binutils-gdb/opcodes/dis-buf.c

/* Disassemble from a buffer, for GNU.
   Copyright 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005,
   2007  Free Software Foundation, 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
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
   License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "dis-asm.h"
#include <errno.h>
#include "opintl.h"

/* Get LENGTH bytes from info's buffer, at target address memaddr.
   Transfer them to myaddr.  */
int
buffer_read_memory (bfd_vma memaddr,
		    bfd_byte *myaddr,
		    unsigned int length,
		    struct disassemble_info *info)
{
  unsigned int opb = info->octets_per_byte;
  unsigned int end_addr_offset = length / opb;
  unsigned int max_addr_offset = info->buffer_length / opb; 
  unsigned int octets = (memaddr - info->buffer_vma) * opb;

  if (memaddr < info->buffer_vma
      || memaddr - info->buffer_vma + end_addr_offset > max_addr_offset)
    /* Out of bounds.  Use EIO because GDB uses it.  */
    return EIO;
  memcpy (myaddr, info->buffer + octets, length);

  return 0;
}

/* Print an error message.  We can assume that this is in response to
   an error return from buffer_read_memory.  */

void
perror_memory (int status,
	       bfd_vma memaddr,
	       struct disassemble_info *info)
{
  if (status != EIO)
    /* Can't happen.  */
    info->fprintf_func (info->stream, _("Unknown error %d\n"), status);
  else
    {
      char buf[30];

      /* Actually, address between memaddr and memaddr + len was
	 out of bounds.  */
      sprintf_vma (buf, memaddr);
      info->fprintf_func (info->stream,
			  _("Address 0x%s is out of bounds.\n"), buf);
    }
}

/* This could be in a separate file, to save miniscule amounts of space
   in statically linked executables.  */

/* Just print the address is hex.  This is included for completeness even
   though both GDB and objdump provide their own (to print symbolic
   addresses).  */

void
generic_print_address (bfd_vma addr, struct disassemble_info *info)
{
  char buf[30];

  sprintf_vma (buf, addr);
  (*info->fprintf_func) (info->stream, "0x%s", buf);
}

/* Just return true.  */

int
generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
			   struct disassemble_info *info ATTRIBUTE_UNUSED)
{
  return 1;
}

/* Just return TRUE.  */

bfd_boolean
generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
			 struct disassemble_info *info ATTRIBUTE_UNUSED)
{
  return TRUE;
}