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1 | /* Disassemble from a buffer, for GNU. | |
2 | Copyright (C) 1993-2021 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 | |
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 | 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 | ||
54 | void | |
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 | |
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 | |
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 | |
102 | generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED, | |
103 | struct disassemble_info *info ATTRIBUTE_UNUSED) | |
104 | { | |
105 | return TRUE; | |
106 | } |