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binutils-gdb/opcodes/z8k-dis.c

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19990502 sourceware import
1999-05-03 09:29:11 +02:00
/* Disassemble z8000 code.
Copyright 1992, 1993, 1995, 1998 Free Software Foundation, Inc.
This file is part of GNU Binutils.
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 <ansidecl.h>
#include "sysdep.h"
#include "dis-asm.h"
#define DEFINE_TABLE
#include "z8k-opc.h"
#include <setjmp.h>
typedef struct
{
/* These are all indexed by nibble number (i.e only every other entry
of bytes is used, and every 4th entry of words). */
unsigned char nibbles[24];
unsigned char bytes[24];
unsigned short words[24];
/* Nibble number of first word not yet fetched. */
int max_fetched;
bfd_vma insn_start;
jmp_buf bailout;
long tabl_index;
char instr_asmsrc[80];
unsigned long arg_reg[0x0f];
unsigned long immediate;
unsigned long displacement;
unsigned long address;
unsigned long cond_code;
unsigned long ctrl_code;
unsigned long flags;
unsigned long interrupts;
}
instr_data_s;
/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
to ADDR (exclusive) are valid. Returns 1 for success, longjmps
on error. */
#define FETCH_DATA(info, nibble) \
((nibble) < ((instr_data_s *)(info->private_data))->max_fetched \
? 1 : fetch_data ((info), (nibble)))
static int
fetch_data (info, nibble)
struct disassemble_info *info;
int nibble;
{
unsigned char mybuf[20];
int status;
instr_data_s *priv = (instr_data_s *)info->private_data;
if ((nibble % 4) != 0)
abort ();
status = (*info->read_memory_func) (priv->insn_start,
(bfd_byte *) mybuf,
nibble / 2,
info);
if (status != 0)
{
(*info->memory_error_func) (status, priv->insn_start, info);
longjmp (priv->bailout, 1);
}
{
int i;
unsigned char *p = mybuf ;
for (i = 0; i < nibble;)
{
priv->words[i] = (p[0] << 8) | p[1];
priv->bytes[i] = *p;
priv->nibbles[i++] = *p >> 4;
priv->nibbles[i++] = *p &0xf;
++p;
priv->bytes[i] = *p;
priv->nibbles[i++] = *p >> 4;
priv->nibbles[i++] = *p & 0xf;
++p;
}
}
priv->max_fetched = nibble;
return 1;
}
static char *codes[16] =
{
"f",
"lt",
"le",
"ule",
"ov/pe",
"mi",
"eq",
"c/ult",
"t",
"ge",
"gt",
"ugt",
"nov/po",
"pl",
"ne",
"nc/uge"
};
int z8k_lookup_instr PARAMS ((unsigned char*, disassemble_info *));
static void output_instr
PARAMS ((instr_data_s *, unsigned long, disassemble_info *));
static void unpack_instr PARAMS ((instr_data_s *, int, disassemble_info *));
static void unparse_instr PARAMS ((instr_data_s *));
static int
print_insn_z8k (addr, info, is_segmented)
bfd_vma addr;
disassemble_info *info;
int is_segmented;
{
instr_data_s instr_data;
info->private_data = (PTR) &instr_data;
instr_data.max_fetched = 0;
instr_data.insn_start = addr;
if (setjmp (instr_data.bailout) != 0)
/* Error return. */
return -1;
instr_data.tabl_index = z8k_lookup_instr (instr_data.nibbles, info);
if (instr_data.tabl_index > 0)
{
unpack_instr (&instr_data, is_segmented, info);
unparse_instr (&instr_data);
output_instr (&instr_data, addr, info);
return z8k_table[instr_data.tabl_index].length;
}
else
{
FETCH_DATA (info, 4);
(*info->fprintf_func) (info->stream, ".word %02x%02x",
instr_data.bytes[0], instr_data.bytes[2]);
return 2;
}
}
int
print_insn_z8001 (addr, info)
bfd_vma addr;
disassemble_info *info;
{
return print_insn_z8k (addr, info, 1);
}
int
print_insn_z8002 (addr, info)
bfd_vma addr;
disassemble_info *info;
{
return print_insn_z8k (addr, info, 0);
}
int
z8k_lookup_instr (nibbles, info)
unsigned char *nibbles;
disassemble_info *info;
{
int nibl_index, tabl_index;
int nibl_matched;
unsigned short instr_nibl;
unsigned short tabl_datum, datum_class, datum_value;
nibl_matched = 0;
tabl_index = 0;
while (!nibl_matched && z8k_table[tabl_index].name)
{
nibl_matched = 1;
for (nibl_index = 0; nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched; nibl_index++)
{
if ((nibl_index % 4) == 0)
/* Fetch one word at a time. */
FETCH_DATA (info, nibl_index + 4);
instr_nibl = nibbles[nibl_index];
tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
datum_class = tabl_datum & CLASS_MASK;
datum_value = ~CLASS_MASK & tabl_datum;
switch (datum_class)
{
case CLASS_BIT:
if (datum_value != instr_nibl)
nibl_matched = 0;
break;
case CLASS_00II:
if (!((~instr_nibl) & 0x4))
nibl_matched = 0;
break;
case CLASS_01II:
if (!(instr_nibl & 0x4))
nibl_matched = 0;
break;
case CLASS_0CCC:
if (!((~instr_nibl) & 0x8))
nibl_matched = 0;
break;
case CLASS_1CCC:
if (!(instr_nibl & 0x8))
nibl_matched = 0;
break;
case CLASS_0DISP7:
if (!((~instr_nibl) & 0x8))
nibl_matched = 0;
nibl_index += 1;
break;
case CLASS_1DISP7:
if (!(instr_nibl & 0x8))
nibl_matched = 0;
nibl_index += 1;
break;
case CLASS_REGN0:
if (instr_nibl == 0)
nibl_matched = 0;
break;
case CLASS_BIT_1OR2:
if ((instr_nibl | 0x2) != (datum_value | 0x2))
nibl_matched = 0;
break;
default:
break;
}
}
if (nibl_matched)
{
return tabl_index;
}
tabl_index++;
}
return -1;
}
static void
output_instr (instr_data, addr, info)
instr_data_s *instr_data;
unsigned long addr;
disassemble_info *info;
{
int loop, loop_limit;
char tmp_str[20];
char out_str[100];
strcpy (out_str, "\t");
loop_limit = z8k_table[instr_data->tabl_index].length * 2;
FETCH_DATA (info, loop_limit);
for (loop = 0; loop < loop_limit; loop++)
{
sprintf (tmp_str, "%x", instr_data->nibbles[loop]);
strcat (out_str, tmp_str);
}
while (loop++ < 8)
{
strcat (out_str, " ");
}
strcat (out_str, instr_data->instr_asmsrc);
(*info->fprintf_func) (info->stream, "%s", out_str);
}
static void
unpack_instr (instr_data, is_segmented, info)
instr_data_s *instr_data;
int is_segmented;
disassemble_info *info;
{
int nibl_count, loop;
unsigned short instr_nibl, instr_byte, instr_word;
long instr_long;
unsigned short tabl_datum, datum_class, datum_value;
nibl_count = 0;
loop = 0;
while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
{
FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
instr_nibl = instr_data->nibbles[nibl_count];
instr_byte = instr_data->bytes[nibl_count];
instr_word = instr_data->words[nibl_count];
tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
datum_class = tabl_datum & CLASS_MASK;
datum_value = tabl_datum & ~CLASS_MASK;
switch (datum_class)
{
case CLASS_X:
instr_data->address = instr_nibl;
break;
case CLASS_BA:
instr_data->displacement = instr_nibl;
break;
case CLASS_BX:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_DISP:
switch (datum_value)
{
case ARG_DISP16:
instr_data->displacement = instr_word;
nibl_count += 3;
break;
case ARG_DISP12:
instr_data->displacement = instr_word & 0x0fff;
nibl_count += 2;
break;
default:
break;
}
break;
case CLASS_IMM:
switch (datum_value)
{
case ARG_IMM4:
instr_data->immediate = instr_nibl;
break;
case ARG_NIM8:
instr_data->immediate = (-instr_byte);
nibl_count += 1;
break;
case ARG_IMM8:
instr_data->immediate = instr_byte;
nibl_count += 1;
break;
case ARG_IMM16:
instr_data->immediate = instr_word;
nibl_count += 3;
break;
case ARG_IMM32:
FETCH_DATA (info, nibl_count + 8);
instr_long = (instr_data->words[nibl_count] << 16)
| (instr_data->words[nibl_count + 4]);
instr_data->immediate = instr_long;
nibl_count += 7;
break;
case ARG_IMMN:
instr_data->immediate = instr_nibl - 1;
break;
case ARG_IMM4M1:
instr_data->immediate = instr_nibl + 1;
break;
case ARG_IMM_1:
instr_data->immediate = 1;
break;
case ARG_IMM_2:
instr_data->immediate = 2;
break;
case ARG_IMM2:
instr_data->immediate = instr_nibl & 0x3;
break;
default:
break;
}
break;
case CLASS_CC:
instr_data->cond_code = instr_nibl;
break;
case CLASS_CTRL:
instr_data->ctrl_code = instr_nibl;
break;
case CLASS_DA:
case CLASS_ADDRESS:
if (is_segmented)
{
if (instr_nibl & 0x8)
{
FETCH_DATA (info, nibl_count + 8);
instr_long = (instr_data->words[nibl_count] << 16)
| (instr_data->words[nibl_count + 4]);
instr_data->address = ((instr_word & 0x7f00) << 8) +
(instr_long & 0xffff);
nibl_count += 7;
}
else
{
instr_data->address = ((instr_word & 0x7f00) << 8) +
(instr_word & 0x00ff);
nibl_count += 3;
}
}
else
{
instr_data->address = instr_word;
nibl_count += 3;
}
break;
case CLASS_0CCC:
instr_data->cond_code = instr_nibl & 0x7;
break;
case CLASS_1CCC:
instr_data->cond_code = instr_nibl & 0x7;
break;
case CLASS_0DISP7:
instr_data->displacement = instr_byte & 0x7f;
nibl_count += 1;
break;
case CLASS_1DISP7:
instr_data->displacement = instr_byte & 0x7f;
nibl_count += 1;
break;
case CLASS_01II:
instr_data->interrupts = instr_nibl & 0x3;
break;
case CLASS_00II:
instr_data->interrupts = instr_nibl & 0x3;
break;
case CLASS_BIT:
/* do nothing */
break;
case CLASS_IR:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_FLAGS:
instr_data->flags = instr_nibl;
break;
case CLASS_REG:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_REG_BYTE:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_REG_WORD:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_REG_QUAD:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_REG_LONG:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_REGN0:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
default:
break;
}
loop += 1;
nibl_count += 1;
}
}
static void
unparse_instr (instr_data)
instr_data_s *instr_data;
{
unsigned short tabl_datum, datum_class, datum_value;
int loop, loop_limit;
char out_str[80], tmp_str[25];
sprintf (out_str, "\t%s\t", z8k_table[instr_data->tabl_index].name);
loop_limit = z8k_table[instr_data->tabl_index].noperands;
for (loop = 0; loop < loop_limit; loop++)
{
if (loop)
strcat (out_str, ",");
tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
datum_class = tabl_datum & CLASS_MASK;
datum_value = tabl_datum & ~CLASS_MASK;
switch (datum_class)
{
case CLASS_X:
sprintf (tmp_str, "0x%0lx(R%ld)", instr_data->address,
instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
case CLASS_BA:
sprintf (tmp_str, "r%ld(#%lx)", instr_data->arg_reg[datum_value],
instr_data->immediate);
strcat (out_str, tmp_str);
break;
case CLASS_BX:
sprintf (tmp_str, "r%ld(R%ld)", instr_data->arg_reg[datum_value],
instr_data->arg_reg[ARG_RX]);
strcat (out_str, tmp_str);
break;
case CLASS_DISP:
sprintf (tmp_str, "#0x%0lx", instr_data->displacement);
strcat (out_str, tmp_str);
break;
case CLASS_IMM:
sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
strcat (out_str, tmp_str);
break;
case CLASS_CC:
sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
strcat (out_str, tmp_str);
break;
case CLASS_CTRL:
sprintf (tmp_str, "0x%0lx", instr_data->ctrl_code);
strcat (out_str, tmp_str);
break;
case CLASS_DA:
case CLASS_ADDRESS:
sprintf (tmp_str, "#0x%0lx", instr_data->address);
strcat (out_str, tmp_str);
break;
case CLASS_IR:
sprintf (tmp_str, "@R%ld", instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
case CLASS_FLAGS:
sprintf (tmp_str, "0x%0lx", instr_data->flags);
strcat (out_str, tmp_str);
break;
case CLASS_REG_BYTE:
if (instr_data->arg_reg[datum_value] >= 0x8)
{
sprintf (tmp_str, "rl%ld",
instr_data->arg_reg[datum_value] - 0x8);
}
else
{
sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
}
strcat (out_str, tmp_str);
break;
case CLASS_REG_WORD:
sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
case CLASS_REG_QUAD:
sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
case CLASS_REG_LONG:
sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
default:
break;
}
}
strcpy (instr_data->instr_asmsrc, out_str);
}