add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/sigaltstack/sas.c
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@@ -19,6 +19,7 @@
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 #include <errno.h>
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 #include "../kselftest.h"
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+#include "current_stack_pointer.h"
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 #ifndef SS_AUTODISARM
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 #define SS_AUTODISARM  (1U << 31)
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@@ -39,12 +40,6 @@
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 	int err;
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 	stack_t stk;
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 	struct stk_data *p;
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-
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-#if __s390x__
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-	register unsigned long sp asm("%15");
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-#else
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-	register unsigned long sp asm("sp");
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-#endif
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 	if (sp < (unsigned long)sstack ||
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 			sp >= (unsigned long)sstack + SIGSTKSZ) {