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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* DWARF2 EH unwinding support for OpenRISC.
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Copyright (C) 2011, 2012
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC 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
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef inhibit_libc
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#include <signal.h>
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#include <sys/ucontext.h>
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#include <linux/unistd.h>
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#define MD_FALLBACK_FRAME_STATE_FOR or1k_fallback_frame_state
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static _Unwind_Reason_Code
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or1k_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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struct rt_sigframe {
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siginfo_t info;
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struct ucontext uc;
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} *frame = context->cfa;
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struct sigcontext *sc;
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unsigned char *pc = context->ra;
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long new_cfa;
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int i;
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/*
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* Note: These have to be the same as in the kernel.
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* Please see arch/openrisc/kernel/signal.c
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*/
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if (!(*(unsigned short *)(pc + 0) == 0xa960
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&& *(unsigned short *)(pc + 2) == __NR_rt_sigreturn
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&& *(unsigned long *)(pc + 4) == 0x20000001
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&& *(unsigned long *)(pc + 8) == 0x15000000))
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return _URC_END_OF_STACK;
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sc = (struct sigcontext *) &frame->uc.uc_mcontext;
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new_cfa = sc->regs.gpr[1];
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = STACK_POINTER_REGNUM;
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fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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for (i = 0; i < 32; ++i)
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{
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fs->regs.reg[i].how = REG_SAVED_OFFSET;
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fs->regs.reg[i].loc.offset = (long)&sc->regs.gpr[i] - new_cfa;
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}
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fs->retaddr_column = 9;
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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#endif /* ifdef inhibit_libc */
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