"unsafe"
)

const (
	_NSIG        = 33
	_SI_USER     = 0
	_SS_DISABLE  = 4
	_SIG_BLOCK   = 1
	_SIG_UNBLOCK = 2
	_SIG_SETMASK = 3
)

type mOS struct{}

//go:noescape
func lwp_create(param *lwpparams) int32

//go:noescape
func sigaltstack(new, old *stackt)

//go:noescape
func sigaction(sig uint32, new, old *sigactiont)

//go:noescape
func sigprocmask(how int32, new, old *sigset)

	MOVL $470, AX		// umtx_wakeup
	SYSCALL
	JCC	2(PC)
	NEGQ	AX
	MOVL	AX, ret+16(FP)
	RET

TEXT runtime·lwp_create(SB),NOSPLIT,$0
	MOVQ param+0(FP), DI		// arg 1 - params
	MOVL $495, AX		// lwp_create
	SYSCALL
	MOVL	AX, ret+8(FP)
	RET

TEXT runtime·lwp_start(SB),NOSPLIT,$0
	MOVQ	DI, R13 // m

	// set up FS to point at m->tls
	LEAQ	m_tls(R13), DI
	CALL	runtime·settls(SB)	// smashes DI

	MOVL	BX, 4(SP)
	MOVL	40(SP), BX // context
	MOVL	BX, 8(SP)
	CALL	runtime·sigtrampgo(SB)

	MOVL	di-16(SP), DI
	MOVL	si-12(SP), SI
	MOVL	bp-8(SP),  BP
	MOVL	bx-4(SP),  BX
	RET

// int32 lwp_create(void *context, uintptr flags, void *lwpid);
TEXT runtime·lwp_create(SB),NOSPLIT,$16
	MOVL	$0, 0(SP)
	MOVL	ctxt+0(FP), AX
	MOVL	AX, 4(SP)		// arg 1 - context
	MOVL	flags+4(FP), AX
	MOVL	AX, 8(SP)		// arg 2 - flags

#define SYS___setitimer50		425
#define SYS___clock_gettime50		427
#define SYS___nanosleep50		430
#define SYS___kevent50			435
#define SYS_pipe2			453
#define SYS_openat			468
#define SYS____lwp_park60		478

// int32 lwp_create(void *context, uintptr flags, void *lwpid)
TEXT runtime·lwp_create(SB),NOSPLIT,$0
	MOVD	ctxt+0(FP), R0
	MOVD	flags+8(FP), R1
	MOVD	lwpid+16(FP), R2
	SVC	$SYS__lwp_create
	BCC	ok
	NEG	R0, R0
ok: