1/* Disassemble from a buffer, for GNU.
2   Copyright (C) 1993-2022 Free Software Foundation, Inc.
3
4   This file is part of the GNU opcodes library.
5
6   This library is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3, or (at your option)
9   any later version.
10
11   It is distributed in the hope that it will be useful, but WITHOUT
12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
14   License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software
18   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19   MA 02110-1301, USA.  */
20
21#include "sysdep.h"
22#include "dis-asm.h"
23#include <errno.h>
24#include "opintl.h"
25
26/* Get LENGTH bytes from info's buffer, at target address memaddr.
27   Transfer them to myaddr.  */
28int
29buffer_read_memory (bfd_vma memaddr,
30		    bfd_byte *myaddr,
31		    unsigned int length,
32		    struct disassemble_info *info)
33{
34  unsigned int opb = info->octets_per_byte;
35  size_t end_addr_offset = length / opb;
36  size_t max_addr_offset = info->buffer_length / opb;
37  size_t octets = (memaddr - info->buffer_vma) * opb;
38
39  if (memaddr < info->buffer_vma
40      || memaddr - info->buffer_vma > max_addr_offset
41      || memaddr - info->buffer_vma + end_addr_offset > max_addr_offset
42      || (info->stop_vma && (memaddr >= info->stop_vma
43			     || memaddr + end_addr_offset > info->stop_vma)))
44    /* Out of bounds.  Use EIO because GDB uses it.  */
45    return EIO;
46  memcpy (myaddr, info->buffer + octets, length);
47
48  return 0;
49}
50
51/* Print an error message.  We can assume that this is in response to
52   an error return from buffer_read_memory.  */
53
54void
55perror_memory (int status,
56	       bfd_vma memaddr,
57	       struct disassemble_info *info)
58{
59  if (status != EIO)
60    /* Can't happen.  */
61    info->fprintf_func (info->stream, _("Unknown error %d\n"), status);
62  else
63    {
64      /* Actually, address between memaddr and memaddr + len was
65	 out of bounds.  */
66      info->fprintf_func (info->stream,
67			  _("Address 0x%" PRIx64 " is out of bounds.\n"),
68			  (uint64_t) memaddr);
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  (*info->fprintf_func) (info->stream, "0x%08" PRIx64, (uint64_t) addr);
83}
84
85/* Just return NULL.  */
86
87asymbol *
88generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
89			   struct disassemble_info *info ATTRIBUTE_UNUSED)
90{
91  return NULL;
92}
93
94/* Just return TRUE.  */
95
96bool
97generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
98			 struct disassemble_info *info ATTRIBUTE_UNUSED)
99{
100  return true;
101}
102