Fix null check in RhpLockCmpXchg64 (#99934)

dotnet · Mar 19, 2024 · c27c66d · c27c66d
1 parent fc46355
commit c27c66d
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/coreclr/nativeaot/Runtime/i386/Interlocked.asm b/src/coreclr/nativeaot/Runtime/i386/Interlocked.asm
@@ -14,14 +14,17 @@ FASTCALL_FUNC RhpLockCmpXchg64, 20
 _value$ = 16
 _comparand$ = 8
 
+ALTERNATE_ENTRY _RhpLockCmpXchg64AVLocation
+ ;; Null check
+ cmp dword ptr [ecx], ecx
+
  mov eax, DWORD PTR _comparand$[esp-4]
  mov edx, DWORD PTR _comparand$[esp]
  push ebx
  mov ebx, DWORD PTR _value$[esp]
  push esi
  mov esi, ecx
  mov ecx, DWORD PTR _value$[esp+8]
-ALTERNATE_ENTRY _RhpLockCmpXchg64AVLocation
  lock cmpxchg8b QWORD PTR [esi]
  pop esi
  pop ebx