157 lines
5.2 KiB
C
157 lines
5.2 KiB
C
/* DWARF2 EH unwinding support for SH Linux.
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Copyright (C) 2004-2020 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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/* 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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Don't use this at all if inhibit_libc is used. */
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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 "insn-constants.h"
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#define SH_DWARF_FRAME_GP0 0
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#define SH_DWARF_FRAME_FP0 25
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#define SH_DWARF_FRAME_XD0 87
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#define SH_DWARF_FRAME_PR 17
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#define SH_DWARF_FRAME_GBR 18
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#define SH_DWARF_FRAME_MACH 20
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#define SH_DWARF_FRAME_MACL 21
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#define SH_DWARF_FRAME_PC 16
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#define SH_DWARF_FRAME_SR 22
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#define SH_DWARF_FRAME_FPUL 23
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#define SH_DWARF_FRAME_FPSCR 24
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#define MD_FALLBACK_FRAME_STATE_FOR sh_fallback_frame_state
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static _Unwind_Reason_Code
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sh_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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unsigned char *pc = context->ra;
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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 defined (__SH3E__) || defined (__SH4__)
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int r;
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#endif
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/* mov.w 1f,r3; trapa #0x10; 1: .short 0x77 (sigreturn) */
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/* mov.w 1f,r3; trapa #0x10; 1: .short 0xad (rt_sigreturn) */
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/* Newer kernel uses pad instructions to avoid an SH-4 core bug. */
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/* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0;
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or r0,r0; 1: .short 0x77 (sigreturn) */
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/* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0;
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or r0,r0; 1: .short 0xad (rt_sigreturn) */
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if (((*(unsigned short *) (pc+0) == 0x9300)
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&& (*(unsigned short *) (pc+2) == 0xc310)
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&& (*(unsigned short *) (pc+4) == 0x0077))
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|| (((*(unsigned short *) (pc+0) == 0x9305)
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&& (*(unsigned short *) (pc+2) == 0xc310)
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&& (*(unsigned short *) (pc+14) == 0x0077))))
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sc = context->cfa;
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else if (((*(unsigned short *) (pc+0) == 0x9300)
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&& (*(unsigned short *) (pc+2) == 0xc310)
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&& (*(unsigned short *) (pc+4) == 0x00ad))
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|| (((*(unsigned short *) (pc+0) == 0x9305)
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&& (*(unsigned short *) (pc+2) == 0xc310)
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&& (*(unsigned short *) (pc+14) == 0x00ad))))
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{
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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_ = context->cfa;
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/* The void * cast is necessary to avoid an aliasing warning.
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The aliasing warning is correct, but should not be a problem
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because it does not alias anything. */
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sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext;
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}
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else
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return _URC_END_OF_STACK;
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new_cfa = sc->sc_regs[15];
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = 15;
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fs->regs.cfa_offset = new_cfa - (long) context->cfa;
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for (i = 0; i < 15; 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
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= (long)&(sc->sc_regs[i]) - new_cfa;
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}
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fs->regs.reg[SH_DWARF_FRAME_PR].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_PR].loc.offset
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= (long)&(sc->sc_pr) - new_cfa;
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fs->regs.reg[SH_DWARF_FRAME_SR].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_SR].loc.offset
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= (long)&(sc->sc_sr) - new_cfa;
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fs->regs.reg[SH_DWARF_FRAME_GBR].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_GBR].loc.offset
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= (long)&(sc->sc_gbr) - new_cfa;
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fs->regs.reg[SH_DWARF_FRAME_MACH].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_MACH].loc.offset
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= (long)&(sc->sc_mach) - new_cfa;
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fs->regs.reg[SH_DWARF_FRAME_MACL].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_MACL].loc.offset
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= (long)&(sc->sc_macl) - new_cfa;
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#if defined (__SH3E__) || defined (__SH4__)
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r = SH_DWARF_FRAME_FP0;
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for (i = 0; i < 16; i++)
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{
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fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
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fs->regs.reg[r+i].loc.offset
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= (long)&(sc->sc_fpregs[i]) - new_cfa;
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}
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r = SH_DWARF_FRAME_XD0;
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for (i = 0; i < 8; i++)
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{
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fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
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fs->regs.reg[r+i].loc.offset
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= (long)&(sc->sc_xfpregs[2*i]) - new_cfa;
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}
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fs->regs.reg[SH_DWARF_FRAME_FPUL].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_FPUL].loc.offset
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= (long)&(sc->sc_fpul) - new_cfa;
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fs->regs.reg[SH_DWARF_FRAME_FPSCR].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_FPSCR].loc.offset
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= (long)&(sc->sc_fpscr) - new_cfa;
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#endif
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fs->regs.reg[SH_DWARF_FRAME_PC].how = REG_SAVED_OFFSET;
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fs->regs.reg[SH_DWARF_FRAME_PC].loc.offset
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= (long)&(sc->sc_pc) - new_cfa;
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fs->retaddr_column = SH_DWARF_FRAME_PC;
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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 /* inhibit_libc */
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