1 /* Disassemble from a buffer, for GNU.
2 Copyright (C) 1993-2016 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. */
28 int
buffer_read_memory(bfd_vma memaddr,bfd_byte * myaddr,unsigned int length,struct disassemble_info * info)29 buffer_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 unsigned int end_addr_offset = length / opb;
36 unsigned int max_addr_offset = info->buffer_length / opb;
37 unsigned int 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
54 void
perror_memory(int status,bfd_vma memaddr,struct disassemble_info * info)55 perror_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 char buf[30];
65
66 /* Actually, address between memaddr and memaddr + len was
67 out of bounds. */
68 sprintf_vma (buf, memaddr);
69 info->fprintf_func (info->stream,
70 _("Address 0x%s is out of bounds.\n"), buf);
71 }
72 }
73
74 /* This could be in a separate file, to save miniscule amounts of space
75 in statically linked executables. */
76
77 /* Just print the address is hex. This is included for completeness even
78 though both GDB and objdump provide their own (to print symbolic
79 addresses). */
80
81 void
generic_print_address(bfd_vma addr,struct disassemble_info * info)82 generic_print_address (bfd_vma addr, struct disassemble_info *info)
83 {
84 char buf[30];
85
86 sprintf_vma (buf, addr);
87 (*info->fprintf_func) (info->stream, "0x%s", buf);
88 }
89
90 /* Just return true. */
91
92 int
generic_symbol_at_address(bfd_vma addr ATTRIBUTE_UNUSED,struct disassemble_info * info ATTRIBUTE_UNUSED)93 generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
94 struct disassemble_info *info ATTRIBUTE_UNUSED)
95 {
96 return 1;
97 }
98
99 /* Just return TRUE. */
100
101 bfd_boolean
generic_symbol_is_valid(asymbol * sym ATTRIBUTE_UNUSED,struct disassemble_info * info ATTRIBUTE_UNUSED)102 generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
103 struct disassemble_info *info ATTRIBUTE_UNUSED)
104 {
105 return TRUE;
106 }
107