/*
* 32.xlatetof.c - implementation of the elf32_xlateto[fm](3) functions.
* 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>
#include <ext_types.h>
#include <byteswap.h>
#ifndef lint
static const char rcsid[] = "@(#) $Id: 32.xlatetof.c,v 1.26 2006/07/27 22:33:40 michael Exp $";
#endif /* lint */
/*
* Ugly, ugly
*/
#ifdef _WIN32
# define Cat2(a,b)a##b
# define Cat3(a,b,c)a##b##c
# define Ex1(m1,m2,a,b)m1##m2(a##b)
# define Ex2(m1,m2,a,b,c)m1##m2(a,b##c)
#else /* _WIN32 */
# define x
# if defined/**/x
# define Cat2(a,b)a##b
# define Cat3(a,b,c)a##b##c
# define Ex1(m1,m2,a,b)m1##m2(a##b)
# define Ex2(m1,m2,a,b,c)m1##m2(a,b##c)
# else
# define Cat2(a,b)a/**/b
# define Cat3(a,b,c)a/**/b/**/c
# define Ex1(m1,m2,a,b)m1/**/m2(a/**/b)
# define Ex2(m1,m2,a,b,c)m1/**/m2(a,b/**/c)
# endif
# undef x
#endif /* _WIN32 */
/*
* auxiliary macros for execution order reversal
*/
#define seq_forw(a,b) a b
#define seq_back(a,b) b a
/*
* function instantiator
*/
#define copy_type_e_io(name,e,io,tfrom,tto,copy) \
static size_t \
Cat3(name,_,io)(unsigned char *dst, const unsigned char *src, size_t n) { \
n /= sizeof(tfrom); \
if (n && dst) { \
const tfrom *from = (const tfrom*)src; \
tto *to = (tto*)dst; \
size_t i; \
\
if (sizeof(tfrom) < sizeof(tto)) { \
from += n; \
to += n; \
for (i = 0; i < n; i++) { \
--from; \
--to; \
copy(e,io,seq_back) \
} \
} \
else { \
for (i = 0; i < n; i++) { \
copy(e,io,seq_forw) \
from++; \
to++; \
} \
} \
} \
return n * sizeof(tto); \
}
#define copy_type_e(name,e,type,copy) \
copy_type_e_io(name,e,tom,Cat2(__ext_,type),type,copy) \
copy_type_e_io(name,e,tof,type,Cat2(__ext_,type),copy)
/*
* master function instantiator
*/
#define copy_type(name,version,type,copy) \
copy_type_e(Cat3(name,L,version),L,type,copy) \
copy_type_e(Cat3(name,M,version),M,type,copy)
/*
* scalar copying
*/
#define copy_scalar_tom(type) *to = Cat2(__load_,type)(*from);
#define copy_scalar_tof(type) Cat2(__store_,type)(*to, *from);
/*
* structure member copying
*/
#define copy_tom(mb,type) to->mb = Cat2(__load_,type)(from->mb);
#define copy_tof(mb,type) Cat2(__store_,type)(to->mb, from->mb);
/*
* structure member copying (direction independent)
*/
#define copy_byte(e,io,mb) to->mb = from->mb;
#define copy_addr(e,io,mb) Ex2(copy_,io,mb,u32,e)
#define copy_half(e,io,mb) Ex2(copy_,io,mb,u16,e)
#define copy_off(e,io,mb) Ex2(copy_,io,mb,u32,e)
#define copy_sword(e,io,mb) Ex2(copy_,io,mb,i32,e)
#define copy_word(e,io,mb) Ex2(copy_,io,mb,u32,e)
#define copy_arr(e,io,mb) \
array_copy(to->mb, sizeof(to->mb), from->mb, sizeof(from->mb));
/*
* scalar copying (direction independent)
* these macros are used as `copy' arguments to copy_type()
*/
#define copy_addr_11(e,io,seq) Ex1(copy_scalar_,io,u32,e)
#define copy_half_11(e,io,seq) Ex1(copy_scalar_,io,u16,e)
#define copy_off_11(e,io,seq) Ex1(copy_scalar_,io,u32,e)
#define copy_sword_11(e,io,seq) Ex1(copy_scalar_,io,i32,e)
#define copy_word_11(e,io,seq) Ex1(copy_scalar_,io,u32,e)
/*
* structure copying (direction independent)
* these macros are used as `copy' arguments to copy_type()
*/
#define copy_dyn_11(e,io,seq) \
seq(copy_sword(e,io,d_tag), \
seq(copy_addr(e,io,d_un.d_ptr), \
nullcopy))
#define copy_ehdr_11(e,io,seq) \
seq(copy_arr(e,io,e_ident), \
seq(copy_half(e,io,e_type), \
seq(copy_half(e,io,e_machine), \
seq(copy_word(e,io,e_version), \
seq(copy_addr(e,io,e_entry), \
seq(copy_off(e,io,e_phoff), \
seq(copy_off(e,io,e_shoff), \
seq(copy_word(e,io,e_flags), \
seq(copy_half(e,io,e_ehsize), \
seq(copy_half(e,io,e_phentsize), \
seq(copy_half(e,io,e_phnum), \
seq(copy_half(e,io,e_shentsize), \
seq(copy_half(e,io,e_shnum), \
seq(copy_half(e,io,e_shstrndx), \
nullcopy))))))))))))))
#define copy_phdr_11(e,io,seq) \
seq(copy_word(e,io,p_type), \
seq(copy_off(e,io,p_offset), \
seq(copy_addr(e,io,p_vaddr), \
seq(copy_addr(e,io,p_paddr), \
seq(copy_word(e,io,p_filesz), \
seq(copy_word(e,io,p_memsz), \
seq(copy_word(e,io,p_flags), \
seq(copy_word(e,io,p_align), \
nullcopy))))))))
#define copy_rela_11(e,io,seq) \
seq(copy_addr(e,io,r_offset), \
seq(copy_word(e,io,r_info), \
seq(copy_sword(e,io,r_addend), \
nullcopy)))
#define copy_rel_11(e,io,seq) \
seq(copy_addr(e,io,r_offset), \
seq(copy_word(e,io,r_info), \
nullcopy))
#define copy_shdr_11(e,io,seq) \
seq(copy_word(e,io,sh_name), \
seq(copy_word(e,io,sh_type), \
seq(copy_word(e,io,sh_flags), \
seq(copy_addr(e,io,sh_addr), \
seq(copy_off(e,io,sh_offset), \
seq(copy_word(e,io,sh_size), \
seq(copy_word(e,io,sh_link), \
seq(copy_word(e,io,sh_info), \
seq(copy_word(e,io,sh_addralign), \
seq(copy_word(e,io,sh_entsize), \
nullcopy))))))))))
#define copy_sym_11(e,io,seq) \
seq(copy_word(e,io,st_name), \
seq(copy_addr(e,io,st_value), \
seq(copy_word(e,io,st_size), \
seq(copy_byte(e,io,st_info), \
seq(copy_byte(e,io,st_other), \
seq(copy_half(e,io,st_shndx), \
nullcopy))))))
#define nullcopy /**/
static size_t
byte_copy(unsigned char *dst, const unsigned char *src, size_t n) {
if (n && dst && dst != src) {
#if HAVE_BROKEN_MEMMOVE
size_t i;
if (dst >= src + n || dst + n <= src) {
memcpy(dst, src, n);
}
else if (dst < src) {
for (i = 0; i < n; i++) {
dst[i] = src[i];
}
}
else {
for (i = n; --i; ) {
dst[i] = src[i];
}
}
#else /* HAVE_BROKEN_MEMMOVE */
memmove(dst, src, n);
#endif /* HAVE_BROKEN_MEMMOVE */
}
return n;
}
static void
array_copy(unsigned char *dst, size_t dlen, const unsigned char *src, size_t slen) {
byte_copy(dst, src, dlen < slen ? dlen : slen);
if (dlen > slen) {
memset(dst + slen, 0, dlen - slen);
}
}
/*
* instantiate copy functions
*/
copy_type(addr_32,_,Elf32_Addr,copy_addr_11)
copy_type(half_32,_,Elf32_Half,copy_half_11)
copy_type(off_32,_,Elf32_Off,copy_off_11)
copy_type(sword_32,_,Elf32_Sword,copy_sword_11)
copy_type(word_32,_,Elf32_Word,copy_word_11)
copy_type(dyn_32,11,Elf32_Dyn,copy_dyn_11)
copy_type(ehdr_32,11,Elf32_Ehdr,copy_ehdr_11)
copy_type(phdr_32,11,Elf32_Phdr,copy_phdr_11)
copy_type(rela_32,11,Elf32_Rela,copy_rela_11)
copy_type(rel_32,11,Elf32_Rel,copy_rel_11)
copy_type(shdr_32,11,Elf32_Shdr,copy_shdr_11)
copy_type(sym_32,11,Elf32_Sym,copy_sym_11)
typedef size_t (*xlator)(unsigned char*, const unsigned char*, size_t);
typedef xlator xltab[ELF_T_NUM][2];
/*
* translation table (32-bit, version 1 -> version 1)
*/
#if PIC
static xltab
#else /* PIC */
static const xltab
#endif /* PIC */
xlate32_11[/*encoding*/] = {
{
{ byte_copy, byte_copy },
{ addr_32L__tom, addr_32L__tof },
{ dyn_32L11_tom, dyn_32L11_tof },
{ ehdr_32L11_tom, ehdr_32L11_tof },
{ half_32L__tom, half_32L__tof },
{ off_32L__tom, off_32L__tof },
{ phdr_32L11_tom, phdr_32L11_tof },
{ rela_32L11_tom, rela_32L11_tof },
{ rel_32L11_tom, rel_32L11_tof },
{ shdr_32L11_tom, shdr_32L11_tof },
{ sword_32L__tom, sword_32L__tof },
{ sym_32L11_tom, sym_32L11_tof },
{ word_32L__tom, word_32L__tof },
{ 0, 0 }, /* there is no Sxword */
{ 0, 0 }, /* there is no Xword */
#if __LIBELF_SYMBOL_VERSIONS
{ _elf_verdef_32L11_tom, _elf_verdef_32L11_tof },
{ _elf_verneed_32L11_tom, _elf_verneed_32L11_tof },
#else /* __LIBELF_SYMBOL_VERSIONS */
{ 0, 0 },
{ 0, 0 },
#endif /* __LIBELF_SYMBOL_VERSIONS */
},
{
{ byte_copy, byte_copy },
{ addr_32M__tom, addr_32M__tof },
{ dyn_32M11_tom, dyn_32M11_tof },
{ ehdr_32M11_tom, ehdr_32M11_tof },
{ half_32M__tom, half_32M__tof },
{ off_32M__tom, off_32M__tof },
{ phdr_32M11_tom, phdr_32M11_tof },
{ rela_32M11_tom, rela_32M11_tof },
{ rel_32M11_tom, rel_32M11_tof },
{ shdr_32M11_tom, shdr_32M11_tof },
{ sword_32M__tom, sword_32M__tof },
{ sym_32M11_tom, sym_32M11_tof },
{ word_32M__tom, word_32M__tof },
{ 0, 0 }, /* there is no Sxword */
{ 0, 0 }, /* there is no Xword */
#if __LIBELF_SYMBOL_VERSIONS
{ _elf_verdef_32M11_tom, _elf_verdef_32M11_tof },
{ _elf_verneed_32M11_tom, _elf_verneed_32M11_tof },
#else /* __LIBELF_SYMBOL_VERSIONS */
{ 0, 0 },
{ 0, 0 },
#endif /* __LIBELF_SYMBOL_VERSIONS */
},
};
/*
* main translation table (32-bit)
*/
#if PIC
static xltab*
#else /* PIC */
static const xltab *const
#endif /* PIC */
xlate32[EV_CURRENT - EV_NONE][EV_CURRENT - EV_NONE] = {
{ xlate32_11, },
};
#define translator(sv,dv,enc,type,d) \
(xlate32[(sv) - EV_NONE - 1] \
[(dv) - EV_NONE - 1] \
[(enc) - ELFDATA2LSB] \
[(type) - ELF_T_BYTE] \
[d])
/*
* destination buffer size
*/
size_t
_elf32_xltsize(const Elf_Data *src, unsigned dv, unsigned encode, int tof) {
Elf_Type type = src->d_type;
unsigned sv = src->d_version;
xlator op;
if (!valid_version(sv) || !valid_version(dv)) {
seterr(ERROR_UNKNOWN_VERSION);
return (size_t)-1;
}
if (tof) {
/*
* Encoding doesn't really matter (the translator only looks at
* the source, which resides in memory), but we need a proper
* encoding to select a translator...
*/
encode = ELFDATA2LSB;
}
else if (!valid_encoding(encode)) {
seterr(ERROR_UNKNOWN_ENCODING);
return (size_t)-1;
}
if (!valid_type(type)) {
seterr(ERROR_UNKNOWN_TYPE);
return (size_t)-1;
}
if (!(op = translator(sv, dv, encode, type, tof))) {
seterr(ERROR_UNKNOWN_TYPE);
return (size_t)-1;
}
return (*op)(NULL, src->d_buf, src->d_size);
}
/*
* direction-independent translation
*/
static Elf_Data*
elf32_xlate(Elf_Data *dst, const Elf_Data *src, unsigned encode, int tof) {
Elf_Type type;
int dv;
int sv;
size_t dsize;
size_t tmp;
xlator op;
if (!src || !dst) {
return NULL;
}
if (!src->d_buf || !dst->d_buf) {
seterr(ERROR_NULLBUF);
return NULL;
}
if (!valid_encoding(encode)) {
seterr(ERROR_UNKNOWN_ENCODING);
return NULL;
}
sv = src->d_version;
dv = dst->d_version;
if (!valid_version(sv) || !valid_version(dv)) {
seterr(ERROR_UNKNOWN_VERSION);
return NULL;
}
type = src->d_type;
if (!valid_type(type)) {
seterr(ERROR_UNKNOWN_TYPE);
return NULL;
}
op = translator(sv, dv, encode, type, tof);
if (!op) {
seterr(ERROR_UNKNOWN_TYPE);
return NULL;
}
dsize = (*op)(NULL, src->d_buf, src->d_size);
if (dsize == (size_t)-1) {
return NULL;
}
if (dst->d_size < dsize) {
seterr(ERROR_DST2SMALL);
return NULL;
}
if (dsize) {
tmp = (*op)(dst->d_buf, src->d_buf, src->d_size);
if (tmp == (size_t)-1) {
return NULL;
}
elf_assert(tmp == dsize);
}
dst->d_size = dsize;
dst->d_type = type;
return dst;
}
/*
* finally, the "official" translation functions
*/
Elf_Data*
elf32_xlatetom(Elf_Data *dst, const Elf_Data *src, unsigned encode) {
return elf32_xlate(dst, src, encode, 0);
}
Elf_Data*
elf32_xlatetof(Elf_Data *dst, const Elf_Data *src, unsigned encode) {
return elf32_xlate(dst, src, encode, 1);
}