Red zone (computing)

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

In computing, a red zone is a fixed-size area in a function's stack frame beyond the current stack pointer which is not preserved by that function. The callee function may use the red zone for storing local variables without the extra overhead of modifying the stack pointer. This region of memory is not to be modified by interrupt/exception/signal handlers. The x86-64 ABI used by System V mandates a 128-byte red zone,[1][2] which begins directly under the current value of the stack pointer. The OpenRISC toolchain assumes a 128-byte red zone.[3]

Notes and references[edit]

  1. ^ "System V Application Binary Interface, AMD64 Architecture Processor Supplement" (PDF). Archived from the original (PDF) on 2016-07-06. Retrieved 2014-11-29. Cite uses deprecated parameter |deadurl= (help)
  2. ^ "i386 and x86-64 Options - Using the GNU Compiler Collection (GCC)". Retrieved 2011-04-10.
  3. ^ "OpenCores Wiki - OpenRISC GNU toolchain". Retrieved 2014-05-28.