1// Copyright 2013 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_R15] = uint32(funcPC(lwp_tramp))
12	mc.__gregs[_REG_R13] = uint32(uintptr(stk))
13	mc.__gregs[_REG_R0] = uint32(uintptr(unsafe.Pointer(mp)))
14	mc.__gregs[_REG_R1] = uint32(uintptr(unsafe.Pointer(gp)))
15	mc.__gregs[_REG_R2] = uint32(fn)
16}
17
18func checkgoarm() {
19	// TODO(minux): FP checks like in os_linux_arm.go.
20
21	// osinit not called yet, so ncpu not set: must use getncpu directly.
22	if getncpu() > 1 && goarm < 7 {
23		print("runtime: this system has multiple CPUs and must use\n")
24		print("atomic synchronization instructions. Recompile using GOARM=7.\n")
25		exit(1)
26	}
27}
28
29//go:nosplit
30func cputicks() int64 {
31	// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
32	// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
33	return nanotime()
34}
35