1/* Disassemble from a buffer, for GNU.
2   Copyright 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005,
3   2007  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 + 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
52void
53perror_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
79void
80generic_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
90int
91generic_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
99bfd_boolean
100generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
101			 struct disassemble_info *info ATTRIBUTE_UNUSED)
102{
103  return TRUE;
104}
105