[dev.garbage] Merge remote-tracking branch 'origin/master' into HEAD

Change-Id: I282fd9ce9db435dfd35e882a9502ab1abc185297

1 files changed, 0 insertions, 393 deletions

diff --git a/src/runtime/os1_linux.go b/src/runtime/os1_linux.go
deleted file mode 100644
index 726dd649fe..0000000000
--- a/src/runtime/os1_linux.go
+++ /dev/null
@@ -1,393 +0,0 @@
-// Copyright 2009 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"
-)
-
-// Linux futex.
-//
-//	futexsleep(uint32 *addr, uint32 val)
-//	futexwakeup(uint32 *addr)
-//
-// Futexsleep atomically checks if *addr == val and if so, sleeps on addr.
-// Futexwakeup wakes up threads sleeping on addr.
-// Futexsleep is allowed to wake up spuriously.
-
-const (
-	_FUTEX_WAIT = 0
-	_FUTEX_WAKE = 1
-)
-
-// Atomically,
-//	if(*addr == val) sleep
-// Might be woken up spuriously; that's allowed.
-// Don't sleep longer than ns; ns < 0 means forever.
-//go:nosplit
-func futexsleep(addr *uint32, val uint32, ns int64) {
-	var ts timespec
-
-	// Some Linux kernels have a bug where futex of
-	// FUTEX_WAIT returns an internal error code
-	// as an errno. Libpthread ignores the return value
-	// here, and so can we: as it says a few lines up,
-	// spurious wakeups are allowed.
-	if ns < 0 {
-		futex(unsafe.Pointer(addr), _FUTEX_WAIT, val, nil, nil, 0)
-		return
-	}
-
-	// It's difficult to live within the no-split stack limits here.
-	// On ARM and 386, a 64-bit divide invokes a general software routine
-	// that needs more stack than we can afford. So we use timediv instead.
-	// But on real 64-bit systems, where words are larger but the stack limit
-	// is not, even timediv is too heavy, and we really need to use just an
-	// ordinary machine instruction.
-	if sys.PtrSize == 8 {
-		ts.set_sec(ns / 1000000000)
-		ts.set_nsec(int32(ns % 1000000000))
-	} else {
-		ts.tv_nsec = 0
-		ts.set_sec(int64(timediv(ns, 1000000000, (*int32)(unsafe.Pointer(&ts.tv_nsec)))))
-	}
-	futex(unsafe.Pointer(addr), _FUTEX_WAIT, val, unsafe.Pointer(&ts), nil, 0)
-}
-
-// If any procs are sleeping on addr, wake up at most cnt.
-//go:nosplit
-func futexwakeup(addr *uint32, cnt uint32) {
-	ret := futex(unsafe.Pointer(addr), _FUTEX_WAKE, cnt, nil, nil, 0)
-	if ret >= 0 {
-		return
-	}
-
-	// I don't know that futex wakeup can return
-	// EAGAIN or EINTR, but if it does, it would be
-	// safe to loop and call futex again.
-	systemstack(func() {
-		print("futexwakeup addr=", addr, " returned ", ret, "\n")
-	})
-
-	*(*int32)(unsafe.Pointer(uintptr(0x1006))) = 0x1006
-}
-
-func getproccount() int32 {
-	// This buffer is huge (8 kB) but we are on the system stack
-	// and there should be plenty of space (64 kB).
-	// Also this is a leaf, so we're not holding up the memory for long.
-	// See golang.org/issue/11823.
-	// The suggested behavior here is to keep trying with ever-larger
-	// buffers, but we don't have a dynamic memory allocator at the
-	// moment, so that's a bit tricky and seems like overkill.
-	const maxCPUs = 64 * 1024
-	var buf [maxCPUs / (sys.PtrSize * 8)]uintptr
-	r := sched_getaffinity(0, unsafe.Sizeof(buf), &buf[0])
-	n := int32(0)
-	for _, v := range buf[:r/sys.PtrSize] {
-		for v != 0 {
-			n += int32(v & 1)
-			v >>= 1
-		}
-	}
-	if n == 0 {
-		n = 1
-	}
-	return n
-}
-
-// Clone, the Linux rfork.
-const (
-	_CLONE_VM             = 0x100
-	_CLONE_FS             = 0x200
-	_CLONE_FILES          = 0x400
-	_CLONE_SIGHAND        = 0x800
-	_CLONE_PTRACE         = 0x2000
-	_CLONE_VFORK          = 0x4000
-	_CLONE_PARENT         = 0x8000
-	_CLONE_THREAD         = 0x10000
-	_CLONE_NEWNS          = 0x20000
-	_CLONE_SYSVSEM        = 0x40000
-	_CLONE_SETTLS         = 0x80000
-	_CLONE_PARENT_SETTID  = 0x100000
-	_CLONE_CHILD_CLEARTID = 0x200000
-	_CLONE_UNTRACED       = 0x800000
-	_CLONE_CHILD_SETTID   = 0x1000000
-	_CLONE_STOPPED        = 0x2000000
-	_CLONE_NEWUTS         = 0x4000000
-	_CLONE_NEWIPC         = 0x8000000
-
-	cloneFlags = _CLONE_VM | /* share memory */
-		_CLONE_FS | /* share cwd, etc */
-		_CLONE_FILES | /* share fd table */
-		_CLONE_SIGHAND | /* share sig handler table */
-		_CLONE_THREAD /* revisit - okay for now */
-)
-
-// May run with m.p==nil, so write barriers are not allowed.
-//go:nowritebarrier
-func newosproc(mp *m, stk unsafe.Pointer) {
-	/*
-	 * note: strace gets confused if we use CLONE_PTRACE here.
-	 */
-	if false {
-		print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " clone=", funcPC(clone), " id=", mp.id, " ostk=", &mp, "\n")
-	}
-
-	// Disable signals during clone, so that the new thread starts
-	// with signals disabled. It will enable them in minit.
-	var oset sigset
-	rtsigprocmask(_SIG_SETMASK, &sigset_all, &oset, int32(unsafe.Sizeof(oset)))
-	ret := clone(cloneFlags, stk, unsafe.Pointer(mp), unsafe.Pointer(mp.g0), unsafe.Pointer(funcPC(mstart)))
-	rtsigprocmask(_SIG_SETMASK, &oset, nil, int32(unsafe.Sizeof(oset)))
-
-	if ret < 0 {
-		print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", -ret, ")\n")
-		throw("newosproc")
-	}
-}
-
-// Version of newosproc that doesn't require a valid G.
-//go:nosplit
-func newosproc0(stacksize uintptr, fn unsafe.Pointer) {
-	stack := sysAlloc(stacksize, &memstats.stacks_sys)
-	if stack == nil {
-		write(2, unsafe.Pointer(&failallocatestack[0]), int32(len(failallocatestack)))
-		exit(1)
-	}
-	ret := clone(cloneFlags, unsafe.Pointer(uintptr(stack)+stacksize), nil, nil, fn)
-	if ret < 0 {
-		write(2, unsafe.Pointer(&failthreadcreate[0]), int32(len(failthreadcreate)))
-		exit(1)
-	}
-}
-
-var failallocatestack = []byte("runtime: failed to allocate stack for the new OS thread\n")
-var failthreadcreate = []byte("runtime: failed to create new OS thread\n")
-
-func osinit() {
-	ncpu = getproccount()
-}
-
-var urandom_dev = []byte("/dev/urandom\x00")
-
-func getRandomData(r []byte) {
-	if startupRandomData != nil {
-		n := copy(r, startupRandomData)
-		extendRandom(r, n)
-		return
-	}
-	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 do synchronous initialization of Go code built with
-// -buildmode=c-archive or -buildmode=c-shared.
-// None of the Go runtime is initialized.
-//go:nosplit
-//go:nowritebarrierrec
-func libpreinit() {
-	initsig(true)
-}
-
-// 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) // Linux wants >= 2K
-	mp.gsignal.m = mp
-}
-
-//go:nosplit
-func msigsave(mp *m) {
-	smask := &mp.sigmask
-	rtsigprocmask(_SIG_SETMASK, nil, smask, int32(unsafe.Sizeof(*smask)))
-}
-
-//go:nosplit
-func msigrestore(sigmask sigset) {
-	rtsigprocmask(_SIG_SETMASK, &sigmask, nil, int32(unsafe.Sizeof(sigmask)))
-}
-
-//go:nosplit
-func sigblock() {
-	rtsigprocmask(_SIG_SETMASK, &sigset_all, nil, int32(unsafe.Sizeof(sigset_all)))
-}
-
-func gettid() uint32
-
-// Called to initialize a new m (including the bootstrap m).
-// Called on the new thread, cannot allocate memory.
-func minit() {
-	// Initialize signal handling.
-	_g_ := getg()
-
-	var st sigaltstackt
-	sigaltstack(nil, &st)
-	if st.ss_flags&_SS_DISABLE != 0 {
-		signalstack(&_g_.m.gsignal.stack)
-		_g_.m.newSigstack = true
-	} else {
-		// Use existing signal stack.
-		stsp := uintptr(unsafe.Pointer(st.ss_sp))
-		_g_.m.gsignal.stack.lo = stsp
-		_g_.m.gsignal.stack.hi = stsp + st.ss_size
-		_g_.m.gsignal.stackguard0 = stsp + _StackGuard
-		_g_.m.gsignal.stackguard1 = stsp + _StackGuard
-		_g_.m.gsignal.stackAlloc = st.ss_size
-		_g_.m.newSigstack = false
-	}
-
-	// for debuggers, in case cgo created the thread
-	_g_.m.procid = uint64(gettid())
-
-	// restore signal mask from m.sigmask and unblock essential signals
-	nmask := _g_.m.sigmask
-	for i := range sigtable {
-		if sigtable[i].flags&_SigUnblock != 0 {
-			sigdelset(&nmask, i)
-		}
-	}
-	rtsigprocmask(_SIG_SETMASK, &nmask, nil, int32(unsafe.Sizeof(nmask)))
-}
-
-// Called from dropm to undo the effect of an minit.
-//go:nosplit
-func unminit() {
-	if getg().m.newSigstack {
-		signalstack(nil)
-	}
-}
-
-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
-}
-
-//#ifdef GOARCH_386
-//#define sa_handler k_sa_handler
-//#endif
-
-func sigreturn()
-func sigtramp()
-func cgoSigtramp()
-
-//go:nosplit
-//go:nowritebarrierrec
-func setsig(i int32, fn uintptr, restart bool) {
-	var sa sigactiont
-	memclr(unsafe.Pointer(&sa), unsafe.Sizeof(sa))
-	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTORER
-	if restart {
-		sa.sa_flags |= _SA_RESTART
-	}
-	sigfillset(&sa.sa_mask)
-	// Although Linux manpage says "sa_restorer element is obsolete and
-	// should not be used". x86_64 kernel requires it. Only use it on
-	// x86.
-	if GOARCH == "386" || GOARCH == "amd64" {
-		sa.sa_restorer = funcPC(sigreturn)
-	}
-	if fn == funcPC(sighandler) {
-		if iscgo {
-			fn = funcPC(cgoSigtramp)
-		} else {
-			fn = funcPC(sigtramp)
-		}
-	}
-	sa.sa_handler = fn
-	rt_sigaction(uintptr(i), &sa, nil, unsafe.Sizeof(sa.sa_mask))
-}
-
-//go:nosplit
-//go:nowritebarrierrec
-func setsigstack(i int32) {
-	var sa sigactiont
-	if rt_sigaction(uintptr(i), nil, &sa, unsafe.Sizeof(sa.sa_mask)) != 0 {
-		throw("rt_sigaction failure")
-	}
-	if sa.sa_handler == 0 || sa.sa_handler == _SIG_DFL || sa.sa_handler == _SIG_IGN || sa.sa_flags&_SA_ONSTACK != 0 {
-		return
-	}
-	sa.sa_flags |= _SA_ONSTACK
-	if rt_sigaction(uintptr(i), &sa, nil, unsafe.Sizeof(sa.sa_mask)) != 0 {
-		throw("rt_sigaction failure")
-	}
-}
-
-//go:nosplit
-//go:nowritebarrierrec
-func getsig(i int32) uintptr {
-	var sa sigactiont
-
-	memclr(unsafe.Pointer(&sa), unsafe.Sizeof(sa))
-	if rt_sigaction(uintptr(i), nil, &sa, unsafe.Sizeof(sa.sa_mask)) != 0 {
-		throw("rt_sigaction read failure")
-	}
-	if sa.sa_handler == funcPC(sigtramp) || sa.sa_handler == funcPC(cgoSigtramp) {
-		return funcPC(sighandler)
-	}
-	return sa.sa_handler
-}
-
-//go:nosplit
-func signalstack(s *stack) {
-	var st sigaltstackt
-	if s == nil {
-		st.ss_flags = _SS_DISABLE
-	} else {
-		st.ss_sp = (*byte)(unsafe.Pointer(s.lo))
-		st.ss_size = s.hi - s.lo
-		st.ss_flags = 0
-	}
-	sigaltstack(&st, nil)
-}
-
-//go:nosplit
-//go:nowritebarrierrec
-func updatesigmask(m sigmask) {
-	var mask sigset
-	sigcopyset(&mask, m)
-	rtsigprocmask(_SIG_SETMASK, &mask, nil, int32(unsafe.Sizeof(mask)))
-}
-
-func unblocksig(sig int32) {
-	var mask sigset
-	sigaddset(&mask, int(sig))
-	rtsigprocmask(_SIG_UNBLOCK, &mask, nil, int32(unsafe.Sizeof(mask)))
-}