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