[deliverable/binutils-gdb.git] / opcodes / pdp11-dis.c

/* Print DEC PDP-11 instructions.
   Copyright 2001, 2002 Free Software Foundation, Inc.

This file 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 "sysdep.h"
#include "dis-asm.h"
#include "opcode/pdp11.h"

#define AFTER_INSTRUCTION	"\t"
#define OPERAND_SEPARATOR	", "

#define JUMP	0x1000	/* flag that this operand is used in a jump */

#define FPRINTF	(*info->fprintf_func)
#define F	info->stream

/* sign-extend a 16-bit number in an int */
#define SIGN_BITS	(8 * sizeof (int) - 16)
#define sign_extend(x) (((x) << SIGN_BITS) >> SIGN_BITS)

static int read_word PARAMS ((bfd_vma memaddr, int *word,
			      disassemble_info *info));
static void print_signed_octal PARAMS ((int n, disassemble_info *info));
static void print_reg PARAMS ((int reg, disassemble_info *info));
static void print_freg PARAMS ((int freg, disassemble_info *info));
static int print_operand PARAMS ((bfd_vma *memaddr, int code,
				  disassemble_info *info));
static int print_foperand PARAMS ((bfd_vma *memaddr, int code,
                                   disassemble_info *info));
int print_insn_pdp11 PARAMS ((bfd_vma memaddr, disassemble_info *info));

static int
read_word (memaddr, word, info)
     bfd_vma memaddr;
     int *word;
     disassemble_info *info;
{
  int status;
  bfd_byte x[2];

  status = (*info->read_memory_func) (memaddr, x, 2, info);
  if (status != 0)
    return -1;

  *word = x[1] << 8 | x[0];
  return 0;
}

static void
print_signed_octal (n, info)
     int n;
     disassemble_info *info;
{
  if (n < 0)
    FPRINTF (F, "-%o", -n);
  else
    FPRINTF (F, "%o", n);
}

static void
print_reg (reg, info)
     int reg;
     disassemble_info *info;
{
  /* mask off the addressing mode, if any */
  reg &= 7;

  switch (reg)
    {
    case 0: case 1: case 2: case 3: case 4: case 5:
		FPRINTF (F, "r%d", reg); break;
    case 6:	FPRINTF (F, "sp"); break;
    case 7:	FPRINTF (F, "pc"); break;
    default: ;	/* error */
    }
}

static void
print_freg (freg, info)
     int freg;
     disassemble_info *info;
{
  FPRINTF (F, "fr%d", freg);
}

static int
print_operand (memaddr, code, info)
     bfd_vma *memaddr;
     int code;
     disassemble_info *info;
{
  int mode = (code >> 3) & 7;
  int reg = code & 7;
  int disp;

  switch (mode)
    {
    case 0:
      print_reg (reg, info);
      break;
    case 1:
      FPRINTF (F, "(");
      print_reg (reg, info);
      FPRINTF (F, ")");
      break;
    case 2:
      if (reg == 7)
	{
	  int data;
	  if (read_word (*memaddr, &data, info) < 0)
	    return -1;
	  FPRINTF (F, "$");
	  print_signed_octal (sign_extend (data), info);
	  *memaddr += 2;
	}
      else
	{
	  FPRINTF (F, "(");
	  print_reg (reg, info);
	  FPRINTF (F, ")+");
	}
	break;
    case 3:
      if (reg == 7)
	{
	  int address;
	  if (read_word (*memaddr, &address, info) < 0)
	    return -1;
	  FPRINTF (F, "*$%o", address);
	  *memaddr += 2;
	}
      else
	{
	  FPRINTF (F, "*(");
	  print_reg (reg, info);
	  FPRINTF (F, ")+");
	}
	break;
    case 4:
      FPRINTF (F, "-(");
      print_reg (reg, info);
      FPRINTF (F, ")");
      break;
    case 5:
      FPRINTF (F, "*-(");
      print_reg (reg, info);
      FPRINTF (F, ")");
      break;
    case 6:
    case 7:
      if (read_word (*memaddr, &disp, info) < 0)
	return -1;
      *memaddr += 2;
      if (reg == 7)
	{
	  bfd_vma address = *memaddr + sign_extend (disp);
	  if (mode == 7)
	    FPRINTF (F, "*");
	  if (!(code & JUMP))
	    FPRINTF (F, "$");
	  (*info->print_address_func) (address, info);
	}
      else
	{
	  if (mode == 7)
	    FPRINTF (F, "*");
	  print_signed_octal (sign_extend (disp), info);
	  FPRINTF (F, "(");
	  print_reg (reg, info);
	  FPRINTF (F, ")");
	}
      break;
    }

  return 0;
}

static int
print_foperand (memaddr, code, info)
     bfd_vma *memaddr;
     int code;
     disassemble_info *info;
{
  int mode = (code >> 3) & 7;
  int reg = code & 7;

  if (mode == 0)
    print_freg (reg, info);
  else
    return print_operand (memaddr, code, info);

  return 0;
}

/* Print the PDP-11 instruction at address MEMADDR in debugged memory,
   on INFO->STREAM.  Returns length of the instruction, in bytes.  */

int
print_insn_pdp11 (memaddr, info)
     bfd_vma memaddr;
     disassemble_info *info;
{
  bfd_vma start_memaddr = memaddr;
  int opcode;
  int src, dst;
  int i;

  info->bytes_per_line = 6;
  info->bytes_per_chunk = 2;
  info->display_endian = BFD_ENDIAN_LITTLE;

  if (read_word (memaddr, &opcode, info) != 0)
    return -1;
  memaddr += 2;

  src = (opcode >> 6) & 0x3f;
  dst = opcode & 0x3f;

  for (i = 0; i < pdp11_num_opcodes; i++)
    {
#define OP pdp11_opcodes[i]
      if ((opcode & OP.mask) == OP.opcode)
	switch (OP.type)
	  {
	  case PDP11_OPCODE_NO_OPS:
	    FPRINTF (F, OP.name);
	    goto done;
	  case PDP11_OPCODE_REG:
	    FPRINTF (F, OP.name);
	    FPRINTF (F, AFTER_INSTRUCTION);
	    print_reg (dst, info);
	    goto done;
	  case PDP11_OPCODE_OP:
	    FPRINTF (F, OP.name);
	    FPRINTF (F, AFTER_INSTRUCTION);
	    if (strcmp (OP.name, "jmp") == 0)
	      dst |= JUMP;
	    if (print_operand (&memaddr, dst, info) < 0)
	      return -1;
	    goto done;
	  case PDP11_OPCODE_FOP:
	    FPRINTF (F, OP.name);
	    FPRINTF (F, AFTER_INSTRUCTION);
	    if (strcmp (OP.name, "jmp") == 0)
	      dst |= JUMP;
	    if (print_foperand (&memaddr, dst, info) < 0)
	      return -1;
	    goto done;
	  case PDP11_OPCODE_REG_OP:
	    FPRINTF (F, OP.name);
	    FPRINTF (F, AFTER_INSTRUCTION);
	    print_reg (src, info);
	    FPRINTF (F, OPERAND_SEPARATOR);
	    if (strcmp (OP.name, "jsr") == 0)
	      dst |= JUMP;
	    if (print_operand (&memaddr, dst, info) < 0)
	      return -1;
	    goto done;
	  case PDP11_OPCODE_REG_OP_REV:
	    FPRINTF (F, OP.name);
	    FPRINTF (F, AFTER_INSTRUCTION);
	    if (print_operand (&memaddr, dst, info) < 0)
	      return -1;
	    FPRINTF (F, OPERAND_SEPARATOR);
	    print_reg (src, info);
	    goto done;
	  case PDP11_OPCODE_AC_FOP:
	    {
	      int ac = (opcode & 0xe0) >> 6;
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      print_freg (ac, info);
	      FPRINTF (F, OPERAND_SEPARATOR);
	      if (print_foperand (&memaddr, dst, info) < 0)
		return -1;
	      goto done;
	    }
	  case PDP11_OPCODE_FOP_AC:
	    {
	      int ac = (opcode & 0xe0) >> 6;
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      if (print_foperand (&memaddr, dst, info) < 0)
		return -1;
	      FPRINTF (F, OPERAND_SEPARATOR);
	      print_freg (ac, info);
	      goto done;
	    }
	  case PDP11_OPCODE_AC_OP:
	    {
	      int ac = (opcode & 0xe0) >> 6;
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      print_freg (ac, info);
	      FPRINTF (F, OPERAND_SEPARATOR);
	      if (print_operand (&memaddr, dst, info) < 0)
		return -1;
	      goto done;
	    }
	  case PDP11_OPCODE_OP_AC:
	    {
	      int ac = (opcode & 0xe0) >> 6;
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      if (print_operand (&memaddr, dst, info) < 0)
		return -1;
	      FPRINTF (F, OPERAND_SEPARATOR);
	      print_freg (ac, info);
	      goto done;
	    }
	  case PDP11_OPCODE_OP_OP:
	    FPRINTF (F, OP.name);
	    FPRINTF (F, AFTER_INSTRUCTION);
	    if (print_operand (&memaddr, src, info) < 0)
	      return -1;
	    FPRINTF (F, OPERAND_SEPARATOR);
	    if (print_operand (&memaddr, dst, info) < 0)
	      return -1;
	    goto done;
	  case PDP11_OPCODE_DISPL:
	    {
	      int displ = (opcode & 0xff) << 8;
	      bfd_vma address = memaddr + (sign_extend (displ) >> 7);
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      (*info->print_address_func) (address, info);
	      goto done;
	    }
	  case PDP11_OPCODE_REG_DISPL:
	    {
	      int displ = (opcode & 0x3f) << 10;
	      bfd_vma address = memaddr - (displ >> 9);

	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      print_reg (src, info);
	      FPRINTF (F, OPERAND_SEPARATOR);
	      (*info->print_address_func) (address, info);
	      goto done;
	    }
	  case PDP11_OPCODE_IMM8:
	    {
	      int code = opcode & 0xff;
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      FPRINTF (F, "%o", code);
	      goto done;
	    }
	  case PDP11_OPCODE_IMM6:
	    {
	      int code = opcode & 0x3f;
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      FPRINTF (F, "%o", code);
	      goto done;
	    }
	  case PDP11_OPCODE_IMM3:
	    {
	      int code = opcode & 7;
	      FPRINTF (F, OP.name);
	      FPRINTF (F, AFTER_INSTRUCTION);
	      FPRINTF (F, "%o", code);
	      goto done;
	    }
	  case PDP11_OPCODE_ILLEGAL:
	    {
	      FPRINTF (F, ".word");
	      FPRINTF (F, AFTER_INSTRUCTION);
	      FPRINTF (F, "%o", opcode);
	      goto done;
	    }
	  default:
	    /* TODO: is this a proper way of signalling an error? */
	    FPRINTF (F, "<internal error: unrecognized instruction type>");
	    return -1;
	  }
#undef OP
    }
 done:

  return memaddr - start_memaddr;
}
Commit	Line	Data
e135f41b	1	/* Print DEC PDP-11 instructions.
84dd1cff	2	Copyright 2001, 2002 Free Software Foundation, Inc.
e135f41b NC	3
	4	This file is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU General Public License as published by
	6	the Free Software Foundation; either version 2 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU General Public License for more details.
	13
	14	You should have received a copy of the GNU General Public License
	15	along with this program; if not, write to the Free Software
	16	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	17
fc05c67f	18	#include "sysdep.h"
e135f41b NC	19	#include "dis-asm.h"
	20	#include "opcode/pdp11.h"
	21
	22	#define AFTER_INSTRUCTION "\t"
	23	#define OPERAND_SEPARATOR ", "
	24
	25	#define JUMP 0x1000 /* flag that this operand is used in a jump */
	26
	27	#define FPRINTF (*info->fprintf_func)
	28	#define F info->stream
	29
	30	/* sign-extend a 16-bit number in an int */
	31	#define SIGN_BITS (8 * sizeof (int) - 16)
	32	#define sign_extend(x) (((x) << SIGN_BITS) >> SIGN_BITS)
	33
	34	static int read_word PARAMS ((bfd_vma memaddr, int *word,
	35	disassemble_info *info));
	36	static void print_signed_octal PARAMS ((int n, disassemble_info *info));
	37	static void print_reg PARAMS ((int reg, disassemble_info *info));
	38	static void print_freg PARAMS ((int freg, disassemble_info *info));
	39	static int print_operand PARAMS ((bfd_vma *memaddr, int code,
	40	disassemble_info *info));
84dd1cff AM	41	static int print_foperand PARAMS ((bfd_vma *memaddr, int code,
84dd1cff AM	42	disassemble_info *info));
e135f41b NC	43	int print_insn_pdp11 PARAMS ((bfd_vma memaddr, disassemble_info *info));
	44
	45	static int
	46	read_word (memaddr, word, info)
	47	bfd_vma memaddr;
	48	int *word;
	49	disassemble_info *info;
	50	{
	51	int status;
	52	bfd_byte x[2];
	53
	54	status = (*info->read_memory_func) (memaddr, x, 2, info);
	55	if (status != 0)
	56	return -1;
	57
	58	*word = x[1] << 8 \| x[0];
	59	return 0;
	60	}
	61
	62	static void
	63	print_signed_octal (n, info)
	64	int n;
	65	disassemble_info *info;
	66	{
	67	if (n < 0)
	68	FPRINTF (F, "-%o", -n);
	69	else
	70	FPRINTF (F, "%o", n);
	71	}
	72
	73	static void
	74	print_reg (reg, info)
	75	int reg;
	76	disassemble_info *info;
	77	{
	78	/* mask off the addressing mode, if any */
	79	reg &= 7;
	80
	81	switch (reg)
	82	{
	83	case 0: case 1: case 2: case 3: case 4: case 5:
	84	FPRINTF (F, "r%d", reg); break;
	85	case 6: FPRINTF (F, "sp"); break;
	86	case 7: FPRINTF (F, "pc"); break;
6a51a8a8	87	default: ; /* error */
e135f41b NC	88	}
	89	}
	90
	91	static void
	92	print_freg (freg, info)
	93	int freg;
	94	disassemble_info *info;
	95	{
	96	FPRINTF (F, "fr%d", freg);
	97	}
	98
	99	static int
	100	print_operand (memaddr, code, info)
	101	bfd_vma *memaddr;
	102	int code;
	103	disassemble_info *info;
	104	{
	105	int mode = (code >> 3) & 7;
	106	int reg = code & 7;
	107	int disp;
	108
	109	switch (mode)
	110	{
	111	case 0:
	112	print_reg (reg, info);
	113	break;
	114	case 1:
	115	FPRINTF (F, "(");
	116	print_reg (reg, info);
	117	FPRINTF (F, ")");
	118	break;
	119	case 2:
	120	if (reg == 7)
	121	{
	122	int data;
	123	if (read_word (*memaddr, &data, info) < 0)
	124	return -1;
	125	FPRINTF (F, "$");
	126	print_signed_octal (sign_extend (data), info);
	127	*memaddr += 2;
	128	}
	129	else
	130	{
	131	FPRINTF (F, "(");
	132	print_reg (reg, info);
	133	FPRINTF (F, ")+");
	134	}
	135	break;
	136	case 3:
	137	if (reg == 7)
	138	{
	139	int address;
	140	if (read_word (*memaddr, &address, info) < 0)
	141	return -1;
	142	FPRINTF (F, "*$%o", address);
	143	*memaddr += 2;
	144	}
	145	else
	146	{
	147	FPRINTF (F, "*(");
	148	print_reg (reg, info);
	149	FPRINTF (F, ")+");
	150	}
	151	break;
152	case 4:
153	FPRINTF (F, "-(");
154	print_reg (reg, info);
155	FPRINTF (F, ")");
156	break;
157	case 5:
158	FPRINTF (F, "*-(");
159	print_reg (reg, info);
160	FPRINTF (F, ")");
161	break;
162	case 6:
163	case 7:
164	if (read_word (*memaddr, &disp, info) < 0)
165	return -1;
166	*memaddr += 2;
167	if (reg == 7)
168	{
169	bfd_vma address = *memaddr + sign_extend (disp);
84dd1cff AM	170	if (mode == 7)
84dd1cff AM	171	FPRINTF (F, "*");
e135f41b	172	if (!(code & JUMP))
84dd1cff	173	FPRINTF (F, "$");
e135f41b NC	174	(*info->print_address_func) (address, info);
	175	}
	176	else
	177	{
	178	if (mode == 7)
	179	FPRINTF (F, "*");
	180	print_signed_octal (sign_extend (disp), info);
	181	FPRINTF (F, "(");
	182	print_reg (reg, info);
	183	FPRINTF (F, ")");
	184	}
	185	break;
	186	}
	187
	188	return 0;
	189	}
	190
84dd1cff AM	191	static int
	192	print_foperand (memaddr, code, info)
	193	bfd_vma *memaddr;
	194	int code;
	195	disassemble_info *info;
	196	{
	197	int mode = (code >> 3) & 7;
	198	int reg = code & 7;
	199
	200	if (mode == 0)
	201	print_freg (reg, info);
	202	else
	203	return print_operand (memaddr, code, info);
	204
	205	return 0;
	206	}
	207
e135f41b NC	208	/* Print the PDP-11 instruction at address MEMADDR in debugged memory,
	209	on INFO->STREAM. Returns length of the instruction, in bytes. */
	210
	211	int
	212	print_insn_pdp11 (memaddr, info)
	213	bfd_vma memaddr;
	214	disassemble_info *info;
	215	{
	216	bfd_vma start_memaddr = memaddr;
	217	int opcode;
	218	int src, dst;
	219	int i;
	220
	221	info->bytes_per_line = 6;
	222	info->bytes_per_chunk = 2;
	223	info->display_endian = BFD_ENDIAN_LITTLE;
	224
	225	if (read_word (memaddr, &opcode, info) != 0)
	226	return -1;
	227	memaddr += 2;
	228
	229	src = (opcode >> 6) & 0x3f;
	230	dst = opcode & 0x3f;
	231
	232	for (i = 0; i < pdp11_num_opcodes; i++)
	233	{
	234	#define OP pdp11_opcodes[i]
	235	if ((opcode & OP.mask) == OP.opcode)
	236	switch (OP.type)
	237	{
	238	case PDP11_OPCODE_NO_OPS:
	239	FPRINTF (F, OP.name);
c6843df5	240	goto done;
e135f41b NC	241	case PDP11_OPCODE_REG:
	242	FPRINTF (F, OP.name);
	243	FPRINTF (F, AFTER_INSTRUCTION);
	244	print_reg (dst, info);
c6843df5	245	goto done;
e135f41b NC	246	case PDP11_OPCODE_OP:
	247	FPRINTF (F, OP.name);
	248	FPRINTF (F, AFTER_INSTRUCTION);
	249	if (strcmp (OP.name, "jmp") == 0)
	250	dst \|= JUMP;
	251	if (print_operand (&memaddr, dst, info) < 0)
	252	return -1;
c6843df5	253	goto done;
84dd1cff AM	254	case PDP11_OPCODE_FOP:
	255	FPRINTF (F, OP.name);
	256	FPRINTF (F, AFTER_INSTRUCTION);
	257	if (strcmp (OP.name, "jmp") == 0)
	258	dst \|= JUMP;
	259	if (print_foperand (&memaddr, dst, info) < 0)
	260	return -1;
	261	goto done;
e135f41b NC	262	case PDP11_OPCODE_REG_OP:
	263	FPRINTF (F, OP.name);
	264	FPRINTF (F, AFTER_INSTRUCTION);
	265	print_reg (src, info);
	266	FPRINTF (F, OPERAND_SEPARATOR);
	267	if (strcmp (OP.name, "jsr") == 0)
	268	dst \|= JUMP;
	269	if (print_operand (&memaddr, dst, info) < 0)
	270	return -1;
c6843df5	271	goto done;
e135f41b NC	272	case PDP11_OPCODE_REG_OP_REV:
	273	FPRINTF (F, OP.name);
	274	FPRINTF (F, AFTER_INSTRUCTION);
	275	if (print_operand (&memaddr, dst, info) < 0)
	276	return -1;
	277	FPRINTF (F, OPERAND_SEPARATOR);
	278	print_reg (src, info);
c6843df5	279	goto done;
84dd1cff AM	280	case PDP11_OPCODE_AC_FOP:
	281	{
	282	int ac = (opcode & 0xe0) >> 6;
	283	FPRINTF (F, OP.name);
	284	FPRINTF (F, AFTER_INSTRUCTION);
	285	print_freg (ac, info);
	286	FPRINTF (F, OPERAND_SEPARATOR);
	287	if (print_foperand (&memaddr, dst, info) < 0)
	288	return -1;
	289	goto done;
	290	}
	291	case PDP11_OPCODE_FOP_AC:
	292	{
	293	int ac = (opcode & 0xe0) >> 6;
	294	FPRINTF (F, OP.name);
	295	FPRINTF (F, AFTER_INSTRUCTION);
	296	if (print_foperand (&memaddr, dst, info) < 0)
	297	return -1;
	298	FPRINTF (F, OPERAND_SEPARATOR);
	299	print_freg (ac, info);
	300	goto done;
	301	}
e135f41b NC	302	case PDP11_OPCODE_AC_OP:
	303	{
	304	int ac = (opcode & 0xe0) >> 6;
	305	FPRINTF (F, OP.name);
	306	FPRINTF (F, AFTER_INSTRUCTION);
	307	print_freg (ac, info);
	308	FPRINTF (F, OPERAND_SEPARATOR);
	309	if (print_operand (&memaddr, dst, info) < 0)
	310	return -1;
c6843df5	311	goto done;
e135f41b	312	}
84dd1cff AM	313	case PDP11_OPCODE_OP_AC:
	314	{
	315	int ac = (opcode & 0xe0) >> 6;
	316	FPRINTF (F, OP.name);
	317	FPRINTF (F, AFTER_INSTRUCTION);
	318	if (print_operand (&memaddr, dst, info) < 0)
	319	return -1;
	320	FPRINTF (F, OPERAND_SEPARATOR);
	321	print_freg (ac, info);
	322	goto done;
	323	}
e135f41b NC	324	case PDP11_OPCODE_OP_OP:
	325	FPRINTF (F, OP.name);
	326	FPRINTF (F, AFTER_INSTRUCTION);
	327	if (print_operand (&memaddr, src, info) < 0)
	328	return -1;
	329	FPRINTF (F, OPERAND_SEPARATOR);
	330	if (print_operand (&memaddr, dst, info) < 0)
	331	return -1;
c6843df5	332	goto done;
e135f41b NC	333	case PDP11_OPCODE_DISPL:
	334	{
	335	int displ = (opcode & 0xff) << 8;
	336	bfd_vma address = memaddr + (sign_extend (displ) >> 7);
	337	FPRINTF (F, OP.name);
	338	FPRINTF (F, AFTER_INSTRUCTION);
	339	(*info->print_address_func) (address, info);
c6843df5	340	goto done;
e135f41b NC	341	}
	342	case PDP11_OPCODE_REG_DISPL:
	343	{
	344	int displ = (opcode & 0x3f) << 10;
14127cc4 NC	345	bfd_vma address = memaddr - (displ >> 9);
14127cc4 NC	346
e135f41b NC	347	FPRINTF (F, OP.name);
	348	FPRINTF (F, AFTER_INSTRUCTION);
	349	print_reg (src, info);
	350	FPRINTF (F, OPERAND_SEPARATOR);
	351	(*info->print_address_func) (address, info);
c6843df5	352	goto done;
e135f41b NC	353	}
	354	case PDP11_OPCODE_IMM8:
	355	{
	356	int code = opcode & 0xff;
	357	FPRINTF (F, OP.name);
	358	FPRINTF (F, AFTER_INSTRUCTION);
	359	FPRINTF (F, "%o", code);
c6843df5	360	goto done;
e135f41b NC	361	}
	362	case PDP11_OPCODE_IMM6:
	363	{
	364	int code = opcode & 0x3f;
	365	FPRINTF (F, OP.name);
	366	FPRINTF (F, AFTER_INSTRUCTION);
	367	FPRINTF (F, "%o", code);
c6843df5	368	goto done;
e135f41b NC	369	}
	370	case PDP11_OPCODE_IMM3:
	371	{
	372	int code = opcode & 7;
	373	FPRINTF (F, OP.name);
	374	FPRINTF (F, AFTER_INSTRUCTION);
	375	FPRINTF (F, "%o", code);
c6843df5 AM	376	goto done;
	377	}
	378	case PDP11_OPCODE_ILLEGAL:
	379	{
	380	FPRINTF (F, ".word");
	381	FPRINTF (F, AFTER_INSTRUCTION);
	382	FPRINTF (F, "%o", opcode);
	383	goto done;
e135f41b NC	384	}
	385	default:
	386	/* TODO: is this a proper way of signalling an error? */
	387	FPRINTF (F, "<internal error: unrecognized instruction type>");
	388	return -1;
	389	}
	390	#undef OP
	391	}
c6843df5	392	done:
e135f41b NC	393
	394	return memaddr - start_memaddr;
	395	}