[]byte{0x85, 0x7a, 0xab, 0x99, 0xc5, 0xb2, 0x52, 0xc7, 0x42},       // Read([0 0 0 0 0 0 0 0 0])
	[]byte{0x9c, 0x32, 0xf3, 0xa8, 0xae, 0xb7, 0x9e, 0xf8, 0x56, 0xf6}, // Read([0 0 0 0 0 0 0 0 0 0])
	[]byte{0x59}, // Read([0])
	[]byte{0xc1, 0x8f, 0xd, 0xce, 0xcc, 0x77, 0xc7},                    // Read([0 0 0 0 0 0 0])
	[]byte{0x5e, 0x7a, 0x81, 0xbf, 0xde, 0x27, 0x5f, 0x67},             // Read([0 0 0 0 0 0 0 0])

	int64(73220195),            // Int64N(1000000000)
	int64(686060398),           // Int64N(1073741824)

	int64(0),                   // IntN(1)
	int64(6),                   // IntN(10)
	int64(8),                   // IntN(32)
	int64(704922),              // IntN(1048576)
	int64(245656),              // IntN(1048577)
	int64(41205257),            // IntN(1000000000)
	int64(43831929),            // IntN(1073741824)

	MOV	32(X2), T2
	MOV	T2, m_vdsoSP(S3)
	// sec is in T0, nsec in T1
	// return nsec in T0
	MOV	$1000000000, T2
	MUL	T2, T0
	ADD	T1, T0
	MOV	T0, ret+0(FP)
	RET

fallback:
	MOV	$8(X2), A1
	MOV	$SYS_clock_gettime, A7
	ECALL
	MOV	8(X2), T0	// sec
	MOV	16(X2), T1	// nsec
	MOV	$1000000000, T2
	MUL	T2, T0
	ADD	T1, T0
	MOV	T0, ret+0(FP)
	RET

		throw("sem_init")
	}
	mp.waitsema = uintptr(unsafe.Pointer(sem))
}

//go:nosplit
func semasleep(ns int64) int32 {
	mp := getg().m
	if ns >= 0 {
		mp.ts.tv_sec = ns / 1000000000
		mp.ts.tv_nsec = ns % 1000000000

		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_reltimedwait_np))
		mp.libcall.n = 2
		mp.scratch = mscratch{}
		mp.scratch.v[0] = mp.waitsema

	MOVV	$SYS_pipe2, R11
	SYSCALL
	MOVW	R4, errno+16(FP)
	RET

// func usleep(usec uint32)
TEXT runtime·usleep(SB),NOSPLIT,$16-4
	MOVWU	usec+0(FP), R7
	MOVV	$1000, R6
	MULVU	R6, R7, R7
	MOVV	$1000000000, R6

	DIVVU	R6, R7, R5	// ts->tv_sec
	REMVU	R6, R7, R4	// ts->tv_nsec
	MOVV	R5, 8(R3)
	MOVV	R4, 16(R3)

	// nanosleep(&ts, 0)
	ADDV	$8, R3, R4
	MOVV	R0, R5
	MOVV	$SYS_nanosleep, R11

        assertEquals("1.0 GB", format.format(_999_megabytes, ScaleUnit.GIGABYTE));

        long _1000_megabytes = 1000L * 1000L * 1000L;
        assertEquals("1.0 GB", format.format(_1000_megabytes));
        assertEquals("1000000000 B", format.format(_1000_megabytes, ScaleUnit.BYTE));
        assertEquals("1000000 kB", format.format(_1000_megabytes, ScaleUnit.KILOBYTE));
        assertEquals("1000 MB", format.format(_1000_megabytes, ScaleUnit.MEGABYTE));

	`0.e+1 = 0.`,
	`123.E-1_0 = 123e-10`,
	`01_23.e123 = 123e123`,

	`.0e-1 = .0`,
	`.123E+10 = .123e10`,
	`.0123E123 = .0123e123`,

	`1_2_3.123 = 123.123`,
	`0123.01_23 = 123.0123`,

	`1e-1000000000 = 0`,
	`1e+1000000000 = ?`,
	`6e5518446744 = ?`,
	`-6e5518446744 = ?`,

	// hexadecimal floats
	`0x0.p+0 = 0.`,
	`0Xdeadcafe.p-10 = 0xdeadcafe/1024`,
	`0x1234.P84 = 0x1234000000000000000000000`,

	`0x.1p-0 = 1/16`,

	LEAQ	8(SP), SI		// arg 2 - tp
	MOVL	$SYS___clock_gettime50, AX
	SYSCALL
	MOVQ	8(SP), AX		// sec
	MOVQ	16(SP), DX		// nsec

	// sec is in AX, nsec in DX
	// return nsec in AX
	IMULQ	$1000000000, AX
	ADDQ	DX, AX
	MOVQ	AX, ret+0(FP)
	RET

TEXT runtime·getcontext(SB),NOSPLIT,$-8
	MOVQ	ctxt+0(FP), DI		// arg 1 - context
	MOVL	$SYS_getcontext, AX
	SYSCALL
	JCC	2(PC)

	MOVW $3, R0 // CLOCK_MONOTONIC
	MOVW $8(R13), R1
	SWI $SYS___clock_gettime50

	MOVW 8(R13), R0 // sec.low
	MOVW 12(R13), R4 // sec.high
	MOVW 16(R13), R2 // nsec

	MOVW $1000000000, R3
	MULLU R0, R3, (R1, R0)
	MUL R3, R4
	ADD.S R2, R0
	ADC R4, R1

	MOVW R0, ret_lo+0(FP)
	MOVW R1, ret_hi+4(FP)
	RET

TEXT runtime·getcontext(SB),NOSPLIT|NOFRAME,$0

	MOVW $4, R0 // CLOCK_MONOTONIC
	MOVW $8(R13), R1
	MOVW $SYS_clock_gettime, R7
	SWI $0

	MOVW 8(R13), R0 // sec.low
	MOVW 12(R13), R4 // sec.high
	MOVW 16(R13), R2 // nsec

	MOVW $1000000000, R3
	MULLU R0, R3, (R1, R0)
	MUL R3, R4
	ADD.S R2, R0
	ADC R4, R1

	MOVW R0, ret_lo+0(FP)
	MOVW R1, ret_hi+4(FP)
	RET

TEXT runtime·asmSigaction(SB),NOSPLIT|NOFRAME,$0