[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.
GitOrigin-RevId: 0aa22dcd2f6ec5f46b8ef18fee88066463734935
1 file changed
