2016-01-04 16:05:18 +00:00
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/* Copyright (C) 2005-2016 Free Software Foundation, Inc.
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2012-01-10 05:38:42 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stddef.h>
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#include <asm/sigcontext.h>
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#include <linux/signal.h>
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#include <asm-generic/ucontext.h>
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#include <asm/unistd.h>
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int
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_identify_sighandler (unsigned long fp, unsigned long pc,
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unsigned long *pprev_fp, unsigned long *pprev_pc,
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unsigned long *retaddr)
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{
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unsigned long *tramp = 0;
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struct ucontext *uc;
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if (*retaddr == 0)
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{
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/* Kernel inserts the tramp between the signal handler frame and the
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caller frame in signal handling. */
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tramp = (unsigned long *) pc;
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tramp += 2;
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if ((*tramp == (0x31800000 | __NR_rt_sigreturn))
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&& (*(tramp+1) == 0xb9cc0008))
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{
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/* Signal handler function argument are:
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int sig_num, siginfo_t * info, void * ucontext
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therefore ucontext is the 3rd argument. */
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unsigned long ucptr = ((unsigned long) tramp
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- sizeof (struct ucontext));
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uc = (struct ucontext *) ucptr;
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*pprev_pc = uc->uc_mcontext.regs.pc;
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/* Need to record the return address since the return address of the
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function which causes this signal may not be recorded in the
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stack. */
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*pprev_fp = uc->uc_mcontext.regs.r1;
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*retaddr = uc->uc_mcontext.regs.r15;
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/* It is a signal handler. */
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return 1;
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}
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}
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return 0;
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}
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