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// Copyright 2010 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 (
"runtime/internal/atomic"
"unsafe"
)
type sigset struct{}
// Called to initialize a new m (including the bootstrap m).
// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
func mpreinit(mp *m) {
// Initialize stack and goroutine for note handling.
mp.gsignal = malg(32 * 1024)
mp.gsignal.m = mp
mp.notesig = (*int8)(mallocgc(_ERRMAX, nil, _FlagNoScan))
// Initialize stack for handling strings from the
// errstr system call, as used in package syscall.
mp.errstr = (*byte)(mallocgc(_ERRMAX, nil, _FlagNoScan))
}
func msigsave(mp *m) {
}
func msigrestore(sigmask sigset) {
}
func sigblock() {
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, can not allocate memory.
func minit() {
// Mask all SSE floating-point exceptions
// when running on the 64-bit kernel.
setfpmasks()
}
// Called from dropm to undo the effect of an minit.
func unminit() {
}
var sysstat = []byte("/dev/sysstat\x00")
func getproccount() int32 {
var buf [2048]byte
fd := open(&sysstat[0], _OREAD, 0)
if fd < 0 {
return 1
}
ncpu := int32(0)
for {
n := read(fd, unsafe.Pointer(&buf), int32(len(buf)))
if n <= 0 {
break
}
for i := int32(0); i < n; i++ {
if buf[i] == '\n' {
ncpu++
}
}
}
closefd(fd)
if ncpu == 0 {
ncpu = 1
}
return ncpu
}
var pid = []byte("#c/pid\x00")
func getpid() uint64 {
var b [20]byte
fd := open(&pid[0], 0, 0)
if fd >= 0 {
read(fd, unsafe.Pointer(&b), int32(len(b)))
closefd(fd)
}
c := b[:]
for c[0] == ' ' || c[0] == '\t' {
c = c[1:]
}
return uint64(_atoi(c))
}
func osinit() {
initBloc()
ncpu = getproccount()
getg().m.procid = getpid()
notify(unsafe.Pointer(funcPC(sigtramp)))
}
func crash() {
notify(nil)
*(*int)(nil) = 0
}
//go:nosplit
func getRandomData(r []byte) {
extendRandom(r, 0)
}
func goenvs() {
}
func initsig(preinit bool) {
}
//go:nosplit
func osyield() {
sleep(0)
}
//go:nosplit
func usleep(µs uint32) {
ms := int32(µs / 1000)
if ms == 0 {
ms = 1
}
sleep(ms)
}
//go:nosplit
func nanotime() int64 {
var scratch int64
ns := nsec(&scratch)
// TODO(aram): remove hack after I fix _nsec in the pc64 kernel.
if ns == 0 {
return scratch
}
return ns
}
//go:nosplit
func itoa(buf []byte, val uint64) []byte {
i := len(buf) - 1
for val >= 10 {
buf[i] = byte(val%10 + '0')
i--
val /= 10
}
buf[i] = byte(val + '0')
return buf[i:]
}
var goexits = []byte("go: exit ")
func goexitsall(status *byte) {
var buf [_ERRMAX]byte
n := copy(buf[:], goexits)
n = copy(buf[n:], gostringnocopy(status))
pid := getpid()
for mp := (*m)(atomic.Loadp(unsafe.Pointer(&allm))); mp != nil; mp = mp.alllink {
if mp.procid != pid {
postnote(mp.procid, buf[:])
}
}
}
var procdir = []byte("/proc/")
var notefile = []byte("/note\x00")
func postnote(pid uint64, msg []byte) int {
var buf [128]byte
var tmp [32]byte
n := copy(buf[:], procdir)
n += copy(buf[n:], itoa(tmp[:], pid))
copy(buf[n:], notefile)
fd := open(&buf[0], _OWRITE, 0)
if fd < 0 {
return -1
}
len := findnull(&msg[0])
if write(uintptr(fd), unsafe.Pointer(&msg[0]), int32(len)) != int64(len) {
closefd(fd)
return -1
}
closefd(fd)
return 0
}
//go:nosplit
func exit(e int) {
var status []byte
if e == 0 {
status = []byte("\x00")
} else {
// build error string
var tmp [32]byte
status = append(itoa(tmp[:len(tmp)-1], uint64(e)), 0)
}
goexitsall(&status[0])
exits(&status[0])
}
// May run with m.p==nil, so write barriers are not allowed.
//go:nowritebarrier
func newosproc(mp *m, stk unsafe.Pointer) {
if false {
print("newosproc mp=", mp, " ostk=", &mp, "\n")
}
pid := rfork(_RFPROC | _RFMEM | _RFNOWAIT)
if pid < 0 {
throw("newosproc: rfork failed")
}
if pid == 0 {
tstart_plan9(mp)
}
}
//go:nosplit
func semacreate(mp *m) {
}
//go:nosplit
func semasleep(ns int64) int {
_g_ := getg()
if ns >= 0 {
ms := timediv(ns, 1000000, nil)
if ms == 0 {
ms = 1
}
ret := plan9_tsemacquire(&_g_.m.waitsemacount, ms)
if ret == 1 {
return 0 // success
}
return -1 // timeout or interrupted
}
for plan9_semacquire(&_g_.m.waitsemacount, 1) < 0 {
// interrupted; try again (c.f. lock_sema.go)
}
return 0 // success
}
//go:nosplit
func semawakeup(mp *m) {
plan9_semrelease(&mp.waitsemacount, 1)
}
//go:nosplit
func read(fd int32, buf unsafe.Pointer, n int32) int32 {
return pread(fd, buf, n, -1)
}
//go:nosplit
func write(fd uintptr, buf unsafe.Pointer, n int32) int64 {
return int64(pwrite(int32(fd), buf, n, -1))
}
func memlimit() uint64 {
return 0
}
var _badsignal = []byte("runtime: signal received on thread not created by Go.\n")
// This runs on a foreign stack, without an m or a g. No stack split.
//go:nosplit
func badsignal2() {
pwrite(2, unsafe.Pointer(&_badsignal[0]), int32(len(_badsignal)), -1)
exits(&_badsignal[0])
}
func raisebadsignal(sig int32) {
badsignal2()
}
func _atoi(b []byte) int {
n := 0
for len(b) > 0 && '0' <= b[0] && b[0] <= '9' {
n = n*10 + int(b[0]) - '0'
b = b[1:]
}
return n
}