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4aa92185f8
* mn10300-opc.c (mn10300_opcodes): Fix masks on several insns. Selects opcodes & consumes bytes. Breaks badly if given data instead of code. No operands yet.
299 lines
7.6 KiB
C
299 lines
7.6 KiB
C
/* Disassemble MN10300 instructions.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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 program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include "ansidecl.h"
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#include "opcode/mn10300.h"
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#include "dis-asm.h"
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static void disassemble PARAMS ((bfd_vma, struct disassemble_info *,
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unsigned long insn, unsigned long,
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unsigned int));
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static const char *const mn10300_reg_names[] =
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{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", };
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int
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print_insn_mn10300 (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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int status;
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bfd_byte buffer[4];
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unsigned long insn;
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unsigned long extension;
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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 XXX imm8 versions of mov, cmp. */
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if ((insn & 0xf3) == 0x00
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|| (insn & 0xf0) == 0x10
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|| (insn & 0xfc) == 0x3c
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|| (insn & 0xf3) == 0x41
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|| (insn & 0xf3) == 0x40
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|| (insn & 0xfc) == 0x50
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|| (insn & 0xfc) == 0x54
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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 & 0x0c) >> 2 != (insn & 0x03))
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|| ((insn & 0xf0) == 0x90
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&& (insn & 0x0c) >> 2 != (insn & 0x03))
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|| ((insn & 0xf0) == 0xa0
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&& (insn & 0x0c) >> 2 != (insn & 0x03))
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|| ((insn & 0xf0) == 0xb0
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&& (insn & 0x0c) >> 2 != (insn & 0x03))
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|| (insn & 0xff) == 0xcb
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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 & 0xf0) == 0xe0)
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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) == 0x80
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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 & 0xfc) == 0x20
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|| (insn & 0xfc) == 0x28
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|| (insn & 0xf3) == 0x43
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|| (insn & 0xf3) == 0x42
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|| (insn & 0xfc) == 0x58
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|| (insn & 0xfc) == 0x5c
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|| ((insn & 0xf0) == 0xc0
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&& (insn & 0xff) != 0xcb
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&& (insn & 0xff) != 0xcc
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&& (insn & 0xff) != 0xcd)
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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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|| (insn & 0xff) == 0xf4
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|| (insn & 0xff) == 0xf5
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|| (insn & 0xff) == 0xf6)
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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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extension = 0;
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consume = 2;
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}
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/* These are three byte insns. */
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else if ((insn & 0xff) == 0xf8
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|| (insn & 0xff) == 0xcc
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|| (insn & 0xff) == 0xf9
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|| (insn & 0xf3) == 0x01
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|| (insn & 0xf3) == 0x02
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|| (insn & 0xf3) == 0x03
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|| (insn & 0xfc) == 0x24
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|| (insn & 0xfc) == 0x2c
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|| (insn & 0xfc) == 0x30
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|| (insn & 0xfc) == 0x34
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|| (insn & 0xfc) == 0x38
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|| (insn & 0xff) == 0xde
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|| (insn & 0xff) == 0xdf
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|| (insn & 0xff) == 0xcc)
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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 <<= 8;
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insn |= *(unsigned char *)buffer + 2;
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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) == 0xfa
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|| (insn & 0xff) == 0xfb)
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{
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status = (*info->read_memory_func) (memaddr, buffer, 4, 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_getb32 (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) == 0xcd
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|| (insn & 0xff) == 0xdc)
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{
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status = (*info->read_memory_func) (memaddr, buffer, 4, 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_getb32 (buffer);
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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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extension = *(unsigned char *) buffer + 4;
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consume = 5;
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}
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/* These are six byte insns. */
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else if ((insn & 0xff) == 0xfd
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|| (insn & 0xff) == 0xfc)
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{
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status = (*info->read_memory_func) (memaddr, buffer, 4, 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_getb32 (buffer);
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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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extension = bfd_getb16 (buffer + 4);
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consume = 6;
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}
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/* Else its a seven byte insns (in theory). */
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else
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{
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status = (*info->read_memory_func) (memaddr, buffer, 4, 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_getb32 (buffer);
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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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extension = bfd_getb16 (buffer);
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extension <<= 8;
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extension |= *(unsigned char *)buffer + 2;
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consume = 7;
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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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static void
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disassemble (memaddr, info, insn, extension, size)
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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 mn10300_opcode *op = (struct mn10300_opcode *)mn10300_opcodes;
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const struct mn10300_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;
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if (op->format == FMT_S0)
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mysize = 1;
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else if (op->format == FMT_S1
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|| op->format == FMT_D0)
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mysize = 2;
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else if (op->format == FMT_S2
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|| op->format == FMT_D1)
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mysize = 3;
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else if (op->format == FMT_S4)
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mysize = 5;
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else if (op->format == FMT_D2)
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mysize = 4;
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else if (op->format == FMT_D4)
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mysize = 6;
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else
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mysize = 7;
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if ((op->mask & insn) == op->opcode
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&& size == mysize)
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{
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const unsigned char *opindex_ptr;
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unsigned int opnum, memop;
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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, opnum = 1;
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*opindex_ptr != 0;
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opindex_ptr++, opnum++)
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{
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unsigned long value;
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operand = &mn10300_operands[*opindex_ptr];
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value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
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if ((operand->flags & MN10300_OPERAND_SIGNED) != 0)
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value = ((long)(value << (32 - operand->bits))
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>> (32 - operand->bits));
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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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{
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(*info->fprintf_func) (info->stream, "unknown\t0x%04x", insn);
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}
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}
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