408 lines
9.2 KiB
C
408 lines
9.2 KiB
C
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/*
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gelftrans.c - gelf_* translation functions.
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Copyright (C) 2000 - 2001 Michael Riepe
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <private.h>
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#if __LIBELF64
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#ifndef lint
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static const char rcsid[] = "@(#) $Id: gelftrans.c,v 1.10 2008/05/23 08:15:34 michael Exp $";
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#endif /* lint */
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#define check_and_copy(type, d, s, name, eret) \
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do { \
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if (sizeof((d)->name) < sizeof((s)->name) \
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&& (type)(s)->name != (s)->name) { \
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seterr(ERROR_BADVALUE); \
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return (eret); \
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} \
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(d)->name = (type)(s)->name; \
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} while (0)
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/*
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* These macros are missing on some Linux systems
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*/
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#if !defined(ELF32_R_SYM) || !defined(ELF32_R_TYPE) || !defined(ELF32_R_INFO)
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# undef ELF32_R_SYM
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# undef ELF32_R_TYPE
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# undef ELF32_R_INFO
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# define ELF32_R_SYM(i) ((i)>>8)
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# define ELF32_R_TYPE(i) ((unsigned char)(i))
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# define ELF32_R_INFO(s,t) (((s)<<8)+(unsigned char)(t))
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#endif /* !defined(...) */
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#if !defined(ELF64_R_SYM) || !defined(ELF64_R_TYPE) || !defined(ELF64_R_INFO)
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# undef ELF64_R_SYM
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# undef ELF64_R_TYPE
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# undef ELF64_R_INFO
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# define ELF64_R_SYM(i) ((i)>>32)
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# define ELF64_R_TYPE(i) ((i)&0xffffffffL)
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# define ELF64_R_INFO(s,t) (((Elf64_Xword)(s)<<32)+((t)&0xffffffffL))
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#endif /* !defined(...) */
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static char*
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get_addr_and_class(const Elf_Data *data, int ndx, Elf_Type type, unsigned *cls) {
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Scn_Data *sd = (Scn_Data*)data;
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Elf_Scn *scn;
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Elf *elf;
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size_t n;
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if (!sd) {
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return NULL;
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}
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elf_assert(sd->sd_magic == DATA_MAGIC);
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scn = sd->sd_scn;
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elf_assert(scn);
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elf_assert(scn->s_magic == SCN_MAGIC);
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elf = scn->s_elf;
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elf_assert(elf);
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elf_assert(elf->e_magic == ELF_MAGIC);
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if (elf->e_kind != ELF_K_ELF) {
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seterr(ERROR_NOTELF);
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return NULL;
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}
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if (!valid_class(elf->e_class)) {
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seterr(ERROR_UNKNOWN_CLASS);
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return NULL;
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}
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if (data->d_type != type) {
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seterr(ERROR_BADTYPE);
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return NULL;
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}
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n = _msize(elf->e_class, data->d_version, type);
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if (n == 0) {
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seterr(ERROR_UNIMPLEMENTED);
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return NULL;
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}
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if (ndx < 0 || data->d_size < (ndx + 1) * n) {
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seterr(ERROR_BADINDEX);
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return NULL;
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}
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if (!data->d_buf) {
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seterr(ERROR_NULLBUF);
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return NULL;
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}
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if (cls) {
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*cls = elf->e_class;
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}
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return (char*)data->d_buf + n * ndx;
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}
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GElf_Sym*
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gelf_getsym(Elf_Data *src, int ndx, GElf_Sym *dst) {
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GElf_Sym buf;
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unsigned cls;
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char *tmp;
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if (!dst) {
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dst = &buf;
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}
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tmp = get_addr_and_class(src, ndx, ELF_T_SYM, &cls);
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if (!tmp) {
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return NULL;
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}
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if (cls == ELFCLASS64) {
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*dst = *(Elf64_Sym*)tmp;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Sym *src = (Elf32_Sym*)tmp;
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check_and_copy(GElf_Word, dst, src, st_name, NULL);
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check_and_copy(unsigned char, dst, src, st_info, NULL);
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check_and_copy(unsigned char, dst, src, st_other, NULL);
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check_and_copy(GElf_Half, dst, src, st_shndx, NULL);
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check_and_copy(GElf_Addr, dst, src, st_value, NULL);
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check_and_copy(GElf_Xword, dst, src, st_size, NULL);
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}
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else {
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seterr(ERROR_UNIMPLEMENTED);
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return NULL;
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}
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if (dst == &buf) {
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dst = (GElf_Sym*)malloc(sizeof(GElf_Sym));
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if (!dst) {
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seterr(ERROR_MEM_SYM);
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return NULL;
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}
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*dst = buf;
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}
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return dst;
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}
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int
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gelf_update_sym(Elf_Data *dst, int ndx, GElf_Sym *src) {
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unsigned cls;
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char *tmp;
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tmp = get_addr_and_class(dst, ndx, ELF_T_SYM, &cls);
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if (!tmp) {
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return 0;
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}
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if (cls == ELFCLASS64) {
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*(Elf64_Sym*)tmp = *src;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Sym *dst = (Elf32_Sym*)tmp;
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check_and_copy(Elf32_Word, dst, src, st_name, 0);
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check_and_copy(Elf32_Addr, dst, src, st_value, 0);
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check_and_copy(Elf32_Word, dst, src, st_size, 0);
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check_and_copy(unsigned char, dst, src, st_info, 0);
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check_and_copy(unsigned char, dst, src, st_other, 0);
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check_and_copy(Elf32_Half, dst, src, st_shndx, 0);
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}
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else {
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seterr(ERROR_UNIMPLEMENTED);
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return 0;
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}
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return 1;
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}
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GElf_Dyn*
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gelf_getdyn(Elf_Data *src, int ndx, GElf_Dyn *dst) {
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GElf_Dyn buf;
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unsigned cls;
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char *tmp;
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if (!dst) {
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dst = &buf;
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}
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tmp = get_addr_and_class(src, ndx, ELF_T_DYN, &cls);
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if (!tmp) {
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return NULL;
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}
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if (cls == ELFCLASS64) {
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*dst = *(Elf64_Dyn*)tmp;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Dyn *src = (Elf32_Dyn*)tmp;
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check_and_copy(GElf_Sxword, dst, src, d_tag, NULL);
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check_and_copy(GElf_Xword, dst, src, d_un.d_val, NULL);
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}
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else {
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seterr(ERROR_UNIMPLEMENTED);
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return NULL;
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}
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if (dst == &buf) {
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dst = (GElf_Dyn*)malloc(sizeof(GElf_Dyn));
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if (!dst) {
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seterr(ERROR_MEM_DYN);
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return NULL;
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}
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*dst = buf;
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}
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return dst;
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}
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int
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gelf_update_dyn(Elf_Data *dst, int ndx, GElf_Dyn *src) {
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unsigned cls;
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char *tmp;
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tmp = get_addr_and_class(dst, ndx, ELF_T_DYN, &cls);
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if (!tmp) {
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return 0;
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}
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if (cls == ELFCLASS64) {
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*(Elf64_Dyn*)tmp = *src;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Dyn *dst = (Elf32_Dyn*)tmp;
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check_and_copy(Elf32_Sword, dst, src, d_tag, 0);
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check_and_copy(Elf32_Word, dst, src, d_un.d_val, 0);
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}
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else {
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seterr(ERROR_UNIMPLEMENTED);
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return 0;
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}
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return 1;
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}
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GElf_Rela*
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gelf_getrela(Elf_Data *src, int ndx, GElf_Rela *dst) {
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GElf_Rela buf;
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unsigned cls;
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char *tmp;
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if (!dst) {
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dst = &buf;
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}
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tmp = get_addr_and_class(src, ndx, ELF_T_RELA, &cls);
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if (!tmp) {
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return NULL;
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}
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if (cls == ELFCLASS64) {
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*dst = *(Elf64_Rela*)tmp;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Rela *src = (Elf32_Rela*)tmp;
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check_and_copy(GElf_Addr, dst, src, r_offset, NULL);
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dst->r_info = ELF64_R_INFO((Elf64_Xword)ELF32_R_SYM(src->r_info),
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(Elf64_Xword)ELF32_R_TYPE(src->r_info));
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check_and_copy(GElf_Sxword, dst, src, r_addend, NULL);
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}
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else {
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seterr(ERROR_UNIMPLEMENTED);
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return NULL;
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}
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if (dst == &buf) {
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dst = (GElf_Rela*)malloc(sizeof(GElf_Rela));
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if (!dst) {
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seterr(ERROR_MEM_RELA);
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return NULL;
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}
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*dst = buf;
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}
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return dst;
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}
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int
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gelf_update_rela(Elf_Data *dst, int ndx, GElf_Rela *src) {
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unsigned cls;
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char *tmp;
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tmp = get_addr_and_class(dst, ndx, ELF_T_RELA, &cls);
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if (!tmp) {
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return 0;
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}
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if (cls == ELFCLASS64) {
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*(Elf64_Rela*)tmp = *src;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Rela *dst = (Elf32_Rela*)tmp;
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check_and_copy(Elf32_Addr, dst, src, r_offset, 0);
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if (ELF64_R_SYM(src->r_info) > 0xffffffUL
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|| ELF64_R_TYPE(src->r_info) > 0xffUL) {
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seterr(ERROR_BADVALUE);
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return 0;
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}
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dst->r_info = ELF32_R_INFO((Elf32_Word)ELF64_R_SYM(src->r_info),
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(Elf32_Word)ELF64_R_TYPE(src->r_info));
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check_and_copy(Elf32_Sword, dst, src, r_addend, 0);
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}
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else {
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seterr(ERROR_UNIMPLEMENTED);
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return 0;
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}
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return 1;
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}
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GElf_Rel*
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gelf_getrel(Elf_Data *src, int ndx, GElf_Rel *dst) {
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GElf_Rel buf;
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unsigned cls;
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char *tmp;
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if (!dst) {
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dst = &buf;
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}
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tmp = get_addr_and_class(src, ndx, ELF_T_REL, &cls);
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if (!tmp) {
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return NULL;
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}
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if (cls == ELFCLASS64) {
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*dst = *(Elf64_Rel*)tmp;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Rel *src = (Elf32_Rel*)tmp;
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check_and_copy(GElf_Addr, dst, src, r_offset, NULL);
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dst->r_info = ELF64_R_INFO((Elf64_Xword)ELF32_R_SYM(src->r_info),
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(Elf64_Xword)ELF32_R_TYPE(src->r_info));
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}
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else {
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seterr(ERROR_UNIMPLEMENTED);
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return NULL;
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}
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if (dst == &buf) {
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dst = (GElf_Rel*)malloc(sizeof(GElf_Rel));
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if (!dst) {
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seterr(ERROR_MEM_REL);
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return NULL;
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}
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*dst = buf;
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}
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return dst;
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}
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int
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gelf_update_rel(Elf_Data *dst, int ndx, GElf_Rel *src) {
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unsigned cls;
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char *tmp;
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tmp = get_addr_and_class(dst, ndx, ELF_T_REL, &cls);
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if (!tmp) {
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return 0;
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}
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if (cls == ELFCLASS64) {
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*(Elf64_Rel*)tmp = *src;
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}
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else if (cls == ELFCLASS32) {
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Elf32_Rel *dst = (Elf32_Rel*)tmp;
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check_and_copy(Elf32_Addr, dst, src, r_offset, 0);
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if (ELF64_R_SYM(src->r_info) > 0xffffffUL
|
||
|
|
|| ELF64_R_TYPE(src->r_info) > 0xffUL) {
|
||
|
|
seterr(ERROR_BADVALUE);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
dst->r_info = ELF32_R_INFO((Elf32_Word)ELF64_R_SYM(src->r_info),
|
||
|
|
(Elf32_Word)ELF64_R_TYPE(src->r_info));
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
seterr(ERROR_UNIMPLEMENTED);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if 0
|
||
|
|
|
||
|
|
GElf_Syminfo*
|
||
|
|
gelf_getsyminfo(Elf_Data *src, int ndx, GElf_Syminfo *dst) {
|
||
|
|
seterr(ERROR_UNIMPLEMENTED);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
gelf_update_syminfo(Elf_Data *dst, int ndx, GElf_Syminfo *src) {
|
||
|
|
seterr(ERROR_UNIMPLEMENTED);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
GElf_Move*
|
||
|
|
gelf_getmove(Elf_Data *src, int ndx, GElf_Move *src) {
|
||
|
|
seterr(ERROR_UNIMPLEMENTED);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
gelf_update_move(Elf_Data *dst, int ndx, GElf_Move *src) {
|
||
|
|
seterr(ERROR_UNIMPLEMENTED);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* __LIBELF64 */
|