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author | Andreas Jaeger <aj@suse.de> | 2012-03-19 21:04:21 +0100 |
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committer | Andreas Jaeger <aj@suse.de> | 2012-03-19 21:04:21 +0100 |
commit | c93ba106176a8b03a5c25f7d6fbb50524a9530cf (patch) | |
tree | 0c50c8452e4a3630d4935acab35e77b91b924124 /sysdeps/generic/backtracesyms.c | |
parent | 735095ae9566b2b14e8210e5ed44b3d5b51495f1 (diff) | |
download | glibc-c93ba106176a8b03a5c25f7d6fbb50524a9530cf.tar.gz glibc-c93ba106176a8b03a5c25f7d6fbb50524a9530cf.tar.xz glibc-c93ba106176a8b03a5c25f7d6fbb50524a9530cf.zip |
Move sysdeps/generic/elf/* to sysdeps/generic
Diffstat (limited to 'sysdeps/generic/backtracesyms.c')
-rw-r--r-- | sysdeps/generic/backtracesyms.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/sysdeps/generic/backtracesyms.c b/sysdeps/generic/backtracesyms.c new file mode 100644 index 0000000000..d75ce0a321 --- /dev/null +++ b/sysdeps/generic/backtracesyms.c @@ -0,0 +1,122 @@ +/* Return list with names for address in backtrace. + Copyright (C) 1998,1999,2000,2001,2003,2009 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 assyme 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) |