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binutils-gdb/opcodes/z8k-dis.c

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/* Disassemble z8000 code.
Copyright (C) 1992-2019 Free Software Foundation, Inc.
This file is part of the GNU opcodes library.
This library 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 3, or (at your option)
any later version.
It 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 file; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "disassemble.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;
OPCODES_SIGJMP_BUF bailout;
int 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 (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);
OPCODES_SIGLONGJMP (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"
};
static char *ctrl_names[8] =
{
"<invld>",
"flags",
"fcw",
"refresh",
"psapseg",
"psapoff",
"nspseg",
"nspoff"
};
static int seg_length;
int z8k_lookup_instr (unsigned char *, disassemble_info *);
static void output_instr (instr_data_s *, unsigned long, disassemble_info *);
static void unpack_instr (instr_data_s *, int, disassemble_info *);
static void unparse_instr (instr_data_s *, int);
static int
print_insn_z8k (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 (OPCODES_SIGSETJMP (instr_data.bailout) != 0)
/* Error return. */
return -1;
info->bytes_per_chunk = 2;
info->bytes_per_line = 6;
info->display_endian = BFD_ENDIAN_BIG;
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, is_segmented);
output_instr (&instr_data, addr, info);
return z8k_table[instr_data.tabl_index].length + seg_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 (bfd_vma addr, disassemble_info *info)
{
return print_insn_z8k (addr, info, 1);
}
int
print_insn_z8002 (bfd_vma addr, disassemble_info *info)
{
return print_insn_z8k (addr, info, 0);
}
int
z8k_lookup_instr (unsigned char *nibbles, disassemble_info *info)
{
int nibl_index, tabl_index;
int nibl_matched;
int need_fetch = 0;
unsigned short instr_nibl;
unsigned short tabl_datum, datum_class, datum_value;
nibl_matched = 0;
tabl_index = 0;
FETCH_DATA (info, 4);
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 data only if it isn't already there. */
if (nibl_index >= 4 || (nibl_index < 4 && need_fetch))
FETCH_DATA (info, nibl_index + 4); /* Fetch one word at a time. */
if (nibl_index < 4)
need_fetch = 0;
else
need_fetch = 1;
}
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_IGNORE:
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_s *instr_data,
unsigned long addr ATTRIBUTE_UNUSED,
disassemble_info *info)
{
int num_bytes;
char out_str[100];
out_str[0] = 0;
num_bytes = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
FETCH_DATA (info, num_bytes);
strcat (out_str, instr_data->instr_asmsrc);
(*info->fprintf_func) (info->stream, "%s", out_str);
}
static void
unpack_instr (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 int tabl_datum, datum_class;
unsigned short datum_value;
nibl_count = 0;
loop = 0;
seg_length = 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 & ~1];
instr_word = instr_data->words[nibl_count & ~3];
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_DISP:
switch (datum_value)
{
case ARG_DISP16:
instr_data->displacement = instr_data->insn_start + 4
+ (signed short) (instr_word & 0xffff);
nibl_count += 3;
break;
case ARG_DISP12:
if (instr_word & 0x800)
/* Negative 12 bit displacement. */
instr_data->displacement = instr_data->insn_start + 2
- (signed short) ((instr_word & 0xfff) | 0xf000) * 2;
else
instr_data->displacement = instr_data->insn_start + 2
- (instr_word & 0x0fff) * 2;
nibl_count += 2;
break;
default:
break;
}
break;
case CLASS_IMM:
switch (datum_value)
{
case ARG_IMM4:
instr_data->immediate = instr_nibl;
break;
case ARG_NIM4:
instr_data->immediate = (- instr_nibl) & 0xf;
break;
case ARG_NIM8:
instr_data->immediate = (- instr_byte) & 0xff;
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_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) << 16)
+ (instr_long & 0xffff);
nibl_count += 7;
seg_length = 2;
}
else
{
instr_data->address = ((instr_word & 0x7f00) << 16)
+ (instr_word & 0x00ff);
nibl_count += 3;
}
}
else
{
instr_data->address = instr_word;
nibl_count += 3;
}
break;
case CLASS_0CCC:
case CLASS_1CCC:
instr_data->ctrl_code = instr_nibl & 0x7;
break;
case CLASS_0DISP7:
instr_data->displacement =
instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
nibl_count += 1;
break;
case CLASS_1DISP7:
instr_data->displacement =
instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
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_IGNORE:
case CLASS_BIT:
instr_data->ctrl_code = instr_nibl & 0x7;
break;
case CLASS_FLAGS:
instr_data->flags = instr_nibl;
break;
case CLASS_REG:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_REGN0:
instr_data->arg_reg[datum_value] = instr_nibl;
break;
case CLASS_DISP8:
instr_data->displacement =
instr_data->insn_start + 2 + (signed char) instr_byte * 2;
nibl_count += 1;
break;
case CLASS_BIT_1OR2:
instr_data->immediate = ((instr_nibl >> 1) & 0x1) + 1;
nibl_count += 1;
break;
default:
abort ();
break;
}
loop += 1;
nibl_count += 1;
}
}
static void
print_intr(char *tmp_str, unsigned long interrupts)
{
int comma = 0;
*tmp_str = 0;
if (! (interrupts & 2))
{
strcat (tmp_str, "vi");
comma = 1;
}
if (! (interrupts & 1))
{
if (comma) strcat (tmp_str, ",");
strcat (tmp_str, "nvi");
}
}
static void
print_flags(char *tmp_str, unsigned long flags)
{
int comma = 0;
*tmp_str = 0;
if (flags & 8)
{
strcat (tmp_str, "c");
comma = 1;
}
if (flags & 4)
{
if (comma) strcat (tmp_str, ",");
strcat (tmp_str, "z");
comma = 1;
}
if (flags & 2)
{
if (comma) strcat (tmp_str, ",");
strcat (tmp_str, "s");
comma = 1;
}
if (flags & 1)
{
if (comma) strcat (tmp_str, ",");
strcat (tmp_str, "p");
}
}
static void
unparse_instr (instr_data_s *instr_data, int is_segmented)
{
unsigned short datum_value;
unsigned int tabl_datum, datum_class;
int loop, loop_limit;
char out_str[80], tmp_str[25];
sprintf (out_str, "%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:
if (is_segmented)
sprintf (tmp_str, "rr%ld(#0x%lx)", instr_data->arg_reg[datum_value],
instr_data->immediate);
else
sprintf (tmp_str, "r%ld(#0x%lx)", instr_data->arg_reg[datum_value],
instr_data->immediate);
strcat (out_str, tmp_str);
break;
case CLASS_BX:
if (is_segmented)
sprintf (tmp_str, "rr%ld(r%ld)", instr_data->arg_reg[datum_value],
instr_data->arg_reg[ARG_RX]);
else
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:
if (datum_value == ARG_IMM2) /* True with EI/DI instructions only. */
{
print_intr (tmp_str, instr_data->interrupts);
strcat (out_str, tmp_str);
break;
}
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, "%s", ctrl_names[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:
if (is_segmented)
sprintf (tmp_str, "@rr%ld", instr_data->arg_reg[datum_value]);
else
sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
case CLASS_IRO:
sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
case CLASS_FLAGS:
print_flags(tmp_str, 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;
case CLASS_PR:
if (is_segmented)
sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
else
sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
strcat (out_str, tmp_str);
break;
default:
abort ();
break;
}
}
strcpy (instr_data->instr_asmsrc, out_str);
}
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