/* s390-dis.c -- Disassemble S390 instructions
- Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+ Copyright 2000, 2001, 2002, 2003, 2005, 2007, 2008
+ Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
- This file is part of GDB, GAS and the GNU binutils.
+ This file is part of the GNU opcodes library.
- This program is free software; you can redistribute it and/or modify
+ 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 2 of the License, or
- (at your option) any later version.
+ the Free Software Foundation; either version 3, 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.
+ 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 program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ 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 <stdio.h>
#include "ansidecl.h"
#include "sysdep.h"
#include "dis-asm.h"
+#include "opintl.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(info)
- struct disassemble_info *info ATTRIBUTE_UNUSED;
+/* 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;
+ const char *p;
- memset(opc_index, 0, sizeof(opc_index));
+ 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_esa:
- current_arch_mask = 1 << S390_OPCODE_ESA;
- break;
- case bfd_mach_s390_esame:
- current_arch_mask = 1 << S390_OPCODE_ESAME;
- break;
- default:
- abort();
- }
+ 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++;
+ }
+
+ for (p = info->disassembler_options; p != NULL; )
+ {
+ if (CONST_STRNEQ (p, "esa"))
+ current_arch_mask = 1 << S390_OPCODE_ESA;
+ else if (CONST_STRNEQ (p, "zarch"))
+ current_arch_mask = 1 << S390_OPCODE_ZARCH;
+ else
+ fprintf (stderr, "Unknown S/390 disassembler option: %s\n", p);
+
+ p = strchr (p, ',');
+ if (p != NULL)
+ p++;
+ }
+
+ if (!current_arch_mask)
+ 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. */
+/* We do not perform the shift operation for larl-type address
+ operands here since that would lead to an overflow of the 32 bit
+ integer value. Instead the shift operation is done when printing
+ the operand in print_insn_s390. */
static inline unsigned int
-s390_extract_operand (insn, operand)
- unsigned char *insn;
- const struct s390_operand *operand;
+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;
+ /* 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);
+ do
+ {
+ val <<= 8;
+ val |= (unsigned int) *insn++;
+ bits -= 8;
+ }
+ while (bits > 0);
val >>= -bits;
- val &= ((1U << (operand->bits-1))<<1) - 1;
-
- /* 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 */
+ 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;
+
+ /* 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 (memaddr, info)
- bfd_vma memaddr;
- struct disassemble_info *info;
+print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info)
{
bfd_byte buffer[6];
const struct s390_opcode *opcode;
char separator;
if (init_flag == 0)
- init_disasm(info);
+ 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);
+ 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;
+ 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;
}
- /* 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->architecture & 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 = ',';
- }
+ else
+ {
+ bufsize = 6;
+ opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1;
+ }
+
+ if (status == 0)
+ {
+ const struct s390_opcode *op;
+
+ /* 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;
- /* found instruction, printed it, return its size */
- return opsize;
+ /* 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;
+
+ /* Advance to an opcode with a more specific mask. */
+ for (op = opcode + 1; op < opcode_end; op++)
+ {
+ if ((buffer[0] & op->mask[0]) != op->opcode[0])
+ break;
+
+ if ((buffer[1] & op->mask[1]) != op->opcode[1]
+ || (buffer[2] & op->mask[2]) != op->opcode[2]
+ || (buffer[3] & op->mask[3]) != op->opcode[3]
+ || (buffer[4] & op->mask[4]) != op->opcode[4]
+ || (buffer[5] & op->mask[5]) != op->opcode[5])
+ continue;
+
+ if (((int)opcode->mask[0] + opcode->mask[1] +
+ opcode->mask[2] + opcode->mask[3] +
+ opcode->mask[4] + opcode->mask[5]) <
+ ((int)op->mask[0] + op->mask[1] +
+ op->mask[2] + op->mask[3] +
+ op->mask[4] + op->mask[5]))
+ opcode = op;
+ }
+
+ /* 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++)
+ {
+ 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 + (int)value,
+ info);
+ else if (operand->flags & S390_OPERAND_SIGNED)
+ (*info->fprintf_func) (info->stream, "%i", (int) value);
+ else
+ (*info->fprintf_func) (info->stream, "%u", 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;
}
- /* 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;
- }
+}
+
+void
+print_s390_disassembler_options (FILE *stream)
+{
+ fprintf (stream, _("\n\
+The following S/390 specific disassembler options are supported for use\n\
+with the -M switch (multiple options should be separated by commas):\n"));
+
+ fprintf (stream, _(" esa Disassemble in ESA architecture mode\n"));
+ fprintf (stream, _(" zarch Disassemble in z/Architecture mode\n"));
}