elf_flag.c revision 260684 
1/*-
2 * Copyright (c) 2006,2008-2009,2011 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
29#include <libelf.h>
30
31#include "_libelf.h"
32
33ELFTC_VCSID("$Id: elf_flag.c 2272 2011-12-03 17:07:31Z jkoshy $");
34
35unsigned int
36elf_flagarhdr(Elf_Arhdr *a, Elf_Cmd c, unsigned int flags)
37{
38	unsigned int r;
39
40	if (a == NULL)
41		return (0);
42
43	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
44	    (flags & ~ELF_F_DIRTY) != 0) {
45		LIBELF_SET_ERROR(ARGUMENT, 0);
46		return (0);
47	}
48
49	if (c == ELF_C_SET)
50		r = a->ar_flags |= flags;
51	else
52		r = a->ar_flags &= ~flags;
53
54	return (r & LIBELF_F_API_MASK);
55}
56
57unsigned int
58elf_flagdata(Elf_Data *d, Elf_Cmd c, unsigned int flags)
59{
60	unsigned int r;
61	struct _Libelf_Data *ld;
62
63	if (d == NULL)
64		return (0);
65
66	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
67	    (flags & ~ELF_F_DIRTY) != 0) {
68		LIBELF_SET_ERROR(ARGUMENT, 0);
69		return (0);
70	}
71
72	ld = (struct _Libelf_Data *) d;
73
74	if (c == ELF_C_SET)
75		r = ld->d_flags |= flags;
76	else
77		r = ld->d_flags &= ~flags;
78
79	return (r & LIBELF_F_API_MASK);
80}
81
82unsigned int
83elf_flagehdr(Elf *e, Elf_Cmd c, unsigned int flags)
84{
85	int ec;
86	void *ehdr;
87
88	if (e == NULL)
89		return (0);
90
91	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
92	    (e->e_kind != ELF_K_ELF) || (flags & ~ELF_F_DIRTY) != 0 ||
93	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
94		LIBELF_SET_ERROR(ARGUMENT, 0);
95		return (0);
96	}
97
98	if (ec == ELFCLASS32)
99		ehdr = e->e_u.e_elf.e_ehdr.e_ehdr32;
100	else
101		ehdr = e->e_u.e_elf.e_ehdr.e_ehdr64;
102
103	if (ehdr == NULL) {
104		LIBELF_SET_ERROR(SEQUENCE, 0);
105		return (0);
106	}
107
108	return (elf_flagelf(e, c, flags));
109}
110
111unsigned int
112elf_flagelf(Elf *e, Elf_Cmd c, unsigned int flags)
113{
114	int r;
115
116	if (e == NULL)
117		return (0);
118
119	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
120	    (e->e_kind != ELF_K_ELF) ||
121	    (flags & ~(ELF_F_ARCHIVE | ELF_F_ARCHIVE_SYSV |
122	    ELF_F_DIRTY | ELF_F_LAYOUT)) != 0) {
123		LIBELF_SET_ERROR(ARGUMENT, 0);
124		return (0);
125	}
126
127	if ((flags & ELF_F_ARCHIVE_SYSV) && (flags & ELF_F_ARCHIVE) == 0) {
128		LIBELF_SET_ERROR(ARGUMENT, 0);
129		return (0);
130	}
131
132	if ((flags & ELF_F_ARCHIVE) && e->e_cmd != ELF_C_WRITE) {
133		LIBELF_SET_ERROR(MODE, 0);
134		return (0);
135	}
136
137	if (c == ELF_C_SET)
138		r = e->e_flags |= flags;
139	else
140		r = e->e_flags &= ~flags;
141	return (r & LIBELF_F_API_MASK);
142}
143
144unsigned int
145elf_flagphdr(Elf *e, Elf_Cmd c, unsigned int flags)
146{
147	int ec;
148	void *phdr;
149
150	if (e == NULL)
151		return (0);
152
153	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
154	    (e->e_kind != ELF_K_ELF) || (flags & ~ELF_F_DIRTY) != 0 ||
155	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
156		LIBELF_SET_ERROR(ARGUMENT, 0);
157		return (0);
158	}
159
160	if (ec == ELFCLASS32)
161		phdr = e->e_u.e_elf.e_phdr.e_phdr32;
162	else
163		phdr = e->e_u.e_elf.e_phdr.e_phdr64;
164
165	if (phdr == NULL) {
166		LIBELF_SET_ERROR(SEQUENCE, 0);
167		return (0);
168	}
169
170	return (elf_flagelf(e, c, flags));
171}
172
173unsigned int
174elf_flagscn(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
175{
176	int r;
177
178	if (s == NULL)
179		return (0);
180
181	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
182	    (flags & ~ELF_F_DIRTY) != 0) {
183		LIBELF_SET_ERROR(ARGUMENT, 0);
184		return (0);
185	}
186
187	if (c == ELF_C_SET)
188		r = s->s_flags |= flags;
189	else
190		r = s->s_flags &= ~flags;
191	return (r & LIBELF_F_API_MASK);
192}
193
194unsigned int
195elf_flagshdr(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
196{
197	return (elf_flagscn(s, c, flags));
198}
199