D57017.id177888.diff
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	diff --git a/sys/arm64/include/_armreg.h b/sys/arm64/include/_armreg.h
	--- a/sys/arm64/include/_armreg.h
	+++ b/sys/arm64/include/_armreg.h
	@@ -52,6 +52,34 @@
	#define WRITE_SPECIALREG(reg, _val) \
	__asm __volatile("msr " __STRING(reg) ", %0" : : "r"((uint64_t)_val))

	+
	+#define __SYS_ALT_NAME(op1, crn, crm, op2) \
	+ "#" #op1 ", C" #crn ", C" #crm ", #" #op2
	+#define _SYS_ALT_NAME(op1, crn, crm, op2) \
	+ __SYS_ALT_NAME(op1, crn, crm, op2)
	+#define SYS_ALT_NAME(insn) \
	+ _SYS_ALT_NAME(insn##_op1, insn##_CRn, insn##_CRm, insn##_op2)
	+
	+#define SYS(insn) do { \
	+ _Static_assert(insn##_op0 == 1, "Invalid SYS instruction"); \
	+ __asm __volatile("sys " SYS_ALT_NAME(insn)); \
	+} while (0)
	+
	+#define SYS_ARG(insn, _val) do { \
	+ _Static_assert(insn##_op0 == 1, "Invalid SYS instruction"); \
	+ __asm __volatile("sys " SYS_ALT_NAME(insn) ", %0" \
	+ : : "r"((uint64_t)_val)); \
	+} while (0)
	+
	+#define SYSL(insn) \
	+({ \
	+ uint64_t _val; \
	+ _Static_assert(insn##_op0 == 1, "Invalid SYS instruction"); \
	+ __asm __volatile("sysl %0, " SYS_ALT_NAME(insn) \
	+ : "=&r"(_val)); \
	+ _val; \
	+})
	+
	#define UL(x) UINT64_C(x)

	#endif /* !_MACHINE__ARMREG_H_ */