[PATCH] D96005: [AArch64] Stack probing for dynamic allocas in SelectionDAG

[Oliver Stannard (Linaro) via Phabricator via llvm-commits]

ostannard created this revision.
ostannard added reviewers: jnspaulsson, serge-sans-paille, bzEq, tnfchris.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
ostannard requested review of this revision.
Herald added a project: LLVM.

This adds a stack probing instruction sequence for dynamic stack
allocations, to protect against stack clash attacks. The instruction
sequence used is the same one used for unknown-size allocations in
function prologues.

This patch only applies to the SelectionDAG instruction selector,
GlobalISel support will be added in a later patch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96005

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/test/CodeGen/AArch64/stack-probing-dynamic.ll

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