elf_flag.c revision 225736 
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: stable/9/lib/libelf/elf_flag.c 164190 2006-11-11 17:16:35Z jkoshy $");
29
30#include <libelf.h>
31
32#include "_libelf.h"
33
34unsigned int
35elf_flagdata(Elf_Data *d, Elf_Cmd c, unsigned int flags)
36{
37	Elf *e;
38	Elf_Scn *scn;
39	unsigned int r;
40
41	if (d == NULL)
42		return (0);
43
44	if ((c != ELF_C_SET && c != ELF_C_CLR) || (scn = d->d_scn) == NULL ||
45	    (e = scn->s_elf) == NULL || e->e_kind != ELF_K_ELF ||
46	    (flags & ~ELF_F_DIRTY) != 0) {
47		LIBELF_SET_ERROR(ARGUMENT, 0);
48		return (0);
49	}
50
51	if (c == ELF_C_SET)
52	    r = scn->s_flags |= flags;
53	else
54	    r = scn->s_flags &= ~flags;
55
56	return (r);
57}
58
59unsigned int
60elf_flagehdr(Elf *e, Elf_Cmd c, unsigned int flags)
61{
62	int ec;
63	void *ehdr;
64
65	if (e == NULL)
66		return (0);
67
68	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
69	    (e->e_kind != ELF_K_ELF) || (flags & ~ELF_F_DIRTY) != 0 ||
70	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
71		LIBELF_SET_ERROR(ARGUMENT, 0);
72		return (0);
73	}
74
75	if (ec == ELFCLASS32)
76		ehdr = e->e_u.e_elf.e_ehdr.e_ehdr32;
77	else
78		ehdr = e->e_u.e_elf.e_ehdr.e_ehdr64;
79
80	if (ehdr == NULL) {
81		LIBELF_SET_ERROR(SEQUENCE, 0);
82		return (0);
83	}
84
85	return (elf_flagelf(e, c, flags));
86}
87
88unsigned int
89elf_flagelf(Elf *e, Elf_Cmd c, unsigned int flags)
90{
91	int r;
92
93	if (e == NULL)
94		return (0);
95
96	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
97	    (e->e_kind != ELF_K_ELF) ||
98	    (flags & ~(ELF_F_DIRTY|ELF_F_LAYOUT)) != 0) {
99		LIBELF_SET_ERROR(ARGUMENT, 0);
100		return (0);
101	}
102
103	if (c == ELF_C_SET)
104		r = e->e_flags |= flags;
105	else
106		r = e->e_flags &= ~flags;
107	return (r);
108}
109
110unsigned int
111elf_flagphdr(Elf *e, Elf_Cmd c, unsigned int flags)
112{
113	int ec;
114	void *phdr;
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) || (flags & ~ELF_F_DIRTY) != 0 ||
121	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
122		LIBELF_SET_ERROR(ARGUMENT, 0);
123		return (0);
124	}
125
126	if (ec == ELFCLASS32)
127		phdr = e->e_u.e_elf.e_phdr.e_phdr32;
128	else
129		phdr = e->e_u.e_elf.e_phdr.e_phdr64;
130
131	if (phdr == NULL) {
132		LIBELF_SET_ERROR(SEQUENCE, 0);
133		return (0);
134	}
135
136	return (elf_flagelf(e, c, flags));
137}
138
139unsigned int
140elf_flagscn(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
141{
142	int r;
143
144	if (s == NULL)
145		return (0);
146
147	if ((c != ELF_C_SET && c != ELF_C_CLR) ||
148	    (flags & ~ELF_F_DIRTY) != 0) {
149		LIBELF_SET_ERROR(ARGUMENT, 0);
150		return (0);
151	}
152
153	if (c == ELF_C_SET)
154		r = s->s_flags |= flags;
155	else
156		r = s->s_flags &= ~flags;
157	return (r);
158}
159
160unsigned int
161elf_flagshdr(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
162{
163	return (elf_flagscn(s, c, flags));
164}
165