//go:linkname libc_sem_reltimedwait_np libc_sem_reltimedwait_np
//go:linkname libc_sem_wait libc_sem_wait
//go:linkname libc_setitimer libc_setitimer
//go:linkname libc_sigaction libc_sigaction
//go:linkname libc_sigaltstack libc_sigaltstack
//go:linkname libc_sigprocmask libc_sigprocmask
//go:linkname libc_sysconf libc_sysconf
//go:linkname libc_usleep libc_usleep
//go:linkname libc_write libc_write
//go:linkname libc_pipe2 libc_pipe2

var (

//go:linkname libc_sem_timedwait libc_sem_timedwait
//go:linkname libc_sem_wait libc_sem_wait
//go:linkname libc_setitimer libc_setitimer
//go:linkname libc_sigaction libc_sigaction
//go:linkname libc_sigaltstack libc_sigaltstack
//go:linkname libc_sysconf libc_sysconf
//go:linkname libc_usleep libc_usleep
//go:linkname libc_write libc_write
//go:linkname libc_getuid libc_getuid
//go:linkname libc_geteuid libc_geteuid

//go:cgo_import_dynamic libc_kqueue kqueue "libc.so"
//go:cgo_import_dynamic libc_kevent kevent "libc.so"

//go:cgo_import_dynamic libc_sigaction sigaction "libc.so"
//go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so"

//go:cgo_import_dynamic libc_issetugid issetugid "libc.so"

	BNE	3(PC)
	MOVD	$0, R0			// crash on syscall failure
	MOVD	R0, (R0)
	RET

TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
	MOVD	8(R0), R1		// arg 2 - old
	MOVD	0(R0), R0		// arg 1 - new
	CALL	libc_sigaltstack(SB)
	CMP	$-1, R0
	BNE	3(PC)
	MOVD	$0, R0			// crash on syscall failure
	MOVD	R0, (R0)
	RET

// syscall calls a function in libc on behalf of the syscall package.

	BNE	3(PC)
	MOVD	$0, R3			// crash on syscall failure
	MOVD	R3, (R3)
	RET

TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$32
	MOVD	8(R3), R4		// arg 2 - old
	MOVD	0(R3), R3		// arg 1 - new
	CALL	libc_sigaltstack(SB)
	CMP	R3, $-1
	BNE	3(PC)
	MOVD	$0, R3			// crash on syscall failure
	MOVD	R3, (R3)
	RET

TEXT runtime·issetugid_trampoline(SB),NOSPLIT,$32
	MOVD	R3, R14			// pointer to args

	BNE	X5, X10, 3(PC)
	MOV	$0, X5			// crash on failure
	MOV	X5, (X5)
	RET

TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$8
	MOV	8(X10), X11		// arg 2 - old
	MOV	0(X10), X10		// arg 1 - new
	CALL	libc_sigaltstack(SB)
	MOV	$-1, X5
	BNE	X5, X10, 3(PC)
	MOV	$0, X5			// crash on failure
	MOV	X5, (X5)
	RET

TEXT runtime·issetugid_trampoline(SB),NOSPLIT,$0
	MOV	X10, X9			// pointer to args

//go:cgo_import_dynamic libc_sigaction sigaction "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_pthread_sigmask pthread_sigmask "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_sigaltstack sigaltstack "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_getpid getpid "/usr/lib/libSystem.B.dylib"
//go:cgo_import_dynamic libc_kill kill "/usr/lib/libSystem.B.dylib"

	TESTL	AX, AX
	JEQ	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
	MOVQ	8(DI), SI		// arg 2 old
	MOVQ	0(DI), DI		// arg 1 new
	CALL	libc_sigaltstack(SB)
	TESTQ	AX, AX
	JEQ	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

// syscall calls a function in libc on behalf of the syscall package.
// syscall takes a pointer to a struct like:
// struct {

	// to do the stack switch ourselves.
	MOVW	$43, R0
	BL	libc_exit(SB)
#else
	MOVD	8(R0), R1		// arg 2 old
	MOVD	0(R0), R0		// arg 1 new
	CALL	libc_sigaltstack(SB)
	CBZ	R0, 2(PC)
	BL	notok<>(SB)
#endif
	RET

// Thread related functions

// mstart_stub is the first function executed on a new thread started by pthread_create.

	TESTL	AX, AX
	JEQ	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
	MOVQ	8(DI), SI		// arg 2 old
	MOVQ	0(DI), DI		// arg 1 new
	CALL	libc_sigaltstack(SB)
	TESTQ	AX, AX
	JEQ	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
	MOVL	0(DI), BX	// signal
	CALL	libc_getpid(SB)
	MOVL	AX, DI		// arg 1 pid