opcodes/dis-buf.c

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