mirror of
https://github.com/autc04/Retro68.git
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335 lines
8.5 KiB
C
335 lines
8.5 KiB
C
/* Disassemble MN10200 instructions.
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Copyright (C) 1996-2018 Free Software Foundation, Inc.
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This file is part of the GNU opcodes library.
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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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 program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include <stdio.h>
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#include "opcode/mn10200.h"
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#include "disassemble.h"
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#include "opintl.h"
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static void
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disassemble (bfd_vma memaddr,
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struct disassemble_info *info,
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unsigned long insn,
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unsigned long extension,
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unsigned int size)
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{
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struct mn10200_opcode *op = (struct mn10200_opcode *)mn10200_opcodes;
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const struct mn10200_operand *operand;
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int match = 0;
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/* Find the opcode. */
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while (op->name)
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{
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int mysize, extra_shift;
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if (op->format == FMT_1)
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mysize = 1;
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else if (op->format == FMT_2
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|| op->format == FMT_4)
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mysize = 2;
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else if (op->format == FMT_3
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|| op->format == FMT_5)
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mysize = 3;
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else if (op->format == FMT_6)
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mysize = 4;
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else if (op->format == FMT_7)
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mysize = 5;
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else
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abort ();
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if (op->format == FMT_2 || op->format == FMT_5)
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extra_shift = 8;
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else if (op->format == FMT_3
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|| op->format == FMT_6
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|| op->format == FMT_7)
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extra_shift = 16;
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else
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extra_shift = 0;
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if ((op->mask & insn) == op->opcode
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&& size == (unsigned int) mysize)
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{
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const unsigned char *opindex_ptr;
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unsigned int nocomma;
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int paren = 0;
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match = 1;
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(*info->fprintf_func) (info->stream, "%s\t", op->name);
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/* Now print the operands. */
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for (opindex_ptr = op->operands, nocomma = 1;
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*opindex_ptr != 0;
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opindex_ptr++)
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{
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unsigned long value;
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operand = &mn10200_operands[*opindex_ptr];
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if ((operand->flags & MN10200_OPERAND_EXTENDED) != 0)
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{
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value = (insn & 0xffff) << 8;
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value |= extension;
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}
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else
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{
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value = ((insn >> (operand->shift))
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& ((1L << operand->bits) - 1L));
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}
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if ((operand->flags & MN10200_OPERAND_SIGNED) != 0)
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value = ((long)(value << (32 - operand->bits))
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>> (32 - operand->bits));
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if (!nocomma
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&& (!paren
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|| ((operand->flags & MN10200_OPERAND_PAREN) == 0)))
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(*info->fprintf_func) (info->stream, ",");
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nocomma = 0;
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if ((operand->flags & MN10200_OPERAND_DREG) != 0)
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{
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value = ((insn >> (operand->shift + extra_shift))
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& ((1 << operand->bits) - 1));
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(*info->fprintf_func) (info->stream, "d%ld", value);
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}
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else if ((operand->flags & MN10200_OPERAND_AREG) != 0)
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{
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value = ((insn >> (operand->shift + extra_shift))
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& ((1 << operand->bits) - 1));
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(*info->fprintf_func) (info->stream, "a%ld", value);
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}
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else if ((operand->flags & MN10200_OPERAND_PSW) != 0)
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(*info->fprintf_func) (info->stream, "psw");
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else if ((operand->flags & MN10200_OPERAND_MDR) != 0)
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(*info->fprintf_func) (info->stream, "mdr");
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else if ((operand->flags & MN10200_OPERAND_PAREN) != 0)
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{
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if (paren)
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(*info->fprintf_func) (info->stream, ")");
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else
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{
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(*info->fprintf_func) (info->stream, "(");
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nocomma = 1;
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}
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paren = !paren;
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}
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else if ((operand->flags & MN10200_OPERAND_PCREL) != 0)
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(*info->print_address_func)
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((value + memaddr + mysize) & 0xffffff, info);
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else if ((operand->flags & MN10200_OPERAND_MEMADDR) != 0)
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(*info->print_address_func) (value, info);
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else
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(*info->fprintf_func) (info->stream, "%ld", value);
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}
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/* All done. */
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break;
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}
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op++;
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}
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if (!match)
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(*info->fprintf_func) (info->stream, _("unknown\t0x%04lx"), insn);
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}
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int
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print_insn_mn10200 (bfd_vma memaddr, struct disassemble_info *info)
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{
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int status;
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bfd_byte buffer[4];
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unsigned long insn;
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unsigned long extension = 0;
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unsigned int consume;
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/* First figure out how big the opcode is. */
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status = (*info->read_memory_func) (memaddr, buffer, 1, info);
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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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insn = *(unsigned char *) buffer;
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/* These are one byte insns. */
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if ((insn & 0xf0) == 0x00
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|| (insn & 0xf0) == 0x10
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|| (insn & 0xf0) == 0x20
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|| (insn & 0xf0) == 0x30
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|| ((insn & 0xf0) == 0x80
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&& (insn & 0x0c) >> 2 != (insn & 0x03))
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|| (insn & 0xf0) == 0x90
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|| (insn & 0xf0) == 0xa0
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|| (insn & 0xf0) == 0xb0
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|| (insn & 0xff) == 0xeb
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|| (insn & 0xff) == 0xf6
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|| (insn & 0xff) == 0xfe
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|| (insn & 0xff) == 0xff)
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{
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extension = 0;
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consume = 1;
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}
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/* These are two byte insns. */
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else if ((insn & 0xf0) == 0x40
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|| (insn & 0xf0) == 0x50
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|| (insn & 0xf0) == 0x60
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|| (insn & 0xf0) == 0x70
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|| (insn & 0xf0) == 0x80
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|| (insn & 0xfc) == 0xd0
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|| (insn & 0xfc) == 0xd4
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|| (insn & 0xfc) == 0xd8
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|| (insn & 0xfc) == 0xe0
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|| (insn & 0xfc) == 0xe4
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|| (insn & 0xff) == 0xe8
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|| (insn & 0xff) == 0xe9
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|| (insn & 0xff) == 0xea
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|| (insn & 0xff) == 0xf0
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|| (insn & 0xff) == 0xf1
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|| (insn & 0xff) == 0xf2
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|| (insn & 0xff) == 0xf3)
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{
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status = (*info->read_memory_func) (memaddr, buffer, 2, info);
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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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insn = bfd_getb16 (buffer);
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consume = 2;
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}
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/* These are three byte insns with a 16bit operand in little
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endian form. */
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else if ((insn & 0xf0) == 0xc0
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|| (insn & 0xfc) == 0xdc
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|| (insn & 0xfc) == 0xec
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|| (insn & 0xff) == 0xf8
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|| (insn & 0xff) == 0xf9
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|| (insn & 0xff) == 0xfa
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|| (insn & 0xff) == 0xfb
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|| (insn & 0xff) == 0xfc
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|| (insn & 0xff) == 0xfd)
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{
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status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
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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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insn <<= 16;
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insn |= bfd_getl16 (buffer);
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extension = 0;
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consume = 3;
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}
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/* These are three byte insns too, but we don't have to mess with
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endianness stuff. */
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else if ((insn & 0xff) == 0xf5)
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{
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status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
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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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insn <<= 16;
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insn |= bfd_getb16 (buffer);
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extension = 0;
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consume = 3;
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}
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/* These are four byte insns. */
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else if ((insn & 0xff) == 0xf7)
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{
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status = (*info->read_memory_func) (memaddr, buffer, 2, info);
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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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insn = bfd_getb16 (buffer);
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insn <<= 16;
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status = (*info->read_memory_func) (memaddr + 2, buffer, 2, info);
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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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insn |= bfd_getl16 (buffer);
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extension = 0;
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consume = 4;
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}
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/* These are five byte insns. */
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else if ((insn & 0xff) == 0xf4)
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{
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status = (*info->read_memory_func) (memaddr, buffer, 2, info);
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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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insn = bfd_getb16 (buffer);
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insn <<= 16;
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status = (*info->read_memory_func) (memaddr + 4, buffer, 1, info);
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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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insn |= (*(unsigned char *)buffer << 8) & 0xff00;
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status = (*info->read_memory_func) (memaddr + 3, buffer, 1, info);
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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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insn |= (*(unsigned char *)buffer) & 0xff;
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status = (*info->read_memory_func) (memaddr + 2, buffer, 1, info);
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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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extension = (*(unsigned char *)buffer) & 0xff;
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consume = 5;
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}
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else
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{
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(*info->fprintf_func) (info->stream, _("unknown\t0x%02lx"), insn);
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return 1;
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}
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disassemble (memaddr, info, insn, extension, consume);
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return consume;
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}
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