253 lines
7.4 KiB
C
253 lines
7.4 KiB
C
/* s390-dis.c -- Disassemble S390 instructions
|
|
Copyright 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
|
|
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
|
|
|
|
This file is part of GDB, GAS and the 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., 51 Franklin Street - Fifth Floor, Boston, MA
|
|
02110-1301, USA. */
|
|
|
|
#include <stdio.h>
|
|
#include "ansidecl.h"
|
|
#include "sysdep.h"
|
|
#include "dis-asm.h"
|
|
#include "opcode/s390.h"
|
|
|
|
static int init_flag = 0;
|
|
static int opc_index[256];
|
|
static int current_arch_mask = 0;
|
|
|
|
/* Set up index table for first opcode byte. */
|
|
|
|
static void
|
|
init_disasm (struct disassemble_info *info)
|
|
{
|
|
const struct s390_opcode *opcode;
|
|
const struct s390_opcode *opcode_end;
|
|
|
|
memset (opc_index, 0, sizeof (opc_index));
|
|
opcode_end = s390_opcodes + s390_num_opcodes;
|
|
for (opcode = s390_opcodes; opcode < opcode_end; opcode++)
|
|
{
|
|
opc_index[(int) opcode->opcode[0]] = opcode - s390_opcodes;
|
|
while ((opcode < opcode_end) &&
|
|
(opcode[1].opcode[0] == opcode->opcode[0]))
|
|
opcode++;
|
|
}
|
|
switch (info->mach)
|
|
{
|
|
case bfd_mach_s390_31:
|
|
current_arch_mask = 1 << S390_OPCODE_ESA;
|
|
break;
|
|
case bfd_mach_s390_64:
|
|
current_arch_mask = 1 << S390_OPCODE_ZARCH;
|
|
break;
|
|
default:
|
|
abort ();
|
|
}
|
|
init_flag = 1;
|
|
}
|
|
|
|
/* Extracts an operand value from an instruction. */
|
|
|
|
static inline unsigned int
|
|
s390_extract_operand (unsigned char *insn, const struct s390_operand *operand)
|
|
{
|
|
unsigned int val;
|
|
int bits;
|
|
|
|
/* Extract fragments of the operand byte for byte. */
|
|
insn += operand->shift / 8;
|
|
bits = (operand->shift & 7) + operand->bits;
|
|
val = 0;
|
|
do
|
|
{
|
|
val <<= 8;
|
|
val |= (unsigned int) *insn++;
|
|
bits -= 8;
|
|
}
|
|
while (bits > 0);
|
|
val >>= -bits;
|
|
val &= ((1U << (operand->bits - 1)) << 1) - 1;
|
|
|
|
/* Check for special long displacement case. */
|
|
if (operand->bits == 20 && operand->shift == 20)
|
|
val = (val & 0xff) << 12 | (val & 0xfff00) >> 8;
|
|
|
|
/* Sign extend value if the operand is signed or pc relative. */
|
|
if ((operand->flags & (S390_OPERAND_SIGNED | S390_OPERAND_PCREL))
|
|
&& (val & (1U << (operand->bits - 1))))
|
|
val |= (-1U << (operand->bits - 1)) << 1;
|
|
|
|
/* Double value if the operand is pc relative. */
|
|
if (operand->flags & S390_OPERAND_PCREL)
|
|
val <<= 1;
|
|
|
|
/* Length x in an instructions has real length x + 1. */
|
|
if (operand->flags & S390_OPERAND_LENGTH)
|
|
val++;
|
|
return val;
|
|
}
|
|
|
|
/* Print a S390 instruction. */
|
|
|
|
int
|
|
print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info)
|
|
{
|
|
bfd_byte buffer[6];
|
|
const struct s390_opcode *opcode;
|
|
const struct s390_opcode *opcode_end;
|
|
unsigned int value;
|
|
int status, opsize, bufsize;
|
|
char separator;
|
|
|
|
if (init_flag == 0)
|
|
init_disasm (info);
|
|
|
|
/* The output looks better if we put 6 bytes on a line. */
|
|
info->bytes_per_line = 6;
|
|
|
|
/* Every S390 instruction is max 6 bytes long. */
|
|
memset (buffer, 0, 6);
|
|
status = (*info->read_memory_func) (memaddr, buffer, 6, info);
|
|
if (status != 0)
|
|
{
|
|
for (bufsize = 0; bufsize < 6; bufsize++)
|
|
if ((*info->read_memory_func) (memaddr, buffer, bufsize + 1, info) != 0)
|
|
break;
|
|
if (bufsize <= 0)
|
|
{
|
|
(*info->memory_error_func) (status, memaddr, info);
|
|
return -1;
|
|
}
|
|
/* Opsize calculation looks strange but it works
|
|
00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes,
|
|
11xxxxxx -> 6 bytes. */
|
|
opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1;
|
|
status = opsize > bufsize;
|
|
}
|
|
else
|
|
{
|
|
bufsize = 6;
|
|
opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1;
|
|
}
|
|
|
|
if (status == 0)
|
|
{
|
|
/* Find the first match in the opcode table. */
|
|
opcode_end = s390_opcodes + s390_num_opcodes;
|
|
for (opcode = s390_opcodes + opc_index[(int) buffer[0]];
|
|
(opcode < opcode_end) && (buffer[0] == opcode->opcode[0]);
|
|
opcode++)
|
|
{
|
|
const struct s390_operand *operand;
|
|
const unsigned char *opindex;
|
|
|
|
/* Check architecture. */
|
|
if (!(opcode->modes & current_arch_mask))
|
|
continue;
|
|
/* Check signature of the opcode. */
|
|
if ((buffer[1] & opcode->mask[1]) != opcode->opcode[1]
|
|
|| (buffer[2] & opcode->mask[2]) != opcode->opcode[2]
|
|
|| (buffer[3] & opcode->mask[3]) != opcode->opcode[3]
|
|
|| (buffer[4] & opcode->mask[4]) != opcode->opcode[4]
|
|
|| (buffer[5] & opcode->mask[5]) != opcode->opcode[5])
|
|
continue;
|
|
|
|
/* The instruction is valid. */
|
|
if (opcode->operands[0] != 0)
|
|
(*info->fprintf_func) (info->stream, "%s\t", opcode->name);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%s", opcode->name);
|
|
|
|
/* Extract the operands. */
|
|
separator = 0;
|
|
for (opindex = opcode->operands; *opindex != 0; opindex++)
|
|
{
|
|
unsigned int value;
|
|
|
|
operand = s390_operands + *opindex;
|
|
value = s390_extract_operand (buffer, operand);
|
|
|
|
if ((operand->flags & S390_OPERAND_INDEX) && value == 0)
|
|
continue;
|
|
if ((operand->flags & S390_OPERAND_BASE) &&
|
|
value == 0 && separator == '(')
|
|
{
|
|
separator = ',';
|
|
continue;
|
|
}
|
|
|
|
if (separator)
|
|
(*info->fprintf_func) (info->stream, "%c", separator);
|
|
|
|
if (operand->flags & S390_OPERAND_GPR)
|
|
(*info->fprintf_func) (info->stream, "%%r%i", value);
|
|
else if (operand->flags & S390_OPERAND_FPR)
|
|
(*info->fprintf_func) (info->stream, "%%f%i", value);
|
|
else if (operand->flags & S390_OPERAND_AR)
|
|
(*info->fprintf_func) (info->stream, "%%a%i", value);
|
|
else if (operand->flags & S390_OPERAND_CR)
|
|
(*info->fprintf_func) (info->stream, "%%c%i", value);
|
|
else if (operand->flags & S390_OPERAND_PCREL)
|
|
(*info->print_address_func) (memaddr + (int) value, info);
|
|
else if (operand->flags & S390_OPERAND_SIGNED)
|
|
(*info->fprintf_func) (info->stream, "%i", (int) value);
|
|
else
|
|
(*info->fprintf_func) (info->stream, "%i", value);
|
|
|
|
if (operand->flags & S390_OPERAND_DISP)
|
|
{
|
|
separator = '(';
|
|
}
|
|
else if (operand->flags & S390_OPERAND_BASE)
|
|
{
|
|
(*info->fprintf_func) (info->stream, ")");
|
|
separator = ',';
|
|
}
|
|
else
|
|
separator = ',';
|
|
}
|
|
|
|
/* Found instruction, printed it, return its size. */
|
|
return opsize;
|
|
}
|
|
/* No matching instruction found, fall through to hex print. */
|
|
}
|
|
|
|
if (bufsize >= 4)
|
|
{
|
|
value = (unsigned int) buffer[0];
|
|
value = (value << 8) + (unsigned int) buffer[1];
|
|
value = (value << 8) + (unsigned int) buffer[2];
|
|
value = (value << 8) + (unsigned int) buffer[3];
|
|
(*info->fprintf_func) (info->stream, ".long\t0x%08x", value);
|
|
return 4;
|
|
}
|
|
else if (bufsize >= 2)
|
|
{
|
|
value = (unsigned int) buffer[0];
|
|
value = (value << 8) + (unsigned int) buffer[1];
|
|
(*info->fprintf_func) (info->stream, ".short\t0x%04x", value);
|
|
return 2;
|
|
}
|
|
else
|
|
{
|
|
value = (unsigned int) buffer[0];
|
|
(*info->fprintf_func) (info->stream, ".byte\t0x%02x", value);
|
|
return 1;
|
|
}
|
|
}
|