ELF32_XLATETOF(3ELF) ELF Library Functions ELF32_XLATETOF(3ELF)


NAME


elf32_xlatetof, elf32_xlatetom, elf64_xlatetof, elf64_xlatetom - class-
dependent data translation

SYNOPSIS


cc [ flag ... ] file... -lelf [ library ... ]
#include <libelf.h>

Elf_Data *elf32_xlatetof(Elf_Data *dst, const Elf_Data *src,
unsigned encode);


Elf_Data *elf32_xlatetom(Elf_Data *dst, const Elf_Data *src,
unsigned encode);


Elf_Data *elf64_xlatetof(Elf_Data *dst, const Elf_Data *src,
unsigned encode);


Elf_Data *elf64_xlatetom(Elf_Data *dst, const Elf_Data *src,
unsigned encode);


DESCRIPTION


elf32_xlatetom() translates various data structures from their 32-bit
class file representations to their memory representations;
elf32_xlatetof() 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
e_ident[EI_DATA] entry (see elf_getident(3ELF)). 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.


elf_getdata(3ELF) describes the Elf_Data descriptor, which the
translation routines use as follows:

d_buf
Both the source and destination must have valid buffer
pointers.


d_type
This member's value specifies the type of the data to which
d_buf points and the type of data to be created in the
destination. The program supplies a d_type value in the
source; the library sets the destination's d_type to the
same value. These values are summarized below.


d_size
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 d_size
member to the actual size required, after the translation
occurs. The source and destination sizes may differ.


d_version
This member holds the 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->d_buf may equal src->d_buf. Other cases where the
source and destination buffers overlap give undefined behavior.

Elf_Type 32-Bit Memory Type
ELF_T_ADDR Elf32_Addr
ELF_T_BYTE unsigned char
ELF_T_DYN Elf32_Dyn
ELF_T_EHDR Elf32_Ehdr
ELF_T_HALF Elf32_Half
ELT_T_OFF Elf32_Off
ELF_T_PHDR Elf32_Phdr
ELF_T_REL Elf32_Rel
ELF_T_RELA Elf32_Rela
ELF_T_SHDR Elf32_Shdr
ELF_T_SWORD Elf32_Sword
ELF_T_SYM Elf32_Sym
ELF_T_WORD Elf32_Word


Translating buffers of type ELF_T_BYTE does not change the byte order.


For the 64-bit class, replace 32 with 64 as appropriate.

ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Stable |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO


elf(3ELF), elf32_fsize(3ELF), elf_getdata(3ELF), elf_getident(3ELF),
libelf(3LIB), attributes(5)


July 11, 2001 ELF32_XLATETOF(3ELF)