123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/* Return list with names for address in backtrace.
|
|
Copyright (C) 1998-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <assert.h>
|
|
#include <execinfo.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <ldsodefs.h>
|
|
|
|
#if __ELF_NATIVE_CLASS == 32
|
|
# define WORD_WIDTH 8
|
|
#else
|
|
/* We assume 64bits. */
|
|
# define WORD_WIDTH 16
|
|
#endif
|
|
|
|
|
|
char **
|
|
__backtrace_symbols (array, size)
|
|
void *const *array;
|
|
int size;
|
|
{
|
|
Dl_info info[size];
|
|
int status[size];
|
|
int cnt;
|
|
size_t total = 0;
|
|
char **result;
|
|
|
|
/* Fill in the information we can get from `dladdr'. */
|
|
for (cnt = 0; cnt < size; ++cnt)
|
|
{
|
|
struct link_map *map;
|
|
status[cnt] = _dl_addr (array[cnt], &info[cnt], &map, NULL);
|
|
if (status[cnt] && info[cnt].dli_fname && info[cnt].dli_fname[0] != '\0')
|
|
{
|
|
/* We have some info, compute the length of the string which will be
|
|
"<file-name>(<sym-name>+offset) [address]. */
|
|
total += (strlen (info[cnt].dli_fname ?: "")
|
|
+ strlen (info[cnt].dli_sname ?: "")
|
|
+ 3 + WORD_WIDTH + 3 + WORD_WIDTH + 5);
|
|
|
|
/* The load bias is more useful to the user than the load
|
|
address. The use of these addresses is to calculate an
|
|
address in the ELF file, so its prelinked bias is not
|
|
something we want to subtract out. */
|
|
info[cnt].dli_fbase = (void *) map->l_addr;
|
|
}
|
|
else
|
|
total += 5 + WORD_WIDTH;
|
|
}
|
|
|
|
/* Allocate memory for the result. */
|
|
result = (char **) malloc (size * sizeof (char *) + total);
|
|
if (result != NULL)
|
|
{
|
|
char *last = (char *) (result + size);
|
|
|
|
for (cnt = 0; cnt < size; ++cnt)
|
|
{
|
|
result[cnt] = last;
|
|
|
|
if (status[cnt]
|
|
&& info[cnt].dli_fname != NULL && info[cnt].dli_fname[0] != '\0')
|
|
{
|
|
if (info[cnt].dli_sname == NULL)
|
|
/* We found no symbol name to use, so describe it as
|
|
relative to the file. */
|
|
info[cnt].dli_saddr = info[cnt].dli_fbase;
|
|
|
|
if (info[cnt].dli_sname == NULL && info[cnt].dli_saddr == 0)
|
|
last += 1 + sprintf (last, "%s(%s) [%p]",
|
|
info[cnt].dli_fname ?: "",
|
|
info[cnt].dli_sname ?: "",
|
|
array[cnt]);
|
|
else
|
|
{
|
|
char sign;
|
|
ptrdiff_t offset;
|
|
if (array[cnt] >= (void *) info[cnt].dli_saddr)
|
|
{
|
|
sign = '+';
|
|
offset = array[cnt] - info[cnt].dli_saddr;
|
|
}
|
|
else
|
|
{
|
|
sign = '-';
|
|
offset = info[cnt].dli_saddr - array[cnt];
|
|
}
|
|
|
|
last += 1 + sprintf (last, "%s(%s%c%#tx) [%p]",
|
|
info[cnt].dli_fname ?: "",
|
|
info[cnt].dli_sname ?: "",
|
|
sign, offset, array[cnt]);
|
|
}
|
|
}
|
|
else
|
|
last += 1 + sprintf (last, "[%p]", array[cnt]);
|
|
}
|
|
assert (last <= (char *) result + size * sizeof (char *) + total);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
weak_alias (__backtrace_symbols, backtrace_symbols)
|