2 * Copyright (c) 1998 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/kern/link_elf.c,v 1.24 1999/12/24 15:33:36 bde Exp $
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/malloc.h>
34 #include <sys/namei.h>
35 #include <sys/fcntl.h>
36 #include <sys/vnode.h>
37 #include <sys/linker.h>
38 #include <machine/elf.h>
41 #include <vm/vm_param.h>
42 #include <vm/vm_zone.h>
45 #include <vm/vm_object.h>
46 #include <vm/vm_kern.h>
47 #include <vm/vm_extern.h>
50 #include <vm/vm_map.h>
52 static int link_elf_load_module(const char*, linker_file_t*);
53 static int link_elf_load_file(const char*, linker_file_t*);
54 static int link_elf_lookup_symbol(linker_file_t, const char*,
56 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t, linker_symval_t*);
57 static int link_elf_search_symbol(linker_file_t, caddr_t value,
58 c_linker_sym_t* sym, long* diffp);
60 static void link_elf_unload_file(linker_file_t);
61 static void link_elf_unload_module(linker_file_t);
63 static struct linker_class_ops link_elf_class_ops = {
67 static struct linker_file_ops link_elf_file_ops = {
68 link_elf_lookup_symbol,
69 link_elf_symbol_values,
70 link_elf_search_symbol,
74 static struct linker_file_ops link_elf_module_ops = {
75 link_elf_lookup_symbol,
76 link_elf_symbol_values,
77 link_elf_search_symbol,
78 link_elf_unload_module,
80 typedef struct elf_file {
81 caddr_t address; /* Relocation address */
83 vm_object_t object; /* VM object to hold file pages */
85 const Elf_Dyn* dynamic; /* Symbol table etc. */
86 Elf_Off nbuckets; /* DT_HASH info */
88 const Elf_Off* buckets;
89 const Elf_Off* chains;
91 caddr_t strtab; /* DT_STRTAB */
92 int strsz; /* DT_STRSZ */
93 const Elf_Sym* symtab; /* DT_SYMTAB */
94 Elf_Addr* got; /* DT_PLTGOT */
95 const Elf_Rel* pltrel; /* DT_JMPREL */
96 int pltrelsize; /* DT_PLTRELSZ */
97 const Elf_Rela* pltrela; /* DT_JMPREL */
98 int pltrelasize; /* DT_PLTRELSZ */
99 const Elf_Rel* rel; /* DT_REL */
100 int relsize; /* DT_RELSZ */
101 const Elf_Rela* rela; /* DT_RELA */
102 int relasize; /* DT_RELASZ */
104 const Elf_Sym* ddbsymtab; /* The symbol table we are using */
105 long ddbsymcnt; /* Number of symbols */
106 caddr_t ddbstrtab; /* String table */
107 long ddbstrcnt; /* number of bytes in string table */
108 caddr_t symbase; /* malloc'ed symbold base */
109 caddr_t strbase; /* malloc'ed string base */
112 static int parse_dynamic(linker_file_t lf);
113 static int load_dependancies(linker_file_t lf);
114 static int relocate_file(linker_file_t lf);
115 static int parse_module_symbols(linker_file_t lf);
118 * The kernel symbol table starts here.
120 extern struct _dynamic _DYNAMIC;
123 link_elf_init(void* arg)
127 caddr_t modptr, baseptr, sizeptr;
132 #if ELF_TARG_CLASS == ELFCLASS32
133 linker_add_class("elf32", NULL, &link_elf_class_ops);
135 linker_add_class("elf64", NULL, &link_elf_class_ops);
139 dp = (Elf_Dyn*) &_DYNAMIC;
141 ef = malloc(sizeof(struct elf_file), M_LINKER, M_NOWAIT);
143 panic("link_elf_init: Can't create linker structures for kernel");
144 bzero(ef, sizeof(*ef));
147 #ifdef SPARSE_MAPPING
152 modptr = preload_search_by_type("elf kernel");
154 modname = (char *)preload_search_info(modptr, MODINFO_NAME);
157 linker_kernel_file = linker_make_file(modname, ef, &link_elf_file_ops);
158 if (linker_kernel_file == NULL)
159 panic("link_elf_init: Can't create linker structures for kernel");
160 parse_dynamic(linker_kernel_file);
161 linker_kernel_file->address = (caddr_t) KERNBASE;
162 linker_kernel_file->size = -(intptr_t)linker_kernel_file->address;
166 baseptr = preload_search_info(modptr, MODINFO_ADDR);
168 linker_kernel_file->address = *(caddr_t *)baseptr;
169 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
171 linker_kernel_file->size = *(size_t *)sizeptr;
173 (void)parse_module_symbols(linker_kernel_file);
174 linker_current_file = linker_kernel_file;
175 linker_kernel_file->flags |= LINKER_FILE_LINKED;
180 SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, 0);
183 parse_module_symbols(linker_file_t lf)
185 elf_file_t ef = lf->priv;
187 caddr_t ssym, esym, base;
193 if (ef->modptr == NULL)
195 pointer = preload_search_info(ef->modptr, MODINFO_METADATA|MODINFOMD_SSYM);
198 ssym = *(caddr_t *)pointer;
199 pointer = preload_search_info(ef->modptr, MODINFO_METADATA|MODINFOMD_ESYM);
202 esym = *(caddr_t *)pointer;
206 symcnt = *(long *)base;
207 base += sizeof(long);
208 symtab = (Elf_Sym *)base;
209 base += roundup(symcnt, sizeof(long));
211 if (base > esym || base < ssym) {
212 printf("Symbols are corrupt!\n");
216 strcnt = *(long *)base;
217 base += sizeof(long);
219 base += roundup(strcnt, sizeof(long));
221 if (base > esym || base < ssym) {
222 printf("Symbols are corrupt!\n");
226 ef->ddbsymtab = symtab;
227 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
228 ef->ddbstrtab = strtab;
229 ef->ddbstrcnt = strcnt;
235 parse_dynamic(linker_file_t lf)
237 elf_file_t ef = lf->priv;
239 int plttype = DT_REL;
241 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) {
245 /* From src/libexec/rtld-elf/rtld.c */
246 const Elf_Off *hashtab = (const Elf_Off *)
247 (ef->address + dp->d_un.d_ptr);
248 ef->nbuckets = hashtab[0];
249 ef->nchains = hashtab[1];
250 ef->buckets = hashtab + 2;
251 ef->chains = ef->buckets + ef->nbuckets;
255 ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr);
258 ef->strsz = dp->d_un.d_val;
261 ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr);
264 if (dp->d_un.d_val != sizeof(Elf_Sym))
268 ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr);
271 ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
274 ef->relsize = dp->d_un.d_val;
277 if (dp->d_un.d_val != sizeof(Elf_Rel))
281 ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
284 ef->pltrelsize = dp->d_un.d_val;
287 ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr);
290 ef->relasize = dp->d_un.d_val;
293 if (dp->d_un.d_val != sizeof(Elf_Rela))
297 plttype = dp->d_un.d_val;
298 if (plttype != DT_REL && plttype != DT_RELA)
304 if (plttype == DT_RELA) {
305 ef->pltrela = (const Elf_Rela *) ef->pltrel;
307 ef->pltrelasize = ef->pltrelsize;
311 ef->ddbsymtab = ef->symtab;
312 ef->ddbsymcnt = ef->nchains;
313 ef->ddbstrtab = ef->strtab;
314 ef->ddbstrcnt = ef->strsz;
320 link_elf_error(const char *s)
322 printf("kldload: %s\n", s);
326 link_elf_load_module(const char *filename, linker_file_t *result)
328 caddr_t modptr, baseptr, sizeptr, dynptr;
335 /* Look to see if we have the module preloaded */
336 modptr = preload_search_by_name(filename);
338 return (link_elf_load_file(filename, result));
340 /* It's preloaded, check we can handle it and collect information */
341 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
342 baseptr = preload_search_info(modptr, MODINFO_ADDR);
343 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
344 dynptr = preload_search_info(modptr, MODINFO_METADATA|MODINFOMD_DYNAMIC);
345 if (type == NULL || strcmp(type, "elf module") != 0)
347 if (baseptr == NULL || sizeptr == NULL || dynptr == NULL)
350 ef = malloc(sizeof(struct elf_file), M_LINKER, M_WAITOK);
353 bzero(ef, sizeof(*ef));
355 ef->address = *(caddr_t *)baseptr;
356 #ifdef SPARSE_MAPPING
359 dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr;
360 ef->dynamic = (Elf_Dyn *)dp;
361 lf = linker_make_file(filename, ef, &link_elf_module_ops);
366 lf->address = ef->address;
367 lf->size = *(size_t *)sizeptr;
369 error = parse_dynamic(lf);
371 linker_file_unload(lf);
374 error = load_dependancies(lf);
376 linker_file_unload(lf);
379 error = relocate_file(lf);
381 linker_file_unload(lf);
384 (void)parse_module_symbols(lf);
385 lf->flags |= LINKER_FILE_LINKED;
391 link_elf_load_file(const char* filename, linker_file_t* result)
394 struct proc* p = curproc; /* XXX */
408 Elf_Addr base_vlimit;
423 pathname = linker_search_path(filename);
424 if (pathname == NULL)
427 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, pathname, p);
428 error = vn_open(&nd, FREAD, 0);
429 free(pathname, M_LINKER);
432 NDFREE(&nd, NDF_ONLY_PNBUF);
435 * Read the elf header from the file.
437 firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK);
438 if (firstpage == NULL) {
442 hdr = (Elf_Ehdr *)firstpage;
443 error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0,
444 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p);
445 nbytes = PAGE_SIZE - resid;
454 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
455 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
456 link_elf_error("Unsupported file layout");
460 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
461 || hdr->e_version != EV_CURRENT) {
462 link_elf_error("Unsupported file version");
466 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) {
467 link_elf_error("Unsupported file type");
471 if (hdr->e_machine != ELF_TARG_MACH) {
472 link_elf_error("Unsupported machine");
478 * We rely on the program header being in the first page. This is
479 * not strictly required by the ABI specification, but it seems to
480 * always true in practice. And, it simplifies things considerably.
482 if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) &&
483 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) &&
484 (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes)))
485 link_elf_error("Unreadable program headers");
488 * Scan the program header entries, and save key information.
490 * We rely on there being exactly two load segments, text and data,
493 phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff);
494 phlimit = phdr + hdr->e_phnum;
498 while (phdr < phlimit) {
499 switch (phdr->p_type) {
503 link_elf_error("Too many sections");
523 link_elf_error("Object is not dynamically-linked");
529 * Allocate the entire address space of the object, to stake out our
530 * contiguous region, and to establish the base address for relocation.
532 base_offset = trunc_page(segs[0]->p_offset);
533 base_vaddr = trunc_page(segs[0]->p_vaddr);
534 base_vlimit = round_page(segs[1]->p_vaddr + segs[1]->p_memsz);
535 mapsize = base_vlimit - base_vaddr;
537 ef = malloc(sizeof(struct elf_file), M_LINKER, M_WAITOK);
538 bzero(ef, sizeof(*ef));
539 #ifdef SPARSE_MAPPING
540 ef->object = vm_object_allocate(OBJT_DEFAULT, mapsize >> PAGE_SHIFT);
541 if (ef->object == NULL) {
546 vm_object_reference(ef->object);
547 ef->address = (caddr_t) vm_map_min(kernel_map);
548 error = vm_map_find(kernel_map, ef->object, 0,
549 (vm_offset_t *) &ef->address,
551 VM_PROT_ALL, VM_PROT_ALL, 0);
553 vm_object_deallocate(ef->object);
558 ef->address = malloc(mapsize, M_LINKER, M_WAITOK);
560 mapbase = ef->address;
563 * Read the text and data sections and zero the bss.
565 for (i = 0; i < 2; i++) {
566 caddr_t segbase = mapbase + segs[i]->p_vaddr - base_vaddr;
567 error = vn_rdwr(UIO_READ, nd.ni_vp,
568 segbase, segs[i]->p_filesz, segs[i]->p_offset,
569 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p);
571 #ifdef SPARSE_MAPPING
572 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
573 (vm_offset_t) ef->address
574 + (ef->object->size << PAGE_SHIFT));
575 vm_object_deallocate(ef->object);
577 free(ef->address, M_LINKER);
582 bzero(segbase + segs[i]->p_filesz,
583 segs[i]->p_memsz - segs[i]->p_filesz);
585 #ifdef SPARSE_MAPPING
587 * Wire down the pages
589 vm_map_pageable(kernel_map,
590 (vm_offset_t) segbase,
591 (vm_offset_t) segbase + segs[i]->p_memsz,
596 ef->dynamic = (const Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr);
598 lf = linker_make_file(filename, ef, &link_elf_file_ops);
600 #ifdef SPARSE_MAPPING
601 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
602 (vm_offset_t) ef->address
603 + (ef->object->size << PAGE_SHIFT));
604 vm_object_deallocate(ef->object);
606 free(ef->address, M_LINKER);
612 lf->address = ef->address;
615 error = parse_dynamic(lf);
618 error = load_dependancies(lf);
621 error = relocate_file(lf);
625 /* Try and load the symbol table if it's present. (you can strip it!) */
626 nbytes = hdr->e_shnum * hdr->e_shentsize;
627 if (nbytes == 0 || hdr->e_shoff == 0)
629 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
635 error = vn_rdwr(UIO_READ, nd.ni_vp,
636 (caddr_t)shdr, nbytes, hdr->e_shoff,
637 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p);
642 for (i = 0; i < hdr->e_shnum; i++) {
643 if (shdr[i].sh_type == SHT_SYMTAB) {
645 symstrindex = shdr[i].sh_link;
648 if (symtabindex < 0 || symstrindex < 0)
651 symcnt = shdr[symtabindex].sh_size;
652 ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK);
653 strcnt = shdr[symstrindex].sh_size;
654 ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK);
656 if (ef->symbase == NULL || ef->strbase == NULL) {
660 error = vn_rdwr(UIO_READ, nd.ni_vp,
661 ef->symbase, symcnt, shdr[symtabindex].sh_offset,
662 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p);
665 error = vn_rdwr(UIO_READ, nd.ni_vp,
666 ef->strbase, strcnt, shdr[symstrindex].sh_offset,
667 UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p);
671 ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
672 ef->ddbsymtab = (const Elf_Sym *)ef->symbase;
673 ef->ddbstrcnt = strcnt;
674 ef->ddbstrtab = ef->strbase;
676 lf->flags |= LINKER_FILE_LINKED;
684 linker_file_unload(lf);
686 free(shdr, M_LINKER);
688 free(firstpage, M_LINKER);
689 VOP_UNLOCK(nd.ni_vp, 0, p);
690 vn_close(nd.ni_vp, FREAD, p->p_ucred, p);
696 link_elf_unload_file(linker_file_t file)
698 elf_file_t ef = file->priv;
701 #ifdef SPARSE_MAPPING
703 vm_map_remove(kernel_map, (vm_offset_t) ef->address,
704 (vm_offset_t) ef->address
705 + (ef->object->size << PAGE_SHIFT));
706 vm_object_deallocate(ef->object);
710 free(ef->address, M_LINKER);
713 free(ef->symbase, M_LINKER);
715 free(ef->strbase, M_LINKER);
721 link_elf_unload_module(linker_file_t file)
723 elf_file_t ef = file->priv;
728 preload_delete_name(file->filename);
732 load_dependancies(linker_file_t lf)
734 elf_file_t ef = lf->priv;
741 * All files are dependant on /kernel.
743 if (linker_kernel_file) {
744 linker_kernel_file->refs++;
745 linker_file_add_dependancy(lf, linker_kernel_file);
748 for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) {
749 if (dp->d_tag == DT_NEEDED) {
750 name = ef->strtab + dp->d_un.d_val;
752 error = linker_load_file(name, &lfdep);
755 error = linker_file_add_dependancy(lf, lfdep);
766 symbol_name(elf_file_t ef, Elf_Word r_info)
770 if (ELF_R_SYM(r_info)) {
771 ref = ef->symtab + ELF_R_SYM(r_info);
772 return ef->strtab + ref->st_name;
778 relocate_file(linker_file_t lf)
780 elf_file_t ef = lf->priv;
781 const Elf_Rel *rellim;
783 const Elf_Rela *relalim;
784 const Elf_Rela *rela;
787 /* Perform relocations without addend if there are any: */
790 rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize);
791 while (rel < rellim) {
792 symname = symbol_name(ef, rel->r_info);
793 if (elf_reloc(lf, rel, ELF_RELOC_REL, symname)) {
794 printf("link_elf: symbol %s undefined\n", symname);
801 /* Perform relocations with addend if there are any: */
804 relalim = (const Elf_Rela *)((const char *)ef->rela + ef->relasize);
805 while (rela < relalim) {
806 symname = symbol_name(ef, rela->r_info);
807 if (elf_reloc(lf, rela, ELF_RELOC_RELA, symname)) {
808 printf("link_elf: symbol %s undefined\n", symname);
815 /* Perform PLT relocations without addend if there are any: */
818 rellim = (const Elf_Rel *)((const char *)ef->pltrel + ef->pltrelsize);
819 while (rel < rellim) {
820 symname = symbol_name(ef, rel->r_info);
821 if (elf_reloc(lf, rel, ELF_RELOC_REL, symname)) {
822 printf("link_elf: symbol %s undefined\n", symname);
829 /* Perform relocations with addend if there are any: */
832 relalim = (const Elf_Rela *)((const char *)ef->pltrela + ef->pltrelasize);
833 while (rela < relalim) {
834 symname = symbol_name(ef, rela->r_info);
835 if (elf_reloc(lf, rela, ELF_RELOC_RELA, symname)) {
836 printf("link_elf: symbol %s undefined\n", symname);
847 * Hash function for symbol table lookup. Don't even think about changing
848 * this. It is specified by the System V ABI.
851 elf_hash(const char *name)
853 const unsigned char *p = (const unsigned char *) name;
859 if ((g = h & 0xf0000000) != 0)
867 link_elf_lookup_symbol(linker_file_t lf, const char* name, c_linker_sym_t* sym)
869 elf_file_t ef = lf->priv;
870 unsigned long symnum;
876 /* First, search hashed global symbols */
877 hash = elf_hash(name);
878 symnum = ef->buckets[hash % ef->nbuckets];
880 while (symnum != STN_UNDEF) {
881 if (symnum >= ef->nchains) {
882 printf("link_elf_lookup_symbol: corrupt symbol table\n");
886 symp = ef->symtab + symnum;
887 if (symp->st_name == 0) {
888 printf("link_elf_lookup_symbol: corrupt symbol table\n");
892 strp = ef->strtab + symp->st_name;
894 if (strcmp(name, strp) == 0) {
895 if (symp->st_shndx != SHN_UNDEF ||
896 (symp->st_value != 0 &&
897 ELF_ST_TYPE(symp->st_info) == STT_FUNC)) {
898 *sym = (c_linker_sym_t) symp;
904 symnum = ef->chains[symnum];
907 /* If we have not found it, look at the full table (if loaded) */
908 if (ef->symtab == ef->ddbsymtab)
911 /* Exhaustive search */
912 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
913 strp = ef->ddbstrtab + symp->st_name;
914 if (strcmp(name, strp) == 0) {
915 if (symp->st_shndx != SHN_UNDEF ||
916 (symp->st_value != 0 &&
917 ELF_ST_TYPE(symp->st_info) == STT_FUNC)) {
918 *sym = (c_linker_sym_t) symp;
929 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym, linker_symval_t* symval)
931 elf_file_t ef = lf->priv;
932 const Elf_Sym* es = (const Elf_Sym*) sym;
934 if (es >= ef->symtab && ((es - ef->symtab) < ef->nchains)) {
935 symval->name = ef->strtab + es->st_name;
936 symval->value = (caddr_t) ef->address + es->st_value;
937 symval->size = es->st_size;
940 if (ef->symtab == ef->ddbsymtab)
942 if (es >= ef->ddbsymtab && ((es - ef->ddbsymtab) < ef->ddbsymcnt)) {
943 symval->name = ef->ddbstrtab + es->st_name;
944 symval->value = (caddr_t) ef->address + es->st_value;
945 symval->size = es->st_size;
952 link_elf_search_symbol(linker_file_t lf, caddr_t value,
953 c_linker_sym_t* sym, long* diffp)
955 elf_file_t ef = lf->priv;
956 u_long off = (uintptr_t) (void *) value;
960 const Elf_Sym* best = 0;
963 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
964 if (es->st_name == 0)
966 st_value = es->st_value + (uintptr_t) (void *) ef->address;
967 if (off >= st_value) {
968 if (off - st_value < diff) {
969 diff = off - st_value;
973 } else if (off - st_value == diff) {
982 *sym = (c_linker_sym_t) best;