| // 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 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 |
| } |
| |
| // 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") |
| } |