binutils-gdb/opcodes/msp430-dis.c

/* Disassemble MSP430 instructions.
   Copyright (C) 2002-2013 Free Software Foundation, Inc.

   Contributed by Dmitry Diky <diwil@mail.ru>
        
   This file is part of the GNU opcodes library.

   This library 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.

   It 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>

#include "dis-asm.h"
#include "opintl.h"
#include "libiberty.h"

#define DASM_SECTION
#include "opcode/msp430.h"
#undef DASM_SECTION


#define PS(x)   (0xffff & (x))

static unsigned short
msp430dis_opcode (bfd_vma addr, disassemble_info *info)
{
  bfd_byte buffer[2];
  int status;

  status = info->read_memory_func (addr, buffer, 2, info);
  if (status != 0)
    {
      info->memory_error_func (status, addr, info);
      return -1;
    }
  return bfd_getl16 (buffer);
}

static int
msp430_nooperands (struct msp430_opcode_s *opcode,
		   bfd_vma addr ATTRIBUTE_UNUSED,
		   unsigned short insn ATTRIBUTE_UNUSED,
		   char *comm,
		   int *cycles)
{
  /* Pop with constant.  */
  if (insn == 0x43b2)
    return 0;
  if (insn == opcode->bin_opcode)
    return 2;

  if (opcode->fmt == 0)
    {
      if ((insn & 0x0f00) != 3 || (insn & 0x0f00) != 2)
	return 0;

      strcpy (comm, "emulated...");
      *cycles = 1;
    }
  else
    {
      strcpy (comm, "return from interupt");
      *cycles = 5;
    }

  return 2;
}

static int
print_as2_reg_name (int regno, char * op1, char * comm1,
		    int c2, int c3, int cd)
{
  switch (regno)
    {
    case 2:
      sprintf (op1, "#4");
      sprintf (comm1, "r2 As==10");
      return c2;

    case 3:
      sprintf (op1, "#2");
      sprintf (comm1, "r3 As==10");
      return c3;

    default:
      /* Indexed register mode @Rn.  */
      sprintf (op1, "@r%d", regno);
      return cd;
    }
}

static int
print_as3_reg_name (int regno, char * op1, char * comm1,
		    int c2, int c3, int cd)
{
  switch (regno)
    {
    case 2:
      sprintf (op1, "#8");
      sprintf (comm1, "r2 As==11");
      return c2;

    case 3:
      sprintf (op1, "#-1");
      sprintf (comm1, "r3 As==11");
      return c3;

    default:
      /* Post incremented @Rn+.  */
      sprintf (op1, "@r%d+", regno);
      return cd;
    }
}

static int
msp430_singleoperand (disassemble_info *info,
		      struct msp430_opcode_s *opcode,
		      bfd_vma addr,
		      unsigned short insn,
		      char *op,
		      char *comm,
		      unsigned short extension_word,
		      int *cycles)
{
  int regs = 0, regd = 0;
  int ad = 0, as = 0;
  int where = 0;
  int cmd_len = 2;
  int dst = 0;
  int fmt;
  int extended_dst = extension_word & 0xf;

  regd = insn & 0x0f;
  regs = (insn & 0x0f00) >> 8;
  as = (insn & 0x0030) >> 4;
  ad = (insn & 0x0080) >> 7;

  if (opcode->fmt < 0)
    fmt = (- opcode->fmt) - 1;
  else
    fmt = opcode->fmt;

  switch (fmt)
    {
    case 0:			/* Emulated work with dst register.  */
      if (regs != 2 && regs != 3 && regs != 1)
	return 0;

      /* Check if not clr insn.  */
      if (opcode->bin_opcode == 0x4300 && (ad || as))
	return 0;

      /* Check if really inc, incd insns.  */
      if ((opcode->bin_opcode & 0xff00) == 0x5300 && as == 3)
	return 0;

      if (ad == 0)
	{
	  *cycles = 1;

	  /* Register.  */
	  if (regd == 0)
	    {
	      *cycles += 1;
	      sprintf (op, "r0");
	    }
	  else if (regd == 1)
	    sprintf (op, "r1");

	  else if (regd == 2)
	    sprintf (op, "r2");

	  else
	    sprintf (op, "r%d", regd);
	}
      else	/* ad == 1 msp430dis_opcode.  */
	{
	  if (regd == 0)
	    {
	      /* PC relative.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 2;
	      *cycles = 4;
	      sprintf (op, "0x%04x", dst);
	      sprintf (comm, "PC rel. abs addr 0x%04x",
		       PS ((short) (addr + 2) + dst));
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  sprintf (op, "0x%05x", dst);
		  sprintf (comm, "PC rel. abs addr 0x%05lx",
			   (long)((addr + 2 + dst) & 0xfffff));
		}
	    }
	  else if (regd == 2)
	    {
	      /* Absolute.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 2;
	      *cycles = 4;
	      sprintf (op, "&0x%04x", PS (dst));
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  sprintf (op, "&0x%05x", dst & 0xfffff);
		}
	    }
	  else
	    {
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 2;
	      *cycles = 4;
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  if (dst & 0x80000)
		    dst |= -1 << 20;
		}
	      else if (dst & 0x8000)
		dst |= -1 << 16;
	      sprintf (op, "%d(r%d)", dst, regd);
	    }
	}
      break;

    case 2:	/* rrc, push, call, swpb, rra, sxt, push, call, reti etc...  */
      if (as == 0)
	{
	  if (regd == 3)
	    {
	      /* Constsnts.  */
	      sprintf (op, "#0");
	      sprintf (comm, "r3 As==00");
	    }
	  else
	    {
	      /* Register.  */
	      sprintf (op, "r%d", regd);
	    }
	  *cycles = 1;
	}
      else if (as == 2)
	{
	  * cycles = print_as2_reg_name (regd, op, comm, 1, 1, 3);
	}
      else if (as == 3)
	{
	  if (regd == 0)
	    {
	      *cycles = 3;
	      /* absolute. @pc+ */
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 2;
	      sprintf (op, "#%d", dst);
	      if (dst > 9 || dst < 0)
		sprintf (comm, "#0x%04x", PS (dst));
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  if (dst & 0x80000)
		    dst |= -1 << 20;
		  sprintf (op, "#%d", dst);
		  if (dst > 9 || dst < 0)
		    sprintf (comm, "#0x%05x", dst);
		}
	    }
	  else
	    * cycles = print_as3_reg_name (regd, op, comm, 1, 1, 3);
	}
      else if (as == 1)
	{
	  *cycles = 4;
	  if (regd == 0)
	    {
	      /* PC relative.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 2;
	      sprintf (op, "0x%04x", PS (dst));
	      sprintf (comm, "PC rel. 0x%04x",
		       PS ((short) addr + 2 + dst));
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  sprintf (op, "0x%05x", dst & 0xffff);
		  sprintf (comm, "PC rel. 0x%05lx",
			   (long)((addr + 2 + dst) & 0xfffff));
		}
	    }
	  else if (regd == 2)
	    {
	      /* Absolute.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 2;
	      sprintf (op, "&0x%04x", PS (dst));
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  sprintf (op, "&0x%05x", dst & 0xfffff);
		}
	    }
	  else if (regd == 3)
	    {
	      *cycles = 1;
	      sprintf (op, "#1");
	      sprintf (comm, "r3 As==01");
	    }
	  else
	    {
	      /* Indexed.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 2;
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  if (dst & 0x80000)
		    dst |= -1 << 20;
		}
	      else if (dst & 0x8000)
		dst |= -1 << 16;
	      sprintf (op, "%d(r%d)", dst, regd);
	      if (dst > 9 || dst < 0)
		sprintf (comm, "%05x", dst);
	    }
	}
      break;

    case 3:			/* Jumps.  */
      where = insn & 0x03ff;
      if (where & 0x200)
	where |= ~0x03ff;
      if (where > 512 || where < -511)
	return 0;

      where *= 2;
      sprintf (op, "$%+-8d", where + 2);
      sprintf (comm, "abs 0x%lx", (long) (addr + 2 + where));
      *cycles = 2;
      return 2;
      break;
    default:
      cmd_len = 0;
    }

  return cmd_len;
}

static int
msp430_doubleoperand (disassemble_info *info,
		      struct msp430_opcode_s *opcode,
		      bfd_vma addr,
		      unsigned short insn,
		      char *op1,
		      char *op2,
		      char *comm1,
		      char *comm2,
		      unsigned short extension_word,
		      int *cycles)
{
  int regs = 0, regd = 0;
  int ad = 0, as = 0;
  int cmd_len = 2;
  int dst = 0;
  int fmt;
  int extended_dst = extension_word & 0xf;
  int extended_src = (extension_word >> 7) & 0xf;

  regd = insn & 0x0f;
  regs = (insn & 0x0f00) >> 8;
  as = (insn & 0x0030) >> 4;
  ad = (insn & 0x0080) >> 7;

  if (opcode->fmt < 0)
    fmt = (- opcode->fmt) - 1;
  else
    fmt = opcode->fmt;

  if (fmt == 0)
    {
      /* Special case: rla and rlc are the only 2 emulated instructions that
	 fall into two operand instructions.  */
      /* With dst, there are only:
	 Rm       	Register,
         x(Rm)     	Indexed,
         0xXXXX    	Relative,
         &0xXXXX    	Absolute 
         emulated_ins   dst
         basic_ins      dst, dst.  */

      if (regd != regs || as != ad)
	return 0;		/* May be 'data' section.  */

      if (ad == 0)
	{
	  /* Register mode.  */
	  if (regd == 3)
	    {
	      strcpy (comm1, _("Illegal as emulation instr"));
	      return -1;
	    }

	  sprintf (op1, "r%d", regd);
	  *cycles = 1;
	}
      else			/* ad == 1 */
	{
	  if (regd == 0)
	    {
	      /* PC relative, Symbolic.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      cmd_len += 4;
	      *cycles = 6;
	      sprintf (op1, "0x%04x", PS (dst));
	      sprintf (comm1, "PC rel. 0x%04x",
		       PS ((short) addr + 2 + dst));
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  if (dst & 0x80000)
		    dst |= -1 << 20;
		  sprintf (op1, "0x%05x", dst & 0xfffff);
		  sprintf (comm1, "PC rel. 0x%05lx",
			   (long)((addr + 2 + dst) & 0xfffff));
		}
	    }
	  else if (regd == 2)
	    {
	      /* Absolute.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      /* If the 'src' field is not the same as the dst
		 then this is not an rla instruction.  */
	      if (dst != msp430dis_opcode (addr + 4, info))
		return 0;
	      cmd_len += 4;
	      *cycles = 6;
	      sprintf (op1, "&0x%04x", PS (dst));
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  sprintf (op1, "&0x%05x", dst & 0xfffff);
		}
	    }
	  else
	    {
	      /* Indexed.  */
	      dst = msp430dis_opcode (addr + 2, info);
	      if (extended_dst)
		{
		  dst |= extended_dst << 16;
		  if (dst & 0x80000)
		    dst |= -1 << 20;
		}
	      else if (dst & 0x8000)
		dst |= -1 << 16;
	      cmd_len += 4;
	      *cycles = 6;
	      sprintf (op1, "%d(r%d)", dst, regd);
	      if (dst > 9 || dst < -9)
		sprintf (comm1, "#0x%05x", dst);
	    }
	}

      *op2 = 0;
      *comm2 = 0;

      return cmd_len;
    }

  /* Two operands exactly.  */
  if (ad == 0 && regd == 3)
    {
      /* R2/R3 are illegal as dest: may be data section.  */
      strcpy (comm1, _("Illegal as 2-op instr"));
      return -1;
    }

  /* Source.  */
  if (as == 0)
    {
      *cycles = 1;
      if (regs == 3)
	{
	  /* Constants.  */
	  sprintf (op1, "#0");
	  sprintf (comm1, "r3 As==00");
	}
      else
	{
	  /* Register.  */
	  sprintf (op1, "r%d", regs);
	}
    }
  else if (as == 2)
    {
      * cycles = print_as2_reg_name (regs, op1, comm1, 1, 1, regs == 0 ? 3 : 2);
    }
  else if (as == 3)
    {
      if (regs == 0)
	{
	  *cycles = 3;
	  /* Absolute. @pc+.  */
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  sprintf (op1, "#%d", dst);
	  if (dst > 9 || dst < 0)
	    sprintf (comm1, "#0x%04x", PS (dst));
	  if (extended_src)
	    {
	      dst |= extended_src << 16;
	      if (dst & 0x80000)
		dst |= -1 << 20;
	      sprintf (op1, "#%d", dst);
	      if (dst > 9 || dst < 0)
		sprintf (comm1, "0x%05x", dst & 0xfffff);
	    }
	}
      else
	* cycles = print_as3_reg_name (regs, op1, comm1, 1, 1, 2);
    }
  else if (as == 1)
    {
      if (regs == 0)
	{
	  *cycles = 4;
	  /* PC relative.  */
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  sprintf (op1, "0x%04x", PS (dst));
	  sprintf (comm1, "PC rel. 0x%04x",
		   PS ((short) addr + 2 + dst));
	  if (extended_src)
	    {
	      dst |= extended_src << 16;
	      if (dst & 0x80000)
		dst |= -1 << 20;
	      sprintf (op1, "0x%05x", dst & 0xfffff);
	      sprintf (comm1, "PC rel. 0x%05lx",
		       (long) ((addr + 2 + dst) & 0xfffff));
	    }
	}
      else if (regs == 2)
	{
	  *cycles = 2;
	  /* Absolute.  */
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  sprintf (op1, "&0x%04x", PS (dst));
	  sprintf (comm1, "0x%04x", PS (dst));
	  if (extended_src)
	    {
	      dst |= extended_src << 16;
	      sprintf (op1, "&0x%05x", dst & 0xfffff);
	      * comm1 = 0;
	    }
	}
      else if (regs == 3)
	{
	  *cycles = 1;
	  sprintf (op1, "#1");
	  sprintf (comm1, "r3 As==01");
	}
      else
	{
	  *cycles = 3;
	  /* Indexed.  */
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  if (extended_src)
	    {
	      dst |= extended_src << 16;
	      if (dst & 0x80000)
		dst |= -1 << 20;
	    }
	  else if (dst & 0x8000)
	    dst |= -1 << 16;
	  sprintf (op1, "%d(r%d)", dst, regs);
	  if (dst > 9 || dst < -9)
	    sprintf (comm1, "0x%05x", dst);
	}
    }

  /* Destination. Special care needed on addr + XXXX.  */

  if (ad == 0)
    {
      /* Register.  */
      if (regd == 0)
	{
	  *cycles += 1;
	  sprintf (op2, "r0");
	}
      else if (regd == 1)
	sprintf (op2, "r1");

      else if (regd == 2)
	sprintf (op2, "r2");

      else
	sprintf (op2, "r%d", regd);
    }
  else	/* ad == 1.  */
    {
      * cycles += 3;

      if (regd == 0)
	{
	  /* PC relative.  */
	  *cycles += 1;
	  dst = msp430dis_opcode (addr + cmd_len, info);
	  sprintf (op2, "0x%04x", PS (dst));
	  sprintf (comm2, "PC rel. 0x%04x",
		   PS ((short) addr + cmd_len + dst));
	  if (extended_dst)
	    {
	      dst |= extended_dst << 16;
	      if (dst & 0x80000)
		dst |= -1 << 20;
	      sprintf (op2, "0x%05x", dst & 0xfffff);
	      sprintf (comm2, "PC rel. 0x%05lx",
		       (long)((addr + cmd_len + dst) & 0xfffff));
	    }
	  cmd_len += 2;
	}
      else if (regd == 2)
	{
	  /* Absolute.  */
	  dst = msp430dis_opcode (addr + cmd_len, info);
	  cmd_len += 2;
	  sprintf (op2, "&0x%04x", PS (dst));
	  if (extended_dst)
	    {
	      dst |= extended_dst << 16;
	      sprintf (op2, "&0x%05x", dst & 0xfffff);
	    }
	}
      else
	{
	  dst = msp430dis_opcode (addr + cmd_len, info);
	  cmd_len += 2;
	  if (dst & 0x8000)
	    dst |= -1 << 16;
	  if (dst > 9 || dst < 0)
	    sprintf (comm2, "0x%04x", PS (dst));
	  if (extended_dst)
	    {
	      dst |= extended_dst << 16;
	      if (dst & 0x80000)
		dst |= -1 << 20;
	      if (dst > 9 || dst < 0)
		sprintf (comm2, "0x%05x", dst & 0xfffff);
	    }
	  sprintf (op2, "%d(r%d)", dst, regd);
	}
    }

  return cmd_len;
}

static int
msp430_branchinstr (disassemble_info *info,
		    struct msp430_opcode_s *opcode ATTRIBUTE_UNUSED,
		    bfd_vma addr ATTRIBUTE_UNUSED,
		    unsigned short insn,
		    char *op1,
		    char *comm1,
		    int *cycles)
{
  int regs = 0, regd = 0;
  int as = 0;
  int cmd_len = 2;
  short dst = 0;

  regd = insn & 0x0f;
  regs = (insn & 0x0f00) >> 8;
  as = (insn & 0x0030) >> 4;

  if (regd != 0)	/* Destination register is not a PC.  */
    return 0;

  /* dst is a source register.  */
  if (as == 0)
    {
      /* Constants.  */
      if (regs == 3)
	{
	  *cycles = 1;
	  sprintf (op1, "#0");
	  sprintf (comm1, "r3 As==00");
	}
      else
	{
	  /* Register.  */
	  *cycles = 1;
	  sprintf (op1, "r%d", regs);
	}
    }
  else if (as == 2)
    {
      * cycles = print_as2_reg_name (regs, op1, comm1, 2, 1, 2);
    }
  else if (as == 3)
    {
      if (regs == 0)
	{
	  /* Absolute. @pc+  */
	  *cycles = 3;
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  sprintf (op1, "#0x%04x", PS (dst));
	}
      else
	* cycles = print_as3_reg_name (regs, op1, comm1, 1, 1, 2);
    }
  else if (as == 1)
    {
      * cycles = 3;

      if (regs == 0)
	{
	  /* PC relative.  */
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  (*cycles)++;
	  sprintf (op1, "0x%04x", PS (dst));
	  sprintf (comm1, "PC rel. 0x%04x",
		   PS ((short) addr + 2 + dst));
	}
      else if (regs == 2)
	{
	  /* Absolute.  */
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  sprintf (op1, "&0x%04x", PS (dst));
	}
      else if (regs == 3)
	{
	  (*cycles)--;
	  sprintf (op1, "#1");
	  sprintf (comm1, "r3 As==01");
	}
      else
	{
	  /* Indexed.  */
	  dst = msp430dis_opcode (addr + 2, info);
	  cmd_len += 2;
	  if (dst & 0x8000)
	    dst |= -1 << 16;
	  sprintf (op1, "%d(r%d)", dst, regs);
	}
    }

  return cmd_len;
}

static int
msp430x_calla_instr (disassemble_info * info,
		     bfd_vma            addr,
		     unsigned short     insn,
		     char *             op1,
		     char *             comm1,
		     int *              cycles)
{
  unsigned int   ureg = insn & 0xf;
  int            reg = insn & 0xf;
  int            am = (insn & 0xf0) >> 4;
  int            cmd_len = 2;
  unsigned short udst = 0;
  short          dst = 0;

  switch (am)
    {
    case 4: /* CALLA Rdst */
      *cycles = 1;
      sprintf (op1, "r%d", reg);
      break;

    case 5: /* CALLA x(Rdst) */
      *cycles = 3;
      dst = msp430dis_opcode (addr + 2, info);
      cmd_len += 2;
      sprintf (op1, "%d(r%d)", dst, reg);
      if (reg == 0)
	sprintf (comm1, "PC rel. 0x%05lx", (long) (addr + 2 + dst));
      else
	sprintf (comm1, "0x%05x", dst);
      break;

    case 6: /* CALLA @Rdst */
      *cycles = 2;
      sprintf (op1, "@r%d", reg);
      break;

    case 7: /* CALLA @Rdst+ */
      *cycles = 2;
      sprintf (op1, "@r%d+", reg);
      break;

    case 8: /* CALLA &abs20 */
      udst = msp430dis_opcode (addr + 2, info);
      cmd_len += 2;
      *cycles = 4;
      sprintf (op1, "&%d", (ureg << 16) + udst);
      sprintf (comm1, "0x%05x", (ureg << 16) + udst);
      break;

    case 9: /* CALLA pcrel-sym */
      dst = msp430dis_opcode (addr + 2, info);
      cmd_len += 2;
      *cycles = 4;
      sprintf (op1, "%d(PC)", (reg << 16) + dst);
      sprintf (comm1, "PC rel. 0x%05lx",
	       (long) (addr + 2 + dst + (reg << 16)));
      break;

    case 11: /* CALLA #imm20 */
      udst = msp430dis_opcode (addr + 2, info);
      cmd_len += 2;
      *cycles = 4;
      sprintf (op1, "#%d", (ureg << 16) + udst);
      sprintf (comm1, "0x%05x", (ureg << 16) + udst);
      break;

    default:
      strcpy (comm1, _("unrecognised CALLA addressing mode"));
      return -1;
    }

  return cmd_len;
}

int
print_insn_msp430 (bfd_vma addr, disassemble_info *info)
{
  void *stream = info->stream;
  fprintf_ftype prin = info->fprintf_func;
  struct msp430_opcode_s *opcode;
  char op1[32], op2[32], comm1[64], comm2[64];
  int cmd_len = 0;
  unsigned short insn;
  int cycles = 0;
  char *bc = "";
  unsigned short extension_word = 0;

  insn = msp430dis_opcode (addr, info);
  if (insn == (unsigned short) -1)
    {
      prin (stream, ".word	0xffff;	????");
      return 2;
    }

  if (((int) addr & 0xffff) > 0xffdf)
    {
      (*prin) (stream, "interrupt service routine at 0x%04x", 0xffff & insn);
      return 2;
    }

  *comm1 = 0;
  *comm2 = 0;

  /* Check for an extension word.  */
  if ((insn & 0xf800) == 0x1800)
    {
      extension_word = insn;
      addr += 2;
      insn = msp430dis_opcode (addr, info);
      if (insn == (unsigned short) -1)
	{
	  prin (stream, ".word	0x%04x, 0xffff;	????",
		extension_word);
	  return 4;
	}
   }

  for (opcode = msp430_opcodes; opcode->name; opcode++)
    {
      if ((insn & opcode->bin_mask) == opcode->bin_opcode
	  && opcode->bin_opcode != 0x9300)
	{
	  *op1 = 0;
	  *op2 = 0;
	  *comm1 = 0;
	  *comm2 = 0;

	  /* r0 as destination. Ad should be zero.  */
	  if (opcode->insn_opnumb == 3
	      && (insn & 0x000f) == 0
	      && (insn & 0x0080) == 0)
	    {
	      cmd_len +=
		msp430_branchinstr (info, opcode, addr, insn, op1, comm1,
				    &cycles);
	      if (cmd_len)
		break;
	    }

	  switch (opcode->insn_opnumb)
	    {
	      int n;
	      int reg;

	    case 4:
	      cmd_len += msp430x_calla_instr (info, addr, insn,
					      op1, comm1, & cycles);
	      break;

	    case 5: /* PUSHM/POPM */
	      n = (insn & 0xf0) >> 4;
	      reg = (insn & 0xf);

	      sprintf (op1, "#%d", n + 1);
	      if (opcode->bin_opcode == 0x1400)
		/* PUSHM */
		sprintf (op2, "r%d", reg);
	      else
		/* POPM */
		sprintf (op2, "r%d", reg + n);
	      if (insn & 0x100)
		sprintf (comm1, "16-bit words");
	      else
		{
		  sprintf (comm1, "20-bit words");
		  bc =".a";
		}
	      
	      cycles = 2; /*FIXME*/
	      cmd_len = 2;
	      break;

	    case 6: /* RRAM, RRCM, RRUM, RLAM.  */
	      n = ((insn >> 10) & 0x3) + 1;
	      reg = (insn & 0xf);
	      if ((insn & 0x10) == 0)
		bc =".a";
	      sprintf (op1, "#%d", n);
	      sprintf (op2, "r%d", reg);
	      cycles = 2; /*FIXME*/
	      cmd_len = 2;
	      break;

	    case 8: /* ADDA, CMPA, SUBA.  */
	      reg = (insn & 0xf);
	      n = (insn >> 8) & 0xf;
	      if (insn & 0x40)
		{
		  sprintf (op1, "r%d", n);
		  cmd_len = 2;
		}
	      else
		{
		  n <<= 16;
		  n |= msp430dis_opcode (addr + 2, info);
		  sprintf (op1, "#%d", n);
		  if (n > 9 || n < 0)
		    sprintf (comm1, "0x%05x", n);
		  cmd_len = 4;
		}
	      sprintf (op2, "r%d", reg);
	      cycles = 2; /*FIXME*/
	      break;

	    case 9: /* MOVA */
	      reg = (insn & 0xf);
	      n = (insn >> 8) & 0xf;
	      switch ((insn >> 4) & 0xf)
		{
		case 0: /* MOVA @Rsrc, Rdst */
		  cmd_len = 2;
		  sprintf (op1, "@r%d", n);
		  if (strcmp (opcode->name, "bra") != 0)
		    sprintf (op2, "r%d", reg);
		  break;
		  
		case 1: /* MOVA @Rsrc+, Rdst */
		  cmd_len = 2;
		  if (strcmp (opcode->name, "reta") != 0)
		    {
		      sprintf (op1, "@r%d+", n);
		      if (strcmp (opcode->name, "bra") != 0)
			sprintf (op2, "r%d", reg);
		    }
		  break;
		  
		case 2: /* MOVA &abs20, Rdst */
		  cmd_len = 4;
		  n <<= 16;
		  n |= msp430dis_opcode (addr + 2, info);
		  sprintf (op1, "&%d", n);
		  if (n > 9 || n < 0)
		    sprintf (comm1, "0x%05x", n);
		  if (strcmp (opcode->name, "bra") != 0)
		    sprintf (op2, "r%d", reg);
		  break;
		  
		case 3: /* MOVA x(Rsrc), Rdst */
		  cmd_len = 4;
		  if (strcmp (opcode->name, "bra") != 0)
		    sprintf (op2, "r%d", reg);
		  reg = n;
		  n = msp430dis_opcode (addr + 2, info);
		  if (n & 0x8000)
		    n |= -1 << 16;
		  sprintf (op1, "%d(r%d)", n, reg);
		  if (n > 9 || n < 0)
		    {
		      if (reg == 0)
			sprintf (comm1, "PC rel. 0x%05lx",
				 (long) (addr + 2 + n));
		      else
			sprintf (comm1, "0x%05x", n);
		    }
		  break;

		case 6: /* MOVA Rsrc, &abs20 */
		  cmd_len = 4;
		  reg <<= 16;
		  reg |= msp430dis_opcode (addr + 2, info);
		  sprintf (op1, "r%d", n);
		  sprintf (op2, "&%d", reg);
		  if (reg > 9 || reg < 0)
		    sprintf (comm2, "0x%05x", reg);
		  break;

		case 7: /* MOVA Rsrc, x(Rdst) */
		  cmd_len = 4;
		  sprintf (op1, "r%d", n);
		  n = msp430dis_opcode (addr + 2, info);
		  if (n & 0x8000)
		    n |= -1 << 16;
		  sprintf (op2, "%d(r%d)", n, reg);
		  if (n > 9 || n < 0)
		    {
		      if (reg == 0)
			sprintf (comm2, "PC rel. 0x%05lx",
				 (long) (addr + 2 + n));
		      else
			sprintf (comm2, "0x%05x", n);
		    }
		  break;
		  
		case 8: /* MOVA #imm20, Rdst */
		  cmd_len = 4;
		  n <<= 16;
		  n |= msp430dis_opcode (addr + 2, info);
		  if (n & 0x80000)
		    n |= -1 << 20;
		  sprintf (op1, "#%d", n);
		  if (n > 9 || n < 0)
		    sprintf (comm1, "0x%05x", n);
		  if (strcmp (opcode->name, "bra") != 0)
		    sprintf (op2, "r%d", reg);
		  break;
		  
		case 12: /* MOVA Rsrc, Rdst */
		  cmd_len = 2;
		  sprintf (op1, "r%d", n);
		  if (strcmp (opcode->name, "bra") != 0)
		    sprintf (op2, "r%d", reg);
		  break;

		default:
		  break;
		}
	      cycles = 2; /* FIXME */
	      break;
	    }

	  if (cmd_len)
	    break;

	  switch (opcode->insn_opnumb)
	    {
	    case 0:
	      cmd_len += msp430_nooperands (opcode, addr, insn, comm1, &cycles);
	      break;
	    case 2:
	      cmd_len +=
		msp430_doubleoperand (info, opcode, addr, insn, op1, op2,
				      comm1, comm2,
				      extension_word,
				      &cycles);
	      if (insn & BYTE_OPERATION)
		{
		  if (extension_word != 0 && ((extension_word & BYTE_OPERATION) == 0))
		    bc = ".a";
		  else
		    bc = ".b";
		}
	      else if (extension_word)
		{
		  if (extension_word & (1 << 6))
		    bc = ".w";
		  else
		    {
		      bc = ".?";
		      sprintf (comm2, _("Reserved use of A/L and B/W bits detected"));
		    }
		}
	      
	      break;
	    case 1:
	      cmd_len +=
		msp430_singleoperand (info, opcode, addr, insn, op1, comm1,
				      extension_word,
				      &cycles);
	      if (extension_word
		  && (strcmp (opcode->name, "swpb") == 0
		      || strcmp (opcode->name, "sxt") == 0))
		{
		  if (insn & BYTE_OPERATION)
		    {
		      bc = ".?";
		      sprintf (comm2, _("Reserved use of A/L and B/W bits detected"));
		    }
		  else if (extension_word & BYTE_OPERATION)
		    bc = ".w";
		  else
		    bc = ".a";
		}
	      else if (insn & BYTE_OPERATION && opcode->fmt != 3)
		{
		  if (extension_word != 0 && ((extension_word & BYTE_OPERATION) == 0))
		    bc = ".a";
		  else
		    bc = ".b";
		}
	      else if (extension_word)
		{
		  if (extension_word & (1 << 6))
		    bc = ".w";
		  else
		    {
		      bc = ".?";
		      sprintf (comm2, _("Reserved use of A/L and B/W bits detected"));
		    }
		}
	      break;
	    default:
	      break;
	    }
	}

      if (cmd_len)
	break;
    }

  if (cmd_len < 1)
    {
      /* Unknown opcode, or invalid combination of operands.  */
      if (extension_word)
	{
	  prin (stream, ".word	0x%04x, 0x%04x;	????", extension_word, PS (insn));
	  if (*comm1)
	    prin (stream, "\t %s", comm1);
	  return 4;
	}
      (*prin) (stream, ".word	0x%04x;	????", PS (insn));
      return 2;
    }

  /* Display the repeat count (if set) for extended register mode.  */
  if (cmd_len == 2 && ((extension_word & 0xf) != 0))
    {
      if (extension_word & (1 << 7))
	prin (stream, "rpt r%d { ", extension_word & 0xf);
      else
	prin (stream, "rpt #%d { ", (extension_word & 0xf) + 1);
    }

  if (extension_word && opcode->name[strlen (opcode->name) - 1] != 'x')
    (*prin) (stream, "%sx%s", opcode->name, bc);
  else
    (*prin) (stream, "%s%s", opcode->name, bc);

  if (*op1)
    (*prin) (stream, "\t%s", op1);
  if (*op2)
    (*prin) (stream, ",");

  if (strlen (op1) < 7)
    (*prin) (stream, "\t");
  if (!strlen (op1))
    (*prin) (stream, "\t");

  if (*op2)
    (*prin) (stream, "%s", op2);
  if (strlen (op2) < 8)
    (*prin) (stream, "\t");

  if (*comm1 || *comm2)
    (*prin) (stream, ";");
  else if (cycles)
    {
      if (*op2)
	(*prin) (stream, ";");
      else
	{
	  if (strlen (op1) < 7)
	    (*prin) (stream, ";");
	  else
	    (*prin) (stream, "\t;");
	}
    }
  if (*comm1)
    (*prin) (stream, "%s", comm1);
  if (*comm1 && *comm2)
    (*prin) (stream, ",");
  if (*comm2)
    (*prin) (stream, " %s", comm2);

  if (extension_word)
    cmd_len += 2;

  return cmd_len;
}