NAME¶

gelf_xlatetom - Translate class-independent ELF data from file representation to memory representation

gelf_xlatetof - Translate class-independent ELF data from memory representation to file representation

SYNOPSIS¶

#include <gelf.h>
Elf_Data gelf_xlatetom (Elf *elf, Elf_Data *dest, const Elf_Data *src, unsigned int encode);
Elf_Data gelf_xlatetof (Elf *elf, Elf_Data *dest, const Elf_Data *src, unsigned int encode);

DESCRIPTION¶

Translate ELF data from file representation to memory representation or vice versa. File and memory representations of ELF data can differ in terms of endianness. gelf_xlatetom() acts as a wrapper around elf32_xlatetom() and elf64_xlatetom(). gelf_xlatetof() acts as a wrapper around elf32_xlatetof() and elf64_xlatetof(). The binary class (ELFCLASS32 or ELFCLASS64) of elf is used to automatically select between the elf32 and elf64 version of each function.

Data in file representation normally comes from elf_rawdata while data in memory representation normally comes from elf_getdata. When there is no difference between file and memory representations, these functions simply copy the ELF data from src to dest. Otherwise the encoding will swap between ELFDATA2LSB (two's complement little-endian) and ELFDATA2MSB (two's complement big-endian). The encoding of an ELF file is specified in the Elf32_Ehdr or Elf64_Ehdr e_ident[EI_DATA] member. To know the memory encoding for a program you can #include <endian.h> and check BYTE_ORDER == LITTLE_ENDIAN (corresponding to ELFDATA2LSB) or BYTE_ORDER == BIG_ENDIAN (corresponding to ELFDATA2MSB).

PARAMETERS¶

elf

The ELF descriptor that determines the binary class (ELFCLASS32 or ELFCLASS64) used to translate between file and memory representation.

dest

Destination where the translated data will be stored. The d_size of dest should be at least as big as the d_size of src.

src

Source data. For the xlatetom functions, the source data should be in file representation. For the xlatetof functions, the source data should be in memory representation.

encode

Specifies an encoding. Can be either ELFDATA2LSB (two's complement little-endian) or ELFDATA2MSB (two's complement big-endian). For the xlatetom functions, this specifies the encoding of src. For the xlatetof functions, this specifies the encoding of dest.

RETURN VALUE¶

On success, return dest, which will contain the translated data. If there is no difference between the file and memory representations, dest will contain a copy of the source data. The d_type and d_size of dest will be set to those of src.

On failure, return NULL and set elf_errno. If elf, src or dest is NULL, then NULL is returned without setting elf_errno.

SEE ALSO¶

elf32_xlatetof(3), elf32_xlatetom(3), elf64_xlatetof(3), elf64_xlatetom(3), elf_getdata(3), elf_rawdata(3), libelf(3), elf(5)

ATTRIBUTES¶

REPORTING BUGS¶

Report bugs to <elfutils-devel@sourceware.org> or https://sourceware.org/bugzilla/.