMTAB: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1723 | 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] | 1724 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1725 | #if !defined(__LP64__) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1726 | case DT_PLTREL: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1727 | if (d->d_un.d_val != DT_REL) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1728 | DL_ERR("unsupported DT_RELA in \"%s\"", si->name); |
| 1729 | return false; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1730 | } |
| 1731 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1732 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1733 | case DT_JMPREL: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1734 | #if defined(USE_RELA) |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1735 | 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] | 1736 | #else |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1737 | 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] | 1738 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1739 | break; |
| 1740 | case DT_PLTRELSZ: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1741 | #if defined(USE_RELA) |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1742 | si->plt_rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1743 | #else |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1744 | si->plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1745 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1746 | break; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1747 | #if defined(__mips__) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1748 | case DT_PLTGOT: |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1749 | // Used by mips and mips64. |
| 1750 | 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] | 1751 | break; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1752 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1753 | case DT_DEBUG: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1754 | // 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] | 1755 | // if the dynamic table is writable |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1756 | // FIXME: not working currently for N64 |
| 1757 | // The flags for the LOAD and DYNAMIC program headers do not agree. |
| 1758 | // The LOAD section containng the dynamic table has been mapped as |
| 1759 | // read-only, but the DYNAMIC header claims it is writable. |
| 1760 | #if !(defined(__mips__) && defined(__LP64__)) |
Elliott Hughes | 99c3205 | 2013-01-14 09:56:21 -0800 | [diff] [blame] | 1761 | if ((dynamic_flags & PF_W) != 0) { |
Elliott Hughes | c620059 | 2013-09-30 18:43:46 -0700 | [diff] [blame] | 1762 | d->d_un.d_val = reinterpret_cast<uintptr_t>(&_r_debug); |
Elliott Hughes | 99c3205 | 2013-01-14 09:56:21 -0800 | [diff] [blame] | 1763 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1764 | break; |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1765 | #endif |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1766 | #if defined(USE_RELA) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1767 | case DT_RELA: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1768 | si->rela = reinterpret_cast<ElfW(Rela)*>(base + d->d_un.d_ptr); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1769 | break; |
| 1770 | case DT_RELASZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1771 | si->rela_count = d->d_un.d_val / sizeof(ElfW(Rela)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1772 | break; |
| 1773 | case DT_REL: |
| 1774 | DL_ERR("unsupported DT_REL in \"%s\"", si->name); |
| 1775 | return false; |
| 1776 | case DT_RELSZ: |
| 1777 | DL_ERR("unsupported DT_RELSZ in \"%s\"", si->name); |
| 1778 | return false; |
| 1779 | #else |
| 1780 | case DT_REL: |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1781 | si->rel = reinterpret_cast<ElfW(Rel)*>(base + d->d_un.d_ptr); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1782 | break; |
| 1783 | case DT_RELSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1784 | si->rel_count = d->d_un.d_val / sizeof(ElfW(Rel)); |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1785 | break; |
Shin-ichiro KAWASAKI | ad13c57 | 2009-11-06 10:36:37 +0900 | [diff] [blame] | 1786 | case DT_RELA: |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1787 | DL_ERR("unsupported DT_RELA in \"%s\"", si->name); |
| 1788 | return false; |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1789 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1790 | case DT_INIT: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1791 | 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] | 1792 | 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] | 1793 | break; |
| 1794 | case DT_FINI: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1795 | 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] | 1796 | 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] | 1797 | break; |
| 1798 | case DT_INIT_ARRAY: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1799 | 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] | 1800 | 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] | 1801 | break; |
| 1802 | case DT_INIT_ARRAYSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1803 | 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] | 1804 | break; |
| 1805 | case DT_FINI_ARRAY: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1806 | 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] | 1807 | 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] | 1808 | break; |
| 1809 | case DT_FINI_ARRAYSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1810 | 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] | 1811 | break; |
| 1812 | case DT_PREINIT_ARRAY: |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1813 | 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] | 1814 | 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] | 1815 | break; |
| 1816 | case DT_PREINIT_ARRAYSZ: |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1817 | 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] | 1818 | break; |
| 1819 | case DT_TEXTREL: |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1820 | #if defined(__LP64__) |
| 1821 | DL_ERR("text relocations (DT_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); |
| 1822 | return false; |
| 1823 | #else |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1824 | si->has_text_relocations = true; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1825 | break; |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1826 | #endif |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1827 | case DT_SYMBOLIC: |
| 1828 | si->has_DT_SYMBOLIC = true; |
| 1829 | break; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1830 | case DT_NEEDED: |
| 1831 | ++needed_count; |
| 1832 | break; |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1833 | case DT_FLAGS: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1834 | if (d->d_un.d_val & DF_TEXTREL) { |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1835 | #if defined(__LP64__) |
| 1836 | DL_ERR("text relocations (DF_TEXTREL) found in 64-bit ELF file \"%s\"", si->name); |
| 1837 | return false; |
| 1838 | #else |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1839 | si->has_text_relocations = true; |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1840 | #endif |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1841 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1842 | if (d->d_un.d_val & DF_SYMBOLIC) { |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 1843 | si->has_DT_SYMBOLIC = true; |
| 1844 | } |
| 1845 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1846 | #if defined(__mips__) |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1847 | case DT_STRSZ: |
| 1848 | case DT_SYMENT: |
| 1849 | case DT_RELENT: |
| 1850 | break; |
| 1851 | case DT_MIPS_RLD_MAP: |
Elliott Hughes | bedfe38 | 2012-08-14 14:07:59 -0700 | [diff] [blame] | 1852 | // 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] | 1853 | { |
Benjamin Adolphi | 006f9ad | 2014-02-19 00:50:32 +0100 | [diff] [blame] | 1854 | 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] | 1855 | *dp = &_r_debug; |
| 1856 | } |
| 1857 | break; |
| 1858 | case DT_MIPS_RLD_VERSION: |
| 1859 | case DT_MIPS_FLAGS: |
| 1860 | case DT_MIPS_BASE_ADDRESS: |
| 1861 | case DT_MIPS_UNREFEXTNO: |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1862 | break; |
| 1863 | |
| 1864 | case DT_MIPS_SYMTABNO: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1865 | si->mips_symtabno = d->d_un.d_val; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1866 | break; |
| 1867 | |
| 1868 | case DT_MIPS_LOCAL_GOTNO: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1869 | si->mips_local_gotno = d->d_un.d_val; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1870 | break; |
| 1871 | |
| 1872 | case DT_MIPS_GOTSYM: |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1873 | si->mips_gotsym = d->d_un.d_val; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1874 | break; |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1875 | #endif |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1876 | |
| 1877 | default: |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1878 | DEBUG("Unused DT entry: type %p arg %p", |
| 1879 | 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] | 1880 | break; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1881 | } |
| 1882 | } |
| 1883 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1884 | DEBUG("si->base = %p, si->strtab = %p, si->symtab = %p", |
| 1885 | reinterpret_cast<void*>(si->base), si->strtab, si->symtab); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1886 | |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1887 | // Sanity checks. |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1888 | if (relocating_linker && needed_count != 0) { |
| 1889 | DL_ERR("linker cannot have DT_NEEDED dependencies on other libraries"); |
| 1890 | return false; |
| 1891 | } |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1892 | if (si->nbucket == 0) { |
| 1893 | DL_ERR("empty/missing DT_HASH in \"%s\" (built with --hash-style=gnu?)", si->name); |
| 1894 | return false; |
| 1895 | } |
| 1896 | if (si->strtab == 0) { |
| 1897 | DL_ERR("empty/missing DT_STRTAB in \"%s\"", si->name); |
| 1898 | return false; |
| 1899 | } |
| 1900 | if (si->symtab == 0) { |
| 1901 | DL_ERR("empty/missing DT_SYMTAB in \"%s\"", si->name); |
| 1902 | return false; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1903 | } |
| 1904 | |
Elliott Hughes | 7e5a8cc | 2013-06-18 13:15:00 -0700 | [diff] [blame] | 1905 | // 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] | 1906 | if (si->flags & FLAG_EXE) { |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 1907 | memset(g_ld_preloads, 0, sizeof(g_ld_preloads)); |
Elliott Hughes | 7e5a8cc | 2013-06-18 13:15:00 -0700 | [diff] [blame] | 1908 | size_t preload_count = 0; |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 1909 | for (size_t i = 0; g_ld_preload_names[i] != NULL; i++) { |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 1910 | soinfo* lsi = find_library(g_ld_preload_names[i], 0, NULL); |
Elliott Hughes | 7e5a8cc | 2013-06-18 13:15:00 -0700 | [diff] [blame] | 1911 | if (lsi != NULL) { |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 1912 | g_ld_preloads[preload_count++] = lsi; |
Elliott Hughes | 7e5a8cc | 2013-06-18 13:15:00 -0700 | [diff] [blame] | 1913 | } else { |
| 1914 | // As with glibc, failure to load an LD_PRELOAD library is just a warning. |
| 1915 | DL_WARN("could not load library \"%s\" from LD_PRELOAD for \"%s\"; caused by %s", |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 1916 | g_ld_preload_names[i], si->name, linker_get_error_buffer()); |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 1917 | } |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 1918 | } |
| 1919 | } |
| 1920 | |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1921 | soinfo** needed = reinterpret_cast<soinfo**>(alloca((1 + needed_count) * sizeof(soinfo*))); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1922 | soinfo** pneeded = needed; |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1923 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 1924 | for (ElfW(Dyn)* d = si->dynamic; d->d_tag != DT_NULL; ++d) { |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1925 | if (d->d_tag == DT_NEEDED) { |
| 1926 | const char* library_name = si->strtab + d->d_un.d_val; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1927 | DEBUG("%s needs %s", si->name, library_name); |
Dmitriy Ivanov | b648a8a | 2014-05-19 15:06:58 -0700 | [diff] [blame] | 1928 | soinfo* lsi = find_library(library_name, 0, NULL); |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 1929 | if (lsi == NULL) { |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 1930 | strlcpy(tmp_err_buf, linker_get_error_buffer(), sizeof(tmp_err_buf)); |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 1931 | 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] | 1932 | library_name, si->name, tmp_err_buf); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1933 | return false; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1934 | } |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 1935 | |
| 1936 | si->add_child(lsi); |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1937 | *pneeded++ = lsi; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1938 | } |
| 1939 | } |
Ard Biesheuvel | 12c78bb | 2012-08-14 12:30:09 +0200 | [diff] [blame] | 1940 | *pneeded = NULL; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1941 | |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1942 | #if !defined(__LP64__) |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1943 | if (si->has_text_relocations) { |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1944 | // Make segments writable to allow text relocations to work properly. We will later call |
| 1945 | // phdr_table_protect_segments() after all of them are applied and all constructors are run. |
Nick Kralevich | 3d4470c | 2013-10-22 12:06:36 -0700 | [diff] [blame] | 1946 | DL_WARN("%s has text relocations. This is wasting memory and prevents " |
| 1947 | "security hardening. Please fix.", si->name); |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1948 | if (phdr_table_unprotect_segments(si->phdr, si->phnum, si->load_bias) < 0) { |
| 1949 | DL_ERR("can't unprotect loadable segments for \"%s\": %s", |
| 1950 | si->name, strerror(errno)); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1951 | return false; |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1952 | } |
| 1953 | } |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1954 | #endif |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1955 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1956 | #if defined(USE_RELA) |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1957 | if (si->plt_rela != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1958 | DEBUG("[ relocating %s plt ]\n", si->name); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1959 | if (soinfo_relocate(si, si->plt_rela, si->plt_rela_count, needed)) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1960 | return false; |
| 1961 | } |
| 1962 | } |
| 1963 | if (si->rela != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1964 | DEBUG("[ relocating %s ]\n", si->name); |
Chris Dearman | 9918665 | 2014-02-06 20:36:51 -0800 | [diff] [blame] | 1965 | if (soinfo_relocate(si, si->rela, si->rela_count, needed)) { |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1966 | return false; |
| 1967 | } |
| 1968 | } |
| 1969 | #else |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1970 | if (si->plt_rel != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1971 | DEBUG("[ relocating %s plt ]", si->name); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1972 | if (soinfo_relocate(si, si->plt_rel, si->plt_rel_count, needed)) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1973 | return false; |
| 1974 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1975 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1976 | if (si->rel != NULL) { |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 1977 | DEBUG("[ relocating %s ]", si->name); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 1978 | if (soinfo_relocate(si, si->rel, si->rel_count, needed)) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1979 | return false; |
| 1980 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1981 | } |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 1982 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1983 | |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 1984 | #if defined(__mips__) |
Brian Carlstrom | 87c3585 | 2013-08-20 21:05:44 -0700 | [diff] [blame] | 1985 | if (!mips_relocate_got(si, needed)) { |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1986 | return false; |
Raghu Gandham | d7daacb | 2012-07-31 12:07:22 -0700 | [diff] [blame] | 1987 | } |
| 1988 | #endif |
| 1989 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1990 | si->flags |= FLAG_LINKED; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 1991 | DEBUG("[ finished linking %s ]", si->name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1992 | |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1993 | #if !defined(__LP64__) |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 1994 | if (si->has_text_relocations) { |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 1995 | // 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] | 1996 | if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) { |
| 1997 | DL_ERR("can't protect segments for \"%s\": %s", |
| 1998 | si->name, strerror(errno)); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 1999 | return false; |
Nick Kralevich | 5135b3a | 2012-08-10 21:08:42 -0700 | [diff] [blame] | 2000 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2001 | } |
Elliott Hughes | e4d792a | 2013-10-28 14:19:05 -0700 | [diff] [blame] | 2002 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2003 | |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 2004 | /* We can also turn on GNU RELRO protection */ |
| 2005 | 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] | 2006 | DL_ERR("can't enable GNU RELRO protection for \"%s\": %s", |
| 2007 | si->name, strerror(errno)); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 2008 | return false; |
Nick Kralevich | 9ec0f03 | 2012-02-28 10:40:00 -0800 | [diff] [blame] | 2009 | } |
| 2010 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 2011 | /* Handle serializing/sharing the RELRO segment */ |
| 2012 | if (extinfo && (extinfo->flags & ANDROID_DLEXT_WRITE_RELRO)) { |
| 2013 | if (phdr_table_serialize_gnu_relro(si->phdr, si->phnum, si->load_bias, |
| 2014 | extinfo->relro_fd) < 0) { |
| 2015 | DL_ERR("failed serializing GNU RELRO section for \"%s\": %s", |
| 2016 | si->name, strerror(errno)); |
| 2017 | return false; |
| 2018 | } |
| 2019 | } else if (extinfo && (extinfo->flags & ANDROID_DLEXT_USE_RELRO)) { |
| 2020 | if (phdr_table_map_gnu_relro(si->phdr, si->phnum, si->load_bias, |
| 2021 | extinfo->relro_fd) < 0) { |
| 2022 | DL_ERR("failed mapping GNU RELRO section for \"%s\": %s", |
| 2023 | si->name, strerror(errno)); |
| 2024 | return false; |
| 2025 | } |
| 2026 | } |
| 2027 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2028 | notify_gdb_of_load(si); |
Elliott Hughes | 124fae9 | 2012-10-31 14:20:03 -0700 | [diff] [blame] | 2029 | return true; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2030 | } |
| 2031 | |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2032 | /* |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 2033 | * This function add vdso to internal dso list. |
| 2034 | * It helps to stack unwinding through signal handlers. |
| 2035 | * Also, it makes bionic more like glibc. |
| 2036 | */ |
Kito Cheng | 812fd42 | 2014-03-25 22:53:56 +0800 | [diff] [blame] | 2037 | static void add_vdso(KernelArgumentBlock& args __unused) { |
Elliott Hughes | 4eeb1f1 | 2013-10-25 17:38:02 -0700 | [diff] [blame] | 2038 | #if defined(AT_SYSINFO_EHDR) |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2039 | ElfW(Ehdr)* ehdr_vdso = reinterpret_cast<ElfW(Ehdr)*>(args.getauxval(AT_SYSINFO_EHDR)); |
| 2040 | if (ehdr_vdso == NULL) { |
| 2041 | return; |
| 2042 | } |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 2043 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 2044 | soinfo* si = soinfo_alloc("[vdso]", NULL); |
Sergey Melnikov | ebd506c | 2013-10-31 18:02:12 +0400 | [diff] [blame] | 2045 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2046 | si->phdr = reinterpret_cast<ElfW(Phdr)*>(reinterpret_cast<char*>(ehdr_vdso) + ehdr_vdso->e_phoff); |
| 2047 | si->phnum = ehdr_vdso->e_phnum; |
| 2048 | si->base = reinterpret_cast<ElfW(Addr)>(ehdr_vdso); |
| 2049 | si->size = phdr_table_get_load_size(si->phdr, si->phnum); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2050 | si->load_bias = get_elf_exec_load_bias(ehdr_vdso); |
Sergey Melnikov | ebd506c | 2013-10-31 18:02:12 +0400 | [diff] [blame] | 2051 | |
Torne (Richard Coles) | 0dcf06f | 2014-04-22 11:59:26 +0100 | [diff] [blame] | 2052 | soinfo_link_image(si, NULL); |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 2053 | #endif |
| 2054 | } |
| 2055 | |
| 2056 | /* |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 2057 | * This is linker soinfo for GDB. See details below. |
| 2058 | */ |
| 2059 | static soinfo linker_soinfo_for_gdb; |
| 2060 | |
| 2061 | /* gdb expects the linker to be in the debug shared object list. |
| 2062 | * Without this, gdb has trouble locating the linker's ".text" |
| 2063 | * and ".plt" sections. Gdb could also potentially use this to |
| 2064 | * relocate the offset of our exported 'rtld_db_dlactivity' symbol. |
| 2065 | * Don't use soinfo_alloc(), because the linker shouldn't |
| 2066 | * be on the soinfo list. |
| 2067 | */ |
| 2068 | static void init_linker_info_for_gdb(ElfW(Addr) linker_base) { |
| 2069 | #if defined(__LP64__) |
| 2070 | strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker64", sizeof(linker_soinfo_for_gdb.name)); |
| 2071 | #else |
| 2072 | strlcpy(linker_soinfo_for_gdb.name, "/system/bin/linker", sizeof(linker_soinfo_for_gdb.name)); |
| 2073 | #endif |
| 2074 | linker_soinfo_for_gdb.flags = FLAG_NEW_SOINFO; |
| 2075 | linker_soinfo_for_gdb.base = linker_base; |
| 2076 | |
| 2077 | /* |
| 2078 | * Set the dynamic field in the link map otherwise gdb will complain with |
| 2079 | * the following: |
| 2080 | * warning: .dynamic section for "/system/bin/linker" is not at the |
| 2081 | * expected address (wrong library or version mismatch?) |
| 2082 | */ |
| 2083 | ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_base); |
| 2084 | ElfW(Phdr)* phdr = reinterpret_cast<ElfW(Phdr)*>(linker_base + elf_hdr->e_phoff); |
| 2085 | phdr_table_get_dynamic_section(phdr, elf_hdr->e_phnum, linker_base, |
| 2086 | &linker_soinfo_for_gdb.dynamic, NULL, NULL); |
| 2087 | insert_soinfo_into_debug_map(&linker_soinfo_for_gdb); |
| 2088 | } |
| 2089 | |
| 2090 | /* |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2091 | * This code is called after the linker has linked itself and |
| 2092 | * fixed it's own GOT. It is safe to make references to externs |
| 2093 | * and other non-local data at this point. |
| 2094 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2095 | 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] | 2096 | /* NOTE: we store the args pointer on a special location |
David 'Digit' Turner | ef0bd18 | 2009-07-17 17:55:01 +0200 | [diff] [blame] | 2097 | * of the temporary TLS area in order to pass it to |
| 2098 | * the C Library's runtime initializer. |
| 2099 | * |
| 2100 | * The initializer must clear the slot and reset the TLS |
| 2101 | * to point to a different location to ensure that no other |
| 2102 | * shared library constructor can access it. |
| 2103 | */ |
Elliott Hughes | d3920b3 | 2013-02-07 18:39:34 -0800 | [diff] [blame] | 2104 | __libc_init_tls(args); |
Evgeniy Stepanov | 1a78fbb | 2012-03-22 18:01:53 +0400 | [diff] [blame] | 2105 | |
Evgeniy Stepanov | 1a78fbb | 2012-03-22 18:01:53 +0400 | [diff] [blame] | 2106 | #if TIMING |
| 2107 | struct timeval t0, t1; |
| 2108 | gettimeofday(&t0, 0); |
| 2109 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2110 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 2111 | // Initialize environment functions, and get to the ELF aux vectors table. |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2112 | linker_env_init(args); |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 2113 | |
Nick Kralevich | 8d3e91d | 2013-04-25 13:15:24 -0700 | [diff] [blame] | 2114 | // If this is a setuid/setgid program, close the security hole described in |
| 2115 | // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc |
| 2116 | if (get_AT_SECURE()) { |
| 2117 | nullify_closed_stdio(); |
| 2118 | } |
| 2119 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2120 | debuggerd_init(); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2121 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 2122 | // Get a few environment variables. |
Elliott Hughes | 61a9ccb | 2012-11-02 12:37:13 -0700 | [diff] [blame] | 2123 | const char* LD_DEBUG = linker_env_get("LD_DEBUG"); |
| 2124 | if (LD_DEBUG != NULL) { |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 2125 | g_ld_debug_verbosity = atoi(LD_DEBUG); |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 2126 | } |
David 'Digit' Turner | be57559 | 2010-12-16 19:52:02 +0100 | [diff] [blame] | 2127 | |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 2128 | // Normally, these are cleaned by linker_env_init, but the test |
| 2129 | // doesn't cost us anything. |
| 2130 | const char* ldpath_env = NULL; |
| 2131 | const char* ldpreload_env = NULL; |
| 2132 | if (!get_AT_SECURE()) { |
| 2133 | ldpath_env = linker_env_get("LD_LIBRARY_PATH"); |
| 2134 | ldpreload_env = linker_env_get("LD_PRELOAD"); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2135 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2136 | |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2137 | INFO("[ android linker & debugger ]"); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2138 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 2139 | soinfo* si = soinfo_alloc(args.argv[0], NULL); |
Elliott Hughes | 18a206c | 2012-10-29 17:37:13 -0700 | [diff] [blame] | 2140 | if (si == NULL) { |
| 2141 | exit(EXIT_FAILURE); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2142 | } |
| 2143 | |
Nick Kralevich | d39c3ab | 2012-08-24 13:25:51 -0700 | [diff] [blame] | 2144 | /* 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] | 2145 | si->flags |= FLAG_EXE; |
Elliott Hughes | 3a9c5d6 | 2014-02-10 13:31:13 -0800 | [diff] [blame] | 2146 | link_map* map = &(si->link_map_head); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2147 | |
| 2148 | map->l_addr = 0; |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2149 | map->l_name = args.argv[0]; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2150 | map->l_prev = NULL; |
| 2151 | map->l_next = NULL; |
| 2152 | |
| 2153 | _r_debug.r_map = map; |
| 2154 | r_debug_tail = map; |
| 2155 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 2156 | init_linker_info_for_gdb(linker_base); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2157 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2158 | // Extract information passed from the kernel. |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2159 | si->phdr = reinterpret_cast<ElfW(Phdr)*>(args.getauxval(AT_PHDR)); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2160 | si->phnum = args.getauxval(AT_PHNUM); |
| 2161 | si->entry = args.getauxval(AT_ENTRY); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2162 | |
David 'Digit' Turner | 8180b08 | 2011-11-15 17:17:28 +0100 | [diff] [blame] | 2163 | /* Compute the value of si->base. We can't rely on the fact that |
| 2164 | * the first entry is the PHDR because this will not be true |
| 2165 | * for certain executables (e.g. some in the NDK unit test suite) |
| 2166 | */ |
David 'Digit' Turner | 8180b08 | 2011-11-15 17:17:28 +0100 | [diff] [blame] | 2167 | si->base = 0; |
David 'Digit' Turner | b52e438 | 2012-06-19 01:24:17 +0200 | [diff] [blame] | 2168 | si->size = phdr_table_get_load_size(si->phdr, si->phnum); |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2169 | si->load_bias = 0; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2170 | for (size_t i = 0; i < si->phnum; ++i) { |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2171 | if (si->phdr[i].p_type == PT_PHDR) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2172 | si->load_bias = reinterpret_cast<ElfW(Addr)>(si->phdr) - si->phdr[i].p_vaddr; |
| 2173 | 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] | 2174 | break; |
| 2175 | } |
David 'Digit' Turner | 8180b08 | 2011-11-15 17:17:28 +0100 | [diff] [blame] | 2176 | } |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2177 | si->dynamic = NULL; |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2178 | si->ref_count = 1; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2179 | |
Nick Kralevich | 2aebf54 | 2014-05-07 10:32:39 -0700 | [diff] [blame] | 2180 | ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base); |
| 2181 | if (elf_hdr->e_type != ET_DYN) { |
| 2182 | __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n"); |
| 2183 | exit(EXIT_FAILURE); |
| 2184 | } |
| 2185 | |
Elliott Hughes | 4688279 | 2012-08-03 16:49:39 -0700 | [diff] [blame] | 2186 | // Use LD_LIBRARY_PATH and LD_PRELOAD (but only if we aren't setuid/setgid). |
| 2187 | parse_LD_LIBRARY_PATH(ldpath_env); |
| 2188 | parse_LD_PRELOAD(ldpreload_env); |
Matt Fischer | 4fd42c1 | 2009-12-31 12:09:10 -0600 | [diff] [blame] | 2189 | |
Ard Biesheuvel | 5ae44f3 | 2012-08-30 12:48:32 +0200 | [diff] [blame] | 2190 | somain = si; |
| 2191 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 2192 | if (!soinfo_link_image(si, NULL)) { |
Elliott Hughes | 650be4e | 2013-03-05 18:47:58 -0800 | [diff] [blame] | 2193 | __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] | 2194 | exit(EXIT_FAILURE); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2195 | } |
| 2196 | |
Sergey Melnikov | c45087b | 2013-01-25 16:40:13 +0400 | [diff] [blame] | 2197 | add_vdso(args); |
| 2198 | |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 2199 | si->CallPreInitConstructors(); |
Evgeniy Stepanov | 9181a5d | 2012-08-13 17:58:37 +0400 | [diff] [blame] | 2200 | |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 2201 | for (size_t i = 0; g_ld_preloads[i] != NULL; ++i) { |
| 2202 | g_ld_preloads[i]->CallConstructors(); |
Kito Cheng | 326e85e | 2012-07-15 00:49:27 +0800 | [diff] [blame] | 2203 | } |
| 2204 | |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2205 | /* After the link_image, the si->load_bias is initialized. |
| 2206 | * For so lib, the map->l_addr will be updated in notify_gdb_of_load. |
| 2207 | * We need to update this value for so exe here. So Unwind_Backtrace |
| 2208 | * for some arch like x86 could work correctly within so exe. |
Xiaokang Qin | 9c3449e | 2012-09-13 18:07:24 +0800 | [diff] [blame] | 2209 | */ |
Chao-Ying Fu | c5db969 | 2012-11-15 02:00:17 -0800 | [diff] [blame] | 2210 | map->l_addr = si->load_bias; |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 2211 | si->CallConstructors(); |
Evgeniy Stepanov | e83c56d | 2011-12-21 13:03:54 +0400 | [diff] [blame] | 2212 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2213 | #if TIMING |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2214 | gettimeofday(&t1, NULL); |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2215 | 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] | 2216 | (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) - |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2217 | (((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] | 2218 | #endif |
| 2219 | #if STATS |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2220 | 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] | 2221 | linker_stats.count[kRelocAbsolute], |
| 2222 | linker_stats.count[kRelocRelative], |
| 2223 | linker_stats.count[kRelocCopy], |
| 2224 | linker_stats.count[kRelocSymbol]); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2225 | #endif |
| 2226 | #if COUNT_PAGES |
| 2227 | { |
| 2228 | unsigned n; |
| 2229 | unsigned i; |
| 2230 | unsigned count = 0; |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2231 | for (n = 0; n < 4096; n++) { |
| 2232 | if (bitmask[n]) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2233 | unsigned x = bitmask[n]; |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 2234 | #if defined(__LP64__) |
| 2235 | for (i = 0; i < 32; i++) { |
| 2236 | #else |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2237 | for (i = 0; i < 8; i++) { |
Marcus Oakland | e365f9d | 2013-10-10 15:19:31 +0100 | [diff] [blame] | 2238 | #endif |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2239 | if (x & 1) { |
| 2240 | count++; |
| 2241 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2242 | x >>= 1; |
| 2243 | } |
| 2244 | } |
| 2245 | } |
Elliott Hughes | ca0c11b | 2013-03-12 10:40:45 -0700 | [diff] [blame] | 2246 | 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] | 2247 | } |
| 2248 | #endif |
| 2249 | |
| 2250 | #if TIMING || STATS || COUNT_PAGES |
| 2251 | fflush(stdout); |
| 2252 | #endif |
| 2253 | |
Elliott Hughes | c00f2cb | 2013-10-04 17:01:33 -0700 | [diff] [blame] | 2254 | 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] | 2255 | return si->entry; |
| 2256 | } |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2257 | |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2258 | /* Compute the load-bias of an existing executable. This shall only |
| 2259 | * be used to compute the load bias of an executable or shared library |
| 2260 | * that was loaded by the kernel itself. |
| 2261 | * |
| 2262 | * Input: |
| 2263 | * elf -> address of ELF header, assumed to be at the start of the file. |
| 2264 | * Return: |
| 2265 | * load bias, i.e. add the value of any p_vaddr in the file to get |
| 2266 | * the corresponding address in memory. |
| 2267 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2268 | static ElfW(Addr) get_elf_exec_load_bias(const ElfW(Ehdr)* elf) { |
| 2269 | ElfW(Addr) offset = elf->e_phoff; |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2270 | 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] | 2271 | const ElfW(Phdr)* phdr_end = phdr_table + elf->e_phnum; |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2272 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2273 | for (const ElfW(Phdr)* phdr = phdr_table; phdr < phdr_end; phdr++) { |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 2274 | if (phdr->p_type == PT_LOAD) { |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2275 | 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] | 2276 | } |
Kito Cheng | fa8c05d | 2013-03-12 14:58:06 +0800 | [diff] [blame] | 2277 | } |
| 2278 | return 0; |
David 'Digit' Turner | bea23e5 | 2012-06-18 23:38:46 +0200 | [diff] [blame] | 2279 | } |
| 2280 | |
Dmitriy Ivanov | 5febb0d | 2014-07-28 15:05:51 -0700 | [diff] [blame] | 2281 | extern "C" void _start(); |
| 2282 | |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2283 | /* |
| 2284 | * This is the entry point for the linker, called from begin.S. This |
| 2285 | * method is responsible for fixing the linker's own relocations, and |
| 2286 | * then calling __linker_init_post_relocation(). |
| 2287 | * |
| 2288 | * Because this method is called before the linker has fixed it's own |
| 2289 | * relocations, any attempt to reference an extern variable, extern |
| 2290 | * function, or other GOT reference will generate a segfault. |
| 2291 | */ |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2292 | extern "C" ElfW(Addr) __linker_init(void* raw_args) { |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 2293 | // Initialize static variables. |
| 2294 | solist = get_libdl_info(); |
| 2295 | sonext = get_libdl_info(); |
| 2296 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2297 | KernelArgumentBlock args(raw_args); |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2298 | |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2299 | ElfW(Addr) linker_addr = args.getauxval(AT_BASE); |
Dmitriy Ivanov | 5febb0d | 2014-07-28 15:05:51 -0700 | [diff] [blame] | 2300 | ElfW(Addr) entry_point = args.getauxval(AT_ENTRY); |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2301 | ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(linker_addr); |
Elliott Hughes | faf05ba | 2014-02-11 16:59:37 -0800 | [diff] [blame] | 2302 | 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] | 2303 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2304 | soinfo linker_so; |
| 2305 | memset(&linker_so, 0, sizeof(soinfo)); |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2306 | |
Dmitriy Ivanov | 5febb0d | 2014-07-28 15:05:51 -0700 | [diff] [blame] | 2307 | // If the linker is not acting as PT_INTERP entry_point is equal to |
| 2308 | // _start. Which means that the linker is running as an executable and |
| 2309 | // already linked by PT_INTERP. |
| 2310 | // |
| 2311 | // This happens when user tries to run 'adb shell /system/bin/linker' |
| 2312 | // see also https://code.google.com/p/android/issues/detail?id=63174 |
| 2313 | if (reinterpret_cast<ElfW(Addr)>(&_start) == entry_point) { |
| 2314 | __libc_fatal("This is %s, the helper program for shared library executables.\n", args.argv[0]); |
| 2315 | } |
| 2316 | |
Elliott Hughes | b93702a | 2013-12-21 16:07:45 -0800 | [diff] [blame] | 2317 | strcpy(linker_so.name, "[dynamic linker]"); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2318 | linker_so.base = linker_addr; |
| 2319 | linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum); |
| 2320 | linker_so.load_bias = get_elf_exec_load_bias(elf_hdr); |
Brian Carlstrom | d4ee82d | 2013-02-28 15:58:45 -0800 | [diff] [blame] | 2321 | linker_so.dynamic = NULL; |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2322 | linker_so.phdr = phdr; |
| 2323 | linker_so.phnum = elf_hdr->e_phnum; |
| 2324 | linker_so.flags |= FLAG_LINKER; |
Elliott Hughes | 5419b94 | 2012-10-16 15:54:46 -0700 | [diff] [blame] | 2325 | |
Torne (Richard Coles) | 183ad9d | 2014-02-27 13:18:00 +0000 | [diff] [blame] | 2326 | if (!soinfo_link_image(&linker_so, NULL)) { |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2327 | // It would be nice to print an error message, but if the linker |
| 2328 | // 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] | 2329 | // call write() (because it involves a GOT reference). We may as |
| 2330 | // well try though... |
| 2331 | const char* msg = "CANNOT LINK EXECUTABLE: "; |
| 2332 | write(2, msg, strlen(msg)); |
| 2333 | write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf)); |
| 2334 | write(2, "\n", 1); |
| 2335 | _exit(EXIT_FAILURE); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2336 | } |
Elliott Hughes | d23736e | 2012-11-01 15:16:56 -0700 | [diff] [blame] | 2337 | |
Dmitriy Ivanov | 5febb0d | 2014-07-28 15:05:51 -0700 | [diff] [blame] | 2338 | // Initialize the linker's own global variables |
Dmitriy Ivanov | 6554996 | 2014-07-24 15:33:25 -0700 | [diff] [blame] | 2339 | linker_so.CallConstructors(); |
| 2340 | |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2341 | // We have successfully fixed our own relocations. It's safe to run |
| 2342 | // the main part of the linker now. |
Elliott Hughes | 1728b23 | 2014-05-14 10:02:03 -0700 | [diff] [blame] | 2343 | args.abort_message_ptr = &g_abort_message; |
Elliott Hughes | 0266ae5 | 2014-02-10 17:46:57 -0800 | [diff] [blame] | 2344 | ElfW(Addr) start_address = __linker_init_post_relocation(args, linker_addr); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2345 | |
Dmitriy Ivanov | d59e500 | 2014-05-09 09:10:14 -0700 | [diff] [blame] | 2346 | protect_data(PROT_READ); |
Elliott Hughes | 42b2c6a | 2013-02-07 10:14:39 -0800 | [diff] [blame] | 2347 | |
| 2348 | // Return the address that the calling assembly stub should jump to. |
| 2349 | return start_address; |
Nick Kralevich | 468319c | 2011-11-11 15:53:17 -0800 | [diff] [blame] | 2350 | } |