// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVQ	m_vdsoPC(BX), CX
	MOVQ	m_vdsoSP(BX), DX
	MOVQ	CX, 0(SP)
	MOVQ	DX, 8(SP)

	LEAQ	sec+0(FP), DX
	MOVQ	-8(DX), CX	// Sets CX to function return address.
	MOVQ	CX, m_vdsoPC(BX)
	MOVQ	DX, m_vdsoSP(BX)

	CMPQ	R14, m_curg(BX)	// Only switch if on curg.
	JNE	noswitch

	MOVQ	m_g0(BX), DX

	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVV	m_vdsoPC(R17), R2
	MOVV	m_vdsoSP(R17), R3
	MOVV	R2, 8(R29)
	MOVV	R3, 16(R29)

	MOVV	$ret-8(FP), R2 // caller's SP
	MOVV	R31, m_vdsoPC(R17)
	MOVV	R2, m_vdsoSP(R17)

	MOVV	m_curg(R17), R4
	MOVV	g, R5
	BNE	R4, R5, noswitch

	MOVV	m_g0(R17), R4

	MOV	X2, S2 // S2,S3,S4 is unchanged by C code
	MOV	g_m(g), S3 // S3 = m

	// Save the old values on stack for reentrant
	MOV	m_vdsoPC(S3), T0
	MOV	T0, 24(X2)
	MOV	m_vdsoSP(S3), T0
	MOV	T0, 32(X2)

	MOV	RA, m_vdsoPC(S3)
	MOV	$ret-8(FP), T1 // caller's SP
	MOV	T1, m_vdsoSP(S3)

	MOV	m_curg(S3), T1
	BNE	g, T1, noswitch

	MOV	m_g0(S3), T1
	MOV	(g_sched+gobuf_sp)(T1), X2

noswitch:

	MOVD	runtime·vdsoClockgettimeSym(SB), R9	// Check for VDSO availability
	CMPBEQ	R9, $0, fallback

	MOVD	m_vdsoPC(R6), R4
	MOVD	R4, 16(R15)
	MOVD	m_vdsoSP(R6), R4
	MOVD	R4, 24(R15)

	MOVD	R14, R8 		// Backup return address
	MOVD	$sec+0(FP), R4 	// return parameter caller

	MOVD	R8, m_vdsoPC(R6)
	MOVD	R4, m_vdsoSP(R6)

	MOVD	m_curg(R6), R5
	CMP		g, R5
	BNE		noswitch

	MOVD	m_g0(R6), R4

	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVV	m_vdsoPC(R24), R11
	MOVV	m_vdsoSP(R24), R7
	MOVV	R11, 8(R3)
	MOVV	R7, 16(R3)

	MOVV    $ret-8(FP), R11 // caller's SP
	MOVV	R1, m_vdsoPC(R24)
	MOVV	R11, m_vdsoSP(R24)

	MOVV	m_curg(R24), R4
	MOVV	g, R5
	BNE	R4, R5, noswitch

	MOVV	m_g0(R24), R4

	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVD	m_vdsoPC(R21), R4
	MOVD	m_vdsoSP(R21), R5
	MOVD	R4, 32(R1)
	MOVD	R5, 40(R1)

	MOVD	LR, R14
	MOVD	$ret-FIXED_FRAME(FP), R5 // caller's SP
	MOVD	R14, m_vdsoPC(R21)
	MOVD	R5, m_vdsoSP(R21)

	MOVD	m_curg(R21), R6
	CMP	g, R6
	BNE	noswitch

	MOVD	m_g0(R21), R7

	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVD	m_vdsoPC(R21), R2
	MOVD	m_vdsoSP(R21), R3
	MOVD	R2, 8(RSP)
	MOVD	R3, 16(RSP)

	MOVD	$ret-8(FP), R2 // caller's SP
	MOVD	LR, m_vdsoPC(R21)
	MOVD	R2, m_vdsoSP(R21)

	MOVD	m_curg(R21), R0
	CMP	g, R0
	BNE	noswitch

	MOVD	m_g0(R21), R3

	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVL	m_vdsoPC(SI), CX
	MOVL	m_vdsoSP(SI), DX
	MOVL	CX, 0(SP)
	MOVL	DX, 4(SP)

	LEAL	sec+0(FP), DX
	MOVL	-4(DX), CX
	MOVL	CX, m_vdsoPC(SI)
	MOVL	DX, m_vdsoSP(SI)

	CMPL	AX, m_curg(SI)	// Only switch if on curg.
	JNE	noswitch

	MOVL	m_g0(SI), DX

	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVW	m_vdsoPC(R6), R7
	MOVW	m_vdsoSP(R6), R8
	MOVW	R7, 4(R13)
	MOVW	R8, 8(R13)

	MOVW	$sp-4(FP), R7 // caller's SP
	MOVW	LR, m_vdsoPC(R6)
	MOVW	R7, m_vdsoSP(R6)

	MOVW	m_curg(R6), R7

	CMP	g, R7		// Only switch if on curg.
	B.NE	noswitch

	MOVW	m_g0(R6), R7

	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVQ	m_vdsoPC(BX), CX
	MOVQ	m_vdsoSP(BX), DX
	MOVQ	CX, 0(SP)
	MOVQ	DX, 8(SP)

	LEAQ	ret+0(FP), DX
	MOVQ	-8(DX), CX
	MOVQ	CX, m_vdsoPC(BX)
	MOVQ	DX, m_vdsoSP(BX)

	CMPQ	R14, m_curg(BX)	// Only switch if on curg.
	JNE	noswitch

	MOVQ	m_g0(BX), DX