elf_xlate(3E) elf_xlate(3E)
NAME
elf_xlate: elf32_xlatetof, elf32_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);
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(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
destination buffer is not large enough, the
routines do not change its original contents.
Copyright 1994 Novell, Inc. Page 1
elf_xlate(3E) elf_xlate(3E)
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.
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.
REFERENCES
elf(3E), elf_fsize(3E), elf_getdata(3E), elf_getident(3E)
Copyright 1994 Novell, Inc. Page 2