2 * Copyright (c) 2006 Joseph Koshy
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
39 elf_getdata(Elf_Scn *s, Elf_Data *d)
43 size_t fsz, msz, count;
44 int elfclass, elftype;
46 uint64_t sh_align, sh_offset, sh_size;
47 void (*xlate)(char *_d, char *_s, size_t _c, int _swap);
49 if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF ||
50 (d != NULL && s != d->d_scn)) {
51 LIBELF_SET_ERROR(ARGUMENT, 0);
55 if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL)
59 return (STAILQ_NEXT(d, d_next));
61 if (e->e_rawfile == NULL) {
62 LIBELF_SET_ERROR(SEQUENCE, 0);
66 elfclass = e->e_class;
68 assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64);
70 if (elfclass == ELFCLASS32) {
71 sh_type = s->s_shdr.s_shdr32.sh_type;
72 sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
73 sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
74 sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
76 sh_type = s->s_shdr.s_shdr64.sh_type;
77 sh_offset = s->s_shdr.s_shdr64.sh_offset;
78 sh_size = s->s_shdr.s_shdr64.sh_size;
79 sh_align = s->s_shdr.s_shdr64.sh_addralign;
82 if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST ||
83 elftype > ELF_T_LAST ||
84 sh_offset + sh_size > (uint64_t) e->e_rawsize) {
85 LIBELF_SET_ERROR(SECTION, 0);
89 if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(elftype,
90 (size_t) 1, e->e_version)) == 0) {
91 LIBELF_SET_ERROR(UNIMPL, 0);
97 LIBELF_SET_ERROR(SECTION, 0);
101 count = sh_size / fsz;
103 msz = _libelf_msize(elftype, elfclass, e->e_version);
107 if ((dst = malloc(msz*count)) == NULL) {
108 LIBELF_SET_ERROR(RESOURCE, 0);
112 if ((d = _libelf_allocate_data(s)) == NULL)
117 d->d_align = sh_align;
118 d->d_size = msz * count;
120 d->d_version = e->e_version;
122 d->d_flags |= LIBELF_F_MALLOCED;
123 STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
125 xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass);
126 (*xlate)(d->d_buf, e->e_rawfile + sh_offset, count, e->e_byteorder !=
127 LIBELF_PRIVATE(byteorder));
133 elf_newdata(Elf_Scn *s)
138 if (s == NULL || (e = s->s_elf) == NULL ||
139 e->e_kind != ELF_K_ELF) {
140 LIBELF_SET_ERROR(ARGUMENT, 0);
145 * elf_newdata() has to append a data descriptor, so
146 * bring in existing section data if not already present.
148 if (e->e_rawfile && s->s_size > 0 && STAILQ_EMPTY(&s->s_data))
149 if (elf_getdata(s, NULL) == NULL)
152 if ((d = malloc(sizeof(Elf_Data))) == NULL) {
153 LIBELF_SET_ERROR(RESOURCE, errno);
157 STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
163 d->d_off = (uint64_t) ~0;
165 d->d_type = ELF_T_BYTE;
166 d->d_version = LIBELF_PRIVATE(version);
168 (void) elf_flagscn(s, ELF_C_SET, ELF_F_DIRTY);
174 * Retrieve a data descriptor for raw (untranslated) data for section
179 elf_rawdata(Elf_Scn *s, Elf_Data *d)
183 uint64_t sh_align, sh_offset, sh_size;
185 if (s == NULL || (e = s->s_elf) == NULL ||
186 e->e_kind != ELF_K_ELF || e->e_rawfile == NULL) {
187 LIBELF_SET_ERROR(ARGUMENT, 0);
191 if (d == NULL && (d = STAILQ_FIRST(&s->s_rawdata)) != NULL)
195 return (STAILQ_NEXT(d, d_next));
197 elf_class = e->e_class;
199 assert(elf_class == ELFCLASS32 || elf_class == ELFCLASS64);
201 if (elf_class == ELFCLASS32) {
202 sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
203 sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
204 sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
206 sh_offset = s->s_shdr.s_shdr64.sh_offset;
207 sh_size = s->s_shdr.s_shdr64.sh_size;
208 sh_align = s->s_shdr.s_shdr64.sh_addralign;
211 if ((d = _libelf_allocate_data(s)) == NULL)
214 d->d_buf = e->e_rawfile + sh_offset;
216 d->d_align = sh_align;
218 d->d_type = ELF_T_BYTE;
219 d->d_version = e->e_version;
221 STAILQ_INSERT_TAIL(&s->s_rawdata, d, d_next);