* alias.c, c-common.h, c-incpath.c, c-incpath.h, expr.c,

[official-gcc.git] / gcc / config / sh / linux-unwind.h

/* DWARF2 EH unwinding support for SH Linux.
   Copyright (C) 2004 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 2, 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.

You should have received a copy of the GNU General Public License
along with this program; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Do code reading to identify a signal frame, and set the frame
   state data appropriately.  See unwind-dw2.c for the structs.  */

#include <signal.h>
#include <sys/ucontext.h>
#include "insn-constants.h"

# if defined (__SH5__)
#define SH_DWARF_FRAME_GP0      0
#define SH_DWARF_FRAME_FP0      (__SH5__ == 32 ? 245 : 77)
#define SH_DWARF_FRAME_XD0      289
#define SH_DWARF_FRAME_BT0      68
#define SH_DWARF_FRAME_PR       241
#define SH_DWARF_FRAME_PR_MEDIA 18
#define SH_DWARF_FRAME_GBR      238
#define SH_DWARF_FRAME_MACH     239
#define SH_DWARF_FRAME_MACL     240
#define SH_DWARF_FRAME_PC       64
#define SH_DWARF_FRAME_SR       65
#define SH_DWARF_FRAME_FPUL     244
#define SH_DWARF_FRAME_FPSCR    243
#else
#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      19
#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
#endif /* defined (__SH5__) */

#if defined (__SH5__)
/* MD_FALLBACK_FRAME_STATE_FOR is not yet defined for SHMEDIA.  */
#else /* defined (__SH5__) */

#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 {
        struct siginfo info;
        struct ucontext uc;
      } *rt_ = context->cfa;
      sc = (struct sigcontext *) &rt_->uc.uc_mcontext;
    }
  else
    return _URC_END_OF_STACK;

  new_cfa = sc->sc_regs[15];
  fs->cfa_how = CFA_REG_OFFSET;
  fs->cfa_reg = 15;
  fs->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[i].how = REG_SAVED_OFFSET;
      fs->regs.reg[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;
  return _URC_NO_REASON;
}
#endif /* defined (__SH5__) */