/* 32.xlatetof.c - implementation of the elf32_xlateto[fm](3) functions. Copyright (C) 1995 - 2002 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 #include #include #ifndef lint static const char rcsid[] = "@(#) Id: 32.xlatetof.c,v 1.14 2002/06/11 18:53:22 michael Exp "; #endif /* lint */ /* * Ugly, ugly */ #if defined(__LCLINT__) # 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 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 #endif #undef x /* * 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) \ /*@-mustmod@*/ \ static size_t \ Cat3(name,_,io)(unsigned char *dst, const unsigned char *src, size_t n) \ /*@modifies *dst @*/ \ { \ 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); \ } \ /*@=mustmod@*/ #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), \ /**/)) #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), \ /**/)))))))))))))) #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), \ /**/)))))))) #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), \ /**/))) #define copy_rel_11(e,io,seq) \ seq(copy_addr(e,io,r_offset), \ seq(copy_word(e,io,r_info), \ /**/)) #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), \ /**/)))))))))) #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), \ /**/)))))) /*@-boundswrite@*/ /* FIX: memmove precondition? */ static size_t byte_copy(unsigned char *dst, const unsigned char *src, size_t n) /*@modifies *dst @*/ { 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) /*@modifies *dst @*/ { (void) 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) /*@=boundswrite@*/ typedef size_t (*xlator)(unsigned char* dst, const unsigned char* src, size_t n) /*@modifies *dst @*/; typedef xlator xltab[ELF_T_NUM][2]; /* * translation table (32-bit, version 1 -> version 1) */ /*@-initsize -nullassign @*/ /*@unchecked@*/ /*@observer@*/ #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 }, { NULL, NULL }, /* there is no Sxword */ { NULL, NULL }, /* 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 */ { NULL, NULL }, { NULL, NULL }, #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 }, { NULL, NULL }, /* there is no Sxword */ { NULL, NULL }, /* 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 */ { NULL, NULL }, { NULL, NULL }, #endif /* __LIBELF_SYMBOL_VERSIONS */ }, }; /*@=initsize =nullassign @*/ /* * main translation table (32-bit) */ /*@unchecked@*/ /*@observer@*/ #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; } /*@-boundsread@*/ 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); /*@=boundsread@*/ } /* * direction-independent translation */ /*@null@*/ static Elf_Data* elf32_xlate(/*@returned@*/ Elf_Data *dst, const Elf_Data *src, unsigned encode, int tof) /*@modifies *dst @*/ { 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; } /*@-boundsread@*/ 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 (dst->d_size < dsize) { seterr(ERROR_DST2SMALL); return NULL; } if (dsize) { tmp = (*op)(dst->d_buf, src->d_buf, src->d_size); elf_assert(tmp == dsize); } /*@=boundsread@*/ 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); }