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

Source (jump to first uncovered line)
/* mmix-dis.c -- Disassemble MMIX instructions.
   Copyright (C) 2000-2025 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: 2025-07-08 11:15

Line	Count	Source (jump to first uncovered line)
1		/* mmix-dis.c -- Disassemble MMIX instructions.
2		Copyright (C) 2000-2025 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	544	((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \
51	391	(n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \
52	85	_("(unknown)"))
53
54	38.5k	#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
55	9.54k	#define INSN_BACKWARD_OFFSET_BIT (1 << 24)
56
57	196k	#define MAX_REG_NAME_LEN 256
58	285	#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 ("$255")];
68		};
69
70		/* Initialize a target-specific array in INFO. */
71
72		static bool
73		initialize_mmix_dis_info (struct disassemble_info *info)
74	274	{
75	274	struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
76	274	long i;
77
78	274	if (minfop == NULL)
79	0	return false;
80
81	274	memset (minfop, 0, sizeof (*minfop));
82
83		/* Initialize register names from register symbols. If there's no
84		register section, then there are no register symbols. */
85	274	if ((info->section != NULL && info->section->owner != NULL)
86	274	\|\| (info->symbols != NULL
87	262	&& info->symbols[0] != NULL
88	262	&& bfd_asymbol_bfd (info->symbols[0]) != NULL))
89	12	{
90	12	bfd *abfd = info->section && info->section->owner != NULL
91	12	? info->section->owner
92	12	: bfd_asymbol_bfd (info->symbols[0]);
93	12	asection reg_section = bfd_get_section_by_name (abfd, "REG*");
94
95	12	if (reg_section != NULL)
96	12	{
97		/* The returned symcount does include the ending NULL. */
98	12	long symsize = bfd_get_symtab_upper_bound (abfd);
99	12	asymbol **syms = malloc (symsize);
100	12	long nsyms;
101
102	12	if (syms == NULL)
103	0	{
104	0	FATAL_DEBUG;
105	0	free (minfop);
106	0	return false;
107	0	}
108	12	nsyms = bfd_canonicalize_symtab (abfd, syms);
109
110		/* We use the first name for a register. If this is MMO, then
111		it's the name with the first sequence number, presumably the
112		first in the source. */
113	1.10k	for (i = 0; i < nsyms && syms[i] != NULL; i++)
114	1.09k	{
115	1.09k	if (syms[i]->section == reg_section
116	1.09k	&& syms[i]->value < MAX_REG_NAME_LEN
117	1.09k	&& minfop->reg_name[syms[i]->value] == NULL)
118	45	minfop->reg_name[syms[i]->value] = syms[i]->name;
119	1.09k	}
120	12	free (syms);
121	12	}
122	12	}
123
124		/* Fill in the rest with the canonical names. */
125	70.4k	for (i = 0; i < MAX_REG_NAME_LEN; i++)
126	70.1k	if (minfop->reg_name[i] == NULL)
127	70.0k	{
128	70.0k	sprintf (minfop->basic_reg_name[i], "$%ld", i);
129	70.0k	minfop->reg_name[i] = minfop->basic_reg_name[i];
130	70.0k	}
131
132		/* We assume it's actually a one-to-one mapping of number-to-name. */
133	9.04k	for (i = 0; mmix_spec_regs[i].name != NULL; i++)
134	8.76k	minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;
135
136	274	info->private_data = (void *) minfop;
137	274	return true;
138	274	}
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	93.8k	{
150	93.8k	static const struct mmix_opcode **opcodes = NULL;
151	93.8k	const struct mmix_opcode *opcodep = mmix_opcodes;
152	93.8k	unsigned int opcode_part = (insn >> 24) & 255;
153
154	93.8k	if (opcodes == NULL)
155	2	opcodes = xcalloc (256, sizeof (struct mmix_opcode *));
156
157	93.8k	opcodep = opcodes[opcode_part];
158	93.8k	if (opcodep == NULL
159	93.8k	\|\| (opcodep->match & insn) != opcodep->match
160	93.8k	\|\| (opcodep->lose & insn) != 0)
161	73.9k	{
162		/* Search through the table. */
163	5.80M	for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
164	5.79M	{
165		/* FIXME: Break out this into an initialization function. */
166	5.79M	if ((opcodep->match & (opcode_part << 24)) == opcode_part
167	5.79M	&& (opcodep->lose & (opcode_part << 24)) == 0)
168	2	opcodes[opcode_part] = opcodep;
169
170	5.79M	if ((opcodep->match & insn) == opcodep->match
171	5.79M	&& (opcodep->lose & insn) == 0)
172	72.0k	break;
173	5.79M	}
174	73.9k	}
175
176	93.8k	if (opcodep->name == NULL)
177	1.98k	return NULL;
178
179		/* Check constraints. If they don't match, loop through the next opcode
180		entries. */
181	91.8k	do
182	91.8k	{
183	91.8k	switch (opcodep->operands)
184	91.8k	{
185		/* These have no restraint on what can be in the lower three
186		bytes. */
187	6.39k	case mmix_operands_regs:
188	9.60k	case mmix_operands_reg_yz:
189	18.7k	case mmix_operands_regs_z_opt:
190	42.7k	case mmix_operands_regs_z:
191	44.1k	case mmix_operands_jmp:
192	45.1k	case mmix_operands_pushgo:
193	45.6k	case mmix_operands_pop:
194	46.4k	case mmix_operands_sync:
195	48.6k	case mmix_operands_x_regs_z:
196	49.6k	case mmix_operands_neg:
197	50.6k	case mmix_operands_pushj:
198	57.7k	case mmix_operands_regaddr:
199	57.8k	case mmix_operands_get:
200	58.0k	case mmix_operands_set:
201	58.0k	case mmix_operands_save:
202	58.1k	case mmix_operands_unsave:
203	86.2k	case mmix_operands_xyz_opt:
204	86.2k	return opcodep;
205
206		/* For a ROUND_MODE, the middle byte must be 0..4. */
207	3.81k	case mmix_operands_roundregs_z:
208	5.40k	case mmix_operands_roundregs:
209	5.40k	{
210	5.40k	int midbyte = (insn >> 8) & 255;
211
212	5.40k	if (midbyte <= 4)
213	1.37k	return opcodep;
214	5.40k	}
215	4.03k	break;
216
217	4.03k	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	177	if ((insn & INSN_IMMEDIATE_BIT)
221	177	\|\| ((insn >> 16) & 255) < 32)
222	166	return opcodep;
223	11	break;
224
225	80	case mmix_operands_resume:
226		/* Middle bytes must be zero. */
227	80	if ((insn & 0x00ffff00) == 0)
228	80	return opcodep;
229	0	break;
230
231	0	default:
232	0	BAD_CASE (opcodep->operands);
233	91.8k	}
234
235	4.04k	opcodep++;
236	4.04k	}
237	91.8k	while ((opcodep->match & insn) == opcodep->match
238	4.04k	&& (opcodep->lose & insn) == 0);
239
240		/* If we got here, we had no match. */
241	4.04k	return NULL;
242	91.8k	}
243
244		static inline const char *
245		get_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
246	124k	{
247	124k	if (x >= MAX_REG_NAME_LEN)
248	0	return _("illegal");
249	124k	return minfop->reg_name[x];
250	124k	}
251
252		static inline const char *
253		get_spec_reg_name (const struct mmix_dis_info * minfop, unsigned int x)
254	285	{
255	285	if (x >= MAX_SPEC_REG_NAME_LEN)
256	24	return _("illegal");
257	261	return minfop->spec_reg_name[x];
258	285	}
259
260		/* The main disassembly function. */
261
262		int
263		print_insn_mmix (bfd_vma memaddr, struct disassemble_info *info)
264	94.0k	{
265	94.0k	unsigned char buffer[4];
266	94.0k	unsigned long insn;
267	94.0k	unsigned int x, y, z;
268	94.0k	const struct mmix_opcode *opcodep;
269	94.0k	int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
270	94.0k	struct mmix_dis_info *minfop;
271
272	94.0k	if (status != 0)
273	202	{
274	202	(*info->memory_error_func) (status, memaddr, info);
275	202	return -1;
276	202	}
277
278		/* FIXME: Is -1 suitable? */
279	93.8k	if (info->private_data == NULL
280	93.8k	&& ! initialize_mmix_dis_info (info))
281	0	return -1;
282
283	93.8k	minfop = (struct mmix_dis_info *) info->private_data;
284	93.8k	x = buffer[1];
285	93.8k	y = buffer[2];
286	93.8k	z = buffer[3];
287
288	93.8k	insn = bfd_getb32 (buffer);
289
290	93.8k	opcodep = get_opcode (insn);
291
292	93.8k	if (opcodep == NULL)
293	6.03k	{
294	6.03k	(info->fprintf_func) (info->stream, _("unknown*"));
295	6.03k	return 4;
296	6.03k	}
297
298	87.8k	(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
299
300		/* Present bytes in the order they are laid out in memory. */
301	87.8k	info->display_endian = BFD_ENDIAN_BIG;
302
303	87.8k	info->insn_info_valid = 1;
304	87.8k	info->bytes_per_chunk = 4;
305	87.8k	info->branch_delay_insns = 0;
306	87.8k	info->target = 0;
307	87.8k	switch (opcodep->type)
308	87.8k	{
309	38.4k	case mmix_type_normal:
310	40.2k	case mmix_type_memaccess_block:
311	40.2k	info->insn_type = dis_nonbranch;
312	40.2k	break;
313
314	2.25k	case mmix_type_branch:
315	2.25k	info->insn_type = dis_branch;
316	2.25k	break;
317
318	6.93k	case mmix_type_condbranch:
319	6.93k	info->insn_type = dis_condbranch;
320	6.93k	break;
321
322	2.51k	case mmix_type_memaccess_octa:
323	2.51k	info->insn_type = dis_dref;
324	2.51k	info->data_size = 8;
325	2.51k	break;
326
327	2.12k	case mmix_type_memaccess_tetra:
328	2.12k	info->insn_type = dis_dref;
329	2.12k	info->data_size = 4;
330	2.12k	break;
331
332	1.50k	case mmix_type_memaccess_wyde:
333	1.50k	info->insn_type = dis_dref;
334	1.50k	info->data_size = 2;
335	1.50k	break;
336
337	2.70k	case mmix_type_memaccess_byte:
338	2.70k	info->insn_type = dis_dref;
339	2.70k	info->data_size = 1;
340	2.70k	break;
341
342	29.6k	case mmix_type_jsr:
343	29.6k	info->insn_type = dis_jsr;
344	29.6k	break;
345
346	0	default:
347	0	BAD_CASE(opcodep->type);
348	87.8k	}
349
350	87.8k	switch (opcodep->operands)
351	87.8k	{
352	6.39k	case mmix_operands_regs:
353		/* All registers: "$X,$Y,$Z". */
354	6.39k	(*info->fprintf_func) (info->stream, "%s,%s,%s",
355	6.39k	get_reg_name (minfop, x),
356	6.39k	get_reg_name (minfop, y),
357	6.39k	get_reg_name (minfop, z));
358	6.39k	break;
359
360	3.21k	case mmix_operands_reg_yz:
361		/* Like SETH - "$X,YZ". */
362	3.21k	(*info->fprintf_func) (info->stream, "%s,0x%x",
363	3.21k	get_reg_name (minfop, x), y * 256 + z);
364	3.21k	break;
365
366	9.17k	case mmix_operands_regs_z_opt:
367	33.1k	case mmix_operands_regs_z:
368	34.1k	case mmix_operands_pushgo:
369		/* The regular "$X,$Y,$Z\|Z". */
370	34.1k	if (insn & INSN_IMMEDIATE_BIT)
371	15.8k	(*info->fprintf_func) (info->stream, "%s,%s,%d",
372	15.8k	get_reg_name (minfop, x),
373	15.8k	get_reg_name (minfop, y), z);
374	18.2k	else
375	18.2k	(*info->fprintf_func) (info->stream, "%s,%s,%s",
376	18.2k	get_reg_name (minfop, x),
377	18.2k	get_reg_name (minfop, y),
378	18.2k	get_reg_name (minfop, z));
379	34.1k	break;
380
381	1.41k	case mmix_operands_jmp:
382		/* Address; only JMP. */
383	1.41k	{
384	1.41k	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
385
386	1.41k	if (insn & INSN_BACKWARD_OFFSET_BIT)
387	481	offset -= (256 * 65536) * 4;
388
389	1.41k	info->target = memaddr + offset;
390	1.41k	(*info->print_address_func) (memaddr + offset, info);
391	1.41k	}
392	1.41k	break;
393
394	907	case mmix_operands_roundregs_z:
395		/* Two registers, like FLOT, possibly with rounding: "$X,$Z\|Z"
396		"$X,ROUND_MODE,$Z\|Z". */
397	907	if (y != 0)
398	314	{
399	314	if (insn & INSN_IMMEDIATE_BIT)
400	130	(*info->fprintf_func) (info->stream, "%s,%s,%d",
401	130	get_reg_name (minfop, x),
402	130	ROUND_MODE (y), z);
403	184	else
404	184	(*info->fprintf_func) (info->stream, "%s,%s,%s",
405	184	get_reg_name (minfop, x),
406	184	ROUND_MODE (y),
407	184	get_reg_name (minfop, z));
408	314	}
409	593	else
410	593	{
411	593	if (insn & INSN_IMMEDIATE_BIT)
412	350	(*info->fprintf_func) (info->stream, "%s,%d",
413	350	get_reg_name (minfop, x), z);
414	243	else
415	243	(*info->fprintf_func) (info->stream, "%s,%s",
416	243	get_reg_name (minfop, x),
417	243	get_reg_name (minfop, z));
418	593	}
419	907	break;
420
421	524	case mmix_operands_pop:
422		/* Like POP - "X,YZ". */
423	524	(info->fprintf_func) (info->stream, "%d,%d", x, y256 + z);
424	524	break;
425
426	466	case mmix_operands_roundregs:
427		/* Two registers, possibly with rounding: "$X,$Z" or
428		"$X,ROUND_MODE,$Z". */
429	466	if (y != 0)
430	230	(*info->fprintf_func) (info->stream, "%s,%s,%s",
431	230	get_reg_name (minfop, x),
432	230	ROUND_MODE (y),
433	230	get_reg_name (minfop, z));
434	236	else
435	236	(*info->fprintf_func) (info->stream, "%s,%s",
436	236	get_reg_name (minfop, x),
437	236	get_reg_name (minfop, z));
438	466	break;
439
440	781	case mmix_operands_sync:
441		/* Like SYNC - "XYZ". */
442	781	(*info->fprintf_func) (info->stream, "%u",
443	781	x * 65536 + y * 256 + z);
444	781	break;
445
446	2.20k	case mmix_operands_x_regs_z:
447		/* Like SYNCD - "X,$Y,$Z\|Z". */
448	2.20k	if (insn & INSN_IMMEDIATE_BIT)
449	924	(*info->fprintf_func) (info->stream, "%d,%s,%d",
450	924	x, get_reg_name (minfop, y), z);
451	1.27k	else
452	1.27k	(*info->fprintf_func) (info->stream, "%d,%s,%s",
453	1.27k	x, get_reg_name (minfop, y),
454	1.27k	get_reg_name (minfop, z));
455	2.20k	break;
456
457	999	case mmix_operands_neg:
458		/* Like NEG and NEGU - "$X,Y,$Z\|Z". */
459	999	if (insn & INSN_IMMEDIATE_BIT)
460	424	(*info->fprintf_func) (info->stream, "%s,%d,%d",
461	424	get_reg_name (minfop, x), y, z);
462	575	else
463	575	(*info->fprintf_func) (info->stream, "%s,%d,%s",
464	575	get_reg_name (minfop, x), y,
465	575	get_reg_name (minfop, z));
466	999	break;
467
468	1.00k	case mmix_operands_pushj:
469	8.12k	case mmix_operands_regaddr:
470		/* Like GETA or branches - "$X,Address". */
471	8.12k	{
472	8.12k	bfd_signed_vma offset = (y * 256 + z) * 4;
473
474	8.12k	if (insn & INSN_BACKWARD_OFFSET_BIT)
475	4.28k	offset -= 65536 * 4;
476
477	8.12k	info->target = memaddr + offset;
478
479	8.12k	(*info->fprintf_func) (info->stream, "%s,", get_reg_name (minfop, x));
480	8.12k	(*info->print_address_func) (memaddr + offset, info);
481	8.12k	}
482	8.12k	break;
483
484	119	case mmix_operands_get:
485		/* GET - "X,spec_reg". */
486	119	(*info->fprintf_func) (info->stream, "%s,%s",
487	119	get_reg_name (minfop, x),
488	119	get_spec_reg_name (minfop, z));
489	119	break;
490
491	166	case mmix_operands_put:
492		/* PUT - "spec_reg,$Z\|Z". */
493	166	if (insn & INSN_IMMEDIATE_BIT)
494	69	(*info->fprintf_func) (info->stream, "%s,%d",
495	69	get_spec_reg_name (minfop, x), z);
496	97	else
497	97	(*info->fprintf_func) (info->stream, "%s,%s",
498	97	get_spec_reg_name (minfop, x),
499	97	get_reg_name (minfop, z));
500	166	break;
501
502	130	case mmix_operands_set:
503		/* Two registers, "$X,$Y". */
504	130	(*info->fprintf_func) (info->stream, "%s,%s",
505	130	get_reg_name (minfop, x),
506	130	get_reg_name (minfop, y));
507	130	break;
508
509	68	case mmix_operands_save:
510		/* SAVE - "$X,0". */
511	68	(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
512	68	break;
513
514	46	case mmix_operands_unsave:
515		/* UNSAVE - "0,$Z". */
516	46	(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
517	46	break;
518
519	28.0k	case mmix_operands_xyz_opt:
520		/* Like SWYM or TRAP - "X,Y,Z". */
521	28.0k	(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
522	28.0k	break;
523
524	80	case mmix_operands_resume:
525		/* Just "Z", like RESUME. */
526	80	(*info->fprintf_func) (info->stream, "%d", z);
527	80	break;
528
529	0	default:
530	0	(info->fprintf_func) (info->stream, _("unknown operands type: %d*"),
531	0	opcodep->operands);
532	0	break;
533	87.8k	}
534
535	87.8k	return 4;
536	87.8k	}