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)
42 size_t fsz, msz, count;
43 int elfclass, elftype;
45 uint64_t sh_align, sh_offset, sh_size;
46 int (*xlate)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap);
48 if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF ||
49 (d != NULL && s != d->d_scn)) {
50 LIBELF_SET_ERROR(ARGUMENT, 0);
54 if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL)
58 return (STAILQ_NEXT(d, d_next));
60 if (e->e_rawfile == NULL) {
61 LIBELF_SET_ERROR(SEQUENCE, 0);
65 elfclass = e->e_class;
67 assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64);
69 if (elfclass == ELFCLASS32) {
70 sh_type = s->s_shdr.s_shdr32.sh_type;
71 sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
72 sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
73 sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
75 sh_type = s->s_shdr.s_shdr64.sh_type;
76 sh_offset = s->s_shdr.s_shdr64.sh_offset;
77 sh_size = s->s_shdr.s_shdr64.sh_size;
78 sh_align = s->s_shdr.s_shdr64.sh_addralign;
81 if (sh_type == SHT_NULL)
84 if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST ||
85 elftype > ELF_T_LAST || (sh_type != SHT_NOBITS &&
86 sh_offset + sh_size > (uint64_t) e->e_rawsize)) {
87 LIBELF_SET_ERROR(SECTION, 0);
91 if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)
92 (elftype, (size_t) 1, e->e_version)) == 0) {
93 LIBELF_SET_ERROR(UNIMPL, 0);
98 LIBELF_SET_ERROR(SECTION, 0);
102 count = sh_size / fsz;
104 msz = _libelf_msize(elftype, elfclass, e->e_version);
108 if ((d = _libelf_allocate_data(s)) == NULL)
113 d->d_align = sh_align;
114 d->d_size = msz * count;
116 d->d_version = e->e_version;
118 if (sh_type == SHT_NOBITS || sh_size == 0) {
119 STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
123 if ((d->d_buf = malloc(msz*count)) == NULL) {
124 (void) _libelf_release_data(d);
125 LIBELF_SET_ERROR(RESOURCE, 0);
129 d->d_flags |= LIBELF_F_MALLOCED;
131 xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass);
132 if (!(*xlate)(d->d_buf, d->d_size, e->e_rawfile + sh_offset, count,
133 e->e_byteorder != LIBELF_PRIVATE(byteorder))) {
134 _libelf_release_data(d);
135 LIBELF_SET_ERROR(DATA, 0);
139 STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
145 elf_newdata(Elf_Scn *s)
150 if (s == NULL || (e = s->s_elf) == NULL ||
151 e->e_kind != ELF_K_ELF) {
152 LIBELF_SET_ERROR(ARGUMENT, 0);
157 * elf_newdata() has to append a data descriptor, so
158 * bring in existing section data if not already present.
160 if (e->e_rawfile && s->s_size > 0 && STAILQ_EMPTY(&s->s_data))
161 if (elf_getdata(s, NULL) == NULL)
164 if ((d = _libelf_allocate_data(s)) == NULL)
167 STAILQ_INSERT_TAIL(&s->s_data, d, d_next);
171 d->d_off = (uint64_t) ~0;
173 d->d_type = ELF_T_BYTE;
174 d->d_version = LIBELF_PRIVATE(version);
176 (void) elf_flagscn(s, ELF_C_SET, ELF_F_DIRTY);
182 * Retrieve a data descriptor for raw (untranslated) data for section
187 elf_rawdata(Elf_Scn *s, Elf_Data *d)
192 uint64_t sh_align, sh_offset, sh_size;
194 if (s == NULL || (e = s->s_elf) == NULL ||
195 e->e_kind != ELF_K_ELF || e->e_rawfile == NULL) {
196 LIBELF_SET_ERROR(ARGUMENT, 0);
200 if (d == NULL && (d = STAILQ_FIRST(&s->s_rawdata)) != NULL)
204 return (STAILQ_NEXT(d, d_next));
206 elf_class = e->e_class;
208 assert(elf_class == ELFCLASS32 || elf_class == ELFCLASS64);
210 if (elf_class == ELFCLASS32) {
211 sh_type = s->s_shdr.s_shdr32.sh_type;
212 sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
213 sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size;
214 sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
216 sh_type = s->s_shdr.s_shdr64.sh_type;
217 sh_offset = s->s_shdr.s_shdr64.sh_offset;
218 sh_size = s->s_shdr.s_shdr64.sh_size;
219 sh_align = s->s_shdr.s_shdr64.sh_addralign;
222 if (sh_type == SHT_NULL)
225 if ((d = _libelf_allocate_data(s)) == NULL)
228 d->d_buf = (sh_type == SHT_NOBITS || sh_size == 0) ? NULL :
229 e->e_rawfile + sh_offset;
231 d->d_align = sh_align;
233 d->d_type = ELF_T_BYTE;
234 d->d_version = e->e_version;
236 STAILQ_INSERT_TAIL(&s->s_rawdata, d, d_next);