1 /* vi: set sw=4 ts=4: */
3 * This file contains the helper routines to load an ELF shared
4 * library into memory and add the symbol table info to the chain.
6 * Copyright (C) 2000-2006 by Erik Andersen <andersen@codepoet.org>
7 * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
8 * David Engel, Hongjiu Lu and Mitch D'Souza
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. The name of the above contributors may not be
16 * used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #ifdef __LDSO_CACHE_SUPPORT__
37 static caddr_t _dl_cache_addr = NULL;
38 static size_t _dl_cache_size = 0;
40 int _dl_map_cache(void)
48 if (_dl_cache_addr == MAP_FAILED)
50 else if (_dl_cache_addr != NULL)
53 if (_dl_stat(LDSO_CACHE, &st)
54 || (fd = _dl_open(LDSO_CACHE, O_RDONLY|O_CLOEXEC, 0)) < 0) {
55 _dl_cache_addr = MAP_FAILED; /* so we won't try again */
59 _dl_cache_size = st.st_size;
60 _dl_cache_addr = _dl_mmap(0, _dl_cache_size, PROT_READ, LDSO_CACHE_MMAP_FLAGS, fd, 0);
62 if (_dl_mmap_check_error(_dl_cache_addr)) {
63 _dl_dprintf(2, "%s:%i: can't map '%s'\n",
64 _dl_progname, __LINE__, LDSO_CACHE);
68 header = (header_t *) _dl_cache_addr;
70 if (_dl_cache_size < sizeof(header_t) ||
71 _dl_memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)
72 || _dl_memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)
74 (sizeof(header_t) + header->nlibs * sizeof(libentry_t))
75 || _dl_cache_addr[_dl_cache_size - 1] != '\0')
77 _dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname,
82 strtabsize = _dl_cache_size - sizeof(header_t) -
83 header->nlibs * sizeof(libentry_t);
84 libent = (libentry_t *) & header[1];
86 for (i = 0; i < header->nlibs; i++) {
87 if (libent[i].sooffset >= strtabsize ||
88 libent[i].liboffset >= strtabsize)
90 _dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname, LDSO_CACHE);
98 _dl_munmap(_dl_cache_addr, _dl_cache_size);
99 _dl_cache_addr = MAP_FAILED;
103 int _dl_unmap_cache(void)
105 if (_dl_cache_addr == NULL || _dl_cache_addr == MAP_FAILED)
109 _dl_munmap(_dl_cache_addr, _dl_cache_size);
110 _dl_cache_addr = NULL;
119 _dl_protect_relro (struct elf_resolve *l)
121 ElfW(Addr) base = (ElfW(Addr)) DL_RELOC_ADDR(l->loadaddr, l->relro_addr);
122 ElfW(Addr) start = (base & PAGE_ALIGN);
123 ElfW(Addr) end = ((base + l->relro_size) & PAGE_ALIGN);
124 _dl_if_debug_dprint("RELRO protecting %s: start:%x, end:%x\n", l->libname, start, end);
126 _dl_mprotect ((void *) start, end - start, PROT_READ) < 0) {
127 _dl_dprintf(2, "%s: cannot apply additional memory protection after relocation", l->libname);
132 /* This function's behavior must exactly match that
133 * in uClibc/ldso/util/ldd.c */
134 static struct elf_resolve *
135 search_for_named_library(const char *name, int secure, const char *path_list,
136 struct dyn_elf **rpnt)
138 char *path, *path_n, *mylibname;
139 struct elf_resolve *tpnt;
145 /* We need a writable copy of this string, but we don't
146 * need this allocated permanently since we don't want
147 * to leak memory, so use alloca to put path on the stack */
148 done = _dl_strlen(path_list);
149 path = alloca(done + 1);
151 /* another bit of local storage */
152 mylibname = alloca(2050);
154 _dl_memcpy(path, path_list, done+1);
156 /* Unlike ldd.c, don't bother to eliminate double //s */
158 /* Replace colons with zeros in path_list */
159 /* : at the beginning or end of path maps to CWD */
160 /* :: anywhere maps CWD */
172 _dl_strcpy(mylibname, path_n);
174 _dl_strcpy(mylibname, "."); /* Assume current dir if empty path */
175 _dl_strcat(mylibname, "/");
176 _dl_strcat(mylibname, name);
177 if ((tpnt = _dl_load_elf_shared_library(secure, rpnt, mylibname)) != NULL)
186 /* Used to return error codes back to dlopen et. al. */
187 unsigned long _dl_error_number;
188 unsigned long _dl_internal_error_number;
190 struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt,
191 struct elf_resolve *tpnt, char *full_libname, int __attribute__((unused)) trace_loaded_objects)
194 struct elf_resolve *tpnt1;
197 _dl_internal_error_number = 0;
198 libname = full_libname;
200 /* quick hack to ensure mylibname buffer doesn't overflow. don't
201 allow full_libname or any directory to be longer than 1024. */
202 if (_dl_strlen(full_libname) > 1024)
205 /* Skip over any initial initial './' and '/' stuff to
206 * get the short form libname with no path garbage */
207 pnt = _dl_strrchr(libname, '/');
212 _dl_if_debug_dprint("\tfind library='%s'; searching\n", libname);
213 /* If the filename has any '/', try it straight and leave it at that.
214 For IBCS2 compatibility under linux, we substitute the string
215 /usr/i486-sysv4/lib for /usr/lib in library names. */
217 if (libname != full_libname) {
218 _dl_if_debug_dprint("\ttrying file='%s'\n", full_libname);
219 tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname);
226 * The ABI specifies that RPATH is searched before LD_LIBRARY_PATH or
227 * the default path of /usr/lib. Check in rpath directories.
229 #ifdef __LDSO_RUNPATH__
230 pnt = (tpnt ? (char *) tpnt->dynamic_info[DT_RPATH] : NULL);
232 pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
233 _dl_if_debug_dprint("\tsearching RPATH='%s'\n", pnt);
234 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
239 /* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
240 if (_dl_library_path) {
241 _dl_if_debug_dprint("\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
242 if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt)) != NULL)
249 * The ABI specifies that RUNPATH is searched after LD_LIBRARY_PATH.
251 #ifdef __LDSO_RUNPATH__
252 pnt = (tpnt ? (char *)tpnt->dynamic_info[DT_RUNPATH] : NULL);
254 pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
255 _dl_if_debug_dprint("\tsearching RUNPATH='%s'\n", pnt);
256 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
262 * Where should the cache be searched? There is no such concept in the
263 * ABI, so we have some flexibility here. For now, search it before
264 * the hard coded paths that follow (i.e before /lib and /usr/lib).
266 #ifdef __LDSO_CACHE_SUPPORT__
267 if (_dl_cache_addr != NULL && _dl_cache_addr != MAP_FAILED) {
269 header_t *header = (header_t *) _dl_cache_addr;
270 libentry_t *libent = (libentry_t *) & header[1];
271 char *strs = (char *) &libent[header->nlibs];
273 _dl_if_debug_dprint("\tsearching cache='%s'\n", LDSO_CACHE);
274 for (i = 0; i < header->nlibs; i++) {
275 if ((libent[i].flags == LIB_ELF
276 || libent[i].flags == LIB_ELF_LIBC0
277 || libent[i].flags == LIB_ELF_LIBC5)
278 && _dl_strcmp(libname, strs + libent[i].sooffset) == 0
279 && (tpnt1 = _dl_load_elf_shared_library(secure, rpnt, strs + libent[i].liboffset))
287 /* Look for libraries wherever the shared library loader
289 _dl_if_debug_dprint("\tsearching ldso dir='%s'\n", _dl_ldsopath);
290 tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt);
294 /* Lastly, search the standard list of paths for the library.
295 This list must exactly match the list in uClibc/ldso/util/ldd.c */
296 _dl_if_debug_dprint("\tsearching full lib path list\n");
297 tpnt1 = search_for_named_library(libname, secure,
298 UCLIBC_RUNTIME_PREFIX "lib:"
299 UCLIBC_RUNTIME_PREFIX "usr/lib"
300 #ifndef __LDSO_CACHE_SUPPORT__
301 ":" UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib"
308 /* Well, we shot our wad on that one. All we can do now is punt */
309 if (_dl_internal_error_number)
310 _dl_error_number = _dl_internal_error_number;
312 _dl_error_number = LD_ERROR_NOFILE;
313 _dl_if_debug_dprint("Bummer: could not find '%s'!\n", libname);
319 * Read one ELF library into memory, mmap it into the correct locations and
320 * add the symbol info to the symbol chain. Perform any relocations that
324 struct elf_resolve *_dl_load_elf_shared_library(int secure,
325 struct dyn_elf **rpnt, char *libname)
328 unsigned long dynamic_addr = 0;
330 struct elf_resolve *tpnt;
332 #if defined(USE_TLS) && USE_TLS
333 ElfW(Phdr) *tlsppnt = NULL;
335 char *status, *header;
336 unsigned long dynamic_info[DYNAMIC_SIZE];
338 unsigned long libaddr;
339 unsigned long minvma = 0xffffffff, maxvma = 0;
340 unsigned int rtld_flags;
341 int i, flags, piclib, infile;
342 ElfW(Addr) relro_addr = 0;
343 size_t relro_size = 0;
346 DL_LOADADDR_TYPE lib_loadaddr;
347 DL_INIT_LOADADDR_EXTRA_DECLS
350 infile = _dl_open(libname, O_RDONLY, 0);
352 _dl_internal_error_number = LD_ERROR_NOFILE;
356 if (_dl_fstat(infile, &st) < 0) {
357 _dl_internal_error_number = LD_ERROR_NOFILE;
361 /* If we are in secure mode (i.e. a setu/gid binary using LD_PRELOAD),
362 we don't load the library if it isn't setuid. */
364 if (!(st.st_mode & S_ISUID)) {
370 /* Check if file is already loaded */
371 for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
372 if (tpnt->st_dev == st.st_dev && tpnt->st_ino == st.st_ino) {
379 header = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
380 MAP_PRIVATE | MAP_ANONYMOUS | MAP_UNINITIALIZE, -1, 0);
381 if (_dl_mmap_check_error(header)) {
382 _dl_dprintf(2, "%s:%i: can't map '%s'\n", _dl_progname, __LINE__, libname);
383 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
388 _dl_read(infile, header, _dl_pagesize);
389 epnt = (ElfW(Ehdr) *) (intptr_t) header;
390 p32 = (uint32_t*)&epnt->e_ident;
391 if (*p32 != ELFMAG_U32) {
392 _dl_dprintf(2, "%s: '%s' is not an ELF file\n", _dl_progname,
394 _dl_internal_error_number = LD_ERROR_NOTELF;
396 _dl_munmap(header, _dl_pagesize);
400 if ((epnt->e_type != ET_DYN) || (epnt->e_machine != MAGIC1
402 && epnt->e_machine != MAGIC2
406 _dl_internal_error_number =
407 (epnt->e_type != ET_DYN ? LD_ERROR_NOTDYN : LD_ERROR_NOTMAGIC);
408 _dl_dprintf(2, "%s: '%s' is not an ELF executable for " ELF_TARGET
409 "\n", _dl_progname, libname);
411 _dl_munmap(header, _dl_pagesize);
415 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
418 for (i = 0; i < epnt->e_phnum; i++) {
420 if (ppnt->p_type == PT_DYNAMIC) {
422 _dl_dprintf(2, "%s: '%s' has more than one dynamic section\n",
423 _dl_progname, libname);
424 dynamic_addr = ppnt->p_vaddr;
427 if (ppnt->p_type == PT_LOAD) {
428 /* See if this is a PIC library. */
429 if (i == 0 && ppnt->p_vaddr > 0x1000000) {
431 minvma = ppnt->p_vaddr;
433 if (piclib && ppnt->p_vaddr < minvma) {
434 minvma = ppnt->p_vaddr;
436 if (((unsigned long) ppnt->p_vaddr + ppnt->p_memsz) > maxvma) {
437 maxvma = ppnt->p_vaddr + ppnt->p_memsz;
440 if (ppnt->p_type == PT_TLS) {
441 #if defined(USE_TLS) && USE_TLS
442 if (ppnt->p_memsz == 0)
443 /* Nothing to do for an empty segment. */
446 /* Save for after 'tpnt' is actually allocated. */
450 * Yup, the user was an idiot and tried to sneak in a library with
451 * TLS in it and we don't support it. Let's fall on our own sword
452 * and scream at the luser while we die.
454 _dl_dprintf(2, "%s: '%s' library contains unsupported TLS\n",
455 _dl_progname, libname);
456 _dl_internal_error_number = LD_ERROR_TLS_FAILED;
458 _dl_munmap(header, _dl_pagesize);
465 DL_CHECK_LIB_TYPE (epnt, piclib, _dl_progname, libname);
467 maxvma = (maxvma + ADDR_ALIGN) & PAGE_ALIGN;
468 minvma = minvma & ~ADDR_ALIGN;
470 flags = MAP_PRIVATE /*| MAP_DENYWRITE */ ;
474 if (piclib == 0 || piclib == 1) {
475 status = (char *) _dl_mmap((char *) (piclib ? 0 : minvma),
476 maxvma - minvma, PROT_NONE, flags | MAP_ANONYMOUS, -1, 0);
477 if (_dl_mmap_check_error(status)) {
478 _dl_dprintf(2, "%s:%i: can't map '%s'\n", _dl_progname, __LINE__, libname);
479 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
481 _dl_munmap(header, _dl_pagesize);
484 libaddr = (unsigned long) status;
488 /* Get the memory to store the library */
489 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
491 DL_INIT_LOADADDR(lib_loadaddr, libaddr, ppnt, epnt->e_phnum);
493 for (i = 0; i < epnt->e_phnum; i++) {
494 if (DL_IS_SPECIAL_SEGMENT (epnt, ppnt)) {
497 addr = DL_MAP_SEGMENT (epnt, ppnt, infile, flags);
501 DL_INIT_LOADADDR_HDR (lib_loadaddr, addr, ppnt);
505 if (ppnt->p_type == PT_GNU_RELRO) {
506 relro_addr = ppnt->p_vaddr;
507 relro_size = ppnt->p_memsz;
509 if (ppnt->p_type == PT_LOAD) {
513 /* See if this is a PIC library. */
514 if (i == 0 && ppnt->p_vaddr > 0x1000000) {
516 /* flags |= MAP_FIXED; */
519 if (ppnt->p_flags & PF_W) {
520 unsigned long map_size;
522 char *piclib2map = 0;
525 /* We might be able to avoid this
526 call if memsz doesn't require
527 an additional page, but this
528 would require mmap to always
529 return page-aligned addresses
530 and a whole number of pages
531 allocated. Unfortunately on
532 uClinux may return misaligned
533 addresses and may allocate
534 partial pages, so we may end up
535 doing unnecessary mmap calls.
537 This is what we could do if we
538 knew mmap would always return
541 ((ppnt->p_vaddr + ppnt->p_filesz
544 < ppnt->p_vaddr + ppnt->p_memsz)
546 Instead, we have to do this: */
547 ppnt->p_filesz < ppnt->p_memsz)
549 piclib2map = (char *)
550 _dl_mmap(0, (ppnt->p_vaddr & ADDR_ALIGN)
552 LXFLAGS(ppnt->p_flags),
553 flags | MAP_ANONYMOUS, -1, 0);
554 if (_dl_mmap_check_error(piclib2map))
557 (lib_loadaddr, piclib2map
558 + (ppnt->p_vaddr & ADDR_ALIGN), ppnt);
561 tryaddr = piclib == 2 ? piclib2map
562 : ((char*) (piclib ? libaddr : 0) +
563 (ppnt->p_vaddr & PAGE_ALIGN));
565 size = (ppnt->p_vaddr & ADDR_ALIGN)
568 /* For !MMU, mmap to fixed address will fail.
569 So instead of desperately call mmap and fail,
570 we set status to MAP_FAILED to save a call
572 #ifndef __ARCH_USE_MMU__
575 status = (char *) _dl_mmap
576 (tryaddr, size, LXFLAGS(ppnt->p_flags),
577 flags | (piclib2map ? MAP_FIXED : 0),
578 infile, ppnt->p_offset & OFFS_ALIGN);
579 #ifndef __ARCH_USE_MMU__
584 if (_dl_mmap_check_error(status) && piclib2map
585 && (_DL_PREAD (infile, tryaddr, size,
586 ppnt->p_offset & OFFS_ALIGN)
590 if (_dl_mmap_check_error(status)
591 || (tryaddr && tryaddr != status)) {
593 _dl_dprintf(2, "%s:%i: can't map '%s'\n",
594 _dl_progname, __LINE__, libname);
595 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
596 DL_LOADADDR_UNMAP (lib_loadaddr, maxvma - minvma);
598 _dl_munmap(header, _dl_pagesize);
604 (lib_loadaddr, status
605 + (ppnt->p_vaddr & ADDR_ALIGN), ppnt);
607 /* Now we want to allocate and
608 zero-out any data from the end of
609 the region we mapped in from the
610 file (filesz) to the end of the
611 loadable segment (memsz). We may
612 need additional pages for memsz,
613 that we map in below, and we can
614 count on the kernel to zero them
615 out, but we have to zero out stuff
616 in the last page that we mapped in
617 from the file. However, we can't
618 assume to have actually obtained
619 full pages from the kernel, since
620 we didn't ask for them, and uClibc
621 may not give us full pages for
622 small allocations. So only zero
623 out up to memsz or the end of the
624 page, whichever comes first. */
626 /* CPNT is the beginning of the memsz
627 portion not backed by filesz. */
628 cpnt = (char *) (status + size);
630 /* MAP_SIZE is the address of the
631 beginning of the next page. */
632 map_size = (ppnt->p_vaddr + ppnt->p_filesz
633 + ADDR_ALIGN) & PAGE_ALIGN;
636 # define MIN(a,b) ((a) < (b) ? (a) : (b))
645 if (map_size < ppnt->p_vaddr + ppnt->p_memsz
647 tryaddr = map_size + (char*)(piclib ? libaddr : 0);
648 status = (char *) _dl_mmap(tryaddr,
649 ppnt->p_vaddr + ppnt->p_memsz - map_size,
650 LXFLAGS(ppnt->p_flags), flags | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
651 if (_dl_mmap_check_error(status)
652 || tryaddr != status)
656 tryaddr = (piclib == 2 ? 0
657 : (char *) (ppnt->p_vaddr & PAGE_ALIGN)
658 + (piclib ? libaddr : 0));
659 size = (ppnt->p_vaddr & ADDR_ALIGN) + ppnt->p_filesz;
660 status = (char *) _dl_mmap
661 (tryaddr, size, LXFLAGS(ppnt->p_flags),
662 flags | (piclib == 2 ? MAP_EXECUTABLE
663 | MAP_DENYWRITE : 0),
664 infile, ppnt->p_offset & OFFS_ALIGN);
665 if (_dl_mmap_check_error(status)
666 || (tryaddr && tryaddr != status))
669 (lib_loadaddr, status
670 + (ppnt->p_vaddr & ADDR_ALIGN), ppnt);
673 /* if (libaddr == 0 && piclib) {
674 libaddr = (unsigned long) status;
682 /* For a non-PIC library, the addresses are all absolute */
684 dynamic_addr = (unsigned long) DL_RELOC_ADDR(lib_loadaddr, dynamic_addr);
688 * OK, the ELF library is now loaded into VM in the correct locations
689 * The next step is to go through and do the dynamic linking (if needed).
692 /* Start by scanning the dynamic section to get all of the pointers */
695 _dl_internal_error_number = LD_ERROR_NODYNAMIC;
696 _dl_dprintf(2, "%s: '%s' is missing a dynamic section\n",
697 _dl_progname, libname);
698 _dl_munmap(header, _dl_pagesize);
702 dpnt = (ElfW(Dyn) *) dynamic_addr;
703 _dl_memset(dynamic_info, 0, sizeof(dynamic_info));
704 rtld_flags = _dl_parse_dynamic_info(dpnt, dynamic_info, NULL, lib_loadaddr);
705 /* If the TEXTREL is set, this means that we need to make the pages
706 writable before we perform relocations. Do this now. They get set
709 if (dynamic_info[DT_TEXTREL]) {
710 #ifndef __FORCE_SHAREABLE_TEXT_SEGMENTS__
711 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
712 for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
713 if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W)) {
714 _dl_mprotect((void *) ((piclib ? libaddr : 0) +
715 (ppnt->p_vaddr & PAGE_ALIGN)),
716 (ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz,
717 PROT_READ | PROT_WRITE | PROT_EXEC);
721 _dl_dprintf(_dl_debug_file, "Can't modify %s's text section."
722 " Use GCC option -fPIC for shared objects, please.\n",
728 tpnt = _dl_add_elf_hash_table(libname, lib_loadaddr, dynamic_info,
730 tpnt->relro_addr = relro_addr;
731 tpnt->relro_size = relro_size;
732 tpnt->st_dev = st.st_dev;
733 tpnt->st_ino = st.st_ino;
734 tpnt->ppnt = (ElfW(Phdr) *) DL_RELOC_ADDR(tpnt->loadaddr, epnt->e_phoff);
735 tpnt->n_phent = epnt->e_phnum;
736 tpnt->rtld_flags |= rtld_flags;
738 #if defined(USE_TLS) && USE_TLS
740 _dl_debug_early("Found TLS header for %s\n", libname);
741 # if NO_TLS_OFFSET != 0
742 tpnt->l_tls_offset = NO_TLS_OFFSET;
744 tpnt->l_tls_blocksize = tlsppnt->p_memsz;
745 tpnt->l_tls_align = tlsppnt->p_align;
746 if (tlsppnt->p_align == 0)
747 tpnt->l_tls_firstbyte_offset = 0;
749 tpnt->l_tls_firstbyte_offset = tlsppnt->p_vaddr &
750 (tlsppnt->p_align - 1);
751 tpnt->l_tls_initimage_size = tlsppnt->p_filesz;
752 tpnt->l_tls_initimage = (void *) tlsppnt->p_vaddr;
754 /* Assign the next available module ID. */
755 tpnt->l_tls_modid = _dl_next_tls_modid ();
757 /* We know the load address, so add it to the offset. */
758 if (tpnt->l_tls_initimage != NULL)
760 # ifdef __SUPPORT_LD_DEBUG_EARLY__
761 unsigned int tmp = (unsigned int) tpnt->l_tls_initimage;
762 tpnt->l_tls_initimage = (char *) tlsppnt->p_vaddr + tpnt->loadaddr;
763 _dl_debug_early("Relocated TLS initial image from %x to %x (size = %x)\n", tmp, tpnt->l_tls_initimage, tpnt->l_tls_initimage_size);
766 tpnt->l_tls_initimage = (char *) tlsppnt->p_vaddr + tpnt->loadaddr;
773 * Add this object into the symbol chain
776 (*rpnt)->next = _dl_malloc(sizeof(struct dyn_elf));
777 _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
778 (*rpnt)->next->prev = (*rpnt);
779 *rpnt = (*rpnt)->next;
782 /* When statically linked, the first time we dlopen a DSO
783 * the *rpnt is NULL, so we need to allocate memory for it,
784 * and initialize the _dl_symbol_table.
787 *rpnt = _dl_symbol_tables = _dl_malloc(sizeof(struct dyn_elf));
788 _dl_memset(*rpnt, 0, sizeof(struct dyn_elf));
792 tpnt->symbol_scope = _dl_symbol_tables;
794 tpnt->libtype = elf_lib;
797 * OK, the next thing we need to do is to insert the dynamic linker into
798 * the proper entry in the GOT so that the PLT symbols can be properly
802 lpnt = (unsigned long *) dynamic_info[DT_PLTGOT];
805 lpnt = (unsigned long *) (dynamic_info[DT_PLTGOT]);
806 INIT_GOT(lpnt, tpnt);
809 _dl_if_debug_dprint("\n\tfile='%s'; generating link map\n", libname);
810 _dl_if_debug_dprint("\t\tdynamic: %x base: %x\n", dynamic_addr, DL_LOADADDR_BASE(lib_loadaddr));
811 _dl_if_debug_dprint("\t\t entry: %x phdr: %x phnum: %x\n\n",
812 DL_RELOC_ADDR(lib_loadaddr, epnt->e_entry), tpnt->ppnt, tpnt->n_phent);
814 _dl_munmap(header, _dl_pagesize);
819 /* now_flag must be RTLD_NOW or zero */
820 int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
823 struct elf_resolve *tpnt;
824 ElfW(Word) reloc_size, relative_count;
825 ElfW(Addr) reloc_addr;
828 goof = _dl_fixup(rpnt->next, now_flag);
833 if (!(tpnt->init_flag & RELOCS_DONE))
834 _dl_if_debug_dprint("relocation processing: %s\n", tpnt->libname);
836 if (unlikely(tpnt->dynamic_info[UNSUPPORTED_RELOC_TYPE])) {
837 _dl_if_debug_dprint("%s: can't handle %s relocation records\n",
838 _dl_progname, UNSUPPORTED_RELOC_STR);
843 reloc_size = tpnt->dynamic_info[DT_RELOC_TABLE_SIZE];
844 /* On some machines, notably SPARC & PPC, DT_REL* includes DT_JMPREL in its
845 range. Note that according to the ELF spec, this is completely legal! */
846 #ifdef ELF_MACHINE_PLTREL_OVERLAP
847 reloc_size -= tpnt->dynamic_info [DT_PLTRELSZ];
849 if (tpnt->dynamic_info[DT_RELOC_TABLE_ADDR] &&
850 !(tpnt->init_flag & RELOCS_DONE)) {
851 reloc_addr = tpnt->dynamic_info[DT_RELOC_TABLE_ADDR];
852 relative_count = tpnt->dynamic_info[DT_RELCONT_IDX];
853 if (relative_count) { /* Optimize the XX_RELATIVE relocations if possible */
854 reloc_size -= relative_count * sizeof(ELF_RELOC);
855 elf_machine_relative(tpnt->loadaddr, reloc_addr, relative_count);
856 reloc_addr += relative_count * sizeof(ELF_RELOC);
858 goof += _dl_parse_relocation_information(rpnt,
861 tpnt->init_flag |= RELOCS_DONE;
863 if (tpnt->dynamic_info[DT_BIND_NOW])
865 if (tpnt->dynamic_info[DT_JMPREL] &&
866 (!(tpnt->init_flag & JMP_RELOCS_DONE) ||
867 (now_flag && !(tpnt->rtld_flags & now_flag)))) {
868 tpnt->rtld_flags |= now_flag;
869 if (!(tpnt->rtld_flags & RTLD_NOW)) {
870 _dl_parse_lazy_relocation_information(rpnt,
871 tpnt->dynamic_info[DT_JMPREL],
872 tpnt->dynamic_info [DT_PLTRELSZ]);
874 goof += _dl_parse_relocation_information(rpnt,
875 tpnt->dynamic_info[DT_JMPREL],
876 tpnt->dynamic_info[DT_PLTRELSZ]);
878 tpnt->init_flag |= JMP_RELOCS_DONE;
882 /* _dl_add_to_slotinfo is called by init_tls() for initial DSO
883 or by dlopen() for dynamically loaded DSO. */
884 #if defined(USE_TLS) && USE_TLS
885 /* Add object to slot information data if necessasy. */
886 if (tpnt->l_tls_blocksize != 0 && tls_init_tp_called)
887 _dl_add_to_slotinfo ((struct link_map *) tpnt);
893 /* Minimal printf which handles only %s, %d, and %x */
894 void _dl_dprintf(int fd, const char *fmt, ...)
902 char *start, *ptr, *string;
908 buf = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
909 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
910 if (_dl_mmap_check_error(buf)) {
911 _dl_write(fd, "mmap of a spare page failed!\n", 29);
917 if (_dl_strlen(fmt) >= (_dl_pagesize - 1)) {
918 _dl_write(fd, "overflow\n", 11);
922 _dl_strcpy(buf, fmt);
926 while (*ptr != '%' && *ptr) {
932 _dl_write(fd, start, _dl_strlen(start));
936 string = va_arg(args, char *);
939 _dl_write(fd, "(null)", 6);
941 _dl_write(fd, string, _dl_strlen(string));
949 num = va_arg(args, long int);
951 num = va_arg(args, int);
953 string = _dl_simple_ltoa(tmp, num);
954 _dl_write(fd, string, _dl_strlen(string));
962 num = va_arg(args, long int);
964 num = va_arg(args, int);
966 string = _dl_simple_ltoahex(tmp, num);
967 _dl_write(fd, string, _dl_strlen(string));
971 _dl_write(fd, "(null)", 6);
977 _dl_write(fd, start, _dl_strlen(start));
981 _dl_munmap(buf, _dl_pagesize);
985 char *_dl_strdup(const char *string)
990 len = _dl_strlen(string);
991 retval = _dl_malloc(len + 1);
992 _dl_strcpy(retval, string);
996 unsigned int _dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
997 void *debug_addr, DL_LOADADDR_TYPE load_off)
999 return __dl_parse_dynamic_info(dpnt, dynamic_info, debug_addr, load_off);