src/runtime/os_dragonfly.go - go - Git at Google

 // 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 closeonexec(fd 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.
 	lwp_create(&params)
 	sigprocmask(_SIG_SETMASK, &oset, nil)
 }

 func osinit() {
 	ncpu = getncpu()
 	if physPageSize == 0 {
 		physPageSize = getPageSize()
 	}
 }

 var urandom_dev = []byte("/dev/urandom\x00")

 //go:nosplit
 func getRandomData(r []byte) {
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
 	closefd(fd)
 	extendRandom(r, 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()
 }

 // 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
 }

 // setSignaltstackSP 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++

 	auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*goarch.PtrSize))
 	sysauxv(auxv[:])
 }

 const (
 	_AT_NULL   = 0
 	_AT_PAGESZ = 6
 )

 func sysauxv(auxv []uintptr) {
 	for i := 0; auxv[i] != _AT_NULL; i += 2 {
 		tag, val := auxv[i], auxv[i+1]
 		switch tag {
 		case _AT_PAGESZ:
 			physPageSize = val
 		}
 	}
 }

 // 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")
 }
	// 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 closeonexec(fd 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.
	lwp_create(&params)
	sigprocmask(_SIG_SETMASK, &oset, nil)
	}

	func osinit() {
	ncpu = getncpu()
	if physPageSize == 0 {
	physPageSize = getPageSize()
	}
	}

	var urandom_dev = []byte("/dev/urandom\x00")

	//go:nosplit
	func getRandomData(r []byte) {
	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
	closefd(fd)
	extendRandom(r, 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()
	}

	// 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
	}

	// setSignaltstackSP 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++

	auxv := ([1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)goarch.PtrSize))
	sysauxv(auxv[:])
	}

	const (
	_AT_NULL = 0
	_AT_PAGESZ = 6
	)

	func sysauxv(auxv []uintptr) {
	for i := 0; auxv[i] != _AT_NULL; i += 2 {
	tag, val := auxv[i], auxv[i+1]
	switch tag {
	case _AT_PAGESZ:
	physPageSize = val
	}
	}
	}

	// 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")
	}