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/* xtensa-dis.c. Disassembly functions for Xtensa.
Copyright 2003, 2004, 2005, 2007, 2012 Free Software Foundation, Inc.
Contributed by Bob Wilson at Tensilica, Inc. (
This file is part of the GNU opcodes library.
This library 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 3, or (at your option)
any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
License for more details.
You should have received a copy of the GNU General Public License
along with this file; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include "xtensa-isa.h"
#include "ansidecl.h"
#include "libiberty.h"
#include "dis-asm.h"
#include <setjmp.h>
extern xtensa_isa xtensa_default_isa;
#ifndef MAX
#define MAX(a,b) (a > b ? a : b)
int show_raw_fields;
struct dis_private
bfd_byte *byte_buf;
jmp_buf bailout;
static int
fetch_data (struct disassemble_info *info, bfd_vma memaddr)
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);
static void
print_xtensa_operand (bfd_vma memaddr,
struct disassemble_info *info,
xtensa_opcode opc,
int opnd,
unsigned operand_val)
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),
/* Print the Xtensa instruction at address MEMADDR on info->stream.
Returns length of the instruction in bytes. */
print_insn_xtensa (bfd_vma memaddr, struct disassemble_info *info)
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)
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;