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NetBSD/gnu/dist/opcodes/m10200-dis.c

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8.5 KiB
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/* Disassemble MN10200 instructions.
Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include "ansidecl.h"
#include "opcode/mn10200.h"
#include "dis-asm.h"
static void disassemble PARAMS ((bfd_vma, struct disassemble_info *,
unsigned long insn, unsigned long,
unsigned int));
int
print_insn_mn10200 (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
int status;
bfd_byte buffer[4];
unsigned long insn;
unsigned long extension = 0;
unsigned int consume;
/* First figure out how big the opcode is. */
status = (*info->read_memory_func) (memaddr, buffer, 1, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn = *(unsigned char *) buffer;
/* These are one byte insns. */
if ((insn & 0xf0) == 0x00
|| (insn & 0xf0) == 0x10
|| (insn & 0xf0) == 0x20
|| (insn & 0xf0) == 0x30
|| ((insn & 0xf0) == 0x80
&& (insn & 0x0c) >> 2 != (insn & 0x03))
|| (insn & 0xf0) == 0x90
|| (insn & 0xf0) == 0xa0
|| (insn & 0xf0) == 0xb0
|| (insn & 0xff) == 0xeb
|| (insn & 0xff) == 0xf6
|| (insn & 0xff) == 0xfe)
{
extension = 0;
consume = 1;
}
/* These are two byte insns. */
else if ((insn & 0xf0) == 0x40
|| (insn & 0xf0) == 0x50
|| (insn & 0xf0) == 0x60
|| (insn & 0xf0) == 0x70
|| (insn & 0xf0) == 0x80
|| (insn & 0xfc) == 0xd0
|| (insn & 0xfc) == 0xd4
|| (insn & 0xfc) == 0xd8
|| (insn & 0xfc) == 0xe0
|| (insn & 0xfc) == 0xe4
|| (insn & 0xff) == 0xe8
|| (insn & 0xff) == 0xe9
|| (insn & 0xff) == 0xea
|| (insn & 0xff) == 0xf0
|| (insn & 0xff) == 0xf1
|| (insn & 0xff) == 0xf2
|| (insn & 0xff) == 0xf3)
{
status = (*info->read_memory_func) (memaddr, buffer, 2, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn = bfd_getb16 (buffer);
consume = 2;
}
/* These are three byte insns with a 16bit operand in little
endian form. */
else if ((insn & 0xf0) == 0xc0
|| (insn & 0xfc) == 0xdc
|| (insn & 0xfc) == 0xec
|| (insn & 0xff) == 0xf8
|| (insn & 0xff) == 0xf9
|| (insn & 0xff) == 0xfa
|| (insn & 0xff) == 0xfb
|| (insn & 0xff) == 0xfc
|| (insn & 0xff) == 0xfd)
{
status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn <<= 16;
insn |= bfd_getl16 (buffer);
extension = 0;
consume = 3;
}
/* These are three byte insns too, but we don't have to mess with
endianness stuff. */
else if ((insn & 0xff) == 0xf5)
{
status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn <<= 16;
insn |= bfd_getb16 (buffer);
extension = 0;
consume = 3;
}
/* These are four byte insns. */
else if ((insn & 0xff) == 0xf7)
{
status = (*info->read_memory_func) (memaddr, buffer, 2, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn = bfd_getb16 (buffer);
insn <<= 16;
status = (*info->read_memory_func) (memaddr + 2, buffer, 2, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn |= bfd_getl16 (buffer);
extension = 0;
consume = 4;
}
/* These are five byte insns. */
else if ((insn & 0xff) == 0xf4)
{
status = (*info->read_memory_func) (memaddr, buffer, 2, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn = bfd_getb16 (buffer);
insn <<= 16;
status = (*info->read_memory_func) (memaddr + 4, buffer, 1, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn |= *(unsigned char *)buffer << 8;
status = (*info->read_memory_func) (memaddr + 3, buffer, 1, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn |= *(unsigned char *)buffer;
status = (*info->read_memory_func) (memaddr + 2, buffer, 1, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
extension = *(unsigned char *)buffer;
consume = 5;
}
else
return -1;
disassemble (memaddr, info, insn, extension, consume);
return consume;
}
static void
disassemble (memaddr, info, insn, extension, size)
bfd_vma memaddr;
struct disassemble_info *info;
unsigned long insn;
unsigned long extension;
unsigned int size;
{
struct mn10200_opcode *op = (struct mn10200_opcode *)mn10200_opcodes;
const struct mn10200_operand *operand;
int match = 0;
/* Find the opcode. */
while (op->name)
{
int mysize, extra_shift;
if (op->format == FMT_1)
mysize = 1;
else if (op->format == FMT_2
|| op->format == FMT_4)
mysize = 2;
else if (op->format == FMT_3
|| op->format == FMT_5)
mysize = 3;
else if (op->format == FMT_6)
mysize = 4;
else if (op->format == FMT_7)
mysize = 5;
else
abort ();
if (op->format == FMT_2 || op->format == FMT_5)
extra_shift = 8;
else if (op->format == FMT_3
|| op->format == FMT_6
|| op->format == FMT_7)
extra_shift = 16;
else
extra_shift = 0;
if ((op->mask & insn) == op->opcode
&& size == (unsigned int) mysize)
{
const unsigned char *opindex_ptr;
unsigned int nocomma;
int paren = 0;
match = 1;
(*info->fprintf_func) (info->stream, "%s\t", op->name);
/* Now print the operands. */
for (opindex_ptr = op->operands, nocomma = 1;
*opindex_ptr != 0;
opindex_ptr++)
{
unsigned long value;
operand = &mn10200_operands[*opindex_ptr];
if ((operand->flags & MN10200_OPERAND_EXTENDED) != 0)
{
value = (insn & 0xffff) << 8;
value |= extension;
}
else
{
value = ((insn >> (operand->shift))
& ((1 << operand->bits) - 1));
}
if ((operand->flags & MN10200_OPERAND_SIGNED) != 0)
value = ((long)(value << (32 - operand->bits))
>> (32 - operand->bits));
if (!nocomma
&& (!paren
|| ((operand->flags & MN10200_OPERAND_PAREN) == 0)))
(*info->fprintf_func) (info->stream, ",");
nocomma = 0;
if ((operand->flags & MN10200_OPERAND_DREG) != 0)
{
value = ((insn >> (operand->shift + extra_shift))
& ((1 << operand->bits) - 1));
(*info->fprintf_func) (info->stream, "d%d", value);
}
else if ((operand->flags & MN10200_OPERAND_AREG) != 0)
{
value = ((insn >> (operand->shift + extra_shift))
& ((1 << operand->bits) - 1));
(*info->fprintf_func) (info->stream, "a%d", value);
}
else if ((operand->flags & MN10200_OPERAND_PSW) != 0)
(*info->fprintf_func) (info->stream, "psw");
else if ((operand->flags & MN10200_OPERAND_MDR) != 0)
(*info->fprintf_func) (info->stream, "mdr");
else if ((operand->flags & MN10200_OPERAND_PAREN) != 0)
{
if (paren)
(*info->fprintf_func) (info->stream, ")");
else
{
(*info->fprintf_func) (info->stream, "(");
nocomma = 1;
}
paren = !paren;
}
else if ((operand->flags & MN10200_OPERAND_PCREL) != 0)
(*info->print_address_func) ((value + memaddr + mysize) & 0xffffff, info);
else if ((operand->flags & MN10200_OPERAND_MEMADDR) != 0)
(*info->print_address_func) (value, info);
else
(*info->fprintf_func) (info->stream, "%d", value);
}
/* All done. */
break;
}
op++;
}
if (!match)
{
(*info->fprintf_func) (info->stream, "unknown\t0x%04x", insn);
}
}
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