Red zone (computing)

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In computing, a red zone is a fixed-size area in memory beyond the stack pointer that has not been "allocated". This region of memory is not to be modified by interrupt/exception/signal handlers. This allows the space to be used for temporary data without the extra overhead of modifying the stack pointer. The x86-64 ABI mandates a 128-byte red zone.[1] The OpenRISC toolchain assumes a 128-byte red zone.[2]

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