mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
60 lines
2.1 KiB
C
60 lines
2.1 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 <stddef.h>
|
|
#include <asm/sigcontext.h>
|
|
#include <linux/signal.h>
|
|
#include <asm-generic/ucontext.h>
|
|
#include <asm/unistd.h>
|
|
|
|
int
|
|
_identify_sighandler (unsigned long fp, unsigned long pc,
|
|
unsigned long *pprev_fp, unsigned long *pprev_pc,
|
|
unsigned long *retaddr)
|
|
{
|
|
unsigned long *tramp = 0;
|
|
struct ucontext *uc;
|
|
|
|
if (*retaddr == 0)
|
|
{
|
|
/* Kernel inserts the tramp between the signal handler frame and the
|
|
caller frame in signal handling. */
|
|
tramp = (unsigned long *) pc;
|
|
tramp += 2;
|
|
if ((*tramp == (0x31800000 | __NR_rt_sigreturn))
|
|
&& (*(tramp+1) == 0xb9cc0008))
|
|
{
|
|
/* Signal handler function argument are:
|
|
int sig_num, siginfo_t * info, void * ucontext
|
|
therefore ucontext is the 3rd argument. */
|
|
unsigned long ucptr = ((unsigned long) tramp
|
|
- sizeof (struct ucontext));
|
|
uc = (struct ucontext *) ucptr;
|
|
*pprev_pc = uc->uc_mcontext.regs.pc;
|
|
/* Need to record the return address since the return address of the
|
|
function which causes this signal may not be recorded in the
|
|
stack. */
|
|
*pprev_fp = uc->uc_mcontext.regs.r1;
|
|
*retaddr = uc->uc_mcontext.regs.r15;
|
|
/* It is a signal handler. */
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|