/src/binutils-gdb/opcodes/mmix-dis.c

Source
/* mmix-dis.c -- Disassemble MMIX instructions.
   Copyright (C) 2000-2026 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;
}

Coverage Report

Created: 2026-03-10 08:46

Line	Count	Source
1		/* mmix-dis.c -- Disassemble MMIX instructions.
2		Copyright (C) 2000-2026 Free Software Foundation, Inc.
3		Written by Hans-Peter Nilsson (hp@bitrange.com)
4
5		This file is part of the GNU opcodes library.
6
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.
11
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.
16
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. */
21
22		#include "sysdep.h"
23		#include <stdio.h>
24		#include "opcode/mmix.h"
25		#include "disassemble.h"
26		#include "libiberty.h"
27		#include "bfd.h"
28		#include "opintl.h"
29
30		#define BAD_CASE(x) \
31	0	do \
32	0	{ \
33	0	opcodes_error_handler (_("bad case %d (%s) in %s:%d"), \
34	0	x, #x, __FILE__, __LINE__); \
35	0	abort (); \
36	0	} \
37	0	while (0)
38
39		#define FATAL_DEBUG \
40	0	do \
41	0	{ \
42	0	opcodes_error_handler (_("internal: non-debugged code " \
43	0	"(test-case missing): %s:%d"), \
44	0	__FILE__, __LINE__); \
45	0	abort (); \
46	0	} \
47	0	while (0)
48
49		#define ROUND_MODE(n) \
50	708	((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \
51	498	(n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \
52	199	_("(unknown)"))
53
54	40.3k	#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
55	9.54k	#define INSN_BACKWARD_OFFSET_BIT (1 << 24)
56
57	194k	#define MAX_REG_NAME_LEN 256
58	391	#define MAX_SPEC_REG_NAME_LEN 32
59		struct mmix_dis_info
60		{
61		const char *reg_name[MAX_REG_NAME_LEN];
62		const char *spec_reg_name[MAX_SPEC_REG_NAME_LEN];
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[MAX_REG_NAME_LEN][sizeof ("$255")];
68		};
69
70		/* Initialize a target-specific array in INFO. */
71
72		static bool
73		initialize_mmix_dis_info (struct disassemble_info *info)
74	208	{
75	208	struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
76	208	long i;
77
78	208	if (minfop == NULL)
79	0	return false;
80
81	208	memset (minfop, 0, sizeof (*minfop));
82
83		/* Initialize register names from register symbols. If there's no
84		register section, then there are no register symbols. */
85	208	if ((info->section != NULL && info->section->owner != NULL)
86	185	\|\| (info->symbols != NULL
87	0	&& info->symbols[0] != NULL
88	0	&& bfd_asymbol_bfd (info->symbols[0]) != NULL))
89	23	{
90	23	bfd *abfd = info->section && info->section->owner != NULL
91	23	? info->section->owner
92	23	: bfd_asymbol_bfd (info->symbols[0]);
93	23	asection reg_section = bfd_get_section_by_name (abfd, "REG*");
94
95	23	if (reg_section != NULL)
96	20	{
97		/* The returned symcount does include the ending NULL. */
98	20	long symsize = bfd_get_symtab_upper_bound (abfd);
99	20	asymbol **syms = malloc (symsize);
100	20	long nsyms;
101
102	20	if (syms == NULL)
103	0	{
104	0	FATAL_DEBUG;
105	0	free (minfop);
106	0	return false;
107	0	}
108	20	nsyms = bfd_canonicalize_symtab (abfd, syms);
109
110		/* We use the first name for a register. If this is MMO, then
111		it's the name with the first sequence number, presumably the
112		first in the source. */
113	1.16k	for (i = 0; i < nsyms && syms[i] != NULL; i++)
114	1.14k	{
115	1.14k	if (syms[i]->section == reg_section
116	256	&& syms[i]->value < MAX_REG_NAME_LEN
117	256	&& minfop->reg_name[syms[i]->value] == NULL)
118	54	minfop->reg_name[syms[i]->value] = syms[i]->name;
119	1.14k	}
120	20	free (syms);
121	20	}
122	23	}
123
124		/* Fill in the rest with the canonical names. */
125	53.4k	for (i = 0; i < MAX_REG_NAME_LEN; i++)
126	53.2k	if (minfop->reg_name[i] == NULL)
127	53.1k	{
128	53.1k	sprintf (minfop->basic_reg_name[i], "$%ld", i);
129	53.1k	minfop->reg_name[i] = minfop->basic_reg_name[i];
130	53.1k	}
131
132		/* We assume it's actually a one-to-one mapping of number-to-name. */
133	6.86k	for (i = 0; mmix_spec_regs[i].name != NULL; i++)
134	6.65k	minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;
135
136	208	info->private_data = (void *) minfop;
137	208	return true;
138	208	}
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 *
148		get_opcode (unsigned long insn)
149	103k	{
150	103k	static const struct mmix_opcode **opcodes = NULL;
151	103k	const struct mmix_opcode *opcodep = mmix_opcodes;
152	103k	unsigned int opcode_part = (insn >> 24) & 255;
153
154	103k	if (opcodes == NULL)
155	2	opcodes = xcalloc (256, sizeof (struct mmix_opcode *));
156
157	103k	opcodep = opcodes[opcode_part];
158	103k	if (opcodep == NULL
159	23.1k	\|\| (opcodep->match & insn) != opcodep->match
160	23.1k	\|\| (opcodep->lose & insn) != 0)
161	80.6k	{
162		/* Search through the table. */
163	6.07M	for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
164	6.06M	{
165		/* FIXME: Break out this into an initialization function. */
166	6.06M	if ((opcodep->match & (opcode_part << 24)) == opcode_part
167	2	&& (opcodep->lose & (opcode_part << 24)) == 0)
168	2	opcodes[opcode_part] = opcodep;
169
170	6.06M	if ((opcodep->match & insn) == opcodep->match
171	2.68M	&& (opcodep->lose & insn) == 0)
172	77.1k	break;
173	6.06M	}
174	80.6k	}
175
176	103k	if (opcodep->name == NULL)
177	3.53k	return NULL;
178
179		/* Check constraints. If they don't match, loop through the next opcode
180		entries. */
181	100k	do
182	100k	{
183	100k	switch (opcodep->operands)
184	100k	{
185		/* These have no restraint on what can be in the lower three
186		bytes. */
187	9.73k	case mmix_operands_regs:
188	12.7k	case mmix_operands_reg_yz:
189	22.1k	case mmix_operands_regs_z_opt:
190	47.2k	case mmix_operands_regs_z:
191	47.7k	case mmix_operands_jmp:
192	48.6k	case mmix_operands_pushgo:
193	49.0k	case mmix_operands_pop:
194	49.6k	case mmix_operands_sync:
195	51.4k	case mmix_operands_x_regs_z:
196	52.8k	case mmix_operands_neg:
197	53.6k	case mmix_operands_pushj:
198	61.8k	case mmix_operands_regaddr:
199	61.9k	case mmix_operands_get:
200	62.1k	case mmix_operands_set:
201	62.4k	case mmix_operands_save:
202	62.4k	case mmix_operands_unsave:
203	94.8k	case mmix_operands_xyz_opt:
204	94.8k	return opcodep;
205
206		/* For a ROUND_MODE, the middle byte must be 0..4. */
207	3.58k	case mmix_operands_roundregs_z:
208	5.06k	case mmix_operands_roundregs:
209	5.06k	{
210	5.06k	int midbyte = (insn >> 8) & 255;
211
212	5.06k	if (midbyte <= 4)
213	1.93k	return opcodep;
214	5.06k	}
215	3.12k	break;
216
217	3.12k	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	279	if ((insn & INSN_IMMEDIATE_BIT)
221	104	\|\| ((insn >> 16) & 255) < 32)
222	260	return opcodep;
223	19	break;
224
225	90	case mmix_operands_resume:
226		/* Middle bytes must be zero. */
227	90	if ((insn & 0x00ffff00) == 0)
228	90	return opcodep;
229	0	break;
230
231	0	default:
232	0	BAD_CASE (opcodep->operands);
233	100k	}
234
235	3.14k	opcodep++;
236	3.14k	}
237	100k	while ((opcodep->match & insn) == opcodep->match
238	0	&& (opcodep->lose & insn) == 0);
239
240		/* If we got here, we had no match. */
241	3.14k	return NULL;
242	100k	}
243
244		static inline const char *
245		get_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
246	139k	{
247	139k	if (x >= MAX_REG_NAME_LEN)
248	0	return _("illegal");
249	139k	return minfop->reg_name[x];
250	139k	}
251
252		static inline const char *
253		get_spec_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
254	391	{
255	391	if (x >= MAX_SPEC_REG_NAME_LEN)
256	57	return _("illegal");
257	334	return minfop->spec_reg_name[x];
258	391	}
259
260		/* The main disassembly function. */
261
262		int
263		print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
264	103k	{
265	103k	unsigned char buffer[4];
266	103k	unsigned long insn;
267	103k	unsigned int x, y, z;
268	103k	const struct mmix_opcode *opcodep;
269	103k	int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
270	103k	struct mmix_dis_info *minfop;
271
272	103k	if (status != 0)
273	131	{
274	131	(*info->memory_error_func) (status, memaddr, info);
275	131	return -1;
276	131	}
277
278		/* FIXME: Is -1 suitable? */
279	103k	if (info->private_data == NULL
280	208	&& ! initialize_mmix_dis_info (info))
281	0	return -1;
282
283	103k	minfop = (struct mmix_dis_info *) info->private_data;
284	103k	x = buffer[1];
285	103k	y = buffer[2];
286	103k	z = buffer[3];
287
288	103k	insn = bfd_getb32 (buffer);
289
290	103k	opcodep = get_opcode (insn);
291
292	103k	if (opcodep == NULL)
293	6.67k	{
294	6.67k	(info->fprintf_func) (info->stream, _("unknown*"));
295	6.67k	return 4;
296	6.67k	}
297
298	97.0k	(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
299
300		/* Present bytes in the order they are laid out in memory. */
301	97.0k	info->display_endian = BFD_ENDIAN_BIG;
302
303	97.0k	info->insn_info_valid = 1;
304	97.0k	info->bytes_per_chunk = 4;
305	97.0k	info->branch_delay_insns = 0;
306	97.0k	info->target = 0;
307	97.0k	switch (opcodep->type)
308	97.0k	{
309	43.7k	case mmix_type_normal:
310	45.4k	case mmix_type_memaccess_block:
311	45.4k	info->insn_type = dis_nonbranch;
312	45.4k	break;
313
314	1.28k	case mmix_type_branch:
315	1.28k	info->insn_type = dis_branch;
316	1.28k	break;
317
318	8.01k	case mmix_type_condbranch:
319	8.01k	info->insn_type = dis_condbranch;
320	8.01k	break;
321
322	2.71k	case mmix_type_memaccess_octa:
323	2.71k	info->insn_type = dis_dref;
324	2.71k	info->data_size = 8;
325	2.71k	break;
326
327	2.69k	case mmix_type_memaccess_tetra:
328	2.69k	info->insn_type = dis_dref;
329	2.69k	info->data_size = 4;
330	2.69k	break;
331
332	1.25k	case mmix_type_memaccess_wyde:
333	1.25k	info->insn_type = dis_dref;
334	1.25k	info->data_size = 2;
335	1.25k	break;
336
337	2.59k	case mmix_type_memaccess_byte:
338	2.59k	info->insn_type = dis_dref;
339	2.59k	info->data_size = 1;
340	2.59k	break;
341
342	33.1k	case mmix_type_jsr:
343	33.1k	info->insn_type = dis_jsr;
344	33.1k	break;
345
346	0	default:
347	0	BAD_CASE(opcodep->type);
348	97.0k	}
349
350	97.0k	switch (opcodep->operands)
351	97.0k	{
352	9.73k	case mmix_operands_regs:
353		/* All registers: "$X,$Y,$Z". */
354	9.73k	(*info->fprintf_func) (info->stream, "%s,%s,%s",
355	9.73k	get_reg_name (minfop, x),
356	9.73k	get_reg_name (minfop, y),
357	9.73k	get_reg_name (minfop, z));
358	9.73k	break;
359
360	2.97k	case mmix_operands_reg_yz:
361		/* Like SETH - "$X,YZ". */
362	2.97k	(*info->fprintf_func) (info->stream, "%s,0x%x",
363	2.97k	get_reg_name (minfop, x), y * 256 + z);
364	2.97k	break;
365
366	9.48k	case mmix_operands_regs_z_opt:
367	34.5k	case mmix_operands_regs_z:
368	35.3k	case mmix_operands_pushgo:
369		/* The regular "$X,$Y,$Z\|Z". */
370	35.3k	if (insn & INSN_IMMEDIATE_BIT)
371	16.5k	(*info->fprintf_func) (info->stream, "%s,%s,%d",
372	16.5k	get_reg_name (minfop, x),
373	16.5k	get_reg_name (minfop, y), z);
374	18.8k	else
375	18.8k	(*info->fprintf_func) (info->stream, "%s,%s,%s",
376	18.8k	get_reg_name (minfop, x),
377	18.8k	get_reg_name (minfop, y),
378	18.8k	get_reg_name (minfop, z));
379	35.3k	break;
380
381	563	case mmix_operands_jmp:
382		/* Address; only JMP. */
383	563	{
384	563	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
385
386	563	if (insn & INSN_BACKWARD_OFFSET_BIT)
387	301	offset -= (256 * 65536) * 4;
388
389	563	info->target = memaddr + offset;
390	563	(*info->print_address_func) (memaddr + offset, info);
391	563	}
392	563	break;
393
394	1.26k	case mmix_operands_roundregs_z:
395		/* Two registers, like FLOT, possibly with rounding: "$X,$Z\|Z"
396		"$X,ROUND_MODE,$Z\|Z". */
397	1.26k	if (y != 0)
398	324	{
399	324	if (insn & INSN_IMMEDIATE_BIT)
400	112	(*info->fprintf_func) (info->stream, "%s,%s,%d",
401	112	get_reg_name (minfop, x),
402	112	ROUND_MODE (y), z);
403	212	else
404	212	(*info->fprintf_func) (info->stream, "%s,%s,%s",
405	212	get_reg_name (minfop, x),
406	212	ROUND_MODE (y),
407	212	get_reg_name (minfop, z));
408	324	}
409	942	else
410	942	{
411	942	if (insn & INSN_IMMEDIATE_BIT)
412	676	(*info->fprintf_func) (info->stream, "%s,%d",
413	676	get_reg_name (minfop, x), z);
414	266	else
415	266	(*info->fprintf_func) (info->stream, "%s,%s",
416	266	get_reg_name (minfop, x),
417	266	get_reg_name (minfop, z));
418	942	}
419	1.26k	break;
420
421	369	case mmix_operands_pop:
422		/* Like POP - "X,YZ". */
423	369	(info->fprintf_func) (info->stream, "%d,%d", x, y256 + z);
424	369	break;
425
426	670	case mmix_operands_roundregs:
427		/* Two registers, possibly with rounding: "$X,$Z" or
428		"$X,ROUND_MODE,$Z". */
429	670	if (y != 0)
430	384	(*info->fprintf_func) (info->stream, "%s,%s,%s",
431	384	get_reg_name (minfop, x),
432	384	ROUND_MODE (y),
433	384	get_reg_name (minfop, z));
434	286	else
435	286	(*info->fprintf_func) (info->stream, "%s,%s",
436	286	get_reg_name (minfop, x),
437	286	get_reg_name (minfop, z));
438	670	break;
439
440	673	case mmix_operands_sync:
441		/* Like SYNC - "XYZ". */
442	673	(*info->fprintf_func) (info->stream, "%u",
443	673	x * 65536 + y * 256 + z);
444	673	break;
445
446	1.77k	case mmix_operands_x_regs_z:
447		/* Like SYNCD - "X,$Y,$Z\|Z". */
448	1.77k	if (insn & INSN_IMMEDIATE_BIT)
449	675	(*info->fprintf_func) (info->stream, "%d,%s,%d",
450	675	x, get_reg_name (minfop, y), z);
451	1.09k	else
452	1.09k	(*info->fprintf_func) (info->stream, "%d,%s,%s",
453	1.09k	x, get_reg_name (minfop, y),
454	1.09k	get_reg_name (minfop, z));
455	1.77k	break;
456
457	1.42k	case mmix_operands_neg:
458		/* Like NEG and NEGU - "$X,Y,$Z\|Z". */
459	1.42k	if (insn & INSN_IMMEDIATE_BIT)
460	619	(*info->fprintf_func) (info->stream, "%s,%d,%d",
461	619	get_reg_name (minfop, x), y, z);
462	806	else
463	806	(*info->fprintf_func) (info->stream, "%s,%d,%s",
464	806	get_reg_name (minfop, x), y,
465	806	get_reg_name (minfop, z));
466	1.42k	break;
467
468	802	case mmix_operands_pushj:
469	8.98k	case mmix_operands_regaddr:
470		/* Like GETA or branches - "$X,Address". */
471	8.98k	{
472	8.98k	bfd_signed_vma offset = (y * 256 + z) * 4;
473
474	8.98k	if (insn & INSN_BACKWARD_OFFSET_BIT)
475	4.93k	offset -= 65536 * 4;
476
477	8.98k	info->target = memaddr + offset;
478
479	8.98k	(*info->fprintf_func) (info->stream, "%s,", get_reg_name (minfop, x));
480	8.98k	(*info->print_address_func) (memaddr + offset, info);
481	8.98k	}
482	8.98k	break;
483
484	131	case mmix_operands_get:
485		/* GET - "X,spec_reg". */
486	131	(*info->fprintf_func) (info->stream, "%s,%s",
487	131	get_reg_name (minfop, x),
488	131	get_spec_reg_name (minfop, z));
489	131	break;
490
491	260	case mmix_operands_put:
492		/* PUT - "spec_reg,$Z\|Z". */
493	260	if (insn & INSN_IMMEDIATE_BIT)
494	175	(*info->fprintf_func) (info->stream, "%s,%d",
495	175	get_spec_reg_name (minfop, x), z);
496	85	else
497	85	(*info->fprintf_func) (info->stream, "%s,%s",
498	85	get_spec_reg_name (minfop, x),
499	85	get_reg_name (minfop, z));
500	260	break;
501
502	136	case mmix_operands_set:
503		/* Two registers, "$X,$Y". */
504	136	(*info->fprintf_func) (info->stream, "%s,%s",
505	136	get_reg_name (minfop, x),
506	136	get_reg_name (minfop, y));
507	136	break;
508
509	308	case mmix_operands_save:
510		/* SAVE - "$X,0". */
511	308	(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
512	308	break;
513
514	17	case mmix_operands_unsave:
515		/* UNSAVE - "0,$Z". */
516	17	(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
517	17	break;
518
519	32.3k	case mmix_operands_xyz_opt:
520		/* Like SWYM or TRAP - "X,Y,Z". */
521	32.3k	(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
522	32.3k	break;
523
524	90	case mmix_operands_resume:
525		/* Just "Z", like RESUME. */
526	90	(*info->fprintf_func) (info->stream, "%d", z);
527	90	break;
528
529	0	default:
530	0	(info->fprintf_func) (info->stream, _("unknown operands type: %d*"),
531	0	opcodep->operands);
532	0	break;
533	97.0k	}
534
535	97.0k	return 4;
536	97.0k	}