mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 12:11:10 +00:00
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* Copyright (C) 2005-2016 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sysdep.h>
|
|
#include <signal.h>
|
|
#include <execinfo.h>
|
|
|
|
extern int
|
|
_identify_sighandler (unsigned long fp, unsigned long pc,
|
|
unsigned long *pprev_fp, unsigned long *pprev_pc,
|
|
unsigned long *retaddr);
|
|
|
|
inline long
|
|
get_frame_size (unsigned long instr)
|
|
{
|
|
return abs ((short signed) (instr & 0xFFFF));
|
|
}
|
|
|
|
static unsigned long *
|
|
find_frame_creation (unsigned long *pc)
|
|
{
|
|
int i;
|
|
|
|
/* NOTE: Distance to search is arbitrary.
|
|
250 works well for most things,
|
|
750 picks up things like tcp_recvmsg,
|
|
1000 needed for fat_fill_super. */
|
|
for (i = 0; i < 1000; i++, pc--)
|
|
{
|
|
unsigned long instr;
|
|
unsigned long frame_size;
|
|
|
|
instr = *pc;
|
|
|
|
/* Is the instruction of the form
|
|
addik r1, r1, foo ? */
|
|
if ((instr & 0xFFFF0000) != 0x30210000)
|
|
continue;
|
|
|
|
frame_size = get_frame_size (instr);
|
|
|
|
if ((frame_size < 8) || (frame_size & 3))
|
|
return NULL;
|
|
|
|
return pc;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
lookup_prev_stack_frame (unsigned long fp, unsigned long pc,
|
|
unsigned long *pprev_fp, unsigned long *pprev_pc,
|
|
unsigned long *retaddr)
|
|
{
|
|
unsigned long *prologue = NULL;
|
|
|
|
int is_signalhandler = _identify_sighandler (fp, pc, pprev_fp,
|
|
pprev_pc, retaddr);
|
|
|
|
if (!is_signalhandler)
|
|
{
|
|
prologue = find_frame_creation ((unsigned long *) pc);
|
|
|
|
if (prologue)
|
|
{
|
|
long frame_size = get_frame_size (*prologue);
|
|
*pprev_fp = fp + frame_size;
|
|
if (*retaddr != 0)
|
|
*pprev_pc = *retaddr;
|
|
else
|
|
*pprev_pc = *(unsigned long *) fp;
|
|
|
|
*retaddr = 0;
|
|
if (!*pprev_pc || (*pprev_pc & 3))
|
|
prologue=0;
|
|
}
|
|
else
|
|
{
|
|
*pprev_pc = 0;
|
|
*pprev_fp = fp;
|
|
*retaddr = 0;
|
|
}
|
|
}
|
|
return (!*pprev_pc || (*pprev_pc & 3)) ? -1 : 0;
|
|
}
|
|
|
|
int
|
|
__backtrace (void **array, int size)
|
|
{
|
|
unsigned long pc, fp;
|
|
unsigned long ppc, pfp;
|
|
/* Return address(r15) is required in the signal handler case, since the
|
|
return address of the function which causes the signal may not be
|
|
recorded in the stack. */
|
|
unsigned long retaddr;
|
|
|
|
int count;
|
|
int rc = 0;
|
|
|
|
if (size <= 0)
|
|
return 0;
|
|
|
|
__asm__ __volatile__ ("mfs %0, rpc"
|
|
: "=r"(pc));
|
|
|
|
__asm__ __volatile__ ("add %0, r1, r0"
|
|
: "=r"(fp));
|
|
|
|
array[0] = (void *) pc;
|
|
retaddr = 0;
|
|
for (count = 1; count < size; count++)
|
|
{
|
|
rc = lookup_prev_stack_frame (fp, pc, &pfp, &ppc, &retaddr);
|
|
|
|
fp = pfp;
|
|
pc = ppc;
|
|
array[count] = (void *) pc;
|
|
if (rc)
|
|
return count;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
weak_alias (__backtrace, backtrace)
|
|
libc_hidden_def (__backtrace)
|