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

/* mmix-dis.c -- Disassemble MMIX instructions.
   Copyright 2000, 2001, 2002, 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));
  int 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;
	  long i;

	  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], "$%d", 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.
9b201bb5	2	Copyright 2000, 2001, 2002, 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 ("$255")];
	68	};
	69
afd30973 HPN	70	/* Initialize a target-specific array in INFO. */
afd30973 HPN	71
b34976b6	72	static bfd_boolean
47b0e7ad	73	initialize_mmix_dis_info (struct disassemble_info *info)
afd30973 HPN	74	{
	75	struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
	76	int i;
	77
	78	if (minfop == NULL)
b34976b6	79	return FALSE;
afd30973 HPN	80
	81	memset (minfop, 0, sizeof (*minfop));
	82
	83	/* Initialize register names from register symbols. If there's no
	84	register section, then there are no register symbols. */
	85	if ((info->section != NULL && info->section->owner != NULL)
	86	\|\| (info->symbols != NULL
	87	&& info->symbols[0] != NULL
	88	&& bfd_asymbol_bfd (info->symbols[0]) != NULL))
	89	{
	90	bfd *abfd = info->section && info->section->owner != NULL
	91	? info->section->owner
	92	: bfd_asymbol_bfd (info->symbols[0]);
	93	asection reg_section = bfd_get_section_by_name (abfd, "REG*");
	94
	95	if (reg_section != NULL)
	96	{
	97	/* The returned symcount does include the ending NULL. */
	98	long symsize = bfd_get_symtab_upper_bound (abfd);
	99	asymbol **syms = malloc (symsize);
	100	long nsyms;
	101	long i;
	102
	103	if (syms == NULL)
47b0e7ad NC	104	{
47b0e7ad NC	105	FATAL_DEBUG;
afd30973	106	free (minfop);
b34976b6	107	return FALSE;
afd30973 HPN	108	}
	109	nsyms = bfd_canonicalize_symtab (abfd, syms);
	110
	111	/* We use the first name for a register. If this is MMO, then
	112	it's the name with the first sequence number, presumably the
	113	first in the source. */
	114	for (i = 0; i < nsyms && syms[i] != NULL; i++)
	115	{
	116	if (syms[i]->section == reg_section
	117	&& syms[i]->value < 256
	118	&& minfop->reg_name[syms[i]->value] == NULL)
	119	minfop->reg_name[syms[i]->value] = syms[i]->name;
	120	}
	121	}
	122	}
	123
	124	/* Fill in the rest with the canonical names. */
	125	for (i = 0; i < 256; i++)
	126	if (minfop->reg_name[i] == NULL)
	127	{
	128	sprintf (minfop->basic_reg_name[i], "$%d", i);
	129	minfop->reg_name[i] = minfop->basic_reg_name[i];
	130	}
	131
	132	/* We assume it's actually a one-to-one mapping of number-to-name. */
	133	for (i = 0; mmix_spec_regs[i].name != NULL; i++)
	134	minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;
	135
47b0e7ad	136	info->private_data = (void *) minfop;
b34976b6	137	return TRUE;
afd30973 HPN	138	}
	139
	140	/* A table indexed by the first byte is constructed as we disassemble each
	141	tetrabyte. The contents is a pointer into mmix_insns reflecting the
	142	first found entry with matching match-bits and lose-bits. Further
	143	entries are considered one after one until the operand constraints
	144	match or the match-bits and lose-bits do not match. Normally a
	145	"further entry" will just show that there was no other match. */
	146
	147	static const struct mmix_opcode *
47b0e7ad	148	get_opcode (unsigned long insn)
afd30973 HPN	149	{
	150	static const struct mmix_opcode **opcodes = NULL;
	151	const struct mmix_opcode *opcodep = mmix_opcodes;
	152	unsigned int opcode_part = (insn >> 24) & 255;
47b0e7ad	153
afd30973 HPN	154	if (opcodes == NULL)
	155	opcodes = xcalloc (256, sizeof (struct mmix_opcode *));
	156
	157	opcodep = opcodes[opcode_part];
	158	if (opcodep == NULL
	159	\|\| (opcodep->match & insn) != opcodep->match
	160	\|\| (opcodep->lose & insn) != 0)
	161	{
	162	/* Search through the table. */
	163	for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
	164	{
	165	/* FIXME: Break out this into an initialization function. */
	166	if ((opcodep->match & (opcode_part << 24)) == opcode_part
	167	&& (opcodep->lose & (opcode_part << 24)) == 0)
	168	opcodes[opcode_part] = opcodep;
	169
	170	if ((opcodep->match & insn) == opcodep->match
	171	&& (opcodep->lose & insn) == 0)
	172	break;
	173	}
	174	}
	175
	176	if (opcodep->name == NULL)
	177	return NULL;
	178
	179	/* Check constraints. If they don't match, loop through the next opcode
	180	entries. */
	181	do
	182	{
	183	switch (opcodep->operands)
	184	{
	185	/* These have no restraint on what can be in the lower three
	186	bytes. */
	187	case mmix_operands_regs:
	188	case mmix_operands_reg_yz:
	189	case mmix_operands_regs_z_opt:
	190	case mmix_operands_regs_z:
	191	case mmix_operands_jmp:
	192	case mmix_operands_pushgo:
	193	case mmix_operands_pop:
	194	case mmix_operands_sync:
	195	case mmix_operands_x_regs_z:
	196	case mmix_operands_neg:
	197	case mmix_operands_pushj:
	198	case mmix_operands_regaddr:
	199	case mmix_operands_get:
	200	case mmix_operands_set:
	201	case mmix_operands_save:
	202	case mmix_operands_unsave:
	203	case mmix_operands_xyz_opt:
	204	return opcodep;
	205
	206	/* For a ROUND_MODE, the middle byte must be 0..4. */
	207	case mmix_operands_roundregs_z:
	208	case mmix_operands_roundregs:
	209	{
	210	int midbyte = (insn >> 8) & 255;
47b0e7ad	211
afd30973 HPN	212	if (midbyte <= 4)
	213	return opcodep;
	214	}
	215	break;
	216
	217	case mmix_operands_put:
	218	/* A "PUT". If it is "immediate", then no restrictions,
	219	otherwise we have to make sure the register number is < 32. */
	220	if ((insn & INSN_IMMEDIATE_BIT)
	221	\|\| ((insn >> 16) & 255) < 32)
	222	return opcodep;
	223	break;
	224
	225	case mmix_operands_resume:
	226	/* Middle bytes must be zero. */
	227	if ((insn & 0x00ffff00) == 0)
	228	return opcodep;
	229	break;
	230
	231	default:
	232	BAD_CASE (opcodep->operands);
	233	}
	234
	235	opcodep++;
	236	}
	237	while ((opcodep->match & insn) == opcodep->match
	238	&& (opcodep->lose & insn) == 0);
	239
	240	/* If we got here, we had no match. */
	241	return NULL;
	242	}
	243
	244	/* The main disassembly function. */
	245
	246	int
47b0e7ad	247	print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
afd30973 HPN	248	{
	249	unsigned char buffer[4];
	250	unsigned long insn;
	251	unsigned int x, y, z;
	252	const struct mmix_opcode *opcodep;
	253	int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
	254	struct mmix_dis_info *minfop;
	255
	256	if (status != 0)
	257	{
	258	(*info->memory_error_func) (status, memaddr, info);
	259	return -1;
	260	}
	261
	262	/* FIXME: Is -1 suitable? */
	263	if (info->private_data == NULL
	264	&& ! initialize_mmix_dis_info (info))
	265	return -1;
	266
	267	minfop = (struct mmix_dis_info *) info->private_data;
	268	x = buffer[1];
	269	y = buffer[2];
	270	z = buffer[3];
	271
	272	insn = bfd_getb32 (buffer);
	273
	274	opcodep = get_opcode (insn);
	275
	276	if (opcodep == NULL)
	277	{
	278	(info->fprintf_func) (info->stream, _("unknown*"));
	279	return 4;
	280	}
	281
	282	(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
	283
	284	/* Present bytes in the order they are laid out in memory. */
	285	info->display_endian = BFD_ENDIAN_BIG;
	286
	287	info->insn_info_valid = 1;
	288	info->bytes_per_chunk = 4;
	289	info->branch_delay_insns = 0;
	290	info->target = 0;
	291	switch (opcodep->type)
	292	{
	293	case mmix_type_normal:
	294	case mmix_type_memaccess_block:
	295	info->insn_type = dis_nonbranch;
	296	break;
	297
	298	case mmix_type_branch:
	299	info->insn_type = dis_branch;
	300	break;
	301
	302	case mmix_type_condbranch:
	303	info->insn_type = dis_condbranch;
	304	break;
	305
	306	case mmix_type_memaccess_octa:
	307	info->insn_type = dis_dref;
	308	info->data_size = 8;
	309	break;
	310
	311	case mmix_type_memaccess_tetra:
312	info->insn_type = dis_dref;
313	info->data_size = 4;
314	break;
315
316	case mmix_type_memaccess_wyde:
317	info->insn_type = dis_dref;
318	info->data_size = 2;
319	break;
320
321	case mmix_type_memaccess_byte:
322	info->insn_type = dis_dref;
323	info->data_size = 1;
324	break;
325
326	case mmix_type_jsr:
327	info->insn_type = dis_jsr;
328	break;
329
330	default:
331	BAD_CASE(opcodep->type);
332	}
333
334	switch (opcodep->operands)
335	{
336	case mmix_operands_regs:
337	/* All registers: "$X,$Y,$Z". */
338	(*info->fprintf_func) (info->stream, "%s,%s,%s",
339	minfop->reg_name[x],
340	minfop->reg_name[y],
341	minfop->reg_name[z]);
342	break;
343
344	case mmix_operands_reg_yz:
345	/* Like SETH - "$X,YZ". */
346	(*info->fprintf_func) (info->stream, "%s,0x%x",
347	minfop->reg_name[x], y * 256 + z);
348	break;
349
350	case mmix_operands_regs_z_opt:
351	case mmix_operands_regs_z:
352	case mmix_operands_pushgo:
353	/* The regular "$X,$Y,$Z\|Z". */
354	if (insn & INSN_IMMEDIATE_BIT)
355	(*info->fprintf_func) (info->stream, "%s,%s,%d",
356	minfop->reg_name[x], minfop->reg_name[y], z);
357	else
358	(*info->fprintf_func) (info->stream, "%s,%s,%s",
359	minfop->reg_name[x],
360	minfop->reg_name[y],
361	minfop->reg_name[z]);
362	break;
363
364	case mmix_operands_jmp:
365	/* Address; only JMP. */
366	{
367	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
368
369	if (insn & INSN_BACKWARD_OFFSET_BIT)
370	offset -= (256 * 65536) * 4;
371
372	info->target = memaddr + offset;
373	(*info->print_address_func) (memaddr + offset, info);
374	}
375	break;
376
377	case mmix_operands_roundregs_z:
378	/* Two registers, like FLOT, possibly with rounding: "$X,$Z\|Z"
379	"$X,ROUND_MODE,$Z\|Z". */
380	if (y != 0)
381	{
382	if (insn & INSN_IMMEDIATE_BIT)
383	(*info->fprintf_func) (info->stream, "%s,%s,%d",
384	minfop->reg_name[x],
385	ROUND_MODE (y), z);
386	else
387	(*info->fprintf_func) (info->stream, "%s,%s,%s",
388	minfop->reg_name[x],
389	ROUND_MODE (y),
390	minfop->reg_name[z]);
391	}
392	else
393	{
394	if (insn & INSN_IMMEDIATE_BIT)
395	(*info->fprintf_func) (info->stream, "%s,%d",
396	minfop->reg_name[x], z);
397	else
398	(*info->fprintf_func) (info->stream, "%s,%s",
399	minfop->reg_name[x],
400	minfop->reg_name[z]);
401	}
402	break;
403
404	case mmix_operands_pop:
405	/* Like POP - "X,YZ". */
406	(info->fprintf_func) (info->stream, "%d,%d", x, y256 + z);
407	break;
408
409	case mmix_operands_roundregs:
410	/* Two registers, possibly with rounding: "$X,$Z" or
411	"$X,ROUND_MODE,$Z". */
412	if (y != 0)
413	(*info->fprintf_func) (info->stream, "%s,%s,%s",
414	minfop->reg_name[x],
415	ROUND_MODE (y),
416	minfop->reg_name[z]);
417	else
418	(*info->fprintf_func) (info->stream, "%s,%s",
419	minfop->reg_name[x],
420	minfop->reg_name[z]);
421	break;
422
423	case mmix_operands_sync:
424	/* Like SYNC - "XYZ". */
425	(*info->fprintf_func) (info->stream, "%u",
426	x * 65536 + y * 256 + z);
427	break;
428
429	case mmix_operands_x_regs_z:
430	/* Like SYNCD - "X,$Y,$Z\|Z". */
431	if (insn & INSN_IMMEDIATE_BIT)
432	(*info->fprintf_func) (info->stream, "%d,%s,%d",
433	x, minfop->reg_name[y], z);
434	else
435	(*info->fprintf_func) (info->stream, "%d,%s,%s",
436	x, minfop->reg_name[y],
437	minfop->reg_name[z]);
438	break;
439
440	case mmix_operands_neg:
441	/* Like NEG and NEGU - "$X,Y,$Z\|Z". */
442	if (insn & INSN_IMMEDIATE_BIT)
443	(*info->fprintf_func) (info->stream, "%s,%d,%d",
444	minfop->reg_name[x], y, z);
445	else
446	(*info->fprintf_func) (info->stream, "%s,%d,%s",
447	minfop->reg_name[x], y,
448	minfop->reg_name[z]);
449	break;
450
451	case mmix_operands_pushj:
452	case mmix_operands_regaddr:
453	/* Like GETA or branches - "$X,Address". */
454	{
455	bfd_signed_vma offset = (y * 256 + z) * 4;
456
457	if (insn & INSN_BACKWARD_OFFSET_BIT)
458	offset -= 65536 * 4;
459
460	info->target = memaddr + offset;
461
462	(*info->fprintf_func) (info->stream, "%s,", minfop->reg_name[x]);
463	(*info->print_address_func) (memaddr + offset, info);
464	}
465	break;
466
467	case mmix_operands_get:
468	/* GET - "X,spec_reg". */
469	(*info->fprintf_func) (info->stream, "%s,%s",
470	minfop->reg_name[x],
471	minfop->spec_reg_name[z]);
472	break;
473
474	case mmix_operands_put:
475	/* PUT - "spec_reg,$Z\|Z". */
476	if (insn & INSN_IMMEDIATE_BIT)
477	(*info->fprintf_func) (info->stream, "%s,%d",
478	minfop->spec_reg_name[x], z);
479	else
480	(*info->fprintf_func) (info->stream, "%s,%s",
481	minfop->spec_reg_name[x],
482	minfop->reg_name[z]);
483	break;
484
485	case mmix_operands_set:
486	/* Two registers, "$X,$Y". */
487	(*info->fprintf_func) (info->stream, "%s,%s",
488	minfop->reg_name[x],
489	minfop->reg_name[y]);
490	break;
491
492	case mmix_operands_save:
493	/* SAVE - "$X,0". */
494	(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
495	break;
496
497	case mmix_operands_unsave:
498	/* UNSAVE - "0,$Z". */
499	(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
500	break;
501
502	case mmix_operands_xyz_opt:
503	/* Like SWYM or TRAP - "X,Y,Z". */
504	(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
505	break;
506
507	case mmix_operands_resume:
508	/* Just "Z", like RESUME. */
509	(*info->fprintf_func) (info->stream, "%d", z);
510	break;
511
512	default:
513	(info->fprintf_func) (info->stream, _("unknown operands type: %d*"),
514	opcodep->operands);
515	break;
516	}
517
518	return 4;
519	}