MOVD  $_rt0_arm64_darwin_lib_go(SB), R0
	MOVD  $0, R1
	SUB   $16, RSP		// reserve 16 bytes for sp-8 where fp may be saved.
	BL    (R4)
	ADD   $16, RSP

	// Restore callee-save registers.
	RESTORE_R19_TO_R28(8)
	RESTORE_F8_TO_F15(88)

	RET

TEXT _rt0_arm64_darwin_lib_go(SB),NOSPLIT,$0
	MOVD  _rt0_arm64_darwin_lib_argc<>(SB), R0
	MOVD  _rt0_arm64_darwin_lib_argv<>(SB), R1
	MOVD  $runtime·rt0_go(SB), R4

	MOVD	R5, R0
	MOVD	R6, R1
	// Calling ABIInternal because TLS might be nil.
	BL	runtime·sigtrampgo<ABIInternal>(SB)
	// Return value is already stored in R0.

	// Restore callee-save registers.
	RESTORE_R19_TO_R28(8*4)
	RESTORE_F8_TO_F15(8*14)
	MOVD	R7, LR
	RET

// Trampoline to resume execution from exception handler.
// This is part of the control flow guard workaround.

	STP	(R19, R20), ((offset)+0*8)(RSP) \
	STP	(R21, R22), ((offset)+2*8)(RSP) \
	STP	(R23, R24), ((offset)+4*8)(RSP) \
	STP	(R25, R26), ((offset)+6*8)(RSP) \
	STP	(R27, g), ((offset)+8*8)(RSP)

#define RESTORE_R19_TO_R28(offset) \
	LDP	((offset)+0*8)(RSP), (R19, R20) \
	LDP	((offset)+2*8)(RSP), (R21, R22) \
	LDP	((offset)+4*8)(RSP), (R23, R24) \
	LDP	((offset)+6*8)(RSP), (R25, R26) \
	LDP	((offset)+8*8)(RSP), (R27, g) /* R28 */

	MOVD	R3, (8*3)(RSP)

	SAVE_R19_TO_R28(8*4)
	SAVE_F8_TO_F15(8*14)
	STP	(R29, R30), (8*22)(RSP)


	// Initialize Go ABI environment
	BL	runtime·load_g(SB)
	BL	runtime·cgocallback(SB)

	RESTORE_R19_TO_R28(8*4)
	RESTORE_F8_TO_F15(8*14)
	LDP	(8*22)(RSP), (R29, R30)

	ADD	$(8*24), RSP

	MOVD	$_rt0_arm64_linux_lib_go(SB), R1
	MOVD	R0, 8(RSP)
	MOVD	R1, 16(RSP)
	MOVD	$runtime·newosproc0(SB),R4
	BL	(R4)

restore:
	// Restore callee-save registers.
	RESTORE_R19_TO_R28(24)
	RESTORE_F8_TO_F15(104)
	RET

TEXT _rt0_arm64_linux_lib_go(SB),NOSPLIT,$0
	MOVD	_rt0_arm64_linux_lib_argc<>(SB), R0
	MOVD	_rt0_arm64_linux_lib_argv<>(SB), R1
	MOVD	$runtime·rt0_go(SB),R4
	B       (R4)

	MOVD	$_rt0_arm64_freebsd_lib_go(SB), R1
	MOVD	R0, 8(RSP)
	MOVD	R1, 16(RSP)
	MOVD	$runtime·newosproc0(SB),R4
	BL	(R4)

restore:
	// Restore callee-save registers.
	RESTORE_R19_TO_R28(24)
	RESTORE_F8_TO_F15(104)
	RET

TEXT _rt0_arm64_freebsd_lib_go(SB),NOSPLIT,$0
	MOVD	_rt0_arm64_freebsd_lib_argc<>(SB), R0
	MOVD	_rt0_arm64_freebsd_lib_argv<>(SB), R1
	MOVD	$runtime·rt0_go(SB),R4

	MOVD	$_rt0_arm64_netbsd_lib_go(SB), R1
	MOVD	R0, 8(RSP)
	MOVD	R1, 16(RSP)
	MOVD	$runtime·newosproc0(SB),R4
	BL	(R4)

restore:
	// Restore callee-save registers.
	RESTORE_R19_TO_R28(24)
	RESTORE_F8_TO_F15(104)
	RET

TEXT _rt0_arm64_netbsd_lib_go(SB),NOSPLIT,$0
	MOVD	_rt0_arm64_netbsd_lib_argc<>(SB), R0
	MOVD	_rt0_arm64_netbsd_lib_argv<>(SB), R1
	MOVD	$runtime·rt0_go(SB),R4
	B       (R4)

	MOVD	$_rt0_arm64_openbsd_lib_go(SB), R1
	MOVD	R0, 8(RSP)
	MOVD	R1, 16(RSP)
	MOVD	$runtime·newosproc0(SB),R4
	BL	(R4)

restore:
	// Restore callee-save registers.
	RESTORE_R19_TO_R28(24)
	RESTORE_F8_TO_F15(104)
	RET

TEXT _rt0_arm64_openbsd_lib_go(SB),NOSPLIT,$0
	MOVD	_rt0_arm64_openbsd_lib_argc<>(SB), R0
	MOVD	_rt0_arm64_openbsd_lib_argv<>(SB), R1
	MOVD	$runtime·rt0_go(SB),R4

	// Save callee-save registers.
	SAVE_R19_TO_R28(8)
	SAVE_F8_TO_F15(88)

	MOVD    m_g0(R0), g
	BL	runtime·save_g(SB)

	BL	runtime·mstart(SB)

	// Restore callee-save registers.
	RESTORE_R19_TO_R28(8)
	RESTORE_F8_TO_F15(88)

	// Go is all done with this OS thread.
	// Tell pthread everything is ok (we never join with this thread, so
	// the value here doesn't really matter).
	MOVD	$0, R0

	RET

	MOVD	$runtime·sigtrampgo(SB), R11
	BL	(R11)

#ifdef GOOS_ios
	// Switch to old stack.
	MOVD	(8*4)(RSP), R5
	MOVD	R5, RSP
#endif

	// Restore callee-save registers.
	RESTORE_R19_TO_R28(8*4)
	RESTORE_F8_TO_F15(8*14)

	RET

TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
	JMP	runtime·sigtramp(SB)

TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
	MOVD	8(R0), R1	// arg 2 new