From ccd992355df7192993c666236047820244914598 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:19:13 +0200 Subject: Adding upstream version 1.21.8. Signed-off-by: Daniel Baumann --- src/runtime/os_dragonfly.go | 344 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 344 insertions(+) create mode 100644 src/runtime/os_dragonfly.go (limited to 'src/runtime/os_dragonfly.go') diff --git a/src/runtime/os_dragonfly.go b/src/runtime/os_dragonfly.go new file mode 100644 index 0000000..8268c7f --- /dev/null +++ b/src/runtime/os_dragonfly.go @@ -0,0 +1,344 @@ +// 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 +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") +} -- cgit v1.2.3