Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computing, a code segment, also known as a text segment or simply as text, is a phrase used to refer to a portion of memory or of an object file that contains executable instructions. It has a fixed size and is usually read-only. If the text section is not read-only, then the particular architecture allows self-modifying code. Fixed-position or position independent code may be shared in memory by several processes in segmented or paged memory systems. As a memory region, a code segment may be placed below the heap or stack in order to prevent heaps and stack overflows from overwriting it.

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