mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/* Return backtrace of current program state.
|
|
Copyright (C) 2013-2023 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#include <execinfo.h>
|
|
#include <stddef.h>
|
|
#include <sysdep.h>
|
|
#include <sys/trap.h>
|
|
#include <backtrace.h>
|
|
#include <unwind-link.h>
|
|
|
|
struct layout
|
|
{
|
|
unsigned long locals[8];
|
|
unsigned long ins[6];
|
|
unsigned long next;
|
|
void *return_address;
|
|
};
|
|
|
|
struct trace_arg
|
|
{
|
|
void **array;
|
|
struct unwind_link *unwind_link;
|
|
_Unwind_Word cfa;
|
|
int cnt;
|
|
int size;
|
|
};
|
|
|
|
static _Unwind_Reason_Code
|
|
backtrace_helper (struct _Unwind_Context *ctx, void *a)
|
|
{
|
|
struct trace_arg *arg = a;
|
|
_Unwind_Ptr ip;
|
|
|
|
/* We are first called with address in the __backtrace function.
|
|
Skip it. */
|
|
if (arg->cnt != -1)
|
|
{
|
|
ip = UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetIP) (ctx);
|
|
arg->array[arg->cnt] = (void *) ip;
|
|
|
|
/* Check whether we make any progress. */
|
|
_Unwind_Word cfa
|
|
= UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetCFA) (ctx);
|
|
|
|
if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]
|
|
&& cfa == arg->cfa)
|
|
return _URC_END_OF_STACK;
|
|
arg->cfa = cfa;
|
|
}
|
|
if (++arg->cnt == arg->size)
|
|
return _URC_END_OF_STACK;
|
|
return _URC_NO_REASON;
|
|
}
|
|
|
|
int
|
|
__backtrace (void **array, int size)
|
|
{
|
|
int count;
|
|
struct trace_arg arg =
|
|
{
|
|
.array = array,
|
|
.unwind_link = __libc_unwind_link_get (),
|
|
.size = size,
|
|
.cnt = -1,
|
|
};
|
|
|
|
if (size <= 0)
|
|
return 0;
|
|
|
|
if (arg.unwind_link == NULL)
|
|
{
|
|
struct layout *current;
|
|
unsigned long fp, i7;
|
|
|
|
asm volatile ("mov %%fp, %0" : "=r"(fp));
|
|
asm volatile ("mov %%i7, %0" : "=r"(i7));
|
|
current = (struct layout *) (fp + BACKTRACE_STACK_BIAS);
|
|
|
|
array[0] = (void *) i7;
|
|
|
|
if (size == 1)
|
|
return 1;
|
|
|
|
backtrace_flush_register_windows();
|
|
for (count = 1; count < size; count++)
|
|
{
|
|
array[count] = current->return_address;
|
|
if (!current->next)
|
|
break;
|
|
current = (struct layout *) (current->next + BACKTRACE_STACK_BIAS);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
UNWIND_LINK_PTR (arg.unwind_link, _Unwind_Backtrace)
|
|
(backtrace_helper, &arg);
|
|
|
|
/* _Unwind_Backtrace seems to put NULL address above
|
|
_start. Fix it up here. */
|
|
if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
|
|
--arg.cnt;
|
|
count = arg.cnt != -1 ? arg.cnt : 0;
|
|
}
|
|
return count;
|
|
}
|
|
weak_alias (__backtrace, backtrace)
|
|
libc_hidden_def (__backtrace)
|