![]() ![]() The two tables describe the rest of theĪs you can see from the description above, an ELF file consists of two sections – an ELF header, and file data. Header table and the section header table's offset in the file areĭefined in the ELF header. ![]() ![]() The ELF header is always at offset zero of the file. Object files, core files and shared libraries.Īn executable file using the ELF file format consists of an ELF header,įollowed by a program header table or a section header table, or both. Amongst these files are normal executable files, relocatable The header file defines the format of ELF executable binaryįiles. On a Linux terminal, the command man elf gives you a handy summary about the structure of an ELF file: Listing 1: The manpage of the ELF structureĮlf - format of Executable and Linking Format (ELF) files In use is a variety of letter combinations, such as. The specification does not clarify the filename extension for ELF files. Furthermore, you will find it on mobile devices running Android, Maemo or Meego OS/Sailfish OS as well as on game consoles like the PlayStation Portable, Dreamcast, and Wii. Among others, this includes Linux, Solaris/Illumos, Free-, Net- and OpenBSD, QNX, BeOS/Haiku, and Fuchsia OS. Since then, the ELF format is in use by several different operating systems. For a detailed comparison of executable file formats, have a look here. ELF’s design is not limited to a specific processor, instruction set, or hardware architecture. The reason behind that decision was the design of ELF – flexibility, extensibility, and cross-platform support for different endian formats and address sizes. This fact enormously simplified the agreement on standardization between the different vendors and developers of Unix-based operating systems. Luckily, the ELF format had been previously documented in both the System V Application Binary Interface, and the Tool Interface Standard. Twenty years ago – in 1999 – the 86open project has chosen ELF as the standard binary file format for Unix and Unix-like systems on x86 processors. ![]() It is widely used for executable files, relocatable object files, shared libraries, and core dumps. The binary file mentioned above follows a specific structure, and one of the most common ones is named ELF that abbreviates Executable and Linkable Format. This file contains the single instructions as machine code that are understood by the CPU, and are executed as soon the compiled program is run. Eventually, the linker translates the object code into a binary file that links the object code with the referenced libraries. With the help of an adequate compiler, for example GCC, your source code is translated into object code, first. Programming starts with having a clever idea, and writing source code in a programming language of your choice, for example C, and saving the source code in a file. ![]()
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