[compiler-rt] 7f7cab6 - [sanitizer][aarch64] fix clone system call's inline assembly

[hyeongyu kim via llvm-commits]

Author: hyeongyu kim
Date: 2021-11-14T09:45:40+09:00
New Revision: 7f7cab6bb1d48b53e1fa9ab5a4fd7bcf7f00f19b

URL: https://github.com/llvm/llvm-project/commit/7f7cab6bb1d48b53e1fa9ab5a4fd7bcf7f00f19b
DIFF: https://github.com/llvm/llvm-project/commit/7f7cab6bb1d48b53e1fa9ab5a4fd7bcf7f00f19b.diff

LOG: [sanitizer][aarch64] fix clone system call's inline assembly

Return value of the system call was not returned normally.
It was discussed at https://reviews.llvm.org/D105169.

Added: 
    

Modified: 
    compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
index aa59d9718ca89..596037d772222 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -1380,7 +1380,7 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
 #elif defined(__aarch64__)
 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
                     int *parent_tidptr, void *newtls, int *child_tidptr) {
-  long long res;
+  register long long res __asm__("x0");
   if (!fn || !child_stack)
     return -EINVAL;
   CHECK_EQ(0, (uptr)child_stack % 16);