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1181 |
sfurman |
/* mmix-dis.c -- Disassemble MMIX instructions.
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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Written by Hans-Peter Nilsson (hp@bitrange.com)
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This file is part of GDB and the GNU binutils.
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GDB and the GNU binutils are free software; you can redistribute
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them and/or modify them under the terms of the GNU General Public
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License as published by the Free Software Foundation; either version 2,
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or (at your option) any later version.
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GDB and the GNU binutils are distributed in the hope that they
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will be useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this file; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "opcode/mmix.h"
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#include "dis-asm.h"
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#include "libiberty.h"
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#include "bfd.h"
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#include "opintl.h"
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#define BAD_CASE(x) \
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do \
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{ \
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fprintf (stderr, \
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_("Bad case %d (%s) in %s:%d\n"), \
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x, #x, __FILE__, __LINE__); \
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abort (); \
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} \
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while (0)
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#define FATAL_DEBUG \
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do \
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{ \
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fprintf (stderr, \
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_("Internal: Non-debugged code (test-case missing): %s:%d"), \
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__FILE__, __LINE__); \
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abort (); \
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} \
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while (0)
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#define ROUND_MODE(n) \
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((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" : \
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(n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" : \
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_("(unknown)"))
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#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
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#define INSN_BACKWARD_OFFSET_BIT (1 << 24)
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struct mmix_dis_info
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{
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const char *reg_name[256];
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const char *spec_reg_name[32];
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/* Waste a little memory so we don't have to allocate each separately.
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We could have an array with static contents for these, but on the
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other hand, we don't have to. */
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char basic_reg_name[256][sizeof ("$255")];
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};
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static boolean initialize_mmix_dis_info PARAMS ((struct disassemble_info *));
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static const struct mmix_opcode *get_opcode PARAMS ((unsigned long));
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/* Initialize a target-specific array in INFO. */
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static boolean
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initialize_mmix_dis_info (info)
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struct disassemble_info *info;
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{
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struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
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int i;
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if (minfop == NULL)
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return false;
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memset (minfop, 0, sizeof (*minfop));
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/* Initialize register names from register symbols. If there's no
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register section, then there are no register symbols. */
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if ((info->section != NULL && info->section->owner != NULL)
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|| (info->symbols != NULL
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&& info->symbols[0] != NULL
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&& bfd_asymbol_bfd (info->symbols[0]) != NULL))
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{
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bfd *abfd = info->section && info->section->owner != NULL
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? info->section->owner
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: bfd_asymbol_bfd (info->symbols[0]);
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asection *reg_section = bfd_get_section_by_name (abfd, "*REG*");
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if (reg_section != NULL)
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{
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/* The returned symcount *does* include the ending NULL. */
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long symsize = bfd_get_symtab_upper_bound (abfd);
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asymbol **syms = malloc (symsize);
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long nsyms;
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long i;
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if (syms == NULL)
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{ FATAL_DEBUG;
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free (minfop);
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return false;
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}
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nsyms = bfd_canonicalize_symtab (abfd, syms);
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/* We use the first name for a register. If this is MMO, then
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it's the name with the first sequence number, presumably the
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first in the source. */
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for (i = 0; i < nsyms && syms[i] != NULL; i++)
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{
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if (syms[i]->section == reg_section
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&& syms[i]->value < 256
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&& minfop->reg_name[syms[i]->value] == NULL)
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minfop->reg_name[syms[i]->value] = syms[i]->name;
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}
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}
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}
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/* Fill in the rest with the canonical names. */
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for (i = 0; i < 256; i++)
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if (minfop->reg_name[i] == NULL)
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{
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sprintf (minfop->basic_reg_name[i], "$%d", i);
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minfop->reg_name[i] = minfop->basic_reg_name[i];
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}
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/* We assume it's actually a one-to-one mapping of number-to-name. */
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for (i = 0; mmix_spec_regs[i].name != NULL; i++)
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minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;
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info->private_data = (PTR) minfop;
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return true;
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}
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/* A table indexed by the first byte is constructed as we disassemble each
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tetrabyte. The contents is a pointer into mmix_insns reflecting the
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first found entry with matching match-bits and lose-bits. Further
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entries are considered one after one until the operand constraints
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match or the match-bits and lose-bits do not match. Normally a
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"further entry" will just show that there was no other match. */
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static const struct mmix_opcode *
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get_opcode (insn)
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unsigned long insn;
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{
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static const struct mmix_opcode **opcodes = NULL;
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const struct mmix_opcode *opcodep = mmix_opcodes;
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unsigned int opcode_part = (insn >> 24) & 255;
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if (opcodes == NULL)
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opcodes = xcalloc (256, sizeof (struct mmix_opcode *));
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opcodep = opcodes[opcode_part];
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if (opcodep == NULL
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|| (opcodep->match & insn) != opcodep->match
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|| (opcodep->lose & insn) != 0)
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{
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/* Search through the table. */
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for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
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{
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/* FIXME: Break out this into an initialization function. */
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if ((opcodep->match & (opcode_part << 24)) == opcode_part
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&& (opcodep->lose & (opcode_part << 24)) == 0)
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opcodes[opcode_part] = opcodep;
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if ((opcodep->match & insn) == opcodep->match
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&& (opcodep->lose & insn) == 0)
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break;
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}
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}
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if (opcodep->name == NULL)
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return NULL;
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/* Check constraints. If they don't match, loop through the next opcode
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entries. */
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do
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{
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switch (opcodep->operands)
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{
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/* These have no restraint on what can be in the lower three
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bytes. */
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case mmix_operands_regs:
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case mmix_operands_reg_yz:
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case mmix_operands_regs_z_opt:
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case mmix_operands_regs_z:
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case mmix_operands_jmp:
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case mmix_operands_pushgo:
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case mmix_operands_pop:
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case mmix_operands_sync:
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case mmix_operands_x_regs_z:
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case mmix_operands_neg:
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case mmix_operands_pushj:
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case mmix_operands_regaddr:
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case mmix_operands_get:
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case mmix_operands_set:
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case mmix_operands_save:
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case mmix_operands_unsave:
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case mmix_operands_xyz_opt:
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return opcodep;
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| 209 |
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/* For a ROUND_MODE, the middle byte must be 0..4. */
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case mmix_operands_roundregs_z:
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case mmix_operands_roundregs:
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{
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int midbyte = (insn >> 8) & 255;
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if (midbyte <= 4)
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return opcodep;
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}
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break;
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case mmix_operands_put:
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/* A "PUT". If it is "immediate", then no restrictions,
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otherwise we have to make sure the register number is < 32. */
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if ((insn & INSN_IMMEDIATE_BIT)
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|| ((insn >> 16) & 255) < 32)
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return opcodep;
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break;
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| 227 |
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case mmix_operands_resume:
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/* Middle bytes must be zero. */
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if ((insn & 0x00ffff00) == 0)
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return opcodep;
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break;
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| 233 |
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default:
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BAD_CASE (opcodep->operands);
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| 235 |
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}
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| 237 |
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opcodep++;
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| 238 |
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}
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| 239 |
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while ((opcodep->match & insn) == opcodep->match
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| 240 |
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&& (opcodep->lose & insn) == 0);
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| 241 |
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| 242 |
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/* If we got here, we had no match. */
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| 243 |
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return NULL;
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| 244 |
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}
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| 245 |
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| 246 |
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/* The main disassembly function. */
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| 247 |
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| 248 |
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int
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| 249 |
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print_insn_mmix (memaddr, info)
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| 250 |
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bfd_vma memaddr;
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| 251 |
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struct disassemble_info *info;
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| 252 |
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{
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| 253 |
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unsigned char buffer[4];
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| 254 |
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unsigned long insn;
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| 255 |
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unsigned int x, y, z;
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| 256 |
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const struct mmix_opcode *opcodep;
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| 257 |
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int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
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| 258 |
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struct mmix_dis_info *minfop;
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| 259 |
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| 260 |
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if (status != 0)
|
| 261 |
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{
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| 262 |
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(*info->memory_error_func) (status, memaddr, info);
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| 263 |
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return -1;
|
| 264 |
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}
|
| 265 |
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|
| 266 |
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/* FIXME: Is -1 suitable? */
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| 267 |
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if (info->private_data == NULL
|
| 268 |
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&& ! initialize_mmix_dis_info (info))
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| 269 |
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return -1;
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| 270 |
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| 271 |
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minfop = (struct mmix_dis_info *) info->private_data;
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| 272 |
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x = buffer[1];
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| 273 |
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y = buffer[2];
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| 274 |
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z = buffer[3];
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| 275 |
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| 276 |
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insn = bfd_getb32 (buffer);
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| 277 |
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| 278 |
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opcodep = get_opcode (insn);
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| 279 |
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|
| 280 |
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if (opcodep == NULL)
|
| 281 |
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{
|
| 282 |
|
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(*info->fprintf_func) (info->stream, _("*unknown*"));
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| 283 |
|
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return 4;
|
| 284 |
|
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}
|
| 285 |
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|
| 286 |
|
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(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
|
| 287 |
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|
| 288 |
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/* Present bytes in the order they are laid out in memory. */
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| 289 |
|
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info->display_endian = BFD_ENDIAN_BIG;
|
| 290 |
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|
| 291 |
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info->insn_info_valid = 1;
|
| 292 |
|
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info->bytes_per_chunk = 4;
|
| 293 |
|
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info->branch_delay_insns = 0;
|
| 294 |
|
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info->target = 0;
|
| 295 |
|
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switch (opcodep->type)
|
| 296 |
|
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{
|
| 297 |
|
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case mmix_type_normal:
|
| 298 |
|
|
case mmix_type_memaccess_block:
|
| 299 |
|
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info->insn_type = dis_nonbranch;
|
| 300 |
|
|
break;
|
| 301 |
|
|
|
| 302 |
|
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case mmix_type_branch:
|
| 303 |
|
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info->insn_type = dis_branch;
|
| 304 |
|
|
break;
|
| 305 |
|
|
|
| 306 |
|
|
case mmix_type_condbranch:
|
| 307 |
|
|
info->insn_type = dis_condbranch;
|
| 308 |
|
|
break;
|
| 309 |
|
|
|
| 310 |
|
|
case mmix_type_memaccess_octa:
|
| 311 |
|
|
info->insn_type = dis_dref;
|
| 312 |
|
|
info->data_size = 8;
|
| 313 |
|
|
break;
|
| 314 |
|
|
|
| 315 |
|
|
case mmix_type_memaccess_tetra:
|
| 316 |
|
|
info->insn_type = dis_dref;
|
| 317 |
|
|
info->data_size = 4;
|
| 318 |
|
|
break;
|
| 319 |
|
|
|
| 320 |
|
|
case mmix_type_memaccess_wyde:
|
| 321 |
|
|
info->insn_type = dis_dref;
|
| 322 |
|
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info->data_size = 2;
|
| 323 |
|
|
break;
|
| 324 |
|
|
|
| 325 |
|
|
case mmix_type_memaccess_byte:
|
| 326 |
|
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info->insn_type = dis_dref;
|
| 327 |
|
|
info->data_size = 1;
|
| 328 |
|
|
break;
|
| 329 |
|
|
|
| 330 |
|
|
case mmix_type_jsr:
|
| 331 |
|
|
info->insn_type = dis_jsr;
|
| 332 |
|
|
break;
|
| 333 |
|
|
|
| 334 |
|
|
default:
|
| 335 |
|
|
BAD_CASE(opcodep->type);
|
| 336 |
|
|
}
|
| 337 |
|
|
|
| 338 |
|
|
switch (opcodep->operands)
|
| 339 |
|
|
{
|
| 340 |
|
|
case mmix_operands_regs:
|
| 341 |
|
|
/* All registers: "$X,$Y,$Z". */
|
| 342 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
| 343 |
|
|
minfop->reg_name[x],
|
| 344 |
|
|
minfop->reg_name[y],
|
| 345 |
|
|
minfop->reg_name[z]);
|
| 346 |
|
|
break;
|
| 347 |
|
|
|
| 348 |
|
|
case mmix_operands_reg_yz:
|
| 349 |
|
|
/* Like SETH - "$X,YZ". */
|
| 350 |
|
|
(*info->fprintf_func) (info->stream, "%s,0x%x",
|
| 351 |
|
|
minfop->reg_name[x], y * 256 + z);
|
| 352 |
|
|
break;
|
| 353 |
|
|
|
| 354 |
|
|
case mmix_operands_regs_z_opt:
|
| 355 |
|
|
case mmix_operands_regs_z:
|
| 356 |
|
|
case mmix_operands_pushgo:
|
| 357 |
|
|
/* The regular "$X,$Y,$Z|Z". */
|
| 358 |
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
| 359 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%d",
|
| 360 |
|
|
minfop->reg_name[x], minfop->reg_name[y], z);
|
| 361 |
|
|
else
|
| 362 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
| 363 |
|
|
minfop->reg_name[x],
|
| 364 |
|
|
minfop->reg_name[y],
|
| 365 |
|
|
minfop->reg_name[z]);
|
| 366 |
|
|
break;
|
| 367 |
|
|
|
| 368 |
|
|
case mmix_operands_jmp:
|
| 369 |
|
|
/* Address; only JMP. */
|
| 370 |
|
|
{
|
| 371 |
|
|
bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
|
| 372 |
|
|
|
| 373 |
|
|
if (insn & INSN_BACKWARD_OFFSET_BIT)
|
| 374 |
|
|
offset -= (256 * 65536) * 4;
|
| 375 |
|
|
|
| 376 |
|
|
info->target = memaddr + offset;
|
| 377 |
|
|
(*info->print_address_func) (memaddr + offset, info);
|
| 378 |
|
|
}
|
| 379 |
|
|
break;
|
| 380 |
|
|
|
| 381 |
|
|
case mmix_operands_roundregs_z:
|
| 382 |
|
|
/* Two registers, like FLOT, possibly with rounding: "$X,$Z|Z"
|
| 383 |
|
|
"$X,ROUND_MODE,$Z|Z". */
|
| 384 |
|
|
if (y != 0)
|
| 385 |
|
|
{
|
| 386 |
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
| 387 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%d",
|
| 388 |
|
|
minfop->reg_name[x],
|
| 389 |
|
|
ROUND_MODE (y), z);
|
| 390 |
|
|
else
|
| 391 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
| 392 |
|
|
minfop->reg_name[x],
|
| 393 |
|
|
ROUND_MODE (y),
|
| 394 |
|
|
minfop->reg_name[z]);
|
| 395 |
|
|
}
|
| 396 |
|
|
else
|
| 397 |
|
|
{
|
| 398 |
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
| 399 |
|
|
(*info->fprintf_func) (info->stream, "%s,%d",
|
| 400 |
|
|
minfop->reg_name[x], z);
|
| 401 |
|
|
else
|
| 402 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
| 403 |
|
|
minfop->reg_name[x],
|
| 404 |
|
|
minfop->reg_name[z]);
|
| 405 |
|
|
}
|
| 406 |
|
|
break;
|
| 407 |
|
|
|
| 408 |
|
|
case mmix_operands_pop:
|
| 409 |
|
|
/* Like POP - "X,YZ". */
|
| 410 |
|
|
(*info->fprintf_func) (info->stream, "%d,%d", x, y*256 + z);
|
| 411 |
|
|
break;
|
| 412 |
|
|
|
| 413 |
|
|
case mmix_operands_roundregs:
|
| 414 |
|
|
/* Two registers, possibly with rounding: "$X,$Z" or
|
| 415 |
|
|
"$X,ROUND_MODE,$Z". */
|
| 416 |
|
|
if (y != 0)
|
| 417 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s,%s",
|
| 418 |
|
|
minfop->reg_name[x],
|
| 419 |
|
|
ROUND_MODE (y),
|
| 420 |
|
|
minfop->reg_name[z]);
|
| 421 |
|
|
else
|
| 422 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
| 423 |
|
|
minfop->reg_name[x],
|
| 424 |
|
|
minfop->reg_name[z]);
|
| 425 |
|
|
break;
|
| 426 |
|
|
|
| 427 |
|
|
case mmix_operands_sync:
|
| 428 |
|
|
/* Like SYNC - "XYZ". */
|
| 429 |
|
|
(*info->fprintf_func) (info->stream, "%u",
|
| 430 |
|
|
x * 65536 + y * 256 + z);
|
| 431 |
|
|
break;
|
| 432 |
|
|
|
| 433 |
|
|
case mmix_operands_x_regs_z:
|
| 434 |
|
|
/* Like SYNCD - "X,$Y,$Z|Z". */
|
| 435 |
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
| 436 |
|
|
(*info->fprintf_func) (info->stream, "%d,%s,%d",
|
| 437 |
|
|
x, minfop->reg_name[y], z);
|
| 438 |
|
|
else
|
| 439 |
|
|
(*info->fprintf_func) (info->stream, "%d,%s,%s",
|
| 440 |
|
|
x, minfop->reg_name[y],
|
| 441 |
|
|
minfop->reg_name[z]);
|
| 442 |
|
|
break;
|
| 443 |
|
|
|
| 444 |
|
|
case mmix_operands_neg:
|
| 445 |
|
|
/* Like NEG and NEGU - "$X,Y,$Z|Z". */
|
| 446 |
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
| 447 |
|
|
(*info->fprintf_func) (info->stream, "%s,%d,%d",
|
| 448 |
|
|
minfop->reg_name[x], y, z);
|
| 449 |
|
|
else
|
| 450 |
|
|
(*info->fprintf_func) (info->stream, "%s,%d,%s",
|
| 451 |
|
|
minfop->reg_name[x], y,
|
| 452 |
|
|
minfop->reg_name[z]);
|
| 453 |
|
|
break;
|
| 454 |
|
|
|
| 455 |
|
|
case mmix_operands_pushj:
|
| 456 |
|
|
case mmix_operands_regaddr:
|
| 457 |
|
|
/* Like GETA or branches - "$X,Address". */
|
| 458 |
|
|
{
|
| 459 |
|
|
bfd_signed_vma offset = (y * 256 + z) * 4;
|
| 460 |
|
|
|
| 461 |
|
|
if (insn & INSN_BACKWARD_OFFSET_BIT)
|
| 462 |
|
|
offset -= 65536 * 4;
|
| 463 |
|
|
|
| 464 |
|
|
info->target = memaddr + offset;
|
| 465 |
|
|
|
| 466 |
|
|
(*info->fprintf_func) (info->stream, "%s,", minfop->reg_name[x]);
|
| 467 |
|
|
(*info->print_address_func) (memaddr + offset, info);
|
| 468 |
|
|
}
|
| 469 |
|
|
break;
|
| 470 |
|
|
|
| 471 |
|
|
case mmix_operands_get:
|
| 472 |
|
|
/* GET - "X,spec_reg". */
|
| 473 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
| 474 |
|
|
minfop->reg_name[x],
|
| 475 |
|
|
minfop->spec_reg_name[z]);
|
| 476 |
|
|
break;
|
| 477 |
|
|
|
| 478 |
|
|
case mmix_operands_put:
|
| 479 |
|
|
/* PUT - "spec_reg,$Z|Z". */
|
| 480 |
|
|
if (insn & INSN_IMMEDIATE_BIT)
|
| 481 |
|
|
(*info->fprintf_func) (info->stream, "%s,%d",
|
| 482 |
|
|
minfop->spec_reg_name[x], z);
|
| 483 |
|
|
else
|
| 484 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
| 485 |
|
|
minfop->spec_reg_name[x],
|
| 486 |
|
|
minfop->reg_name[z]);
|
| 487 |
|
|
break;
|
| 488 |
|
|
|
| 489 |
|
|
case mmix_operands_set:
|
| 490 |
|
|
/* Two registers, "$X,$Y". */
|
| 491 |
|
|
(*info->fprintf_func) (info->stream, "%s,%s",
|
| 492 |
|
|
minfop->reg_name[x],
|
| 493 |
|
|
minfop->reg_name[y]);
|
| 494 |
|
|
break;
|
| 495 |
|
|
|
| 496 |
|
|
case mmix_operands_save:
|
| 497 |
|
|
/* SAVE - "$X,0". */
|
| 498 |
|
|
(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
|
| 499 |
|
|
break;
|
| 500 |
|
|
|
| 501 |
|
|
case mmix_operands_unsave:
|
| 502 |
|
|
/* UNSAVE - "0,$Z". */
|
| 503 |
|
|
(*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
|
| 504 |
|
|
break;
|
| 505 |
|
|
|
| 506 |
|
|
case mmix_operands_xyz_opt:
|
| 507 |
|
|
/* Like SWYM or TRAP - "X,Y,Z". */
|
| 508 |
|
|
(*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
|
| 509 |
|
|
break;
|
| 510 |
|
|
|
| 511 |
|
|
case mmix_operands_resume:
|
| 512 |
|
|
/* Just "Z", like RESUME. */
|
| 513 |
|
|
(*info->fprintf_func) (info->stream, "%d", z);
|
| 514 |
|
|
break;
|
| 515 |
|
|
|
| 516 |
|
|
default:
|
| 517 |
|
|
(*info->fprintf_func) (info->stream, _("*unknown operands type: %d*"),
|
| 518 |
|
|
opcodep->operands);
|
| 519 |
|
|
break;
|
| 520 |
|
|
}
|
| 521 |
|
|
|
| 522 |
|
|
return 4;
|
| 523 |
|
|
}
|
