526 lines
14 KiB
C
526 lines
14 KiB
C
/* mmix-dis.c -- Disassemble MMIX instructions.
|
|
Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
|
|
Written by Hans-Peter Nilsson (hp@bitrange.com)
|
|
|
|
This file is part of GDB and the GNU binutils.
|
|
|
|
GDB and the GNU binutils are free software; you can redistribute
|
|
them and/or modify them under the terms of the GNU General Public
|
|
License as published by the Free Software Foundation; either version 2,
|
|
or (at your option) any later version.
|
|
|
|
GDB and the GNU binutils are distributed in the hope that they
|
|
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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include "opcode/mmix.h"
|
|
#include "dis-asm.h"
|
|
#include "libiberty.h"
|
|
#include "bfd.h"
|
|
#include "opintl.h"
|
|
|
|
#define BAD_CASE(x) \
|
|
do \
|
|
{ \
|
|
fprintf (stderr, \
|
|
_("Bad case %d (%s) in %s:%d\n"), \
|
|
x, #x, __FILE__, __LINE__); \
|
|
abort (); \
|
|
} \
|
|
while (0)
|
|
|
|
#define FATAL_DEBUG \
|
|
do \
|
|
{ \
|
|
fprintf (stderr, \
|
|
_("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)
|
|
|
|
struct mmix_dis_info
|
|
{
|
|
const char *reg_name[256];
|
|
const char *spec_reg_name[32];
|
|
|
|
/* 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[256][sizeof ("$255")];
|
|
};
|
|
|
|
static bfd_boolean initialize_mmix_dis_info
|
|
PARAMS ((struct disassemble_info *));
|
|
static const struct mmix_opcode *get_opcode
|
|
PARAMS ((unsigned long));
|
|
|
|
|
|
/* Initialize a target-specific array in INFO. */
|
|
|
|
static bfd_boolean
|
|
initialize_mmix_dis_info (info)
|
|
struct disassemble_info *info;
|
|
{
|
|
struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
|
|
int i;
|
|
|
|
if (minfop == NULL)
|
|
return FALSE;
|
|
|
|
memset (minfop, 0, sizeof (*minfop));
|
|
|
|
/* Initialize register names from register symbols. If there's no
|
|
register section, then there are no register symbols. */
|
|
if ((info->section != NULL && info->section->owner != NULL)
|
|
|| (info->symbols != NULL
|
|
&& info->symbols[0] != NULL
|
|
&& bfd_asymbol_bfd (info->symbols[0]) != NULL))
|
|
{
|
|
bfd *abfd = info->section && info->section->owner != NULL
|
|
? info->section->owner
|
|
: bfd_asymbol_bfd (info->symbols[0]);
|
|
asection *reg_section = bfd_get_section_by_name (abfd, "*REG*");
|
|
|
|
if (reg_section != NULL)
|
|
{
|
|
/* The returned symcount *does* include the ending NULL. */
|
|
long symsize = bfd_get_symtab_upper_bound (abfd);
|
|
asymbol **syms = malloc (symsize);
|
|
long nsyms;
|
|
long i;
|
|
|
|
if (syms == NULL)
|
|
{ FATAL_DEBUG;
|
|
free (minfop);
|
|
return FALSE;
|
|
}
|
|
nsyms = bfd_canonicalize_symtab (abfd, syms);
|
|
|
|
/* We use the first name for a register. If this is MMO, then
|
|
it's the name with the first sequence number, presumably the
|
|
first in the source. */
|
|
for (i = 0; i < nsyms && syms[i] != NULL; i++)
|
|
{
|
|
if (syms[i]->section == reg_section
|
|
&& syms[i]->value < 256
|
|
&& minfop->reg_name[syms[i]->value] == NULL)
|
|
minfop->reg_name[syms[i]->value] = syms[i]->name;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Fill in the rest with the canonical names. */
|
|
for (i = 0; i < 256; i++)
|
|
if (minfop->reg_name[i] == NULL)
|
|
{
|
|
sprintf (minfop->basic_reg_name[i], "$%d", 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 = (PTR) 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 (insn)
|
|
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;
|
|
}
|
|
|
|
/* The main disassembly function. */
|
|
|
|
int
|
|
print_insn_mmix (memaddr, info)
|
|
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,$Z". */
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
|
minfop->reg_name[x],
|
|
minfop->reg_name[y],
|
|
minfop->reg_name[z]);
|
|
break;
|
|
|
|
case mmix_operands_reg_yz:
|
|
/* Like SETH - "$X,YZ". */
|
|
(*info->fprintf_func) (info->stream, "%s,0x%x",
|
|
minfop->reg_name[x], y * 256 + z);
|
|
break;
|
|
|
|
case mmix_operands_regs_z_opt:
|
|
case mmix_operands_regs_z:
|
|
case mmix_operands_pushgo:
|
|
/* The regular "$X,$Y,$Z|Z". */
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%d",
|
|
minfop->reg_name[x], minfop->reg_name[y], z);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
|
minfop->reg_name[x],
|
|
minfop->reg_name[y],
|
|
minfop->reg_name[z]);
|
|
break;
|
|
|
|
case mmix_operands_jmp:
|
|
/* Address; only JMP. */
|
|
{
|
|
bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
|
|
|
|
if (insn & INSN_BACKWARD_OFFSET_BIT)
|
|
offset -= (256 * 65536) * 4;
|
|
|
|
info->target = memaddr + offset;
|
|
(*info->print_address_func) (memaddr + offset, info);
|
|
}
|
|
break;
|
|
|
|
case mmix_operands_roundregs_z:
|
|
/* Two registers, like FLOT, possibly with rounding: "$X,$Z|Z"
|
|
"$X,ROUND_MODE,$Z|Z". */
|
|
if (y != 0)
|
|
{
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%d",
|
|
minfop->reg_name[x],
|
|
ROUND_MODE (y), z);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
|
minfop->reg_name[x],
|
|
ROUND_MODE (y),
|
|
minfop->reg_name[z]);
|
|
}
|
|
else
|
|
{
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
|
(*info->fprintf_func) (info->stream, "%s,%d",
|
|
minfop->reg_name[x], z);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
|
minfop->reg_name[x],
|
|
minfop->reg_name[z]);
|
|
}
|
|
break;
|
|
|
|
case mmix_operands_pop:
|
|
/* Like POP - "X,YZ". */
|
|
(*info->fprintf_func) (info->stream, "%d,%d", x, y*256 + z);
|
|
break;
|
|
|
|
case mmix_operands_roundregs:
|
|
/* Two registers, possibly with rounding: "$X,$Z" or
|
|
"$X,ROUND_MODE,$Z". */
|
|
if (y != 0)
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
|
minfop->reg_name[x],
|
|
ROUND_MODE (y),
|
|
minfop->reg_name[z]);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
|
minfop->reg_name[x],
|
|
minfop->reg_name[z]);
|
|
break;
|
|
|
|
case mmix_operands_sync:
|
|
/* Like SYNC - "XYZ". */
|
|
(*info->fprintf_func) (info->stream, "%u",
|
|
x * 65536 + y * 256 + z);
|
|
break;
|
|
|
|
case mmix_operands_x_regs_z:
|
|
/* Like SYNCD - "X,$Y,$Z|Z". */
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
|
(*info->fprintf_func) (info->stream, "%d,%s,%d",
|
|
x, minfop->reg_name[y], z);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%d,%s,%s",
|
|
x, minfop->reg_name[y],
|
|
minfop->reg_name[z]);
|
|
break;
|
|
|
|
case mmix_operands_neg:
|
|
/* Like NEG and NEGU - "$X,Y,$Z|Z". */
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
|
(*info->fprintf_func) (info->stream, "%s,%d,%d",
|
|
minfop->reg_name[x], y, z);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%s,%d,%s",
|
|
minfop->reg_name[x], y,
|
|
minfop->reg_name[z]);
|
|
break;
|
|
|
|
case mmix_operands_pushj:
|
|
case mmix_operands_regaddr:
|
|
/* Like GETA or branches - "$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,", minfop->reg_name[x]);
|
|
(*info->print_address_func) (memaddr + offset, info);
|
|
}
|
|
break;
|
|
|
|
case mmix_operands_get:
|
|
/* GET - "X,spec_reg". */
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
|
minfop->reg_name[x],
|
|
minfop->spec_reg_name[z]);
|
|
break;
|
|
|
|
case mmix_operands_put:
|
|
/* PUT - "spec_reg,$Z|Z". */
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
|
(*info->fprintf_func) (info->stream, "%s,%d",
|
|
minfop->spec_reg_name[x], z);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
|
minfop->spec_reg_name[x],
|
|
minfop->reg_name[z]);
|
|
break;
|
|
|
|
case mmix_operands_set:
|
|
/* Two registers, "$X,$Y". */
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
|
minfop->reg_name[x],
|
|
minfop->reg_name[y]);
|
|
break;
|
|
|
|
case mmix_operands_save:
|
|
/* SAVE - "$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;
|
|
}
|