Code segment

In computing, a code segment, also known as a text segment or simply as text, is a portion of an object file or the corresponding section of the program's virtual address space that contains executable instructions.

[1] The term "segment" comes from the memory segment, which is a historical approach to memory management that has been succeeded by paging.

When a program is stored in an object file, the code segment is a part of this file; when the loader places a program into memory so that it may be executed, various memory regions are allocated (in particular, as pages), corresponding to both the segments in the object files and to segments only needed at run time.

The code segment in memory is typically read-only and has a fixed size, so on embedded systems it can usually be placed in read-only memory (ROM), without the need for loading.

[1][2] As a memory region, the code segment may be placed below the heap or stack in order to prevent heap and stack overflows from overwriting it.