// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import (
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"runtime/internal/atomic"
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"runtime/internal/sys"
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"unsafe"
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)
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const (
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_SS_DISABLE = 4
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_SIG_BLOCK = 1
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_SIG_UNBLOCK = 2
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_SIG_SETMASK = 3
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_NSIG = 33
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_SI_USER = 0
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// From NetBSD's <sys/ucontext.h>
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_UC_SIGMASK = 0x01
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_UC_CPU = 0x04
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// From <sys/lwp.h>
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_LWP_DETACHED = 0x00000040
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_EAGAIN = 35
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)
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type mOS struct {
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waitsemacount uint32
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}
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//go:noescape
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func setitimer(mode int32, new, old *itimerval)
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//go:noescape
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func sigaction(sig uint32, new, old *sigactiont)
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//go:noescape
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func sigaltstack(new, old *stackt)
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//go:noescape
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func sigprocmask(how int32, new, old *sigset)
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//go:noescape
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func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
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func lwp_tramp()
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func raise(sig uint32)
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func raiseproc(sig uint32)
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//go:noescape
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func getcontext(ctxt unsafe.Pointer)
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//go:noescape
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func lwp_create(ctxt unsafe.Pointer, flags uintptr, lwpid unsafe.Pointer) int32
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//go:noescape
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func lwp_park(clockid, flags int32, ts *timespec, unpark int32, hint, unparkhint unsafe.Pointer) int32
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//go:noescape
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func lwp_unpark(lwp int32, hint unsafe.Pointer) int32
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func lwp_self() int32
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func osyield()
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func kqueue() int32
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//go:noescape
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func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32
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func closeonexec(fd int32)
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const (
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_ESRCH = 3
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_ETIMEDOUT = 60
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// From NetBSD's <sys/time.h>
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_CLOCK_REALTIME = 0
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_CLOCK_VIRTUAL = 1
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_CLOCK_PROF = 2
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_CLOCK_MONOTONIC = 3
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_TIMER_RELTIME = 0
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_TIMER_ABSTIME = 1
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)
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var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}
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// From NetBSD's <sys/sysctl.h>
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const (
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_CTL_HW = 6
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_HW_NCPU = 3
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_HW_PAGESIZE = 7
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)
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func getncpu() int32 {
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mib := [2]uint32{_CTL_HW, _HW_NCPU}
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out := uint32(0)
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nout := unsafe.Sizeof(out)
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ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
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if ret >= 0 {
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return int32(out)
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}
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return 1
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}
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func getPageSize() uintptr {
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mib := [2]uint32{_CTL_HW, _HW_PAGESIZE}
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out := uint32(0)
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nout := unsafe.Sizeof(out)
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ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
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if ret >= 0 {
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return uintptr(out)
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}
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return 0
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}
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//go:nosplit
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func semacreate(mp *m) {
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}
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//go:nosplit
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func semasleep(ns int64) int32 {
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_g_ := getg()
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var deadline int64
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if ns >= 0 {
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deadline = nanotime() + ns
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}
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for {
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v := atomic.Load(&_g_.m.waitsemacount)
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if v > 0 {
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if atomic.Cas(&_g_.m.waitsemacount, v, v-1) {
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return 0 // semaphore acquired
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}
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continue
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}
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// Sleep until unparked by semawakeup or timeout.
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var tsp *timespec
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var ts timespec
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if ns >= 0 {
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wait := deadline - nanotime()
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if wait <= 0 {
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return -1
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}
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var nsec int32
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ts.set_sec(timediv(wait, 1000000000, &nsec))
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ts.set_nsec(nsec)
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tsp = &ts
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}
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ret := lwp_park(_CLOCK_MONOTONIC, _TIMER_RELTIME, tsp, 0, unsafe.Pointer(&_g_.m.waitsemacount), nil)
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if ret == _ETIMEDOUT {
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return -1
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}
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}
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}
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//go:nosplit
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func semawakeup(mp *m) {
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atomic.Xadd(&mp.waitsemacount, 1)
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// From NetBSD's _lwp_unpark(2) manual:
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// "If the target LWP is not currently waiting, it will return
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// immediately upon the next call to _lwp_park()."
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ret := lwp_unpark(int32(mp.procid), unsafe.Pointer(&mp.waitsemacount))
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if ret != 0 && ret != _ESRCH {
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// semawakeup can be called on signal stack.
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systemstack(func() {
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print("thrwakeup addr=", &mp.waitsemacount, " sem=", mp.waitsemacount, " ret=", ret, "\n")
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})
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}
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}
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// May run with m.p==nil, so write barriers are not allowed.
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//go:nowritebarrier
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func newosproc(mp *m) {
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stk := unsafe.Pointer(mp.g0.stack.hi)
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if false {
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print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n")
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}
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var uc ucontextt
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getcontext(unsafe.Pointer(&uc))
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// _UC_SIGMASK does not seem to work here.
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// It would be nice if _UC_SIGMASK and _UC_STACK
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// worked so that we could do all the work setting
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// the sigmask and the stack here, instead of setting
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// the mask here and the stack in netbsdMstart.
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// For now do the blocking manually.
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uc.uc_flags = _UC_SIGMASK | _UC_CPU
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uc.uc_link = nil
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uc.uc_sigmask = sigset_all
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var oset sigset
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sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
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lwp_mcontext_init(&uc.uc_mcontext, stk, mp, mp.g0, funcPC(netbsdMstart))
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ret := lwp_create(unsafe.Pointer(&uc), _LWP_DETACHED, unsafe.Pointer(&mp.procid))
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sigprocmask(_SIG_SETMASK, &oset, nil)
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if ret < 0 {
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print("runtime: failed to create new OS thread (have ", mcount()-1, " already; errno=", -ret, ")\n")
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if ret == -_EAGAIN {
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println("runtime: may need to increase max user processes (ulimit -p)")
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}
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throw("runtime.newosproc")
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}
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}
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// netbsdMStart is the function call that starts executing a newly
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// created thread. On NetBSD, a new thread inherits the signal stack
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// of the creating thread. That confuses minit, so we remove that
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// signal stack here before calling the regular mstart. It's a bit
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// baroque to remove a signal stack here only to add one in minit, but
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// it's a simple change that keeps NetBSD working like other OS's.
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// At this point all signals are blocked, so there is no race.
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//go:nosplit
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func netbsdMstart() {
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st := stackt{ss_flags: _SS_DISABLE}
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sigaltstack(&st, nil)
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mstart()
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}
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func osinit() {
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ncpu = getncpu()
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if physPageSize == 0 {
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physPageSize = getPageSize()
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}
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}
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var urandom_dev = []byte("/dev/urandom\x00")
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//go:nosplit
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func getRandomData(r []byte) {
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fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
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n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
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closefd(fd)
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extendRandom(r, int(n))
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}
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func goenvs() {
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goenvs_unix()
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}
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// Called to initialize a new m (including the bootstrap m).
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// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
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func mpreinit(mp *m) {
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mp.gsignal = malg(32 * 1024)
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mp.gsignal.m = mp
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}
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// Called to initialize a new m (including the bootstrap m).
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// Called on the new thread, cannot allocate memory.
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func minit() {
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_g_ := getg()
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_g_.m.procid = uint64(lwp_self())
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// On NetBSD a thread created by pthread_create inherits the
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// signal stack of the creating thread. We always create a
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// new signal stack here, to avoid having two Go threads using
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// the same signal stack. This breaks the case of a thread
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// created in C that calls sigaltstack and then calls a Go
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// function, because we will lose track of the C code's
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// sigaltstack, but it's the best we can do.
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signalstack(&_g_.m.gsignal.stack)
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_g_.m.newSigstack = true
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minitSignalMask()
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}
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// Called from dropm to undo the effect of an minit.
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//go:nosplit
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func unminit() {
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unminitSignals()
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}
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func sigtramp()
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type sigactiont struct {
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sa_sigaction uintptr
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sa_mask sigset
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sa_flags int32
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}
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//go:nosplit
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//go:nowritebarrierrec
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func setsig(i uint32, fn uintptr) {
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var sa sigactiont
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sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
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sa.sa_mask = sigset_all
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if fn == funcPC(sighandler) {
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fn = funcPC(sigtramp)
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}
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sa.sa_sigaction = fn
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sigaction(i, &sa, nil)
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}
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//go:nosplit
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//go:nowritebarrierrec
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func setsigstack(i uint32) {
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throw("setsigstack")
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}
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//go:nosplit
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//go:nowritebarrierrec
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func getsig(i uint32) uintptr {
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var sa sigactiont
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sigaction(i, nil, &sa)
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return sa.sa_sigaction
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}
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// setSignaltstackSP sets the ss_sp field of a stackt.
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//go:nosplit
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func setSignalstackSP(s *stackt, sp uintptr) {
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s.ss_sp = sp
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}
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//go:nosplit
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//go:nowritebarrierrec
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func sigaddset(mask *sigset, i int) {
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mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
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}
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func sigdelset(mask *sigset, i int) {
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mask.__bits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
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}
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func (c *sigctxt) fixsigcode(sig uint32) {
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}
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func sysargs(argc int32, argv **byte) {
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n := argc + 1
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// skip over argv, envp to get to auxv
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for argv_index(argv, n) != nil {
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n++
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}
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// skip NULL separator
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n++
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// now argv+n is auxv
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auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*sys.PtrSize))
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sysauxv(auxv[:])
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}
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const (
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_AT_NULL = 0 // Terminates the vector
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_AT_PAGESZ = 6 // Page size in bytes
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)
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func sysauxv(auxv []uintptr) {
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for i := 0; auxv[i] != _AT_NULL; i += 2 {
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tag, val := auxv[i], auxv[i+1]
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switch tag {
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case _AT_PAGESZ:
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physPageSize = val
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}
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}
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}
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