20 #include "pthread_impl.h"
25 static char errbuf[128];
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)
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)
55 struct dso *next, *prev;
76 void __init_ssp(size_t *);
78 static struct dso *head, *tail, *libc;
79 static char *env_path, *sys_path, *r_path;
85 static jmp_buf rtld_fail;
86 static pthread_rwlock_t lock;
87 static struct debug debug;
90 struct debug *_dl_debug_addr = &debug;
95 static void decode_vec(size_t *v, size_t *a, size_t cnt)
97 memset(a, 0, cnt*sizeof(size_t));
98 for (; v[0]; v+=2) if (v[0]<cnt) {
104 static int search_vec(size_t *v, size_t *r, size_t key)
106 for (; v[0]!=key; v+=2)
112 static uint32_t sysv_hash(const char *s0)
114 const unsigned char *s = (void *)s0;
120 return h & 0xfffffff;
123 static uint32_t gnu_hash(const char *s0)
125 const unsigned char *s = (void *)s0;
126 uint_fast32_t h = 5381;
132 static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
135 Sym *syms = dso->syms;
136 uint32_t *hashtab = dso->hashtab;
137 char *strings = dso->strings;
138 for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
139 if (!strcmp(s, strings+syms[i].st_name))
145 static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
149 uint32_t *hashtab = dso->ghashtab;
150 uint32_t nbuckets = hashtab[0];
151 uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
154 uint32_t n = buckets[h1 % nbuckets];
158 strings = dso->strings;
160 hashval = buckets + nbuckets + (n - hashtab[1]);
162 for (h1 |= 1; ; sym++) {
164 if ((h1 == (h2|1)) && !strcmp(s, strings + sym->st_name))
172 #define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON)
173 #define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK)
175 static void *find_sym(struct dso *dso, const char *s, int need_def)
177 uint32_t h = 0, gh = 0;
181 if (gh == 0xf9040207 && !strcmp(s, "dlopen")) rtld_used = 1;
182 if (gh == 0xf4dc4ae && !strcmp(s, "dlsym")) rtld_used = 1;
183 if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
186 if (h == 0x6b366be && !strcmp(s, "dlopen")) rtld_used = 1;
187 if (h == 0x6b3afd && !strcmp(s, "dlsym")) rtld_used = 1;
188 if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
190 for (; dso; dso=dso->next) {
192 if (!dso->global) continue;
194 if (!gh) gh = gnu_hash(s);
195 sym = gnu_lookup(s, gh, dso);
197 if (!h) h = sysv_hash(s);
198 sym = sysv_lookup(s, h, dso);
200 if (sym && (!need_def || sym->st_shndx) && sym->st_value
201 && (1<<(sym->st_info&0xf) & OK_TYPES)
202 && (1<<(sym->st_info>>4) & OK_BINDS)) {
203 if (def && sym->st_info>>4 == STB_WEAK) continue;
204 def = dso->base + sym->st_value;
205 if (sym->st_info>>4 == STB_GLOBAL) break;
211 static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
213 unsigned char *base = dso->base;
214 Sym *syms = dso->syms;
215 char *strings = dso->strings;
218 size_t sym_val, sym_size;
224 for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
225 reloc_addr = (void *)(base + rel[0]);
226 type = R_TYPE(rel[1]);
227 sym_index = R_SYM(rel[1]);
229 sym = syms + sym_index;
230 name = strings + sym->st_name;
231 ctx = IS_COPY(type) ? head->next : head;
232 sym_val = (size_t)find_sym(ctx, name, IS_PLT(type));
233 if (!sym_val && sym->st_info>>4 != STB_WEAK) {
234 snprintf(errbuf, sizeof errbuf,
235 "Error relocating %s: %s: symbol not found",
237 if (runtime) longjmp(rtld_fail, 1);
238 dprintf(2, "%s\n", errbuf);
242 sym_size = sym->st_size;
244 sym_val = sym_size = 0;
246 do_single_reloc(reloc_addr, type, sym_val, sym_size, base, rel[2]);
250 /* A huge hack: to make up for the wastefulness of shared libraries
251 * needing at least a page of dirty memory even if they have no global
252 * data, we reclaim the gaps at the beginning and end of writable maps
253 * and "donate" them to the heap by setting up minimal malloc
254 * structures and then freeing them. */
256 static void reclaim(unsigned char *base, size_t start, size_t end)
259 start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t);
260 end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t);
261 if (start>end || end-start < 4*sizeof(size_t)) return;
262 a = (size_t *)(base + start);
263 z = (size_t *)(base + end);
265 a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1;
270 static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt)
272 for (; phcnt--; ph=(void *)((char *)ph+phent)) {
273 if (ph->p_type!=PT_LOAD) continue;
274 if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
275 reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
276 reclaim(base, ph->p_vaddr+ph->p_memsz,
277 ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
281 static void *map_library(int fd, size_t *lenp, unsigned char **basep, size_t *dynp)
283 Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
285 size_t addr_min=SIZE_MAX, addr_max=0, map_len;
286 size_t this_min, this_max;
291 unsigned char *map, *base;
295 ssize_t l = read(fd, buf, sizeof buf);
296 if (l<sizeof *eh) return 0;
298 phsize = eh->e_phentsize * eh->e_phnum;
299 if (phsize + sizeof *eh > l) return 0;
300 if (eh->e_phoff + phsize > l) {
301 l = pread(fd, buf+1, phsize, eh->e_phoff);
302 if (l != phsize) return 0;
303 eh->e_phoff = sizeof *eh;
305 ph = (void *)((char *)buf + eh->e_phoff);
306 for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
307 if (ph->p_type == PT_DYNAMIC)
309 if (ph->p_type != PT_LOAD) continue;
310 if (ph->p_vaddr < addr_min) {
311 addr_min = ph->p_vaddr;
312 off_start = ph->p_offset;
313 prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
314 ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
315 ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
317 if (ph->p_vaddr+ph->p_memsz > addr_max) {
318 addr_max = ph->p_vaddr+ph->p_memsz;
322 addr_max += PAGE_SIZE-1;
323 addr_max &= -PAGE_SIZE;
324 addr_min &= -PAGE_SIZE;
325 off_start &= -PAGE_SIZE;
326 map_len = addr_max - addr_min + off_start;
327 /* The first time, we map too much, possibly even more than
328 * the length of the file. This is okay because we will not
329 * use the invalid part; we just need to reserve the right
330 * amount of virtual address space to map over later. */
331 map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
332 if (map==MAP_FAILED) return 0;
333 base = map - addr_min;
334 ph = (void *)((char *)buf + eh->e_phoff);
335 for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
336 if (ph->p_type != PT_LOAD) continue;
337 /* Reuse the existing mapping for the lowest-address LOAD */
338 if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
339 this_min = ph->p_vaddr & -PAGE_SIZE;
340 this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE;
341 off_start = ph->p_offset & -PAGE_SIZE;
342 prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
343 ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
344 ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
345 if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
347 if (ph->p_memsz > ph->p_filesz) {
348 size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
349 size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE;
350 memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1);
351 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)
355 for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
356 if (((size_t *)(base+dyn))[i]==DT_TEXTREL) {
357 if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0)
361 if (!runtime) reclaim_gaps(base, (void *)((char *)buf + eh->e_phoff),
362 eh->e_phentsize, eh->e_phnum);
368 munmap(map, map_len);
372 static int path_open(const char *name, const char *search, char *buf, size_t buf_size)
374 const char *s=search, *z;
380 l = z ? z-s : strlen(s);
381 snprintf(buf, buf_size, "%.*s/%s", l, s, name);
382 if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd;
387 static void decode_dyn(struct dso *p)
389 size_t dyn[DYN_CNT] = {0};
390 decode_vec(p->dynv, dyn, DYN_CNT);
391 p->syms = (void *)(p->base + dyn[DT_SYMTAB]);
392 p->strings = (void *)(p->base + dyn[DT_STRTAB]);
393 if (dyn[0]&(1<<DT_HASH))
394 p->hashtab = (void *)(p->base + dyn[DT_HASH]);
395 if (search_vec(p->dynv, dyn, DT_GNU_HASH))
396 p->ghashtab = (void *)(p->base + *dyn);
399 static struct dso *load_library(const char *name)
401 char buf[2*NAME_MAX+2];
402 const char *pathname;
403 unsigned char *base, *map;
404 size_t dyno, map_len;
409 /* Catch and block attempts to reload the implementation itself */
410 if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
411 static const char *rp, reserved[] =
412 "c\0pthread\0rt\0m\0dl\0util\0xnet\0";
413 char *z = strchr(name, '.');
416 for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1);
421 tail = libc->next ? libc->next : libc;
427 if (strchr(name, '/')) {
429 fd = open(name, O_RDONLY|O_CLOEXEC);
431 /* Search for the name to see if it's already loaded */
432 for (p=head->next; p; p=p->next) {
433 if (p->shortname && !strcmp(p->shortname, name)) {
438 if (strlen(name) > NAME_MAX) return 0;
440 if (r_path) fd = path_open(name, r_path, buf, sizeof buf);
441 if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf);
444 FILE *f = fopen(ETC_LDSO_PATH, "rbe");
446 if (getline(&sys_path, (size_t[1]){0}, f) > 0)
447 sys_path[strlen(sys_path)-1]=0;
451 if (sys_path) fd = path_open(name, sys_path, buf, sizeof buf);
452 else fd = path_open(name, "/lib:/usr/local/lib:/usr/lib", buf, sizeof buf);
456 if (fd < 0) return 0;
457 if (fstat(fd, &st) < 0) {
461 for (p=head->next; p; p=p->next) {
462 if (p->dev == st.st_dev && p->ino == st.st_ino) {
463 /* If this library was previously loaded with a
464 * pathname but a search found the same inode,
465 * setup its shortname so it can be found by name. */
466 if (!p->shortname) p->shortname = strrchr(p->name, '/')+1;
472 map = map_library(fd, &map_len, &base, &dyno);
475 p = calloc(1, sizeof *p + strlen(pathname) + 1);
477 munmap(map, map_len);
482 p->map_len = map_len;
484 p->dynv = (void *)(base + dyno);
491 strcpy(p->name, pathname);
492 /* Add a shortname only if name arg was not an explicit pathname. */
493 if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
499 if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, base);
504 static void load_deps(struct dso *p)
507 struct dso ***deps = &p->deps, **tmp, *dep;
508 for (; p; p=p->next) {
509 for (i=0; p->dynv[i]; i+=2) {
510 if (p->dynv[i] != DT_RPATH) continue;
511 r_path = (void *)(p->strings + p->dynv[i+1]);
513 for (i=0; p->dynv[i]; i+=2) {
514 if (p->dynv[i] != DT_NEEDED) continue;
515 dep = load_library(p->strings + p->dynv[i+1]);
517 snprintf(errbuf, sizeof errbuf,
518 "Error loading shared library %s: %m (needed by %s)",
519 p->strings + p->dynv[i+1], p->name);
520 if (runtime) longjmp(rtld_fail, 1);
521 dprintf(2, "%s\n", errbuf);
526 tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2));
527 if (!tmp) longjmp(rtld_fail, 1);
537 static void load_preload(char *s)
542 for ( ; *s && isspace(*s); s++);
543 for (z=s; *z && !isspace(*z); z++);
551 static void make_global(struct dso *p)
553 for (; p; p=p->next) p->global = 1;
556 static void reloc_all(struct dso *p)
558 size_t dyn[DYN_CNT] = {0};
559 for (; p; p=p->next) {
560 if (p->relocated) continue;
561 decode_vec(p->dynv, dyn, DYN_CNT);
562 #ifdef NEED_ARCH_RELOCS
563 do_arch_relocs(p, head);
565 do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
566 2+(dyn[DT_PLTREL]==DT_RELA));
567 do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
568 do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
573 static void free_all(struct dso *p)
578 if (p->map && p!=libc && p!=head) free(p);
583 static size_t find_dyn(Phdr *ph, size_t cnt, size_t stride)
585 for (; cnt--; ph = (void *)((char *)ph + stride))
586 if (ph->p_type == PT_DYNAMIC)
591 static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p)
593 size_t min_addr = -1, max_addr = 0;
594 for (; cnt--; ph = (void *)((char *)ph + stride)) {
595 if (ph->p_type != PT_LOAD) continue;
596 if (ph->p_vaddr < min_addr)
597 min_addr = ph->p_vaddr;
598 if (ph->p_vaddr+ph->p_memsz > max_addr)
599 max_addr = ph->p_vaddr+ph->p_memsz;
601 min_addr &= -PAGE_SIZE;
602 max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE;
603 p->map = p->base + min_addr;
604 p->map_len = max_addr - min_addr;
607 static void do_init_fini(struct dso *p)
609 size_t dyn[DYN_CNT] = {0};
610 for (; p; p=p->prev) {
611 if (p->constructed) return;
612 decode_vec(p->dynv, dyn, DYN_CNT);
613 if (dyn[0] & (1<<DT_FINI))
614 atexit((void (*)(void))(p->base + dyn[DT_FINI]));
615 if (dyn[0] & (1<<DT_INIT))
616 ((void (*)(void))(p->base + dyn[DT_INIT]))();
621 void _dl_debug_state(void)
625 void *__dynlink(int argc, char **argv)
627 size_t aux[AUX_CNT] = {0};
631 static struct dso builtin_dsos[3];
632 struct dso *const app = builtin_dsos+0;
633 struct dso *const lib = builtin_dsos+1;
634 struct dso *const vdso = builtin_dsos+2;
638 /* Find aux vector just past environ[] */
639 for (i=argc+1; argv[i]; i++)
640 if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
641 env_path = argv[i]+16;
642 else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
643 env_preload = argv[i]+11;
644 auxv = (void *)(argv+i+1);
646 decode_vec(auxv, aux, AUX_CNT);
648 /* Only trust user/env if kernel says we're not suid/sgid */
649 if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
650 || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
655 /* If the dynamic linker was invoked as a program itself, AT_BASE
656 * will not be set. In that case, we assume the base address is
657 * the start of the page containing the PHDRs; I don't know any
658 * better approach... */
660 aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE;
661 aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0;
664 /* The dynamic linker load address is passed by the kernel
665 * in the AUX vector, so this is easy. */
666 lib->base = (void *)aux[AT_BASE];
667 lib->name = lib->shortname = "libc.so";
669 ehdr = (void *)lib->base;
670 find_map_range((void *)(aux[AT_BASE]+ehdr->e_phoff),
671 ehdr->e_phnum, ehdr->e_phentsize, lib);
672 lib->dynv = (void *)(lib->base + find_dyn(
673 (void *)(aux[AT_BASE]+ehdr->e_phoff),
674 ehdr->e_phnum, ehdr->e_phentsize));
678 size_t interp_off = 0;
679 /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
680 phdr = (void *)aux[AT_PHDR];
681 for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
682 if (phdr->p_type == PT_PHDR)
683 app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
684 else if (phdr->p_type == PT_INTERP)
685 interp_off = (size_t)phdr->p_vaddr;
687 if (interp_off) lib->name = (char *)app->base + interp_off;
689 app->dynv = (void *)(app->base + find_dyn(
690 (void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
691 find_map_range((void *)aux[AT_PHDR],
692 aux[AT_PHNUM], aux[AT_PHENT], app);
695 char *ldname = argv[0];
696 size_t dyno, l = strlen(ldname);
697 if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
698 *argv++ = (void *)-1;
699 if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1;
701 dprintf(2, "musl libc/dynamic program loader\n");
702 dprintf(2, "usage: %s pathname%s\n", ldname,
703 ldd_mode ? "" : " [args]");
706 fd = open(argv[0], O_RDONLY);
708 dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno));
712 ehdr = (void *)map_library(fd, &app->map_len, &app->base, &dyno);
714 dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
721 app->dynv = (void *)(app->base + dyno);
722 aux[AT_ENTRY] = ehdr->e_entry;
725 app->constructed = 1;
728 /* Attach to vdso, if provided by the kernel */
729 if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
730 ehdr = (void *)vdso_base;
731 phdr = (void *)(vdso_base + ehdr->e_phoff);
732 for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
733 if (phdr->p_type == PT_DYNAMIC)
734 vdso->dynv = (void *)(vdso_base + phdr->p_offset);
735 if (phdr->p_type == PT_LOAD)
736 vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
738 vdso->name = vdso->shortname = "linux-gate.so.1";
745 /* Initial dso chain consists only of the app. We temporarily
746 * append the dynamic linker/libc so we can relocate it, then
747 * restore the initial chain in preparation for loading third
748 * party libraries (preload/needed). */
755 /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
757 /* Donate unused parts of app and library mapping to malloc */
758 reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]);
759 ehdr = (void *)lib->base;
760 reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff),
761 ehdr->e_phentsize, ehdr->e_phnum);
763 /* Load preload/needed libraries, add their symbols to the global
764 * namespace, and perform all remaining relocations. The main
765 * program must be relocated LAST since it may contain copy
766 * relocations which depend on libraries' relocations. */
767 if (env_preload) load_preload(env_preload);
770 reloc_all(app->next);
773 if (ldso_fail) _exit(127);
774 if (ldd_mode) _exit(0);
776 /* Switch to runtime mode: any further failures in the dynamic
777 * linker are a reportable failure rather than a fatal startup
778 * error. If the dynamic loader (dlopen) will not be used, free
779 * all memory used by the dynamic linker. */
782 #ifndef DYNAMIC_IS_RO
783 for (i=0; app->dynv[i]; i+=2)
784 if (app->dynv[i]==DT_DEBUG)
785 app->dynv[i+1] = (size_t)&debug;
788 debug.bp = _dl_debug_state;
790 debug.base = lib->base;
794 /* Stand-in until real TLS support is added to dynamic linker */
795 __libc.tls_size = sizeof(struct pthread) + 4*sizeof(size_t);
796 if (ssp_used) __init_ssp(auxv);
803 reclaim((void *)builtin_dsos, 0, sizeof builtin_dsos);
807 return (void *)aux[AT_ENTRY];
810 void *__copy_tls(unsigned char *mem, size_t cnt)
815 void *dlopen(const char *file, int mode)
817 struct dso *volatile p, *orig_tail = tail, *next;
821 if (!file) return head;
823 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
824 pthread_rwlock_wrlock(&lock);
826 if (setjmp(rtld_fail)) {
827 /* Clean up anything new that was (partially) loaded */
828 if (p->deps) for (i=0; p->deps[i]; i++)
829 if (p->deps[i]->global < 0)
830 p->deps[i]->global = 0;
831 for (p=orig_tail->next; p; p=next) {
833 munmap(p->map, p->map_len);
842 } else p = load_library(file);
845 snprintf(errbuf, sizeof errbuf,
846 "Error loading shared library %s: %m", file);
851 /* First load handling */
854 if (p->deps) for (i=0; p->deps[i]; i++)
855 if (!p->deps[i]->global)
856 p->deps[i]->global = -1;
857 if (!p->global) p->global = -1;
859 if (p->deps) for (i=0; p->deps[i]; i++)
860 if (p->deps[i]->global < 0)
861 p->deps[i]->global = 0;
862 if (p->global < 0) p->global = 0;
865 if (mode & RTLD_GLOBAL) {
866 if (p->deps) for (i=0; p->deps[i]; i++)
867 p->deps[i]->global = 1;
871 if (ssp_used) __init_ssp(auxv);
877 pthread_rwlock_unlock(&lock);
878 pthread_setcancelstate(cs, 0);
882 static void *do_dlsym(struct dso *p, const char *s, void *ra)
885 uint32_t h = 0, gh = 0;
887 if (p == RTLD_NEXT) {
888 for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
890 void *res = find_sym(p->next, s, 0);
891 if (!res) goto failed;
894 if (p == head || p == RTLD_DEFAULT) {
895 void *res = find_sym(head, s, 0);
896 if (!res) goto failed;
901 sym = gnu_lookup(s, gh, p);
904 sym = sysv_lookup(s, h, p);
906 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
907 return p->base + sym->st_value;
908 if (p->deps) for (i=0; p->deps[i]; i++) {
909 if (p->deps[i]->ghashtab) {
910 if (!gh) gh = gnu_hash(s);
911 sym = gnu_lookup(s, gh, p->deps[i]);
913 if (!h) h = sysv_hash(s);
914 sym = sysv_lookup(s, h, p->deps[i]);
916 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
917 return p->deps[i]->base + sym->st_value;
921 snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s);
925 int __dladdr(void *addr, Dl_info *info)
935 pthread_rwlock_rdlock(&lock);
936 for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next);
937 pthread_rwlock_unlock(&lock);
942 strings = p->strings;
944 nsym = p->hashtab[1];
948 buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
949 sym += p->ghashtab[1];
950 for (i = 0; i < p->ghashtab[0]; i++) {
951 if (buckets[i] > nsym)
955 nsym -= p->ghashtab[1];
956 hashval = buckets + p->ghashtab[0] + nsym;
958 while (!(*hashval++ & 1));
962 for (; nsym; nsym--, sym++) {
963 if (sym->st_shndx && sym->st_value
964 && (1<<(sym->st_info&0xf) & OK_TYPES)
965 && (1<<(sym->st_info>>4) & OK_BINDS)) {
966 void *symaddr = p->base + sym->st_value;
967 if (symaddr > addr || symaddr < best)
970 bestname = strings + sym->st_name;
978 info->dli_fname = p->name;
979 info->dli_fbase = p->base;
980 info->dli_sname = bestname;
981 info->dli_saddr = best;
986 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
989 pthread_rwlock_rdlock(&lock);
990 res = do_dlsym(p, s, ra);
991 pthread_rwlock_unlock(&lock);
995 void *dlopen(const char *file, int mode)
999 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
1003 int __dladdr (void *addr, Dl_info *info)
1011 if (!errflag) return 0;
1016 int dlclose(void *p)