opcodes/dis-buf.c

   1 /* Disassemble from a buffer, for GNU.
   2    Copyright (C) 1993-2015 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU opcodes library.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    It is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "dis-asm.h"
  23 #include <errno.h>
  24 #include "opintl.h"
  25
  26 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  27    Transfer them to myaddr.  */
  28 int
  29 buffer_read_memory (bfd_vma memaddr,
  30                     bfd_byte *myaddr,
  31                     unsigned int length,
  32                     struct disassemble_info *info)
  33 {
  34   unsigned int opb = info->octets_per_byte;
  35   unsigned int end_addr_offset = length / opb;
  36   unsigned int max_addr_offset = info->buffer_length / opb;
  37   unsigned int octets = (memaddr - info->buffer_vma) * opb;
  38
  39   if (memaddr < info->buffer_vma
  40       || memaddr - info->buffer_vma > max_addr_offset
  41       || memaddr - info->buffer_vma + end_addr_offset > max_addr_offset)
  42     /* Out of bounds.  Use EIO because GDB uses it.  */
  43     return EIO;
  44   memcpy (myaddr, info->buffer + octets, length);
  45
  46   return 0;
  47 }
  48
  49 /* Print an error message.  We can assume that this is in response to
  50    an error return from buffer_read_memory.  */
  51
  52 void
  53 perror_memory (int status,
  54                bfd_vma memaddr,
  55                struct disassemble_info *info)
  56 {
  57   if (status != EIO)
  58     /* Can't happen.  */
  59     info->fprintf_func (info->stream, _("Unknown error %d\n"), status);
  60   else
  61     {
  62       char buf[30];
  63
  64       /* Actually, address between memaddr and memaddr + len was
  65          out of bounds.  */
  66       sprintf_vma (buf, memaddr);
  67       info->fprintf_func (info->stream,
  68                           _("Address 0x%s is out of bounds.\n"), buf);
  69     }
  70 }
  71
  72 /* This could be in a separate file, to save miniscule amounts of space
  73    in statically linked executables.  */
  74
  75 /* Just print the address is hex.  This is included for completeness even
  76    though both GDB and objdump provide their own (to print symbolic
  77    addresses).  */
  78
  79 void
  80 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  81 {
  82   char buf[30];
  83
  84   sprintf_vma (buf, addr);
  85   (*info->fprintf_func) (info->stream, "0x%s", buf);
  86 }
  87
  88 /* Just return true.  */
  89
  90 int
  91 generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
  92                            struct disassemble_info *info ATTRIBUTE_UNUSED)
  93 {
  94   return 1;
  95 }
  96
  97 /* Just return TRUE.  */
  98
  99 bfd_boolean
 100 generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
 101                          struct disassemble_info *info ATTRIBUTE_UNUSED)
 102 {
 103   return TRUE;
 104 }