//go:cgo_import_dynamic libc_mach_vm_region mach_vm_region "/usr/lib/libSystem.B.dylib""
//go:cgo_import_dynamic libc_mach_timebase_info mach_timebase_info "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_mach_absolute_time mach_absolute_time "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_clock_gettime clock_gettime "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_sigaction sigaction "/usr/lib/libSystem.B.dylib"

	BL	libc_clock_gettime(SB)
	RET

GLOBL timebase<>(SB),NOPTR,$(machTimebaseInfo__size)

TEXT runtime·nanotime_trampoline(SB),NOSPLIT,$40
	MOVD	R0, R19
	BL	libc_mach_absolute_time(SB)
	MOVD	R0, 0(R19)
	MOVW	timebase<>+machTimebaseInfo_numer(SB), R20
	MOVD	$timebase<>+machTimebaseInfo_denom(SB), R21
	LDARW	(R21), R21	// atomic read
	CMP	$0, R21
	BNE	initialized

	RET

TEXT runtime·mlock_trampoline(SB), NOSPLIT, $0
	UNDEF // unimplemented

GLOBL timebase<>(SB),NOPTR,$(machTimebaseInfo__size)

TEXT runtime·nanotime_trampoline(SB),NOSPLIT,$0
	MOVQ	DI, BX
	CALL	libc_mach_absolute_time(SB)
	MOVQ	AX, 0(BX)
	MOVL	timebase<>+machTimebaseInfo_numer(SB), SI
	MOVL	timebase<>+machTimebaseInfo_denom(SB), DI // atomic read
	TESTL	DI, DI
	JNE	initialized

	SUBQ	$(machTimebaseInfo__size+15)/16*16, SP