Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1 | #define _GNU_SOURCE |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 2 | #include <stdio.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <string.h> |
| 5 | #include <unistd.h> |
| 6 | #include <stdint.h> |
| 7 | #include <elf.h> |
| 8 | #include <sys/mman.h> |
| 9 | #include <limits.h> |
| 10 | #include <stdint.h> |
| 11 | #include <fcntl.h> |
| 12 | #include <sys/stat.h> |
| 13 | #include <errno.h> |
| 14 | #include <limits.h> |
| 15 | #include <elf.h> |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 16 | #include <setjmp.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 17 | #include <pthread.h> |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 18 | #include <ctype.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 19 | #include <dlfcn.h> |
Rich Felker | 8431d79 | 2012-10-04 16:35:46 -0400 | [diff] [blame] | 20 | #include "pthread_impl.h" |
| 21 | #include "libc.h" |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 22 | |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 23 | static int errflag; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 24 | static char errbuf[128]; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 25 | |
Rich Felker | e864a29 | 2012-07-11 01:47:30 -0400 | [diff] [blame] | 26 | #ifdef SHARED |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 27 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 28 | #if ULONG_MAX == 0xffffffff |
| 29 | typedef Elf32_Ehdr Ehdr; |
| 30 | typedef Elf32_Phdr Phdr; |
| 31 | typedef Elf32_Sym Sym; |
| 32 | #define R_TYPE(x) ((x)&255) |
| 33 | #define R_SYM(x) ((x)>>8) |
| 34 | #else |
| 35 | typedef Elf64_Ehdr Ehdr; |
| 36 | typedef Elf64_Phdr Phdr; |
| 37 | typedef Elf64_Sym Sym; |
| 38 | #define R_TYPE(x) ((x)&0xffffffff) |
| 39 | #define R_SYM(x) ((x)>>32) |
| 40 | #endif |
| 41 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 42 | #define MAXP2(a,b) (-(-(a)&-(b))) |
| 43 | #define ALIGN(x,y) ((x)+(y)-1 & -(y)) |
| 44 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 45 | struct debug { |
| 46 | int ver; |
| 47 | void *head; |
| 48 | void (*bp)(void); |
| 49 | int state; |
| 50 | void *base; |
| 51 | }; |
| 52 | |
| 53 | struct dso { |
| 54 | unsigned char *base; |
| 55 | char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 56 | size_t *dynv; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 57 | struct dso *next, *prev; |
| 58 | |
| 59 | int refcnt; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 60 | Sym *syms; |
Rich Felker | 596d60c | 2011-06-18 22:52:01 -0400 | [diff] [blame] | 61 | uint32_t *hashtab; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 62 | uint32_t *ghashtab; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 63 | char *strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 64 | unsigned char *map; |
| 65 | size_t map_len; |
| 66 | dev_t dev; |
| 67 | ino_t ino; |
Rich Felker | 6343ac8 | 2012-06-09 21:20:44 -0400 | [diff] [blame] | 68 | signed char global; |
Rich Felker | 700a815 | 2012-02-07 20:29:29 -0500 | [diff] [blame] | 69 | char relocated; |
| 70 | char constructed; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 71 | struct dso **deps; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 72 | void *tls_image; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 73 | size_t tls_len, tls_size, tls_align, tls_id, tls_offset; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 74 | void **new_dtv; |
| 75 | unsigned char *new_tls; |
| 76 | int new_dtv_idx, new_tls_idx; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 77 | struct dso *fini_next; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 78 | char *shortname; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 79 | char buf[]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 80 | }; |
| 81 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 82 | struct symdef { |
| 83 | Sym *sym; |
| 84 | struct dso *dso; |
| 85 | }; |
| 86 | |
Rich Felker | 59f4086 | 2012-08-05 13:46:39 -0400 | [diff] [blame] | 87 | #include "reloc.h" |
| 88 | |
Rich Felker | 58aa5f4 | 2012-05-03 20:42:45 -0400 | [diff] [blame] | 89 | void __init_ssp(size_t *); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 90 | void *__install_initial_tls(void *); |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 91 | |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 92 | static struct dso *head, *tail, *ldso, *fini_head; |
Rich Felker | 191ebca | 2011-06-30 23:02:27 -0400 | [diff] [blame] | 93 | static char *env_path, *sys_path, *r_path; |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 94 | static int ssp_used; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 95 | static int runtime; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 96 | static int ldd_mode; |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 97 | static int ldso_fail; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 98 | static jmp_buf rtld_fail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 99 | static pthread_rwlock_t lock; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 100 | static struct debug debug; |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 101 | static size_t *auxv; |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 102 | static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 103 | static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 104 | |
| 105 | struct debug *_dl_debug_addr = &debug; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 106 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 107 | #define AUX_CNT 38 |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 108 | #define DYN_CNT 34 |
| 109 | |
| 110 | static void decode_vec(size_t *v, size_t *a, size_t cnt) |
| 111 | { |
| 112 | memset(a, 0, cnt*sizeof(size_t)); |
| 113 | for (; v[0]; v+=2) if (v[0]<cnt) { |
| 114 | a[0] |= 1ULL<<v[0]; |
| 115 | a[v[0]] = v[1]; |
| 116 | } |
| 117 | } |
| 118 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 119 | static int search_vec(size_t *v, size_t *r, size_t key) |
| 120 | { |
| 121 | for (; v[0]!=key; v+=2) |
| 122 | if (!v[0]) return 0; |
| 123 | *r = v[1]; |
| 124 | return 1; |
| 125 | } |
| 126 | |
| 127 | static uint32_t sysv_hash(const char *s0) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 128 | { |
Rich Felker | 2adf2fb | 2012-01-17 00:34:58 -0500 | [diff] [blame] | 129 | const unsigned char *s = (void *)s0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 130 | uint_fast32_t h = 0; |
| 131 | while (*s) { |
| 132 | h = 16*h + *s++; |
| 133 | h ^= h>>24 & 0xf0; |
| 134 | } |
| 135 | return h & 0xfffffff; |
| 136 | } |
| 137 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 138 | static uint32_t gnu_hash(const char *s0) |
| 139 | { |
| 140 | const unsigned char *s = (void *)s0; |
| 141 | uint_fast32_t h = 5381; |
| 142 | for (; *s; s++) |
| 143 | h = h*33 + *s; |
| 144 | return h; |
| 145 | } |
| 146 | |
| 147 | static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 148 | { |
| 149 | size_t i; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 150 | Sym *syms = dso->syms; |
| 151 | uint32_t *hashtab = dso->hashtab; |
| 152 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 153 | for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) { |
| 154 | if (!strcmp(s, strings+syms[i].st_name)) |
| 155 | return syms+i; |
| 156 | } |
| 157 | return 0; |
| 158 | } |
| 159 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 160 | static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso) |
| 161 | { |
| 162 | Sym *sym; |
| 163 | char *strings; |
| 164 | uint32_t *hashtab = dso->ghashtab; |
| 165 | uint32_t nbuckets = hashtab[0]; |
| 166 | uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4); |
| 167 | uint32_t h2; |
| 168 | uint32_t *hashval; |
| 169 | uint32_t n = buckets[h1 % nbuckets]; |
| 170 | |
| 171 | if (!n) return 0; |
| 172 | |
| 173 | strings = dso->strings; |
| 174 | sym = dso->syms + n; |
| 175 | hashval = buckets + nbuckets + (n - hashtab[1]); |
| 176 | |
| 177 | for (h1 |= 1; ; sym++) { |
| 178 | h2 = *hashval++; |
| 179 | if ((h1 == (h2|1)) && !strcmp(s, strings + sym->st_name)) |
| 180 | return sym; |
| 181 | if (h2 & 1) break; |
| 182 | } |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 187 | #define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS) |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 188 | #define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 189 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 190 | static struct symdef find_sym(struct dso *dso, const char *s, int need_def) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 191 | { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 192 | uint32_t h = 0, gh = 0; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 193 | struct symdef def = {0}; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 194 | if (dso->ghashtab) { |
| 195 | gh = gnu_hash(s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 196 | if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1; |
| 197 | } else { |
| 198 | h = sysv_hash(s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 199 | if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1; |
| 200 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 201 | for (; dso; dso=dso->next) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 202 | Sym *sym; |
| 203 | if (!dso->global) continue; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 204 | if (dso->ghashtab) { |
| 205 | if (!gh) gh = gnu_hash(s); |
| 206 | sym = gnu_lookup(s, gh, dso); |
| 207 | } else { |
| 208 | if (!h) h = sysv_hash(s); |
| 209 | sym = sysv_lookup(s, h, dso); |
| 210 | } |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 211 | if (!sym) continue; |
| 212 | if (!sym->st_shndx) |
| 213 | if (need_def || (sym->st_info&0xf) == STT_TLS) |
| 214 | continue; |
| 215 | if (!sym->st_value) |
| 216 | if ((sym->st_info&0xf) != STT_TLS) |
| 217 | continue; |
| 218 | if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue; |
| 219 | if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue; |
| 220 | |
| 221 | if (def.sym && sym->st_info>>4 == STB_WEAK) continue; |
| 222 | def.sym = sym; |
| 223 | def.dso = dso; |
| 224 | if (sym->st_info>>4 == STB_GLOBAL) break; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 225 | } |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 226 | return def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 227 | } |
| 228 | |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 229 | static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 230 | { |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 231 | unsigned char *base = dso->base; |
| 232 | Sym *syms = dso->syms; |
| 233 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 234 | Sym *sym; |
| 235 | const char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 236 | void *ctx; |
| 237 | int type; |
| 238 | int sym_index; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 239 | struct symdef def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 240 | |
| 241 | for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 242 | type = R_TYPE(rel[1]); |
| 243 | sym_index = R_SYM(rel[1]); |
| 244 | if (sym_index) { |
| 245 | sym = syms + sym_index; |
| 246 | name = strings + sym->st_name; |
Rich Felker | 7cb44cd | 2012-08-05 02:44:32 -0400 | [diff] [blame] | 247 | ctx = IS_COPY(type) ? head->next : head; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 248 | def = find_sym(ctx, name, IS_PLT(type)); |
| 249 | if (!def.sym && sym->st_info>>4 != STB_WEAK) { |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 250 | snprintf(errbuf, sizeof errbuf, |
| 251 | "Error relocating %s: %s: symbol not found", |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 252 | dso->name, name); |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 253 | if (runtime) longjmp(rtld_fail, 1); |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 254 | dprintf(2, "%s\n", errbuf); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 255 | ldso_fail = 1; |
| 256 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 257 | } |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 258 | } else { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 259 | sym = 0; |
| 260 | def.sym = 0; |
| 261 | def.dso = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 262 | } |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 263 | do_single_reloc(dso, base, (void *)(base + rel[0]), type, |
| 264 | stride>2 ? rel[2] : 0, sym, sym?sym->st_size:0, def, |
| 265 | def.sym?(size_t)(def.dso->base+def.sym->st_value):0); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 266 | } |
| 267 | } |
| 268 | |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 269 | /* A huge hack: to make up for the wastefulness of shared libraries |
| 270 | * needing at least a page of dirty memory even if they have no global |
| 271 | * data, we reclaim the gaps at the beginning and end of writable maps |
| 272 | * and "donate" them to the heap by setting up minimal malloc |
| 273 | * structures and then freeing them. */ |
| 274 | |
| 275 | static void reclaim(unsigned char *base, size_t start, size_t end) |
| 276 | { |
| 277 | size_t *a, *z; |
| 278 | start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t); |
| 279 | end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t); |
| 280 | if (start>end || end-start < 4*sizeof(size_t)) return; |
| 281 | a = (size_t *)(base + start); |
| 282 | z = (size_t *)(base + end); |
| 283 | a[-2] = 1; |
| 284 | a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; |
| 285 | z[1] = 1; |
| 286 | free(a); |
| 287 | } |
| 288 | |
| 289 | static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt) |
| 290 | { |
| 291 | for (; phcnt--; ph=(void *)((char *)ph+phent)) { |
| 292 | if (ph->p_type!=PT_LOAD) continue; |
| 293 | if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue; |
| 294 | reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr); |
| 295 | reclaim(base, ph->p_vaddr+ph->p_memsz, |
| 296 | ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE); |
| 297 | } |
| 298 | } |
| 299 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 300 | static void *map_library(int fd, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 301 | { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 302 | Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 303 | size_t phsize; |
| 304 | size_t addr_min=SIZE_MAX, addr_max=0, map_len; |
| 305 | size_t this_min, this_max; |
| 306 | off_t off_start; |
| 307 | Ehdr *eh; |
| 308 | Phdr *ph; |
| 309 | unsigned prot; |
| 310 | unsigned char *map, *base; |
| 311 | size_t dyn; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 312 | size_t tls_image=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 313 | size_t i; |
| 314 | |
| 315 | ssize_t l = read(fd, buf, sizeof buf); |
| 316 | if (l<sizeof *eh) return 0; |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 317 | eh = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 318 | phsize = eh->e_phentsize * eh->e_phnum; |
| 319 | if (phsize + sizeof *eh > l) return 0; |
| 320 | if (eh->e_phoff + phsize > l) { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 321 | l = pread(fd, buf+1, phsize, eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 322 | if (l != phsize) return 0; |
| 323 | eh->e_phoff = sizeof *eh; |
| 324 | } |
| 325 | ph = (void *)((char *)buf + eh->e_phoff); |
| 326 | for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { |
| 327 | if (ph->p_type == PT_DYNAMIC) |
| 328 | dyn = ph->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 329 | if (ph->p_type == PT_TLS) { |
| 330 | tls_image = ph->p_vaddr; |
| 331 | dso->tls_align = ph->p_align; |
| 332 | dso->tls_len = ph->p_filesz; |
| 333 | dso->tls_size = ph->p_memsz; |
| 334 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 335 | if (ph->p_type != PT_LOAD) continue; |
| 336 | if (ph->p_vaddr < addr_min) { |
| 337 | addr_min = ph->p_vaddr; |
| 338 | off_start = ph->p_offset; |
| 339 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 340 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 341 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 342 | } |
| 343 | if (ph->p_vaddr+ph->p_memsz > addr_max) { |
| 344 | addr_max = ph->p_vaddr+ph->p_memsz; |
| 345 | } |
| 346 | } |
| 347 | if (!dyn) return 0; |
| 348 | addr_max += PAGE_SIZE-1; |
| 349 | addr_max &= -PAGE_SIZE; |
| 350 | addr_min &= -PAGE_SIZE; |
| 351 | off_start &= -PAGE_SIZE; |
| 352 | map_len = addr_max - addr_min + off_start; |
| 353 | /* The first time, we map too much, possibly even more than |
| 354 | * the length of the file. This is okay because we will not |
| 355 | * use the invalid part; we just need to reserve the right |
| 356 | * amount of virtual address space to map over later. */ |
Rich Felker | bf30100 | 2011-06-28 14:20:41 -0400 | [diff] [blame] | 357 | map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 358 | if (map==MAP_FAILED) return 0; |
| 359 | base = map - addr_min; |
| 360 | ph = (void *)((char *)buf + eh->e_phoff); |
| 361 | for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { |
| 362 | if (ph->p_type != PT_LOAD) continue; |
| 363 | /* Reuse the existing mapping for the lowest-address LOAD */ |
| 364 | if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue; |
| 365 | this_min = ph->p_vaddr & -PAGE_SIZE; |
| 366 | this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; |
| 367 | off_start = ph->p_offset & -PAGE_SIZE; |
| 368 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 369 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 370 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 371 | if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED) |
| 372 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 373 | if (ph->p_memsz > ph->p_filesz) { |
| 374 | size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; |
| 375 | size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; |
| 376 | memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 377 | if (pgbrk-(size_t)base < this_max && mmap((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED) |
| 378 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 379 | } |
| 380 | } |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 381 | for (i=0; ((size_t *)(base+dyn))[i]; i+=2) |
| 382 | if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 383 | if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0) |
| 384 | goto error; |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 385 | break; |
| 386 | } |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 387 | if (!runtime) reclaim_gaps(base, (void *)((char *)buf + eh->e_phoff), |
| 388 | eh->e_phentsize, eh->e_phnum); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 389 | dso->map = map; |
| 390 | dso->map_len = map_len; |
| 391 | dso->base = base; |
| 392 | dso->dynv = (void *)(base+dyn); |
| 393 | if (dso->tls_size) dso->tls_image = (void *)(base+tls_image); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 394 | return map; |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 395 | error: |
| 396 | munmap(map, map_len); |
| 397 | return 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 398 | } |
| 399 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 400 | static int path_open(const char *name, const char *search, char *buf, size_t buf_size) |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 401 | { |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 402 | const char *s=search, *z; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 403 | int l, fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 404 | for (;;) { |
| 405 | while (*s==':') s++; |
| 406 | if (!*s) return -1; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 407 | z = strchr(s, ':'); |
| 408 | l = z ? z-s : strlen(s); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 409 | snprintf(buf, buf_size, "%.*s/%s", l, s, name); |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 410 | if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 411 | s += l; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 412 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 413 | } |
| 414 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 415 | static void decode_dyn(struct dso *p) |
| 416 | { |
| 417 | size_t dyn[DYN_CNT] = {0}; |
| 418 | decode_vec(p->dynv, dyn, DYN_CNT); |
| 419 | p->syms = (void *)(p->base + dyn[DT_SYMTAB]); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 420 | p->strings = (void *)(p->base + dyn[DT_STRTAB]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 421 | if (dyn[0]&(1<<DT_HASH)) |
| 422 | p->hashtab = (void *)(p->base + dyn[DT_HASH]); |
| 423 | if (search_vec(p->dynv, dyn, DT_GNU_HASH)) |
| 424 | p->ghashtab = (void *)(p->base + *dyn); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 425 | } |
| 426 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 427 | static struct dso *load_library(const char *name) |
| 428 | { |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 429 | char buf[2*NAME_MAX+2]; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 430 | const char *pathname; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 431 | unsigned char *base, *map; |
| 432 | size_t dyno, map_len; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 433 | struct dso *p, temp_dso = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 434 | int fd; |
| 435 | struct stat st; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 436 | size_t alloc_size; |
| 437 | int n_th = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 438 | |
| 439 | /* Catch and block attempts to reload the implementation itself */ |
| 440 | if (name[0]=='l' && name[1]=='i' && name[2]=='b') { |
| 441 | static const char *rp, reserved[] = |
| 442 | "c\0pthread\0rt\0m\0dl\0util\0xnet\0"; |
| 443 | char *z = strchr(name, '.'); |
| 444 | if (z) { |
| 445 | size_t l = z-name; |
| 446 | for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1); |
| 447 | if (*rp) { |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 448 | if (!ldso->prev) { |
| 449 | tail->next = ldso; |
| 450 | ldso->prev = tail; |
| 451 | tail = ldso->next ? ldso->next : ldso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 452 | } |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 453 | return ldso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 454 | } |
| 455 | } |
| 456 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 457 | if (strchr(name, '/')) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 458 | pathname = name; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 459 | fd = open(name, O_RDONLY|O_CLOEXEC); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 460 | } else { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 461 | /* Search for the name to see if it's already loaded */ |
| 462 | for (p=head->next; p; p=p->next) { |
| 463 | if (p->shortname && !strcmp(p->shortname, name)) { |
| 464 | p->refcnt++; |
| 465 | return p; |
| 466 | } |
| 467 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 468 | if (strlen(name) > NAME_MAX) return 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 469 | fd = -1; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 470 | if (r_path) fd = path_open(name, r_path, buf, sizeof buf); |
| 471 | if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 472 | if (fd < 0) { |
| 473 | if (!sys_path) { |
Rich Felker | d712dd3 | 2012-09-29 18:14:46 -0400 | [diff] [blame] | 474 | FILE *f = fopen(ETC_LDSO_PATH, "rbe"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 475 | if (f) { |
| 476 | if (getline(&sys_path, (size_t[1]){0}, f) > 0) |
| 477 | sys_path[strlen(sys_path)-1]=0; |
| 478 | fclose(f); |
| 479 | } |
| 480 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 481 | if (sys_path) fd = path_open(name, sys_path, buf, sizeof buf); |
| 482 | else fd = path_open(name, "/lib:/usr/local/lib:/usr/lib", buf, sizeof buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 483 | } |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 484 | pathname = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 485 | } |
| 486 | if (fd < 0) return 0; |
| 487 | if (fstat(fd, &st) < 0) { |
| 488 | close(fd); |
| 489 | return 0; |
| 490 | } |
| 491 | for (p=head->next; p; p=p->next) { |
| 492 | if (p->dev == st.st_dev && p->ino == st.st_ino) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 493 | /* If this library was previously loaded with a |
| 494 | * pathname but a search found the same inode, |
| 495 | * setup its shortname so it can be found by name. */ |
Rich Felker | 5f88c0e | 2012-10-05 12:09:54 -0400 | [diff] [blame] | 496 | if (!p->shortname && pathname != name) |
| 497 | p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 498 | close(fd); |
| 499 | p->refcnt++; |
| 500 | return p; |
| 501 | } |
| 502 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 503 | map = map_library(fd, &temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 504 | close(fd); |
| 505 | if (!map) return 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 506 | |
| 507 | /* Allocate storage for the new DSO. When there is TLS, this |
| 508 | * storage must include a reservation for all pre-existing |
| 509 | * threads to obtain copies of both the new TLS, and an |
| 510 | * extended DTV capable of storing an additional slot for |
| 511 | * the newly-loaded DSO. */ |
| 512 | alloc_size = sizeof *p + strlen(pathname) + 1; |
| 513 | if (runtime && temp_dso.tls_image) { |
| 514 | size_t per_th = temp_dso.tls_size + temp_dso.tls_align |
| 515 | + sizeof(void *) * (tls_cnt+3); |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 516 | n_th = libc.threads_minus_1 + 1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 517 | if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; |
| 518 | else alloc_size += n_th * per_th; |
| 519 | } |
| 520 | p = calloc(1, alloc_size); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 521 | if (!p) { |
| 522 | munmap(map, map_len); |
| 523 | return 0; |
| 524 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 525 | memcpy(p, &temp_dso, sizeof temp_dso); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 526 | decode_dyn(p); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 527 | p->dev = st.st_dev; |
| 528 | p->ino = st.st_ino; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 529 | p->refcnt = 1; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 530 | p->name = p->buf; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 531 | strcpy(p->name, pathname); |
| 532 | /* Add a shortname only if name arg was not an explicit pathname. */ |
| 533 | if (pathname != name) p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 534 | if (p->tls_image) { |
Rich Felker | 017bf14 | 2012-10-07 20:19:11 -0400 | [diff] [blame] | 535 | if (runtime && !__pthread_self_init()) { |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 536 | free(p); |
| 537 | munmap(map, map_len); |
| 538 | return 0; |
| 539 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 540 | p->tls_id = ++tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 541 | tls_align = MAXP2(tls_align, p->tls_align); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 542 | #ifdef TLS_ABOVE_TP |
| 543 | p->tls_offset = tls_offset + ( (tls_align-1) & |
| 544 | -(tls_offset + (uintptr_t)p->tls_image) ); |
| 545 | tls_offset += p->tls_size; |
| 546 | #else |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 547 | tls_offset += p->tls_size + p->tls_align - 1; |
| 548 | tls_offset -= (tls_offset + (uintptr_t)p->tls_image) |
| 549 | & (p->tls_align-1); |
| 550 | p->tls_offset = tls_offset; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 551 | #endif |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 552 | p->new_dtv = (void *)(-sizeof(size_t) & |
| 553 | (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); |
| 554 | p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); |
| 555 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 556 | |
| 557 | tail->next = p; |
| 558 | p->prev = tail; |
| 559 | tail = p; |
| 560 | |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 561 | if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, base); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 562 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 563 | return p; |
| 564 | } |
| 565 | |
| 566 | static void load_deps(struct dso *p) |
| 567 | { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 568 | size_t i, ndeps=0; |
| 569 | struct dso ***deps = &p->deps, **tmp, *dep; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 570 | for (; p; p=p->next) { |
| 571 | for (i=0; p->dynv[i]; i+=2) { |
Rich Felker | 191ebca | 2011-06-30 23:02:27 -0400 | [diff] [blame] | 572 | if (p->dynv[i] != DT_RPATH) continue; |
| 573 | r_path = (void *)(p->strings + p->dynv[i+1]); |
| 574 | } |
| 575 | for (i=0; p->dynv[i]; i+=2) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 576 | if (p->dynv[i] != DT_NEEDED) continue; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 577 | dep = load_library(p->strings + p->dynv[i+1]); |
| 578 | if (!dep) { |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 579 | snprintf(errbuf, sizeof errbuf, |
| 580 | "Error loading shared library %s: %m (needed by %s)", |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 581 | p->strings + p->dynv[i+1], p->name); |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 582 | if (runtime) longjmp(rtld_fail, 1); |
| 583 | dprintf(2, "%s\n", errbuf); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 584 | ldso_fail = 1; |
| 585 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 586 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 587 | if (runtime) { |
| 588 | tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); |
| 589 | if (!tmp) longjmp(rtld_fail, 1); |
| 590 | tmp[ndeps++] = dep; |
| 591 | tmp[ndeps] = 0; |
| 592 | *deps = tmp; |
| 593 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 594 | } |
Rich Felker | 191ebca | 2011-06-30 23:02:27 -0400 | [diff] [blame] | 595 | r_path = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 596 | } |
| 597 | } |
| 598 | |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 599 | static void load_preload(char *s) |
| 600 | { |
| 601 | int tmp; |
| 602 | char *z; |
| 603 | for (z=s; *z; s=z) { |
| 604 | for ( ; *s && isspace(*s); s++); |
| 605 | for (z=s; *z && !isspace(*z); z++); |
| 606 | tmp = *z; |
| 607 | *z = 0; |
| 608 | load_library(s); |
| 609 | *z = tmp; |
| 610 | } |
| 611 | } |
| 612 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 613 | static void make_global(struct dso *p) |
| 614 | { |
| 615 | for (; p; p=p->next) p->global = 1; |
| 616 | } |
| 617 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 618 | static void reloc_all(struct dso *p) |
| 619 | { |
| 620 | size_t dyn[DYN_CNT] = {0}; |
| 621 | for (; p; p=p->next) { |
| 622 | if (p->relocated) continue; |
| 623 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | babf820 | 2012-08-05 12:50:26 -0400 | [diff] [blame] | 624 | #ifdef NEED_ARCH_RELOCS |
| 625 | do_arch_relocs(p, head); |
| 626 | #endif |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 627 | do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], |
| 628 | 2+(dyn[DT_PLTREL]==DT_RELA)); |
| 629 | do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2); |
| 630 | do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3); |
Rich Felker | 368ba4a | 2011-06-25 00:18:19 -0400 | [diff] [blame] | 631 | p->relocated = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 632 | } |
| 633 | } |
| 634 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 635 | static size_t find_dyn(Phdr *ph, size_t cnt, size_t stride) |
| 636 | { |
| 637 | for (; cnt--; ph = (void *)((char *)ph + stride)) |
| 638 | if (ph->p_type == PT_DYNAMIC) |
| 639 | return ph->p_vaddr; |
| 640 | return 0; |
| 641 | } |
| 642 | |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 643 | static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p) |
| 644 | { |
| 645 | size_t min_addr = -1, max_addr = 0; |
| 646 | for (; cnt--; ph = (void *)((char *)ph + stride)) { |
| 647 | if (ph->p_type != PT_LOAD) continue; |
| 648 | if (ph->p_vaddr < min_addr) |
| 649 | min_addr = ph->p_vaddr; |
| 650 | if (ph->p_vaddr+ph->p_memsz > max_addr) |
| 651 | max_addr = ph->p_vaddr+ph->p_memsz; |
| 652 | } |
| 653 | min_addr &= -PAGE_SIZE; |
| 654 | max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE; |
| 655 | p->map = p->base + min_addr; |
| 656 | p->map_len = max_addr - min_addr; |
| 657 | } |
| 658 | |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 659 | static void do_fini() |
| 660 | { |
| 661 | struct dso *p; |
| 662 | size_t dyn[DYN_CNT] = {0}; |
| 663 | for (p=fini_head; p; p=p->fini_next) { |
| 664 | if (!p->constructed) continue; |
| 665 | decode_vec(p->dynv, dyn, DYN_CNT); |
| 666 | ((void (*)(void))(p->base + dyn[DT_FINI]))(); |
| 667 | } |
| 668 | } |
| 669 | |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 670 | static void do_init_fini(struct dso *p) |
| 671 | { |
| 672 | size_t dyn[DYN_CNT] = {0}; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 673 | int need_locking = libc.threads_minus_1; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 674 | /* Allow recursive calls that arise when a library calls |
| 675 | * dlopen from one of its constructors, but block any |
| 676 | * other threads until all ctors have finished. */ |
| 677 | if (need_locking) pthread_mutex_lock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 678 | for (; p; p=p->prev) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 679 | if (p->constructed) continue; |
| 680 | p->constructed = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 681 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 682 | if (dyn[0] & (1<<DT_FINI)) { |
| 683 | p->fini_next = fini_head; |
| 684 | fini_head = p; |
| 685 | } |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 686 | if (dyn[0] & (1<<DT_INIT)) |
| 687 | ((void (*)(void))(p->base + dyn[DT_INIT]))(); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 688 | } |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 689 | if (need_locking) pthread_mutex_unlock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 690 | } |
| 691 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 692 | void _dl_debug_state(void) |
| 693 | { |
| 694 | } |
| 695 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 696 | void *__copy_tls(unsigned char *mem) |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 697 | { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 698 | pthread_t td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 699 | struct dso *p; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 700 | |
| 701 | if (!tls_cnt) return mem; |
| 702 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 703 | void **dtv = (void *)mem; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 704 | dtv[0] = (void *)tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 705 | |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 706 | #ifdef TLS_ABOVE_TP |
| 707 | mem += sizeof(void *) * (tls_cnt+1); |
| 708 | mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1); |
| 709 | td = (pthread_t)mem; |
| 710 | mem += sizeof(struct pthread); |
| 711 | |
| 712 | for (p=head; p; p=p->next) { |
| 713 | if (!p->tls_id) continue; |
| 714 | dtv[p->tls_id] = mem + p->tls_offset; |
| 715 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
| 716 | } |
| 717 | #else |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 718 | mem += libc.tls_size - sizeof(struct pthread); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 719 | mem -= (uintptr_t)mem & (tls_align-1); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 720 | td = (pthread_t)mem; |
| 721 | |
| 722 | for (p=head; p; p=p->next) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 723 | if (!p->tls_id) continue; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 724 | dtv[p->tls_id] = mem - p->tls_offset; |
| 725 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 726 | } |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 727 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 728 | td->dtv = dtv; |
| 729 | return td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 730 | } |
| 731 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 732 | void *__tls_get_addr(size_t *v) |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 733 | { |
| 734 | pthread_t self = __pthread_self(); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 735 | if (self->dtv && v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) |
| 736 | return (char *)self->dtv[v[0]]+v[1]; |
| 737 | |
| 738 | /* Block signals to make accessing new TLS async-signal-safe */ |
| 739 | sigset_t set; |
Rich Felker | 00902c7 | 2012-10-06 23:57:51 -0400 | [diff] [blame] | 740 | pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 741 | if (self->dtv && v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) { |
| 742 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 743 | return (char *)self->dtv[v[0]]+v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 744 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 745 | |
| 746 | /* This is safe without any locks held because, if the caller |
| 747 | * is able to request the Nth entry of the DTV, the DSO list |
| 748 | * must be valid at least that far out and it was synchronized |
| 749 | * at program startup or by an already-completed call to dlopen. */ |
| 750 | struct dso *p; |
| 751 | for (p=head; p->tls_id != v[0]; p=p->next); |
| 752 | |
| 753 | /* Get new DTV space from new DSO if needed */ |
| 754 | if (!self->dtv || v[0] > (size_t)self->dtv[0]) { |
| 755 | void **newdtv = p->new_dtv + |
| 756 | (v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1); |
| 757 | if (self->dtv) memcpy(newdtv, self->dtv, |
| 758 | ((size_t)self->dtv[0]+1) * sizeof(void *)); |
| 759 | newdtv[0] = (void *)v[0]; |
| 760 | self->dtv = newdtv; |
| 761 | } |
| 762 | |
| 763 | /* Get new TLS memory from new DSO */ |
| 764 | unsigned char *mem = p->new_tls + |
| 765 | (p->tls_size + p->tls_align) * a_fetch_add(&p->new_tls_idx,1); |
| 766 | mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) & (p->tls_align-1); |
| 767 | self->dtv[v[0]] = mem; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 768 | memcpy(mem, p->tls_image, p->tls_len); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 769 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 770 | return mem + v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 771 | } |
| 772 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 773 | static void update_tls_size() |
| 774 | { |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 775 | libc.tls_size = ALIGN( |
| 776 | (1+tls_cnt) * sizeof(void *) + |
| 777 | tls_offset + |
| 778 | sizeof(struct pthread) + |
| 779 | tls_align * 2, |
| 780 | tls_align); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 781 | } |
| 782 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 783 | void *__dynlink(int argc, char **argv) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 784 | { |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 785 | size_t aux[AUX_CNT] = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 786 | size_t i; |
| 787 | Phdr *phdr; |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 788 | Ehdr *ehdr; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 789 | static struct dso builtin_dsos[3]; |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 790 | struct dso *const app = builtin_dsos+0; |
| 791 | struct dso *const lib = builtin_dsos+1; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 792 | struct dso *const vdso = builtin_dsos+2; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 793 | char *env_preload=0; |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 794 | size_t vdso_base; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 795 | |
| 796 | /* Find aux vector just past environ[] */ |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 797 | for (i=argc+1; argv[i]; i++) |
| 798 | if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16)) |
| 799 | env_path = argv[i]+16; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 800 | else if (!memcmp(argv[i], "LD_PRELOAD=", 11)) |
| 801 | env_preload = argv[i]+11; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 802 | auxv = (void *)(argv+i+1); |
| 803 | |
| 804 | decode_vec(auxv, aux, AUX_CNT); |
| 805 | |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 806 | /* Only trust user/env if kernel says we're not suid/sgid */ |
| 807 | if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] |
Rich Felker | a045883 | 2011-08-16 07:46:42 -0400 | [diff] [blame] | 808 | || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) { |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 809 | env_path = 0; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 810 | env_preload = 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 811 | } |
| 812 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 813 | /* If the dynamic linker was invoked as a program itself, AT_BASE |
| 814 | * will not be set. In that case, we assume the base address is |
| 815 | * the start of the page containing the PHDRs; I don't know any |
| 816 | * better approach... */ |
| 817 | if (!aux[AT_BASE]) { |
| 818 | aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE; |
| 819 | aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0; |
| 820 | } |
| 821 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 822 | /* The dynamic linker load address is passed by the kernel |
| 823 | * in the AUX vector, so this is easy. */ |
| 824 | lib->base = (void *)aux[AT_BASE]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 825 | lib->name = lib->shortname = "libc.so"; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 826 | lib->global = 1; |
| 827 | ehdr = (void *)lib->base; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 828 | find_map_range((void *)(aux[AT_BASE]+ehdr->e_phoff), |
| 829 | ehdr->e_phnum, ehdr->e_phentsize, lib); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 830 | lib->dynv = (void *)(lib->base + find_dyn( |
| 831 | (void *)(aux[AT_BASE]+ehdr->e_phoff), |
| 832 | ehdr->e_phnum, ehdr->e_phentsize)); |
| 833 | decode_dyn(lib); |
| 834 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 835 | if (aux[AT_PHDR]) { |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 836 | size_t interp_off = 0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 837 | size_t tls_image = 0; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 838 | /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */ |
| 839 | phdr = (void *)aux[AT_PHDR]; |
| 840 | for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { |
| 841 | if (phdr->p_type == PT_PHDR) |
| 842 | app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 843 | else if (phdr->p_type == PT_INTERP) |
| 844 | interp_off = (size_t)phdr->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 845 | else if (phdr->p_type == PT_TLS) { |
| 846 | tls_image = phdr->p_vaddr; |
| 847 | app->tls_len = phdr->p_filesz; |
| 848 | app->tls_size = phdr->p_memsz; |
| 849 | app->tls_align = phdr->p_align; |
| 850 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 851 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 852 | if (app->tls_size) app->tls_image = (char *)app->base + tls_image; |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 853 | if (interp_off) lib->name = (char *)app->base + interp_off; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 854 | app->name = argv[0]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 855 | app->dynv = (void *)(app->base + find_dyn( |
| 856 | (void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT])); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 857 | find_map_range((void *)aux[AT_PHDR], |
| 858 | aux[AT_PHNUM], aux[AT_PHENT], app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 859 | } else { |
| 860 | int fd; |
| 861 | char *ldname = argv[0]; |
| 862 | size_t dyno, l = strlen(ldname); |
| 863 | if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; |
| 864 | *argv++ = (void *)-1; |
| 865 | if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1; |
| 866 | if (!argv[0]) { |
| 867 | dprintf(2, "musl libc/dynamic program loader\n"); |
| 868 | dprintf(2, "usage: %s pathname%s\n", ldname, |
| 869 | ldd_mode ? "" : " [args]"); |
| 870 | _exit(1); |
| 871 | } |
| 872 | fd = open(argv[0], O_RDONLY); |
| 873 | if (fd < 0) { |
| 874 | dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); |
| 875 | _exit(1); |
| 876 | } |
| 877 | runtime = 1; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 878 | ehdr = (void *)map_library(fd, app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 879 | if (!ehdr) { |
| 880 | dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); |
| 881 | _exit(1); |
| 882 | } |
| 883 | runtime = 0; |
| 884 | close(fd); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 885 | lib->name = ldname; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 886 | app->name = argv[0]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 887 | aux[AT_ENTRY] = ehdr->e_entry; |
Rich Felker | e12fe65 | 2012-01-23 02:02:59 -0500 | [diff] [blame] | 888 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 889 | if (app->tls_size) { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 890 | app->tls_id = tls_cnt = 1; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 891 | #ifdef TLS_ABOVE_TP |
| 892 | app->tls_offset = 0; |
| 893 | tls_offset = app->tls_size |
| 894 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 895 | & (app->tls_align-1) ); |
| 896 | #else |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 897 | tls_offset = app->tls_offset = app->tls_size |
| 898 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 899 | & (app->tls_align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 900 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 901 | tls_align = MAXP2(tls_align, app->tls_align); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 902 | } |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 903 | app->global = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 904 | app->constructed = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 905 | decode_dyn(app); |
| 906 | |
| 907 | /* Attach to vdso, if provided by the kernel */ |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 908 | if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) { |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 909 | ehdr = (void *)vdso_base; |
| 910 | phdr = (void *)(vdso_base + ehdr->e_phoff); |
| 911 | for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { |
| 912 | if (phdr->p_type == PT_DYNAMIC) |
| 913 | vdso->dynv = (void *)(vdso_base + phdr->p_offset); |
| 914 | if (phdr->p_type == PT_LOAD) |
| 915 | vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); |
| 916 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 917 | vdso->name = vdso->shortname = "linux-gate.so.1"; |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 918 | vdso->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 919 | decode_dyn(vdso); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 920 | vdso->prev = lib; |
| 921 | lib->next = vdso; |
| 922 | } |
| 923 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 924 | /* Initial dso chain consists only of the app. We temporarily |
| 925 | * append the dynamic linker/libc so we can relocate it, then |
| 926 | * restore the initial chain in preparation for loading third |
| 927 | * party libraries (preload/needed). */ |
| 928 | head = tail = app; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 929 | ldso = lib; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 930 | app->next = lib; |
| 931 | reloc_all(lib); |
| 932 | app->next = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 933 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 934 | /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */ |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 935 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 936 | /* Donate unused parts of app and library mapping to malloc */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 937 | reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]); |
| 938 | ehdr = (void *)lib->base; |
| 939 | reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff), |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 940 | ehdr->e_phentsize, ehdr->e_phnum); |
| 941 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 942 | /* Load preload/needed libraries, add their symbols to the global |
Rich Felker | fd7015d | 2012-01-23 18:32:40 -0500 | [diff] [blame] | 943 | * namespace, and perform all remaining relocations. The main |
| 944 | * program must be relocated LAST since it may contain copy |
| 945 | * relocations which depend on libraries' relocations. */ |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 946 | if (env_preload) load_preload(env_preload); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 947 | load_deps(app); |
| 948 | make_global(app); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 949 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 950 | reloc_all(app->next); |
| 951 | reloc_all(app); |
| 952 | |
| 953 | update_tls_size(); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 954 | if (tls_cnt) { |
| 955 | struct dso *p; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 956 | void *mem = mmap(0, libc.tls_size, PROT_READ|PROT_WRITE, |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 957 | MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); |
| 958 | if (mem==MAP_FAILED || |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 959 | !__install_initial_tls(__copy_tls(mem))) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 960 | dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 961 | argv[0], libc.tls_size); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 962 | _exit(127); |
| 963 | } |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 964 | } |
| 965 | |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 966 | if (ldso_fail) _exit(127); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 967 | if (ldd_mode) _exit(0); |
| 968 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 969 | /* Switch to runtime mode: any further failures in the dynamic |
| 970 | * linker are a reportable failure rather than a fatal startup |
| 971 | * error. If the dynamic loader (dlopen) will not be used, free |
| 972 | * all memory used by the dynamic linker. */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 973 | runtime = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 974 | |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 975 | #ifndef DYNAMIC_IS_RO |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 976 | for (i=0; app->dynv[i]; i+=2) |
| 977 | if (app->dynv[i]==DT_DEBUG) |
| 978 | app->dynv[i+1] = (size_t)&debug; |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 979 | #endif |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 980 | debug.ver = 1; |
| 981 | debug.bp = _dl_debug_state; |
| 982 | debug.head = head; |
| 983 | debug.base = lib->base; |
| 984 | debug.state = 0; |
| 985 | _dl_debug_state(); |
| 986 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 987 | if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]); |
Rich Felker | 58aa5f4 | 2012-05-03 20:42:45 -0400 | [diff] [blame] | 988 | |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 989 | atexit(do_fini); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 990 | do_init_fini(tail); |
| 991 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 992 | errno = 0; |
| 993 | return (void *)aux[AT_ENTRY]; |
| 994 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 995 | |
| 996 | void *dlopen(const char *file, int mode) |
| 997 | { |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 998 | struct dso *volatile p, *orig_tail, *next; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 999 | size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1000 | size_t i; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1001 | int cs; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1002 | |
| 1003 | if (!file) return head; |
| 1004 | |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1005 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1006 | pthread_rwlock_wrlock(&lock); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1007 | __inhibit_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1008 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1009 | p = 0; |
| 1010 | orig_tls_cnt = tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1011 | orig_tls_offset = tls_offset; |
| 1012 | orig_tls_align = tls_align; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1013 | orig_tail = tail; |
| 1014 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1015 | if (setjmp(rtld_fail)) { |
| 1016 | /* Clean up anything new that was (partially) loaded */ |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1017 | if (p && p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1018 | if (p->deps[i]->global < 0) |
| 1019 | p->deps[i]->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1020 | for (p=orig_tail->next; p; p=next) { |
| 1021 | next = p->next; |
| 1022 | munmap(p->map, p->map_len); |
| 1023 | free(p->deps); |
| 1024 | free(p); |
| 1025 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1026 | tls_cnt = orig_tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1027 | tls_offset = orig_tls_offset; |
| 1028 | tls_align = orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1029 | tail = orig_tail; |
| 1030 | tail->next = 0; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1031 | p = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1032 | errflag = 1; |
| 1033 | goto end; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1034 | } else p = load_library(file); |
| 1035 | |
| 1036 | if (!p) { |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1037 | snprintf(errbuf, sizeof errbuf, |
| 1038 | "Error loading shared library %s: %m", file); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1039 | errflag = 1; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1040 | goto end; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1041 | } |
| 1042 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1043 | /* First load handling */ |
| 1044 | if (!p->deps) { |
| 1045 | load_deps(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1046 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1047 | if (!p->deps[i]->global) |
| 1048 | p->deps[i]->global = -1; |
| 1049 | if (!p->global) p->global = -1; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1050 | reloc_all(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1051 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1052 | if (p->deps[i]->global < 0) |
| 1053 | p->deps[i]->global = 0; |
| 1054 | if (p->global < 0) p->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1055 | } |
| 1056 | |
| 1057 | if (mode & RTLD_GLOBAL) { |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1058 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1059 | p->deps[i]->global = 1; |
| 1060 | p->global = 1; |
| 1061 | } |
| 1062 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1063 | update_tls_size(); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1064 | |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 1065 | if (ssp_used) __init_ssp(auxv); |
| 1066 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1067 | _dl_debug_state(); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1068 | orig_tail = tail; |
Rich Felker | 06933cc | 2011-06-26 22:09:32 -0400 | [diff] [blame] | 1069 | end: |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1070 | __release_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1071 | pthread_rwlock_unlock(&lock); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1072 | if (p) do_init_fini(orig_tail); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1073 | pthread_setcancelstate(cs, 0); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1074 | return p; |
| 1075 | } |
| 1076 | |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1077 | static void *do_dlsym(struct dso *p, const char *s, void *ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1078 | { |
| 1079 | size_t i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1080 | uint32_t h = 0, gh = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1081 | Sym *sym; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1082 | if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1083 | if (p == RTLD_DEFAULT) { |
| 1084 | p = head; |
| 1085 | } else if (p == RTLD_NEXT) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1086 | for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next); |
| 1087 | if (!p) p=head; |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1088 | p = p->next; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1089 | } |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1090 | struct symdef def = find_sym(p, s, 0); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1091 | if (!def.sym) goto failed; |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1092 | if ((def.sym->st_info&0xf) == STT_TLS) |
| 1093 | return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value}); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1094 | return def.dso->base + def.sym->st_value; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1095 | } |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1096 | if (p->ghashtab) { |
| 1097 | gh = gnu_hash(s); |
| 1098 | sym = gnu_lookup(s, gh, p); |
| 1099 | } else { |
| 1100 | h = sysv_hash(s); |
| 1101 | sym = sysv_lookup(s, h, p); |
| 1102 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1103 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1104 | return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1105 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1106 | return p->base + sym->st_value; |
| 1107 | if (p->deps) for (i=0; p->deps[i]; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1108 | if (p->deps[i]->ghashtab) { |
| 1109 | if (!gh) gh = gnu_hash(s); |
Rich Felker | a5d6199 | 2012-08-25 17:40:27 -0400 | [diff] [blame] | 1110 | sym = gnu_lookup(s, gh, p->deps[i]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1111 | } else { |
| 1112 | if (!h) h = sysv_hash(s); |
| 1113 | sym = sysv_lookup(s, h, p->deps[i]); |
| 1114 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1115 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1116 | return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1117 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1118 | return p->deps[i]->base + sym->st_value; |
| 1119 | } |
Rich Felker | 4027f4e | 2012-05-04 20:18:18 -0400 | [diff] [blame] | 1120 | failed: |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1121 | errflag = 1; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1122 | snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1123 | return 0; |
| 1124 | } |
| 1125 | |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1126 | int __dladdr(void *addr, Dl_info *info) |
| 1127 | { |
| 1128 | struct dso *p; |
| 1129 | Sym *sym; |
| 1130 | uint32_t nsym; |
| 1131 | char *strings; |
| 1132 | size_t i; |
| 1133 | void *best = 0; |
| 1134 | char *bestname; |
| 1135 | |
| 1136 | pthread_rwlock_rdlock(&lock); |
| 1137 | for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next); |
| 1138 | pthread_rwlock_unlock(&lock); |
| 1139 | |
| 1140 | if (!p) return 0; |
| 1141 | |
| 1142 | sym = p->syms; |
| 1143 | strings = p->strings; |
| 1144 | if (p->hashtab) { |
| 1145 | nsym = p->hashtab[1]; |
| 1146 | } else { |
| 1147 | uint32_t *buckets; |
| 1148 | uint32_t *hashval; |
| 1149 | buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); |
| 1150 | sym += p->ghashtab[1]; |
| 1151 | for (i = 0; i < p->ghashtab[0]; i++) { |
| 1152 | if (buckets[i] > nsym) |
| 1153 | nsym = buckets[i]; |
| 1154 | } |
| 1155 | if (nsym) { |
| 1156 | nsym -= p->ghashtab[1]; |
| 1157 | hashval = buckets + p->ghashtab[0] + nsym; |
| 1158 | do nsym++; |
| 1159 | while (!(*hashval++ & 1)); |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | for (; nsym; nsym--, sym++) { |
| 1164 | if (sym->st_shndx && sym->st_value |
| 1165 | && (1<<(sym->st_info&0xf) & OK_TYPES) |
| 1166 | && (1<<(sym->st_info>>4) & OK_BINDS)) { |
| 1167 | void *symaddr = p->base + sym->st_value; |
| 1168 | if (symaddr > addr || symaddr < best) |
| 1169 | continue; |
| 1170 | best = symaddr; |
| 1171 | bestname = strings + sym->st_name; |
| 1172 | if (addr == symaddr) |
| 1173 | break; |
| 1174 | } |
| 1175 | } |
| 1176 | |
| 1177 | if (!best) return 0; |
| 1178 | |
| 1179 | info->dli_fname = p->name; |
| 1180 | info->dli_fbase = p->base; |
| 1181 | info->dli_sname = bestname; |
| 1182 | info->dli_saddr = best; |
| 1183 | |
| 1184 | return 1; |
| 1185 | } |
| 1186 | |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1187 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1188 | { |
| 1189 | void *res; |
| 1190 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1191 | res = do_dlsym(p, s, ra); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1192 | pthread_rwlock_unlock(&lock); |
| 1193 | return res; |
| 1194 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1195 | #else |
| 1196 | void *dlopen(const char *file, int mode) |
| 1197 | { |
| 1198 | return 0; |
| 1199 | } |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1200 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1201 | { |
| 1202 | return 0; |
| 1203 | } |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1204 | int __dladdr (void *addr, Dl_info *info) |
| 1205 | { |
| 1206 | return 0; |
| 1207 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1208 | #endif |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1209 | |
| 1210 | char *dlerror() |
| 1211 | { |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1212 | if (!errflag) return 0; |
| 1213 | errflag = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1214 | return errbuf; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1215 | } |
| 1216 | |
| 1217 | int dlclose(void *p) |
| 1218 | { |
| 1219 | return 0; |
| 1220 | } |