1 /* Return list with names for address in backtrace.
2 Copyright (C) 1998,1999,2000,2001,2003 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 Based on glibc/sysdeps/generic/elf/backtracesyms.c
23 Copyright (C) 2010 STMicroelectronics Ltd
24 Author(s): Carmelo Amoroso <carmelo.amoroso@st.com>
25 * Modified to work with uClibc
26 - updated headers inclusion
27 - updated formatting and style
28 - updated to use dladdr from libdl */
37 #include <link.h> /* required for __ELF_NATIVE_CLASS */
39 #if __ELF_NATIVE_CLASS == 32
42 /* We assyme 64bits. */
43 # define WORD_WIDTH 16
47 char ** backtrace_symbols (void *const *array, int size)
55 /* Fill in the information we can get from `dladdr'. */
56 for (cnt = 0; cnt < size; ++cnt) {
57 status[cnt] = dladdr (array[cnt], &info[cnt]);
58 if (status[cnt] && info[cnt].dli_fname &&
59 info[cnt].dli_fname[0] != '\0')
61 * We have some info, compute the length of the string which will be
62 * "<file-name>(<sym-name>) [+offset].
64 total += (strlen (info[cnt].dli_fname ?: "") +
65 (info[cnt].dli_sname ?
66 strlen (info[cnt].dli_sname) + 3 + WORD_WIDTH + 3 : 1)
69 total += 5 + WORD_WIDTH;
72 /* Allocate memory for the result. */
73 result = (char **) malloc (size * sizeof (char *) + total);
75 char *last = (char *) (result + size);
76 for (cnt = 0; cnt < size; ++cnt) {
79 if (status[cnt] && info[cnt].dli_fname
80 && info[cnt].dli_fname[0] != '\0') {
84 if (array[cnt] >= (void *) info[cnt].dli_saddr)
85 sprintf (buf, "+%#lx",
86 (unsigned long)(array[cnt] - info[cnt].dli_saddr));
88 sprintf (buf, "-%#lx",
89 (unsigned long)(info[cnt].dli_saddr - array[cnt]));
91 last += 1 + sprintf (last, "%s%s%s%s%s[%p]",
92 info[cnt].dli_fname ?: "",
93 info[cnt].dli_sname ? "(" : "",
94 info[cnt].dli_sname ?: "",
95 info[cnt].dli_sname ? buf : "",
96 info[cnt].dli_sname ? ") " : " ",
99 last += 1 + sprintf (last, "[%p]", array[cnt]);
101 assert (last <= (char *) result + size * sizeof (char *) + total);