1 /* Write formatted list with names for addresses in backtrace to a file.
2 Copyright (C) 1998, 2000, 2003, 2005 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, see <http://www.gnu.org/licenses/>.
19
20 Based on glibc/sysdeps/generic/elf/backtracesymsfd.c
21
22 Copyright (C) 2010 STMicroelectronics Ltd
23 Author(s): Carmelo Amoroso <carmelo.amoroso@st.com>
24 * Modified to work with uClibc
25 - updated headers inclusion
26 - updated formatting and style
27 - updated to use dladdr from libdl
28 - updated to use snprintf instead of _itoa_word */
29
30 #include <execinfo.h>
31 #include <string.h>
32 #include <sys/uio.h>
33 #include <dlfcn.h>
34 #include <stdio.h>
35 #include <link.h> /* required for __ELF_NATIVE_CLASS */
36
37 #if __ELF_NATIVE_CLASS == 32
38 # define WORD_WIDTH 8
39 #else
40 /* We assyme 64bits. */
41 # define WORD_WIDTH 16
42 #endif
43
44 #define BUF_SIZE (WORD_WIDTH + 1)
45
backtrace_symbols_fd(void * const * array,int size,int fd)46 void backtrace_symbols_fd (void *const *array, int size, int fd)
47 {
48 struct iovec iov[9];
49 int cnt;
50
51 for (cnt = 0; cnt < size; ++cnt) {
52 char buf[BUF_SIZE];
53 Dl_info info;
54 size_t last = 0;
55 size_t len = 0;
56
57 memset(buf, 0, sizeof(buf));
58 if (dladdr (array[cnt], &info)
59 && info.dli_fname && info.dli_fname[0] != '\0') {
60 /* Name of the file. */
61 iov[0].iov_base = (void *) info.dli_fname;
62 iov[0].iov_len = strlen (info.dli_fname);
63 last = 1;
64
65 /* Symbol name. */
66 if (info.dli_sname != NULL) {
67 char buf2[BUF_SIZE];
68 memset(buf2, 0, sizeof(buf2));
69 size_t diff;
70
71 iov[1].iov_base = (void *) "(";
72 iov[1].iov_len = 1;
73 iov[2].iov_base = (void *) info.dli_sname;
74 iov[2].iov_len = strlen (info.dli_sname);
75
76 if (array[cnt] >= (void *) info.dli_saddr) {
77 iov[3].iov_base = (void *) "+0x";
78 diff = array[cnt] - info.dli_saddr;
79 } else {
80 iov[3].iov_base = (void *) "-0x";
81 diff = info.dli_saddr - array[cnt];
82 }
83
84 iov[3].iov_len = 3;
85
86 /* convert diff to a string in hex format */
87 len = snprintf(buf2, sizeof(buf2), "%lx", (unsigned long) diff);
88 iov[4].iov_base = buf2;
89 iov[4].iov_len = len;
90
91 iov[5].iov_base = (void *) ")";
92 iov[5].iov_len = 1;
93
94 last = 6;
95 }
96 }
97
98 iov[last].iov_base = (void *) "[0x";
99 iov[last].iov_len = 3;
100 ++last;
101
102 /* convert array[cnt] to a string in hex format */
103 len = snprintf(buf, sizeof(buf), "%lx", (unsigned long) array[cnt]);
104 iov[last].iov_base = buf;
105 iov[last].iov_len = len;
106
107 ++last;
108
109 iov[last].iov_base = (void *) "]\n";
110 iov[last].iov_len = 2;
111 ++last;
112
113 writev (fd, iov, last);
114 }
115 }
116