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1 | /* Copyright (C) 2024 Red Hat, Inc. |
2 | This file is part of elfutils. | |
3 | ||
4 | This file is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 3 of the License, or | |
7 | (at your option) any later version. | |
8 | ||
9 | elfutils is distributed in the hope that it will be useful, but | |
10 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
16 | ||
17 | #ifdef HAVE_CONFIG_H | |
18 | # include <config.h> | |
19 | #endif | |
20 | ||
21 | #include <fcntl.h> | |
22 | #include <gelf.h> | |
23 | #include <stdio.h> | |
24 | #include <unistd.h> | |
25 | #include <assert.h> | |
26 | ||
27 | static void | |
28 | print_reloc_symnames (Elf *elf, Elf_Scn *scn, GElf_Shdr *shdr, size_t sh_entsize) | |
29 | { | |
30 | int nentries = shdr->sh_size / sh_entsize; | |
31 | ||
32 | /* Get the data of the section. */ | |
33 | Elf_Data *data = elf_getdata (scn, NULL); | |
34 | assert (data != NULL); | |
35 | ||
36 | /* Get the symbol table information. */ | |
37 | Elf_Scn *symscn = elf_getscn (elf, shdr->sh_link); | |
38 | GElf_Shdr symshdr_mem; | |
39 | GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem); | |
40 | Elf_Data *symdata = elf_getdata (symscn, NULL); | |
41 | assert (symshdr != NULL); | |
42 | assert (symdata != NULL); | |
43 | ||
44 | /* Search for the optional extended section index table. */ | |
45 | Elf_Data *xndxdata = NULL; | |
46 | int xndxscnidx = elf_scnshndx (scn); | |
47 | if (xndxscnidx) | |
48 | xndxdata = elf_getdata (elf_getscn (elf, xndxscnidx), NULL); | |
49 | ||
50 | /* Get the section header string table index. */ | |
51 | size_t shstrndx; | |
52 | assert (elf_getshdrstrndx (elf, &shstrndx) >= 0); | |
53 | ||
54 | printf("Section: %s\n", elf_strptr (elf, shstrndx, shdr->sh_name)); | |
55 | for (int cnt = 0; cnt < nentries; ++cnt) | |
56 | { | |
57 | GElf_Rel relmem; | |
58 | GElf_Rel *rel = gelf_getrel (data, cnt, &relmem); | |
59 | ||
60 | ||
61 | if (likely (rel != NULL)) | |
62 | { | |
63 | GElf_Sym symmem; | |
64 | Elf32_Word xndx; | |
65 | GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata, | |
66 | GELF_R_SYM (rel->r_info), | |
67 | &symmem, &xndx); | |
68 | ||
69 | if (sym == NULL) | |
70 | { | |
71 | printf ("<SYM NOT FOUND>\n"); | |
72 | continue; | |
73 | } | |
74 | ||
75 | if (GELF_ST_TYPE (sym->st_info) != STT_SECTION) | |
76 | printf ("%s\n", elf_strptr (elf, symshdr->sh_link, sym->st_name)); | |
77 | else | |
78 | { | |
79 | /* This is a relocation against a STT_SECTION symbol. */ | |
80 | GElf_Shdr secshdr_mem; | |
81 | GElf_Shdr *secshdr; | |
82 | secshdr = gelf_getshdr (elf_getscn (elf, | |
83 | sym->st_shndx == SHN_XINDEX | |
84 | ? xndx : sym->st_shndx), | |
85 | &secshdr_mem); | |
86 | ||
87 | if (secshdr == NULL) | |
88 | printf("<SECTION NOT FOUND>\n"); | |
89 | else | |
90 | printf ("%s\n", | |
91 | elf_strptr (elf, shstrndx, secshdr->sh_name)); | |
92 | } | |
93 | } | |
94 | } | |
95 | } | |
96 | ||
97 | int | |
98 | main (int argc, char *argv[]) | |
99 | { | |
100 | if (argc != 2) | |
101 | { | |
102 | printf ("Usage: elf_print_reloc_syms FILE\n"); | |
103 | return -1; | |
104 | } | |
105 | ||
106 | elf_version (EV_CURRENT); | |
107 | ||
108 | int fd = open(argv[1], O_RDONLY); | |
109 | assert (fd != -1); | |
110 | ||
111 | Elf *elf = elf_begin (fd, ELF_C_READ, NULL); | |
112 | assert (elf != NULL); | |
113 | ||
114 | size_t shnums; | |
115 | assert (elf_getshdrnum (elf, &shnums) >= 0); | |
116 | ||
117 | Elf_Scn *scn = NULL; | |
118 | while ((scn = elf_nextscn (elf, scn)) != NULL) | |
119 | { | |
120 | GElf_Shdr shdr_mem; | |
121 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); | |
122 | ||
123 | if (shdr != NULL) | |
124 | { | |
125 | /* Print the names of symbols referred to by relocations. */ | |
126 | if (shdr->sh_type == SHT_REL) | |
127 | { | |
128 | size_t sh_entsize = gelf_fsize (elf, ELF_T_REL, 1, EV_CURRENT); | |
129 | print_reloc_symnames (elf, scn, shdr, sh_entsize); | |
130 | } | |
131 | else if (shdr->sh_type == SHT_RELA) | |
132 | { | |
133 | size_t sh_entsize = gelf_fsize (elf, ELF_T_RELA, 1, EV_CURRENT); | |
134 | print_reloc_symnames (elf, scn, shdr, sh_entsize); | |
135 | } | |
136 | } | |
137 | } | |
138 | ||
139 | elf_end (elf); | |
140 | close (fd); | |
141 | return 0; | |
142 | } |