1 /*-
2 * Copyright (c) 2006 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <libelf.h>
31 #include <string.h>
32
33 #include "_libelf.h"
34
35 /*
36 * Retrieve a human readable translation for an error message.
37 */
38
39 static const char *_libelf_errors[] = {
40 #define DEFINE_ERROR(N,S) [ELF_E_##N] = S
41 DEFINE_ERROR(NONE, "No Error"),
42 DEFINE_ERROR(ARCHIVE, "Malformed ar(1) archive"),
43 DEFINE_ERROR(ARGUMENT, "Invalid argument"),
44 DEFINE_ERROR(CLASS, "ELF class mismatch"),
45 DEFINE_ERROR(DATA, "Invalid data buffer descriptor"),
46 DEFINE_ERROR(HEADER, "Missing or malformed ELF header"),
47 DEFINE_ERROR(IO, "I/O error"),
48 DEFINE_ERROR(LAYOUT, "Layout constraint violation"),
49 DEFINE_ERROR(MODE, "Incorrect ELF descriptor mode"),
50 DEFINE_ERROR(RANGE, "Value out of range of target"),
51 DEFINE_ERROR(RESOURCE, "Resource exhaustion"),
52 DEFINE_ERROR(SECTION, "Invalid section descriptor"),
53 DEFINE_ERROR(SEQUENCE, "API calls out of sequence"),
54 DEFINE_ERROR(UNIMPL, "Unimplemented feature"),
55 DEFINE_ERROR(VERSION, "Unknown ELF API version"),
56 DEFINE_ERROR(NUM, "Unknown error")
57 #undef DEFINE_ERROR
58 };
59
60 const char *
elf_errmsg(int error)61 elf_errmsg(int error)
62 {
63 int oserr;
64
65 if (error == 0 && (error = LIBELF_PRIVATE(error)) == 0)
66 return NULL;
67 else if (error == -1)
68 error = LIBELF_PRIVATE(error);
69
70 oserr = error >> LIBELF_OS_ERROR_SHIFT;
71 error &= LIBELF_ELF_ERROR_MASK;
72
73 if (error < 0 || error >= ELF_E_NUM)
74 return _libelf_errors[ELF_E_NUM];
75 if (oserr) {
76 strlcpy(LIBELF_PRIVATE(msg), _libelf_errors[error],
77 sizeof(LIBELF_PRIVATE(msg)));
78 strlcat(LIBELF_PRIVATE(msg), ": ", sizeof(LIBELF_PRIVATE(msg)));
79 strlcat(LIBELF_PRIVATE(msg), strerror(oserr),
80 sizeof(LIBELF_PRIVATE(msg)));
81 return (const char *)&LIBELF_PRIVATE(msg);
82 }
83 return _libelf_errors[error];
84 }
85
86 #if defined(LIBELF_TEST_HOOKS)
87
88 const char *
_libelf_get_unknown_error_message(void)89 _libelf_get_unknown_error_message(void)
90 {
91 return _libelf_errors[ELF_E_NUM];
92 }
93
94 const char *
_libelf_get_no_error_message(void)95 _libelf_get_no_error_message(void)
96 {
97 return _libelf_errors[0];
98 }
99
100 #endif /* LIBELF_TEST_HOOKS */
101