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) 2000-2004 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 == (caddr_t) - 1)
50 else if (_dl_cache_addr != NULL)
53 if (_dl_stat(LDSO_CACHE, &st)
54 || (fd = _dl_open(LDSO_CACHE, O_RDONLY, 0)) < 0) {
55 _dl_cache_addr = (caddr_t) - 1; /* so we won't try again */
59 _dl_cache_size = st.st_size;
60 _dl_cache_addr = (caddr_t) _dl_mmap(0, _dl_cache_size, PROT_READ, MAP_SHARED, fd, 0);
62 if (_dl_mmap_check_error(_dl_cache_addr)) {
63 _dl_dprintf(2, "%s: can't map cache '%s'\n",
64 _dl_progname, 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 = (caddr_t) - 1;
103 int _dl_unmap_cache(void)
105 if (_dl_cache_addr == NULL || _dl_cache_addr == (caddr_t) - 1)
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) start = ((l->loadaddr + l->relro_addr)
122 & ~(_dl_pagesize - 1));
123 ElfW(Addr) end = ((l->loadaddr + l->relro_addr + l->relro_size)
124 & ~(_dl_pagesize - 1));
125 _dl_if_debug_dprint("RELRO protecting %s: start:%x, end:%x\n", l->libname, start, end);
127 _dl_mprotect ((void *) start, end - start, PROT_READ) < 0) {
128 _dl_dprintf(2, "%s: cannot apply additional memory protection after relocation", l->libname);
133 /* This function's behavior must exactly match that
134 * in uClibc/ldso/util/ldd.c */
135 static struct elf_resolve *
136 search_for_named_library(const char *name, int secure, const char *path_list,
137 struct dyn_elf **rpnt)
140 char mylibname[2050];
141 struct elf_resolve *tpnt;
147 /* We need a writable copy of this string */
148 path = _dl_strdup(path_list);
150 _dl_dprintf(2, "Out of memory!\n");
154 /* Unlike ldd.c, don't bother to eliminate double //s */
156 /* Replace colons with zeros in path_list */
157 /* : at the beginning or end of path maps to CWD */
158 /* :: anywhere maps CWD */
169 _dl_strcpy(mylibname, path_n);
171 _dl_strcpy(mylibname, "."); /* Assume current dir if empty path */
172 _dl_strcat(mylibname, "/");
173 _dl_strcat(mylibname, name);
174 if ((tpnt = _dl_load_elf_shared_library(secure, rpnt, mylibname)) != NULL)
183 /* Check if the named library is already loaded... */
184 struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname,
185 int trace_loaded_objects)
187 const char *pnt, *pnt1;
188 struct elf_resolve *tpnt1;
189 const char *libname, *libname2;
190 static const char libc[] = "libc.so.";
191 static const char aborted_wrong_lib[] = "%s: aborted attempt to load %s!\n";
193 pnt = libname = full_libname;
195 _dl_if_debug_dprint("Checking if '%s' is already loaded\n", full_libname);
196 /* quick hack to ensure mylibname buffer doesn't overflow. don't
197 allow full_libname or any directory to be longer than 1024. */
198 if (_dl_strlen(full_libname) > 1024)
201 /* Skip over any initial initial './' and '/' stuff to
202 * get the short form libname with no path garbage */
203 pnt1 = _dl_strrchr(pnt, '/');
208 /* Make sure they are not trying to load the wrong C library!
209 * This sometimes happens esp with shared libraries when the
210 * library path is somehow wrong! */
211 #define isdigit(c) (c >= '0' && c <= '9')
212 if ((_dl_strncmp(libname, libc, 8) == 0) && _dl_strlen(libname) >=8 &&
215 /* Abort attempts to load glibc, libc5, etc */
216 if ( libname[8]!='0') {
217 if (!trace_loaded_objects) {
218 _dl_dprintf(2, aborted_wrong_lib, libname, _dl_progname);
225 /* Critical step! Weed out duplicates early to avoid
226 * function aliasing, which wastes memory, and causes
227 * really bad things to happen with weaks and globals. */
228 for (tpnt1 = _dl_loaded_modules; tpnt1; tpnt1 = tpnt1->next) {
230 /* Skip over any initial initial './' and '/' stuff to
231 * get the short form libname with no path garbage */
232 libname2 = tpnt1->libname;
233 pnt1 = _dl_strrchr(libname2, '/');
238 if (_dl_strcmp(libname2, libname) == 0) {
239 /* Well, that was certainly easy */
248 /* Used to return error codes back to dlopen et. al. */
249 unsigned long _dl_error_number;
250 unsigned long _dl_internal_error_number;
252 struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt,
253 struct elf_resolve *tpnt, char *full_libname, int __attribute__((unused)) trace_loaded_objects)
256 struct elf_resolve *tpnt1;
259 _dl_internal_error_number = 0;
260 libname = full_libname;
262 /* quick hack to ensure mylibname buffer doesn't overflow. don't
263 allow full_libname or any directory to be longer than 1024. */
264 if (_dl_strlen(full_libname) > 1024)
267 /* Skip over any initial initial './' and '/' stuff to
268 * get the short form libname with no path garbage */
269 pnt = _dl_strrchr(libname, '/');
274 /* Critical step! Weed out duplicates early to avoid
275 * function aliasing, which wastes memory, and causes
276 * really bad things to happen with weaks and globals. */
277 if ((tpnt1=_dl_check_if_named_library_is_loaded(libname, trace_loaded_objects))!=NULL) {
278 tpnt1->usage_count++;
282 _dl_if_debug_dprint("\tfind library='%s'; searching\n", libname);
283 /* If the filename has any '/', try it straight and leave it at that.
284 For IBCS2 compatibility under linux, we substitute the string
285 /usr/i486-sysv4/lib for /usr/lib in library names. */
287 if (libname != full_libname) {
288 _dl_if_debug_dprint("\ttrying file='%s'\n", full_libname);
289 tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname);
297 * The ABI specifies that RPATH is searched before LD_LIBRARY_PATH or
298 * the default path of /usr/lib. Check in rpath directories.
300 #ifdef __LDSO_RUNPATH__
301 pnt = (tpnt ? (char *) tpnt->dynamic_info[DT_RPATH] : NULL);
303 pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
304 _dl_if_debug_dprint("\tsearching RPATH='%s'\n", pnt);
305 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
310 /* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
311 if (_dl_library_path) {
312 _dl_if_debug_dprint("\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
313 if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt)) != NULL)
320 * The ABI specifies that RUNPATH is searched after LD_LIBRARY_PATH.
322 #ifdef __LDSO_RUNPATH__
323 pnt = (tpnt ? (char *)tpnt->dynamic_info[DT_RUNPATH] : NULL);
325 pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
326 _dl_if_debug_dprint("\tsearching RUNPATH='%s'\n", pnt);
327 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
333 * Where should the cache be searched? There is no such concept in the
334 * ABI, so we have some flexibility here. For now, search it before
335 * the hard coded paths that follow (i.e before /lib and /usr/lib).
337 #ifdef __LDSO_CACHE_SUPPORT__
338 if (_dl_cache_addr != NULL && _dl_cache_addr != (caddr_t) - 1) {
340 header_t *header = (header_t *) _dl_cache_addr;
341 libentry_t *libent = (libentry_t *) & header[1];
342 char *strs = (char *) &libent[header->nlibs];
344 _dl_if_debug_dprint("\tsearching cache='%s'\n", LDSO_CACHE);
345 for (i = 0; i < header->nlibs; i++) {
346 if ((libent[i].flags == LIB_ELF ||
347 libent[i].flags == LIB_ELF_LIBC0 ||
348 libent[i].flags == LIB_ELF_LIBC5) &&
349 _dl_strcmp(libname, strs + libent[i].sooffset) == 0 &&
350 (tpnt1 = _dl_load_elf_shared_library(secure,
351 rpnt, strs + libent[i].liboffset)))
357 /* Look for libraries wherever the shared library loader
359 _dl_if_debug_dprint("\tsearching ldso dir='%s'\n", _dl_ldsopath);
360 if ((tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt)) != NULL)
366 /* Lastly, search the standard list of paths for the library.
367 This list must exactly match the list in uClibc/ldso/util/ldd.c */
368 _dl_if_debug_dprint("\tsearching full lib path list\n");
369 if ((tpnt1 = search_for_named_library(libname, secure,
370 UCLIBC_RUNTIME_PREFIX "lib:"
371 UCLIBC_RUNTIME_PREFIX "usr/lib"
372 #ifndef __LDSO_CACHE_SUPPORT__
373 ":" UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib"
382 /* Well, we shot our wad on that one. All we can do now is punt */
383 if (_dl_internal_error_number)
384 _dl_error_number = _dl_internal_error_number;
386 _dl_error_number = LD_ERROR_NOFILE;
387 #if defined (__SUPPORT_LD_DEBUG__)
388 if(_dl_debug) _dl_dprintf(2, "Bummer: could not find '%s'!\n", libname);
395 * Read one ELF library into memory, mmap it into the correct locations and
396 * add the symbol info to the symbol chain. Perform any relocations that
400 struct elf_resolve *_dl_load_elf_shared_library(int secure,
401 struct dyn_elf **rpnt, char *libname)
404 unsigned long dynamic_addr = 0;
406 struct elf_resolve *tpnt;
408 char *status, *header;
409 unsigned long dynamic_info[DYNAMIC_SIZE];
411 unsigned long libaddr;
412 unsigned long minvma = 0xffffffff, maxvma = 0;
413 int i, flags, piclib, infile;
414 ElfW(Addr) relro_addr = 0;
415 size_t relro_size = 0;
417 /* If this file is already loaded, skip this step */
418 tpnt = _dl_check_hashed_files(libname);
421 (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
422 _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
423 (*rpnt)->next->prev = (*rpnt);
424 *rpnt = (*rpnt)->next;
426 tpnt->symbol_scope = _dl_symbol_tables;
429 tpnt->libtype = elf_lib;
430 #if defined (__SUPPORT_LD_DEBUG__)
431 if(_dl_debug) _dl_dprintf(2, "file='%s'; already loaded\n", libname);
436 /* If we are in secure mode (i.e. a setu/gid binary using LD_PRELOAD),
437 we don't load the library if it isn't setuid. */
442 if (_dl_stat(libname, &st) || !(st.st_mode & S_ISUID))
447 infile = _dl_open(libname, O_RDONLY, 0);
451 * NO! When we open shared libraries we may search several paths.
452 * it is inappropriate to generate an error here.
454 _dl_dprintf(2, "%s: can't open '%s'\n", _dl_progname, libname);
456 _dl_internal_error_number = LD_ERROR_NOFILE;
460 header = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
461 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
462 if (_dl_mmap_check_error(header)) {
463 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
464 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
469 _dl_read(infile, header, _dl_pagesize);
470 epnt = (ElfW(Ehdr) *) (intptr_t) header;
471 if (epnt->e_ident[0] != 0x7f ||
472 epnt->e_ident[1] != 'E' ||
473 epnt->e_ident[2] != 'L' ||
474 epnt->e_ident[3] != 'F')
476 _dl_dprintf(2, "%s: '%s' is not an ELF file\n", _dl_progname,
478 _dl_internal_error_number = LD_ERROR_NOTELF;
480 _dl_munmap(header, _dl_pagesize);
484 if ((epnt->e_type != ET_DYN) || (epnt->e_machine != MAGIC1
486 && epnt->e_machine != MAGIC2
490 _dl_internal_error_number =
491 (epnt->e_type != ET_DYN ? LD_ERROR_NOTDYN : LD_ERROR_NOTMAGIC);
492 _dl_dprintf(2, "%s: '%s' is not an ELF executable for " ELF_TARGET
493 "\n", _dl_progname, libname);
495 _dl_munmap(header, _dl_pagesize);
499 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
502 for (i = 0; i < epnt->e_phnum; i++) {
504 if (ppnt->p_type == PT_DYNAMIC) {
506 _dl_dprintf(2, "%s: '%s' has more than one dynamic section\n",
507 _dl_progname, libname);
508 dynamic_addr = ppnt->p_vaddr;
511 if (ppnt->p_type == PT_LOAD) {
512 /* See if this is a PIC library. */
513 if (i == 0 && ppnt->p_vaddr > 0x1000000) {
515 minvma = ppnt->p_vaddr;
517 if (piclib && ppnt->p_vaddr < minvma) {
518 minvma = ppnt->p_vaddr;
520 if (((unsigned long) ppnt->p_vaddr + ppnt->p_memsz) > maxvma) {
521 maxvma = ppnt->p_vaddr + ppnt->p_memsz;
527 maxvma = (maxvma + ADDR_ALIGN) & ~ADDR_ALIGN;
528 minvma = minvma & ~0xffffU;
530 flags = MAP_PRIVATE /*| MAP_DENYWRITE */ ;
534 status = (char *) _dl_mmap((char *) (piclib ? 0 : minvma),
535 maxvma - minvma, PROT_NONE, flags | MAP_ANONYMOUS, -1, 0);
536 if (_dl_mmap_check_error(status)) {
537 _dl_dprintf(2, "%s: can't map %s\n", _dl_progname, libname);
538 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
540 _dl_munmap(header, _dl_pagesize);
543 libaddr = (unsigned long) status;
546 /* Get the memory to store the library */
547 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
549 for (i = 0; i < epnt->e_phnum; i++) {
550 if (ppnt->p_type == PT_GNU_RELRO) {
551 relro_addr = ppnt->p_vaddr;
552 relro_size = ppnt->p_memsz;
554 if (ppnt->p_type == PT_LOAD) {
556 /* See if this is a PIC library. */
557 if (i == 0 && ppnt->p_vaddr > 0x1000000) {
559 /* flags |= MAP_FIXED; */
564 if (ppnt->p_flags & PF_W) {
565 unsigned long map_size;
568 status = (char *) _dl_mmap((char *) ((piclib ? libaddr : 0) +
569 (ppnt->p_vaddr & PAGE_ALIGN)), (ppnt->p_vaddr & ADDR_ALIGN)
570 + ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags, infile,
571 ppnt->p_offset & OFFS_ALIGN);
573 if (_dl_mmap_check_error(status)) {
574 _dl_dprintf(2, "%s: can't map '%s'\n",
575 _dl_progname, libname);
576 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
577 _dl_munmap((char *) libaddr, maxvma - minvma);
579 _dl_munmap(header, _dl_pagesize);
583 /* Pad the last page with zeroes. */
584 cpnt = (char *) (status + (ppnt->p_vaddr & ADDR_ALIGN) +
586 while (((unsigned long) cpnt) & ADDR_ALIGN)
589 /* I am not quite sure if this is completely
590 * correct to do or not, but the basic way that
591 * we handle bss segments is that we mmap
592 * /dev/zero if there are any pages left over
593 * that are not mapped as part of the file */
595 map_size = (ppnt->p_vaddr + ppnt->p_filesz + ADDR_ALIGN) & PAGE_ALIGN;
597 if (map_size < ppnt->p_vaddr + ppnt->p_memsz)
598 status = (char *) _dl_mmap((char *) map_size +
599 (piclib ? libaddr : 0),
600 ppnt->p_vaddr + ppnt->p_memsz - map_size,
601 LXFLAGS(ppnt->p_flags), flags | MAP_ANONYMOUS, -1, 0);
603 status = (char *) _dl_mmap((char *) (ppnt->p_vaddr & PAGE_ALIGN)
604 + (piclib ? libaddr : 0), (ppnt->p_vaddr & ADDR_ALIGN) +
605 ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags,
606 infile, ppnt->p_offset & OFFS_ALIGN);
607 if (_dl_mmap_check_error(status)) {
608 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
609 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
610 _dl_munmap((char *) libaddr, maxvma - minvma);
612 _dl_munmap(header, _dl_pagesize);
616 /* if(libaddr == 0 && piclib) {
617 libaddr = (unsigned long) status;
625 /* For a non-PIC library, the addresses are all absolute */
627 dynamic_addr += (unsigned long) libaddr;
631 * OK, the ELF library is now loaded into VM in the correct locations
632 * The next step is to go through and do the dynamic linking (if needed).
635 /* Start by scanning the dynamic section to get all of the pointers */
638 _dl_internal_error_number = LD_ERROR_NODYNAMIC;
639 _dl_dprintf(2, "%s: '%s' is missing a dynamic section\n",
640 _dl_progname, libname);
641 _dl_munmap(header, _dl_pagesize);
645 dpnt = (ElfW(Dyn) *) dynamic_addr;
646 _dl_memset(dynamic_info, 0, sizeof(dynamic_info));
647 _dl_parse_dynamic_info(dpnt, dynamic_info, NULL, libaddr);
648 /* If the TEXTREL is set, this means that we need to make the pages
649 writable before we perform relocations. Do this now. They get set
652 if (dynamic_info[DT_TEXTREL]) {
653 #ifndef __FORCE_SHAREABLE_TEXT_SEGMENTS__
654 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
655 for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
656 if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
657 _dl_mprotect((void *) ((piclib ? libaddr : 0) +
658 (ppnt->p_vaddr & PAGE_ALIGN)),
659 (ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz,
660 PROT_READ | PROT_WRITE | PROT_EXEC);
663 _dl_dprintf(_dl_debug_file, "Can't modify %s's text section. Use GCC option -fPIC for shared objects, please.\n",libname);
668 tpnt = _dl_add_elf_hash_table(libname, (char *) libaddr, dynamic_info,
670 tpnt->relro_addr = relro_addr;
671 tpnt->relro_size = relro_size;
672 tpnt->ppnt = (ElfW(Phdr) *)(intptr_t) (tpnt->loadaddr + epnt->e_phoff);
673 tpnt->n_phent = epnt->e_phnum;
676 * Add this object into the symbol chain
679 (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
680 _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
681 (*rpnt)->next->prev = (*rpnt);
682 *rpnt = (*rpnt)->next;
684 tpnt->symbol_scope = _dl_symbol_tables;
687 tpnt->libtype = elf_lib;
690 * OK, the next thing we need to do is to insert the dynamic linker into
691 * the proper entry in the GOT so that the PLT symbols can be properly
695 lpnt = (unsigned long *) dynamic_info[DT_PLTGOT];
698 lpnt = (unsigned long *) (dynamic_info[DT_PLTGOT]);
699 INIT_GOT(lpnt, tpnt);
702 #if defined (__SUPPORT_LD_DEBUG__)
704 _dl_dprintf(2, "\n\tfile='%s'; generating link map\n", libname);
705 _dl_dprintf(2, "\t\tdynamic: %x base: %x\n",
706 dynamic_addr, libaddr);
707 _dl_dprintf(2, "\t\t entry: %x phdr: %x phnum: %x\n\n",
708 epnt->e_entry + libaddr, tpnt->ppnt, tpnt->n_phent);
712 _dl_munmap(header, _dl_pagesize);
717 /* now_flag must be RTLD_NOW or zero */
718 int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
721 struct elf_resolve *tpnt;
722 ElfW(Word) reloc_size, relative_count;
723 ElfW(Addr) reloc_addr;
726 goof += _dl_fixup(rpnt->next, now_flag);
729 if(!(tpnt->init_flag & RELOCS_DONE))
730 _dl_if_debug_dprint("relocation processing: %s\n", tpnt->libname);
732 if (unlikely(tpnt->dynamic_info[UNSUPPORTED_RELOC_TYPE])) {
733 _dl_if_debug_dprint("%s: can't handle %s relocation records\n",
734 _dl_progname, UNSUPPORTED_RELOC_STR);
739 reloc_size = tpnt->dynamic_info[DT_RELOC_TABLE_SIZE];
740 /* On some machines, notably SPARC & PPC, DT_REL* includes DT_JMPREL in its
741 range. Note that according to the ELF spec, this is completely legal! */
742 #ifdef ELF_MACHINE_PLTREL_OVERLAP
743 reloc_size -= tpnt->dynamic_info [DT_PLTRELSZ];
745 if (tpnt->dynamic_info[DT_RELOC_TABLE_ADDR] &&
746 !(tpnt->init_flag & RELOCS_DONE)) {
747 tpnt->init_flag |= RELOCS_DONE;
748 reloc_addr = tpnt->dynamic_info[DT_RELOC_TABLE_ADDR];
749 relative_count = tpnt->dynamic_info[DT_RELCONT_IDX];
750 if (relative_count) { /* Optimize the XX_RELATIVE relocations if possible */
751 reloc_size -= relative_count * sizeof(ELF_RELOC);
752 elf_machine_relative(tpnt->loadaddr, reloc_addr, relative_count);
753 reloc_addr += relative_count * sizeof(ELF_RELOC);
755 goof += _dl_parse_relocation_information(rpnt,
759 if (tpnt->dynamic_info[DT_BIND_NOW])
761 if (tpnt->dynamic_info[DT_JMPREL] &&
762 (!(tpnt->init_flag & JMP_RELOCS_DONE) ||
763 (now_flag && !(tpnt->rtld_flags & now_flag)))) {
764 tpnt->rtld_flags |= now_flag;
765 tpnt->init_flag |= JMP_RELOCS_DONE;
766 if (!(tpnt->rtld_flags & RTLD_NOW)) {
767 _dl_parse_lazy_relocation_information(rpnt,
768 tpnt->dynamic_info[DT_JMPREL],
769 tpnt->dynamic_info [DT_PLTRELSZ]);
771 goof += _dl_parse_relocation_information(rpnt,
772 tpnt->dynamic_info[DT_JMPREL],
773 tpnt->dynamic_info[DT_PLTRELSZ]);
779 /* Minimal printf which handles only %s, %d, and %x */
780 void _dl_dprintf(int fd, const char *fmt, ...)
784 char *start, *ptr, *string;
787 buf = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
788 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
789 if (_dl_mmap_check_error(buf)) {
790 _dl_write(fd, "mmap of a spare page failed!\n", 29);
799 if (_dl_strlen(fmt) >= (_dl_pagesize - 1)) {
800 _dl_write(fd, "overflow\n", 11);
804 _dl_strcpy(buf, fmt);
808 while (*ptr != '%' && *ptr) {
814 _dl_write(fd, start, _dl_strlen(start));
818 string = va_arg(args, char *);
821 _dl_write(fd, "(null)", 6);
823 _dl_write(fd, string, _dl_strlen(string));
830 num = va_arg(args, long);
832 string = _dl_simple_ltoa(tmp, num);
833 _dl_write(fd, string, _dl_strlen(string));
840 num = va_arg(args, long);
842 string = _dl_simple_ltoahex(tmp, num);
843 _dl_write(fd, string, _dl_strlen(string));
847 _dl_write(fd, "(null)", 6);
853 _dl_write(fd, start, _dl_strlen(start));
857 _dl_munmap(buf, _dl_pagesize);
861 char *_dl_strdup(const char *string)
866 len = _dl_strlen(string);
867 retval = _dl_malloc(len + 1);
868 _dl_strcpy(retval, string);
872 void _dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void *debug_addr, ElfW(Addr) load_off)
874 __dl_parse_dynamic_info(dpnt, dynamic_info, debug_addr, load_off);
877 #if ! defined LIBDL || (! defined PIC && ! defined __PIC__)
879 __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, size_t size, void *data), void *data)
881 struct elf_resolve *l;
882 struct dl_phdr_info info;
885 for (l = _dl_loaded_modules; l != NULL; l = l->next) {
886 info.dlpi_addr = l->loadaddr;
887 info.dlpi_name = l->libname;
888 info.dlpi_phdr = l->ppnt;
889 info.dlpi_phnum = l->n_phent;
890 ret = callback (&info, sizeof (struct dl_phdr_info), data);
896 strong_alias(__dl_iterate_phdr, dl_iterate_phdr);