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cell-binutils  2.17cvs20070401
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xtensa-dis.c File Reference
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include "xtensa-isa.h"
#include "ansidecl.h"
#include "libiberty.h"
#include "sysdep.h"
#include "dis-asm.h"
#include <setjmp.h>

Go to the source code of this file.


struct  dis_private


#define MAX(a, b)   (a > b ? a : b)


static int fetch_data (struct disassemble_info *info, bfd_vma memaddr)
static void print_xtensa_operand (bfd_vma memaddr, struct disassemble_info *info, xtensa_opcode opc, int opnd, unsigned operand_val)
int print_insn_xtensa (bfd_vma memaddr, struct disassemble_info *info)


xtensa_isa xtensa_default_isa
int show_raw_fields

Class Documentation

struct dis_private

Definition at line 102 of file i386-dis.c.

Class Members
jmp_buf bailout
bfd_byte * byte_buf
bfd_vma insn_start
bfd_byte * max_fetched
int orig_sizeflag
bfd_byte the_buffer

Define Documentation

#define MAX (   a,
)    (a > b ? a : b)

Definition at line 37 of file xtensa-dis.c.

Function Documentation

static int fetch_data ( struct disassemble_info info,
bfd_vma  memaddr 
) [static]

Definition at line 50 of file xtensa-dis.c.

  int length, status = 0;
  struct dis_private *priv = (struct dis_private *) info->private_data;
  int insn_size = xtensa_isa_maxlength (xtensa_default_isa);

  /* Read the maximum instruction size, padding with zeros if we go past
     the end of the text section.  This code will automatically adjust
     length when we hit the end of the buffer.  */

  memset (priv->byte_buf, 0, insn_size);
  for (length = insn_size; length > 0; length--)
      status = (*info->read_memory_func) (memaddr, priv->byte_buf, length,
      if (status == 0)
       return length;
  (*info->memory_error_func) (status, memaddr, info);
  longjmp (priv->bailout, 1);

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Definition at line 136 of file xtensa-dis.c.

  unsigned operand_val;
  int bytes_fetched, size, maxsize, i, n, noperands, nslots;
  xtensa_isa isa;
  xtensa_opcode opc;
  xtensa_format fmt;
  struct dis_private priv;
  static bfd_byte *byte_buf = NULL;
  static xtensa_insnbuf insn_buffer = NULL;
  static xtensa_insnbuf slot_buffer = NULL;
  int first, first_slot, valid_insn;

  if (!xtensa_default_isa)
    xtensa_default_isa = xtensa_isa_init (0, 0);

  info->target = 0;
  maxsize = xtensa_isa_maxlength (xtensa_default_isa);

  /* Set bytes_per_line to control the amount of whitespace between the hex
     values and the opcode.  For Xtensa, we always print one "chunk" and we
     vary bytes_per_chunk to determine how many bytes to print.  (objdump
     would apparently prefer that we set bytes_per_chunk to 1 and vary
     bytes_per_line but that makes it hard to fit 64-bit instructions on
     an 80-column screen.)  The value of bytes_per_line here is not exactly
     right, because objdump adds an extra space for each chunk so that the
     amount of whitespace depends on the chunk size.  Oh well, it's good
     enough....  Note that we set the minimum size to 4 to accomodate
     literal pools.  */
  info->bytes_per_line = MAX (maxsize, 4);

  /* Allocate buffers the first time through.  */
  if (!insn_buffer)
      insn_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
      slot_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
      byte_buf = (bfd_byte *) xmalloc (MAX (maxsize, 4));

  priv.byte_buf = byte_buf;

  info->private_data = (void *) &priv;
  if (setjmp (priv.bailout) != 0)
      /* Error return.  */
      return -1;

  /* Don't set "isa" before the setjmp to keep the compiler from griping.  */
  isa = xtensa_default_isa;
  size = 0;
  nslots = 0;

  /* Fetch the maximum size instruction.  */
  bytes_fetched = fetch_data (info, memaddr);

  /* Copy the bytes into the decode buffer.  */
  memset (insn_buffer, 0, (xtensa_insnbuf_size (isa) *
                        sizeof (xtensa_insnbuf_word)));
  xtensa_insnbuf_from_chars (isa, insn_buffer, priv.byte_buf, bytes_fetched);

  fmt = xtensa_format_decode (isa, insn_buffer);
      || ((size = xtensa_format_length (isa, fmt)) > bytes_fetched))
    valid_insn = 0;
      /* Make sure all the opcodes are valid.  */
      valid_insn = 1;
      nslots = xtensa_format_num_slots (isa, fmt);
      for (n = 0; n < nslots; n++)
         xtensa_format_get_slot (isa, fmt, n, insn_buffer, slot_buffer);
         if (xtensa_opcode_decode (isa, fmt, n, slot_buffer)
             == XTENSA_UNDEFINED)
             valid_insn = 0;

  if (!valid_insn)
      (*info->fprintf_func) (info->stream, ".byte %#02x", priv.byte_buf[0]);
      return 1;

  if (nslots > 1)
    (*info->fprintf_func) (info->stream, "{ ");

  first_slot = 1;
  for (n = 0; n < nslots; n++)
      if (first_slot)
       first_slot = 0;
       (*info->fprintf_func) (info->stream, "; ");

      xtensa_format_get_slot (isa, fmt, n, insn_buffer, slot_buffer);
      opc = xtensa_opcode_decode (isa, fmt, n, slot_buffer);
      (*info->fprintf_func) (info->stream, "%s",
                          xtensa_opcode_name (isa, opc));

      /* Print the operands (if any).  */
      noperands = xtensa_opcode_num_operands (isa, opc);
      first = 1;
      for (i = 0; i < noperands; i++)
         if (xtensa_operand_is_visible (isa, opc, i) == 0)
         if (first)
             (*info->fprintf_func) (info->stream, "\t");
             first = 0;
           (*info->fprintf_func) (info->stream, ", ");
         (void) xtensa_operand_get_field (isa, opc, i, fmt, n,
                                      slot_buffer, &operand_val);

         print_xtensa_operand (memaddr, info, opc, i, operand_val);

  if (nslots > 1)
    (*info->fprintf_func) (info->stream, " }");

  info->bytes_per_chunk = size;
  info->display_endian = info->endian;

  return size;

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static void print_xtensa_operand ( bfd_vma  memaddr,
struct disassemble_info info,
xtensa_opcode  opc,
int  opnd,
unsigned  operand_val 
) [static]

Definition at line 75 of file xtensa-dis.c.

  xtensa_isa isa = xtensa_default_isa;
  int signed_operand_val;
  if (show_raw_fields)
      if (operand_val < 0xa)
       (*info->fprintf_func) (info->stream, "%u", operand_val);
       (*info->fprintf_func) (info->stream, "0x%x", operand_val);

  (void) xtensa_operand_decode (isa, opc, opnd, &operand_val);
  signed_operand_val = (int) operand_val;

  if (xtensa_operand_is_register (isa, opc, opnd) == 0)
      if (xtensa_operand_is_PCrelative (isa, opc, opnd) == 1)
         (void) xtensa_operand_undo_reloc (isa, opc, opnd,
                                       &operand_val, memaddr);
         info->target = operand_val;
         (*info->print_address_func) (info->target, info);
         if ((signed_operand_val > -256) && (signed_operand_val < 256))
           (*info->fprintf_func) (info->stream, "%d", signed_operand_val);
           (*info->fprintf_func) (info->stream, "0x%x", signed_operand_val);
      int i = 1;
      xtensa_regfile opnd_rf = xtensa_operand_regfile (isa, opc, opnd);
      (*info->fprintf_func) (info->stream, "%s%u",
                          xtensa_regfile_shortname (isa, opnd_rf),
      while (i < xtensa_operand_num_regs (isa, opc, opnd))
         (*info->fprintf_func) (info->stream, ":%s%u",
                             xtensa_regfile_shortname (isa, opnd_rf),

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Variable Documentation

Definition at line 40 of file xtensa-dis.c.