path: root/opcodes/h8300-dis.c

/* Disassemble h8300 instructions.
   Copyright 1993, 1994, 1996, 1998, 2000, 2001, 2002
   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.  */

#define DEFINE_TABLE

#include "sysdep.h"
#define h8_opcodes h8ops
#include "opcode/h8300.h"
#include "dis-asm.h"
#include "opintl.h"
#include "libiberty.h"

struct h8_instruction
{
  int length;
  const struct h8_opcode *opcode;
};

struct h8_instruction *h8_instructions;

static void bfd_h8_disassemble_init PARAMS ((void));
static unsigned int bfd_h8_disassemble
  PARAMS ((bfd_vma, disassemble_info *, int));

/* Run through the opcodes and sort them into order to make them easy
   to disassemble.  */
static void
bfd_h8_disassemble_init ()
{
  unsigned int i;
  unsigned int nopcodes;
  const struct h8_opcode *p;
  struct h8_instruction *pi;

  nopcodes = sizeof (h8_opcodes) / sizeof (struct h8_opcode);
  
  h8_instructions = (struct h8_instruction *)
    xmalloc (nopcodes * sizeof (struct h8_instruction));

  for (p = h8_opcodes, pi = h8_instructions; p->name; p++, pi++)
    {
      int n1 = 0;
      int n2 = 0;

      if ((int) p->data.nib[0] < 16)
	n1 = (int) p->data.nib[0];
      else
	n1 = 0;

      if ((int) p->data.nib[1] < 16)
	n2 = (int) p->data.nib[1];
      else
	n2 = 0;

      /* Just make sure there are an even number of nibbles in it, and
	 that the count is the same as the length.  */
      for (i = 0; p->data.nib[i] != E; i++)
	;

      if (i & 1)
	abort ();

      pi->length = i / 2;
      pi->opcode = p;
    }

  /* Add entry for the NULL vector terminator.  */
  pi->length = 0;
  pi->opcode = p;
}

static unsigned int
bfd_h8_disassemble (addr, info, mode)
     bfd_vma addr;
     disassemble_info *info;
     int mode;
{
  /* Find the first entry in the table for this opcode.  */
  static const char *regnames[] =
    {
      "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
      "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"
    };
  static const char *wregnames[] =
    {
      "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
      "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
    };
  static const char *lregnames[] =
    {
      "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
      "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
    };
  int rs = 0;
  int rd = 0;
  int rdisp = 0;
  int abs = 0;
  int bit = 0;
  int plen = 0;
  static boolean init = 0;
  const struct h8_instruction *qi;
  char const **pregnames = mode != 0 ? lregnames : wregnames;
  int status;
  int l;
  unsigned char data[20];
  void *stream = info->stream;
  fprintf_ftype fprintf = info->fprintf_func;

  if (!init)
    {
      bfd_h8_disassemble_init ();
      init = 1;
    }

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

  for (l = 2; status == 0 && l < 10; l += 2)
    status = info->read_memory_func (addr + l, data + l, 2, info);

  /* Find the exact opcode/arg combo.  */
  for (qi = h8_instructions; qi->opcode->name; qi++)
    {
      const struct h8_opcode *q = qi->opcode;
      op_type *nib = q->data.nib;
      unsigned int len = 0;

      while (1)
	{
	  op_type looking_for = *nib;
	  int thisnib = data[len >> 1];

	  thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);

	  if (looking_for < 16 && looking_for >= 0)
	    {
	      if (looking_for != thisnib)
		goto fail;
	    }
	  else
	    {
	      if ((int) looking_for & (int) B31)
		{
		  if (!(((int) thisnib & 0x8) != 0))
		    goto fail;

		  looking_for = (op_type) ((int) looking_for & ~(int) B31);
		}

	      if ((int) looking_for & (int) B30)
		{
		  if (!(((int) thisnib & 0x8) == 0))
		    goto fail;

		  looking_for = (op_type) ((int) looking_for & ~(int) B30);
		}

	      if (looking_for & DBIT)
		{
		  /* Exclude adds/subs by looking at bit 0 and 2, and
                     make sure the operand size, either w or l,
                     matches by looking at bit 1.  */
		  if ((looking_for & 7) != (thisnib & 7))
		    goto fail;

		  abs = (thisnib & 0x8) ? 2 : 1;
		}
	      else if (looking_for & (REG | IND | INC | DEC))
		{
		  if (looking_for & SRC)
		    rs = thisnib;
		  else
		    rd = thisnib;
		}
	      else if (looking_for & L_16)
		{
		  abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
		  plen = 16;
		}
	      else if (looking_for & ABSJMP)
		{
		  abs = (data[1] << 16) | (data[2] << 8) | (data[3]);
		}
	      else if (looking_for & MEMIND)
		{
		  abs = data[1];
		}
	      else if (looking_for & L_32)
		{
		  int i = len >> 1;

		  abs = (data[i] << 24)
		    | (data[i + 1] << 16)
		    | (data[i + 2] << 8)
		    | (data[i + 3]);

		  plen = 32;
		}
	      else if (looking_for & L_24)
		{
		  int i = len >> 1;

		  abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
		  plen = 24;
		}
	      else if (looking_for & IGNORE)
		{
		  ;
		}
	      else if (looking_for & DISPREG)
		{
		  rdisp = thisnib;
		}
	      else if (looking_for & KBIT)
		{
		  switch (thisnib)
		    {
		    case 9:
		      abs = 4;
		      break;
		    case 8:
		      abs = 2;
		      break;
		    case 0:
		      abs = 1;
		      break;
		    default:
		      goto fail;
		    }
		}
	      else if (looking_for & L_8)
		{
		  plen = 8;
		  abs = data[len >> 1];
		}
	      else if (looking_for & L_3)
		{
		  bit = thisnib & 0x7;
		}
	      else if (looking_for & L_2)
		{
		  plen = 2;
		  abs = thisnib & 0x3;
		}
	      else if (looking_for & MACREG)
		{
		  abs = (thisnib == 3);
		}
	      else if (looking_for == E)
		{
		  int i;

		  for (i = 0; i < qi->length; i++)
		    fprintf (stream, "%02x ", data[i]);

		  for (; i < 6; i++)
		    fprintf (stream, "   ");

		  fprintf (stream, "%s\t", q->name);

		  /* Gross.  Disgusting.  */
		  if (strcmp (q->name, "ldm.l") == 0)
		    {
		      int count, high;

		      count = (data[1] >> 4) & 0x3;
		      high = data[3] & 0x7;

		      fprintf (stream, "@sp+,er%d-er%d", high - count, high);
		      return qi->length;
		    }

		  if (strcmp (q->name, "stm.l") == 0)
		    {
		      int count, low;

		      count = (data[1] >> 4) & 0x3;
		      low = data[3] & 0x7;

		      fprintf (stream, "er%d-er%d,@-sp", low, low + count);
		      return qi->length;
		    }

		  /* Fill in the args.  */
		  {
		    op_type *args = q->args.nib;
		    int hadone = 0;

		    while (*args != E)
		      {
			int x = *args;

			if (hadone)
			  fprintf (stream, ",");

			if (x & L_3)
			  {
			    fprintf (stream, "#0x%x", (unsigned) bit);
			  }
			else if (x & (IMM | KBIT | DBIT))
			  {
			    /* Bletch.  For shal #2,er0 and friends.  */
			    if (*(args + 1) & SRC_IN_DST)
			      abs = 2;

			    fprintf (stream, "#0x%x", (unsigned) abs);
			  }
			else if (x & REG)
			  {
			    int rn = (x & DST) ? rd : rs;

			    switch (x & SIZE)
			      {
			      case L_8:
				fprintf (stream, "%s", regnames[rn]);
				break;
			      case L_16:
				fprintf (stream, "%s", wregnames[rn]);
				break;
			      case L_P:
			      case L_32:
				fprintf (stream, "%s", lregnames[rn]);
				break;
			      }
			  }
			else if (x & MACREG)
			  {
			    fprintf (stream, "mac%c", abs ? 'l' : 'h');
			  }
			else if (x & INC)
			  {
			    fprintf (stream, "@%s+", pregnames[rs]);
			  }
			else if (x & DEC)
			  {
			    fprintf (stream, "@-%s", pregnames[rd]);
			  }
			else if (x & IND)
			  {
			    int rn = (x & DST) ? rd : rs;
			    fprintf (stream, "@%s", pregnames[rn]);
			  }
			else if (x & ABS8MEM)
			  {
			    fprintf (stream, "@0x%x:8", (unsigned) abs);
			  }
			else if (x & (ABS | ABSJMP))
			  {
			    fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
			  }
			else if (x & MEMIND)
			  {
			    fprintf (stream, "@@%d (%x)", abs, abs);
			  }
			else if (x & PCREL)
			  {
			    if (x & L_16)
			      {
				abs += 2;
				fprintf (stream,
					 ".%s%d (%x)",
					 (short) abs > 0 ? "+" : "",
					 (short) abs, addr + (short) abs + 2);
			      }
			    else
			      {
				fprintf (stream,
					 ".%s%d (%x)",
					 (char) abs > 0 ? "+" : "",
					 (char) abs, addr + (char) abs + 2);
			      }
			  }
			else if (x & DISP)
			  {
			    fprintf (stream, "@(0x%x:%d,%s)",
				     abs, plen, pregnames[rdisp]);
			  }
			else if (x & CCR)
			  {
			    fprintf (stream, "ccr");
			  }
			else if (x & EXR)
			  {
			    fprintf (stream, "exr");
			  }
			else
			  /* xgettext:c-format */
			  fprintf (stream, _("Hmmmm %x"), x);

			hadone = 1;
			args++;
		      }
		  }

		  return qi->length;
		}
	      else
		/* xgettext:c-format */
		fprintf (stream, _("Don't understand %x \n"), looking_for);
	    }

	  len++;
	  nib++;
	}

    fail:
      ;
    }

  /* Fell off the end.  */
  fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
	   data[0], data[1],
	   data[0], data[1]);
  return 2;
}

int
print_insn_h8300 (addr, info)
     bfd_vma addr;
     disassemble_info *info;
{
  return bfd_h8_disassemble (addr, info, 0);
}

int
print_insn_h8300h (addr, info)
     bfd_vma addr;
     disassemble_info *info;
{
  return bfd_h8_disassemble (addr, info, 1);
}

int
print_insn_h8300s (addr, info)
     bfd_vma addr;
     disassemble_info *info;
{
  return bfd_h8_disassemble (addr, info, 2);
}