--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/elf4rom/libs/libelf-0.8.10/lib/cook.c Fri Jan 15 09:07:44 2010 +0000
@@ -0,0 +1,501 @@
+/*
+ * cook.c - read and translate ELF files.
+ * Copyright (C) 1995 - 2006 Michael Riepe
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <private.h>
+
+#ifndef lint
+static const char rcsid[] = "@(#) $Id: cook.c,v 1.28 2006/07/07 22:15:50 michael Exp $";
+#endif /* lint */
+
+const Elf_Scn _elf_scn_init = INIT_SCN;
+const Scn_Data _elf_data_init = INIT_DATA;
+
+Elf_Type
+_elf_scn_type(unsigned t) {
+ switch (t) {
+ case SHT_DYNAMIC: return ELF_T_DYN;
+ case SHT_DYNSYM: return ELF_T_SYM;
+ case SHT_HASH: return ELF_T_WORD;
+ case SHT_REL: return ELF_T_REL;
+ case SHT_RELA: return ELF_T_RELA;
+ case SHT_SYMTAB: return ELF_T_SYM;
+ case SHT_SYMTAB_SHNDX: return ELF_T_WORD; /* XXX: really? */
+#if __LIBELF_SYMBOL_VERSIONS
+#if __LIBELF_SUN_SYMBOL_VERSIONS
+ case SHT_SUNW_verdef: return ELF_T_VDEF;
+ case SHT_SUNW_verneed: return ELF_T_VNEED;
+ case SHT_SUNW_versym: return ELF_T_HALF;
+#else /* __LIBELF_SUN_SYMBOL_VERSIONS */
+ case SHT_GNU_verdef: return ELF_T_VDEF;
+ case SHT_GNU_verneed: return ELF_T_VNEED;
+ case SHT_GNU_versym: return ELF_T_HALF;
+#endif /* __LIBELF_SUN_SYMBOL_VERSIONS */
+#endif /* __LIBELF_SYMBOL_VERSIONS */
+ }
+ return ELF_T_BYTE;
+}
+
+/*
+ * Check for overflow on 32-bit systems
+ */
+#define overflow(a,b,t) (sizeof(a) < sizeof(t) && (t)(a) != (b))
+
+#define truncerr(t) ((t)==ELF_T_EHDR?ERROR_TRUNC_EHDR: \
+ ((t)==ELF_T_PHDR?ERROR_TRUNC_PHDR: \
+ ERROR_INTERNAL))
+#define memerr(t) ((t)==ELF_T_EHDR?ERROR_MEM_EHDR: \
+ ((t)==ELF_T_PHDR?ERROR_MEM_PHDR: \
+ ERROR_INTERNAL))
+
+Elf_Data*
+_elf_xlatetom(const Elf *elf, Elf_Data *dst, const Elf_Data *src) {
+ if (elf->e_class == ELFCLASS32) {
+ return elf32_xlatetom(dst, src, elf->e_encoding);
+ }
+#if __LIBELF64
+ else if (elf->e_class == ELFCLASS64) {
+ return elf64_xlatetom(dst, src, elf->e_encoding);
+ }
+#endif /* __LIBELF64 */
+ seterr(ERROR_UNIMPLEMENTED);
+ return NULL;
+}
+
+static char*
+_elf_item(void *buf, Elf *elf, Elf_Type type, size_t off) {
+ Elf_Data src, dst;
+
+ elf_assert(valid_type(type));
+ if (off < 0 || off > elf->e_size) {
+ seterr(ERROR_OUTSIDE);
+ return NULL;
+ }
+
+ src.d_type = type;
+ src.d_version = elf->e_version;
+ src.d_size = _fsize(elf->e_class, src.d_version, type);
+ elf_assert(src.d_size);
+ if ((elf->e_size - off) < src.d_size) {
+ seterr(truncerr(type));
+ return NULL;
+ }
+
+ dst.d_version = _elf_version;
+ dst.d_size = _msize(elf->e_class, dst.d_version, type);
+ elf_assert(dst.d_size);
+
+ if (!(dst.d_buf = buf) && !(dst.d_buf = malloc(dst.d_size))) {
+ seterr(memerr(type));
+ return NULL;
+ }
+
+ elf_assert(elf->e_data);
+ if (elf->e_rawdata) {
+ src.d_buf = elf->e_rawdata + off;
+ }
+ else {
+ src.d_buf = elf->e_data + off;
+ }
+
+ if (_elf_xlatetom(elf, &dst, &src)) {
+ return (char*)dst.d_buf;
+ }
+ if (dst.d_buf != buf) {
+ free(dst.d_buf);
+ }
+ return NULL;
+}
+
+static int
+_elf_cook_phdr(Elf *elf) {
+ size_t num, off, entsz;
+
+ if (elf->e_class == ELFCLASS32) {
+ num = ((Elf32_Ehdr*)elf->e_ehdr)->e_phnum;
+ off = ((Elf32_Ehdr*)elf->e_ehdr)->e_phoff;
+ entsz = ((Elf32_Ehdr*)elf->e_ehdr)->e_phentsize;
+ }
+#if __LIBELF64
+ else if (elf->e_class == ELFCLASS64) {
+ num = ((Elf64_Ehdr*)elf->e_ehdr)->e_phnum;
+ off = ((Elf64_Ehdr*)elf->e_ehdr)->e_phoff;
+ entsz = ((Elf64_Ehdr*)elf->e_ehdr)->e_phentsize;
+ /*
+ * Check for overflow on 32-bit systems
+ */
+ if (overflow(off, ((Elf64_Ehdr*)elf->e_ehdr)->e_phoff, Elf64_Off)) {
+ seterr(ERROR_OUTSIDE);
+ return 0;
+ }
+ }
+#endif /* __LIBELF64 */
+ else {
+ seterr(ERROR_UNIMPLEMENTED);
+ return 0;
+ }
+ if (off) {
+ Elf_Scn *scn;
+ size_t size;
+ unsigned i;
+ char *p;
+
+ if (num == PN_XNUM) {
+ /*
+ * Overflow in ehdr->e_phnum.
+ * Get real value from first SHDR.
+ */
+ if (!(scn = elf->e_scn_1)) {
+ seterr(ERROR_NOSUCHSCN);
+ return 0;
+ }
+ if (elf->e_class == ELFCLASS32) {
+ num = scn->s_shdr32.sh_info;
+ }
+#if __LIBELF64
+ else if (elf->e_class == ELFCLASS64) {
+ num = scn->s_shdr64.sh_info;
+ }
+#endif /* __LIBELF64 */
+ /* we already had this
+ else {
+ seterr(ERROR_UNIMPLEMENTED);
+ return 0;
+ }
+ */
+ }
+
+ size = _fsize(elf->e_class, elf->e_version, ELF_T_PHDR);
+ elf_assert(size);
+#if ENABLE_EXTENDED_FORMAT
+ if (entsz < size) {
+#else /* ENABLE_EXTENDED_FORMAT */
+ if (entsz != size) {
+#endif /* ENABLE_EXTENDED_FORMAT */
+ seterr(ERROR_EHDR_PHENTSIZE);
+ return 0;
+ }
+ size = _msize(elf->e_class, _elf_version, ELF_T_PHDR);
+ elf_assert(size);
+ if (!(p = malloc(num * size))) {
+ seterr(memerr(ELF_T_PHDR));
+ return 0;
+ }
+ for (i = 0; i < num; i++) {
+ if (!_elf_item(p + i * size, elf, ELF_T_PHDR, off + i * entsz)) {
+ free(p);
+ return 0;
+ }
+ }
+ elf->e_phdr = p;
+ elf->e_phnum = num;
+ }
+ return 1;
+}
+
+static int
+_elf_cook_shdr(Elf *elf) {
+ size_t num, off, entsz;
+
+ if (elf->e_class == ELFCLASS32) {
+ num = ((Elf32_Ehdr*)elf->e_ehdr)->e_shnum;
+ off = ((Elf32_Ehdr*)elf->e_ehdr)->e_shoff;
+ entsz = ((Elf32_Ehdr*)elf->e_ehdr)->e_shentsize;
+ }
+#if __LIBELF64
+ else if (elf->e_class == ELFCLASS64) {
+ num = ((Elf64_Ehdr*)elf->e_ehdr)->e_shnum;
+ off = ((Elf64_Ehdr*)elf->e_ehdr)->e_shoff;
+ entsz = ((Elf64_Ehdr*)elf->e_ehdr)->e_shentsize;
+ /*
+ * Check for overflow on 32-bit systems
+ */
+ if (overflow(off, ((Elf64_Ehdr*)elf->e_ehdr)->e_shoff, Elf64_Off)) {
+ seterr(ERROR_OUTSIDE);
+ return 0;
+ }
+ }
+#endif /* __LIBELF64 */
+ else {
+ seterr(ERROR_UNIMPLEMENTED);
+ return 0;
+ }
+ if (off) {
+ struct tmp {
+ Elf_Scn scn;
+ Scn_Data data;
+ } *head;
+ Elf_Data src, dst;
+ Elf_Scn *scn;
+ Scn_Data *sd;
+ unsigned i;
+
+ if (off < 0 || off > elf->e_size) {
+ seterr(ERROR_OUTSIDE);
+ return 0;
+ }
+
+ src.d_type = ELF_T_SHDR;
+ src.d_version = elf->e_version;
+ src.d_size = _fsize(elf->e_class, src.d_version, ELF_T_SHDR);
+ elf_assert(src.d_size);
+#if ENABLE_EXTENDED_FORMAT
+ if (entsz < src.d_size) {
+#else /* ENABLE_EXTENDED_FORMAT */
+ if (entsz != src.d_size) {
+#endif /* ENABLE_EXTENDED_FORMAT */
+ seterr(ERROR_EHDR_SHENTSIZE);
+ return 0;
+ }
+ dst.d_version = EV_CURRENT;
+
+ if (num == 0) {
+ union {
+ Elf32_Shdr sh32;
+#if __LIBELF64
+ Elf64_Shdr sh64;
+#endif /* __LIBELF64 */
+ } u;
+
+ /*
+ * Overflow in ehdr->e_shnum.
+ * Get real value from first SHDR.
+ */
+ if (elf->e_size - off < entsz) {
+ seterr(ERROR_TRUNC_SHDR);
+ return 0;
+ }
+ if (elf->e_rawdata) {
+ src.d_buf = elf->e_rawdata + off;
+ }
+ else {
+ src.d_buf = elf->e_data + off;
+ }
+ dst.d_buf = &u;
+ dst.d_size = sizeof(u);
+ if (!_elf_xlatetom(elf, &dst, &src)) {
+ return 0;
+ }
+ elf_assert(dst.d_size == _msize(elf->e_class, EV_CURRENT, ELF_T_SHDR));
+ elf_assert(dst.d_type == ELF_T_SHDR);
+ if (elf->e_class == ELFCLASS32) {
+ num = u.sh32.sh_size;
+ }
+#if __LIBELF64
+ else if (elf->e_class == ELFCLASS64) {
+ num = u.sh64.sh_size;
+ /*
+ * Check for overflow on 32-bit systems
+ */
+ if (overflow(num, u.sh64.sh_size, Elf64_Xword)) {
+ seterr(ERROR_OUTSIDE);
+ return 0;
+ }
+ }
+#endif /* __LIBELF64 */
+ }
+
+ if ((elf->e_size - off) / entsz < num) {
+ seterr(ERROR_TRUNC_SHDR);
+ return 0;
+ }
+
+ if (!(head = (struct tmp*)malloc(num * sizeof(struct tmp)))) {
+ seterr(ERROR_MEM_SCN);
+ return 0;
+ }
+ for (scn = NULL, i = num; i-- > 0; ) {
+ head[i].scn = _elf_scn_init;
+ head[i].data = _elf_data_init;
+ head[i].scn.s_link = scn;
+ if (!scn) {
+ elf->e_scn_n = &head[i].scn;
+ }
+ scn = &head[i].scn;
+ sd = &head[i].data;
+
+ if (elf->e_rawdata) {
+ src.d_buf = elf->e_rawdata + off + i * entsz;
+ }
+ else {
+ src.d_buf = elf->e_data + off + i * entsz;
+ }
+ dst.d_buf = &scn->s_uhdr;
+ dst.d_size = sizeof(scn->s_uhdr);
+ if (!_elf_xlatetom(elf, &dst, &src)) {
+ elf->e_scn_n = NULL;
+ free(head);
+ return 0;
+ }
+ elf_assert(dst.d_size == _msize(elf->e_class, EV_CURRENT, ELF_T_SHDR));
+ elf_assert(dst.d_type == ELF_T_SHDR);
+
+ scn->s_elf = elf;
+ scn->s_index = i;
+ scn->s_data_1 = sd;
+ scn->s_data_n = sd;
+
+ sd->sd_scn = scn;
+
+ if (elf->e_class == ELFCLASS32) {
+ Elf32_Shdr *shdr = &scn->s_shdr32;
+
+ scn->s_type = shdr->sh_type;
+ scn->s_size = shdr->sh_size;
+ scn->s_offset = shdr->sh_offset;
+ sd->sd_data.d_align = shdr->sh_addralign;
+ sd->sd_data.d_type = _elf_scn_type(scn->s_type);
+ }
+#if __LIBELF64
+ else if (elf->e_class == ELFCLASS64) {
+ Elf64_Shdr *shdr = &scn->s_shdr64;
+
+ scn->s_type = shdr->sh_type;
+ scn->s_size = shdr->sh_size;
+ scn->s_offset = shdr->sh_offset;
+ sd->sd_data.d_align = shdr->sh_addralign;
+ /*
+ * Check for overflow on 32-bit systems
+ */
+ if (overflow(scn->s_size, shdr->sh_size, Elf64_Xword)
+ || overflow(scn->s_offset, shdr->sh_offset, Elf64_Off)
+ || overflow(sd->sd_data.d_align, shdr->sh_addralign, Elf64_Xword)) {
+ seterr(ERROR_OUTSIDE);
+ return 0;
+ }
+ sd->sd_data.d_type = _elf_scn_type(scn->s_type);
+ /*
+ * QUIRKS MODE:
+ *
+ * Some 64-bit architectures use 64-bit entries in the
+ * .hash section. This violates the ELF standard, and
+ * should be fixed. It's mostly harmless as long as the
+ * binary and the machine running your program have the
+ * same byte order, but you're in trouble if they don't,
+ * and if the entry size is wrong.
+ *
+ * As a workaround, I let libelf guess the right size
+ * for the binary. This relies pretty much on the fact
+ * that the binary provides correct data in the section
+ * headers. If it doesn't, it's probably broken anyway.
+ * Therefore, libelf uses a standard conforming value
+ * when it's not absolutely sure.
+ */
+ if (scn->s_type == SHT_HASH) {
+ int override = 0;
+
+ /*
+ * sh_entsize must reflect the entry size
+ */
+ if (shdr->sh_entsize == ELF64_FSZ_ADDR) {
+ override++;
+ }
+ /*
+ * sh_size must be a multiple of sh_entsize
+ */
+ if (shdr->sh_size % ELF64_FSZ_ADDR == 0) {
+ override++;
+ }
+ /*
+ * There must be room for at least 2 entries
+ */
+ if (shdr->sh_size >= 2 * ELF64_FSZ_ADDR) {
+ override++;
+ }
+ /*
+ * sh_addralign must be correctly set
+ */
+ if (shdr->sh_addralign == ELF64_FSZ_ADDR) {
+ override++;
+ }
+ /*
+ * The section must be properly aligned
+ */
+ if (shdr->sh_offset % ELF64_FSZ_ADDR == 0) {
+ override++;
+ }
+ /* XXX: also look at the data? */
+ /*
+ * Make a conservative decision...
+ */
+ if (override >= 5) {
+ sd->sd_data.d_type = ELF_T_ADDR;
+ }
+ }
+ /*
+ * END QUIRKS MODE.
+ */
+ }
+#endif /* __LIBELF64 */
+ /* we already had this
+ else {
+ seterr(ERROR_UNIMPLEMENTED);
+ return 0;
+ }
+ */
+
+ sd->sd_data.d_size = scn->s_size;
+ sd->sd_data.d_version = _elf_version;
+ }
+ elf_assert(scn == &head[0].scn);
+ elf->e_scn_1 = &head[0].scn;
+ head[0].scn.s_freeme = 1;
+ }
+ return 1;
+}
+
+static int
+_elf_cook_file(Elf *elf) {
+ elf->e_ehdr = _elf_item(NULL, elf, ELF_T_EHDR, 0);
+ if (!elf->e_ehdr) {
+ return 0;
+ }
+ /*
+ * Note: _elf_cook_phdr may require the first section header!
+ */
+ if (!_elf_cook_shdr(elf)) {
+ return 0;
+ }
+ if (!_elf_cook_phdr(elf)) {
+ return 0;
+ }
+ return 1;
+}
+
+int
+_elf_cook(Elf *elf) {
+ elf_assert(_elf_scn_init.s_magic == SCN_MAGIC);
+ elf_assert(_elf_data_init.sd_magic == DATA_MAGIC);
+ elf_assert(elf);
+ elf_assert(elf->e_magic == ELF_MAGIC);
+ elf_assert(elf->e_kind == ELF_K_ELF);
+ elf_assert(!elf->e_ehdr);
+ if (!valid_version(elf->e_version)) {
+ seterr(ERROR_UNKNOWN_VERSION);
+ }
+ else if (!valid_encoding(elf->e_encoding)) {
+ seterr(ERROR_UNKNOWN_ENCODING);
+ }
+ else if (valid_class(elf->e_class)) {
+ return _elf_cook_file(elf);
+ }
+ else {
+ seterr(ERROR_UNKNOWN_CLASS);
+ }
+ return 0;
+}