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 <sys/limits.h>
31
32#include <gelf.h>
33#include <libelf.h>
34
35#include "_libelf.h"
36
37Elf32_Phdr *
38elf32_getphdr(Elf *e)
39{
40	return (_libelf_getphdr(e, ELFCLASS32));
41}
42
43Elf64_Phdr *
44elf64_getphdr(Elf *e)
45{
46	return (_libelf_getphdr(e, ELFCLASS64));
47}
48
49GElf_Phdr *
50gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
51{
52	int ec;
53	Elf32_Ehdr *eh32;
54	Elf64_Ehdr *eh64;
55	Elf32_Phdr *ep32;
56	Elf64_Phdr *ep64;
57
58	if (d == NULL || e == NULL ||
59	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
60	    (e->e_kind != ELF_K_ELF) || index < 0) {
61		LIBELF_SET_ERROR(ARGUMENT, 0);
62		return (NULL);
63	}
64
65	if (ec == ELFCLASS32) {
66		if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
67		    ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
68			return (NULL);
69
70		if (index >= eh32->e_phnum) {
71			LIBELF_SET_ERROR(ARGUMENT, 0);
72			return (NULL);
73		}
74
75		ep32 += index;
76
77		d->p_type   = ep32->p_type;
78		d->p_offset = ep32->p_offset;
79		d->p_vaddr  = (Elf64_Addr) ep32->p_vaddr;
80		d->p_paddr  = (Elf64_Addr) ep32->p_paddr;
81		d->p_filesz = (Elf64_Xword) ep32->p_filesz;
82		d->p_memsz  = (Elf64_Xword) ep32->p_memsz;
83		d->p_flags  = ep32->p_flags;
84		d->p_align  = (Elf64_Xword) ep32->p_align;
85
86	} else {
87		if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
88		    (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
89			return (NULL);
90
91		if (index >= eh64->e_phnum) {
92			LIBELF_SET_ERROR(ARGUMENT, 0);
93			return (NULL);
94		}
95
96		ep64 += index;
97
98		*d = *ep64;
99	}
100
101	return (d);
102}
103
104Elf32_Phdr *
105elf32_newphdr(Elf *e, size_t count)
106{
107	return (_libelf_newphdr(e, ELFCLASS32, count));
108}
109
110Elf64_Phdr *
111elf64_newphdr(Elf *e, size_t count)
112{
113	return (_libelf_newphdr(e, ELFCLASS64, count));
114}
115
116void *
117gelf_newphdr(Elf *e, size_t count)
118{
119	if (e == NULL) {
120		LIBELF_SET_ERROR(ARGUMENT, 0);
121		return (NULL);
122	}
123	return (_libelf_newphdr(e, e->e_class, count));
124}
125
126int
127gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
128{
129	int ec, phnum;
130	void *ehdr;
131	Elf32_Phdr *ph32;
132	Elf64_Phdr *ph64;
133
134	if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
135	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
136		LIBELF_SET_ERROR(ARGUMENT, 0);
137		return (0);
138	}
139
140	if (e->e_cmd == ELF_C_READ) {
141		LIBELF_SET_ERROR(MODE, 0);
142		return (0);
143	}
144
145	if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
146		return (0);
147
148	if (ec == ELFCLASS32)
149		phnum = ((Elf32_Ehdr *) ehdr)->e_phnum;
150	else
151		phnum = ((Elf64_Ehdr *) ehdr)->e_phnum;
152
153	if (ndx < 0 || ndx > phnum) {
154		LIBELF_SET_ERROR(ARGUMENT, 0);
155		return (0);
156	}
157
158	(void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
159
160	if (ec == ELFCLASS64) {
161		ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
162		*ph64 = *s;
163		return (1);
164	}
165
166	ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
167
168	ph32->p_type     =  s->p_type;
169	ph32->p_flags    =  s->p_flags;
170	LIBELF_COPY_U32(ph32, s, p_offset);
171	LIBELF_COPY_U32(ph32, s, p_vaddr);
172	LIBELF_COPY_U32(ph32, s, p_paddr);
173	LIBELF_COPY_U32(ph32, s, p_filesz);
174	LIBELF_COPY_U32(ph32, s, p_memsz);
175	LIBELF_COPY_U32(ph32, s, p_align);
176
177	return (1);
178}
179