/*

 * 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);

}