524 lines
14 KiB
C
524 lines
14 KiB
C
/* 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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/* 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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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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default:
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BAD_CASE (opcodep->operands);
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}
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opcodep++;
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}
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while ((opcodep->match & insn) == opcodep->match
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&& (opcodep->lose & insn) == 0);
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/* If we got here, we had no match. */
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return NULL;
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}
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/* The main disassembly function. */
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int
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print_insn_mmix (memaddr, info)
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bfd_vma memaddr;
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struct disassemble_info *info;
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{
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unsigned char buffer[4];
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unsigned long insn;
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unsigned int x, y, z;
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const struct mmix_opcode *opcodep;
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int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
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struct mmix_dis_info *minfop;
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if (status != 0)
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{
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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/* FIXME: Is -1 suitable? */
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if (info->private_data == NULL
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&& ! initialize_mmix_dis_info (info))
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return -1;
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minfop = (struct mmix_dis_info *) info->private_data;
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x = buffer[1];
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y = buffer[2];
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z = buffer[3];
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insn = bfd_getb32 (buffer);
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opcodep = get_opcode (insn);
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if (opcodep == NULL)
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{
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(*info->fprintf_func) (info->stream, _("*unknown*"));
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return 4;
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}
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(*info->fprintf_func) (info->stream, "%s ", opcodep->name);
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/* Present bytes in the order they are laid out in memory. */
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info->display_endian = BFD_ENDIAN_BIG;
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info->insn_info_valid = 1;
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info->bytes_per_chunk = 4;
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info->branch_delay_insns = 0;
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info->target = 0;
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switch (opcodep->type)
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{
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case mmix_type_normal:
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case mmix_type_memaccess_block:
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info->insn_type = dis_nonbranch;
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break;
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case mmix_type_branch:
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info->insn_type = dis_branch;
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break;
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case mmix_type_condbranch:
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info->insn_type = dis_condbranch;
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break;
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case mmix_type_memaccess_octa:
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info->insn_type = dis_dref;
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info->data_size = 8;
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break;
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case mmix_type_memaccess_tetra:
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info->insn_type = dis_dref;
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info->data_size = 4;
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break;
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case mmix_type_memaccess_wyde:
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info->insn_type = dis_dref;
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info->data_size = 2;
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break;
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case mmix_type_memaccess_byte:
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info->insn_type = dis_dref;
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info->data_size = 1;
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break;
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case mmix_type_jsr:
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info->insn_type = dis_jsr;
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break;
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default:
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BAD_CASE(opcodep->type);
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}
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switch (opcodep->operands)
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{
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case mmix_operands_regs:
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/* All registers: "$X,$Y,$Z". */
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(*info->fprintf_func) (info->stream, "%s,%s,%s",
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minfop->reg_name[x],
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minfop->reg_name[y],
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minfop->reg_name[z]);
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break;
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case mmix_operands_reg_yz:
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/* Like SETH - "$X,YZ". */
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(*info->fprintf_func) (info->stream, "%s,0x%x",
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minfop->reg_name[x], y * 256 + z);
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break;
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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_pushgo:
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/* The regular "$X,$Y,$Z|Z". */
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if (insn & INSN_IMMEDIATE_BIT)
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(*info->fprintf_func) (info->stream, "%s,%s,%d",
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minfop->reg_name[x], minfop->reg_name[y], z);
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else
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(*info->fprintf_func) (info->stream, "%s,%s,%s",
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minfop->reg_name[x],
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minfop->reg_name[y],
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minfop->reg_name[z]);
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break;
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case mmix_operands_jmp:
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/* Address; only JMP. */
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{
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bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
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if (insn & INSN_BACKWARD_OFFSET_BIT)
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offset -= (256 * 65536) * 4;
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info->target = memaddr + offset;
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(*info->print_address_func) (memaddr + offset, info);
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}
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break;
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case mmix_operands_roundregs_z:
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/* Two registers, like FLOT, possibly with rounding: "$X,$Z|Z"
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"$X,ROUND_MODE,$Z|Z". */
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if (y != 0)
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{
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if (insn & INSN_IMMEDIATE_BIT)
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(*info->fprintf_func) (info->stream, "%s,%s,%d",
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minfop->reg_name[x],
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ROUND_MODE (y), z);
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else
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(*info->fprintf_func) (info->stream, "%s,%s,%s",
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minfop->reg_name[x],
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ROUND_MODE (y),
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minfop->reg_name[z]);
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}
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else
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{
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if (insn & INSN_IMMEDIATE_BIT)
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(*info->fprintf_func) (info->stream, "%s,%d",
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minfop->reg_name[x], z);
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else
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(*info->fprintf_func) (info->stream, "%s,%s",
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minfop->reg_name[x],
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minfop->reg_name[z]);
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}
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break;
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case mmix_operands_pop:
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/* Like POP - "X,YZ". */
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(*info->fprintf_func) (info->stream, "%d,%d", x, y*256 + z);
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break;
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case mmix_operands_roundregs:
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/* Two registers, possibly with rounding: "$X,$Z" or
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"$X,ROUND_MODE,$Z". */
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if (y != 0)
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(*info->fprintf_func) (info->stream, "%s,%s,%s",
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minfop->reg_name[x],
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ROUND_MODE (y),
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minfop->reg_name[z]);
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else
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(*info->fprintf_func) (info->stream, "%s,%s",
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minfop->reg_name[x],
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minfop->reg_name[z]);
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break;
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case mmix_operands_sync:
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/* Like SYNC - "XYZ". */
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(*info->fprintf_func) (info->stream, "%u",
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x * 65536 + y * 256 + z);
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break;
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case mmix_operands_x_regs_z:
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/* Like SYNCD - "X,$Y,$Z|Z". */
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if (insn & INSN_IMMEDIATE_BIT)
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(*info->fprintf_func) (info->stream, "%d,%s,%d",
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x, minfop->reg_name[y], z);
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else
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(*info->fprintf_func) (info->stream, "%d,%s,%s",
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x, minfop->reg_name[y],
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minfop->reg_name[z]);
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break;
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case mmix_operands_neg:
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/* Like NEG and NEGU - "$X,Y,$Z|Z". */
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if (insn & INSN_IMMEDIATE_BIT)
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(*info->fprintf_func) (info->stream, "%s,%d,%d",
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minfop->reg_name[x], y, z);
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else
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(*info->fprintf_func) (info->stream, "%s,%d,%s",
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minfop->reg_name[x], y,
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minfop->reg_name[z]);
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break;
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case mmix_operands_pushj:
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case mmix_operands_regaddr:
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/* Like GETA or branches - "$X,Address". */
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{
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bfd_signed_vma offset = (y * 256 + z) * 4;
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if (insn & INSN_BACKWARD_OFFSET_BIT)
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offset -= 65536 * 4;
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info->target = memaddr + offset;
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(*info->fprintf_func) (info->stream, "%s,", minfop->reg_name[x]);
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(*info->print_address_func) (memaddr + offset, info);
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}
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break;
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case mmix_operands_get:
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/* GET - "X,spec_reg". */
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(*info->fprintf_func) (info->stream, "%s,%s",
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minfop->reg_name[x],
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minfop->spec_reg_name[z]);
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break;
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case mmix_operands_put:
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/* PUT - "spec_reg,$Z|Z". */
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if (insn & INSN_IMMEDIATE_BIT)
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(*info->fprintf_func) (info->stream, "%s,%d",
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minfop->spec_reg_name[x], z);
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else
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(*info->fprintf_func) (info->stream, "%s,%s",
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minfop->spec_reg_name[x],
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minfop->reg_name[z]);
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break;
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case mmix_operands_set:
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/* Two registers, "$X,$Y". */
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(*info->fprintf_func) (info->stream, "%s,%s",
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minfop->reg_name[x],
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minfop->reg_name[y]);
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break;
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case mmix_operands_save:
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/* SAVE - "$X,0". */
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(*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
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break;
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case mmix_operands_unsave:
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/* UNSAVE - "0,$Z". */
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(*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;
|
|
}
|