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 #if 0
  84 /* Just concatenate the address as hex.  This is included for
  85    completeness even though both GDB and objdump provide their own (to
  86    print symbolic addresses).  */
  87
  88 void generic_strcat_address PARAMS ((bfd_vma, char *, int));
  89
  90 void
  91 generic_strcat_address (addr, buf, len)
  92      bfd_vma addr;
  93      char *buf;
  94      int len;
  95 {
  96   if (buf != (char *)NULL && len > 0)
  97     {
  98       char tmpBuf[30];
  99
 100       sprintf_vma (tmpBuf, addr);
 101       if ((strlen (buf) + strlen (tmpBuf)) <= (unsigned int) len)
 102         strcat (buf, tmpBuf);
 103       else
 104         strncat (buf, tmpBuf, (len - strlen(buf)));
 105     }
 106   return;
 107 }
 108 #endif
 109
 110 /* Just return true.  */
 111
 112 int
 113 generic_symbol_at_address (addr, info)
 114      bfd_vma addr ATTRIBUTE_UNUSED;
 115      struct disassemble_info *info ATTRIBUTE_UNUSED;
 116 {
 117   return 1;
 118 }
 119
 120 /* Just return TRUE.  */
 121
 122 bfd_boolean
 123 generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
 124                          struct disassemble_info *info ATTRIBUTE_UNUSED)
 125 {
 126   return TRUE;
 127 }