268 lines
7.6 KiB
C
268 lines
7.6 KiB
C
/* xtensa-dis.c. Disassembly functions for Xtensa.
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Copyright 2003, 2004, 2005, 2007, 2012 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 "sysdep.h"
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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 "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)
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{
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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. */
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if (!insn_buffer)
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{
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insn_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
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slot_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
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byte_buf = (bfd_byte *) xmalloc (MAX (maxsize, 4));
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}
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priv.byte_buf = byte_buf;
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info->private_data = (void *) &priv;
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if (setjmp (priv.bailout) != 0)
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/* Error return. */
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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;
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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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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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if (nslots > 1)
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(*info->fprintf_func) (info->stream, "{ ");
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first_slot = 1;
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for (n = 0; n < nslots; n++)
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{
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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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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). */
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noperands = xtensa_opcode_num_operands (isa, opc);
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first = 1;
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for (i = 0; i < noperands; i++)
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{
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if (xtensa_operand_is_visible (isa, opc, i) == 0)
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continue;
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if (first)
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{
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(*info->fprintf_func) (info->stream, "\t");
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first = 0;
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}
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else
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(*info->fprintf_func) (info->stream, ", ");
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(void) xtensa_operand_get_field (isa, opc, i, fmt, n,
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slot_buffer, &operand_val);
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print_xtensa_operand (memaddr, info, opc, i, operand_val);
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}
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}
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if (nslots > 1)
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(*info->fprintf_func) (info->stream, " }");
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info->bytes_per_chunk = size;
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info->display_endian = info->endian;
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return size;
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}
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