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/* Transformation functions for ELF data types.
Copyright (C) 1998,1999,2000,2002,2004,2005,2006,2007,2015 Red Hat, Inc.
Copyright (C) 2022 Mark J. Wielaard <mark@klomp.org>
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 1998.
This file is free software; you can redistribute it and/or modify
it under the terms of either
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at
your option) any later version
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at
your option) any later version
or both in parallel, as here.
elfutils 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "libelfP.h"
#ifndef LIBELFBITS
# define LIBELFBITS 32
#endif
/* Well, what shall I say. Nothing to do here. */
#define elf_cvt_Byte(dest, src, n) \
(__builtin_constant_p (n) && (n) == 1 \
? (void) (*((char *) (dest)) = *((char *) (src))) \
: Elf32_cvt_Byte (dest, src, n))
static void
(elf_cvt_Byte) (void *dest, const void *src, size_t n,
int encode __attribute__ ((unused)))
{
if (n != 0)
memmove (dest, src, n);
}
/* We'll optimize the definition of the conversion functions here a
bit. We need only functions for 16, 32, and 64 bits. The
functions referenced in the table will be aliases for one of these
functions. Which one is decided by the ELFxx_FSZ_type. */
#if ALLOW_UNALIGNED
#define FETCH(Bits, ptr) (*(const uint##Bits##_t *) ptr)
#define STORE(Bits, ptr, val) (*(uint##Bits##_t *) ptr = val)
#else
union unaligned
{
uint16_t u16;
uint32_t u32;
uint64_t u64;
} attribute_packed;
#define FETCH(Bits, ptr) (((const union unaligned *) ptr)->u##Bits)
#define STORE(Bits, ptr, val) (((union unaligned *) ptr)->u##Bits = val)
#endif
/* Now define the conversion functions for the basic types. We use here
the fact that file and memory types are the same and that we have the
ELFxx_FSZ_* macros.
At the same time we define inline functions which we will use to
convert the complex types. */
#define FUNDAMENTAL(NAME, Name, Bits) \
INLINE2 (ELFW2(Bits,FSZ_##NAME), ElfW2(Bits,cvt_##Name), ElfW2(Bits,Name))
#define INLINE2(Bytes, FName, TName) \
INLINE3 (Bytes, FName, TName)
#define INLINE3(Bytes, FName, TName) \
static inline void FName##1 (void *dest, const void *ptr) \
{ \
switch (Bytes) \
{ \
case 2: STORE (16, dest, bswap_16 (FETCH (16, ptr))); break; \
case 4: STORE (32, dest, bswap_32 (FETCH (32, ptr))); break; \
case 8: STORE (64, dest, bswap_64 (FETCH (64, ptr))); break; \
default: \
abort (); \
} \
} \
\
static void FName (void *dest, const void *ptr, size_t len, \
int encode __attribute__ ((unused))) \
{ \
size_t n = len / sizeof (TName); \
if (dest < ptr) \
while (n-- > 0) \
{ \
FName##1 (dest, ptr); \
dest += Bytes; \
ptr += Bytes; \
} \
else \
{ \
dest += len; \
ptr += len; \
while (n-- > 0) \
{ \
ptr -= Bytes; \
dest -= Bytes; \
FName##1 (dest, ptr); \
} \
} \
}
/* Now the tricky part: define the transformation functions for the
complex types. We will use the definitions of the types in
abstract.h. */
#define START(Bits, Name, EName) \
static void \
ElfW2 (Bits, cvt_##Name) (void *dest, const void *src, size_t len, \
int encode __attribute__ ((unused))) \
{ ElfW2(Bits, Name) *tdest = (ElfW2(Bits, Name) *) dest; \
ElfW2(Bits, Name) *tsrc = (ElfW2(Bits, Name) *) src; \
size_t sz = sizeof (ElfW2(Bits, Name)); \
size_t n; \
for (n = len / sz; n > 0; ++tdest, ++tsrc, --n) {
#define END(Bits, Name) \
} \
if (len % sz > 0) /* Cannot convert partial structures, just copy. */ \
memmove (dest, src, len % sz); \
}
#define TYPE_EXTRA(Code)
#define TYPE_XLATE(Code) Code
#define TYPE_NAME(Type, Name) TYPE_NAME2 (Type, Name)
#define TYPE_NAME2(Type, Name) Type##1 (&tdest->Name, &tsrc->Name);
#define TYPE(Name, Bits) TYPE2 (Name, Bits)
#define TYPE2(Name, Bits) TYPE3 (Name##Bits)
#define TYPE3(Name) Name (cvt_)
/* Signal that we are generating conversion functions. */
#define GENERATE_CONVERSION
/* First generate the 32-bit conversion functions. */
#define LIBELFBITS 32
#include "gelf_xlate.h"
/* Now generate the 64-bit conversion functions. */
#define LIBELFBITS 64
#include "gelf_xlate.h"
/* We have a few functions which we must create by hand since the sections
do not contain records of only one type. */
#include "version_xlate.h"
#include "gnuhash_xlate.h"
#include "note_xlate.h"
#include "chdr_xlate.h"
/* Now the externally visible table with the function pointers. */
const xfct_t __elf_xfctstom[ELFCLASSNUM - 1][ELF_T_NUM] =
{
[ELFCLASS32 - 1] = {
#define define_xfcts(Bits) \
[ELF_T_BYTE] = elf_cvt_Byte, \
[ELF_T_ADDR] = ElfW2(Bits, cvt_Addr), \
[ELF_T_DYN] = ElfW2(Bits, cvt_Dyn), \
[ELF_T_EHDR] = ElfW2(Bits, cvt_Ehdr), \
[ELF_T_HALF] = ElfW2(Bits, cvt_Half), \
[ELF_T_OFF] = ElfW2(Bits, cvt_Off), \
[ELF_T_PHDR] = ElfW2(Bits, cvt_Phdr), \
[ELF_T_RELA] = ElfW2(Bits, cvt_Rela), \
[ELF_T_REL] = ElfW2(Bits, cvt_Rel), \
[ELF_T_SHDR] = ElfW2(Bits, cvt_Shdr), \
[ELF_T_SWORD] = ElfW2(Bits, cvt_Sword), \
[ELF_T_SYM] = ElfW2(Bits, cvt_Sym), \
[ELF_T_WORD] = ElfW2(Bits, cvt_Word), \
[ELF_T_XWORD] = ElfW2(Bits, cvt_Xword), \
[ELF_T_SXWORD] = ElfW2(Bits, cvt_Sxword), \
[ELF_T_VDEF] = elf_cvt_Verdef, \
[ELF_T_VDAUX] = elf_cvt_Verdef, \
[ELF_T_VNEED] = elf_cvt_Verneed, \
[ELF_T_VNAUX] = elf_cvt_Verneed, \
[ELF_T_NHDR] = elf_cvt_note4, \
[ELF_T_NHDR8] = elf_cvt_note8, \
[ELF_T_SYMINFO] = ElfW2(Bits, cvt_Syminfo), \
[ELF_T_MOVE] = ElfW2(Bits, cvt_Move), \
[ELF_T_LIB] = ElfW2(Bits, cvt_Lib), \
[ELF_T_AUXV] = ElfW2(Bits, cvt_auxv_t), \
[ELF_T_CHDR] = ElfW2(Bits, cvt_chdr), \
[ELF_T_RELR] = ElfW2(Bits, cvt_Relr)
define_xfcts (32),
[ELF_T_GNUHASH] = Elf32_cvt_Word
},
[ELFCLASS64 - 1] = {
define_xfcts (64),
[ELF_T_GNUHASH] = elf_cvt_gnuhash
}
};
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