elf32_xlatetom
translates various data structures from their 32-bit class
file representations to their memory representations;
elf32_xlatetof
provides the inverse.
elf64_xlatetom and elf64_xlatetof provide the same
functionality for 64-bit class files.
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(ELF)].
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(ELF)
describes the
Elf_Data
descriptor, which the translation routines use as follows.
Both the source and destination must have valid buffer pointers.
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.
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.
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
64-Bit Memory Type
ELF_T_ADDR
Elf32_Addr
Elf64_Addr
ELF_T_BYTE
unsigned char
unsigned char
ELF_T_DYN
Elf32_Dyn
Elf64_Dyn
ELF_T_EHDR
Elf32_Ehdr
Elf64_Fhdr
ELF_T_HALF
Elf32_Half
Elf64_Half
ELT_T_OFF
Elf32_Off
Elf64_Off
ELF_T_PHDR
Elf32_Phdr
Elf64_Phdr
ELF_T_REL
Elf32_Rel
Elf64_Rel
ELF_T_RELA
Elf32_Rela
Elf64_Rela
ELF_T_SHDR
Elf32_Shdr
Elf64_Shdr
ELF_T_SWORD
Elf32_Sword
Elf64_Sword
ELF_T_SYM
Elf32_Sym
Elf64_Sym
ELF_T_WORD
Elf32_Word
Elf64_Word
ELF_T_XWORD
Elf64_Xword
ELF_T_SXWORD
Elf64_Sxword
``Translating'' buffers of type
ELF_T_BYTE
does not change the byte order.