253 lines
7.4 KiB
C
253 lines
7.4 KiB
C
/* s390-dis.c -- Disassemble S390 instructions
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Copyright 2000, 2001, 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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This file is part of the GNU opcodes library.
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with this file; see the file COPYING. If not, write to the
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Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include "ansidecl.h"
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#include "sysdep.h"
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#include "dis-asm.h"
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#include "opcode/s390.h"
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static int init_flag = 0;
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static int opc_index[256];
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static int current_arch_mask = 0;
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/* Set up index table for first opcode byte. */
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static void
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init_disasm (struct disassemble_info *info)
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{
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const struct s390_opcode *opcode;
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const struct s390_opcode *opcode_end;
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memset (opc_index, 0, sizeof (opc_index));
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opcode_end = s390_opcodes + s390_num_opcodes;
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for (opcode = s390_opcodes; opcode < opcode_end; opcode++)
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{
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opc_index[(int) opcode->opcode[0]] = opcode - s390_opcodes;
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while ((opcode < opcode_end) &&
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(opcode[1].opcode[0] == opcode->opcode[0]))
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opcode++;
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}
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switch (info->mach)
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{
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case bfd_mach_s390_31:
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current_arch_mask = 1 << S390_OPCODE_ESA;
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break;
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case bfd_mach_s390_64:
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current_arch_mask = 1 << S390_OPCODE_ZARCH;
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break;
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default:
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abort ();
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}
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init_flag = 1;
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}
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/* Extracts an operand value from an instruction. */
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static inline unsigned int
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s390_extract_operand (unsigned char *insn, const struct s390_operand *operand)
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{
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unsigned int val;
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int bits;
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/* Extract fragments of the operand byte for byte. */
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insn += operand->shift / 8;
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bits = (operand->shift & 7) + operand->bits;
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val = 0;
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do
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{
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val <<= 8;
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val |= (unsigned int) *insn++;
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bits -= 8;
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}
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while (bits > 0);
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val >>= -bits;
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val &= ((1U << (operand->bits - 1)) << 1) - 1;
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/* Check for special long displacement case. */
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if (operand->bits == 20 && operand->shift == 20)
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val = (val & 0xff) << 12 | (val & 0xfff00) >> 8;
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/* Sign extend value if the operand is signed or pc relative. */
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if ((operand->flags & (S390_OPERAND_SIGNED | S390_OPERAND_PCREL))
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&& (val & (1U << (operand->bits - 1))))
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val |= (-1U << (operand->bits - 1)) << 1;
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/* Double value if the operand is pc relative. */
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if (operand->flags & S390_OPERAND_PCREL)
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val <<= 1;
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/* Length x in an instructions has real length x + 1. */
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if (operand->flags & S390_OPERAND_LENGTH)
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val++;
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return val;
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}
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/* Print a S390 instruction. */
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int
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print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info)
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{
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bfd_byte buffer[6];
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const struct s390_opcode *opcode;
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const struct s390_opcode *opcode_end;
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unsigned int value;
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int status, opsize, bufsize;
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char separator;
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if (init_flag == 0)
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init_disasm (info);
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/* The output looks better if we put 6 bytes on a line. */
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info->bytes_per_line = 6;
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/* Every S390 instruction is max 6 bytes long. */
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memset (buffer, 0, 6);
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status = (*info->read_memory_func) (memaddr, buffer, 6, info);
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if (status != 0)
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{
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for (bufsize = 0; bufsize < 6; bufsize++)
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if ((*info->read_memory_func) (memaddr, buffer, bufsize + 1, info) != 0)
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break;
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if (bufsize <= 0)
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{
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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/* Opsize calculation looks strange but it works
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00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes,
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11xxxxxx -> 6 bytes. */
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opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1;
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status = opsize > bufsize;
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}
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else
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{
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bufsize = 6;
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opsize = ((((buffer[0] >> 6) + 1) >> 1) + 1) << 1;
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}
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if (status == 0)
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{
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/* Find the first match in the opcode table. */
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opcode_end = s390_opcodes + s390_num_opcodes;
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for (opcode = s390_opcodes + opc_index[(int) buffer[0]];
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(opcode < opcode_end) && (buffer[0] == opcode->opcode[0]);
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opcode++)
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{
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const struct s390_operand *operand;
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const unsigned char *opindex;
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/* Check architecture. */
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if (!(opcode->modes & current_arch_mask))
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continue;
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/* Check signature of the opcode. */
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if ((buffer[1] & opcode->mask[1]) != opcode->opcode[1]
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|| (buffer[2] & opcode->mask[2]) != opcode->opcode[2]
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|| (buffer[3] & opcode->mask[3]) != opcode->opcode[3]
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|| (buffer[4] & opcode->mask[4]) != opcode->opcode[4]
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|| (buffer[5] & opcode->mask[5]) != opcode->opcode[5])
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continue;
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/* The instruction is valid. */
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if (opcode->operands[0] != 0)
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(*info->fprintf_func) (info->stream, "%s\t", opcode->name);
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else
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(*info->fprintf_func) (info->stream, "%s", opcode->name);
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/* Extract the operands. */
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separator = 0;
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for (opindex = opcode->operands; *opindex != 0; opindex++)
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{
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unsigned int value;
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operand = s390_operands + *opindex;
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value = s390_extract_operand (buffer, operand);
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if ((operand->flags & S390_OPERAND_INDEX) && value == 0)
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continue;
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if ((operand->flags & S390_OPERAND_BASE) &&
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value == 0 && separator == '(')
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{
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separator = ',';
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continue;
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}
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if (separator)
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(*info->fprintf_func) (info->stream, "%c", separator);
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if (operand->flags & S390_OPERAND_GPR)
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(*info->fprintf_func) (info->stream, "%%r%i", value);
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else if (operand->flags & S390_OPERAND_FPR)
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(*info->fprintf_func) (info->stream, "%%f%i", value);
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else if (operand->flags & S390_OPERAND_AR)
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(*info->fprintf_func) (info->stream, "%%a%i", value);
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else if (operand->flags & S390_OPERAND_CR)
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(*info->fprintf_func) (info->stream, "%%c%i", value);
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else if (operand->flags & S390_OPERAND_PCREL)
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(*info->print_address_func) (memaddr + (int) value, info);
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else if (operand->flags & S390_OPERAND_SIGNED)
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(*info->fprintf_func) (info->stream, "%i", (int) value);
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else
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(*info->fprintf_func) (info->stream, "%u", value);
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if (operand->flags & S390_OPERAND_DISP)
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{
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separator = '(';
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}
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else if (operand->flags & S390_OPERAND_BASE)
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{
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(*info->fprintf_func) (info->stream, ")");
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separator = ',';
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}
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else
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separator = ',';
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}
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/* Found instruction, printed it, return its size. */
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return opsize;
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}
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/* No matching instruction found, fall through to hex print. */
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}
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if (bufsize >= 4)
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{
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value = (unsigned int) buffer[0];
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value = (value << 8) + (unsigned int) buffer[1];
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value = (value << 8) + (unsigned int) buffer[2];
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value = (value << 8) + (unsigned int) buffer[3];
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(*info->fprintf_func) (info->stream, ".long\t0x%08x", value);
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return 4;
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}
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else if (bufsize >= 2)
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{
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value = (unsigned int) buffer[0];
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value = (value << 8) + (unsigned int) buffer[1];
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(*info->fprintf_func) (info->stream, ".short\t0x%04x", value);
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return 2;
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}
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else
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{
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value = (unsigned int) buffer[0];
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(*info->fprintf_func) (info->stream, ".byte\t0x%02x", value);
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return 1;
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}
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}
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