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/* DWARF2 EH unwinding support for SH Linux.
Copyright (C) 2004-2022 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC 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 General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs.
Don't use this at all if inhibit_libc is used. */
#ifndef inhibit_libc
#include <signal.h>
#include <sys/ucontext.h>
#include "insn-constants.h"
#define SH_DWARF_FRAME_GP0 0
#define SH_DWARF_FRAME_FP0 25
#define SH_DWARF_FRAME_XD0 87
#define SH_DWARF_FRAME_PR 17
#define SH_DWARF_FRAME_GBR 18
#define SH_DWARF_FRAME_MACH 20
#define SH_DWARF_FRAME_MACL 21
#define SH_DWARF_FRAME_PC 16
#define SH_DWARF_FRAME_SR 22
#define SH_DWARF_FRAME_FPUL 23
#define SH_DWARF_FRAME_FPSCR 24
#define MD_FALLBACK_FRAME_STATE_FOR sh_fallback_frame_state
static _Unwind_Reason_Code
sh_fallback_frame_state (struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
unsigned char *pc = context->ra;
struct sigcontext *sc;
long new_cfa;
int i;
#if defined (__SH3E__) || defined (__SH4__)
int r;
#endif
/* mov.w 1f,r3; trapa #0x10; 1: .short 0x77 (sigreturn) */
/* mov.w 1f,r3; trapa #0x10; 1: .short 0xad (rt_sigreturn) */
/* Newer kernel uses pad instructions to avoid an SH-4 core bug. */
/* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0;
or r0,r0; 1: .short 0x77 (sigreturn) */
/* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0;
or r0,r0; 1: .short 0xad (rt_sigreturn) */
if (((*(unsigned short *) (pc+0) == 0x9300)
&& (*(unsigned short *) (pc+2) == 0xc310)
&& (*(unsigned short *) (pc+4) == 0x0077))
|| (((*(unsigned short *) (pc+0) == 0x9305)
&& (*(unsigned short *) (pc+2) == 0xc310)
&& (*(unsigned short *) (pc+14) == 0x0077))))
sc = context->cfa;
else if (((*(unsigned short *) (pc+0) == 0x9300)
&& (*(unsigned short *) (pc+2) == 0xc310)
&& (*(unsigned short *) (pc+4) == 0x00ad))
|| (((*(unsigned short *) (pc+0) == 0x9305)
&& (*(unsigned short *) (pc+2) == 0xc310)
&& (*(unsigned short *) (pc+14) == 0x00ad))))
{
struct rt_sigframe {
siginfo_t info;
ucontext_t uc;
} *rt_ = context->cfa;
/* The void * cast is necessary to avoid an aliasing warning.
The aliasing warning is correct, but should not be a problem
because it does not alias anything. */
sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext;
}
else
return _URC_END_OF_STACK;
new_cfa = sc->sc_regs[15];
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 15;
fs->regs.cfa_offset = new_cfa - (long) context->cfa;
for (i = 0; i < 15; i++)
{
fs->regs.reg[i].how = REG_SAVED_OFFSET;
fs->regs.reg[i].loc.offset
= (long)&(sc->sc_regs[i]) - new_cfa;
}
fs->regs.reg[SH_DWARF_FRAME_PR].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_PR].loc.offset
= (long)&(sc->sc_pr) - new_cfa;
fs->regs.reg[SH_DWARF_FRAME_SR].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_SR].loc.offset
= (long)&(sc->sc_sr) - new_cfa;
fs->regs.reg[SH_DWARF_FRAME_GBR].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_GBR].loc.offset
= (long)&(sc->sc_gbr) - new_cfa;
fs->regs.reg[SH_DWARF_FRAME_MACH].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_MACH].loc.offset
= (long)&(sc->sc_mach) - new_cfa;
fs->regs.reg[SH_DWARF_FRAME_MACL].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_MACL].loc.offset
= (long)&(sc->sc_macl) - new_cfa;
#if defined (__SH3E__) || defined (__SH4__)
r = SH_DWARF_FRAME_FP0;
for (i = 0; i < 16; i++)
{
fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
fs->regs.reg[r+i].loc.offset
= (long)&(sc->sc_fpregs[i]) - new_cfa;
}
r = SH_DWARF_FRAME_XD0;
for (i = 0; i < 8; i++)
{
fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
fs->regs.reg[r+i].loc.offset
= (long)&(sc->sc_xfpregs[2*i]) - new_cfa;
}
fs->regs.reg[SH_DWARF_FRAME_FPUL].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_FPUL].loc.offset
= (long)&(sc->sc_fpul) - new_cfa;
fs->regs.reg[SH_DWARF_FRAME_FPSCR].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_FPSCR].loc.offset
= (long)&(sc->sc_fpscr) - new_cfa;
#endif
fs->regs.reg[SH_DWARF_FRAME_PC].how = REG_SAVED_OFFSET;
fs->regs.reg[SH_DWARF_FRAME_PC].loc.offset
= (long)&(sc->sc_pc) - new_cfa;
fs->retaddr_column = SH_DWARF_FRAME_PC;
fs->signal_frame = 1;
return _URC_NO_REASON;
}
#endif /* inhibit_libc */
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