commit dc6473867e43c3a56d8dbefcb68d5e0b57f7038f
author David CARLIER <devnexen@gmail.com> Mon Nov 08 22:26:32 2021 +0000
committer Copybara-Service <copybara-worker@google.com> Mon Nov 08 14:30:45 2021 -0800
tree 8bd42be0f4fb0ccc5a879e30fb8d6800f883ce62
parent f341d21f65da4ca0099ddb67e749b20f6c5894a2

[compiler-rt] TlsBaseAddr value for darwin arm64

getting the tls base address. unlike linux arm64, the tpidr_el0 returns always 0 (aka unused)
thus using tpidrro_el0 instead clearing up the cpu id encoded in the lower bits.

Reviewed-By: yln

Differential Revision: https://reviews.llvm.org/D112866

GitOrigin-RevId: 443820179a849eac6ddb5cbf0ba5cc7bbc42e2d2

lib/sanitizer_common/sanitizer_mac.cpp

diff --git a/lib/sanitizer_common/sanitizer_mac.cpp b/lib/sanitizer_common/sanitizer_mac.cpp
index 36a9d50..b67203d 100644
--- a/lib/sanitizer_common/sanitizer_mac.cpp
+++ b/lib/sanitizer_common/sanitizer_mac.cpp
@@ -543,6 +543,9 @@
   asm("movq %%gs:0,%0" : "=r"(segbase));
 #elif defined(__i386__)
   asm("movl %%gs:0,%0" : "=r"(segbase));
+#elif defined(__aarch64__)
+  asm("mrs %x0, tpidrro_el0" : "=r"(segbase));
+  segbase &= 0x07ul;  // clearing lower bits, cpu id stored there
 #endif
   return segbase;
 }