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-rw-r--r--mdk-stage1/dietlibc/x86_64/__testandset.S12
1 files changed, 12 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/x86_64/__testandset.S b/mdk-stage1/dietlibc/x86_64/__testandset.S
new file mode 100644
index 000000000..7355477e6
--- /dev/null
+++ b/mdk-stage1/dietlibc/x86_64/__testandset.S
@@ -0,0 +1,12 @@
+#include "dietwarning.h"
+
+.text
+.global __testandset
+.type __testandset,@function
+__testandset:
+ xorl %eax,%eax
+ incl %eax
+ xchg %rax,(%rdi)
+ ret
+
+link_warning("__testandset", "warning: __testandset() was never tested!")