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[/] [openrisc/] [trunk/] [gnu-stable/] [binutils-2.20.1/] [opcodes/] [xtensa-dis.c] - Blame information for rev 818

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/* xtensa-dis.c.  Disassembly functions for Xtensa.
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   Copyright 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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   Contributed by Bob Wilson at Tensilica, Inc. (bwilson@tensilica.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 <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <string.h>
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#include "xtensa-isa.h"
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#include "ansidecl.h"
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#include "libiberty.h"
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#include "sysdep.h"
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#include "dis-asm.h"
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#include <setjmp.h>
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extern xtensa_isa xtensa_default_isa;
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#ifndef MAX
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#define MAX(a,b) (a > b ? a : b)
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#endif
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int show_raw_fields;
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struct dis_private
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{
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  bfd_byte *byte_buf;
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  jmp_buf bailout;
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};
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static int
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fetch_data (struct disassemble_info *info, bfd_vma memaddr)
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{
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  int length, status = 0;
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  struct dis_private *priv = (struct dis_private *) info->private_data;
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  int insn_size = xtensa_isa_maxlength (xtensa_default_isa);
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  /* Read the maximum instruction size, padding with zeros if we go past
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     the end of the text section.  This code will automatically adjust
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     length when we hit the end of the buffer.  */
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  memset (priv->byte_buf, 0, insn_size);
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  for (length = insn_size; length > 0; length--)
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    {
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      status = (*info->read_memory_func) (memaddr, priv->byte_buf, length,
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                                          info);
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      if (status == 0)
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        return length;
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    }
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  (*info->memory_error_func) (status, memaddr, info);
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  longjmp (priv->bailout, 1);
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  /*NOTREACHED*/
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}
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static void
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print_xtensa_operand (bfd_vma memaddr,
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                      struct disassemble_info *info,
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                      xtensa_opcode opc,
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                      int opnd,
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                      unsigned operand_val)
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{
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  xtensa_isa isa = xtensa_default_isa;
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  int signed_operand_val;
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  if (show_raw_fields)
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    {
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      if (operand_val < 0xa)
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        (*info->fprintf_func) (info->stream, "%u", operand_val);
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      else
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        (*info->fprintf_func) (info->stream, "0x%x", operand_val);
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      return;
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    }
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  (void) xtensa_operand_decode (isa, opc, opnd, &operand_val);
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  signed_operand_val = (int) operand_val;
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  if (xtensa_operand_is_register (isa, opc, opnd) == 0)
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    {
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      if (xtensa_operand_is_PCrelative (isa, opc, opnd) == 1)
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        {
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          (void) xtensa_operand_undo_reloc (isa, opc, opnd,
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                                            &operand_val, memaddr);
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          info->target = operand_val;
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          (*info->print_address_func) (info->target, info);
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        }
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      else
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        {
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          if ((signed_operand_val > -256) && (signed_operand_val < 256))
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            (*info->fprintf_func) (info->stream, "%d", signed_operand_val);
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          else
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            (*info->fprintf_func) (info->stream, "0x%x", signed_operand_val);
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        }
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    }
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  else
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    {
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      int i = 1;
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      xtensa_regfile opnd_rf = xtensa_operand_regfile (isa, opc, opnd);
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      (*info->fprintf_func) (info->stream, "%s%u",
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                             xtensa_regfile_shortname (isa, opnd_rf),
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                             operand_val);
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      while (i < xtensa_operand_num_regs (isa, opc, opnd))
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        {
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          operand_val++;
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          (*info->fprintf_func) (info->stream, ":%s%u",
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                                 xtensa_regfile_shortname (isa, opnd_rf),
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                                 operand_val);
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          i++;
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        }
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    }
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}
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/* Print the Xtensa instruction at address MEMADDR on info->stream.
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   Returns length of the instruction in bytes.  */
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int
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print_insn_xtensa (bfd_vma memaddr, struct disassemble_info *info)
137
{
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  unsigned operand_val;
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  int bytes_fetched, size, maxsize, i, n, noperands, nslots;
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  xtensa_isa isa;
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  xtensa_opcode opc;
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  xtensa_format fmt;
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  struct dis_private priv;
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  static bfd_byte *byte_buf = NULL;
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  static xtensa_insnbuf insn_buffer = NULL;
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  static xtensa_insnbuf slot_buffer = NULL;
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  int first, first_slot, valid_insn;
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  if (!xtensa_default_isa)
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    xtensa_default_isa = xtensa_isa_init (0, 0);
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  info->target = 0;
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  maxsize = xtensa_isa_maxlength (xtensa_default_isa);
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  /* Set bytes_per_line to control the amount of whitespace between the hex
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     values and the opcode.  For Xtensa, we always print one "chunk" and we
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     vary bytes_per_chunk to determine how many bytes to print.  (objdump
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     would apparently prefer that we set bytes_per_chunk to 1 and vary
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     bytes_per_line but that makes it hard to fit 64-bit instructions on
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     an 80-column screen.)  The value of bytes_per_line here is not exactly
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     right, because objdump adds an extra space for each chunk so that the
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     amount of whitespace depends on the chunk size.  Oh well, it's good
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     enough....  Note that we set the minimum size to 4 to accomodate
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     literal pools.  */
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  info->bytes_per_line = MAX (maxsize, 4);
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  /* Allocate buffers the first time through.  */
168
  if (!insn_buffer)
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    {
170
      insn_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
171
      slot_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
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      byte_buf = (bfd_byte *) xmalloc (MAX (maxsize, 4));
173
    }
174
 
175
  priv.byte_buf = byte_buf;
176
 
177
  info->private_data = (void *) &priv;
178
  if (setjmp (priv.bailout) != 0)
179
      /* Error return.  */
180
      return -1;
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  /* Don't set "isa" before the setjmp to keep the compiler from griping.  */
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  isa = xtensa_default_isa;
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  size = 0;
185
  nslots = 0;
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  /* Fetch the maximum size instruction.  */
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  bytes_fetched = fetch_data (info, memaddr);
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  /* Copy the bytes into the decode buffer.  */
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  memset (insn_buffer, 0, (xtensa_insnbuf_size (isa) *
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                           sizeof (xtensa_insnbuf_word)));
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  xtensa_insnbuf_from_chars (isa, insn_buffer, priv.byte_buf, bytes_fetched);
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195
  fmt = xtensa_format_decode (isa, insn_buffer);
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  if (fmt == XTENSA_UNDEFINED
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      || ((size = xtensa_format_length (isa, fmt)) > bytes_fetched))
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    valid_insn = 0;
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  else
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    {
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      /* Make sure all the opcodes are valid.  */
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      valid_insn = 1;
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      nslots = xtensa_format_num_slots (isa, fmt);
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      for (n = 0; n < nslots; n++)
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        {
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          xtensa_format_get_slot (isa, fmt, n, insn_buffer, slot_buffer);
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          if (xtensa_opcode_decode (isa, fmt, n, slot_buffer)
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              == XTENSA_UNDEFINED)
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            {
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              valid_insn = 0;
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              break;
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            }
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        }
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    }
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  if (!valid_insn)
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    {
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      (*info->fprintf_func) (info->stream, ".byte %#02x", priv.byte_buf[0]);
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      return 1;
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    }
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222
  if (nslots > 1)
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    (*info->fprintf_func) (info->stream, "{ ");
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225
  first_slot = 1;
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  for (n = 0; n < nslots; n++)
227
    {
228
      if (first_slot)
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        first_slot = 0;
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      else
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        (*info->fprintf_func) (info->stream, "; ");
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233
      xtensa_format_get_slot (isa, fmt, n, insn_buffer, slot_buffer);
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      opc = xtensa_opcode_decode (isa, fmt, n, slot_buffer);
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      (*info->fprintf_func) (info->stream, "%s",
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                             xtensa_opcode_name (isa, opc));
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      /* Print the operands (if any).  */
239
      noperands = xtensa_opcode_num_operands (isa, opc);
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      first = 1;
241
      for (i = 0; i < noperands; i++)
242
        {
243
          if (xtensa_operand_is_visible (isa, opc, i) == 0)
244
            continue;
245
          if (first)
246
            {
247
              (*info->fprintf_func) (info->stream, "\t");
248
              first = 0;
249
            }
250
          else
251
            (*info->fprintf_func) (info->stream, ", ");
252
          (void) xtensa_operand_get_field (isa, opc, i, fmt, n,
253
                                           slot_buffer, &operand_val);
254
 
255
          print_xtensa_operand (memaddr, info, opc, i, operand_val);
256
        }
257
    }
258
 
259
  if (nslots > 1)
260
    (*info->fprintf_func) (info->stream, " }");
261
 
262
  info->bytes_per_chunk = size;
263
  info->display_endian = info->endian;
264
 
265
  return size;
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}
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