mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 20:21:07 +00:00
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/* Return backtrace of current program state.
|
|
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
|
|
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <bits/libc-lock.h>
|
|
#include <dlfcn.h>
|
|
#include <execinfo.h>
|
|
#include <stdlib.h>
|
|
#include <unwind.h>
|
|
|
|
struct trace_arg
|
|
{
|
|
void **array;
|
|
int cnt, size;
|
|
};
|
|
|
|
#ifdef SHARED
|
|
static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *);
|
|
static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *);
|
|
|
|
static void
|
|
init (void)
|
|
{
|
|
void *handle = __libc_dlopen ("libgcc_s.so.1");
|
|
|
|
if (handle == NULL)
|
|
return;
|
|
|
|
unwind_backtrace = __libc_dlsym (handle, "_Unwind_Backtrace");
|
|
unwind_getip = __libc_dlsym (handle, "_Unwind_GetIP");
|
|
if (unwind_getip == NULL)
|
|
unwind_backtrace = NULL;
|
|
}
|
|
#else
|
|
# define unwind_backtrace _Unwind_Backtrace
|
|
# define unwind_getip _Unwind_GetIP
|
|
#endif
|
|
|
|
static _Unwind_Reason_Code
|
|
backtrace_helper (struct _Unwind_Context *ctx, void *a)
|
|
{
|
|
struct trace_arg *arg = a;
|
|
|
|
/* We are first called with address in the __backtrace function.
|
|
Skip it. */
|
|
if (arg->cnt != -1)
|
|
arg->array[arg->cnt] = (void *) unwind_getip (ctx);
|
|
if (++arg->cnt == arg->size)
|
|
return _URC_END_OF_STACK;
|
|
return _URC_NO_REASON;
|
|
}
|
|
|
|
int
|
|
__backtrace (array, size)
|
|
void **array;
|
|
int size;
|
|
{
|
|
struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
|
|
#ifdef SHARED
|
|
__libc_once_define (static, once);
|
|
|
|
__libc_once (once, init);
|
|
if (unwind_backtrace == NULL)
|
|
return 0;
|
|
#endif
|
|
|
|
if (size >= 1)
|
|
unwind_backtrace (backtrace_helper, &arg);
|
|
|
|
/* _Unwind_Backtrace on IA-64 seems to put NULL address above
|
|
_start. Fix it up here. */
|
|
if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
|
|
--arg.cnt;
|
|
return arg.cnt != -1 ? arg.cnt : 0;
|
|
}
|
|
weak_alias (__backtrace, backtrace)
|