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b6ab06ce | 1 | /* Write formatted list with names for addresses in backtrace to a file. |
dff8da6b | 2 | Copyright (C) 1998-2024 Free Software Foundation, Inc. |
b6ab06ce | 3 | This file is part of the GNU C Library. |
b6ab06ce UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the 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 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
b6ab06ce UD |
18 | |
19 | #include <execinfo.h> | |
20 | #include <string.h> | |
21 | #include <sys/uio.h> | |
22 | ||
eb96ffb0 | 23 | #include <_itoa.h> |
1d6c3d23 | 24 | #include <ldsodefs.h> |
b6ab06ce UD |
25 | |
26 | #if __ELF_NATIVE_CLASS == 32 | |
27 | # define WORD_WIDTH 8 | |
28 | #else | |
29 | /* We assume 64bits. */ | |
30 | # define WORD_WIDTH 16 | |
31 | #endif | |
32 | ||
33 | ||
34 | void | |
9d46370c | 35 | __backtrace_symbols_fd (void *const *array, int size, int fd) |
b6ab06ce | 36 | { |
1d6c3d23 | 37 | struct iovec iov[9]; |
b6ab06ce UD |
38 | int cnt; |
39 | ||
40 | for (cnt = 0; cnt < size; ++cnt) | |
41 | { | |
42 | char buf[WORD_WIDTH]; | |
1d6c3d23 AJ |
43 | char buf2[WORD_WIDTH]; |
44 | Dl_info info; | |
45 | struct link_map *map; | |
46 | size_t last = 0; | |
b6ab06ce | 47 | |
1d6c3d23 AJ |
48 | if (_dl_addr (array[cnt], &info, &map, NULL) |
49 | && info.dli_fname != NULL && info.dli_fname[0] != '\0') | |
50 | { | |
51 | /* Name of the file. */ | |
52 | iov[0].iov_base = (void *) info.dli_fname; | |
53 | iov[0].iov_len = strlen (info.dli_fname); | |
54 | last = 1; | |
b6ab06ce | 55 | |
1d6c3d23 AJ |
56 | if (info.dli_sname != NULL || map->l_addr != 0) |
57 | { | |
58 | size_t diff; | |
b6ab06ce | 59 | |
1d6c3d23 AJ |
60 | iov[last].iov_base = (void *) "("; |
61 | iov[last].iov_len = 1; | |
62 | ++last; | |
b6ab06ce | 63 | |
1d6c3d23 AJ |
64 | if (info.dli_sname != NULL) |
65 | { | |
66 | /* We have a symbol name. */ | |
67 | iov[last].iov_base = (void *) info.dli_sname; | |
68 | iov[last].iov_len = strlen (info.dli_sname); | |
69 | ++last; | |
70 | } | |
71 | else | |
72 | /* We have no symbol, so describe it as relative to the file. | |
73 | The load bias is more useful to the user than the load | |
74 | address. The use of these addresses is to calculate an | |
75 | address in the ELF file, so its prelinked bias is not | |
76 | something we want to subtract out. */ | |
77 | info.dli_saddr = (void *) map->l_addr; | |
78 | ||
79 | if (array[cnt] >= (void *) info.dli_saddr) | |
80 | { | |
81 | iov[last].iov_base = (void *) "+0x"; | |
82 | diff = array[cnt] - info.dli_saddr; | |
83 | } | |
84 | else | |
85 | { | |
86 | iov[last].iov_base = (void *) "-0x"; | |
87 | diff = info.dli_saddr - array[cnt]; | |
88 | } | |
89 | iov[last].iov_len = 3; | |
90 | ++last; | |
91 | ||
92 | iov[last].iov_base = _itoa_word ((unsigned long int) diff, | |
93 | &buf2[WORD_WIDTH], 16, 0); | |
94 | iov[last].iov_len = (&buf2[WORD_WIDTH] | |
95 | - (char *) iov[last].iov_base); | |
96 | ++last; | |
97 | ||
98 | iov[last].iov_base = (void *) ")"; | |
99 | iov[last].iov_len = 1; | |
100 | ++last; | |
101 | } | |
102 | } | |
103 | ||
104 | iov[last].iov_base = (void *) "[0x"; | |
105 | iov[last].iov_len = 3; | |
106 | ++last; | |
107 | ||
108 | iov[last].iov_base = _itoa_word ((unsigned long int) array[cnt], | |
109 | &buf[WORD_WIDTH], 16, 0); | |
110 | iov[last].iov_len = &buf[WORD_WIDTH] - (char *) iov[last].iov_base; | |
111 | ++last; | |
112 | ||
113 | iov[last].iov_base = (void *) "]\n"; | |
114 | iov[last].iov_len = 2; | |
115 | ++last; | |
116 | ||
117 | __writev (fd, iov, last); | |
b6ab06ce UD |
118 | } |
119 | } | |
120 | weak_alias (__backtrace_symbols_fd, backtrace_symbols_fd) | |
121 | libc_hidden_def (__backtrace_symbols_fd) |