elf_xlate(3E) elf_xlate(3E)
NAME
elf32_xlatetof, elf32_xlatetom, elf64_xlatetof, elf64_xlatetom -
class-dependent data translation for elf32 and elf64 files,
respectively
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;
elf64_xlatetom translates various data structures from their 64-bit
class file representations to their memory representations;
elf32_xlatetof and elf64_xlatetof provide 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(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, and so forth.
elf_getdata(3E) 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
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elf_xlate(3E) elf_xlate(3E)
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 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.
For elf32 files:
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
For elf64 files:
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elf_xlate(3E) elf_xlate(3E)
Elf_Type 64-Bit Memory Type
________________________________
ELF_T_ADDR Elf64_Addr
ELF_T_BYTE unsigned char
ELF_T_DYN Elf64_Dyn
ELF_T_EHDR Elf64_Ehdr
ELF_T_HALF Elf64_Half
ELT_T_OFF Elf64_Off
ELF_T_PHDR Elf64_Phdr
ELF_T_REL Elf64_Rel
ELF_T_RELA Elf64_Rela
ELF_T_SHDR Elf64_Shdr
ELF_T_SWORD Elf64_Sword
ELF_T_SYM Elf64_Sym
ELF_T_WORD Elf64_Word
``Translating'' buffers of type ELF_T_BYTE does not change the byte
order.
SEE ALSO
elf(3E), elf_fsize(3E), elf_getdata(3E), elf_getident(3E).
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