/* Disassemble SH instructions.
   Copyright (C) 1993, 94, 95, 96, 1997 Free Software Foundation, Inc.

This program 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 of the License, or
(at your option) any later version.

This program 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; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#define STATIC_TABLE
#define DEFINE_TABLE

#include "sh-opc.h"
#include "dis-asm.h"

#define LITTLE_BIT 2

static int 
print_insn_shx (memaddr, info)
     bfd_vma memaddr;
     struct disassemble_info *info;
{
  fprintf_ftype fprintf_fn = info->fprintf_func;
  void *stream = info->stream;
  unsigned char insn[2];
  unsigned char nibs[4];
  int status;
  int relmask = ~0;
  sh_opcode_info *op;

  status = info->read_memory_func (memaddr, insn, 2, info);

  if (status != 0) 
    {
      info->memory_error_func (status, memaddr, info);
      return -1;
    }

  if (info->flags & LITTLE_BIT) 
    {
      nibs[0] = (insn[1] >> 4) & 0xf;
      nibs[1] = insn[1] & 0xf;

      nibs[2] = (insn[0] >> 4) & 0xf;
      nibs[3] = insn[0] & 0xf;
    }
  else 
    {
      nibs[0] = (insn[0] >> 4) & 0xf;
      nibs[1] = insn[0] & 0xf;

      nibs[2] = (insn[1] >> 4) & 0xf;
      nibs[3] = insn[1] & 0xf;
    }

  for (op = sh_table; op->name; op++) 
    {
      int n;
      int imm;
      int rn;
      int rm;
      int rb;

      for (n = 0; n < 4; n++)
	{
	  int i = op->nibbles[n];

	  if (i < 16) 
	    {
	      if (nibs[n] == i)
		continue;
	      goto fail;
	    }
	  switch (i)
	    {
	    case BRANCH_8:
	      imm = (nibs[2] << 4) | (nibs[3]);	  
	      if (imm & 0x80)
		imm |= ~0xff;
	      imm = ((char)imm) * 2 + 4 ;
	      goto ok;
	    case BRANCH_12:
	      imm = ((nibs[1]) << 8) | (nibs[2] << 4) | (nibs[3]);
	      if (imm & 0x800)
		imm |= ~0xfff;
	      imm = imm * 2 + 4;
	      goto ok;
	    case IMM_4:
	      imm = nibs[3];
	      goto ok;
	    case IMM_4BY2:
	      imm = nibs[3] <<1;
	      goto ok;
	    case IMM_4BY4:
	      imm = nibs[3] <<2;
	      goto ok;
	    case IMM_8:
	      imm = (nibs[2] << 4) | nibs[3];
	      goto ok;
	    case PCRELIMM_8BY2:
	      imm = ((nibs[2] << 4) | nibs[3]) <<1;
	      relmask  = ~1;
	      goto ok;
	    case PCRELIMM_8BY4:
	      imm = ((nibs[2] << 4) | nibs[3]) <<2;
	      relmask  = ~3;	    
	      goto ok;
	    case IMM_8BY2:
	      imm = ((nibs[2] << 4) | nibs[3]) <<1;
	      goto ok;
	    case IMM_8BY4:
	      imm = ((nibs[2] << 4) | nibs[3]) <<2;
	      goto ok;
	    case DISP_8:
	      imm = (nibs[2] << 4) | (nibs[3]);	  
	      goto ok;
	    case DISP_4:
	      imm = nibs[3];
	      goto ok;
	    case REG_N:
	      rn = nibs[n];
	      break;
	    case REG_M:
	      rm = nibs[n];
	      break;
	    case REG_B:
	      rb = nibs[n] & 0x07;
	      break;	
	    default:
	      abort();
	    }
	}

    ok:
      fprintf_fn (stream,"%s\t", op->name);
      for (n = 0; n < 3 && op->arg[n] != A_END; n++) 
	{
	  if (n && op->arg[1] != A_END)
	    fprintf_fn (stream, ",");
	  switch (op->arg[n]) 
	    {
	    case A_IMM:
	      fprintf_fn (stream, "#%d", (char)(imm));
	      break;
	    case A_R0:
	      fprintf_fn (stream, "r0");
	      break;
	    case A_REG_N:
	      fprintf_fn (stream, "r%d", rn);
	      break;
	    case A_INC_N:
	      fprintf_fn (stream, "@r%d+", rn);	
	      break;
	    case A_DEC_N:
	      fprintf_fn (stream, "@-r%d", rn);	
	      break;
	    case A_IND_N:
	      fprintf_fn (stream, "@r%d", rn);	
	      break;
	    case A_DISP_REG_N:
	      fprintf_fn (stream, "@(%d,r%d)", imm, rn);	
	      break;
	    case A_REG_M:
	      fprintf_fn (stream, "r%d", rm);
	      break;
	    case A_INC_M:
	      fprintf_fn (stream, "@r%d+", rm);	
	      break;
	    case A_DEC_M:
	      fprintf_fn (stream, "@-r%d", rm);	
	      break;
	    case A_IND_M:
	      fprintf_fn (stream, "@r%d", rm);	
	      break;
	    case A_DISP_REG_M:
	      fprintf_fn (stream, "@(%d,r%d)", imm, rm);	
	      break;
            case A_REG_B:
              fprintf_fn (stream, "r%d_bank", rb);
	      break;
	    case A_DISP_PC:
	      fprintf_fn (stream, "0x%0x", imm + 4 + (memaddr & relmask));
	      break;
	    case A_IND_R0_REG_N:
	      fprintf_fn (stream, "@(r0,r%d)", rn);
	      break; 
	    case A_IND_R0_REG_M:
	      fprintf_fn (stream, "@(r0,r%d)", rm);
	      break; 
	    case A_DISP_GBR:
	      fprintf_fn (stream, "@(%d,gbr)",imm);
	      break;
	    case A_R0_GBR:
	      fprintf_fn (stream, "@(r0,gbr)");
	      break;
	    case A_BDISP12:
	    case A_BDISP8:
	      (*info->print_address_func) (imm + memaddr, info);
	      break;
	    case A_SR:
	      fprintf_fn (stream, "sr");
	      break;
	    case A_GBR:
	      fprintf_fn (stream, "gbr");
	      break;
	    case A_VBR:
	      fprintf_fn (stream, "vbr");
	      break;
	    case A_SSR:
	      fprintf_fn (stream, "ssr");
	      break;
	    case A_SPC:
	      fprintf_fn (stream, "spc");
	      break;
	    case A_MACH:
	      fprintf_fn (stream, "mach");
	      break;
	    case A_MACL:
	      fprintf_fn (stream ,"macl");
	      break;
	    case A_PR:
	      fprintf_fn (stream, "pr");
	      break;
	    case F_REG_N:
	      fprintf_fn (stream, "fr%d", rn);
	      break;
	    case F_REG_M:
	      fprintf_fn (stream, "fr%d", rm);
	      break;
	    case FPSCR_M:
	    case FPSCR_N:
	      fprintf_fn (stream, "fpscr");
	      break;
	    case FPUL_M:
	    case FPUL_N:
	      fprintf_fn (stream, "fpul");
	      break;
	    case F_FR0:
	      fprintf_fn (stream, "fr0");
	      break;
	    default:
	      abort();
	    }
	
	}

      if (!(info->flags & 1)
	  && (op->name[0] == 'j'
	      || (op->name[0] == 'b'
		  && (op->name[1] == 'r' 
		      || op->name[1] == 's'))
	      || (op->name[0] == 'r' && op->name[1] == 't')
	      || (op->name[0] == 'b' && op->name[2] == '.')))
	{
	  info->flags |= 1;
	  fprintf_fn (stream, "\t(slot ");
	  print_insn_shx (memaddr + 2, info);
	  info->flags &= ~1;
	  fprintf_fn (stream, ")");
	  return 4;
	}

      return 2;
    fail:
      ;

    }
  fprintf_fn (stream, ".word 0x%x%x%x%x", nibs[0], nibs[1], nibs[2], nibs[3]);
  return 2;
}

int 
print_insn_shl (memaddr, info)
     bfd_vma memaddr;
     struct disassemble_info *info;
{
  int r;

  info->flags = LITTLE_BIT;
  r = print_insn_shx (memaddr, info);
  return r;
}

int 
print_insn_sh (memaddr, info)
     bfd_vma memaddr;
     struct disassemble_info *info;
{
  int r;

  info->flags = 0;
  r = print_insn_shx (memaddr, info);
  return r;
}
