88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* DWARF2 EH unwinding support for OpenRISC Linux.
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Copyright (C) 2018-2020 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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/* Do code reading to identify a signal frame, and set the frame
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state data appropriately. See unwind-dw2.c for the structs. */
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#include <signal.h>
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#include <sys/ucontext.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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unsigned int *pc = context->ra;
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struct rt_sigframe {
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siginfo_t info;
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ucontext_t uc;
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} *rt;
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struct sigcontext *sc;
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long new_cfa;
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int i;
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if (pc[0] != 0xa960008b /* l.ori r11, r0, NR_rt_sigreturn */
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|| pc[1] != 0x20000001) /* l.sys 1 */
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return _URC_END_OF_STACK;
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if (context->cfa == 0)
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return _URC_END_OF_STACK;
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rt = context->cfa;
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sc = &rt->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 = 1;
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fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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for (i = 2; 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->regs.reg[32].how = REG_SAVED_OFFSET;
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fs->regs.reg[32].loc.offset = (long)&sc->regs.pc - new_cfa;
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fs->retaddr_column = 32;
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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#define MD_FROB_UPDATE_CONTEXT or1k_frob_update_context
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/* Fix up for signal handlers that don't have S flag set. */
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static void
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or1k_frob_update_context (struct _Unwind_Context *context,
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_Unwind_FrameState *fs ATTRIBUTE_UNUSED)
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{
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unsigned int *pc = context->ra;
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if (pc[0] == 0xa960008b /* l.ori r11, r0, NR_rt_sigreturn */
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&& pc[1] == 0x20000001) /* l.sys 1 */
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_Unwind_SetSignalFrame (context, 1);
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}
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#endif
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