ELFXLATE(3E) ELFXLATE(3E)
NAME
elfxlate: elf32xlatetof, elf32xlatetom,elf64xlatetof, elf64xlatetom
- class-dependent data translation
SYNOPSIS
cc [flag ...] file ... -lelf [library ...]
#include <libelf.h>
ElfData *elf32xlatetof(ElfData *dst, const ElfData *src,
unsigned encode);
ElfData *elf32xlatetom(ElfData *dst, const ElfData *src,
unsigned encode);
ElfData *elf64xlatetof(ElfData *dst, const ElfData *src,
unsigned encode);
ElfData *elf64xlatetom(ElfData *dst, const ElfData *src,
unsigned encode);
DESCRIPTION
elf32xlatetom translates various data structures from their 32-bit class
file representations to their memory representations; elf32xlatetof
provides the inverse. This conversion is particularly important for
cross development environments. src is a pointer to the source buffer
that holds the original data; dst is a pointer to a destination buffer
that will hold the translated copy. encode gives the byte encoding in
which the file objects are (to be) represented and must have one of the
encoding values defined for the ELF header's eident[EIDATA] entry [see
elfgetident(3E)]. If the data can be translated, the functions return
dst. Otherwise, they return null because an error occurred, such as
incompatible types, destination buffer overflow, etc.
elfgetdata(3E) describes the ElfData descriptor, which the translation
routines use as follows.
dbuf Both the source and destination must have valid buffer
pointers.
dtype This member's value specifies the type of the data to which
dbuf points and the type of data to be created in the
destination. The program supplies a dtype value in the
source; the library sets the destination's dtype to the
same value. These values are summarized below.
dsize This member holds the total size, in bytes, of the memory
occupied by the source data and the size allocated for the
destination data. If the destination buffer is not large
enough, the routines do not change its original contents.
The translation routines reset the destination's dsize
member to the actual size required, after the translation
occurs. The source and destination sizes may differ.
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ELFXLATE(3E) ELFXLATE(3E)
dversion This member holds version number of the objects (desired)
in the buffer. The source and destination versions are
independent.
Translation routines allow the source and destination buffers to
coincide. That is, dst->dbuf may equal src->dbuf. Other cases where
the source and destination buffers overlap give undefined behavior.
ElfType 32-Bit Memory Type
________________________________
|
ELFTADDR Elf32Addr
|
ELFTBYTE unsigned char
|
ELFTDYN Elf32Dyn
|
ELFTEHDR Elf32Ehdr
|
ELFTHALF Elf32Half
|
ELTTOFF Elf32Off
|
ELFTPHDR Elf32Phdr
|
ELFTREL Elf32Rel
|
ELFTRELA Elf32Rela
|
ELFTSHDR Elf32Shdr
|
ELFTSWORD Elf32Sword
|
ELFTSYM Elf32Sym
|
ELFTWORD Elf32Word
|
____________|___________________
``Translating'' buffers of type ELFTBYTE does not change the byte
order.
The 64-bit class works identically, simply replacing all instances of 32
in the description and table with 64.
SEE ALSO
elf(3E), elffsize(3E), elfgetdata(3E), elfgetident(3E).
CAVEAT
By default, the Elf_Data used for the 64-bit class in a 32-bit
application restricts one to building 64-bit class applications with only
32-bit fields unless the entire application is compiled with
_LIBELF_XTND_64 defined (see elf.3e).
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