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 (
8	"internal/abi"
9	"unsafe"
10)
11
12func 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_R15] = uint32(abi.FuncPCABI0(lwp_tramp))
15	mc.__gregs[_REG_R13] = uint32(uintptr(stk))
16	mc.__gregs[_REG_R0] = uint32(uintptr(unsafe.Pointer(mp)))
17	mc.__gregs[_REG_R1] = uint32(uintptr(unsafe.Pointer(gp)))
18	mc.__gregs[_REG_R2] = uint32(fn)
19}
20
21func checkgoarm() {
22	// TODO(minux): FP checks like in os_linux_arm.go.
23
24	// osinit not called yet, so ncpu not set: must use getncpu directly.
25	if getncpu() > 1 && goarm < 7 {
26		print("runtime: this system has multiple CPUs and must use\n")
27		print("atomic synchronization instructions. Recompile using GOARM=7.\n")
28		exit(1)
29	}
30}
31
32//go:nosplit
33func cputicks() int64 {
34	// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
35	return nanotime()
36}
37