1 /* Retrieve ELF descriptor used for DWARF access.
2 Copyright (C) 2002, 2003, 2004, 2005, 2009, 2014, 2015 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <assert.h>
35 #include <stddef.h>
36
37 #include "libdwP.h"
38
39
40 /* The error number. */
41 static __thread int global_error;
42
43
44 int
dwarf_errno(void)45 dwarf_errno (void)
46 {
47 int result = global_error;
48 global_error = DWARF_E_NOERROR;
49 return result;
50 }
51 INTDEF(dwarf_errno)
52
53
54 /* XXX For now we use string pointers. Once the table stablelizes
55 make it more DSO-friendly. */
56 static const char *errmsgs[] =
57 {
58 [DWARF_E_NOERROR] = N_("no error"),
59 [DWARF_E_UNKNOWN_ERROR] = N_("unknown error"),
60 [DWARF_E_INVALID_ACCESS] = N_("invalid access"),
61 [DWARF_E_NO_REGFILE] = N_("no regular file"),
62 [DWARF_E_IO_ERROR] = N_("I/O error"),
63 [DWARF_E_INVALID_ELF] = N_("invalid ELF file"),
64 [DWARF_E_NO_DWARF] = N_("no DWARF information"),
65 [DWARF_E_COMPRESSED_ERROR] = N_("cannot decompress DWARF"),
66 [DWARF_E_NOELF] = N_("no ELF file"),
67 [DWARF_E_GETEHDR_ERROR] = N_("cannot get ELF header"),
68 [DWARF_E_NOMEM] = N_("out of memory"),
69 [DWARF_E_UNIMPL] = N_("not implemented"),
70 [DWARF_E_INVALID_CMD] = N_("invalid command"),
71 [DWARF_E_INVALID_VERSION] = N_("invalid version"),
72 [DWARF_E_INVALID_FILE] = N_("invalid file"),
73 [DWARF_E_NO_ENTRY] = N_("no entries found"),
74 [DWARF_E_INVALID_DWARF] = N_("invalid DWARF"),
75 [DWARF_E_NO_STRING] = N_("no string data"),
76 [DWARF_E_NO_ADDR] = N_("no address value"),
77 [DWARF_E_NO_CONSTANT] = N_("no constant value"),
78 [DWARF_E_NO_REFERENCE] = N_("no reference value"),
79 [DWARF_E_INVALID_REFERENCE] = N_("invalid reference value"),
80 [DWARF_E_NO_DEBUG_LINE] = N_(".debug_line section missing"),
81 [DWARF_E_INVALID_DEBUG_LINE] = N_("invalid .debug_line section"),
82 [DWARF_E_TOO_BIG] = N_("debug information too big"),
83 [DWARF_E_VERSION] = N_("invalid DWARF version"),
84 [DWARF_E_INVALID_DIR_IDX] = N_("invalid directory index"),
85 [DWARF_E_ADDR_OUTOFRANGE] = N_("address out of range"),
86 [DWARF_E_NO_LOCLIST] = N_("no location list value"),
87 [DWARF_E_NO_BLOCK] = N_("no block data"),
88 [DWARF_E_INVALID_LINE_IDX] = N_("invalid line index"),
89 [DWARF_E_INVALID_ARANGE_IDX] = N_("invalid address range index"),
90 [DWARF_E_NO_MATCH] = N_("no matching address range"),
91 [DWARF_E_NO_FLAG] = N_("no flag value"),
92 [DWARF_E_INVALID_OFFSET] = N_("invalid offset"),
93 [DWARF_E_NO_DEBUG_RANGES] = N_(".debug_ranges section missing"),
94 [DWARF_E_INVALID_CFI] = N_("invalid CFI section"),
95 [DWARF_E_NO_ALT_DEBUGLINK] = N_("no alternative debug link found"),
96 [DWARF_E_INVALID_OPCODE] = N_("invalid opcode"),
97 [DWARF_E_NOT_CUDIE] = N_("not a CU (unit) DIE"),
98 };
99 #define nerrmsgs (sizeof (errmsgs) / sizeof (errmsgs[0]))
100
101
102 void
103 internal_function
__libdw_seterrno(int value)104 __libdw_seterrno (int value)
105 {
106 global_error = (value >= 0 && value < (int) nerrmsgs
107 ? value : DWARF_E_UNKNOWN_ERROR);
108 }
109
110
111 const char *
dwarf_errmsg(int error)112 dwarf_errmsg (int error)
113 {
114 int last_error = global_error;
115
116 if (error == 0)
117 return last_error != 0 ? _(errmsgs[last_error]) : NULL;
118 else if (error < -1 || error >= (int) nerrmsgs)
119 return _(errmsgs[DWARF_E_UNKNOWN_ERROR]);
120
121 return _(errmsgs[error == -1 ? last_error : error]);
122 }
123 INTDEF(dwarf_errmsg)
124