[deliverable/binutils-gdb.git] / opcodes / m68hc11-dis.c

/* m68hc11-dis.c -- Motorola 68HC11 & 68HC12 disassembly
   Copyright (C) 1999-2020 Free Software Foundation, Inc.
   Written by Stephane Carrez (stcarrez@nerim.fr)
   XGATE and S12X added by James Murray (jsm@jsm-net.demon.co.uk)

   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 "opcode/m68hc11.h"
#include "disassemble.h"

#define PC_REGNUM 3

static const char *const reg_name[] =
{
  "X", "Y", "SP", "PC"
};

static const char *const reg_src_table[] =
{
  "A", "B", "CCR", "TMP3", "D", "X", "Y", "SP"
};

static const char *const reg_dst_table[] =
{
  "A", "B", "CCR", "TMP2", "D", "X", "Y", "SP"
};

#define OP_PAGE_MASK (M6811_OP_PAGE2|M6811_OP_PAGE3|M6811_OP_PAGE4)


static int
read_memory (bfd_vma memaddr, bfd_byte* buffer, int size,
             struct disassemble_info* info)
{
  int status;

  /* Get first byte.  Only one at a time because we don't know the
     size of the insn.  */
  status = (*info->read_memory_func) (memaddr, buffer, size, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, memaddr, info);
      return -1;
    }
  return 0;
}


/* Read the 68HC12 indexed operand byte and print the corresponding mode.
   Returns the number of bytes read or -1 if failure.  */
static int
print_indexed_operand (bfd_vma memaddr, struct disassemble_info* info,
                       int* indirect, int mov_insn, int pc_offset,
                       bfd_vma endaddr, int arch)
{
  bfd_byte buffer[4];
  int reg;
  int status;
  bfd_vma val;
  int pos = 1;

  if (indirect)
    *indirect = 0;

  status = read_memory (memaddr, &buffer[0], 1, info);
  if (status != 0)
    {
      return status;
    }

  /* n,r with 5-bits signed constant.  */
  if ((buffer[0] & 0x20) == 0)
    {
      reg = (buffer[0] >> 6) & 3;
      val = ((buffer[0] & 0x1f) ^ 0x10) - 0x10;
      /* 68HC12 requires an adjustment for movb/movw pc relative modes.  */
      if (reg == PC_REGNUM && info->mach == bfd_mach_m6812 && mov_insn)
        val += pc_offset;
      (*info->fprintf_func) (info->stream, "0x%x,%s",
                             (unsigned) val & 0xffff, reg_name[reg]);

      if (reg == PC_REGNUM)
        {
          (* info->fprintf_func) (info->stream, " {");
           /* Avoid duplicate 0x from core binutils.  */
          if (info->symtab_size > 0)
            (*info->fprintf_func) (info->stream, "0x");
          (* info->print_address_func) (endaddr + val, info);
          (* info->fprintf_func) (info->stream, "}");
        }
    }

  /* Auto pre/post increment/decrement.  */
  else if ((buffer[0] & 0xc0) != 0xc0)
    {
      const char *mode;

      reg = (buffer[0] >> 6) & 3;
      val = buffer[0] & 7;
      if (buffer[0] & 8)
        {
          val = 8 - val;
          mode = "-";
        }
      else
        {
          val = val + 1;
          mode = "+";
        }
      (*info->fprintf_func) (info->stream, "%d,%s%s%s",
                             (unsigned) val,
                             buffer[0] & 0x10 ? "" : mode,
                             reg_name[reg], buffer[0] & 0x10 ? mode : "");
    }

  /* [n,r] 16-bits offset indexed indirect.  */
  else if ((buffer[0] & 0x07) == 3)
    {
      if ((mov_insn) && (!(arch & cpu9s12x)))
        {
          (*info->fprintf_func) (info->stream, "<invalid op: 0x%x>",
                                 buffer[0] & 0x0ff);
          return 0;
        }
      reg = (buffer[0] >> 3) & 0x03;
      status = read_memory (memaddr + pos, &buffer[0], 2, info);
      if (status != 0)
        return status;

      pos += 2;
      val = (buffer[0] << 8) | buffer[1];
      (*info->fprintf_func) (info->stream, "[0x%x,%s]",
                             (unsigned) val & 0xffff, reg_name[reg]);
      if (indirect)
        *indirect = 1;
    }

  /* n,r with 9 and 16 bit signed constant.  */
  else if ((buffer[0] & 0x4) == 0)
    {
      if ((mov_insn) && (!(arch & cpu9s12x)))
        {
          (*info->fprintf_func) (info->stream, "<invalid op: 0x%x>",
                                 buffer[0] & 0x0ff);
          return 0;
        }

      reg = (buffer[0] >> 3) & 0x03;
      status = read_memory (memaddr + pos,
                            &buffer[1], (buffer[0] & 0x2 ? 2 : 1), info);
      if (status != 0)
        return status;

      if (buffer[0] & 2)
        {
          val = (((buffer[1] << 8) | buffer[2]) ^ 0x8000) - 0x8000;
          pos += 2;
          endaddr += 2;
        }
      else
        {
          val = buffer[1] - ((buffer[0] & 1) << 8);
          pos++;
          endaddr++;
        }
      (*info->fprintf_func) (info->stream, "0x%x,%s",
                             (unsigned) val & 0xffff, reg_name[reg]);
      if (reg == PC_REGNUM)
        {
          (* info->fprintf_func) (info->stream, " {0x");
          (* info->print_address_func) (endaddr + val, info);
          (* info->fprintf_func) (info->stream, "}");
        }
    }
  else
    {
      reg = (buffer[0] >> 3) & 0x03;
      switch (buffer[0] & 3)
        {
        case 0:
          (*info->fprintf_func) (info->stream, "A,%s", reg_name[reg]);
          break;
        case 1:
          (*info->fprintf_func) (info->stream, "B,%s", reg_name[reg]);
          break;
        case 2:
          (*info->fprintf_func) (info->stream, "D,%s", reg_name[reg]);
          break;
        case 3:
        default:
          (*info->fprintf_func) (info->stream, "[D,%s]", reg_name[reg]);
          if (indirect)
            *indirect = 1;
          break;
        }
    }

  return pos;
}

/* Disassemble one instruction at address 'memaddr'.  Returns the number
   of bytes used by that instruction.  */
static int
print_insn (bfd_vma memaddr, struct disassemble_info* info, int arch)
{
  int status;
  bfd_byte buffer[4];
  unsigned int code;
  long format, pos, i;
  bfd_vma val;
  const struct m68hc11_opcode *opcode;

  if (arch & cpuxgate)
    {
      /* Get two bytes as all XGATE instructions are 16bit.  */
      status = read_memory (memaddr, buffer, 2, info);
      if (status != 0)
        return status;

      format = 0;
      code = (buffer[0] << 8) + buffer[1];

      /* Scan the opcode table until we find the opcode
         with the corresponding page.  */
      opcode = m68hc11_opcodes;
      for (i = 0; i < m68hc11_num_opcodes; i++, opcode++)
        {
          if ((opcode->opcode != (code & opcode->xg_mask)) || (opcode->arch != cpuxgate))
            continue;
          /* We have found the opcode.  Extract the operand and print it.  */
          (*info->fprintf_func) (info->stream, "%s", opcode->name);
          format = opcode->format;
          if (format & (M68XG_OP_NONE))
            {
              /* Nothing to print.  */
            }
          else if (format & M68XG_OP_IMM3)
            (*info->fprintf_func) (info->stream, " #0x%x", (code >> 8) & 0x7);
          else if (format & M68XG_OP_R_R)
            (*info->fprintf_func) (info->stream, " R%x, R%x",
                                   (code >> 8) & 0x7, (code >> 5) & 0x7);
          else if (format & M68XG_OP_R_R_R)
            (*info->fprintf_func) (info->stream, " R%x, R%x, R%x",
                                   (code >> 8) & 0x7, (code >> 5) & 0x7, (code >> 2) & 0x7);
          else if (format & M68XG_OP_RD_RB_RI)
            (*info->fprintf_func) (info->stream, " R%x, (R%x, R%x)",
                                   (code >> 8) & 0x7, (code >> 5) & 0x7, (code >> 2) & 0x7);
          else if (format & M68XG_OP_RD_RB_RIp)
            (*info->fprintf_func) (info->stream, " R%x, (R%x, R%x+)",
                                   (code >> 8) & 0x7, (code >> 5) & 0x7, (code >> 2) & 0x7);
          else if (format & M68XG_OP_RD_RB_mRI)
            (*info->fprintf_func) (info->stream, " R%x, (R%x, -R%x)",
                                   (code >> 8) & 0x7, (code >> 5) & 0x7, (code >> 2) & 0x7);
          else if (format & M68XG_OP_R_R_OFFS5)
            (*info->fprintf_func) (info->stream, " R%x, (R%x, #0x%x)",
                                   (code >> 8) & 0x7, (code >> 5) & 0x7, code & 0x1f);
          else if (format & M68XG_OP_R_IMM8)
            (*info->fprintf_func) (info->stream, " R%x, #0x%02x",
                                   (code >> 8) & 0x7, code & 0xff);
          else if (format & M68XG_OP_R_IMM4)
            (*info->fprintf_func) (info->stream, " R%x, #0x%x",
                                   (code >> 8) & 0x7, (code & 0xf0) >> 4);
          else if (format & M68XG_OP_REL9)
            {
              (*info->fprintf_func) (info->stream, " 0x");
              val = buffer[1] - ((buffer[0] & 1) << 8);
              (*info->print_address_func) (memaddr + (val << 1) + 2, info);
            }
          else if (format & M68XG_OP_REL10)
            {
              (*info->fprintf_func) (info->stream, " 0x");
              val = (buffer[0] << 8) | buffer[1];
              val = ((val & 0x3ff) ^ 0x200) - 0x200;
              (*info->print_address_func) (memaddr + (val << 1) + 2, info);
            }
          else if ((code & 0x00ff) == 0x00f8)
            (*info->fprintf_func) (info->stream, " R%x, CCR", (code >> 8) & 0x7);
          else if ((code & 0x00ff) == 0x00f9)
            (*info->fprintf_func) (info->stream, " CCR, R%x", (code >> 8) & 0x7);
          else if ((code & 0x00ff) == 0x0)
            (*info->fprintf_func) (info->stream, " R%x, PC", (code >> 8) & 0x7);
          else if (format & M68XG_OP_R)
            {
              /* Special cases for TFR.  */
              if ((code & 0xf8ff) == 0x00f8)
                (*info->fprintf_func) (info->stream, " R%x, CCR", (code >> 8) & 0x7);
              else if ((code & 0xf8ff) == 0x00f9)
                (*info->fprintf_func) (info->stream, " CCR, R%x", (code >> 8) & 0x7);
              else if ((code & 0xf8ff) == 0x00fa)
                (*info->fprintf_func) (info->stream, " R%x, PC",  (code >> 8) & 0x7);
              else
                (*info->fprintf_func) (info->stream, " R%x", (code >> 8) & 0x7);
            }
          else
            /* Opcode not recognized.  */
            (*info->fprintf_func) (info->stream, "Not yet handled TEST .byte\t0x%04x", code);
          return 2;
        }

      /* Opcode not recognized.  */
      (*info->fprintf_func) (info->stream, ".byte\t0x%04x", code);
      return 2; /* Everything is two bytes.  */
    }

  /* HC11 and HC12.  */

  /* Get first byte.  Only one at a time because we don't know the
     size of the insn.  */
  status = read_memory (memaddr, buffer, 1, info);
  if (status != 0)
    return status;

  format = 0;
  code = buffer[0];
  pos = 0;

  /* Look for page2,3,4 opcodes.  */
  if (code == M6811_OPCODE_PAGE2)
    {
      pos++;
      format = M6811_OP_PAGE2;
    }
  else if (code == M6811_OPCODE_PAGE3 && arch == cpu6811)
    {
      pos++;
      format = M6811_OP_PAGE3;
    }
  else if (code == M6811_OPCODE_PAGE4 && arch == cpu6811)
    {
      pos++;
      format = M6811_OP_PAGE4;
    }

  /* We are in page2,3,4; get the real opcode.  */
  if (pos == 1)
    {
      status = read_memory (memaddr + pos, &buffer[1], 1, info);
      if (status != 0)
        return status;

      code = buffer[1];
    }

  /* Look first for a 68HC12 alias.  All of them are 2-bytes long and
     in page 1.  There is no operand to print.  We read the second byte
     only when we have a possible match.  */
  if ((arch & cpu6812) && format == 0)
    {
      int must_read = 1;

      /* Walk the alias table to find a code1+code2 match.  */
      for (i = 0; i < m68hc12_num_alias; i++)
        {
          if (m68hc12_alias[i].code1 == code)
            {
              if (must_read)
                {
                  status = read_memory (memaddr + pos + 1,
                                        &buffer[1], 1, info);
                  if (status != 0)
                    break;

                  must_read = 1;
                }
              if (m68hc12_alias[i].code2 == (unsigned char) buffer[1])
                {
                  (*info->fprintf_func) (info->stream, "%s",
                                         m68hc12_alias[i].name);
                  return 2;
                }
            }
        }
    }

  pos++;

  /* Scan the opcode table until we find the opcode
     with the corresponding page.  */
  opcode = m68hc11_opcodes;
  for (i = 0; i < m68hc11_num_opcodes; i++, opcode++)
    {
      int offset;
      int pc_src_offset;
      int pc_dst_offset = 0;

      if ((opcode->arch & arch) == 0)
        continue;
      if (opcode->opcode != code)
        continue;
      if ((opcode->format & OP_PAGE_MASK) != format)
        continue;

      if (opcode->format & M6812_OP_REG)
        {
          int j;
          int is_jump;

          if (opcode->format & M6811_OP_JUMP_REL)
            is_jump = 1;
          else
            is_jump = 0;

          status = read_memory (memaddr + pos, &buffer[0], 1, info);
          if (status != 0)
            {
              return status;
            }
          for (j = 0; i + j < m68hc11_num_opcodes; j++)
            {
              if ((opcode[j].arch & arch) == 0)
                continue;
              if (opcode[j].opcode != code)
                continue;
              if (is_jump)
                {
                  if (!(opcode[j].format & M6811_OP_JUMP_REL))
                    continue;

                  if ((opcode[j].format & M6812_OP_IBCC_MARKER)
                      && (buffer[0] & 0xc0) != 0x80)
                    continue;
                  if ((opcode[j].format & M6812_OP_TBCC_MARKER)
                      && (buffer[0] & 0xc0) != 0x40)
                    continue;
                  if ((opcode[j].format & M6812_OP_DBCC_MARKER)
                      && (buffer[0] & 0xc0) != 0)
                    continue;
                  if ((opcode[j].format & M6812_OP_EQ_MARKER)
                      && (buffer[0] & 0x20) == 0)
                    break;
                  if (!(opcode[j].format & M6812_OP_EQ_MARKER)
                      && (buffer[0] & 0x20) != 0)
                    break;
                  continue;
                }
              if (opcode[j].format & M6812_OP_EXG_MARKER && buffer[0] & 0x80)
                break;
              if ((opcode[j].format & M6812_OP_SEX_MARKER)
                  && (((buffer[0] & 0x07) >= 3 && (buffer[0] & 7) <= 7))
                  && ((buffer[0] & 0x0f0) <= 0x20))
                break;
              if ((opcode[j].format & M6812_OP_SEX_MARKER)
                  && (arch & cpu9s12x)
                  && ((buffer[0] == 0x4d) || (buffer[0] == 0x4e)))
                break;
              if (opcode[j].format & M6812_OP_TFR_MARKER
                  && !(buffer[0] & 0x80))
                break;
            }
          if (i + j < m68hc11_num_opcodes)
            opcode = &opcode[j];
        }

      /* We have found the opcode.  Extract the operand and print it.  */
      (*info->fprintf_func) (info->stream, "%s", opcode->name);

      format = opcode->format;
      if (format & (M6811_OP_MASK | M6811_OP_BITMASK
                    | M6811_OP_JUMP_REL | M6812_OP_JUMP_REL16))
        {
          (*info->fprintf_func) (info->stream, "\t");
        }

      /* The movb and movw must be handled in a special way...
         The source constant 'ii' is not always at the same place.
         This is the same for the destination for the post-indexed byte.
         The 'offset' is used to do the appropriate correction.

         offset          offset
         for constant     for destination
         movb   18 OB ii hh ll       0          0
         18 08 xb ii          1          -1
         18 08 xb ff ii       2          1  9 bit
         18 08 xb ee ff ii    3          1  16 bit
         18 0C hh ll hh ll    0          0
         18 09 xb hh ll       1          -1
         18 0D xb hh ll       0          0
         18 0A xb xb          0          0

         movw   18 03 jj kk hh ll    0          0
         18 00 xb jj kk       1          -1
         18 04 hh ll hh ll    0          0
         18 01 xb hh ll       1          -1
         18 05 xb hh ll       0          0
         18 02 xb xb          0          0

         After the source operand is read, the position 'pos' is incremented
         this explains the negative offset for destination.

         movb/movw above are the only instructions with this matching
         format.  */
      offset = ((format & M6812_OP_IDX_P2)
                && (format & (M6811_OP_IMM8 | M6811_OP_IMM16 |
                              M6811_OP_IND16)));

      if (offset)
        {
          /* Check xb to see position of data.  */
          status = read_memory (memaddr + pos, &buffer[0], 1, info);
          if (status != 0)
            {
              return status;
            }

          if (((buffer[0] & 0xe0) == 0xe0) && ((buffer[0] & 0x04) == 0))
            {
              /* 9 or 16 bit.  */
              if ((buffer[0] & 0x02) == 0)
                {
                  /* 9 bit.  */
                  offset = 2;
                }
              else
                {
                  /* 16 bit.  */
                  offset = 3;
                }
            }
        }

      /* Operand with one more byte: - immediate, offset,
         direct-low address.  */
      if (format &
          (M6811_OP_IMM8 | M6811_OP_IX | M6811_OP_IY | M6811_OP_DIRECT))
        {
          status = read_memory (memaddr + pos + offset, &buffer[0], 1, info);
          if (status != 0)
            return status;

          /* This movb/movw is special (see above).  */
          if (offset < 2)
            {
              offset = -offset;
              pc_dst_offset = 2;
            }
          else
            {
              offset = -1;
              pc_dst_offset = 5;
            }
          pos++;

          if (format & M6811_OP_IMM8)
            {
              (*info->fprintf_func) (info->stream, "#0x%x", (int) buffer[0]);
              format &= ~M6811_OP_IMM8;
              /* Set PC destination offset.  */
              pc_dst_offset = 1;
            }
          else if (format & M6811_OP_IX)
            {
              /* Offsets are in range 0..255, print them unsigned.  */
              (*info->fprintf_func) (info->stream, "0x%x,x", buffer[0] & 0x0FF);
              format &= ~M6811_OP_IX;
            }
          else if (format & M6811_OP_IY)
            {
              (*info->fprintf_func) (info->stream, "0x%x,y", buffer[0] & 0x0FF);
              format &= ~M6811_OP_IY;
            }
          else if (format & M6811_OP_DIRECT)
            {
              (*info->fprintf_func) (info->stream, "*");
              if (info->symtab_size > 0) /* Avoid duplicate 0x. */
                (*info->fprintf_func) (info->stream, "0x");
              (*info->print_address_func) (buffer[0] & 0x0FF, info);
              format &= ~M6811_OP_DIRECT;
            }
        }

#define M6812_DST_MOVE  (M6812_OP_IND16_P2 | M6812_OP_IDX_P2)
#define M6812_INDEXED_FLAGS (M6812_OP_IDX|M6812_OP_IDX_1|M6812_OP_IDX_2)
      /* Analyze the 68HC12 indexed byte.  */
      if (format & M6812_INDEXED_FLAGS)
        {
          int indirect;
          bfd_vma endaddr;

          endaddr = memaddr + pos + 1;
          if (format & M6811_OP_IND16)
            endaddr += 2;
          pc_src_offset = -1;
          pc_dst_offset = 1;
          status = print_indexed_operand (memaddr + pos, info, &indirect,
                                          (format & M6812_DST_MOVE),
                                          pc_src_offset, endaddr, arch);
          if (status < 0)
            return status;

          pos += status;

          /* The indirect addressing mode of the call instruction does
             not need the page code.  */
          if ((format & M6812_OP_PAGE) && indirect)
            format &= ~M6812_OP_PAGE;
        }

      /* 68HC12 dbcc/ibcc/tbcc operands.  */
      if ((format & M6812_OP_REG) && (format & M6811_OP_JUMP_REL))
        {
          status = read_memory (memaddr + pos, &buffer[0], 2, info);
          if (status != 0)
            return status;

          (*info->fprintf_func) (info->stream, "%s,",
                                 reg_src_table[buffer[0] & 0x07]);
          val = buffer[1] - ((buffer[0] & 0x10) << 4);

          pos += 2;
          (*info->fprintf_func) (info->stream, "0x");
          (*info->print_address_func) (memaddr + pos + val, info);
          format &= ~(M6812_OP_REG | M6811_OP_JUMP_REL);
        }
      else if (format & (M6812_OP_REG | M6812_OP_REG_2))
        {
          status = read_memory (memaddr + pos, &buffer[0], 1, info);
          if (status != 0)
            return status;

          pos++;
          (*info->fprintf_func) (info->stream, "%s,%s",
                                 reg_src_table[(buffer[0] >> 4) & 7],
                                 reg_dst_table[(buffer[0] & 7)]);
        }

      if (format & (M6811_OP_IMM16 | M6811_OP_IND16))
        {
          bfd_vma addr;
          unsigned page = 0;

          status = read_memory (memaddr + pos + offset, &buffer[0], 2, info);
          if (status != 0)
            return status;

          if (format & M6812_OP_IDX_P2)
            offset = -2;
          else
            offset = 0;
          pos += 2;

          addr = val = (buffer[0] << 8) | buffer[1];
          pc_dst_offset = 2;
          if (format & M6812_OP_PAGE)
            {
              status = read_memory (memaddr + pos + offset, buffer, 1, info);
              if (status != 0)
                return status;

              page = buffer[0];
              if (addr >= M68HC12_BANK_BASE && addr < 0x0c000)
                addr = (val - M68HC12_BANK_BASE + (page << M68HC12_BANK_SHIFT)
                        + M68HC12_BANK_VIRT);
            }
          else if ((arch & cpu6812)
                   && addr >= M68HC12_BANK_BASE && addr < 0x0c000)
            {
              unsigned cur_page;
              bfd_vma vaddr;

              if (memaddr >= M68HC12_BANK_VIRT)
                cur_page = ((memaddr - M68HC12_BANK_VIRT)
                            >> M68HC12_BANK_SHIFT);
              else
                cur_page = 0;

              vaddr = (addr - M68HC12_BANK_BASE
                       + (cur_page << M68HC12_BANK_SHIFT)) + M68HC12_BANK_VIRT;
              if (!info->symbol_at_address_func (addr, info)
                  && info->symbol_at_address_func (vaddr, info))
                addr = vaddr;
            }
          if (format & M6811_OP_IMM16)
            {
              format &= ~M6811_OP_IMM16;
              (*info->fprintf_func) (info->stream, "#");
            }
          else
            {
              format &= ~M6811_OP_IND16;
            }

          /* Avoid duplicate 0x from core binutils.  */
          if (info->symtab_size > 0)
            (*info->fprintf_func) (info->stream, "0x");

          (*info->print_address_func) (addr, info);
          if (format & M6812_OP_PAGE)
            {
              (* info->fprintf_func) (info->stream, " {");
              /* Avoid duplicate 0x from core binutils.  */
              if (info->symtab_size > 0)
                (*info->fprintf_func) (info->stream, "0x");
              (* info->print_address_func) (val, info);
              (* info->fprintf_func) (info->stream, ", 0x%x}", page);
              format &= ~M6812_OP_PAGE;
              pos += 1;
            }
        }

      if (format & M6812_OP_IDX_P2)
        {
          (*info->fprintf_func) (info->stream, ", ");
          status = print_indexed_operand (memaddr + pos + offset, info,
                                          0, 1, pc_dst_offset,
                                          memaddr + pos + offset + 1, arch);
          if (status < 0)
            return status;
          pos += status;
        }

      if (format & M6812_OP_IND16_P2)
        {
          (*info->fprintf_func) (info->stream, ", ");

          status = read_memory (memaddr + pos + offset, &buffer[0], 2, info);
          if (status != 0)
            return status;

          pos += 2;

          val = (buffer[0] << 8) | buffer[1];
          /* Avoid duplicate 0x from core binutils.  */
          if (info->symtab_size > 0)
            (*info->fprintf_func) (info->stream, "0x");
          (*info->print_address_func) (val, info);
        }

      /* M6811_OP_BITMASK and M6811_OP_JUMP_REL must be treated separately
         and in that order.  The brset/brclr insn have a bitmask and then
         a relative branch offset.  */
      if (format & M6811_OP_BITMASK)
        {
          status = read_memory (memaddr + pos, &buffer[0], 1, info);
          if (status != 0)
            return status;

          pos++;
          (*info->fprintf_func) (info->stream, ", #0x%02x%s",
                                 buffer[0] & 0x0FF,
                                 (format & M6811_OP_JUMP_REL ? ", " : ""));
          format &= ~M6811_OP_BITMASK;
        }
      if (format & M6811_OP_JUMP_REL)
        {
          status = read_memory (memaddr + pos, &buffer[0], 1, info);
          if (status != 0)
            return status;

          (*info->fprintf_func) (info->stream, "0x");
          pos++;
          val = (buffer[0] ^ 0x80) - 0x80;
          (*info->print_address_func) (memaddr + pos + val, info);
          format &= ~M6811_OP_JUMP_REL;
        }
      else if (format & M6812_OP_JUMP_REL16)
        {
          status = read_memory (memaddr + pos, &buffer[0], 2, info);
          if (status != 0)
            return status;

          pos += 2;
          val = (((buffer[0] << 8) | buffer[1]) ^ 0x8000) - 0x8000;

          (*info->fprintf_func) (info->stream, "0x");
          (*info->print_address_func) (memaddr + pos + val, info);
          format &= ~M6812_OP_JUMP_REL16;
        }

      if (format & M6812_OP_PAGE)
        {
          status = read_memory (memaddr + pos + offset, &buffer[0], 1, info);
          if (status != 0)
            return status;

          pos += 1;

          val = buffer[0];
          (*info->fprintf_func) (info->stream, ", 0x%x", (unsigned) val);
        }

#ifdef DEBUG
      /* Consistency check.  'format' must be 0, so that we have handled
         all formats; and the computed size of the insn must match the
         opcode table content.  */
      if (format & ~(M6811_OP_PAGE4 | M6811_OP_PAGE3 | M6811_OP_PAGE2))
        (*info->fprintf_func) (info->stream, "; Error, format: %lx", format);

      if (pos != opcode->size)
        (*info->fprintf_func) (info->stream, "; Error, size: %ld expect %d",
                               pos, opcode->size);
#endif
      return pos;
    }

  /* Opcode not recognized.  */
  if (format == M6811_OP_PAGE2 && arch & cpu6812
      && ((code >= 0x30 && code <= 0x39) || (code >= 0x40)))
    (*info->fprintf_func) (info->stream, "trap\t#0x%02x", code & 0x0ff);

  else if (format == M6811_OP_PAGE2)
    (*info->fprintf_func) (info->stream, ".byte\t0x%02x, 0x%02x",
                           M6811_OPCODE_PAGE2, code);
  else if (format == M6811_OP_PAGE3)
    (*info->fprintf_func) (info->stream, ".byte\t0x%02x, 0x%02x",
                           M6811_OPCODE_PAGE3, code);
  else if (format == M6811_OP_PAGE4)
    (*info->fprintf_func) (info->stream, ".byte\t0x%02x, 0x%02x",
                           M6811_OPCODE_PAGE4, code);
  else
    (*info->fprintf_func) (info->stream, ".byte\t0x%02x", code);

  return pos;
}

/* Disassemble one instruction at address 'memaddr'.  Returns the number
   of bytes used by that instruction.  */
int
print_insn_m68hc11 (bfd_vma memaddr, struct disassemble_info* info)
{
  return print_insn (memaddr, info, cpu6811);
}

int
print_insn_m68hc12 (bfd_vma memaddr, struct disassemble_info* info)
{
  return print_insn (memaddr, info, cpu6812);
}

int
print_insn_m9s12x (bfd_vma memaddr, struct disassemble_info* info)
{
  return print_insn (memaddr, info, cpu6812|cpu9s12x);
}

int
print_insn_m9s12xg (bfd_vma memaddr, struct disassemble_info* info)
{
  return print_insn (memaddr, info, cpuxgate);
}