[all-commits] [llvm/llvm-project] 38a591: [OpenMP][AArch64] Fix branch protection in microta...

[Tulio Magno Quites Machado Filho via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 38a591de66a86aaf523f78f8266a2d5f01a1b106
      https://github.com/llvm/llvm-project/commit/38a591de66a86aaf523f78f8266a2d5f01a1b106
  Author: Tulio Magno Quites Machado Filho <tuliom at redhat.com>
  Date:   2024-08-20 (Tue, 20 Aug 2024)

  Changed paths:
    M openmp/runtime/src/z_Linux_asm.S

  Log Message:
  -----------
  [OpenMP][AArch64] Fix branch protection in microtasks (#102317)

Start __kmp_invoke_microtask with PACBTI in order to identify the
function as a valid branch target. Before returning, SP is
authenticated.
Also add the BTI and PAC markers to z_Linux_asm.S.

With this patch, libomp.so can now be generated with DT_AARCH64_BTI_PLT
when built with -mbranch-protection=standard.

The implementation is based on the code available in compiler-rt.

(cherry picked from commit 0aa22dcd2f6ec5f46b8ef18fee88066463734935)



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