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a2b08ee5 | 1 | /* Locate the shared object symbol nearest a given address. |
f420344c | 2 | Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. |
a2b08ee5 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
a2b08ee5 | 20 | #include <dlfcn.h> |
a853022c UD |
21 | #include <stddef.h> |
22 | #include <elf/ldsodefs.h> | |
a2b08ee5 UD |
23 | |
24 | ||
25 | int | |
d0fc4041 | 26 | internal_function |
a2b08ee5 UD |
27 | _dl_addr (const void *address, Dl_info *info) |
28 | { | |
29 | const ElfW(Addr) addr = (ElfW(Addr)) address; | |
30 | struct link_map *l, *match; | |
31 | const ElfW(Sym) *symtab, *matchsym; | |
32 | const char *strtab; | |
33 | ||
34 | /* Find the highest-addressed object that ADDRESS is not below. */ | |
35 | match = NULL; | |
36 | for (l = _dl_loaded; l; l = l->l_next) | |
a8a1269d UD |
37 | if (l->l_addr != 0 /* Make sure we do not currently set this map up |
38 | in this moment. */ | |
39 | && addr >= l->l_addr && (!match || match->l_addr < l->l_addr)) | |
a2b08ee5 UD |
40 | match = l; |
41 | ||
42 | if (match) | |
43 | { | |
44 | /* We know ADDRESS lies within MATCH if in any shared object. | |
45 | Make sure it isn't past the end of MATCH's segments. */ | |
46 | size_t n = match->l_phnum; | |
f024c196 UD |
47 | if (n > 0) |
48 | { | |
49 | do | |
50 | --n; | |
51 | while (match->l_phdr[n].p_type != PT_LOAD); | |
52 | if (addr >= (match->l_addr + | |
53 | match->l_phdr[n].p_vaddr + match->l_phdr[n].p_memsz)) | |
54 | /* Off the end of the highest-addressed shared object. */ | |
55 | return 0; | |
56 | } | |
a2b08ee5 UD |
57 | } |
58 | else | |
59 | return 0; | |
60 | ||
61 | /* Now we know what object the address lies in. */ | |
62 | info->dli_fname = match->l_name; | |
63 | info->dli_fbase = (void *) match->l_addr; | |
64 | ||
f420344c UD |
65 | symtab = (const void *) match->l_info[DT_SYMTAB]->d_un.d_ptr; |
66 | strtab = (const void *) match->l_info[DT_STRTAB]->d_un.d_ptr; | |
a2b08ee5 UD |
67 | |
68 | /* We assume that the string table follows the symbol table, because | |
69 | there is no way in ELF to know the size of the dynamic symbol table!! */ | |
70 | for (matchsym = NULL; (void *) symtab < (void *) strtab; ++symtab) | |
af6f3906 UD |
71 | if (addr >= match->l_addr + symtab->st_value |
72 | && (!matchsym | |
73 | || (matchsym->st_value < symtab->st_value | |
74 | && (ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL | |
75 | || ELFW(ST_BIND) (symtab->st_info) == STB_WEAK)))) | |
a2b08ee5 UD |
76 | matchsym = symtab; |
77 | ||
78 | if (matchsym) | |
79 | { | |
80 | /* We found a symbol close by. Fill in its name and exact address. */ | |
81 | info->dli_sname = strtab + matchsym->st_name; | |
82 | info->dli_saddr = (void *) (match->l_addr + matchsym->st_value); | |
83 | } | |
84 | else | |
85 | { | |
86 | /* No symbol matches. We return only the containing object. */ | |
87 | info->dli_sname = NULL; | |
88 | info->dli_saddr = NULL; | |
89 | } | |
90 | ||
91 | return 1; | |
92 | } |