1/*-
2 * Copyright (c) 2006,2008 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 <gelf.h>
28#include <libelf.h>
29#include <limits.h>
30#include <stdint.h>
31
32#include "_libelf.h"
33
34ELFTC_VCSID("$Id: gelf_phdr.c,v 1.1 2019/02/01 05:27:38 jsg Exp $");
35
36Elf32_Phdr *
37elf32_getphdr(Elf *e)
38{
39	return (_libelf_getphdr(e, ELFCLASS32));
40}
41
42Elf64_Phdr *
43elf64_getphdr(Elf *e)
44{
45	return (_libelf_getphdr(e, ELFCLASS64));
46}
47
48GElf_Phdr *
49gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
50{
51	int ec;
52	Elf32_Ehdr *eh32;
53	Elf64_Ehdr *eh64;
54	Elf32_Phdr *ep32;
55	Elf64_Phdr *ep64;
56	size_t phnum;
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	    elf_getphdrnum(e, &phnum) < 0) {
62		LIBELF_SET_ERROR(ARGUMENT, 0);
63		return (NULL);
64	}
65
66	if ((size_t)index >= phnum) {
67		LIBELF_SET_ERROR(ARGUMENT, 0);
68		return (NULL);
69	}
70
71	if (ec == ELFCLASS32) {
72		if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
73		    ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
74			return (NULL);
75
76		ep32 += index;
77
78		d->p_type   = ep32->p_type;
79		d->p_offset = ep32->p_offset;
80		d->p_vaddr  = (Elf64_Addr) ep32->p_vaddr;
81		d->p_paddr  = (Elf64_Addr) ep32->p_paddr;
82		d->p_filesz = (Elf64_Xword) ep32->p_filesz;
83		d->p_memsz  = (Elf64_Xword) ep32->p_memsz;
84		d->p_flags  = ep32->p_flags;
85		d->p_align  = (Elf64_Xword) ep32->p_align;
86
87	} else {
88		if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
89		    (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
90			return (NULL);
91
92		ep64 += index;
93
94		*d = *ep64;
95	}
96
97	return (d);
98}
99
100Elf32_Phdr *
101elf32_newphdr(Elf *e, size_t count)
102{
103	return (_libelf_newphdr(e, ELFCLASS32, count));
104}
105
106Elf64_Phdr *
107elf64_newphdr(Elf *e, size_t count)
108{
109	return (_libelf_newphdr(e, ELFCLASS64, count));
110}
111
112void *
113gelf_newphdr(Elf *e, size_t count)
114{
115	if (e == NULL) {
116		LIBELF_SET_ERROR(ARGUMENT, 0);
117		return (NULL);
118	}
119	return (_libelf_newphdr(e, e->e_class, count));
120}
121
122int
123gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
124{
125	int ec;
126	size_t phnum;
127	void *ehdr;
128	Elf32_Phdr *ph32;
129	Elf64_Phdr *ph64;
130
131	if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
132	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
133	    elf_getphdrnum(e, &phnum) < 0) {
134		LIBELF_SET_ERROR(ARGUMENT, 0);
135		return (0);
136	}
137
138	if (e->e_cmd == ELF_C_READ) {
139		LIBELF_SET_ERROR(MODE, 0);
140		return (0);
141	}
142
143	if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
144		return (0);
145
146	if (ndx < 0 || (size_t)ndx > phnum) {
147		LIBELF_SET_ERROR(ARGUMENT, 0);
148		return (0);
149	}
150
151	(void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
152
153	if (ec == ELFCLASS64) {
154		ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
155		*ph64 = *s;
156		return (1);
157	}
158
159	ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
160
161	ph32->p_type     =  s->p_type;
162	ph32->p_flags    =  s->p_flags;
163	LIBELF_COPY_U32(ph32, s, p_offset);
164	LIBELF_COPY_U32(ph32, s, p_vaddr);
165	LIBELF_COPY_U32(ph32, s, p_paddr);
166	LIBELF_COPY_U32(ph32, s, p_filesz);
167	LIBELF_COPY_U32(ph32, s, p_memsz);
168	LIBELF_COPY_U32(ph32, s, p_align);
169
170	return (1);
171}
172