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.  */
41static __thread int global_error;
42
43
44int
45dwarf_errno (void)
46{
47  int result = global_error;
48  global_error = DWARF_E_NOERROR;
49  return result;
50}
51INTDEF(dwarf_errno)
52
53
54/* XXX For now we use string pointers.  Once the table stablelizes
55   make it more DSO-friendly.  */
56static 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
102void
103internal_function
104__libdw_seterrno (int value)
105{
106  global_error = (value >= 0 && value < (int) nerrmsgs
107		  ? value : DWARF_E_UNKNOWN_ERROR);
108}
109
110
111const char *
112dwarf_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}
123INTDEF(dwarf_errmsg)
124