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

/* mmix-dis.c -- Disassemble MMIX instructions.
   Copyright (C) 2000-2024 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 bool
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;
	    }
	  free (syms);
	}
    }

  /* 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.
fd67aa11	2	Copyright (C) 2000-2024 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
78933a4a	72	static bool
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)
78933a4a	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);
78933a4a	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	}
a1defbe4	120	free (syms);
afd30973 HPN	121	}
	122	}
	123
	124	/* Fill in the rest with the canonical names. */
1e4b5e7d	125	for (i = 0; i < MAX_REG_NAME_LEN; i++)
afd30973 HPN	126	if (minfop->reg_name[i] == NULL)
afd30973 HPN	127	{
91d6fa6a	128	sprintf (minfop->basic_reg_name[i], "$%ld", i);
afd30973 HPN	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;
78933a4a	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
1e4b5e7d NC	244	static inline const char *
	245	get_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
	246	{
	247	if (x >= MAX_REG_NAME_LEN)
	248	return _("illegal");
	249	return minfop->reg_name[x];
	250	}
	251
	252	static inline const char *
	253	get_spec_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
	254	{
	255	if (x >= MAX_SPEC_REG_NAME_LEN)
	256	return _("illegal");
	257	return minfop->spec_reg_name[x];
	258	}
	259
afd30973 HPN	260	/* The main disassembly function. */
	261
	262	int
47b0e7ad	263	print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
afd30973 HPN	264	{
	265	unsigned char buffer[4];
	266	unsigned long insn;
	267	unsigned int x, y, z;
	268	const struct mmix_opcode *opcodep;
	269	int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
	270	struct mmix_dis_info *minfop;
	271
	272	if (status != 0)
	273	{
	274	(*info->memory_error_func) (status, memaddr, info);
	275	return -1;
	276	}
	277
	278	/* FIXME: Is -1 suitable? */
	279	if (info->private_data == NULL
	280	&& ! initialize_mmix_dis_info (info))
	281	return -1;
	282
	283	minfop = (struct mmix_dis_info *) info->private_data;
	284	x = buffer[1];
	285	y = buffer[2];
	286	z = buffer[3];
	287
	288	insn = bfd_getb32 (buffer);
	289
	290	opcodep = get_opcode (insn);
	291
	292	if (opcodep == NULL)
	293	{
	294	(info->fprintf_func) (info->stream, _("unknown*"));
	295	return 4;
	296	}
	297
	298	(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
	299
	300	/* Present bytes in the order they are laid out in memory. */
	301	info->display_endian = BFD_ENDIAN_BIG;
	302
	303	info->insn_info_valid = 1;
	304	info->bytes_per_chunk = 4;
	305	info->branch_delay_insns = 0;
	306	info->target = 0;
	307	switch (opcodep->type)
	308	{
	309	case mmix_type_normal:
	310	case mmix_type_memaccess_block:
	311	info->insn_type = dis_nonbranch;
	312	break;
	313
	314	case mmix_type_branch:
	315	info->insn_type = dis_branch;
	316	break;
	317
	318	case mmix_type_condbranch:
	319	info->insn_type = dis_condbranch;
	320	break;
	321
	322	case mmix_type_memaccess_octa:
	323	info->insn_type = dis_dref;
	324	info->data_size = 8;
	325	break;
	326
	327	case mmix_type_memaccess_tetra:
328	info->insn_type = dis_dref;
329	info->data_size = 4;
330	break;
331
332	case mmix_type_memaccess_wyde:
333	info->insn_type = dis_dref;
334	info->data_size = 2;
335	break;
336
337	case mmix_type_memaccess_byte:
338	info->insn_type = dis_dref;
339	info->data_size = 1;
340	break;
341
342	case mmix_type_jsr:
343	info->insn_type = dis_jsr;
344	break;
345
346	default:
347	BAD_CASE(opcodep->type);
348	}
349
350	switch (opcodep->operands)
351	{
352	case mmix_operands_regs:
353	/* All registers: "$X,$Y,$Z". */
354	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d NC	355	get_reg_name (minfop, x),
	356	get_reg_name (minfop, y),
	357	get_reg_name (minfop, z));
afd30973 HPN	358	break;
	359
	360	case mmix_operands_reg_yz:
	361	/* Like SETH - "$X,YZ". */
	362	(*info->fprintf_func) (info->stream, "%s,0x%x",
1e4b5e7d	363	get_reg_name (minfop, x), y * 256 + z);
afd30973 HPN	364	break;
	365
	366	case mmix_operands_regs_z_opt:
	367	case mmix_operands_regs_z:
	368	case mmix_operands_pushgo:
	369	/* The regular "$X,$Y,$Z\|Z". */
	370	if (insn & INSN_IMMEDIATE_BIT)
	371	(*info->fprintf_func) (info->stream, "%s,%s,%d",
1e4b5e7d NC	372	get_reg_name (minfop, x),
1e4b5e7d NC	373	get_reg_name (minfop, y), z);
afd30973 HPN	374	else
afd30973 HPN	375	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d NC	376	get_reg_name (minfop, x),
	377	get_reg_name (minfop, y),
	378	get_reg_name (minfop, z));
afd30973 HPN	379	break;
	380
	381	case mmix_operands_jmp:
	382	/* Address; only JMP. */
	383	{
	384	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
	385
	386	if (insn & INSN_BACKWARD_OFFSET_BIT)
	387	offset -= (256 * 65536) * 4;
	388
	389	info->target = memaddr + offset;
	390	(*info->print_address_func) (memaddr + offset, info);
	391	}
	392	break;
	393
	394	case mmix_operands_roundregs_z:
	395	/* Two registers, like FLOT, possibly with rounding: "$X,$Z\|Z"
	396	"$X,ROUND_MODE,$Z\|Z". */
	397	if (y != 0)
	398	{
	399	if (insn & INSN_IMMEDIATE_BIT)
	400	(*info->fprintf_func) (info->stream, "%s,%s,%d",
1e4b5e7d	401	get_reg_name (minfop, x),
afd30973 HPN	402	ROUND_MODE (y), z);
	403	else
	404	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d	405	get_reg_name (minfop, x),
afd30973	406	ROUND_MODE (y),
1e4b5e7d	407	get_reg_name (minfop, z));
afd30973 HPN	408	}
	409	else
	410	{
	411	if (insn & INSN_IMMEDIATE_BIT)
	412	(*info->fprintf_func) (info->stream, "%s,%d",
1e4b5e7d	413	get_reg_name (minfop, x), z);
afd30973 HPN	414	else
afd30973 HPN	415	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	416	get_reg_name (minfop, x),
1e4b5e7d NC	417	get_reg_name (minfop, z));
afd30973 HPN	418	}
	419	break;
	420
	421	case mmix_operands_pop:
	422	/* Like POP - "X,YZ". */
	423	(info->fprintf_func) (info->stream, "%d,%d", x, y256 + z);
	424	break;
	425
	426	case mmix_operands_roundregs:
	427	/* Two registers, possibly with rounding: "$X,$Z" or
	428	"$X,ROUND_MODE,$Z". */
	429	if (y != 0)
	430	(*info->fprintf_func) (info->stream, "%s,%s,%s",
1e4b5e7d	431	get_reg_name (minfop, x),
afd30973	432	ROUND_MODE (y),
1e4b5e7d	433	get_reg_name (minfop, z));
afd30973 HPN	434	else
afd30973 HPN	435	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	436	get_reg_name (minfop, x),
1e4b5e7d NC	437	get_reg_name (minfop, z));
afd30973 HPN	438	break;
	439
	440	case mmix_operands_sync:
	441	/* Like SYNC - "XYZ". */
	442	(*info->fprintf_func) (info->stream, "%u",
	443	x * 65536 + y * 256 + z);
	444	break;
	445
	446	case mmix_operands_x_regs_z:
	447	/* Like SYNCD - "X,$Y,$Z\|Z". */
	448	if (insn & INSN_IMMEDIATE_BIT)
	449	(*info->fprintf_func) (info->stream, "%d,%s,%d",
1e4b5e7d	450	x, get_reg_name (minfop, y), z);
afd30973 HPN	451	else
afd30973 HPN	452	(*info->fprintf_func) (info->stream, "%d,%s,%s",
1e4b5e7d NC	453	x, get_reg_name (minfop, y),
1e4b5e7d NC	454	get_reg_name (minfop, z));
afd30973 HPN	455	break;
	456
	457	case mmix_operands_neg:
	458	/* Like NEG and NEGU - "$X,Y,$Z\|Z". */
	459	if (insn & INSN_IMMEDIATE_BIT)
	460	(*info->fprintf_func) (info->stream, "%s,%d,%d",
1e4b5e7d	461	get_reg_name (minfop, x), y, z);
afd30973 HPN	462	else
afd30973 HPN	463	(*info->fprintf_func) (info->stream, "%s,%d,%s",
1e4b5e7d NC	464	get_reg_name (minfop, x), y,
1e4b5e7d NC	465	get_reg_name (minfop, z));
afd30973 HPN	466	break;
	467
	468	case mmix_operands_pushj:
	469	case mmix_operands_regaddr:
	470	/* Like GETA or branches - "$X,Address". */
	471	{
	472	bfd_signed_vma offset = (y * 256 + z) * 4;
	473
	474	if (insn & INSN_BACKWARD_OFFSET_BIT)
	475	offset -= 65536 * 4;
	476
	477	info->target = memaddr + offset;
	478
1e4b5e7d	479	(*info->fprintf_func) (info->stream, "%s,", get_reg_name (minfop, x));
afd30973 HPN	480	(*info->print_address_func) (memaddr + offset, info);
	481	}
	482	break;
	483
	484	case mmix_operands_get:
	485	/* GET - "X,spec_reg". */
	486	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	487	get_reg_name (minfop, x),
1e4b5e7d NC	488	get_spec_reg_name (minfop, z));
afd30973 HPN	489	break;
	490
	491	case mmix_operands_put:
	492	/* PUT - "spec_reg,$Z\|Z". */
	493	if (insn & INSN_IMMEDIATE_BIT)
	494	(*info->fprintf_func) (info->stream, "%s,%d",
1e4b5e7d	495	get_spec_reg_name (minfop, x), z);
afd30973 HPN	496	else
afd30973 HPN	497	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	498	get_spec_reg_name (minfop, x),
1e4b5e7d NC	499	get_reg_name (minfop, z));
afd30973 HPN	500	break;
	501
	502	case mmix_operands_set:
	503	/* Two registers, "$X,$Y". */
	504	(*info->fprintf_func) (info->stream, "%s,%s",
1e4b5e7d NC	505	get_reg_name (minfop, x),
1e4b5e7d NC	506	get_reg_name (minfop, y));
afd30973 HPN	507	break;
	508
	509	case mmix_operands_save:
	510	/* SAVE - "$X,0". */
	511	(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
	512	break;
	513
	514	case mmix_operands_unsave:
	515	/* UNSAVE - "0,$Z". */
	516	(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
	517	break;
	518
	519	case mmix_operands_xyz_opt:
	520	/* Like SWYM or TRAP - "X,Y,Z". */
	521	(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
	522	break;
	523
	524	case mmix_operands_resume:
	525	/* Just "Z", like RESUME. */
	526	(*info->fprintf_func) (info->stream, "%d", z);
	527	break;
	528
	529	default:
	530	(info->fprintf_func) (info->stream, _("unknown operands type: %d*"),
	531	opcodep->operands);
	532	break;
	533	}
	534
	535	return 4;
	536	}