Elf file wikipedia

ELF is a format for storing programs or fragments of programs on disk, created as a result of compiling and linking.

An ELF file is divided into sections. For an executable program, these are the text section for the code, the data section for global variables and the rodata section that usually contains constant strings. The ELF file contains headers that describe how these sections should be stored in memory.

Note that depending on whether your file is a linkable or an executable file, the headers in the ELF file won't be the same: process. The 'flags' will tell you what's actually available in the ELF file.

Here, we have symbol tables and relocation: all that we need to link the file against another, but virtually no information about how to load the file in memory even if that could be guessed. We don't have the program entry point, for instance, and we have a sections table rather than a program header. The program that should be used to 'execute' the binary.

Now we're requested to read c bytes, starting at file's start? They'll be to appear starting at virtual address 0x for the program to work properly. More bits to load, likely to be. Notice that the 'filesize' and 'memsize' differ, which means the. The dynamic sections are used to store information used in the dynamic linking process, such as required libraries and relocation entries.

That means, however, that a part of the code is mapped twice, but with different permissions. I suggest you do give them different physical pages too if you don't want to end up with modifiable code. The ELF format has replaced older executable formats such as a. The ELF file format is also used as a generic object and executable format for binary images used with embedded processors Template:Category handler Template:Category handler [ citation needed ].

The segments contain information that is necessary for runtime execution of the file, while sections contain important data for linking and relocation. Each byte in the entire file is taken by no more than one section at a time, but there can be orphan bytes, which are not covered by a section. In the normal case of a Unix executable one or more sections are enclosed in one segment.

From eLinux. Jump to: navigation , search. This article has been viewed 3, times. Files with the. You can, however, download an emulator called Dolphin to access these files on your computer. Right-click the. Click Open With. Click Dolphin Emulator. Did this summary help you? Yes No. Log in Social login does not work in incognito and private browsers.

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