}
func nanotime_trampoline()

// walltime should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - gitee.com/quant1x/gox
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname walltime
//go:nosplit
//go:cgo_unsafe_args
func walltime() (int64, int32) {
	var t timespec

	MOVV	addr+0(FP), R4
	MOVV	n+8(FP), R5
	MOVV	dst+16(FP), R6
	MOVV	$SYS_mincore, R2
	SYSCALL
	SUBVU	R2, R0, R2	// caller expects negative errno
	MOVW	R2, ret+24(FP)
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$16-12
	MOVV	R29, R16	// R16 is unchanged by C code
	MOVV	R29, R1

	MOVV	g_m(g), R17	// R17 = m

	// Set vdsoPC and vdsoSP for SIGPROF traceback.

					// func nanotime1() int64
					"runtime.nanotime1": (sp) => {
						sp >>>= 0;
						setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
					},

					// func walltime() (sec int64, nsec int32)
					"runtime.walltime": (sp) => {
						sp >>>= 0;
						const msec = (new Date).getTime();
						setInt64(sp + 8, msec / 1000);
						this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
					},

TEXT runtime·setitimer(SB),NOSPLIT,$-8
	MOVL	mode+0(FP), DI		// arg 1 - which
	MOVQ	new+8(FP), SI		// arg 2 - itv
	MOVQ	old+16(FP), DX		// arg 3 - oitv
	MOVL	$SYS___setitimer50, AX
	SYSCALL
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB), NOSPLIT, $32
	MOVQ	$CLOCK_REALTIME, DI	// arg 1 - clock_id
	LEAQ	8(SP), SI		// arg 2 - tp
	MOVL	$SYS___clock_gettime50, AX
	SYSCALL
	MOVQ	8(SP), AX		// sec

	RET

TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0
	MOVW mode+0(FP), R0	// arg 1 - which
	MOVW new+4(FP), R1	// arg 2 - itv
	MOVW old+8(FP), R2	// arg 3 - oitv
	SWI $SYS___setitimer50
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB), NOSPLIT, $32
	MOVW $0, R0	// CLOCK_REALTIME
	MOVW $8(R13), R1
	SWI $SYS___clock_gettime50

	MOVW 8(R13), R0	// sec.low
	MOVW 12(R13), R1 // sec.high

}

func usleep1(usec uint32)

//go:nosplit
func usleep_no_g(µs uint32) {
	usleep1(µs)
}

//go:nosplit
func usleep(µs uint32) {
	usleep1(µs)
}

func walltime() (sec int64, nsec int32) {
	var ts mts
	sysvicall2(&libc_clock_gettime, _CLOCK_REALTIME, uintptr(unsafe.Pointer(&ts)))
	return ts.tv_sec, int32(ts.tv_nsec)
}

//go:nosplit

TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
	MOV	addr+0(FP), A0
	MOV	n+8(FP), A1
	MOV	dst+16(FP), A2
	MOV	$SYS_mincore, A7
	ECALL
	MOVW	A0, ret+24(FP)
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$40-12
	MOV	$CLOCK_REALTIME, A0

	MOV	runtime·vdsoClockgettimeSym(SB), A7
	BEQZ	A7, fallback
	MOV	X2, S2 // S2,S3,S4 is unchanged by C code

	RET

TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
	MOVD	addr+0(FP), R2
	MOVD	n+8(FP), R3
	MOVD	dst+16(FP), R4
	MOVW	$SYS_mincore, R1
	SYSCALL
	MOVW	R2, ret+24(FP)
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$32-12
	MOVW	$0, R2			// CLOCK_REALTIME
	MOVD	R15, R7			// Backup stack pointer

	MOVD	g_m(g), R6		//m

                                  meta_graph.saver_def().filename_tensor_name(),
                                  asset_file_defs, session->get()));
  }
  // Record walltime spent in restoring graph from disk, but postpone metric
  // increments until graph init finishes.
  const uint64 restore_graph_walltime =
      GetLatencyMicroseconds(read_start_microseconds);

TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
	MOVV	addr+0(FP), R4
	MOVV	n+8(FP), R5
	MOVV	dst+16(FP), R6
	MOVV	$SYS_mincore, R11
	SYSCALL
	MOVW	R4, ret+24(FP)
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$24-12
	MOVV	R3, R23	// R23 is unchanged by C code
	MOVV	R3, R25

	MOVV	g_m(g), R24	// R24 = m

	// Set vdsoPC and vdsoSP for SIGPROF traceback.