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-rw-r--r--opcodes/s390-dis.c231
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diff --git a/opcodes/s390-dis.c b/opcodes/s390-dis.c
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-/* s390-dis.c -- Disassemble S390 instructions
- Copyright 2000, 2001 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., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, 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(info)
- struct disassemble_info *info ATTRIBUTE_UNUSED;
-{
- 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_esa:
- current_arch_mask = 1 << S390_OPCODE_ESA;
- break;
- case bfd_mach_s390_esame:
- current_arch_mask = 1 << S390_OPCODE_ESAME;
- break;
- default:
- abort();
- }
- init_flag = 1;
-}
-
-/* Extracts an operand value from an instruction. */
-
-static inline unsigned int
-s390_extract_operand (insn, 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;
-
- /* 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 (memaddr, info)
- 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->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 = ',';
- }
-
- /* 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;
- }
-}
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