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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
import (
"internal/abi"
"unsafe"
)
func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintptr) {
// Machine dependent mcontext initialisation for LWP.
mc.__gregs[_REG_R15] = uint32(abi.FuncPCABI0(lwp_tramp))
mc.__gregs[_REG_R13] = uint32(uintptr(stk))
mc.__gregs[_REG_R0] = uint32(uintptr(unsafe.Pointer(mp)))
mc.__gregs[_REG_R1] = uint32(uintptr(unsafe.Pointer(gp)))
mc.__gregs[_REG_R2] = uint32(fn)
}
func checkgoarm() {
// TODO(minux): FP checks like in os_linux_arm.go.
// osinit not called yet, so ncpu not set: must use getncpu directly.
if getncpu() > 1 && goarm < 7 {
print("runtime: this system has multiple CPUs and must use\n")
print("atomic synchronization instructions. Recompile using GOARM=7.\n")
exit(1)
}
}
//go:nosplit
func cputicks() int64 {
// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
return nanotime()
}
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