source: rtems-tools/linkers/elftoolchain/libelf/libelf_phdr.c @ ec24a37

4.104.115
Last change on this file since ec24a37 was ec24a37, checked in by Chris Johns <chrisj@…>, on 05/06/12 at 22:47:11

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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 <sys/cdefs.h>
28
29#include <assert.h>
30#include <gelf.h>
31#include <libelf.h>
32#include <stdlib.h>
33
34#include "_libelf.h"
35
36LIBELF_VCSID("$Id: libelf_phdr.c 1677 2011-07-28 04:35:53Z jkoshy $");
37
38void *
39_libelf_getphdr(Elf *e, int ec)
40{
41        size_t phnum, phentsize;
42        size_t fsz, msz;
43        uint64_t phoff;
44        Elf32_Ehdr *eh32;
45        Elf64_Ehdr *eh64;
46        void *ehdr, *phdr;
47        int (*xlator)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap);
48
49        assert(ec == ELFCLASS32 || ec == ELFCLASS64);
50
51        if (e == NULL) {
52                LIBELF_SET_ERROR(ARGUMENT, 0);
53                return (NULL);
54        }
55
56        if ((phdr = (ec == ELFCLASS32 ?
57                 (void *) e->e_u.e_elf.e_phdr.e_phdr32 :
58                 (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL)
59                return (phdr);
60
61        /*
62         * Check the PHDR related fields in the EHDR for sanity.
63         */
64
65        if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
66                return (NULL);
67
68        phnum = e->e_u.e_elf.e_nphdr;
69
70        if (ec == ELFCLASS32) {
71                eh32      = (Elf32_Ehdr *) ehdr;
72                phentsize = eh32->e_phentsize;
73                phoff     = (uint64_t) eh32->e_phoff;
74        } else {
75                eh64      = (Elf64_Ehdr *) ehdr;
76                phentsize = eh64->e_phentsize;
77                phoff     = (uint64_t) eh64->e_phoff;
78        }
79
80        fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version);
81
82        assert(fsz > 0);
83
84        if ((uint64_t) e->e_rawsize < (phoff + fsz)) {
85                LIBELF_SET_ERROR(HEADER, 0);
86                return (NULL);
87        }
88
89        msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT);
90
91        assert(msz > 0);
92
93        if ((phdr = calloc(phnum, msz)) == NULL) {
94                LIBELF_SET_ERROR(RESOURCE, 0);
95                return (NULL);
96        }
97
98        if (ec == ELFCLASS32)
99                e->e_u.e_elf.e_phdr.e_phdr32 = phdr;
100        else
101                e->e_u.e_elf.e_phdr.e_phdr64 = phdr;
102
103
104        xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec);
105        (*xlator)(phdr, phnum * msz, e->e_rawfile + phoff, phnum,
106            e->e_byteorder != LIBELF_PRIVATE(byteorder));
107
108        return (phdr);
109}
110
111void *
112_libelf_newphdr(Elf *e, int ec, size_t count)
113{
114        void *ehdr, *newphdr, *oldphdr;
115        size_t msz;
116
117        if (e == NULL) {
118                LIBELF_SET_ERROR(ARGUMENT, 0);
119                return (NULL);
120        }
121
122        if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) {
123                LIBELF_SET_ERROR(SEQUENCE, 0);
124                return (NULL);
125        }
126
127        assert(e->e_class == ec);
128        assert(ec == ELFCLASS32 || ec == ELFCLASS64);
129        assert(e->e_version == EV_CURRENT);
130
131        msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version);
132
133        assert(msz > 0);
134
135        newphdr = NULL;
136        if (count > 0 && (newphdr = calloc(count, msz)) == NULL) {
137                LIBELF_SET_ERROR(RESOURCE, 0);
138                return (NULL);
139        }
140
141        if (ec == ELFCLASS32) {
142                if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL)
143                        free(oldphdr);
144                e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr;
145        } else {
146                if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL)
147                        free(oldphdr);
148                e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr;
149        }
150
151        e->e_u.e_elf.e_nphdr = count;
152
153        elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
154
155        return (newphdr);
156}
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