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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [opcodes/] [s390-dis.c] - Blame information for rev 157

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1 24 jeremybenn
/* 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
142
    {
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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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147
  if (status == 0)
148
    {
149
      /* Find the first match in the opcode table.  */
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      opcode_end = s390_opcodes + s390_num_opcodes;
151
      for (opcode = s390_opcodes + opc_index[(int) buffer[0]];
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           (opcode < opcode_end) && (buffer[0] == opcode->opcode[0]);
153
           opcode++)
154
        {
155
          const struct s390_operand *operand;
156
          const unsigned char *opindex;
157
 
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          /* Check architecture.  */
159
          if (!(opcode->modes & current_arch_mask))
160
            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.  */
170
          if (opcode->operands[0] != 0)
171
            (*info->fprintf_func) (info->stream, "%s\t", opcode->name);
172
          else
173
            (*info->fprintf_func) (info->stream, "%s", opcode->name);
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175
          /* Extract the operands.  */
176
          separator = 0;
177
          for (opindex = opcode->operands; *opindex != 0; opindex++)
178
            {
179
              unsigned int value;
180
 
181
              operand = s390_operands + *opindex;
182
              value = s390_extract_operand (buffer, operand);
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184
              if ((operand->flags & S390_OPERAND_INDEX) && value == 0)
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                continue;
186
              if ((operand->flags & S390_OPERAND_BASE) &&
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                  value == 0 && separator == '(')
188
                {
189
                  separator = ',';
190
                  continue;
191
                }
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193
              if (separator)
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                (*info->fprintf_func) (info->stream, "%c", separator);
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196
              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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211
              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 = ',';
222
            }
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224
          /* Found instruction, printed it, return its size.  */
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          return opsize;
226
        }
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      /* No matching instruction found, fall through to hex print.  */
228
    }
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230
  if (bufsize >= 4)
231
    {
232
      value = (unsigned int) buffer[0];
233
      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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    {
241
      value = (unsigned int) buffer[0];
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      value = (value << 8) + (unsigned int) buffer[1];
243
      (*info->fprintf_func) (info->stream, ".short\t0x%04x", value);
244
      return 2;
245
    }
246
  else
247
    {
248
      value = (unsigned int) buffer[0];
249
      (*info->fprintf_func) (info->stream, ".byte\t0x%02x", value);
250
      return 1;
251
    }
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}

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