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dis-buf.c revision 1.1.1.1 
      1 /* Disassemble from a buffer, for GNU.
      2    Copyright 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005,
      3    2007, 2009, 2010  Free Software Foundation, Inc.
      4 
      5    This file is part of the GNU opcodes library.
      6 
      7    This library is free software; you can redistribute it and/or modify
      8    it under the terms of the GNU General Public License as published by
      9    the Free Software Foundation; either version 3, or (at your option)
     10    any later version.
     11 
     12    It is distributed in the hope that it will be useful, but WITHOUT
     13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
     15    License for more details.
     16 
     17    You should have received a copy of the GNU General Public License
     18    along with this program; if not, write to the Free Software
     19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
     20    MA 02110-1301, USA.  */
     21 
     22 #include "sysdep.h"
     23 #include "dis-asm.h"
     24 #include <errno.h>
     25 #include "opintl.h"
     26 
     27 /* Get LENGTH bytes from info's buffer, at target address memaddr.
     28    Transfer them to myaddr.  */
     29 int
     30 buffer_read_memory (bfd_vma memaddr,
     31 		    bfd_byte *myaddr,
     32 		    unsigned int length,
     33 		    struct disassemble_info *info)
     34 {
     35   unsigned int opb = info->octets_per_byte;
     36   unsigned int end_addr_offset = length / opb;
     37   unsigned int max_addr_offset = info->buffer_length / opb;
     38   unsigned int octets = (memaddr - info->buffer_vma) * opb;
     39 
     40   if (memaddr < info->buffer_vma
     41       || memaddr - info->buffer_vma > max_addr_offset
     42       || memaddr - info->buffer_vma + end_addr_offset > max_addr_offset)
     43     /* Out of bounds.  Use EIO because GDB uses it.  */
     44     return EIO;
     45   memcpy (myaddr, info->buffer + octets, length);
     46 
     47   return 0;
     48 }
     49 
     50 /* Print an error message.  We can assume that this is in response to
     51    an error return from buffer_read_memory.  */
     52 
     53 void
     54 perror_memory (int status,
     55 	       bfd_vma memaddr,
     56 	       struct disassemble_info *info)
     57 {
     58   if (status != EIO)
     59     /* Can't happen.  */
     60     info->fprintf_func (info->stream, _("Unknown error %d\n"), status);
     61   else
     62     {
     63       char buf[30];
     64 
     65       /* Actually, address between memaddr and memaddr + len was
     66 	 out of bounds.  */
     67       sprintf_vma (buf, memaddr);
     68       info->fprintf_func (info->stream,
     69 			  _("Address 0x%s is out of bounds.\n"), buf);
     70     }
     71 }
     72 
     73 /* This could be in a separate file, to save miniscule amounts of space
     74    in statically linked executables.  */
     75 
     76 /* Just print the address is hex.  This is included for completeness even
     77    though both GDB and objdump provide their own (to print symbolic
     78    addresses).  */
     79 
     80 void
     81 generic_print_address (bfd_vma addr, struct disassemble_info *info)
     82 {
     83   char buf[30];
     84 
     85   sprintf_vma (buf, addr);
     86   (*info->fprintf_func) (info->stream, "0x%s", buf);
     87 }
     88 
     89 /* Just return true.  */
     90 
     91 int
     92 generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
     93 			   struct disassemble_info *info ATTRIBUTE_UNUSED)
     94 {
     95   return 1;
     96 }
     97 
     98 /* Just return TRUE.  */
     99 
    100 bfd_boolean
    101 generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
    102 			 struct disassemble_info *info ATTRIBUTE_UNUSED)
    103 {
    104   return TRUE;
    105 }
    106