/*

gelftrans.c - gelf_* translation functions.

Copyright (C) 2000 - 2001 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>

#if __LIBELF64

#ifndef lint

static const char rcsid[] = "@(#) $Id: gelftrans.c,v 1.9 2005/05/21 15:39:23 michael Exp $";

#endif /* lint */

#define check_and_copy(type, d, s, name, eret)		\

    do {						\

	if (sizeof((d)->name) < sizeof((s)->name)	\

	 && (type)(s)->name != (s)->name) {		\

	    seterr(ERROR_BADVALUE);			\

	    return (eret);				\

	}						\

	(d)->name = (type)(s)->name;			\

    } while (0)

/*

 * These macros are missing on some Linux systems

 */

#if !defined(ELF32_R_SYM) || !defined(ELF32_R_TYPE) || !defined(ELF32_R_INFO)

# undef ELF32_R_SYM

# undef ELF32_R_TYPE

# undef ELF32_R_INFO

# define ELF32_R_SYM(i)		((i)>>8)

# define ELF32_R_TYPE(i)	((unsigned char)(i))

# define ELF32_R_INFO(s,t)	(((s)<<8)+(unsigned char)(t))

#endif /* !defined(...) */

#if !defined(ELF64_R_SYM) || !defined(ELF64_R_TYPE) || !defined(ELF64_R_INFO)

# undef ELF64_R_SYM

# undef ELF64_R_TYPE

# undef ELF64_R_INFO

# define ELF64_R_SYM(i)		((i)>>32)

# define ELF64_R_TYPE(i)	((i)&0xffffffffL)

# define ELF64_R_INFO(s,t)	(((Elf64_Xword)(s)<<32)+((t)&0xffffffffL))

#endif /* !defined(...) */

static char*

get_addr_and_class(const Elf_Data *data, int ndx, Elf_Type type, unsigned *cls) {

    Scn_Data *sd = (Scn_Data*)data;

    Elf_Scn *scn;

    Elf *elf;

    size_t n;

    if (!sd) {

	return NULL;

    }

    elf_assert(sd->sd_magic == DATA_MAGIC);

    scn = sd->sd_scn;

    elf_assert(scn);

    elf_assert(scn->s_magic == SCN_MAGIC);

    elf = scn->s_elf;

    elf_assert(elf);

    elf_assert(elf->e_magic == ELF_MAGIC);

    if (elf->e_kind != ELF_K_ELF) {

	seterr(ERROR_NOTELF);

	return NULL;

    }

    if (!valid_class(elf->e_class)) {

	seterr(ERROR_UNKNOWN_CLASS);

	return NULL;

    }

    if (data->d_type != type) {

	seterr(ERROR_BADTYPE);

	return NULL;

    }

    n = _msize(elf->e_class, data->d_version, type);

    if (n == 0) {

	seterr(ERROR_UNIMPLEMENTED);

	return NULL;

    }

    if (ndx < 0 || data->d_size < (ndx + 1) * n) {

	seterr(ERROR_BADINDEX);

	return NULL;

    }

    if (!data->d_buf) {

	seterr(ERROR_NULLBUF);

	return NULL;

    }

    if (cls) {

	*cls = elf->e_class;

    }

    return (char*)data->d_buf + n * ndx;

}

GElf_Sym*

gelf_getsym(Elf_Data *src, int ndx, GElf_Sym *dst) {

    GElf_Sym buf;

    unsigned cls;

    char *tmp;

    if (!dst) {

	dst = &buf;

    }

    tmp = get_addr_and_class(src, ndx, ELF_T_SYM, &cls);

    if (!tmp) {

	return NULL;

    }

    if (cls == ELFCLASS64) {

	*dst = *(Elf64_Sym*)tmp;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Sym *src = (Elf32_Sym*)tmp;

	check_and_copy(GElf_Word,     dst, src, st_name,  NULL);

	check_and_copy(unsigned char, dst, src, st_info,  NULL);

	check_and_copy(unsigned char, dst, src, st_other, NULL);

	check_and_copy(GElf_Half,     dst, src, st_shndx, NULL);

	check_and_copy(GElf_Addr,     dst, src, st_value, NULL);

	check_and_copy(GElf_Xword,    dst, src, st_size,  NULL);

    }

    else {

	seterr(ERROR_UNIMPLEMENTED);

	return NULL;

    }

    if (dst == &buf) {

	dst = (GElf_Sym*)malloc(sizeof(GElf_Sym));

	if (!dst) {

	    seterr(ERROR_MEM_SYM);

	    return NULL;

	}

	*dst = buf;

    }

    return dst;

}

int

gelf_update_sym(Elf_Data *dst, int ndx, GElf_Sym *src) {

    unsigned cls;

    char *tmp;

    tmp = get_addr_and_class(dst, ndx, ELF_T_SYM, &cls);

    if (!tmp) {

	return 0;

    }

    if (cls == ELFCLASS64) {

	*(Elf64_Sym*)tmp = *src;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Sym *dst = (Elf32_Sym*)tmp;

	check_and_copy(Elf32_Word,    dst, src, st_name,  0);

	check_and_copy(Elf32_Addr,    dst, src, st_value, 0);

	check_and_copy(Elf32_Word,    dst, src, st_size,  0);

	check_and_copy(unsigned char, dst, src, st_info,  0);

	check_and_copy(unsigned char, dst, src, st_other, 0);

	check_and_copy(Elf32_Half,    dst, src, st_shndx, 0);

    }

    else {

	seterr(ERROR_UNIMPLEMENTED);

	return 0;

    }

    return 1;

}

GElf_Dyn*

gelf_getdyn(Elf_Data *src, int ndx, GElf_Dyn *dst) {

    GElf_Dyn buf;

    unsigned cls;

    char *tmp;

    if (!dst) {

	dst = &buf;

    }

    tmp = get_addr_and_class(src, ndx, ELF_T_DYN, &cls);

    if (!tmp) {

	return NULL;

    }

    if (cls == ELFCLASS64) {

	*dst = *(Elf64_Dyn*)tmp;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Dyn *src = (Elf32_Dyn*)tmp;

	check_and_copy(GElf_Sxword, dst, src, d_tag,      NULL);

	check_and_copy(GElf_Xword,  dst, src, d_un.d_val, NULL);

    }

    else {

	seterr(ERROR_UNIMPLEMENTED);

	return NULL;

    }

    if (dst == &buf) {

	dst = (GElf_Dyn*)malloc(sizeof(GElf_Dyn));

	if (!dst) {

	    seterr(ERROR_MEM_DYN);

	    return NULL;

	}

	*dst = buf;

    }

    return dst;

}

int

gelf_update_dyn(Elf_Data *dst, int ndx, GElf_Dyn *src) {

    unsigned cls;

    char *tmp;

    tmp = get_addr_and_class(dst, ndx, ELF_T_DYN, &cls);

    if (!tmp) {

	return 0;

    }

    if (cls == ELFCLASS64) {

	*(Elf64_Dyn*)tmp = *src;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Dyn *dst = (Elf32_Dyn*)tmp;

	check_and_copy(Elf32_Sword, dst, src, d_tag,      0);

	check_and_copy(Elf32_Word,  dst, src, d_un.d_val, 0);

    }

    else {

	seterr(ERROR_UNIMPLEMENTED);

	return 0;

    }

    return 1;

}

GElf_Rela*

gelf_getrela(Elf_Data *src, int ndx, GElf_Rela *dst) {

    GElf_Rela buf;

    unsigned cls;

    char *tmp;

    if (!dst) {

	dst = &buf;

    }

    tmp = get_addr_and_class(src, ndx, ELF_T_RELA, &cls);

    if (!tmp) {

	return NULL;

    }

    if (cls == ELFCLASS64) {

	*dst = *(Elf64_Rela*)tmp;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Rela *src = (Elf32_Rela*)tmp;

	check_and_copy(GElf_Addr,   dst, src, r_offset, NULL);

	dst->r_info = ELF64_R_INFO((Elf64_Xword)ELF32_R_SYM(src->r_info),

				   (Elf64_Xword)ELF32_R_TYPE(src->r_info));

	check_and_copy(GElf_Sxword, dst, src, r_addend, NULL);

    }

    else {

	seterr(ERROR_UNIMPLEMENTED);

	return NULL;

    }

    if (dst == &buf) {

	dst = (GElf_Rela*)malloc(sizeof(GElf_Rela));

	if (!dst) {

	    seterr(ERROR_MEM_RELA);

	    return NULL;

	}

	*dst = buf;

    }

    return dst;

}

int

gelf_update_rela(Elf_Data *dst, int ndx, GElf_Rela *src) {

    unsigned cls;

    char *tmp;

    tmp = get_addr_and_class(dst, ndx, ELF_T_RELA, &cls);

    if (!tmp) {

	return 0;

    }

    if (cls == ELFCLASS64) {

	*(Elf64_Rela*)tmp = *src;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Rela *dst = (Elf32_Rela*)tmp;

	check_and_copy(Elf32_Addr,  dst, src, r_offset, 0);

	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));

	check_and_copy(Elf32_Sword, dst, src, r_addend, 0);

    }

    else {

	seterr(ERROR_UNIMPLEMENTED);

	return 0;

    }

    return 1;

}

GElf_Rel*

gelf_getrel(Elf_Data *src, int ndx, GElf_Rel *dst) {

    GElf_Rel buf;

    unsigned cls;

    char *tmp;

    if (!dst) {

	dst = &buf;

    }

    tmp = get_addr_and_class(src, ndx, ELF_T_REL, &cls);

    if (!tmp) {

	return NULL;

    }

    if (cls == ELFCLASS64) {

	*dst = *(Elf64_Rel*)tmp;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Rel *src = (Elf32_Rel*)tmp;

	check_and_copy(GElf_Addr, dst, src, r_offset, NULL);

	dst->r_info = ELF64_R_INFO((Elf64_Xword)ELF32_R_SYM(src->r_info),

				   (Elf64_Xword)ELF32_R_TYPE(src->r_info));

    }

    else {

	seterr(ERROR_UNIMPLEMENTED);

	return NULL;

    }

    if (dst == &buf) {

	dst = (GElf_Rel*)malloc(sizeof(GElf_Rel));

	if (!dst) {

	    seterr(ERROR_MEM_REL);

	    return NULL;

	}

	*dst = buf;

    }

    return dst;

}

int

gelf_update_rel(Elf_Data *dst, int ndx, GElf_Rel *src) {

    unsigned cls;

    char *tmp;

    tmp = get_addr_and_class(dst, ndx, ELF_T_REL, &cls);

    if (!tmp) {

	return 0;

    }

    if (cls == ELFCLASS64) {

	*(Elf64_Rel*)tmp = *src;

    }

    else if (cls == ELFCLASS32) {

	Elf32_Rel *dst = (Elf32_Rel*)tmp;

	check_and_copy(Elf32_Addr, dst, src, r_offset, 0);

	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 */