opcodes/dis-buf.c

   1 /* Disassemble from a buffer, for GNU.
   2    Copyright 1993, 1994, 1996, 1997, 1998, 1999, 2000
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #include "sysdep.h"
  20 #include "dis-asm.h"
  21 #include <errno.h>
  22 #include "opintl.h"
  23
  24 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  25    Transfer them to myaddr.  */
  26 int
  27 buffer_read_memory (memaddr, myaddr, length, info)
  28      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 void
  50 perror_memory (status, memaddr, info)
  51      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     /* Actually, address between memaddr and memaddr + len was
  60        out of bounds.  */
  61     info->fprintf_func (info->stream,
  62                         _("Address 0x%x is out of bounds.\n"), memaddr);
  63 }
  64
  65 /* This could be in a separate file, to save miniscule amounts of space
  66    in statically linked executables.  */
  67
  68 /* Just print the address is hex.  This is included for completeness even
  69    though both GDB and objdump provide their own (to print symbolic
  70    addresses).  */
  71
  72 void
  73 generic_print_address (addr, info)
  74      bfd_vma addr;
  75      struct disassemble_info *info;
  76 {
  77   char buf[30];
  78
  79   sprintf_vma (buf, addr);
  80   (*info->fprintf_func) (info->stream, "0x%s", buf);
  81 }
  82
  83 /* Just concatenate the address as hex.  This is included for
  84    completeness even though both GDB and objdump provide their own (to
  85    print symbolic addresses).  */
  86
  87 void
  88 generic_strcat_address (addr, buf, len)
  89      bfd_vma addr;
  90      char *buf;
  91      int len;
  92 {
  93   if (buf != (char *)NULL && len > 0)
  94     {
  95       char tmpBuf[30];
  96
  97       sprintf_vma (tmpBuf, addr);
  98       if ((strlen (buf) + strlen (tmpBuf)) <= (unsigned int) len)
  99         strcat (buf, tmpBuf);
 100       else
 101         strncat (buf, tmpBuf, (len - strlen(buf)));
 102     }
 103   return;
 104 }
 105
 106 /* Just return the given address.  */
 107
 108 int
 109 generic_symbol_at_address (addr, info)
 110      bfd_vma addr ATTRIBUTE_UNUSED;
 111      struct disassemble_info *info ATTRIBUTE_UNUSED;
 112 {
 113   return 1;
 114 }