nsz Git - musl/blob - src/ldso/dynlink.c

   1 #define _GNU_SOURCE
   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>
  16 #include <link.h>
  17 #include <setjmp.h>
  18 #include <pthread.h>
  19 #include <ctype.h>
  20 #include <dlfcn.h>
  21 #include "pthread_impl.h"
  22 #include "libc.h"
  23
  24 static int errflag;
  25 static char errbuf[128];
  26
  27 #ifdef SHARED
  28
  29 #if ULONG_MAX == 0xffffffff
  30 typedef Elf32_Ehdr Ehdr;
  31 typedef Elf32_Phdr Phdr;
  32 typedef Elf32_Sym Sym;
  33 #define R_TYPE(x) ((x)&255)
  34 #define R_SYM(x) ((x)>>8)
  35 #else
  36 typedef Elf64_Ehdr Ehdr;
  37 typedef Elf64_Phdr Phdr;
  38 typedef Elf64_Sym Sym;
  39 #define R_TYPE(x) ((x)&0xffffffff)
  40 #define R_SYM(x) ((x)>>32)
  41 #endif
  42
  43 #define MAXP2(a,b) (-(-(a)&-(b)))
  44 #define ALIGN(x,y) ((x)+(y)-1 & -(y))
  45
  46 struct debug {
  47         int ver;
  48         void *head;
  49         void (*bp)(void);
  50         int state;
  51         void *base;
  52 };
  53
  54 struct dso {
  55         unsigned char *base;
  56         char *name;
  57         size_t *dynv;
  58         struct dso *next, *prev;
  59
  60         Phdr *phdr;
  61         int phnum;
  62         int refcnt;
  63         Sym *syms;
  64         uint32_t *hashtab;
  65         uint32_t *ghashtab;
  66         char *strings;
  67         unsigned char *map;
  68         size_t map_len;
  69         dev_t dev;
  70         ino_t ino;
  71         signed char global;
  72         char relocated;
  73         char constructed;
  74         struct dso **deps;
  75         void *tls_image;
  76         size_t tls_len, tls_size, tls_align, tls_id, tls_offset;
  77         void **new_dtv;
  78         unsigned char *new_tls;
  79         int new_dtv_idx, new_tls_idx;
  80         struct dso *fini_next;
  81         char *shortname;
  82         char buf[];
  83 };
  84
  85 struct symdef {
  86         Sym *sym;
  87         struct dso *dso;
  88 };
  89
  90 #include "reloc.h"
  91
  92 void __init_ssp(size_t *);
  93 void *__install_initial_tls(void *);
  94 void __init_libc(char **, char *);
  95
  96 static struct dso *head, *tail, *ldso, *fini_head;
  97 static char *env_path, *sys_path, *r_path;
  98 static unsigned long long gencnt;
  99 static int ssp_used;
 100 static int runtime;
 101 static int ldd_mode;
 102 static int ldso_fail;
 103 static int noload;
 104 static jmp_buf *rtld_fail;
 105 static pthread_rwlock_t lock;
 106 static struct debug debug;
 107 static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t);
 108 static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE };
 109
 110 struct debug *_dl_debug_addr = &debug;
 111
 112 #define AUX_CNT 38
 113 #define DYN_CNT 34
 114
 115 static void decode_vec(size_t *v, size_t *a, size_t cnt)
 116 {
 117         memset(a, 0, cnt*sizeof(size_t));
 118         for (; v[0]; v+=2) if (v[0]<cnt) {
 119                 a[0] |= 1ULL<<v[0];
 120                 a[v[0]] = v[1];
 121         }
 122 }
 123
 124 static int search_vec(size_t *v, size_t *r, size_t key)
 125 {
 126         for (; v[0]!=key; v+=2)
 127                 if (!v[0]) return 0;
 128         *r = v[1];
 129         return 1;
 130 }
 131
 132 static uint32_t sysv_hash(const char *s0)
 133 {
 134         const unsigned char *s = (void *)s0;
 135         uint_fast32_t h = 0;
 136         while (*s) {
 137                 h = 16*h + *s++;
 138                 h ^= h>>24 & 0xf0;
 139         }
 140         return h & 0xfffffff;
 141 }
 142
 143 static uint32_t gnu_hash(const char *s0)
 144 {
 145         const unsigned char *s = (void *)s0;
 146         uint_fast32_t h = 5381;
 147         for (; *s; s++)
 148                 h = h*33 + *s;
 149         return h;
 150 }
 151
 152 static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
 153 {
 154         size_t i;
 155         Sym *syms = dso->syms;
 156         uint32_t *hashtab = dso->hashtab;
 157         char *strings = dso->strings;
 158         for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
 159                 if (!strcmp(s, strings+syms[i].st_name))
 160                         return syms+i;
 161         }
 162         return 0;
 163 }
 164
 165 static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
 166 {
 167         Sym *sym;
 168         char *strings;
 169         uint32_t *hashtab = dso->ghashtab;
 170         uint32_t nbuckets = hashtab[0];
 171         uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
 172         uint32_t h2;
 173         uint32_t *hashval;
 174         uint32_t n = buckets[h1 % nbuckets];
 175
 176         if (!n) return 0;
 177
 178         strings = dso->strings;
 179         sym = dso->syms + n;
 180         hashval = buckets + nbuckets + (n - hashtab[1]);
 181
 182         for (h1 |= 1; ; sym++) {
 183                 h2 = *hashval++;
 184                 if ((h1 == (h2|1)) && !strcmp(s, strings + sym->st_name))
 185                         return sym;
 186                 if (h2 & 1) break;
 187         }
 188
 189         return 0;
 190 }
 191
 192 #define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS)
 193 #define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE)
 194
 195 static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
 196 {
 197         uint32_t h = 0, gh = 0;
 198         struct symdef def = {0};
 199         if (dso->ghashtab) {
 200                 gh = gnu_hash(s);
 201                 if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
 202         } else {
 203                 h = sysv_hash(s);
 204                 if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
 205         }
 206         for (; dso; dso=dso->next) {
 207                 Sym *sym;
 208                 if (!dso->global) continue;
 209                 if (dso->ghashtab) {
 210                         if (!gh) gh = gnu_hash(s);
 211                         sym = gnu_lookup(s, gh, dso);
 212                 } else {
 213                         if (!h) h = sysv_hash(s);
 214                         sym = sysv_lookup(s, h, dso);
 215                 }
 216                 if (!sym) continue;
 217                 if (!sym->st_shndx)
 218                         if (need_def || (sym->st_info&0xf) == STT_TLS)
 219                                 continue;
 220                 if (!sym->st_value)
 221                         if ((sym->st_info&0xf) != STT_TLS)
 222                                 continue;
 223                 if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue;
 224                 if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue;
 225
 226                 if (def.sym && sym->st_info>>4 == STB_WEAK) continue;
 227                 def.sym = sym;
 228                 def.dso = dso;
 229                 if (sym->st_info>>4 == STB_GLOBAL) break;
 230         }
 231         return def;
 232 }
 233
 234 static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
 235 {
 236         unsigned char *base = dso->base;
 237         Sym *syms = dso->syms;
 238         char *strings = dso->strings;
 239         Sym *sym;
 240         const char *name;
 241         void *ctx;
 242         int type;
 243         int sym_index;
 244         struct symdef def;
 245
 246         for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
 247                 type = R_TYPE(rel[1]);
 248                 sym_index = R_SYM(rel[1]);
 249                 if (sym_index) {
 250                         sym = syms + sym_index;
 251                         name = strings + sym->st_name;
 252                         ctx = IS_COPY(type) ? head->next : head;
 253                         def = find_sym(ctx, name, IS_PLT(type));
 254                         if (!def.sym && sym->st_info>>4 != STB_WEAK) {
 255                                 snprintf(errbuf, sizeof errbuf,
 256                                         "Error relocating %s: %s: symbol not found",
 257                                         dso->name, name);
 258                                 if (runtime) longjmp(*rtld_fail, 1);
 259                                 dprintf(2, "%s\n", errbuf);
 260                                 ldso_fail = 1;
 261                                 continue;
 262                         }
 263                 } else {
 264                         sym = 0;
 265                         def.sym = 0;
 266                         def.dso = 0;
 267                 }
 268                 do_single_reloc(dso, base, (void *)(base + rel[0]), type,
 269                         stride>2 ? rel[2] : 0, sym, sym?sym->st_size:0, def,
 270                         def.sym?(size_t)(def.dso->base+def.sym->st_value):0);
 271         }
 272 }
 273
 274 /* A huge hack: to make up for the wastefulness of shared libraries
 275  * needing at least a page of dirty memory even if they have no global
 276  * data, we reclaim the gaps at the beginning and end of writable maps
 277  * and "donate" them to the heap by setting up minimal malloc
 278  * structures and then freeing them. */
 279
 280 static void reclaim(unsigned char *base, size_t start, size_t end)
 281 {
 282         size_t *a, *z;
 283         start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t);
 284         end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t);
 285         if (start>end || end-start < 4*sizeof(size_t)) return;
 286         a = (size_t *)(base + start);
 287         z = (size_t *)(base + end);
 288         a[-2] = 1;
 289         a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1;
 290         z[1] = 1;
 291         free(a);
 292 }
 293
 294 static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt)
 295 {
 296         for (; phcnt--; ph=(void *)((char *)ph+phent)) {
 297                 if (ph->p_type!=PT_LOAD) continue;
 298                 if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
 299                 reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
 300                 reclaim(base, ph->p_vaddr+ph->p_memsz,
 301                         ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
 302         }
 303 }
 304
 305 static void *map_library(int fd, struct dso *dso)
 306 {
 307         Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
 308         size_t phsize;
 309         size_t addr_min=SIZE_MAX, addr_max=0, map_len;
 310         size_t this_min, this_max;
 311         off_t off_start;
 312         Ehdr *eh;
 313         Phdr *ph, *ph0;
 314         unsigned prot;
 315         unsigned char *map, *base;
 316         size_t dyn;
 317         size_t tls_image=0;
 318         size_t i;
 319
 320         ssize_t l = read(fd, buf, sizeof buf);
 321         if (l<(int)sizeof *eh) return 0;
 322         eh = buf;
 323         phsize = eh->e_phentsize * eh->e_phnum;
 324         if (phsize + sizeof *eh > l) return 0;
 325         if (eh->e_phoff + phsize > l) {
 326                 l = pread(fd, buf+1, phsize, eh->e_phoff);
 327                 if (l != phsize) return 0;
 328                 ph = ph0 = (void *)(buf + 1);
 329         } else {
 330                 ph = ph0 = (void *)((char *)buf + eh->e_phoff);
 331         }
 332         for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
 333                 if (ph->p_type == PT_DYNAMIC)
 334                         dyn = ph->p_vaddr;
 335                 if (ph->p_type == PT_TLS) {
 336                         tls_image = ph->p_vaddr;
 337                         dso->tls_align = ph->p_align;
 338                         dso->tls_len = ph->p_filesz;
 339                         dso->tls_size = ph->p_memsz;
 340                 }
 341                 if (ph->p_type != PT_LOAD) continue;
 342                 if (ph->p_vaddr < addr_min) {
 343                         addr_min = ph->p_vaddr;
 344                         off_start = ph->p_offset;
 345                         prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
 346                                 ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
 347                                 ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
 348                 }
 349                 if (ph->p_vaddr+ph->p_memsz > addr_max) {
 350                         addr_max = ph->p_vaddr+ph->p_memsz;
 351                 }
 352         }
 353         if (!dyn) return 0;
 354         addr_max += PAGE_SIZE-1;
 355         addr_max &= -PAGE_SIZE;
 356         addr_min &= -PAGE_SIZE;
 357         off_start &= -PAGE_SIZE;
 358         map_len = addr_max - addr_min + off_start;
 359         /* The first time, we map too much, possibly even more than
 360          * the length of the file. This is okay because we will not
 361          * use the invalid part; we just need to reserve the right
 362          * amount of virtual address space to map over later. */
 363         map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
 364         if (map==MAP_FAILED) return 0;
 365         base = map - addr_min;
 366         dso->phdr = 0;
 367         dso->phnum = 0;
 368         for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
 369                 if (ph->p_type != PT_LOAD) continue;
 370                 /* Check if the programs headers are in this load segment, and
 371                  * if so, record the address for use by dl_iterate_phdr. */
 372                 if (!dso->phdr && eh->e_phoff >= ph->p_offset
 373                     && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) {
 374                         dso->phdr = (void *)(base + ph->p_vaddr
 375                                 + (eh->e_phoff-ph->p_offset));
 376                         dso->phnum = eh->e_phnum;
 377                 }
 378                 /* Reuse the existing mapping for the lowest-address LOAD */
 379                 if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
 380                 this_min = ph->p_vaddr & -PAGE_SIZE;
 381                 this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE;
 382                 off_start = ph->p_offset & -PAGE_SIZE;
 383                 prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
 384                         ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
 385                         ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
 386                 if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
 387                         goto error;
 388                 if (ph->p_memsz > ph->p_filesz) {
 389                         size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
 390                         size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE;
 391                         memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1);
 392                         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)
 393                                 goto error;
 394                 }
 395         }
 396         for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
 397                 if (((size_t *)(base+dyn))[i]==DT_TEXTREL) {
 398                         if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0)
 399                                 goto error;
 400                         break;
 401                 }
 402         if (!runtime) reclaim_gaps(base, ph0, eh->e_phentsize, eh->e_phnum);
 403         dso->map = map;
 404         dso->map_len = map_len;
 405         dso->base = base;
 406         dso->dynv = (void *)(base+dyn);
 407         if (dso->tls_size) dso->tls_image = (void *)(base+tls_image);
 408         return map;
 409 error:
 410         munmap(map, map_len);
 411         return 0;
 412 }
 413
 414 static int path_open(const char *name, const char *s, char *buf, size_t buf_size)
 415 {
 416         size_t l;
 417         int fd;
 418         for (;;) {
 419                 s += strspn(s, ":\n");
 420                 l = strcspn(s, ":\n");
 421                 if (l-1 >= INT_MAX) return -1;
 422                 if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size)
 423                         continue;
 424                 if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd;
 425                 s += l;
 426         }
 427 }
 428
 429 static void decode_dyn(struct dso *p)
 430 {
 431         size_t dyn[DYN_CNT] = {0};
 432         decode_vec(p->dynv, dyn, DYN_CNT);
 433         p->syms = (void *)(p->base + dyn[DT_SYMTAB]);
 434         p->strings = (void *)(p->base + dyn[DT_STRTAB]);
 435         if (dyn[0]&(1<<DT_HASH))
 436                 p->hashtab = (void *)(p->base + dyn[DT_HASH]);
 437         if (search_vec(p->dynv, dyn, DT_GNU_HASH))
 438                 p->ghashtab = (void *)(p->base + *dyn);
 439 }
 440
 441 static struct dso *load_library(const char *name)
 442 {
 443         char buf[2*NAME_MAX+2];
 444         const char *pathname;
 445         unsigned char *map;
 446         struct dso *p, temp_dso = {0};
 447         int fd;
 448         struct stat st;
 449         size_t alloc_size;
 450         int n_th = 0;
 451
 452         /* Catch and block attempts to reload the implementation itself */
 453         if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
 454                 static const char *rp, reserved[] =
 455                         "c\0pthread\0rt\0m\0dl\0util\0xnet\0";
 456                 char *z = strchr(name, '.');
 457                 if (z) {
 458                         size_t l = z-name;
 459                         for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1);
 460                         if (*rp) {
 461                                 if (ldd_mode) {
 462                                         /* Track which names have been resolved
 463                                          * and only report each one once. */
 464                                         static unsigned reported;
 465                                         unsigned mask = 1U<<(rp-reserved);
 466                                         if (!(reported & mask)) {
 467                                                 reported |= mask;
 468                                                 dprintf(1, "\t%s => %s (%p)\n",
 469                                                         name, ldso->name,
 470                                                         ldso->base);
 471                                         }
 472                                 }
 473                                 if (!ldso->prev) {
 474                                         tail->next = ldso;
 475                                         ldso->prev = tail;
 476                                         tail = ldso->next ? ldso->next : ldso;
 477                                 }
 478                                 return ldso;
 479                         }
 480                 }
 481         }
 482         if (strchr(name, '/')) {
 483                 pathname = name;
 484                 fd = open(name, O_RDONLY|O_CLOEXEC);
 485         } else {
 486                 /* Search for the name to see if it's already loaded */
 487                 for (p=head->next; p; p=p->next) {
 488                         if (p->shortname && !strcmp(p->shortname, name)) {
 489                                 p->refcnt++;
 490                                 return p;
 491                         }
 492                 }
 493                 if (strlen(name) > NAME_MAX) return 0;
 494                 fd = -1;
 495                 if (r_path) fd = path_open(name, r_path, buf, sizeof buf);
 496                 if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf);
 497                 if (fd < 0) {
 498                         if (!sys_path) {
 499                                 char *prefix = 0;
 500                                 size_t prefix_len;
 501                                 if (ldso->name[0]=='/') {
 502                                         char *s, *t, *z;
 503                                         for (s=t=z=ldso->name; *s; s++)
 504                                                 if (*s=='/') z=t, t=s;
 505                                         prefix_len = z-ldso->name;
 506                                         if (prefix_len < PATH_MAX)
 507                                                 prefix = ldso->name;
 508                                 }
 509                                 if (!prefix) {
 510                                         prefix = "";
 511                                         prefix_len = 0;
 512                                 }
 513                                 char etc_ldso_path[prefix_len + 1
 514                                         + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"];
 515                                 snprintf(etc_ldso_path, sizeof etc_ldso_path,
 516                                         "%.*s/etc/ld-musl-" LDSO_ARCH ".path",
 517                                         (int)prefix_len, prefix);
 518                                 FILE *f = fopen(etc_ldso_path, "rbe");
 519                                 if (f) {
 520                                         if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) {
 521                                                 free(sys_path);
 522                                                 sys_path = "";
 523                                         }
 524                                         fclose(f);
 525                                 }
 526                         }
 527                         if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib";
 528                         fd = path_open(name, sys_path, buf, sizeof buf);
 529                 }
 530                 pathname = buf;
 531         }
 532         if (fd < 0) return 0;
 533         if (fstat(fd, &st) < 0) {
 534                 close(fd);
 535                 return 0;
 536         }
 537         for (p=head->next; p; p=p->next) {
 538                 if (p->dev == st.st_dev && p->ino == st.st_ino) {
 539                         /* If this library was previously loaded with a
 540                          * pathname but a search found the same inode,
 541                          * setup its shortname so it can be found by name. */
 542                         if (!p->shortname && pathname != name)
 543                                 p->shortname = strrchr(p->name, '/')+1;
 544                         close(fd);
 545                         p->refcnt++;
 546                         return p;
 547                 }
 548         }
 549         map = noload ? 0 : map_library(fd, &temp_dso);
 550         close(fd);
 551         if (!map) return 0;
 552
 553         /* Allocate storage for the new DSO. When there is TLS, this
 554          * storage must include a reservation for all pre-existing
 555          * threads to obtain copies of both the new TLS, and an
 556          * extended DTV capable of storing an additional slot for
 557          * the newly-loaded DSO. */
 558         alloc_size = sizeof *p + strlen(pathname) + 1;
 559         if (runtime && temp_dso.tls_image) {
 560                 size_t per_th = temp_dso.tls_size + temp_dso.tls_align
 561                         + sizeof(void *) * (tls_cnt+3);
 562                 n_th = libc.threads_minus_1 + 1;
 563                 if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX;
 564                 else alloc_size += n_th * per_th;
 565         }
 566         p = calloc(1, alloc_size);
 567         if (!p) {
 568                 munmap(map, temp_dso.map_len);
 569                 return 0;
 570         }
 571         memcpy(p, &temp_dso, sizeof temp_dso);
 572         decode_dyn(p);
 573         p->dev = st.st_dev;
 574         p->ino = st.st_ino;
 575         p->refcnt = 1;
 576         p->name = p->buf;
 577         strcpy(p->name, pathname);
 578         /* Add a shortname only if name arg was not an explicit pathname. */
 579         if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
 580         if (p->tls_image) {
 581                 if (runtime && !__pthread_self_init()) {
 582                         munmap(map, p->map_len);
 583                         free(p);
 584                         return 0;
 585                 }
 586                 p->tls_id = ++tls_cnt;
 587                 tls_align = MAXP2(tls_align, p->tls_align);
 588 #ifdef TLS_ABOVE_TP
 589                 p->tls_offset = tls_offset + ( (tls_align-1) &
 590                         -(tls_offset + (uintptr_t)p->tls_image) );
 591                 tls_offset += p->tls_size;
 592 #else
 593                 tls_offset += p->tls_size + p->tls_align - 1;
 594                 tls_offset -= (tls_offset + (uintptr_t)p->tls_image)
 595                         & (p->tls_align-1);
 596                 p->tls_offset = tls_offset;
 597 #endif
 598                 p->new_dtv = (void *)(-sizeof(size_t) &
 599                         (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t)));
 600                 p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1));
 601         }
 602
 603         tail->next = p;
 604         p->prev = tail;
 605         tail = p;
 606
 607         if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base);
 608
 609         return p;
 610 }
 611
 612 static void load_deps(struct dso *p)
 613 {
 614         size_t i, ndeps=0;
 615         struct dso ***deps = &p->deps, **tmp, *dep;
 616         for (; p; p=p->next) {
 617                 for (i=0; p->dynv[i]; i+=2) {
 618                         if (p->dynv[i] != DT_RPATH) continue;
 619                         r_path = (void *)(p->strings + p->dynv[i+1]);
 620                 }
 621                 for (i=0; p->dynv[i]; i+=2) {
 622                         if (p->dynv[i] != DT_NEEDED) continue;
 623                         dep = load_library(p->strings + p->dynv[i+1]);
 624                         if (!dep) {
 625                                 snprintf(errbuf, sizeof errbuf,
 626                                         "Error loading shared library %s: %m (needed by %s)",
 627                                         p->strings + p->dynv[i+1], p->name);
 628                                 if (runtime) longjmp(*rtld_fail, 1);
 629                                 dprintf(2, "%s\n", errbuf);
 630                                 ldso_fail = 1;
 631                                 continue;
 632                         }
 633                         if (runtime) {
 634                                 tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2));
 635                                 if (!tmp) longjmp(*rtld_fail, 1);
 636                                 tmp[ndeps++] = dep;
 637                                 tmp[ndeps] = 0;
 638                                 *deps = tmp;
 639                         }
 640                 }
 641                 r_path = 0;
 642         }
 643 }
 644
 645 static void load_preload(char *s)
 646 {
 647         int tmp;
 648         char *z;
 649         for (z=s; *z; s=z) {
 650                 for (   ; *s && isspace(*s); s++);
 651                 for (z=s; *z && !isspace(*z); z++);
 652                 tmp = *z;
 653                 *z = 0;
 654                 load_library(s);
 655                 *z = tmp;
 656         }
 657 }
 658
 659 static void make_global(struct dso *p)
 660 {
 661         for (; p; p=p->next) p->global = 1;
 662 }
 663
 664 static void reloc_all(struct dso *p)
 665 {
 666         size_t dyn[DYN_CNT] = {0};
 667         for (; p; p=p->next) {
 668                 if (p->relocated) continue;
 669                 decode_vec(p->dynv, dyn, DYN_CNT);
 670 #ifdef NEED_ARCH_RELOCS
 671                 do_arch_relocs(p, head);
 672 #endif
 673                 do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
 674                         2+(dyn[DT_PLTREL]==DT_RELA));
 675                 do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
 676                 do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
 677                 p->relocated = 1;
 678         }
 679 }
 680
 681 static size_t find_dyn(Phdr *ph, size_t cnt, size_t stride)
 682 {
 683         for (; cnt--; ph = (void *)((char *)ph + stride))
 684                 if (ph->p_type == PT_DYNAMIC)
 685                         return ph->p_vaddr;
 686         return 0;
 687 }
 688
 689 static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p)
 690 {
 691         size_t min_addr = -1, max_addr = 0;
 692         for (; cnt--; ph = (void *)((char *)ph + stride)) {
 693                 if (ph->p_type != PT_LOAD) continue;
 694                 if (ph->p_vaddr < min_addr)
 695                         min_addr = ph->p_vaddr;
 696                 if (ph->p_vaddr+ph->p_memsz > max_addr)
 697                         max_addr = ph->p_vaddr+ph->p_memsz;
 698         }
 699         min_addr &= -PAGE_SIZE;
 700         max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE;
 701         p->map = p->base + min_addr;
 702         p->map_len = max_addr - min_addr;
 703 }
 704
 705 static void do_fini()
 706 {
 707         struct dso *p;
 708         size_t dyn[DYN_CNT] = {0};
 709         for (p=fini_head; p; p=p->fini_next) {
 710                 if (!p->constructed) continue;
 711                 decode_vec(p->dynv, dyn, DYN_CNT);
 712                 if (dyn[0] & (1<<DT_FINI_ARRAY)) {
 713                         size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t);
 714                         size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n;
 715                         while (n--) ((void (*)(void))*--fn)();
 716                 }
 717 #ifndef NO_LEGACY_INITFINI
 718                 if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI])
 719                         ((void (*)(void))(p->base + dyn[DT_FINI]))();
 720 #endif
 721         }
 722 }
 723
 724 static void do_init_fini(struct dso *p)
 725 {
 726         size_t dyn[DYN_CNT] = {0};
 727         int need_locking = libc.threads_minus_1;
 728         /* Allow recursive calls that arise when a library calls
 729          * dlopen from one of its constructors, but block any
 730          * other threads until all ctors have finished. */
 731         if (need_locking) pthread_mutex_lock(&init_fini_lock);
 732         for (; p; p=p->prev) {
 733                 if (p->constructed) continue;
 734                 p->constructed = 1;
 735                 decode_vec(p->dynv, dyn, DYN_CNT);
 736                 if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) {
 737                         p->fini_next = fini_head;
 738                         fini_head = p;
 739                 }
 740 #ifndef NO_LEGACY_INITFINI
 741                 if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
 742                         ((void (*)(void))(p->base + dyn[DT_INIT]))();
 743 #endif
 744                 if (dyn[0] & (1<<DT_INIT_ARRAY)) {
 745                         size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t);
 746                         size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]);
 747                         while (n--) ((void (*)(void))*fn++)();
 748                 }
 749                 if (!need_locking && libc.threads_minus_1) {
 750                         need_locking = 1;
 751                         pthread_mutex_lock(&init_fini_lock);
 752                 }
 753         }
 754         if (need_locking) pthread_mutex_unlock(&init_fini_lock);
 755 }
 756
 757 void _dl_debug_state(void)
 758 {
 759 }
 760
 761 void *__copy_tls(unsigned char *mem)
 762 {
 763         pthread_t td;
 764         struct dso *p;
 765
 766         if (!tls_cnt) return mem;
 767
 768         void **dtv = (void *)mem;
 769         dtv[0] = (void *)tls_cnt;
 770
 771 #ifdef TLS_ABOVE_TP
 772         mem += sizeof(void *) * (tls_cnt+1);
 773         mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1);
 774         td = (pthread_t)mem;
 775         mem += sizeof(struct pthread);
 776
 777         for (p=head; p; p=p->next) {
 778                 if (!p->tls_id) continue;
 779                 dtv[p->tls_id] = mem + p->tls_offset;
 780                 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
 781         }
 782 #else
 783         mem += libc.tls_size - sizeof(struct pthread);
 784         mem -= (uintptr_t)mem & (tls_align-1);
 785         td = (pthread_t)mem;
 786
 787         for (p=head; p; p=p->next) {
 788                 if (!p->tls_id) continue;
 789                 dtv[p->tls_id] = mem - p->tls_offset;
 790                 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
 791         }
 792 #endif
 793         td->dtv = dtv;
 794         return td;
 795 }
 796
 797 void *__tls_get_addr(size_t *v)
 798 {
 799         pthread_t self = __pthread_self();
 800         if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]])
 801                 return (char *)self->dtv[v[0]]+v[1];
 802
 803         /* Block signals to make accessing new TLS async-signal-safe */
 804         sigset_t set;
 805         pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set);
 806         if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) {
 807                 pthread_sigmask(SIG_SETMASK, &set, 0);
 808                 return (char *)self->dtv[v[0]]+v[1];
 809         }
 810
 811         /* This is safe without any locks held because, if the caller
 812          * is able to request the Nth entry of the DTV, the DSO list
 813          * must be valid at least that far out and it was synchronized
 814          * at program startup or by an already-completed call to dlopen. */
 815         struct dso *p;
 816         for (p=head; p->tls_id != v[0]; p=p->next);
 817
 818         /* Get new DTV space from new DSO if needed */
 819         if (v[0] > (size_t)self->dtv[0]) {
 820                 void **newdtv = p->new_dtv +
 821                         (v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1);
 822                 memcpy(newdtv, self->dtv,
 823                         ((size_t)self->dtv[0]+1) * sizeof(void *));
 824                 newdtv[0] = (void *)v[0];
 825                 self->dtv = newdtv;
 826         }
 827
 828         /* Get new TLS memory from new DSO */
 829         unsigned char *mem = p->new_tls +
 830                 (p->tls_size + p->tls_align) * a_fetch_add(&p->new_tls_idx,1);
 831         mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) & (p->tls_align-1);
 832         self->dtv[v[0]] = mem;
 833         memcpy(mem, p->tls_image, p->tls_len);
 834         pthread_sigmask(SIG_SETMASK, &set, 0);
 835         return mem + v[1];
 836 }
 837
 838 static void update_tls_size()
 839 {
 840         libc.tls_size = ALIGN(
 841                 (1+tls_cnt) * sizeof(void *) +
 842                 tls_offset +
 843                 sizeof(struct pthread) +
 844                 tls_align * 2,
 845         tls_align);
 846 }
 847
 848 void *__dynlink(int argc, char **argv)
 849 {
 850         size_t aux[AUX_CNT] = {0};
 851         size_t i;
 852         Phdr *phdr;
 853         Ehdr *ehdr;
 854         static struct dso builtin_dsos[3];
 855         struct dso *const app = builtin_dsos+0;
 856         struct dso *const lib = builtin_dsos+1;
 857         struct dso *const vdso = builtin_dsos+2;
 858         char *env_preload=0;
 859         size_t vdso_base;
 860         size_t *auxv;
 861         char **envp = argv+argc+1;
 862
 863         /* Find aux vector just past environ[] */
 864         for (i=argc+1; argv[i]; i++)
 865                 if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
 866                         env_path = argv[i]+16;
 867                 else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
 868                         env_preload = argv[i]+11;
 869         auxv = (void *)(argv+i+1);
 870
 871         decode_vec(auxv, aux, AUX_CNT);
 872
 873         /* Only trust user/env if kernel says we're not suid/sgid */
 874         if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
 875           || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
 876                 env_path = 0;
 877                 env_preload = 0;
 878         }
 879
 880         /* If the dynamic linker was invoked as a program itself, AT_BASE
 881          * will not be set. In that case, we assume the base address is
 882          * the start of the page containing the PHDRs; I don't know any
 883          * better approach... */
 884         if (!aux[AT_BASE]) {
 885                 aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE;
 886                 aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0;
 887         }
 888
 889         /* The dynamic linker load address is passed by the kernel
 890          * in the AUX vector, so this is easy. */
 891         lib->base = (void *)aux[AT_BASE];
 892         lib->name = lib->shortname = "libc.so";
 893         lib->global = 1;
 894         ehdr = (void *)lib->base;
 895         lib->phnum = ehdr->e_phnum;
 896         lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff);
 897         find_map_range(lib->phdr, ehdr->e_phnum, ehdr->e_phentsize, lib);
 898         lib->dynv = (void *)(lib->base + find_dyn(lib->phdr,
 899                 ehdr->e_phnum, ehdr->e_phentsize));
 900         decode_dyn(lib);
 901
 902         if (aux[AT_PHDR]) {
 903                 size_t interp_off = 0;
 904                 size_t tls_image = 0;
 905                 /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
 906                 app->phdr = phdr = (void *)aux[AT_PHDR];
 907                 app->phnum = aux[AT_PHNUM];
 908                 for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
 909                         if (phdr->p_type == PT_PHDR)
 910                                 app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
 911                         else if (phdr->p_type == PT_INTERP)
 912                                 interp_off = (size_t)phdr->p_vaddr;
 913                         else if (phdr->p_type == PT_TLS) {
 914                                 tls_image = phdr->p_vaddr;
 915                                 app->tls_len = phdr->p_filesz;
 916                                 app->tls_size = phdr->p_memsz;
 917                                 app->tls_align = phdr->p_align;
 918                         }
 919                 }
 920                 if (app->tls_size) app->tls_image = (char *)app->base + tls_image;
 921                 if (interp_off) lib->name = (char *)app->base + interp_off;
 922                 app->name = argv[0];
 923                 app->dynv = (void *)(app->base + find_dyn(
 924                         (void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
 925                 find_map_range((void *)aux[AT_PHDR],
 926                         aux[AT_PHNUM], aux[AT_PHENT], app);
 927         } else {
 928                 int fd;
 929                 char *ldname = argv[0];
 930                 size_t l = strlen(ldname);
 931                 if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
 932                 *argv++ = (void *)-1;
 933                 if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1;
 934                 if (!argv[0]) {
 935                         dprintf(2, "musl libc/dynamic program loader\n");
 936                         dprintf(2, "usage: %s pathname%s\n", ldname,
 937                                 ldd_mode ? "" : " [args]");
 938                         _exit(1);
 939                 }
 940                 fd = open(argv[0], O_RDONLY);
 941                 if (fd < 0) {
 942                         dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno));
 943                         _exit(1);
 944                 }
 945                 runtime = 1;
 946                 ehdr = (void *)map_library(fd, app);
 947                 if (!ehdr) {
 948                         dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
 949                         _exit(1);
 950                 }
 951                 runtime = 0;
 952                 close(fd);
 953                 lib->name = ldname;
 954                 app->name = argv[0];
 955                 aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry;
 956                 /* Find the name that would have been used for the dynamic
 957                  * linker had ldd not taken its place. */
 958                 if (ldd_mode) {
 959                         for (i=0; i<app->phnum; i++) {
 960                                 if (app->phdr[i].p_type == PT_INTERP)
 961                                         lib->name = (void *)(app->base
 962                                                 + app->phdr[i].p_vaddr);
 963                         }
 964                         dprintf(1, "\t%s (%p)\n", lib->name, lib->base);
 965                 }
 966         }
 967         if (app->tls_size) {
 968                 app->tls_id = tls_cnt = 1;
 969 #ifdef TLS_ABOVE_TP
 970                 app->tls_offset = 0;
 971                 tls_offset = app->tls_size
 972                         + ( -((uintptr_t)app->tls_image + app->tls_size)
 973                         & (app->tls_align-1) );
 974 #else
 975                 tls_offset = app->tls_offset = app->tls_size
 976                         + ( -((uintptr_t)app->tls_image + app->tls_size)
 977                         & (app->tls_align-1) );
 978 #endif
 979                 tls_align = MAXP2(tls_align, app->tls_align);
 980         }
 981         app->global = 1;
 982         decode_dyn(app);
 983
 984         /* Attach to vdso, if provided by the kernel */
 985         if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
 986                 ehdr = (void *)vdso_base;
 987                 vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff);
 988                 vdso->phnum = ehdr->e_phnum;
 989                 for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
 990                         if (phdr->p_type == PT_DYNAMIC)
 991                                 vdso->dynv = (void *)(vdso_base + phdr->p_offset);
 992                         if (phdr->p_type == PT_LOAD)
 993                                 vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
 994                 }
 995                 vdso->name = "";
 996                 vdso->shortname = "linux-gate.so.1";
 997                 vdso->global = 1;
 998                 decode_dyn(vdso);
 999                 vdso->prev = lib;
1000                 lib->next = vdso;
1001         }
1002
1003         /* Initial dso chain consists only of the app. We temporarily
1004          * append the dynamic linker/libc so we can relocate it, then
1005          * restore the initial chain in preparation for loading third
1006          * party libraries (preload/needed). */
1007         head = tail = app;
1008         ldso = lib;
1009         app->next = lib;
1010         reloc_all(lib);
1011         app->next = 0;
1012
1013         /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
1014
1015         /* Donate unused parts of app and library mapping to malloc */
1016         reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]);
1017         ehdr = (void *)lib->base;
1018         reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff),
1019                 ehdr->e_phentsize, ehdr->e_phnum);
1020
1021         /* Load preload/needed libraries, add their symbols to the global
1022          * namespace, and perform all remaining relocations. The main
1023          * program must be relocated LAST since it may contain copy
1024          * relocations which depend on libraries' relocations. */
1025         if (env_preload) load_preload(env_preload);
1026         load_deps(app);
1027         make_global(app);
1028
1029         reloc_all(app->next);
1030         reloc_all(app);
1031
1032         update_tls_size();
1033         if (tls_cnt) {
1034                 void *mem = mmap(0, libc.tls_size, PROT_READ|PROT_WRITE,
1035                         MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
1036                 if (mem==MAP_FAILED ||
1037                     !__install_initial_tls(__copy_tls(mem))) {
1038                         dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n",
1039                                 argv[0], libc.tls_size);
1040                         _exit(127);
1041                 }
1042         }
1043
1044         if (ldso_fail) _exit(127);
1045         if (ldd_mode) _exit(0);
1046
1047         /* Switch to runtime mode: any further failures in the dynamic
1048          * linker are a reportable failure rather than a fatal startup
1049          * error. If the dynamic loader (dlopen) will not be used, free
1050          * all memory used by the dynamic linker. */
1051         runtime = 1;
1052
1053 #ifndef DYNAMIC_IS_RO
1054         for (i=0; app->dynv[i]; i+=2)
1055                 if (app->dynv[i]==DT_DEBUG)
1056                         app->dynv[i+1] = (size_t)&debug;
1057 #endif
1058         debug.ver = 1;
1059         debug.bp = _dl_debug_state;
1060         debug.head = head;
1061         debug.base = lib->base;
1062         debug.state = 0;
1063         _dl_debug_state();
1064
1065         if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]);
1066         __init_libc(envp, argv[0]);
1067         atexit(do_fini);
1068         errno = 0;
1069         do_init_fini(tail);
1070
1071         return (void *)aux[AT_ENTRY];
1072 }
1073
1074 void *dlopen(const char *file, int mode)
1075 {
1076         struct dso *volatile p, *orig_tail, *next;
1077         size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
1078         size_t i;
1079         int cs;
1080         jmp_buf jb;
1081
1082         if (!file) return head;
1083
1084         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
1085         pthread_rwlock_wrlock(&lock);
1086         __inhibit_ptc();
1087
1088         p = 0;
1089         orig_tls_cnt = tls_cnt;
1090         orig_tls_offset = tls_offset;
1091         orig_tls_align = tls_align;
1092         orig_tail = tail;
1093         noload = mode & RTLD_NOLOAD;
1094
1095         rtld_fail = &jb;
1096         if (setjmp(*rtld_fail)) {
1097                 /* Clean up anything new that was (partially) loaded */
1098                 if (p && p->deps) for (i=0; p->deps[i]; i++)
1099                         if (p->deps[i]->global < 0)
1100                                 p->deps[i]->global = 0;
1101                 for (p=orig_tail->next; p; p=next) {
1102                         next = p->next;
1103                         munmap(p->map, p->map_len);
1104                         free(p->deps);
1105                         free(p);
1106                 }
1107                 tls_cnt = orig_tls_cnt;
1108                 tls_offset = orig_tls_offset;
1109                 tls_align = orig_tls_align;
1110                 tail = orig_tail;
1111                 tail->next = 0;
1112                 p = 0;
1113                 errflag = 1;
1114                 goto end;
1115         } else p = load_library(file);
1116
1117         if (!p) {
1118                 snprintf(errbuf, sizeof errbuf, noload ?
1119                         "Library %s is not already loaded" :
1120                         "Error loading shared library %s: %m",
1121                         file);
1122                 errflag = 1;
1123                 goto end;
1124         }
1125
1126         /* First load handling */
1127         if (!p->deps) {
1128                 load_deps(p);
1129                 if (p->deps) for (i=0; p->deps[i]; i++)
1130                         if (!p->deps[i]->global)
1131                                 p->deps[i]->global = -1;
1132                 if (!p->global) p->global = -1;
1133                 reloc_all(p);
1134                 if (p->deps) for (i=0; p->deps[i]; i++)
1135                         if (p->deps[i]->global < 0)
1136                                 p->deps[i]->global = 0;
1137                 if (p->global < 0) p->global = 0;
1138         }
1139
1140         if (mode & RTLD_GLOBAL) {
1141                 if (p->deps) for (i=0; p->deps[i]; i++)
1142                         p->deps[i]->global = 1;
1143                 p->global = 1;
1144         }
1145
1146         update_tls_size();
1147
1148         if (ssp_used) __init_ssp(libc.auxv);
1149
1150         _dl_debug_state();
1151         orig_tail = tail;
1152 end:
1153         __release_ptc();
1154         if (p) gencnt++;
1155         pthread_rwlock_unlock(&lock);
1156         if (p) do_init_fini(orig_tail);
1157         pthread_setcancelstate(cs, 0);
1158         return p;
1159 }
1160
1161 static int invalid_dso_handle(void *h)
1162 {
1163         struct dso *p;
1164         for (p=head; p; p=p->next) if (h==p) return 0;
1165         snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
1166         errflag = 1;
1167         return 1;
1168 }
1169
1170 static void *do_dlsym(struct dso *p, const char *s, void *ra)
1171 {
1172         size_t i;
1173         uint32_t h = 0, gh = 0;
1174         Sym *sym;
1175         if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) {
1176                 if (p == RTLD_DEFAULT) {
1177                         p = head;
1178                 } else if (p == RTLD_NEXT) {
1179                         for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
1180                         if (!p) p=head;
1181                         p = p->next;
1182                 }
1183                 struct symdef def = find_sym(p, s, 0);
1184                 if (!def.sym) goto failed;
1185                 if ((def.sym->st_info&0xf) == STT_TLS)
1186                         return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value});
1187                 return def.dso->base + def.sym->st_value;
1188         }
1189         if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p))
1190                 return 0;
1191         if (p->ghashtab) {
1192                 gh = gnu_hash(s);
1193                 sym = gnu_lookup(s, gh, p);
1194         } else {
1195                 h = sysv_hash(s);
1196                 sym = sysv_lookup(s, h, p);
1197         }
1198         if (sym && (sym->st_info&0xf) == STT_TLS)
1199                 return __tls_get_addr((size_t []){p->tls_id, sym->st_value});
1200         if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
1201                 return p->base + sym->st_value;
1202         if (p->deps) for (i=0; p->deps[i]; i++) {
1203                 if (p->deps[i]->ghashtab) {
1204                         if (!gh) gh = gnu_hash(s);
1205                         sym = gnu_lookup(s, gh, p->deps[i]);
1206                 } else {
1207                         if (!h) h = sysv_hash(s);
1208                         sym = sysv_lookup(s, h, p->deps[i]);
1209                 }
1210                 if (sym && (sym->st_info&0xf) == STT_TLS)
1211                         return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value});
1212                 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
1213                         return p->deps[i]->base + sym->st_value;
1214         }
1215 failed:
1216         errflag = 1;
1217         snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s);
1218         return 0;
1219 }
1220
1221 int __dladdr(void *addr, Dl_info *info)
1222 {
1223         struct dso *p;
1224         Sym *sym;
1225         uint32_t nsym;
1226         char *strings;
1227         size_t i;
1228         void *best = 0;
1229         char *bestname;
1230
1231         pthread_rwlock_rdlock(&lock);
1232         for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next);
1233         pthread_rwlock_unlock(&lock);
1234
1235         if (!p) return 0;
1236
1237         sym = p->syms;
1238         strings = p->strings;
1239         if (p->hashtab) {
1240                 nsym = p->hashtab[1];
1241         } else {
1242                 uint32_t *buckets;
1243                 uint32_t *hashval;
1244                 buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
1245                 sym += p->ghashtab[1];
1246                 for (i = 0; i < p->ghashtab[0]; i++) {
1247                         if (buckets[i] > nsym)
1248                                 nsym = buckets[i];
1249                 }
1250                 if (nsym) {
1251                         nsym -= p->ghashtab[1];
1252                         hashval = buckets + p->ghashtab[0] + nsym;
1253                         do nsym++;
1254                         while (!(*hashval++ & 1));
1255                 }
1256         }
1257
1258         for (; nsym; nsym--, sym++) {
1259                 if (sym->st_value
1260                  && (1<<(sym->st_info&0xf) & OK_TYPES)
1261                  && (1<<(sym->st_info>>4) & OK_BINDS)) {
1262                         void *symaddr = p->base + sym->st_value;
1263                         if (symaddr > addr || symaddr < best)
1264                                 continue;
1265                         best = symaddr;
1266                         bestname = strings + sym->st_name;
1267                         if (addr == symaddr)
1268                                 break;
1269                 }
1270         }
1271
1272         if (!best) return 0;
1273
1274         info->dli_fname = p->name;
1275         info->dli_fbase = p->base;
1276         info->dli_sname = bestname;
1277         info->dli_saddr = best;
1278
1279         return 1;
1280 }
1281
1282 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
1283 {
1284         void *res;
1285         pthread_rwlock_rdlock(&lock);
1286         res = do_dlsym(p, s, ra);
1287         pthread_rwlock_unlock(&lock);
1288         return res;
1289 }
1290
1291 int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
1292 {
1293         struct dso *current;
1294         struct dl_phdr_info info;
1295         int ret = 0;
1296         for(current = head; current;) {
1297                 info.dlpi_addr      = (uintptr_t)current->base;
1298                 info.dlpi_name      = current->name;
1299                 info.dlpi_phdr      = current->phdr;
1300                 info.dlpi_phnum     = current->phnum;
1301                 info.dlpi_adds      = gencnt;
1302                 info.dlpi_subs      = 0;
1303                 info.dlpi_tls_modid = current->tls_id;
1304                 info.dlpi_tls_data  = current->tls_image;
1305
1306                 ret = (callback)(&info, sizeof (info), data);
1307
1308                 if (ret != 0) break;
1309
1310                 pthread_rwlock_rdlock(&lock);
1311                 current = current->next;
1312                 pthread_rwlock_unlock(&lock);
1313         }
1314         return ret;
1315 }
1316 #else
1317 static int invalid_dso_handle(void *h)
1318 {
1319         snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
1320         errflag = 1;
1321         return 1;
1322 }
1323 void *dlopen(const char *file, int mode)
1324 {
1325         return 0;
1326 }
1327 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
1328 {
1329         return 0;
1330 }
1331 int __dladdr (void *addr, Dl_info *info)
1332 {
1333         return 0;
1334 }
1335 #endif
1336
1337 int __dlinfo(void *dso, int req, void *res)
1338 {
1339         if (invalid_dso_handle(dso)) return -1;
1340         if (req != RTLD_DI_LINKMAP) {
1341                 snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req);
1342                 errflag = 1;
1343                 return -1;
1344         }
1345         *(struct link_map **)res = dso;
1346         return 0;
1347 }
1348
1349 char *dlerror()
1350 {
1351         if (!errflag) return 0;
1352         errflag = 0;
1353         return errbuf;
1354 }
1355
1356 int dlclose(void *p)
1357 {
1358         return invalid_dso_handle(p);
1359 }