[PATCH] D149848: [AArch64, compiler-rt] Implement trampoline intrinsics

[Lou via Phabricator via llvm-commits]

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The llvm.init.trampoline intrinsic is custom lowered to a call of
__trampoline_setup in the AArch64 instruction selection. As these
trampolines require an executable stack, a fatal error is reported
on Android or AArch64 Darwin platforms instead.

The function __trampoline_setup is implemented in the compiler-rt
for the AArch64 architecture.

This patch is inspired by the implementation of the same
intrinsics on the PowerPC architecture.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149848

Files:
  compiler-rt/lib/builtins/trampoline_setup.c
  compiler-rt/test/builtins/Unit/trampoline_setup_test.c
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/test/CodeGen/AArch64/trampoline.ll

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