/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: 2026-07-12 09:22

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	2.02k	((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \
51	1.60k	(n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \
52	483	_("(unknown)"))
53
54	66.5k	#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
55	14.1k	#define INSN_BACKWARD_OFFSET_BIT (1 << 24)
56
57	299k	#define MAX_REG_NAME_LEN 256
58	880	#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 ("$255")];
68		};
69
70		/* Initialize a target-specific array in INFO. */
71
72		static bool
73		initialize_mmix_dis_info (struct disassemble_info *info)
74	277	{
75	277	struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
76	277	long i;
77
78	277	if (minfop == NULL)
79	0	return false;
80
81	277	memset (minfop, 0, sizeof (*minfop));
82
83		/* Initialize register names from register symbols. If there's no
84		register section, then there are no register symbols. */
85	277	if ((info->section != NULL && info->section->owner != NULL)
86	241	\|\| (info->symbols != NULL
87	0	&& info->symbols[0] != NULL
88	0	&& bfd_asymbol_bfd (info->symbols[0]) != NULL))
89	36	{
90	36	bfd *abfd = info->section && info->section->owner != NULL
91	36	? info->section->owner
92	36	: bfd_asymbol_bfd (info->symbols[0]);
93	36	asection reg_section = bfd_get_section_by_name (abfd, "REG*");
94
95	36	if (reg_section != NULL)
96	18	{
97		/* The returned symcount does include the ending NULL. */
98	18	long symsize = bfd_get_symtab_upper_bound (abfd);
99	18	asymbol **syms = malloc (symsize);
100	18	long nsyms;
101
102	18	if (syms == NULL)
103	0	{
104	0	FATAL_DEBUG;
105	0	free (minfop);
106	0	return false;
107	0	}
108	18	nsyms = bfd_canonicalize_symtab (abfd, syms);
109
110		/* We use the first name for a register. If this is MMO, then
111		it's the name with the first sequence number, presumably the
112		first in the source. */
113	1.21k	for (i = 0; i < nsyms && syms[i] != NULL; i++)
114	1.19k	{
115	1.19k	if (syms[i]->section == reg_section
116	274	&& syms[i]->value < MAX_REG_NAME_LEN
117	274	&& minfop->reg_name[syms[i]->value] == NULL)
118	53	minfop->reg_name[syms[i]->value] = syms[i]->name;
119	1.19k	}
120	18	free (syms);
121	18	}
122	36	}
123
124		/* Fill in the rest with the canonical names. */
125	71.1k	for (i = 0; i < MAX_REG_NAME_LEN; i++)
126	70.9k	if (minfop->reg_name[i] == NULL)
127	70.8k	{
128	70.8k	sprintf (minfop->basic_reg_name[i], "$%ld", i);
129	70.8k	minfop->reg_name[i] = minfop->basic_reg_name[i];
130	70.8k	}
131
132		/* We assume it's actually a one-to-one mapping of number-to-name. */
133	9.14k	for (i = 0; mmix_spec_regs[i].name != NULL; i++)
134	8.86k	minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;
135
136	277	info->private_data = (void *) minfop;
137	277	return true;
138	277	}
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	168k	{
150	168k	static const struct mmix_opcode **opcodes = NULL;
151	168k	const struct mmix_opcode *opcodep = mmix_opcodes;
152	168k	unsigned int opcode_part = (insn >> 24) & 255;
153
154	168k	if (opcodes == NULL)
155	2	opcodes = xcalloc (256, sizeof (struct mmix_opcode *));
156
157	168k	opcodep = opcodes[opcode_part];
158	168k	if (opcodep == NULL
159	36.0k	\|\| (opcodep->match & insn) != opcodep->match
160	36.0k	\|\| (opcodep->lose & insn) != 0)
161	132k	{
162		/* Search through the table. */
163	9.85M	for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
164	9.85M	{
165		/* FIXME: Break out this into an initialization function. */
166	9.85M	if ((opcodep->match & (opcode_part << 24)) == opcode_part
167	2	&& (opcodep->lose & (opcode_part << 24)) == 0)
168	2	opcodes[opcode_part] = opcodep;
169
170	9.85M	if ((opcodep->match & insn) == opcodep->match
171	4.24M	&& (opcodep->lose & insn) == 0)
172	126k	break;
173	9.85M	}
174	132k	}
175
176	168k	if (opcodep->name == NULL)
177	5.74k	return NULL;
178
179		/* Check constraints. If they don't match, loop through the next opcode
180		entries. */
181	162k	do
182	162k	{
183	162k	switch (opcodep->operands)
184	162k	{
185		/* These have no restraint on what can be in the lower three
186		bytes. */
187	15.8k	case mmix_operands_regs:
188	20.4k	case mmix_operands_reg_yz:
189	35.3k	case mmix_operands_regs_z_opt:
190	77.1k	case mmix_operands_regs_z:
191	78.8k	case mmix_operands_jmp:
192	79.5k	case mmix_operands_pushgo:
193	80.2k	case mmix_operands_pop:
194	81.2k	case mmix_operands_sync:
195	84.9k	case mmix_operands_x_regs_z:
196	87.1k	case mmix_operands_neg:
197	88.0k	case mmix_operands_pushj:
198	99.6k	case mmix_operands_regaddr:
199	99.9k	case mmix_operands_get:
200	100k	case mmix_operands_set:
201	100k	case mmix_operands_save:
202	100k	case mmix_operands_unsave:
203	151k	case mmix_operands_xyz_opt:
204	151k	return opcodep;
205
206		/* For a ROUND_MODE, the middle byte must be 0..4. */
207	6.87k	case mmix_operands_roundregs_z:
208	10.4k	case mmix_operands_roundregs:
209	10.4k	{
210	10.4k	int midbyte = (insn >> 8) & 255;
211
212	10.4k	if (midbyte <= 4)
213	3.71k	return opcodep;
214	10.4k	}
215	6.69k	break;
216
217	6.69k	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	666	if ((insn & INSN_IMMEDIATE_BIT)
221	451	\|\| ((insn >> 16) & 255) < 32)
222	527	return opcodep;
223	139	break;
224
225	255	case mmix_operands_resume:
226		/* Middle bytes must be zero. */
227	255	if ((insn & 0x00ffff00) == 0)
228	255	return opcodep;
229	0	break;
230
231	0	default:
232	0	BAD_CASE (opcodep->operands);
233	162k	}
234
235	6.83k	opcodep++;
236	6.83k	}
237	162k	while ((opcodep->match & insn) == opcodep->match
238	0	&& (opcodep->lose & insn) == 0);
239
240		/* If we got here, we had no match. */
241	6.83k	return NULL;
242	162k	}
243
244		static inline const char *
245		get_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
246	227k	{
247	227k	if (x >= MAX_REG_NAME_LEN)
248	0	return _("illegal");
249	227k	return minfop->reg_name[x];
250	227k	}
251
252		static inline const char *
253		get_spec_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
254	880	{
255	880	if (x >= MAX_SPEC_REG_NAME_LEN)
256	124	return _("illegal");
257	756	return minfop->spec_reg_name[x];
258	880	}
259
260		/* The main disassembly function. */
261
262		int
263		print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
264	168k	{
265	168k	unsigned char buffer[4];
266	168k	unsigned long insn;
267	168k	unsigned int x, y, z;
268	168k	const struct mmix_opcode *opcodep;
269	168k	int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
270	168k	struct mmix_dis_info *minfop;
271
272	168k	if (status != 0)
273	178	{
274	178	(*info->memory_error_func) (status, memaddr, info);
275	178	return -1;
276	178	}
277
278		/* FIXME: Is -1 suitable? */
279	168k	if (info->private_data == NULL
280	277	&& ! initialize_mmix_dis_info (info))
281	0	return -1;
282
283	168k	minfop = (struct mmix_dis_info *) info->private_data;
284	168k	x = buffer[1];
285	168k	y = buffer[2];
286	168k	z = buffer[3];
287
288	168k	insn = bfd_getb32 (buffer);
289
290	168k	opcodep = get_opcode (insn);
291
292	168k	if (opcodep == NULL)
293	12.5k	{
294	12.5k	(info->fprintf_func) (info->stream, _("unknown*"));
295	12.5k	return 4;
296	12.5k	}
297
298	155k	(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
299
300		/* Present bytes in the order they are laid out in memory. */
301	155k	info->display_endian = BFD_ENDIAN_BIG;
302
303	155k	info->insn_info_valid = 1;
304	155k	info->bytes_per_chunk = 4;
305	155k	info->branch_delay_insns = 0;
306	155k	info->target = 0;
307	155k	switch (opcodep->type)
308	155k	{
309	72.9k	case mmix_type_normal:
310	76.2k	case mmix_type_memaccess_block:
311	76.2k	info->insn_type = dis_nonbranch;
312	76.2k	break;
313
314	2.93k	case mmix_type_branch:
315	2.93k	info->insn_type = dis_branch;
316	2.93k	break;
317
318	11.1k	case mmix_type_condbranch:
319	11.1k	info->insn_type = dis_condbranch;
320	11.1k	break;
321
322	4.29k	case mmix_type_memaccess_octa:
323	4.29k	info->insn_type = dis_dref;
324	4.29k	info->data_size = 8;
325	4.29k	break;
326
327	3.65k	case mmix_type_memaccess_tetra:
328	3.65k	info->insn_type = dis_dref;
329	3.65k	info->data_size = 4;
330	3.65k	break;
331
332	1.39k	case mmix_type_memaccess_wyde:
333	1.39k	info->insn_type = dis_dref;
334	1.39k	info->data_size = 2;
335	1.39k	break;
336
337	5.41k	case mmix_type_memaccess_byte:
338	5.41k	info->insn_type = dis_dref;
339	5.41k	info->data_size = 1;
340	5.41k	break;
341
342	50.5k	case mmix_type_jsr:
343	50.5k	info->insn_type = dis_jsr;
344	50.5k	break;
345
346	0	default:
347	0	BAD_CASE(opcodep->type);
348	155k	}
349
350	155k	switch (opcodep->operands)
351	155k	{
352	15.8k	case mmix_operands_regs:
353		/* All registers: "$X,$Y,$Z". */
354	15.8k	(*info->fprintf_func) (info->stream, "%s,%s,%s",
355	15.8k	get_reg_name (minfop, x),
356	15.8k	get_reg_name (minfop, y),
357	15.8k	get_reg_name (minfop, z));
358	15.8k	break;
359
360	4.53k	case mmix_operands_reg_yz:
361		/* Like SETH - "$X,YZ". */
362	4.53k	(*info->fprintf_func) (info->stream, "%s,0x%x",
363	4.53k	get_reg_name (minfop, x), y * 256 + z);
364	4.53k	break;
365
366	14.9k	case mmix_operands_regs_z_opt:
367	56.6k	case mmix_operands_regs_z:
368	57.3k	case mmix_operands_pushgo:
369		/* The regular "$X,$Y,$Z\|Z". */
370	57.3k	if (insn & INSN_IMMEDIATE_BIT)
371	26.7k	(*info->fprintf_func) (info->stream, "%s,%s,%d",
372	26.7k	get_reg_name (minfop, x),
373	26.7k	get_reg_name (minfop, y), z);
374	30.6k	else
375	30.6k	(*info->fprintf_func) (info->stream, "%s,%s,%s",
376	30.6k	get_reg_name (minfop, x),
377	30.6k	get_reg_name (minfop, y),
378	30.6k	get_reg_name (minfop, z));
379	57.3k	break;
380
381	1.68k	case mmix_operands_jmp:
382		/* Address; only JMP. */
383	1.68k	{
384	1.68k	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
385
386	1.68k	if (insn & INSN_BACKWARD_OFFSET_BIT)
387	816	offset -= (256 * 65536) * 4;
388
389	1.68k	info->target = memaddr + offset;
390	1.68k	(*info->print_address_func) (memaddr + offset, info);
391	1.68k	}
392	1.68k	break;
393
394	2.07k	case mmix_operands_roundregs_z:
395		/* Two registers, like FLOT, possibly with rounding: "$X,$Z\|Z"
396		"$X,ROUND_MODE,$Z\|Z". */
397	2.07k	if (y != 0)
398	819	{
399	819	if (insn & INSN_IMMEDIATE_BIT)
400	448	(*info->fprintf_func) (info->stream, "%s,%s,%d",
401	448	get_reg_name (minfop, x),
402	448	ROUND_MODE (y), z);
403	371	else
404	371	(*info->fprintf_func) (info->stream, "%s,%s,%s",
405	371	get_reg_name (minfop, x),
406	371	ROUND_MODE (y),
407	371	get_reg_name (minfop, z));
408	819	}
409	1.25k	else
410	1.25k	{
411	1.25k	if (insn & INSN_IMMEDIATE_BIT)
412	769	(*info->fprintf_func) (info->stream, "%s,%d",
413	769	get_reg_name (minfop, x), z);
414	487	else
415	487	(*info->fprintf_func) (info->stream, "%s,%s",
416	487	get_reg_name (minfop, x),
417	487	get_reg_name (minfop, z));
418	1.25k	}
419	2.07k	break;
420
421	735	case mmix_operands_pop:
422		/* Like POP - "X,YZ". */
423	735	(info->fprintf_func) (info->stream, "%d,%d", x, y256 + z);
424	735	break;
425
426	1.64k	case mmix_operands_roundregs:
427		/* Two registers, possibly with rounding: "$X,$Z" or
428		"$X,ROUND_MODE,$Z". */
429	1.64k	if (y != 0)
430	1.20k	(*info->fprintf_func) (info->stream, "%s,%s,%s",
431	1.20k	get_reg_name (minfop, x),
432	1.20k	ROUND_MODE (y),
433	1.20k	get_reg_name (minfop, z));
434	433	else
435	433	(*info->fprintf_func) (info->stream, "%s,%s",
436	433	get_reg_name (minfop, x),
437	433	get_reg_name (minfop, z));
438	1.64k	break;
439
440	1.01k	case mmix_operands_sync:
441		/* Like SYNC - "XYZ". */
442	1.01k	(*info->fprintf_func) (info->stream, "%u",
443	1.01k	x * 65536 + y * 256 + z);
444	1.01k	break;
445
446	3.70k	case mmix_operands_x_regs_z:
447		/* Like SYNCD - "X,$Y,$Z\|Z". */
448	3.70k	if (insn & INSN_IMMEDIATE_BIT)
449	1.10k	(*info->fprintf_func) (info->stream, "%d,%s,%d",
450	1.10k	x, get_reg_name (minfop, y), z);
451	2.59k	else
452	2.59k	(*info->fprintf_func) (info->stream, "%d,%s,%s",
453	2.59k	x, get_reg_name (minfop, y),
454	2.59k	get_reg_name (minfop, z));
455	3.70k	break;
456
457	2.22k	case mmix_operands_neg:
458		/* Like NEG and NEGU - "$X,Y,$Z\|Z". */
459	2.22k	if (insn & INSN_IMMEDIATE_BIT)
460	1.12k	(*info->fprintf_func) (info->stream, "%s,%d,%d",
461	1.12k	get_reg_name (minfop, x), y, z);
462	1.09k	else
463	1.09k	(*info->fprintf_func) (info->stream, "%s,%d,%s",
464	1.09k	get_reg_name (minfop, x), y,
465	1.09k	get_reg_name (minfop, z));
466	2.22k	break;
467
468	924	case mmix_operands_pushj:
469	12.4k	case mmix_operands_regaddr:
470		/* Like GETA or branches - "$X,Address". */
471	12.4k	{
472	12.4k	bfd_signed_vma offset = (y * 256 + z) * 4;
473
474	12.4k	if (insn & INSN_BACKWARD_OFFSET_BIT)
475	5.79k	offset -= 65536 * 4;
476
477	12.4k	info->target = memaddr + offset;
478
479	12.4k	(*info->fprintf_func) (info->stream, "%s,", get_reg_name (minfop, x));
480	12.4k	(*info->print_address_func) (memaddr + offset, info);
481	12.4k	}
482	12.4k	break;
483
484	353	case mmix_operands_get:
485		/* GET - "X,spec_reg". */
486	353	(*info->fprintf_func) (info->stream, "%s,%s",
487	353	get_reg_name (minfop, x),
488	353	get_spec_reg_name (minfop, z));
489	353	break;
490
491	527	case mmix_operands_put:
492		/* PUT - "spec_reg,$Z\|Z". */
493	527	if (insn & INSN_IMMEDIATE_BIT)
494	215	(*info->fprintf_func) (info->stream, "%s,%d",
495	215	get_spec_reg_name (minfop, x), z);
496	312	else
497	312	(*info->fprintf_func) (info->stream, "%s,%s",
498	312	get_spec_reg_name (minfop, x),
499	312	get_reg_name (minfop, z));
500	527	break;
501
502	331	case mmix_operands_set:
503		/* Two registers, "$X,$Y". */
504	331	(*info->fprintf_func) (info->stream, "%s,%s",
505	331	get_reg_name (minfop, x),
506	331	get_reg_name (minfop, y));
507	331	break;
508
509	623	case mmix_operands_save:
510		/* SAVE - "$X,0". */
511	623	(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
512	623	break;
513
514	56	case mmix_operands_unsave:
515		/* UNSAVE - "0,$Z". */
516	56	(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
517	56	break;
518
519	50.1k	case mmix_operands_xyz_opt:
520		/* Like SWYM or TRAP - "X,Y,Z". */
521	50.1k	(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
522	50.1k	break;
523
524	255	case mmix_operands_resume:
525		/* Just "Z", like RESUME. */
526	255	(*info->fprintf_func) (info->stream, "%d", z);
527	255	break;
528
529	0	default:
530	0	(info->fprintf_func) (info->stream, _("unknown operands type: %d*"),
531	0	opcodep->operands);
532	0	break;
533	155k	}
534
535	155k	return 4;
536	155k	}