22 static char errbuf[128];
26 #if ULONG_MAX == 0xffffffff
27 typedef Elf32_Ehdr Ehdr;
28 typedef Elf32_Phdr Phdr;
29 typedef Elf32_Sym Sym;
30 #define R_TYPE(x) ((x)&255)
31 #define R_SYM(x) ((x)>>8)
33 typedef Elf64_Ehdr Ehdr;
34 typedef Elf64_Phdr Phdr;
35 typedef Elf64_Sym Sym;
36 #define R_TYPE(x) ((x)&0xffffffff)
37 #define R_SYM(x) ((x)>>32)
52 struct dso *next, *prev;
73 void __init_ssp(size_t *);
75 static struct dso *head, *tail, *libc;
76 static char *env_path, *sys_path, *r_path;
82 static jmp_buf rtld_fail;
83 static pthread_rwlock_t lock;
84 static struct debug debug;
87 struct debug *_dl_debug_addr = &debug;
92 static void decode_vec(size_t *v, size_t *a, size_t cnt)
94 memset(a, 0, cnt*sizeof(size_t));
95 for (; v[0]; v+=2) if (v[0]<cnt) {
101 static int search_vec(size_t *v, size_t *r, size_t key)
103 for (; v[0]!=key; v+=2)
109 static uint32_t sysv_hash(const char *s0)
111 const unsigned char *s = (void *)s0;
117 return h & 0xfffffff;
120 static uint32_t gnu_hash(const char *s0)
122 const unsigned char *s = (void *)s0;
123 uint_fast32_t h = 5381;
129 static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
132 Sym *syms = dso->syms;
133 uint32_t *hashtab = dso->hashtab;
134 char *strings = dso->strings;
135 for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
136 if (!strcmp(s, strings+syms[i].st_name))
142 static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
146 uint32_t *hashtab = dso->ghashtab;
147 uint32_t nbuckets = hashtab[0];
148 uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
151 uint32_t n = buckets[h1 % nbuckets];
155 strings = dso->strings;
157 hashval = buckets + nbuckets + (n - hashtab[1]);
159 for (h1 |= 1; ; sym++) {
161 if ((h1 == (h2|1)) && !strcmp(s, strings + sym->st_name))
169 #define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON)
170 #define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK)
172 static void *find_sym(struct dso *dso, const char *s, int need_def)
174 uint32_t h = 0, gh = 0;
178 if (gh == 0xf9040207 && !strcmp(s, "dlopen")) rtld_used = 1;
179 if (gh == 0xf4dc4ae && !strcmp(s, "dlsym")) rtld_used = 1;
180 if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
183 if (h == 0x6b366be && !strcmp(s, "dlopen")) rtld_used = 1;
184 if (h == 0x6b3afd && !strcmp(s, "dlsym")) rtld_used = 1;
185 if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
187 for (; dso; dso=dso->next) {
189 if (!dso->global) continue;
191 if (!gh) gh = gnu_hash(s);
192 sym = gnu_lookup(s, gh, dso);
194 if (!h) h = sysv_hash(s);
195 sym = sysv_lookup(s, h, dso);
197 if (sym && (!need_def || sym->st_shndx) && sym->st_value
198 && (1<<(sym->st_info&0xf) & OK_TYPES)
199 && (1<<(sym->st_info>>4) & OK_BINDS)) {
200 if (def && sym->st_info>>4 == STB_WEAK) continue;
201 def = dso->base + sym->st_value;
202 if (sym->st_info>>4 == STB_GLOBAL) break;
208 static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
210 unsigned char *base = dso->base;
211 Sym *syms = dso->syms;
212 char *strings = dso->strings;
215 size_t sym_val, sym_size;
221 for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
222 reloc_addr = (void *)(base + rel[0]);
223 type = R_TYPE(rel[1]);
224 sym_index = R_SYM(rel[1]);
226 sym = syms + sym_index;
227 name = strings + sym->st_name;
228 ctx = IS_COPY(type) ? head->next : head;
229 sym_val = (size_t)find_sym(ctx, name, IS_PLT(type));
230 if (!sym_val && sym->st_info>>4 != STB_WEAK) {
231 snprintf(errbuf, sizeof errbuf,
232 "Error relocating %s: %s: symbol not found",
234 if (runtime) longjmp(rtld_fail, 1);
235 dprintf(2, "%s\n", errbuf);
239 sym_size = sym->st_size;
241 sym_val = sym_size = 0;
243 do_single_reloc(reloc_addr, type, sym_val, sym_size, base, rel[2]);
247 /* A huge hack: to make up for the wastefulness of shared libraries
248 * needing at least a page of dirty memory even if they have no global
249 * data, we reclaim the gaps at the beginning and end of writable maps
250 * and "donate" them to the heap by setting up minimal malloc
251 * structures and then freeing them. */
253 static void reclaim(unsigned char *base, size_t start, size_t end)
256 start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t);
257 end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t);
258 if (start>end || end-start < 4*sizeof(size_t)) return;
259 a = (size_t *)(base + start);
260 z = (size_t *)(base + end);
262 a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1;
267 static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt)
269 for (; phcnt--; ph=(void *)((char *)ph+phent)) {
270 if (ph->p_type!=PT_LOAD) continue;
271 if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
272 reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
273 reclaim(base, ph->p_vaddr+ph->p_memsz,
274 ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
278 static void *map_library(int fd, size_t *lenp, unsigned char **basep, size_t *dynp)
280 Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
282 size_t addr_min=SIZE_MAX, addr_max=0, map_len;
283 size_t this_min, this_max;
288 unsigned char *map, *base;
292 ssize_t l = read(fd, buf, sizeof buf);
293 if (l<sizeof *eh) return 0;
295 phsize = eh->e_phentsize * eh->e_phnum;
296 if (phsize + sizeof *eh > l) return 0;
297 if (eh->e_phoff + phsize > l) {
298 l = pread(fd, buf+1, phsize, eh->e_phoff);
299 if (l != phsize) return 0;
300 eh->e_phoff = sizeof *eh;
302 ph = (void *)((char *)buf + eh->e_phoff);
303 for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
304 if (ph->p_type == PT_DYNAMIC)
306 if (ph->p_type != PT_LOAD) continue;
307 if (ph->p_vaddr < addr_min) {
308 addr_min = ph->p_vaddr;
309 off_start = ph->p_offset;
310 prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
311 ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
312 ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
314 if (ph->p_vaddr+ph->p_memsz > addr_max) {
315 addr_max = ph->p_vaddr+ph->p_memsz;
319 addr_max += PAGE_SIZE-1;
320 addr_max &= -PAGE_SIZE;
321 addr_min &= -PAGE_SIZE;
322 off_start &= -PAGE_SIZE;
323 map_len = addr_max - addr_min + off_start;
324 /* The first time, we map too much, possibly even more than
325 * the length of the file. This is okay because we will not
326 * use the invalid part; we just need to reserve the right
327 * amount of virtual address space to map over later. */
328 map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
329 if (map==MAP_FAILED) return 0;
330 base = map - addr_min;
331 ph = (void *)((char *)buf + eh->e_phoff);
332 for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
333 if (ph->p_type != PT_LOAD) continue;
334 /* Reuse the existing mapping for the lowest-address LOAD */
335 if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
336 this_min = ph->p_vaddr & -PAGE_SIZE;
337 this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE;
338 off_start = ph->p_offset & -PAGE_SIZE;
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 if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
344 if (ph->p_memsz > ph->p_filesz) {
345 size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
346 size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE;
347 memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1);
348 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)
352 for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
353 if (((size_t *)(base+dyn))[i]==DT_TEXTREL) {
354 if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0)
358 if (!runtime) reclaim_gaps(base, (void *)((char *)buf + eh->e_phoff),
359 eh->e_phentsize, eh->e_phnum);
365 munmap(map, map_len);
369 static int path_open(const char *name, const char *search, char *buf, size_t buf_size)
371 const char *s=search, *z;
377 l = z ? z-s : strlen(s);
378 snprintf(buf, buf_size, "%.*s/%s", l, s, name);
379 if ((fd = open(buf, O_RDONLY))>=0) return fd;
384 static void decode_dyn(struct dso *p)
386 size_t dyn[DYN_CNT] = {0};
387 decode_vec(p->dynv, dyn, DYN_CNT);
388 p->syms = (void *)(p->base + dyn[DT_SYMTAB]);
389 p->strings = (void *)(p->base + dyn[DT_STRTAB]);
390 if (dyn[0]&(1<<DT_HASH))
391 p->hashtab = (void *)(p->base + dyn[DT_HASH]);
392 if (search_vec(p->dynv, dyn, DT_GNU_HASH))
393 p->ghashtab = (void *)(p->base + *dyn);
396 static struct dso *load_library(const char *name)
398 char buf[2*NAME_MAX+2];
399 const char *pathname;
400 unsigned char *base, *map;
401 size_t dyno, map_len;
406 /* Catch and block attempts to reload the implementation itself */
407 if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
408 static const char *rp, reserved[] =
409 "c\0pthread\0rt\0m\0dl\0util\0xnet\0";
410 char *z = strchr(name, '.');
413 for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1);
418 tail = libc->next ? libc->next : libc;
424 if (strchr(name, '/')) {
426 fd = open(name, O_RDONLY);
428 /* Search for the name to see if it's already loaded */
429 for (p=head->next; p; p=p->next) {
430 if (p->shortname && !strcmp(p->shortname, name)) {
435 if (strlen(name) > NAME_MAX) return 0;
437 if (r_path) fd = path_open(name, r_path, buf, sizeof buf);
438 if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf);
441 FILE *f = fopen(ETC_LDSO_PATH, "r");
443 if (getline(&sys_path, (size_t[1]){0}, f) > 0)
444 sys_path[strlen(sys_path)-1]=0;
448 if (sys_path) fd = path_open(name, sys_path, buf, sizeof buf);
449 else fd = path_open(name, "/lib:/usr/local/lib:/usr/lib", buf, sizeof buf);
453 if (fd < 0) return 0;
454 if (fstat(fd, &st) < 0) {
458 for (p=head->next; p; p=p->next) {
459 if (p->dev == st.st_dev && p->ino == st.st_ino) {
460 /* If this library was previously loaded with a
461 * pathname but a search found the same inode,
462 * setup its shortname so it can be found by name. */
463 if (!p->shortname) p->shortname = strrchr(p->name, '/')+1;
469 map = map_library(fd, &map_len, &base, &dyno);
472 p = calloc(1, sizeof *p + strlen(pathname) + 1);
474 munmap(map, map_len);
479 p->map_len = map_len;
481 p->dynv = (void *)(base + dyno);
488 strcpy(p->name, pathname);
489 /* Add a shortname only if name arg was not an explicit pathname. */
490 if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
496 if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, base);
501 static void load_deps(struct dso *p)
504 struct dso ***deps = &p->deps, **tmp, *dep;
505 for (; p; p=p->next) {
506 for (i=0; p->dynv[i]; i+=2) {
507 if (p->dynv[i] != DT_RPATH) continue;
508 r_path = (void *)(p->strings + p->dynv[i+1]);
510 for (i=0; p->dynv[i]; i+=2) {
511 if (p->dynv[i] != DT_NEEDED) continue;
512 dep = load_library(p->strings + p->dynv[i+1]);
514 snprintf(errbuf, sizeof errbuf,
515 "Error loading shared library %s: %m (needed by %s)",
516 p->strings + p->dynv[i+1], p->name);
517 if (runtime) longjmp(rtld_fail, 1);
518 dprintf(2, "%s\n", errbuf);
523 tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2));
524 if (!tmp) longjmp(rtld_fail, 1);
534 static void load_preload(char *s)
539 for ( ; *s && isspace(*s); s++);
540 for (z=s; *z && !isspace(*z); z++);
548 static void make_global(struct dso *p)
550 for (; p; p=p->next) p->global = 1;
553 static void reloc_all(struct dso *p)
555 size_t dyn[DYN_CNT] = {0};
556 for (; p; p=p->next) {
557 if (p->relocated) continue;
558 decode_vec(p->dynv, dyn, DYN_CNT);
559 #ifdef NEED_ARCH_RELOCS
560 do_arch_relocs(p, head);
562 do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
563 2+(dyn[DT_PLTREL]==DT_RELA));
564 do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
565 do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
570 static void free_all(struct dso *p)
575 if (p->map && p!=libc && p!=head) free(p);
580 static size_t find_dyn(Phdr *ph, size_t cnt, size_t stride)
582 for (; cnt--; ph = (void *)((char *)ph + stride))
583 if (ph->p_type == PT_DYNAMIC)
588 static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p)
590 size_t min_addr = -1, max_addr = 0;
591 for (; cnt--; ph = (void *)((char *)ph + stride)) {
592 if (ph->p_type != PT_LOAD) continue;
593 if (ph->p_vaddr < min_addr)
594 min_addr = ph->p_vaddr;
595 if (ph->p_vaddr+ph->p_memsz > max_addr)
596 max_addr = ph->p_vaddr+ph->p_memsz;
598 min_addr &= -PAGE_SIZE;
599 max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE;
600 p->map = p->base + min_addr;
601 p->map_len = max_addr - min_addr;
604 static void do_init_fini(struct dso *p)
606 size_t dyn[DYN_CNT] = {0};
607 for (; p; p=p->prev) {
608 if (p->constructed) return;
609 decode_vec(p->dynv, dyn, DYN_CNT);
610 if (dyn[0] & (1<<DT_FINI))
611 atexit((void (*)(void))(p->base + dyn[DT_FINI]));
612 if (dyn[0] & (1<<DT_INIT))
613 ((void (*)(void))(p->base + dyn[DT_INIT]))();
618 void _dl_debug_state(void)
622 void *__dynlink(int argc, char **argv)
624 size_t aux[AUX_CNT] = {0};
628 static struct dso builtin_dsos[3];
629 struct dso *const app = builtin_dsos+0;
630 struct dso *const lib = builtin_dsos+1;
631 struct dso *const vdso = builtin_dsos+2;
635 /* Find aux vector just past environ[] */
636 for (i=argc+1; argv[i]; i++)
637 if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
638 env_path = argv[i]+16;
639 else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
640 env_preload = argv[i]+11;
641 auxv = (void *)(argv+i+1);
643 decode_vec(auxv, aux, AUX_CNT);
645 /* Only trust user/env if kernel says we're not suid/sgid */
646 if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
647 || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
652 /* If the dynamic linker was invoked as a program itself, AT_BASE
653 * will not be set. In that case, we assume the base address is
654 * the start of the page containing the PHDRs; I don't know any
655 * better approach... */
657 aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE;
658 aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0;
661 /* The dynamic linker load address is passed by the kernel
662 * in the AUX vector, so this is easy. */
663 lib->base = (void *)aux[AT_BASE];
664 lib->name = lib->shortname = "libc.so";
666 ehdr = (void *)lib->base;
667 find_map_range((void *)(aux[AT_BASE]+ehdr->e_phoff),
668 ehdr->e_phnum, ehdr->e_phentsize, lib);
669 lib->dynv = (void *)(lib->base + find_dyn(
670 (void *)(aux[AT_BASE]+ehdr->e_phoff),
671 ehdr->e_phnum, ehdr->e_phentsize));
675 size_t interp_off = 0;
676 /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
677 phdr = (void *)aux[AT_PHDR];
678 for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
679 if (phdr->p_type == PT_PHDR)
680 app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
681 else if (phdr->p_type == PT_INTERP)
682 interp_off = (size_t)phdr->p_vaddr;
684 if (interp_off) lib->name = (char *)app->base + interp_off;
686 app->dynv = (void *)(app->base + find_dyn(
687 (void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
688 find_map_range((void *)aux[AT_PHDR],
689 aux[AT_PHNUM], aux[AT_PHENT], app);
692 char *ldname = argv[0];
693 size_t dyno, l = strlen(ldname);
694 if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
695 *argv++ = (void *)-1;
696 if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1;
698 dprintf(2, "musl libc/dynamic program loader\n");
699 dprintf(2, "usage: %s pathname%s\n", ldname,
700 ldd_mode ? "" : " [args]");
703 fd = open(argv[0], O_RDONLY);
705 dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno));
709 ehdr = (void *)map_library(fd, &app->map_len, &app->base, &dyno);
711 dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
718 app->dynv = (void *)(app->base + dyno);
719 aux[AT_ENTRY] = ehdr->e_entry;
722 app->constructed = 1;
725 /* Attach to vdso, if provided by the kernel */
726 if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
727 ehdr = (void *)vdso_base;
728 phdr = (void *)(vdso_base + ehdr->e_phoff);
729 for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
730 if (phdr->p_type == PT_DYNAMIC)
731 vdso->dynv = (void *)(vdso_base + phdr->p_offset);
732 if (phdr->p_type == PT_LOAD)
733 vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
735 vdso->name = vdso->shortname = "linux-gate.so.1";
742 /* Initial dso chain consists only of the app. We temporarily
743 * append the dynamic linker/libc so we can relocate it, then
744 * restore the initial chain in preparation for loading third
745 * party libraries (preload/needed). */
752 /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
754 /* Donate unused parts of app and library mapping to malloc */
755 reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]);
756 ehdr = (void *)lib->base;
757 reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff),
758 ehdr->e_phentsize, ehdr->e_phnum);
760 /* Load preload/needed libraries, add their symbols to the global
761 * namespace, and perform all remaining relocations. The main
762 * program must be relocated LAST since it may contain copy
763 * relocations which depend on libraries' relocations. */
764 if (env_preload) load_preload(env_preload);
767 reloc_all(app->next);
770 if (ldso_fail) _exit(127);
771 if (ldd_mode) _exit(0);
773 /* Switch to runtime mode: any further failures in the dynamic
774 * linker are a reportable failure rather than a fatal startup
775 * error. If the dynamic loader (dlopen) will not be used, free
776 * all memory used by the dynamic linker. */
779 #ifndef DYNAMIC_IS_RO
780 for (i=0; app->dynv[i]; i+=2)
781 if (app->dynv[i]==DT_DEBUG)
782 app->dynv[i+1] = (size_t)&debug;
785 debug.bp = _dl_debug_state;
787 debug.base = lib->base;
791 if (ssp_used) __init_ssp(auxv);
798 reclaim((void *)builtin_dsos, 0, sizeof builtin_dsos);
802 return (void *)aux[AT_ENTRY];
805 void *dlopen(const char *file, int mode)
807 struct dso *volatile p, *orig_tail = tail, *next;
811 if (!file) return head;
813 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
814 pthread_rwlock_wrlock(&lock);
816 if (setjmp(rtld_fail)) {
817 /* Clean up anything new that was (partially) loaded */
818 if (p->deps) for (i=0; p->deps[i]; i++)
819 if (p->deps[i]->global < 0)
820 p->deps[i]->global = 0;
821 for (p=orig_tail->next; p; p=next) {
823 munmap(p->map, p->map_len);
832 } else p = load_library(file);
835 snprintf(errbuf, sizeof errbuf,
836 "Error loading shared library %s: %m", file);
841 /* First load handling */
844 if (p->deps) for (i=0; p->deps[i]; i++)
845 if (!p->deps[i]->global)
846 p->deps[i]->global = -1;
847 if (!p->global) p->global = -1;
849 if (p->deps) for (i=0; p->deps[i]; i++)
850 if (p->deps[i]->global < 0)
851 p->deps[i]->global = 0;
852 if (p->global < 0) p->global = 0;
855 if (mode & RTLD_GLOBAL) {
856 if (p->deps) for (i=0; p->deps[i]; i++)
857 p->deps[i]->global = 1;
861 if (ssp_used) __init_ssp(auxv);
867 pthread_rwlock_unlock(&lock);
868 pthread_setcancelstate(cs, 0);
872 static void *do_dlsym(struct dso *p, const char *s, void *ra)
875 uint32_t h = 0, gh = 0;
877 if (p == RTLD_NEXT) {
878 for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
880 void *res = find_sym(p->next, s, 0);
881 if (!res) goto failed;
884 if (p == head || p == RTLD_DEFAULT) {
885 void *res = find_sym(head, s, 0);
886 if (!res) goto failed;
891 sym = gnu_lookup(s, gh, p);
894 sym = sysv_lookup(s, h, p);
896 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
897 return p->base + sym->st_value;
898 if (p->deps) for (i=0; p->deps[i]; i++) {
899 if (p->deps[i]->ghashtab) {
900 if (!gh) gh = gnu_hash(s);
901 sym = gnu_lookup(s, gh, p->deps[i]);
903 if (!h) h = sysv_hash(s);
904 sym = sysv_lookup(s, h, p->deps[i]);
906 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
907 return p->deps[i]->base + sym->st_value;
911 snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s);
915 int __dladdr(void *addr, Dl_info *info)
925 pthread_rwlock_rdlock(&lock);
926 for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next);
927 pthread_rwlock_unlock(&lock);
932 strings = p->strings;
934 nsym = p->hashtab[1];
938 buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
939 sym += p->ghashtab[1];
940 for (i = 0; i < p->ghashtab[0]; i++) {
941 if (buckets[i] > nsym)
945 nsym -= p->ghashtab[1];
946 hashval = buckets + p->ghashtab[0] + nsym;
948 while (!(*hashval++ & 1));
952 for (; nsym; nsym--, sym++) {
953 if (sym->st_shndx && sym->st_value
954 && (1<<(sym->st_info&0xf) & OK_TYPES)
955 && (1<<(sym->st_info>>4) & OK_BINDS)) {
956 void *symaddr = p->base + sym->st_value;
957 if (symaddr > addr || symaddr < best)
960 bestname = strings + sym->st_name;
968 info->dli_fname = p->name;
969 info->dli_fbase = p->base;
970 info->dli_sname = bestname;
971 info->dli_saddr = best;
976 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
979 pthread_rwlock_rdlock(&lock);
980 res = do_dlsym(p, s, ra);
981 pthread_rwlock_unlock(&lock);
985 void *dlopen(const char *file, int mode)
989 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
993 int __dladdr (void *addr, Dl_info *info)
1001 if (!errflag) return 0;
1006 int dlclose(void *p)