dis-buf.c revision 1.1 
1/* Disassemble from a buffer, for GNU.
2   Copyright 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005,
3   2007, 2009, 2010  Free Software Foundation, Inc.
4
5   This file is part of the GNU opcodes library.
6
7   This library is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3, or (at your option)
10   any later version.
11
12   It is distributed in the hope that it will be useful, but WITHOUT
13   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
15   License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20   MA 02110-1301, USA.  */
21
22#include "sysdep.h"
23#include "dis-asm.h"
24#include <errno.h>
25#include "opintl.h"
26
27/* Get LENGTH bytes from info's buffer, at target address memaddr.
28   Transfer them to myaddr.  */
29int
30buffer_read_memory (bfd_vma memaddr,
31		    bfd_byte *myaddr,
32		    unsigned int length,
33		    struct disassemble_info *info)
34{
35  unsigned int opb = info->octets_per_byte;
36  unsigned int end_addr_offset = length / opb;
37  unsigned int max_addr_offset = info->buffer_length / opb;
38  unsigned int octets = (memaddr - info->buffer_vma) * opb;
39
40  if (memaddr < info->buffer_vma
41      || memaddr - info->buffer_vma > max_addr_offset
42      || memaddr - info->buffer_vma + end_addr_offset > max_addr_offset)
43    /* Out of bounds.  Use EIO because GDB uses it.  */
44    return EIO;
45  memcpy (myaddr, info->buffer + octets, length);
46
47  return 0;
48}
49
50/* Print an error message.  We can assume that this is in response to
51   an error return from buffer_read_memory.  */
52
53void
54perror_memory (int status,
55	       bfd_vma memaddr,
56	       struct disassemble_info *info)
57{
58  if (status != EIO)
59    /* Can't happen.  */
60    info->fprintf_func (info->stream, _("Unknown error %d\n"), status);
61  else
62    {
63      char buf[30];
64
65      /* Actually, address between memaddr and memaddr + len was
66	 out of bounds.  */
67      sprintf_vma (buf, memaddr);
68      info->fprintf_func (info->stream,
69			  _("Address 0x%s is out of bounds.\n"), buf);
70    }
71}
72
73/* This could be in a separate file, to save miniscule amounts of space
74   in statically linked executables.  */
75
76/* Just print the address is hex.  This is included for completeness even
77   though both GDB and objdump provide their own (to print symbolic
78   addresses).  */
79
80void
81generic_print_address (bfd_vma addr, struct disassemble_info *info)
82{
83  char buf[30];
84
85  sprintf_vma (buf, addr);
86  (*info->fprintf_func) (info->stream, "0x%s", buf);
87}
88
89/* Just return true.  */
90
91int
92generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
93			   struct disassemble_info *info ATTRIBUTE_UNUSED)
94{
95  return 1;
96}
97
98/* Just return TRUE.  */
99
100bfd_boolean
101generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
102			 struct disassemble_info *info ATTRIBUTE_UNUSED)
103{
104  return TRUE;
105}
106