mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* Return backtrace of current program state.
|
|
Copyright (C) 2008-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <execinfo.h>
|
|
#include <stdlib.h>
|
|
#include <unwind-link.h>
|
|
|
|
struct trace_arg
|
|
{
|
|
void **array;
|
|
struct unwind_link *unwind_link;
|
|
int cnt, size;
|
|
};
|
|
|
|
#ifdef SHARED
|
|
/* This function is identical to "_Unwind_GetGR", except that it uses
|
|
"unwind_vrs_get" instead of "_Unwind_VRS_Get". */
|
|
static inline _Unwind_Word
|
|
unwind_getgr (struct unwind_link *unwind_link,
|
|
_Unwind_Context *context, int regno)
|
|
{
|
|
_uw val;
|
|
UNWIND_LINK_PTR (unwind_link, _Unwind_VRS_Get)
|
|
(context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
|
|
return val;
|
|
}
|
|
|
|
/* This macro is identical to the _Unwind_GetIP macro, except that it
|
|
uses "unwind_getgr" instead of "_Unwind_GetGR". */
|
|
#define unwind_getip(context) \
|
|
(unwind_getgr (arg->unwind_link, context, 15) & ~(_Unwind_Word)1)
|
|
|
|
#else /* !SHARED */
|
|
# 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 (void **array, int size)
|
|
{
|
|
struct trace_arg arg =
|
|
{
|
|
.array = array,
|
|
.unwind_link = __libc_unwind_link_get (),
|
|
.size = size,
|
|
.cnt = -1
|
|
};
|
|
|
|
if (size <= 0 || arg.unwind_link == NULL)
|
|
return 0;
|
|
|
|
UNWIND_LINK_PTR (arg.unwind_link, _Unwind_Backtrace)
|
|
(backtrace_helper, &arg);
|
|
|
|
if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
|
|
--arg.cnt;
|
|
return arg.cnt != -1 ? arg.cnt : 0;
|
|
}
|
|
weak_alias (__backtrace, backtrace)
|
|
libc_hidden_def (__backtrace)
|