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

/* mmix-dis.c -- Disassemble MMIX instructions.
   Copyright 2000, 2001, 2002, 2005, 2007 Free Software Foundation, Inc.
   Written by Hans-Peter Nilsson (hp@bitrange.com)

   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 file; see the file COPYING.  If not, write to the Free
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "opcode/mmix.h"
#include "dis-asm.h"
#include "libiberty.h"
#include "bfd.h"
#include "opintl.h"

#define BAD_CASE(x)				\
 do						\
   {						\
     fprintf (stderr,				\
	      _("Bad case %d (%s) in %s:%d\n"),	\
	      x, #x, __FILE__, __LINE__);	\
     abort ();					\
   }						\
 while (0)

#define FATAL_DEBUG							\
 do									\
   {									\
     fprintf (stderr,							\
	      _("Internal: Non-debugged code (test-case missing): %s:%d"),\
	      __FILE__, __LINE__);					\
     abort ();								\
   }									\
 while (0)

#define ROUND_MODE(n)					\
 ((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" :	\
  (n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" :	\
  _("(unknown)"))

#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
#define INSN_BACKWARD_OFFSET_BIT (1 << 24)

struct mmix_dis_info
 {
   const char *reg_name[256];
   const char *spec_reg_name[32];

   /* Waste a little memory so we don't have to allocate each separately.
      We could have an array with static contents for these, but on the
      other hand, we don't have to.  */
   char basic_reg_name[256][sizeof ("$255")];
 };

/* Initialize a target-specific array in INFO.  */

static bfd_boolean
initialize_mmix_dis_info (struct disassemble_info *info)
{
  struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
  long i;

  if (minfop == NULL)
    return FALSE;

  memset (minfop, 0, sizeof (*minfop));

  /* Initialize register names from register symbols.  If there's no
     register section, then there are no register symbols.  */
  if ((info->section != NULL && info->section->owner != NULL)
      || (info->symbols != NULL
	  && info->symbols[0] != NULL
	  && bfd_asymbol_bfd (info->symbols[0]) != NULL))
    {
      bfd *abfd = info->section && info->section->owner != NULL
	? info->section->owner
	: bfd_asymbol_bfd (info->symbols[0]);
      asection *reg_section = bfd_get_section_by_name (abfd, "*REG*");

      if (reg_section != NULL)
	{
	  /* The returned symcount *does* include the ending NULL.  */
	  long symsize = bfd_get_symtab_upper_bound (abfd);
	  asymbol **syms = malloc (symsize);
	  long nsyms;

	  if (syms == NULL)
	    {
	      FATAL_DEBUG;
	      free (minfop);
	      return FALSE;
	    }
	  nsyms = bfd_canonicalize_symtab (abfd, syms);

	  /* We use the first name for a register.  If this is MMO, then
	     it's the name with the first sequence number, presumably the
	     first in the source.  */
	  for (i = 0; i < nsyms && syms[i] != NULL; i++)
	    {
	      if (syms[i]->section == reg_section
		  && syms[i]->value < 256
		  && minfop->reg_name[syms[i]->value] == NULL)
		minfop->reg_name[syms[i]->value] = syms[i]->name;
	    }
	}
    }

  /* Fill in the rest with the canonical names.  */
  for (i = 0; i < 256; i++)
    if (minfop->reg_name[i] == NULL)
      {
	sprintf (minfop->basic_reg_name[i], "$%ld", i);
	minfop->reg_name[i] = minfop->basic_reg_name[i];
      }

  /* We assume it's actually a one-to-one mapping of number-to-name.  */
  for (i = 0; mmix_spec_regs[i].name != NULL; i++)
    minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;

  info->private_data = (void *) minfop;
  return TRUE;
}

/* A table indexed by the first byte is constructed as we disassemble each
   tetrabyte.  The contents is a pointer into mmix_insns reflecting the
   first found entry with matching match-bits and lose-bits.  Further
   entries are considered one after one until the operand constraints
   match or the match-bits and lose-bits do not match.  Normally a
   "further entry" will just show that there was no other match.  */

static const struct mmix_opcode *
get_opcode (unsigned long insn)
{
  static const struct mmix_opcode **opcodes = NULL;
  const struct mmix_opcode *opcodep = mmix_opcodes;
  unsigned int opcode_part = (insn >> 24) & 255;

  if (opcodes == NULL)
    opcodes = xcalloc (256, sizeof (struct mmix_opcode *));

  opcodep = opcodes[opcode_part];
  if (opcodep == NULL
      || (opcodep->match & insn) != opcodep->match
      || (opcodep->lose & insn) != 0)
    {
      /* Search through the table.  */
      for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
	{
	  /* FIXME: Break out this into an initialization function.  */
	  if ((opcodep->match & (opcode_part << 24)) == opcode_part
	      && (opcodep->lose & (opcode_part << 24)) == 0)
	    opcodes[opcode_part] = opcodep;

	  if ((opcodep->match & insn) == opcodep->match
	      && (opcodep->lose & insn) == 0)
	    break;
	}
    }

  if (opcodep->name == NULL)
    return NULL;

  /* Check constraints.  If they don't match, loop through the next opcode
     entries.  */
  do
    {
      switch (opcodep->operands)
	{
	  /* These have no restraint on what can be in the lower three
	     bytes.  */
	case mmix_operands_regs:
	case mmix_operands_reg_yz:
	case mmix_operands_regs_z_opt:
	case mmix_operands_regs_z:
	case mmix_operands_jmp:
	case mmix_operands_pushgo:
	case mmix_operands_pop:
	case mmix_operands_sync:
	case mmix_operands_x_regs_z:
	case mmix_operands_neg:
	case mmix_operands_pushj:
	case mmix_operands_regaddr:
	case mmix_operands_get:
	case mmix_operands_set:
	case mmix_operands_save:
	case mmix_operands_unsave:
	case mmix_operands_xyz_opt:
	  return opcodep;

	  /* For a ROUND_MODE, the middle byte must be 0..4.  */
	case mmix_operands_roundregs_z:
	case mmix_operands_roundregs:
	  {
	    int midbyte = (insn >> 8) & 255;

	    if (midbyte <= 4)
	      return opcodep;
	  }
	break;

	case mmix_operands_put:
	  /* A "PUT".  If it is "immediate", then no restrictions,
	     otherwise we have to make sure the register number is < 32.  */
	  if ((insn & INSN_IMMEDIATE_BIT)
	      || ((insn >> 16) & 255) < 32)
	    return opcodep;
	  break;

	case mmix_operands_resume:
	  /* Middle bytes must be zero.  */
	  if ((insn & 0x00ffff00) == 0)
	    return opcodep;
	  break;

	default:
	  BAD_CASE (opcodep->operands);
	}

      opcodep++;
    }
  while ((opcodep->match & insn) == opcodep->match
	 && (opcodep->lose & insn) == 0);

  /* If we got here, we had no match.  */
  return NULL;
}

/* The main disassembly function.  */

int
print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
{
  unsigned char buffer[4];
  unsigned long insn;
  unsigned int x, y, z;
  const struct mmix_opcode *opcodep;
  int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
  struct mmix_dis_info *minfop;

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

  /* FIXME: Is -1 suitable?  */
  if (info->private_data == NULL
      && ! initialize_mmix_dis_info (info))
    return -1;

  minfop = (struct mmix_dis_info *) info->private_data;
  x = buffer[1];
  y = buffer[2];
  z = buffer[3];

  insn = bfd_getb32 (buffer);

  opcodep = get_opcode (insn);

  if (opcodep == NULL)
    {
      (*info->fprintf_func) (info->stream, _("*unknown*"));
      return 4;
    }

  (*info->fprintf_func) (info->stream, "%s ", opcodep->name);

  /* Present bytes in the order they are laid out in memory.  */
  info->display_endian = BFD_ENDIAN_BIG;

  info->insn_info_valid = 1;
  info->bytes_per_chunk = 4;
  info->branch_delay_insns = 0;
  info->target = 0;
  switch (opcodep->type)
    {
    case mmix_type_normal:
    case mmix_type_memaccess_block:
      info->insn_type = dis_nonbranch;
      break;

    case mmix_type_branch:
      info->insn_type = dis_branch;
      break;

    case mmix_type_condbranch:
      info->insn_type = dis_condbranch;
      break;

    case mmix_type_memaccess_octa:
      info->insn_type = dis_dref;
      info->data_size = 8;
      break;

    case mmix_type_memaccess_tetra:
      info->insn_type = dis_dref;
      info->data_size = 4;
      break;

    case mmix_type_memaccess_wyde:
      info->insn_type = dis_dref;
      info->data_size = 2;
      break;

    case mmix_type_memaccess_byte:
      info->insn_type = dis_dref;
      info->data_size = 1;
      break;

    case mmix_type_jsr:
      info->insn_type = dis_jsr;
      break;

    default:
      BAD_CASE(opcodep->type);
    }

  switch (opcodep->operands)
    {
    case mmix_operands_regs:
      /*  All registers: "$X,$Y,$Z".  */
      (*info->fprintf_func) (info->stream, "%s,%s,%s",
			     minfop->reg_name[x],
			     minfop->reg_name[y],
			     minfop->reg_name[z]);
      break;

    case mmix_operands_reg_yz:
      /* Like SETH - "$X,YZ".  */
      (*info->fprintf_func) (info->stream, "%s,0x%x",
			     minfop->reg_name[x], y * 256 + z);
      break;

    case mmix_operands_regs_z_opt:
    case mmix_operands_regs_z:
    case mmix_operands_pushgo:
      /* The regular "$X,$Y,$Z|Z".  */
      if (insn & INSN_IMMEDIATE_BIT)
	(*info->fprintf_func) (info->stream, "%s,%s,%d",
			       minfop->reg_name[x], minfop->reg_name[y], z);
      else
	(*info->fprintf_func) (info->stream, "%s,%s,%s",
			       minfop->reg_name[x],
			       minfop->reg_name[y],
			       minfop->reg_name[z]);
      break;

    case mmix_operands_jmp:
      /* Address; only JMP.  */
      {
	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;

	if (insn & INSN_BACKWARD_OFFSET_BIT)
	  offset -= (256 * 65536) * 4;

	info->target = memaddr + offset;
	(*info->print_address_func) (memaddr + offset, info);
      }
      break;

    case mmix_operands_roundregs_z:
      /* Two registers, like FLOT, possibly with rounding: "$X,$Z|Z"
	 "$X,ROUND_MODE,$Z|Z".  */
      if (y != 0)
	{
	  if (insn & INSN_IMMEDIATE_BIT)
	    (*info->fprintf_func) (info->stream, "%s,%s,%d",
				   minfop->reg_name[x],
				   ROUND_MODE (y), z);
	  else
	    (*info->fprintf_func) (info->stream, "%s,%s,%s",
				   minfop->reg_name[x],
				   ROUND_MODE (y),
				   minfop->reg_name[z]);
	}
      else
	{
	  if (insn & INSN_IMMEDIATE_BIT)
	    (*info->fprintf_func) (info->stream, "%s,%d",
				   minfop->reg_name[x], z);
	  else
	    (*info->fprintf_func) (info->stream, "%s,%s",
				   minfop->reg_name[x],
				   minfop->reg_name[z]);
	}
      break;

    case mmix_operands_pop:
      /* Like POP - "X,YZ".  */
      (*info->fprintf_func) (info->stream, "%d,%d", x, y*256 + z);
      break;

    case mmix_operands_roundregs:
      /* Two registers, possibly with rounding: "$X,$Z" or
	 "$X,ROUND_MODE,$Z".  */
      if (y != 0)
	(*info->fprintf_func) (info->stream, "%s,%s,%s",
			       minfop->reg_name[x],
			       ROUND_MODE (y),
			       minfop->reg_name[z]);
      else
	(*info->fprintf_func) (info->stream, "%s,%s",
			       minfop->reg_name[x],
			       minfop->reg_name[z]);
      break;

    case mmix_operands_sync:
	/* Like SYNC - "XYZ".  */
      (*info->fprintf_func) (info->stream, "%u",
			     x * 65536 + y * 256 + z);
      break;

    case mmix_operands_x_regs_z:
      /* Like SYNCD - "X,$Y,$Z|Z".  */
      if (insn & INSN_IMMEDIATE_BIT)
	(*info->fprintf_func) (info->stream, "%d,%s,%d",
			       x, minfop->reg_name[y], z);
      else
	(*info->fprintf_func) (info->stream, "%d,%s,%s",
			       x, minfop->reg_name[y],
			       minfop->reg_name[z]);
      break;

    case mmix_operands_neg:
      /* Like NEG and NEGU - "$X,Y,$Z|Z".  */
      if (insn & INSN_IMMEDIATE_BIT)
	(*info->fprintf_func) (info->stream, "%s,%d,%d",
			       minfop->reg_name[x], y, z);
      else
	(*info->fprintf_func) (info->stream, "%s,%d,%s",
			       minfop->reg_name[x], y,
			       minfop->reg_name[z]);
      break;

    case mmix_operands_pushj:
    case mmix_operands_regaddr:
      /* Like GETA or branches - "$X,Address".  */
      {
	bfd_signed_vma offset = (y * 256 + z) * 4;

	if (insn & INSN_BACKWARD_OFFSET_BIT)
	  offset -= 65536 * 4;

	info->target = memaddr + offset;

	(*info->fprintf_func) (info->stream, "%s,", minfop->reg_name[x]);
	(*info->print_address_func) (memaddr + offset, info);
      }
      break;

    case mmix_operands_get:
      /* GET - "X,spec_reg".  */
      (*info->fprintf_func) (info->stream, "%s,%s",
			     minfop->reg_name[x],
			     minfop->spec_reg_name[z]);
      break;

    case mmix_operands_put:
      /* PUT - "spec_reg,$Z|Z".  */
      if (insn & INSN_IMMEDIATE_BIT)
	(*info->fprintf_func) (info->stream, "%s,%d",
			       minfop->spec_reg_name[x], z);
      else
	(*info->fprintf_func) (info->stream, "%s,%s",
			       minfop->spec_reg_name[x],
			       minfop->reg_name[z]);
      break;

    case mmix_operands_set:
      /*  Two registers, "$X,$Y".  */
      (*info->fprintf_func) (info->stream, "%s,%s",
			     minfop->reg_name[x],
			     minfop->reg_name[y]);
      break;

    case mmix_operands_save:
      /* SAVE - "$X,0".  */
      (*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
      break;

    case mmix_operands_unsave:
      /* UNSAVE - "0,$Z".  */
      (*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
      break;

    case mmix_operands_xyz_opt:
      /* Like SWYM or TRAP - "X,Y,Z".  */
      (*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
      break;

    case mmix_operands_resume:
      /* Just "Z", like RESUME.  */
      (*info->fprintf_func) (info->stream, "%d", z);
      break;

    default:
      (*info->fprintf_func) (info->stream, _("*unknown operands type: %d*"),
			     opcodep->operands);
      break;
    }

  return 4;
}
Commit	Line	Data
afd30973	1	/* mmix-dis.c -- Disassemble MMIX instructions.
aa820537	2	Copyright 2000, 2001, 2002, 2005, 2007 Free Software Foundation, Inc.
afd30973 HPN	3	Written by Hans-Peter Nilsson (hp@bitrange.com)
afd30973 HPN	4
9b201bb5	5	This file is part of the GNU opcodes library.
afd30973	6
9b201bb5 NC	7	This library is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3, or (at your option)
	10	any later version.
afd30973	11
9b201bb5 NC	12	It is distributed in the hope that it will be useful, but WITHOUT
	13	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	14	or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
	15	License for more details.
afd30973	16
47b0e7ad NC	17	You should have received a copy of the GNU General Public License
	18	along with this file; see the file COPYING. If not, write to the Free
	19	Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
	20	MA 02110-1301, USA. */
afd30973 HPN	21
	22	#include <stdio.h>
	23	#include <string.h>
	24	#include <stdlib.h>
	25	#include "opcode/mmix.h"
	26	#include "dis-asm.h"
	27	#include "libiberty.h"
	28	#include "bfd.h"
	29	#include "opintl.h"
	30
	31	#define BAD_CASE(x) \
	32	do \
	33	{ \
	34	fprintf (stderr, \
	35	_("Bad case %d (%s) in %s:%d\n"), \
	36	x, #x, __FILE__, __LINE__); \
	37	abort (); \
	38	} \
	39	while (0)
	40
47b0e7ad NC	41	#define FATAL_DEBUG \
	42	do \
	43	{ \
	44	fprintf (stderr, \
	45	_("Internal: Non-debugged code (test-case missing): %s:%d"),\
	46	__FILE__, __LINE__); \
	47	abort (); \
	48	} \
afd30973 HPN	49	while (0)
	50
	51	#define ROUND_MODE(n) \
	52	((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \
	53	(n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \
	54	_("(unknown)"))
	55
	56	#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
	57	#define INSN_BACKWARD_OFFSET_BIT (1 << 24)
	58
	59	struct mmix_dis_info
	60	{
	61	const char *reg_name[256];
	62	const char *spec_reg_name[32];
	63
	64	/* Waste a little memory so we don't have to allocate each separately.
	65	We could have an array with static contents for these, but on the
	66	other hand, we don't have to. */
	67	char basic_reg_name[256][sizeof ("$255")];
	68	};
	69
afd30973 HPN	70	/* Initialize a target-specific array in INFO. */
afd30973 HPN	71
b34976b6	72	static bfd_boolean
47b0e7ad	73	initialize_mmix_dis_info (struct disassemble_info *info)
afd30973 HPN	74	{
afd30973 HPN	75	struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
91d6fa6a	76	long i;
afd30973 HPN	77
afd30973 HPN	78	if (minfop == NULL)
b34976b6	79	return FALSE;
afd30973 HPN	80
	81	memset (minfop, 0, sizeof (*minfop));
	82
	83	/* Initialize register names from register symbols. If there's no
	84	register section, then there are no register symbols. */
	85	if ((info->section != NULL && info->section->owner != NULL)
	86	\|\| (info->symbols != NULL
	87	&& info->symbols[0] != NULL
	88	&& bfd_asymbol_bfd (info->symbols[0]) != NULL))
	89	{
	90	bfd *abfd = info->section && info->section->owner != NULL
	91	? info->section->owner
	92	: bfd_asymbol_bfd (info->symbols[0]);
	93	asection reg_section = bfd_get_section_by_name (abfd, "REG*");
	94
	95	if (reg_section != NULL)
	96	{
	97	/* The returned symcount does include the ending NULL. */
	98	long symsize = bfd_get_symtab_upper_bound (abfd);
	99	asymbol **syms = malloc (symsize);
	100	long nsyms;
afd30973 HPN	101
afd30973 HPN	102	if (syms == NULL)
47b0e7ad NC	103	{
47b0e7ad NC	104	FATAL_DEBUG;
afd30973	105	free (minfop);
b34976b6	106	return FALSE;
afd30973 HPN	107	}
	108	nsyms = bfd_canonicalize_symtab (abfd, syms);
	109
	110	/* We use the first name for a register. If this is MMO, then
	111	it's the name with the first sequence number, presumably the
	112	first in the source. */
	113	for (i = 0; i < nsyms && syms[i] != NULL; i++)
	114	{
	115	if (syms[i]->section == reg_section
	116	&& syms[i]->value < 256
	117	&& minfop->reg_name[syms[i]->value] == NULL)
	118	minfop->reg_name[syms[i]->value] = syms[i]->name;
	119	}
	120	}
	121	}
	122
	123	/* Fill in the rest with the canonical names. */
	124	for (i = 0; i < 256; i++)
	125	if (minfop->reg_name[i] == NULL)
	126	{
91d6fa6a	127	sprintf (minfop->basic_reg_name[i], "$%ld", i);
afd30973 HPN	128	minfop->reg_name[i] = minfop->basic_reg_name[i];
	129	}
	130
	131	/* We assume it's actually a one-to-one mapping of number-to-name. */
	132	for (i = 0; mmix_spec_regs[i].name != NULL; i++)
	133	minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;
	134
47b0e7ad	135	info->private_data = (void *) minfop;
b34976b6	136	return TRUE;
afd30973 HPN	137	}
	138
	139	/* A table indexed by the first byte is constructed as we disassemble each
	140	tetrabyte. The contents is a pointer into mmix_insns reflecting the
	141	first found entry with matching match-bits and lose-bits. Further
	142	entries are considered one after one until the operand constraints
	143	match or the match-bits and lose-bits do not match. Normally a
	144	"further entry" will just show that there was no other match. */
	145
	146	static const struct mmix_opcode *
47b0e7ad	147	get_opcode (unsigned long insn)
afd30973 HPN	148	{
	149	static const struct mmix_opcode **opcodes = NULL;
	150	const struct mmix_opcode *opcodep = mmix_opcodes;
	151	unsigned int opcode_part = (insn >> 24) & 255;
47b0e7ad	152
afd30973 HPN	153	if (opcodes == NULL)
	154	opcodes = xcalloc (256, sizeof (struct mmix_opcode *));
	155
	156	opcodep = opcodes[opcode_part];
	157	if (opcodep == NULL
	158	\|\| (opcodep->match & insn) != opcodep->match
	159	\|\| (opcodep->lose & insn) != 0)
	160	{
	161	/* Search through the table. */
	162	for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
	163	{
	164	/* FIXME: Break out this into an initialization function. */
	165	if ((opcodep->match & (opcode_part << 24)) == opcode_part
	166	&& (opcodep->lose & (opcode_part << 24)) == 0)
	167	opcodes[opcode_part] = opcodep;
	168
	169	if ((opcodep->match & insn) == opcodep->match
	170	&& (opcodep->lose & insn) == 0)
	171	break;
	172	}
	173	}
	174
	175	if (opcodep->name == NULL)
	176	return NULL;
	177
	178	/* Check constraints. If they don't match, loop through the next opcode
	179	entries. */
	180	do
	181	{
	182	switch (opcodep->operands)
	183	{
	184	/* These have no restraint on what can be in the lower three
	185	bytes. */
	186	case mmix_operands_regs:
	187	case mmix_operands_reg_yz:
	188	case mmix_operands_regs_z_opt:
	189	case mmix_operands_regs_z:
	190	case mmix_operands_jmp:
	191	case mmix_operands_pushgo:
	192	case mmix_operands_pop:
	193	case mmix_operands_sync:
	194	case mmix_operands_x_regs_z:
	195	case mmix_operands_neg:
	196	case mmix_operands_pushj:
	197	case mmix_operands_regaddr:
	198	case mmix_operands_get:
	199	case mmix_operands_set:
	200	case mmix_operands_save:
	201	case mmix_operands_unsave:
	202	case mmix_operands_xyz_opt:
	203	return opcodep;
	204
	205	/* For a ROUND_MODE, the middle byte must be 0..4. */
	206	case mmix_operands_roundregs_z:
	207	case mmix_operands_roundregs:
	208	{
	209	int midbyte = (insn >> 8) & 255;
47b0e7ad	210
afd30973 HPN	211	if (midbyte <= 4)
	212	return opcodep;
	213	}
	214	break;
	215
	216	case mmix_operands_put:
	217	/* A "PUT". If it is "immediate", then no restrictions,
	218	otherwise we have to make sure the register number is < 32. */
	219	if ((insn & INSN_IMMEDIATE_BIT)
	220	\|\| ((insn >> 16) & 255) < 32)
	221	return opcodep;
	222	break;
	223
	224	case mmix_operands_resume:
	225	/* Middle bytes must be zero. */
	226	if ((insn & 0x00ffff00) == 0)
	227	return opcodep;
	228	break;
	229
	230	default:
	231	BAD_CASE (opcodep->operands);
	232	}
	233
	234	opcodep++;
	235	}
	236	while ((opcodep->match & insn) == opcodep->match
	237	&& (opcodep->lose & insn) == 0);
	238
	239	/* If we got here, we had no match. */
	240	return NULL;
	241	}
	242
	243	/* The main disassembly function. */
	244
	245	int
47b0e7ad	246	print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
afd30973 HPN	247	{
	248	unsigned char buffer[4];
	249	unsigned long insn;
	250	unsigned int x, y, z;
	251	const struct mmix_opcode *opcodep;
	252	int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
	253	struct mmix_dis_info *minfop;
	254
	255	if (status != 0)
	256	{
	257	(*info->memory_error_func) (status, memaddr, info);
	258	return -1;
	259	}
	260
	261	/* FIXME: Is -1 suitable? */
	262	if (info->private_data == NULL
	263	&& ! initialize_mmix_dis_info (info))
	264	return -1;
	265
	266	minfop = (struct mmix_dis_info *) info->private_data;
	267	x = buffer[1];
	268	y = buffer[2];
	269	z = buffer[3];
	270
	271	insn = bfd_getb32 (buffer);
	272
	273	opcodep = get_opcode (insn);
	274
	275	if (opcodep == NULL)
	276	{
	277	(info->fprintf_func) (info->stream, _("unknown*"));
	278	return 4;
	279	}
	280
	281	(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
	282
	283	/* Present bytes in the order they are laid out in memory. */
	284	info->display_endian = BFD_ENDIAN_BIG;
	285
	286	info->insn_info_valid = 1;
	287	info->bytes_per_chunk = 4;
	288	info->branch_delay_insns = 0;
	289	info->target = 0;
	290	switch (opcodep->type)
	291	{
	292	case mmix_type_normal:
	293	case mmix_type_memaccess_block:
	294	info->insn_type = dis_nonbranch;
	295	break;
	296
	297	case mmix_type_branch:
	298	info->insn_type = dis_branch;
	299	break;
	300
	301	case mmix_type_condbranch:
	302	info->insn_type = dis_condbranch;
	303	break;
	304
	305	case mmix_type_memaccess_octa:
	306	info->insn_type = dis_dref;
	307	info->data_size = 8;
	308	break;
	309
	310	case mmix_type_memaccess_tetra:
311	info->insn_type = dis_dref;
312	info->data_size = 4;
313	break;
314
315	case mmix_type_memaccess_wyde:
316	info->insn_type = dis_dref;
317	info->data_size = 2;
318	break;
319
320	case mmix_type_memaccess_byte:
321	info->insn_type = dis_dref;
322	info->data_size = 1;
323	break;
324
325	case mmix_type_jsr:
326	info->insn_type = dis_jsr;
327	break;
328
329	default:
330	BAD_CASE(opcodep->type);
331	}
332
333	switch (opcodep->operands)
334	{
335	case mmix_operands_regs:
336	/* All registers: "$X,$Y,$Z". */
337	(*info->fprintf_func) (info->stream, "%s,%s,%s",
338	minfop->reg_name[x],
339	minfop->reg_name[y],
340	minfop->reg_name[z]);
341	break;
342
343	case mmix_operands_reg_yz:
344	/* Like SETH - "$X,YZ". */
345	(*info->fprintf_func) (info->stream, "%s,0x%x",
346	minfop->reg_name[x], y * 256 + z);
347	break;
348
349	case mmix_operands_regs_z_opt:
350	case mmix_operands_regs_z:
351	case mmix_operands_pushgo:
352	/* The regular "$X,$Y,$Z\|Z". */
353	if (insn & INSN_IMMEDIATE_BIT)
354	(*info->fprintf_func) (info->stream, "%s,%s,%d",
355	minfop->reg_name[x], minfop->reg_name[y], z);
356	else
357	(*info->fprintf_func) (info->stream, "%s,%s,%s",
358	minfop->reg_name[x],
359	minfop->reg_name[y],
360	minfop->reg_name[z]);
361	break;
362
363	case mmix_operands_jmp:
364	/* Address; only JMP. */
365	{
366	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
367
368	if (insn & INSN_BACKWARD_OFFSET_BIT)
369	offset -= (256 * 65536) * 4;
370
371	info->target = memaddr + offset;
372	(*info->print_address_func) (memaddr + offset, info);
373	}
374	break;
375
376	case mmix_operands_roundregs_z:
377	/* Two registers, like FLOT, possibly with rounding: "$X,$Z\|Z"
378	"$X,ROUND_MODE,$Z\|Z". */
379	if (y != 0)
380	{
381	if (insn & INSN_IMMEDIATE_BIT)
382	(*info->fprintf_func) (info->stream, "%s,%s,%d",
383	minfop->reg_name[x],
384	ROUND_MODE (y), z);
385	else
386	(*info->fprintf_func) (info->stream, "%s,%s,%s",
387	minfop->reg_name[x],
388	ROUND_MODE (y),
389	minfop->reg_name[z]);
390	}
391	else
392	{
393	if (insn & INSN_IMMEDIATE_BIT)
394	(*info->fprintf_func) (info->stream, "%s,%d",
395	minfop->reg_name[x], z);
396	else
397	(*info->fprintf_func) (info->stream, "%s,%s",
398	minfop->reg_name[x],
399	minfop->reg_name[z]);
400	}
401	break;
402
403	case mmix_operands_pop:
404	/* Like POP - "X,YZ". */
405	(info->fprintf_func) (info->stream, "%d,%d", x, y256 + z);
406	break;
407
408	case mmix_operands_roundregs:
409	/* Two registers, possibly with rounding: "$X,$Z" or
410	"$X,ROUND_MODE,$Z". */
411	if (y != 0)
412	(*info->fprintf_func) (info->stream, "%s,%s,%s",
413	minfop->reg_name[x],
414	ROUND_MODE (y),
415	minfop->reg_name[z]);
416	else
417	(*info->fprintf_func) (info->stream, "%s,%s",
418	minfop->reg_name[x],
419	minfop->reg_name[z]);
420	break;
421
422	case mmix_operands_sync:
423	/* Like SYNC - "XYZ". */
424	(*info->fprintf_func) (info->stream, "%u",
425	x * 65536 + y * 256 + z);
426	break;
427
428	case mmix_operands_x_regs_z:
429	/* Like SYNCD - "X,$Y,$Z\|Z". */
430	if (insn & INSN_IMMEDIATE_BIT)
431	(*info->fprintf_func) (info->stream, "%d,%s,%d",
432	x, minfop->reg_name[y], z);
433	else
434	(*info->fprintf_func) (info->stream, "%d,%s,%s",
435	x, minfop->reg_name[y],
436	minfop->reg_name[z]);
437	break;
438
439	case mmix_operands_neg:
440	/* Like NEG and NEGU - "$X,Y,$Z\|Z". */
441	if (insn & INSN_IMMEDIATE_BIT)
442	(*info->fprintf_func) (info->stream, "%s,%d,%d",
443	minfop->reg_name[x], y, z);
444	else
445	(*info->fprintf_func) (info->stream, "%s,%d,%s",
446	minfop->reg_name[x], y,
447	minfop->reg_name[z]);
448	break;
449
450	case mmix_operands_pushj:
451	case mmix_operands_regaddr:
452	/* Like GETA or branches - "$X,Address". */
453	{
454	bfd_signed_vma offset = (y * 256 + z) * 4;
455
456	if (insn & INSN_BACKWARD_OFFSET_BIT)
457	offset -= 65536 * 4;
458
459	info->target = memaddr + offset;
460
461	(*info->fprintf_func) (info->stream, "%s,", minfop->reg_name[x]);
462	(*info->print_address_func) (memaddr + offset, info);
463	}
464	break;
465
466	case mmix_operands_get:
467	/* GET - "X,spec_reg". */
468	(*info->fprintf_func) (info->stream, "%s,%s",
469	minfop->reg_name[x],
470	minfop->spec_reg_name[z]);
471	break;
472
473	case mmix_operands_put:
474	/* PUT - "spec_reg,$Z\|Z". */
475	if (insn & INSN_IMMEDIATE_BIT)
476	(*info->fprintf_func) (info->stream, "%s,%d",
477	minfop->spec_reg_name[x], z);
478	else
479	(*info->fprintf_func) (info->stream, "%s,%s",
480	minfop->spec_reg_name[x],
481	minfop->reg_name[z]);
482	break;
483
484	case mmix_operands_set:
485	/* Two registers, "$X,$Y". */
486	(*info->fprintf_func) (info->stream, "%s,%s",
487	minfop->reg_name[x],
488	minfop->reg_name[y]);
489	break;
490
491	case mmix_operands_save:
492	/* SAVE - "$X,0". */
493	(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
494	break;
495
496	case mmix_operands_unsave:
497	/* UNSAVE - "0,$Z". */
498	(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
499	break;
500
501	case mmix_operands_xyz_opt:
502	/* Like SWYM or TRAP - "X,Y,Z". */
503	(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
504	break;
505
506	case mmix_operands_resume:
507	/* Just "Z", like RESUME. */
508	(*info->fprintf_func) (info->stream, "%d", z);
509	break;
510
511	default:
512	(info->fprintf_func) (info->stream, _("unknown operands type: %d*"),
513	opcodep->operands);
514	break;
515	}
516
517	return 4;
518	}