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

/* mmix-dis.c -- Disassemble MMIX instructions.
   Copyright (C) 2000-2020 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 "sysdep.h"
#include <stdio.h>
#include "opcode/mmix.h"
#include "disassemble.h"
#include "libiberty.h"
#include "bfd.h"
#include "opintl.h"

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

#define FATAL_DEBUG						\
 do								\
   {								\
     opcodes_error_handler (_("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)

#define MAX_REG_NAME_LEN       256
#define MAX_SPEC_REG_NAME_LEN  32
struct mmix_dis_info
 {
   const char *reg_name[MAX_REG_NAME_LEN];
   const char *spec_reg_name[MAX_SPEC_REG_NAME_LEN];

   /* 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[MAX_REG_NAME_LEN][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 < MAX_REG_NAME_LEN
		  && 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 < MAX_REG_NAME_LEN; 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;
}

static inline const char *
get_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
{
  if (x >= MAX_REG_NAME_LEN)
    return _("*illegal*");
  return minfop->reg_name[x];
}

static inline const char *
get_spec_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
{
  if (x >= MAX_SPEC_REG_NAME_LEN)
    return _("*illegal*");
  return minfop->spec_reg_name[x];
}

/* 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",
			     get_reg_name (minfop, x),
			     get_reg_name (minfop, y),
			     get_reg_name (minfop, z));
      break;

    case mmix_operands_reg_yz:
      /* Like SETH - "$X,YZ".  */
      (*info->fprintf_func) (info->stream, "%s,0x%x",
			     get_reg_name (minfop, 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",
			       get_reg_name (minfop, x),
			       get_reg_name (minfop, y), z);
      else
	(*info->fprintf_func) (info->stream, "%s,%s,%s",
			       get_reg_name (minfop, x),
			       get_reg_name (minfop, y),
			       get_reg_name (minfop, 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",
				   get_reg_name (minfop, x),
				   ROUND_MODE (y), z);
	  else
	    (*info->fprintf_func) (info->stream, "%s,%s,%s",
				   get_reg_name (minfop, x),
				   ROUND_MODE (y),
				   get_reg_name (minfop, z));
	}
      else
	{
	  if (insn & INSN_IMMEDIATE_BIT)
	    (*info->fprintf_func) (info->stream, "%s,%d",
				   get_reg_name (minfop, x), z);
	  else
	    (*info->fprintf_func) (info->stream, "%s,%s",
				   get_reg_name (minfop, x),
				   get_reg_name (minfop, 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",
			       get_reg_name (minfop, x),
			       ROUND_MODE (y),
			       get_reg_name (minfop, z));
      else
	(*info->fprintf_func) (info->stream, "%s,%s",
			       get_reg_name (minfop, x),
			       get_reg_name (minfop, 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, get_reg_name (minfop, y), z);
      else
	(*info->fprintf_func) (info->stream, "%d,%s,%s",
			       x, get_reg_name (minfop, y),
			       get_reg_name (minfop, 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",
			       get_reg_name (minfop, x), y, z);
      else
	(*info->fprintf_func) (info->stream, "%s,%d,%s",
			       get_reg_name (minfop, x), y,
			       get_reg_name (minfop, 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,", get_reg_name (minfop, x));
	(*info->print_address_func) (memaddr + offset, info);
      }
      break;

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

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

    case mmix_operands_set:
      /*  Two registers, "$X,$Y".  */
      (*info->fprintf_func) (info->stream, "%s,%s",
			     get_reg_name (minfop, x),
			     get_reg_name (minfop, 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.
b3adc24a	2	Copyright (C) 2000-2020 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	21
5eb3690e	22	#include "sysdep.h"
afd30973	23	#include <stdio.h>
afd30973	24	#include "opcode/mmix.h"
88c1242d	25	#include "disassemble.h"
afd30973 HPN	26	#include "libiberty.h"
	27	#include "bfd.h"
	28	#include "opintl.h"
	29
a6743a54 AM	30	#define BAD_CASE(x) \
	31	do \
	32	{ \
	33	opcodes_error_handler (_("bad case %d (%s) in %s:%d"), \
	34	x, #x, __FILE__, __LINE__); \
	35	abort (); \
	36	} \
afd30973 HPN	37	while (0)
afd30973 HPN	38
a6743a54 AM	39	#define FATAL_DEBUG \
	40	do \
	41	{ \
	42	opcodes_error_handler (_("internal: non-debugged code " \
	43	"(test-case missing): %s:%d"), \
	44	__FILE__, __LINE__); \
	45	abort (); \
	46	} \
afd30973 HPN	47	while (0)
	48
	49	#define ROUND_MODE(n) \
	50	((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \
	51	(n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \
	52	_("(unknown)"))
	53
	54	#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
	55	#define INSN_BACKWARD_OFFSET_BIT (1 << 24)
	56
1e4b5e7d NC	57	#define MAX_REG_NAME_LEN 256
1e4b5e7d NC	58	#define MAX_SPEC_REG_NAME_LEN 32
afd30973 HPN	59	struct mmix_dis_info
afd30973 HPN	60	{
1e4b5e7d NC	61	const char *reg_name[MAX_REG_NAME_LEN];
1e4b5e7d NC	62	const char *spec_reg_name[MAX_SPEC_REG_NAME_LEN];
afd30973 HPN	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. */
1e4b5e7d	67	char basic_reg_name[MAX_REG_NAME_LEN][sizeof ("$255")];
afd30973 HPN	68	};
afd30973 HPN	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
1e4b5e7d	116	&& syms[i]->value < MAX_REG_NAME_LEN
afd30973 HPN	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. */
1e4b5e7d	124	for (i = 0; i < MAX_REG_NAME_LEN; i++)
afd30973 HPN	125	if (minfop->reg_name[i] == NULL)
afd30973 HPN	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
1e4b5e7d NC	243	static inline const char *
	244	get_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
	245	{
	246	if (x >= MAX_REG_NAME_LEN)
	247	return _("illegal");
	248	return minfop->reg_name[x];
	249	}
	250
	251	static inline const char *
	252	get_spec_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
	253	{
	254	if (x >= MAX_SPEC_REG_NAME_LEN)
	255	return _("illegal");
	256	return minfop->spec_reg_name[x];
	257	}
	258
afd30973 HPN	259	/* The main disassembly function. */
	260
	261	int
47b0e7ad	262	print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
afd30973 HPN	263	{
	264	unsigned char buffer[4];
	265	unsigned long insn;
	266	unsigned int x, y, z;
	267	const struct mmix_opcode *opcodep;
	268	int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
	269	struct mmix_dis_info *minfop;
	270
	271	if (status != 0)
	272	{
	273	(*info->memory_error_func) (status, memaddr, info);
	274	return -1;
	275	}
	276
	277	/* FIXME: Is -1 suitable? */
	278	if (info->private_data == NULL
	279	&& ! initialize_mmix_dis_info (info))
	280	return -1;
	281
	282	minfop = (struct mmix_dis_info *) info->private_data;
	283	x = buffer[1];
	284	y = buffer[2];
	285	z = buffer[3];
	286
	287	insn = bfd_getb32 (buffer);
	288
	289	opcodep = get_opcode (insn);
	290
	291	if (opcodep == NULL)
	292	{
	293	(info->fprintf_func) (info->stream, _("unknown*"));
	294	return 4;
	295	}
	296
	297	(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
	298
	299	/* Present bytes in the order they are laid out in memory. */
	300	info->display_endian = BFD_ENDIAN_BIG;
	301
	302	info->insn_info_valid = 1;
	303	info->bytes_per_chunk = 4;
	304	info->branch_delay_insns = 0;
	305	info->target = 0;
	306	switch (opcodep->type)
	307	{
	308	case mmix_type_normal:
	309	case mmix_type_memaccess_block:
	310	info->insn_type = dis_nonbranch;
	311	break;
	312
	313	case mmix_type_branch:
	314	info->insn_type = dis_branch;
	315	break;
	316
	317	case mmix_type_condbranch:
	318	info->insn_type = dis_condbranch;
	319	break;
	320
	321	case mmix_type_memaccess_octa:
	322	info->insn_type = dis_dref;
	323	info->data_size = 8;
	324	break;
	325
	326	case mmix_type_memaccess_tetra:
327	info->insn_type = dis_dref;
328	info->data_size = 4;
329	break;
330
331	case mmix_type_memaccess_wyde:
332	info->insn_type = dis_dref;
333	info->data_size = 2;
334	break;
335
336	case mmix_type_memaccess_byte:
337	info->insn_type = dis_dref;
338	info->data_size = 1;
339	break;
340
341	case mmix_type_jsr:
342	info->insn_type = dis_jsr;
343	break;
344
345	default:
346	BAD_CASE(opcodep->type);
347	}
348
349	switch (opcodep->operands)
350	{
351	case mmix_operands_regs:
352	/* All registers: "$X,$Y,$Z". */
353	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d NC	354	get_reg_name (minfop, x),
	355	get_reg_name (minfop, y),
	356	get_reg_name (minfop, z));
afd30973 HPN	357	break;
	358
	359	case mmix_operands_reg_yz:
	360	/* Like SETH - "$X,YZ". */
	361	(*info->fprintf_func) (info->stream, "%s,0x%x",
1e4b5e7d	362	get_reg_name (minfop, x), y * 256 + z);
afd30973 HPN	363	break;
	364
	365	case mmix_operands_regs_z_opt:
	366	case mmix_operands_regs_z:
	367	case mmix_operands_pushgo:
	368	/* The regular "$X,$Y,$Z\|Z". */
	369	if (insn & INSN_IMMEDIATE_BIT)
	370	(*info->fprintf_func) (info->stream, "%s,%s,%d",
1e4b5e7d NC	371	get_reg_name (minfop, x),
1e4b5e7d NC	372	get_reg_name (minfop, y), z);
afd30973 HPN	373	else
afd30973 HPN	374	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d NC	375	get_reg_name (minfop, x),
	376	get_reg_name (minfop, y),
	377	get_reg_name (minfop, z));
afd30973 HPN	378	break;
	379
	380	case mmix_operands_jmp:
	381	/* Address; only JMP. */
	382	{
	383	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
	384
	385	if (insn & INSN_BACKWARD_OFFSET_BIT)
	386	offset -= (256 * 65536) * 4;
	387
	388	info->target = memaddr + offset;
	389	(*info->print_address_func) (memaddr + offset, info);
	390	}
	391	break;
	392
	393	case mmix_operands_roundregs_z:
	394	/* Two registers, like FLOT, possibly with rounding: "$X,$Z\|Z"
	395	"$X,ROUND_MODE,$Z\|Z". */
	396	if (y != 0)
	397	{
	398	if (insn & INSN_IMMEDIATE_BIT)
	399	(*info->fprintf_func) (info->stream, "%s,%s,%d",
1e4b5e7d	400	get_reg_name (minfop, x),
afd30973 HPN	401	ROUND_MODE (y), z);
	402	else
	403	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d	404	get_reg_name (minfop, x),
afd30973	405	ROUND_MODE (y),
1e4b5e7d	406	get_reg_name (minfop, z));
afd30973 HPN	407	}
	408	else
	409	{
	410	if (insn & INSN_IMMEDIATE_BIT)
	411	(*info->fprintf_func) (info->stream, "%s,%d",
1e4b5e7d	412	get_reg_name (minfop, x), z);
afd30973 HPN	413	else
afd30973 HPN	414	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	415	get_reg_name (minfop, x),
1e4b5e7d NC	416	get_reg_name (minfop, z));
afd30973 HPN	417	}
	418	break;
	419
	420	case mmix_operands_pop:
	421	/* Like POP - "X,YZ". */
	422	(info->fprintf_func) (info->stream, "%d,%d", x, y256 + z);
	423	break;
	424
	425	case mmix_operands_roundregs:
	426	/* Two registers, possibly with rounding: "$X,$Z" or
	427	"$X,ROUND_MODE,$Z". */
	428	if (y != 0)
	429	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d	430	get_reg_name (minfop, x),
afd30973	431	ROUND_MODE (y),
1e4b5e7d	432	get_reg_name (minfop, z));
afd30973 HPN	433	else
afd30973 HPN	434	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	435	get_reg_name (minfop, x),
1e4b5e7d NC	436	get_reg_name (minfop, z));
afd30973 HPN	437	break;
	438
	439	case mmix_operands_sync:
	440	/* Like SYNC - "XYZ". */
	441	(*info->fprintf_func) (info->stream, "%u",
	442	x * 65536 + y * 256 + z);
	443	break;
	444
	445	case mmix_operands_x_regs_z:
	446	/* Like SYNCD - "X,$Y,$Z\|Z". */
	447	if (insn & INSN_IMMEDIATE_BIT)
	448	(*info->fprintf_func) (info->stream, "%d,%s,%d",
1e4b5e7d	449	x, get_reg_name (minfop, y), z);
afd30973 HPN	450	else
afd30973 HPN	451	(*info->fprintf_func) (info->stream, "%d,%s,%s",
1e4b5e7d NC	452	x, get_reg_name (minfop, y),
1e4b5e7d NC	453	get_reg_name (minfop, z));
afd30973 HPN	454	break;
	455
	456	case mmix_operands_neg:
	457	/* Like NEG and NEGU - "$X,Y,$Z\|Z". */
	458	if (insn & INSN_IMMEDIATE_BIT)
	459	(*info->fprintf_func) (info->stream, "%s,%d,%d",
1e4b5e7d	460	get_reg_name (minfop, x), y, z);
afd30973 HPN	461	else
afd30973 HPN	462	(*info->fprintf_func) (info->stream, "%s,%d,%s",
1e4b5e7d NC	463	get_reg_name (minfop, x), y,
1e4b5e7d NC	464	get_reg_name (minfop, z));
afd30973 HPN	465	break;
	466
	467	case mmix_operands_pushj:
	468	case mmix_operands_regaddr:
	469	/* Like GETA or branches - "$X,Address". */
	470	{
	471	bfd_signed_vma offset = (y * 256 + z) * 4;
	472
	473	if (insn & INSN_BACKWARD_OFFSET_BIT)
	474	offset -= 65536 * 4;
	475
	476	info->target = memaddr + offset;
	477
1e4b5e7d	478	(*info->fprintf_func) (info->stream, "%s,", get_reg_name (minfop, x));
afd30973 HPN	479	(*info->print_address_func) (memaddr + offset, info);
	480	}
	481	break;
	482
	483	case mmix_operands_get:
	484	/* GET - "X,spec_reg". */
	485	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	486	get_reg_name (minfop, x),
1e4b5e7d NC	487	get_spec_reg_name (minfop, z));
afd30973 HPN	488	break;
	489
	490	case mmix_operands_put:
	491	/* PUT - "spec_reg,$Z\|Z". */
	492	if (insn & INSN_IMMEDIATE_BIT)
	493	(*info->fprintf_func) (info->stream, "%s,%d",
1e4b5e7d	494	get_spec_reg_name (minfop, x), z);
afd30973 HPN	495	else
afd30973 HPN	496	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	497	get_spec_reg_name (minfop, x),
1e4b5e7d NC	498	get_reg_name (minfop, z));
afd30973 HPN	499	break;
	500
	501	case mmix_operands_set:
	502	/* Two registers, "$X,$Y". */
	503	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	504	get_reg_name (minfop, x),
1e4b5e7d NC	505	get_reg_name (minfop, y));
afd30973 HPN	506	break;
	507
	508	case mmix_operands_save:
	509	/* SAVE - "$X,0". */
	510	(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
	511	break;
	512
	513	case mmix_operands_unsave:
	514	/* UNSAVE - "0,$Z". */
	515	(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
	516	break;
	517
	518	case mmix_operands_xyz_opt:
	519	/* Like SWYM or TRAP - "X,Y,Z". */
	520	(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
	521	break;
	522
	523	case mmix_operands_resume:
	524	/* Just "Z", like RESUME. */
	525	(*info->fprintf_func) (info->stream, "%d", z);
	526	break;
	527
	528	default:
	529	(info->fprintf_func) (info->stream, _("unknown operands type: %d*"),
	530	opcodep->operands);
	531	break;
	532	}
	533
	534	return 4;
	535	}