elf_xlate(3E)
elf_xlate: elf32_xlatetof, elf32_xlatetom,elf64_xlatetof, elf64_xlatetom - class-dependent data translation
As shipped in IRIX 6.5. First release of IRIX 6.5.
NAME elf_xlate: 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(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, etc. 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. 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. The 64-bit class works identically, simply replacing all instances of 32 in the description and table with 64. SEE ALSO elf(3E), elf_fsize(3E), elf_getdata(3E), elf_getident(3E). CAVEAT By default, the Elf_Data used for the 64-bit class in a 32-bit application restricts one to building 64-bit class applications with only 32-bit fields unless the entire application is compiled with _LIBELF_XTND_64 defined (see elf.3e).