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.
12 func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintptr) {
13 // Machine dependent mcontext initialisation for LWP.
14 mc.__gregs[_REG_ELR] = uint64(abi.FuncPCABI0(lwp_tramp))
15 mc.__gregs[_REG_X31] = uint64(uintptr(stk))
16 mc.__gregs[_REG_X0] = uint64(uintptr(unsafe.Pointer(mp)))
17 mc.__gregs[_REG_X1] = uint64(uintptr(unsafe.Pointer(mp.g0)))
18 mc.__gregs[_REG_X2] = uint64(fn)
22 func cputicks() int64 {
23 // Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
24 // runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.