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// Copyright 2014 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"
"internal/goarch"
"unsafe"
)
const (
_NSIG = 33
_SI_USER = 0
_SS_DISABLE = 4
_SIG_BLOCK = 1
_SIG_UNBLOCK = 2
_SIG_SETMASK = 3
)
type mOS struct{}
//go:noescape
func lwp_create(param *lwpparams) int32
//go:noescape
func sigaltstack(new, old *stackt)
//go:noescape
func sigaction(sig uint32, new, old *sigactiont)
//go:noescape
func sigprocmask(how int32, new, old *sigset)
//go:noescape
func setitimer(mode int32, new, old *itimerval)
//go:noescape
func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
func raiseproc(sig uint32)
func lwp_gettid() int32
func lwp_kill(pid, tid int32, sig int)
//go:noescape
func sys_umtx_sleep(addr *uint32, val, timeout int32) int32
//go:noescape
func sys_umtx_wakeup(addr *uint32, val int32) int32
func osyield()
//go:nosplit
func osyield_no_g() {
osyield()
}
func kqueue() int32
//go:noescape
func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32
func pipe2(flags int32) (r, w int32, errno int32)
func fcntl(fd, cmd, arg int32) (ret int32, errno int32)
func issetugid() int32
// From DragonFly's <sys/sysctl.h>
const (
_CTL_HW = 6
_HW_NCPU = 3
_HW_PAGESIZE = 7
)
var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}
func getncpu() int32 {
mib := [2]uint32{_CTL_HW, _HW_NCPU}
out := uint32(0)
nout := unsafe.Sizeof(out)
ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
if ret >= 0 {
return int32(out)
}
return 1
}
func getPageSize() uintptr {
mib := [2]uint32{_CTL_HW, _HW_PAGESIZE}
out := uint32(0)
nout := unsafe.Sizeof(out)
ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
if ret >= 0 {
return uintptr(out)
}
return 0
}
//go:nosplit
func futexsleep(addr *uint32, val uint32, ns int64) {
systemstack(func() {
futexsleep1(addr, val, ns)
})
}
func futexsleep1(addr *uint32, val uint32, ns int64) {
var timeout int32
if ns >= 0 {
// The timeout is specified in microseconds - ensure that we
// do not end up dividing to zero, which would put us to sleep
// indefinitely...
timeout = timediv(ns, 1000, nil)
if timeout == 0 {
timeout = 1
}
}
// sys_umtx_sleep will return EWOULDBLOCK (EAGAIN) when the timeout
// expires or EBUSY if the mutex value does not match.
ret := sys_umtx_sleep(addr, int32(val), timeout)
if ret >= 0 || ret == -_EINTR || ret == -_EAGAIN || ret == -_EBUSY {
return
}
print("umtx_sleep addr=", addr, " val=", val, " ret=", ret, "\n")
*(*int32)(unsafe.Pointer(uintptr(0x1005))) = 0x1005
}
//go:nosplit
func futexwakeup(addr *uint32, cnt uint32) {
ret := sys_umtx_wakeup(addr, int32(cnt))
if ret >= 0 {
return
}
systemstack(func() {
print("umtx_wake_addr=", addr, " ret=", ret, "\n")
*(*int32)(unsafe.Pointer(uintptr(0x1006))) = 0x1006
})
}
func lwp_start(uintptr)
// May run with m.p==nil, so write barriers are not allowed.
//
//go:nowritebarrier
func newosproc(mp *m) {
stk := unsafe.Pointer(mp.g0.stack.hi)
if false {
print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " lwp_start=", abi.FuncPCABI0(lwp_start), " id=", mp.id, " ostk=", &mp, "\n")
}
var oset sigset
sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
params := lwpparams{
start_func: abi.FuncPCABI0(lwp_start),
arg: unsafe.Pointer(mp),
stack: uintptr(stk),
tid1: nil, // minit will record tid
tid2: nil,
}
// TODO: Check for error.
retryOnEAGAIN(func() int32 {
lwp_create(¶ms)
return 0
})
sigprocmask(_SIG_SETMASK, &oset, nil)
}
func osinit() {
ncpu = getncpu()
if physPageSize == 0 {
physPageSize = getPageSize()
}
}
var urandom_dev = []byte("/dev/urandom\x00")
//go:nosplit
func readRandom(r []byte) int {
fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
closefd(fd)
return int(n)
}
func goenvs() {
goenvs_unix()
}
// 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) {
mp.gsignal = malg(32 * 1024)
mp.gsignal.m = mp
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
getg().m.procid = uint64(lwp_gettid())
minitSignals()
}
// Called from dropm to undo the effect of an minit.
//
//go:nosplit
func unminit() {
unminitSignals()
getg().m.procid = 0
}
// Called from exitm, but not from drop, to undo the effect of thread-owned
// resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
func mdestroy(mp *m) {
}
func sigtramp()
type sigactiont struct {
sa_sigaction uintptr
sa_flags int32
sa_mask sigset
}
//go:nosplit
//go:nowritebarrierrec
func setsig(i uint32, fn uintptr) {
var sa sigactiont
sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
sa.sa_mask = sigset_all
if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
fn = abi.FuncPCABI0(sigtramp)
}
sa.sa_sigaction = fn
sigaction(i, &sa, nil)
}
//go:nosplit
//go:nowritebarrierrec
func setsigstack(i uint32) {
throw("setsigstack")
}
//go:nosplit
//go:nowritebarrierrec
func getsig(i uint32) uintptr {
var sa sigactiont
sigaction(i, nil, &sa)
return sa.sa_sigaction
}
// setSignalstackSP sets the ss_sp field of a stackt.
//
//go:nosplit
func setSignalstackSP(s *stackt, sp uintptr) {
s.ss_sp = sp
}
//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
}
func sigdelset(mask *sigset, i int) {
mask.__bits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
}
//go:nosplit
func (c *sigctxt) fixsigcode(sig uint32) {
}
func setProcessCPUProfiler(hz int32) {
setProcessCPUProfilerTimer(hz)
}
func setThreadCPUProfiler(hz int32) {
setThreadCPUProfilerHz(hz)
}
//go:nosplit
func validSIGPROF(mp *m, c *sigctxt) bool {
return true
}
func sysargs(argc int32, argv **byte) {
n := argc + 1
// skip over argv, envp to get to auxv
for argv_index(argv, n) != nil {
n++
}
// skip NULL separator
n++
auxvp := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*goarch.PtrSize))
pairs := sysauxv(auxvp[:])
auxv = auxvp[: pairs*2 : pairs*2]
}
const (
_AT_NULL = 0
_AT_PAGESZ = 6
)
func sysauxv(auxv []uintptr) (pairs int) {
var i int
for i = 0; auxv[i] != _AT_NULL; i += 2 {
tag, val := auxv[i], auxv[i+1]
switch tag {
case _AT_PAGESZ:
physPageSize = val
}
}
return i / 2
}
// raise sends a signal to the calling thread.
//
// It must be nosplit because it is used by the signal handler before
// it definitely has a Go stack.
//
//go:nosplit
func raise(sig uint32) {
lwp_kill(-1, lwp_gettid(), int(sig))
}
func signalM(mp *m, sig int) {
lwp_kill(-1, int32(mp.procid), sig)
}
// sigPerThreadSyscall is only used on linux, so we assign a bogus signal
// number.
const sigPerThreadSyscall = 1 << 31
//go:nosplit
func runPerThreadSyscall() {
throw("runPerThreadSyscall only valid on linux")
}