1// Copyright 2019 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package runtime
6
7import "unsafe"
8
9func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintptr) {
10	// Machine dependent mcontext initialisation for LWP.
11	mc.__gregs[_REG_ELR] = uint64(funcPC(lwp_tramp))
12	mc.__gregs[_REG_X31] = uint64(uintptr(stk))
13	mc.__gregs[_REG_X0] = uint64(uintptr(unsafe.Pointer(mp)))
14	mc.__gregs[_REG_X1] = uint64(uintptr(unsafe.Pointer(mp.g0)))
15	mc.__gregs[_REG_X2] = uint64(fn)
16}
17
18//go:nosplit
19func cputicks() int64 {
20	// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
21	// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
22	return nanotime()
23}
24