github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/os_netbsd_arm.go (about)

     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  
     5  package runtime
     6  
     7  import (
     8  	"internal/abi"
     9  	"unsafe"
    10  )
    11  
    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_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  
    21  func 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
    33  func cputicks() int64 {
    34  	// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
    35  	// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
    36  	return nanotime()
    37  }