debugger/opcodes/dis-buf.c

   1 /* Disassemble from a buffer, for GNU.
   2    Copyright (C) 1993, 1994 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 #include "dis-asm.h"
  19 #include "sysdep.h"
  20 #include <errno.h>
  21
  22 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  23    Transfer them to myaddr.  */
  24 int
  25 buffer_read_memory (memaddr, myaddr, length, info)
  26      bfd_vma memaddr;
  27      bfd_byte *myaddr;
  28      int length;
  29      struct disassemble_info *info;
  30 {
  31   if (memaddr < info->buffer_vma
  32       || memaddr + length > info->buffer_vma + info->buffer_length)
  33     /* Out of bounds.  Use EIO because GDB uses it.  */
  34     return EIO;
  35   memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
  36   return 0;
  37 }
  38
  39 /* Print an error message.  We can assume that this is in response to
  40    an error return from buffer_read_memory.  */
  41 void
  42 perror_memory (status, memaddr, info)
  43      int status;
  44      bfd_vma memaddr;
  45      struct disassemble_info *info;
  46 {
  47   if (status != EIO)
  48     /* Can't happen.  */
  49     (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
  50   else
  51     /* Actually, address between memaddr and memaddr + len was
  52        out of bounds.  */
  53     (*info->fprintf_func) (info->stream,
  54                            "Address 0x%x is out of bounds.\n", memaddr);
  55 }
  56
  57 /* This could be in a separate file, to save miniscule amounts of space
  58    in statically linked executables.  */
  59
  60 /* Just print the address is hex.  This is included for completeness even
  61    though both GDB and objdump provide their own (to print symbolic
  62    addresses).  */
  63
  64 void
  65 generic_print_address (addr, info)
  66      bfd_vma addr;
  67      struct disassemble_info *info;
  68 {
  69   (*info->fprintf_func) (info->stream, "0x%x", addr);
  70 }