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

 // Copyright 2011 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/sys"
 	"unsafe"
 )

 type mOS struct{}

 //go:noescape
 func thr_new(param *thrparam, size 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

 //go:noescape
 func getrlimit(kind int32, limit unsafe.Pointer) int32
 func raise(sig uint32)
 func raiseproc(sig uint32)

 //go:noescape
 func sys_umtx_op(addr *uint32, mode int32, val uint32, uaddr1 uintptr, ut *umtx_time) int32

 func osyield()

 // From FreeBSD's <sys/sysctl.h>
 const (
 	_CTL_HW      = 6
 	_HW_PAGESIZE = 7
 )

 var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}

 // Undocumented numbers from FreeBSD's lib/libc/gen/sysctlnametomib.c.
 const (
 	_CTL_QUERY     = 0
 	_CTL_QUERY_MIB = 3
 )

 // sysctlnametomib fill mib with dynamically assigned sysctl entries of name,
 // return count of effected mib slots, return 0 on error.
 func sysctlnametomib(name []byte, mib *[_CTL_MAXNAME]uint32) uint32 {
 	oid := [2]uint32{_CTL_QUERY, _CTL_QUERY_MIB}
 	miblen := uintptr(_CTL_MAXNAME)
 	if sysctl(&oid[0], 2, (*byte)(unsafe.Pointer(mib)), &miblen, (*byte)(unsafe.Pointer(&name[0])), (uintptr)(len(name))) < 0 {
 		return 0
 	}
 	miblen /= unsafe.Sizeof(uint32(0))
 	if miblen <= 0 {
 		return 0
 	}
 	return uint32(miblen)
 }

 const (
 	_CPU_CURRENT_PID = -1 // Current process ID.
 )

 //go:noescape
 func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32

 //go:systemstack
 func getncpu() int32 {
 	// Use a large buffer for the CPU mask. We're on the system
 	// stack, so this is fine, and we can't allocate memory for a
 	// dynamically-sized buffer at this point.
 	const maxCPUs = 64 * 1024
 	var mask [maxCPUs / 8]byte
 	var mib [_CTL_MAXNAME]uint32

 	// According to FreeBSD's /usr/src/sys/kern/kern_cpuset.c,
 	// cpuset_getaffinity return ERANGE when provided buffer size exceed the limits in kernel.
 	// Querying kern.smp.maxcpus to calculate maximum buffer size.
 	// See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200802

 	// Variable kern.smp.maxcpus introduced at Dec 23 2003, revision 123766,
 	// with dynamically assigned sysctl entries.
 	miblen := sysctlnametomib([]byte("kern.smp.maxcpus"), &mib)
 	if miblen == 0 {
 		return 1
 	}

 	// Query kern.smp.maxcpus.
 	dstsize := uintptr(4)
 	maxcpus := uint32(0)
 	if sysctl(&mib[0], miblen, (*byte)(unsafe.Pointer(&maxcpus)), &dstsize, nil, 0) != 0 {
 		return 1
 	}

 	maskSize := int(maxcpus+7) / 8
 	if maskSize < sys.PtrSize {
 		maskSize = sys.PtrSize
 	}
 	if maskSize > len(mask) {
 		maskSize = len(mask)
 	}

 	if cpuset_getaffinity(_CPU_LEVEL_WHICH, _CPU_WHICH_PID, _CPU_CURRENT_PID,
 		maskSize, (*byte)(unsafe.Pointer(&mask[0]))) != 0 {
 		return 1
 	}
 	n := int32(0)
 	for _, v := range mask[:maskSize] {
 		for v != 0 {
 			n += int32(v & 1)
 			v >>= 1
 		}
 	}
 	if n == 0 {
 		return 1
 	}
 	return n
 }

 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
 }

 // FreeBSD's umtx_op syscall is effectively the same as Linux's futex, and
 // thus the code is largely similar. See Linux implementation
 // and lock_futex.go for comments.

 //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 utp *umtx_time
 	if ns >= 0 {
 		var ut umtx_time
 		ut._clockid = _CLOCK_MONOTONIC
 		ut._timeout.set_sec(int64(timediv(ns, 1000000000, (*int32)(unsafe.Pointer(&ut._timeout.tv_nsec)))))
 		utp = &ut
 	}
 	ret := sys_umtx_op(addr, _UMTX_OP_WAIT_UINT_PRIVATE, val, unsafe.Sizeof(*utp), utp)
 	if ret >= 0 || ret == -_EINTR {
 		return
 	}
 	print("umtx_wait addr=", addr, " val=", val, " ret=", ret, "\n")
 	*(*int32)(unsafe.Pointer(uintptr(0x1005))) = 0x1005
 }

 //go:nosplit
 func futexwakeup(addr *uint32, cnt uint32) {
 	ret := sys_umtx_op(addr, _UMTX_OP_WAKE_PRIVATE, cnt, 0, nil)
 	if ret >= 0 {
 		return
 	}

 	systemstack(func() {
 		print("umtx_wake_addr=", addr, " ret=", ret, "\n")
 	})
 }

 func thr_start()

 // 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 stk=", stk, " m=", mp, " g=", mp.g0, " thr_start=", funcPC(thr_start), " id=", mp.id, " ostk=", &mp, "\n")
 	}

 	// NOTE(rsc): This code is confused. stackbase is the top of the stack
 	// and is equal to stk. However, it's working, so I'm not changing it.
 	param := thrparam{
 		start_func: funcPC(thr_start),
 		arg:        unsafe.Pointer(mp),
 		stack_base: mp.g0.stack.hi,
 		stack_size: uintptr(stk) - mp.g0.stack.hi,
 		child_tid:  unsafe.Pointer(&mp.procid),
 		parent_tid: nil,
 		tls_base:   unsafe.Pointer(&mp.tls[0]),
 		tls_size:   unsafe.Sizeof(mp.tls),
 	}

 	var oset sigset
 	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
 	// TODO: Check for error.
 	thr_new(&param, int32(unsafe.Sizeof(param)))
 	sigprocmask(_SIG_SETMASK, &oset, nil)
 }

 func osinit() {
 	ncpu = getncpu()
 	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() {
 	// m.procid is a uint64, but thr_new writes a uint32 on 32-bit systems.
 	// Fix it up. (Only matters on big-endian, but be clean anyway.)
 	if sys.PtrSize == 4 {
 		_g_ := getg()
 		_g_.m.procid = uint64(*(*uint32)(unsafe.Pointer(&_g_.m.procid)))
 	}

 	// On FreeBSD before about April 2017 there was a bug such
 	// that calling execve from a thread other than the main
 	// thread did not reset the signal stack. That would confuse
 	// minitSignals, which calls minitSignalStack, which checks
 	// whether there is currently a signal stack and uses it if
 	// present. To avoid this confusion, explicitly disable the
 	// signal stack on the main thread when not running in a
 	// library. This can be removed when we are confident that all
 	// FreeBSD users are running a patched kernel. See issue #15658.
 	if gp := getg(); !isarchive && !islibrary && gp.m == &m0 && gp == gp.m.g0 {
 		st := stackt{ss_flags: _SS_DISABLE}
 		sigaltstack(&st, nil)
 	}

 	minitSignals()
 }

 // Called from dropm to undo the effect of an minit.
 //go:nosplit
 func unminit() {
 	unminitSignals()
 }

 func memlimit() uintptr {
 	/*
 		TODO: Convert to Go when something actually uses the result.
 		Rlimit rl;
 		extern byte runtime·text[], runtime·end[];
 		uintptr used;

 		if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
 			return 0;
 		if(rl.rlim_cur >= 0x7fffffff)
 			return 0;

 		// Estimate our VM footprint excluding the heap.
 		// Not an exact science: use size of binary plus
 		// some room for thread stacks.
 		used = runtime·end - runtime·text + (64<<20);
 		if(used >= rl.rlim_cur)
 			return 0;

 		// If there's not at least 16 MB left, we're probably
 		// not going to be able to do much. Treat as no limit.
 		rl.rlim_cur -= used;
 		if(rl.rlim_cur < (16<<20))
 			return 0;

 		return rl.rlim_cur - used;
 	*/

 	return 0
 }

 func sigtramp()

 type sigactiont struct {
 	sa_handler 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 == funcPC(sighandler) {
 		fn = funcPC(sigtramp)
 	}
 	sa.sa_handler = 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_handler
 }

 // 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)
 }

 func (c *sigctxt) fixsigcode(sig uint32) {
 }
	// Copyright 2011 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/sys"
	"unsafe"
	)

	type mOS struct{}

	//go:noescape
	func thr_new(param *thrparam, size 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

	//go:noescape
	func getrlimit(kind int32, limit unsafe.Pointer) int32
	func raise(sig uint32)
	func raiseproc(sig uint32)

	//go:noescape
	func sys_umtx_op(addr uint32, mode int32, val uint32, uaddr1 uintptr, ut umtx_time) int32

	func osyield()

	// From FreeBSD's <sys/sysctl.h>
	const (
	_CTL_HW = 6
	_HW_PAGESIZE = 7
	)

	var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}

	// Undocumented numbers from FreeBSD's lib/libc/gen/sysctlnametomib.c.
	const (
	_CTL_QUERY = 0
	_CTL_QUERY_MIB = 3
	)

	// sysctlnametomib fill mib with dynamically assigned sysctl entries of name,
	// return count of effected mib slots, return 0 on error.
	func sysctlnametomib(name []byte, mib *[_CTL_MAXNAME]uint32) uint32 {
	oid := [2]uint32{_CTL_QUERY, _CTL_QUERY_MIB}
	miblen := uintptr(_CTL_MAXNAME)
	if sysctl(&oid[0], 2, (byte)(unsafe.Pointer(mib)), &miblen, (byte)(unsafe.Pointer(&name[0])), (uintptr)(len(name))) < 0 {
	return 0
	}
	miblen /= unsafe.Sizeof(uint32(0))
	if miblen <= 0 {
	return 0
	}
	return uint32(miblen)
	}

	const (
	_CPU_CURRENT_PID = -1 // Current process ID.
	)

	//go:noescape
	func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32

	//go:systemstack
	func getncpu() int32 {
	// Use a large buffer for the CPU mask. We're on the system
	// stack, so this is fine, and we can't allocate memory for a
	// dynamically-sized buffer at this point.
	const maxCPUs = 64 * 1024
	var mask [maxCPUs / 8]byte
	var mib [_CTL_MAXNAME]uint32

	// According to FreeBSD's /usr/src/sys/kern/kern_cpuset.c,
	// cpuset_getaffinity return ERANGE when provided buffer size exceed the limits in kernel.
	// Querying kern.smp.maxcpus to calculate maximum buffer size.
	// See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200802

	// Variable kern.smp.maxcpus introduced at Dec 23 2003, revision 123766,
	// with dynamically assigned sysctl entries.
	miblen := sysctlnametomib([]byte("kern.smp.maxcpus"), &mib)
	if miblen == 0 {
	return 1
	}

	// Query kern.smp.maxcpus.
	dstsize := uintptr(4)
	maxcpus := uint32(0)
	if sysctl(&mib[0], miblen, (*byte)(unsafe.Pointer(&maxcpus)), &dstsize, nil, 0) != 0 {
	return 1
	}

	maskSize := int(maxcpus+7) / 8
	if maskSize < sys.PtrSize {
	maskSize = sys.PtrSize
	}
	if maskSize > len(mask) {
	maskSize = len(mask)
	}

	if cpuset_getaffinity(_CPU_LEVEL_WHICH, _CPU_WHICH_PID, _CPU_CURRENT_PID,
	maskSize, (*byte)(unsafe.Pointer(&mask[0]))) != 0 {
	return 1
	}
	n := int32(0)
	for _, v := range mask[:maskSize] {
	for v != 0 {
	n += int32(v & 1)
	v >>= 1
	}
	}
	if n == 0 {
	return 1
	}
	return n
	}

	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
	}

	// FreeBSD's umtx_op syscall is effectively the same as Linux's futex, and
	// thus the code is largely similar. See Linux implementation
	// and lock_futex.go for comments.

	//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 utp *umtx_time
	if ns >= 0 {
	var ut umtx_time
	ut._clockid = _CLOCK_MONOTONIC
	ut._timeout.set_sec(int64(timediv(ns, 1000000000, (*int32)(unsafe.Pointer(&ut._timeout.tv_nsec)))))
	utp = &ut
	}
	ret := sys_umtx_op(addr, _UMTX_OP_WAIT_UINT_PRIVATE, val, unsafe.Sizeof(*utp), utp)
	if ret >= 0 \|\| ret == -_EINTR {
	return
	}
	print("umtx_wait addr=", addr, " val=", val, " ret=", ret, "\n")
	(int32)(unsafe.Pointer(uintptr(0x1005))) = 0x1005
	}

	//go:nosplit
	func futexwakeup(addr *uint32, cnt uint32) {
	ret := sys_umtx_op(addr, _UMTX_OP_WAKE_PRIVATE, cnt, 0, nil)
	if ret >= 0 {
	return
	}

	systemstack(func() {
	print("umtx_wake_addr=", addr, " ret=", ret, "\n")
	})
	}

	func thr_start()

	// 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 stk=", stk, " m=", mp, " g=", mp.g0, " thr_start=", funcPC(thr_start), " id=", mp.id, " ostk=", &mp, "\n")
	}

	// NOTE(rsc): This code is confused. stackbase is the top of the stack
	// and is equal to stk. However, it's working, so I'm not changing it.
	param := thrparam{
	start_func: funcPC(thr_start),
	arg: unsafe.Pointer(mp),
	stack_base: mp.g0.stack.hi,
	stack_size: uintptr(stk) - mp.g0.stack.hi,
	child_tid: unsafe.Pointer(&mp.procid),
	parent_tid: nil,
	tls_base: unsafe.Pointer(&mp.tls[0]),
	tls_size: unsafe.Sizeof(mp.tls),
	}

	var oset sigset
	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
	// TODO: Check for error.
	thr_new(&param, int32(unsafe.Sizeof(param)))
	sigprocmask(_SIG_SETMASK, &oset, nil)
	}

	func osinit() {
	ncpu = getncpu()
	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() {
	// m.procid is a uint64, but thr_new writes a uint32 on 32-bit systems.
	// Fix it up. (Only matters on big-endian, but be clean anyway.)
	if sys.PtrSize == 4 {
	_g_ := getg()
	_g_.m.procid = uint64((uint32)(unsafe.Pointer(&_g_.m.procid)))
	}

	// On FreeBSD before about April 2017 there was a bug such
	// that calling execve from a thread other than the main
	// thread did not reset the signal stack. That would confuse
	// minitSignals, which calls minitSignalStack, which checks
	// whether there is currently a signal stack and uses it if
	// present. To avoid this confusion, explicitly disable the
	// signal stack on the main thread when not running in a
	// library. This can be removed when we are confident that all
	// FreeBSD users are running a patched kernel. See issue #15658.
	if gp := getg(); !isarchive && !islibrary && gp.m == &m0 && gp == gp.m.g0 {
	st := stackt{ss_flags: _SS_DISABLE}
	sigaltstack(&st, nil)
	}

	minitSignals()
	}

	// Called from dropm to undo the effect of an minit.
	//go:nosplit
	func unminit() {
	unminitSignals()
	}

	func memlimit() uintptr {
	/*
	TODO: Convert to Go when something actually uses the result.
	Rlimit rl;
	extern byte runtime·text[], runtime·end[];
	uintptr used;

	if(runtime·getrlimit(RLIMIT_AS, &rl) != 0)
	return 0;
	if(rl.rlim_cur >= 0x7fffffff)
	return 0;

	// Estimate our VM footprint excluding the heap.
	// Not an exact science: use size of binary plus
	// some room for thread stacks.
	used = runtime·end - runtime·text + (64<<20);
	if(used >= rl.rlim_cur)
	return 0;

	// If there's not at least 16 MB left, we're probably
	// not going to be able to do much. Treat as no limit.
	rl.rlim_cur -= used;
	if(rl.rlim_cur < (16<<20))
	return 0;

	return rl.rlim_cur - used;
	*/

	return 0
	}

	func sigtramp()

	type sigactiont struct {
	sa_handler 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 == funcPC(sighandler) {
	fn = funcPC(sigtramp)
	}
	sa.sa_handler = 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_handler
	}

	// 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)
	}

	func (c *sigctxt) fixsigcode(sig uint32) {
	}