Final answer:
A 'REL32' fixup in programming refers to a 32-bit relative offset adjustment made to ensure code refers to the correct memory locations, enabling the creation of relocatable and position-independent code.
Step-by-step explanation:
A "REL32" fixup is a term used in computer programming, specifically in the context of assembly and linking of executable code. In this context, a fixup refers to the modification of a program's code or data content to ensure that it correctly refers to memory locations. This process is integral when creating relocatable code, which can be executed from any memory address, not just the address it was originally linked for.
In the case of a REL32 fixup, the term "REL32" stands for relative 32-bit. This means that the location in the code is not fixed but instead is a 32-bit offset from a certain point, usually the current instruction or a specific base address. During the link-time or load-time, these relative references are adjusted or "fixed up" to reflect the actual memory location where the code will reside. Fixups like REL32 are important for creating position-independent code, which is essential for various reasons, including security features like Address Space Layout Randomization (ASLR).