mirror of https://go.googlesource.com/go
152 lines
3.2 KiB
Go
152 lines
3.2 KiB
Go
// Copyright 2023 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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"internal/runtime/atomic"
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"unsafe"
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)
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func osinit() {
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// https://webassembly.github.io/spec/core/exec/runtime.html#memory-instances
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physPageSize = 64 * 1024
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initBloc()
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ncpu = 1
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getg().m.procid = 2
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}
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const _SIGSEGV = 0xb
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func sigpanic() {
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gp := getg()
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if !canpanic() {
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throw("unexpected signal during runtime execution")
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}
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// js only invokes the exception handler for memory faults.
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gp.sig = _SIGSEGV
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panicmem()
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}
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// func exitThread(wait *uint32)
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// FIXME: wasm doesn't have atomic yet
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func exitThread(wait *atomic.Uint32)
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type mOS struct{}
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func osyield()
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//go:nosplit
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func osyield_no_g() {
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osyield()
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}
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type sigset struct{}
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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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//go:nosplit
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func usleep_no_g(usec uint32) {
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usleep(usec)
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}
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//go:nosplit
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func sigsave(p *sigset) {
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}
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//go:nosplit
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func msigrestore(sigmask sigset) {
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}
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//go:nosplit
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//go:nowritebarrierrec
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func clearSignalHandlers() {
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}
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//go:nosplit
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func sigblock(exiting bool) {
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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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}
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// Called from dropm to undo the effect of an minit.
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func unminit() {
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}
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// Called from exitm, but not from drop, to undo the effect of thread-owned
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// resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
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func mdestroy(mp *m) {
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}
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// wasm has no signals
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const _NSIG = 0
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func signame(sig uint32) string {
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return ""
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}
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func crash() {
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*(*int32)(nil) = 0
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}
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func initsig(preinit bool) {
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}
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// May run with m.p==nil, so write barriers are not allowed.
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//
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//go:nowritebarrier
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func newosproc(mp *m) {
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throw("newosproc: not implemented")
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}
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//go:linkname os_sigpipe os.sigpipe
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func os_sigpipe() {
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throw("too many writes on closed pipe")
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}
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//go:linkname syscall_now syscall.now
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func syscall_now() (sec int64, nsec int32) {
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sec, nsec, _ = time_now()
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return
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}
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//go:nosplit
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func cputicks() int64 {
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// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
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return nanotime()
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}
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// gsignalStack is unused on js.
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type gsignalStack struct{}
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const preemptMSupported = false
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func preemptM(mp *m) {
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// No threads, so nothing to do.
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}
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// getfp returns the frame pointer register of its caller or 0 if not implemented.
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// TODO: Make this a compiler intrinsic
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func getfp() uintptr { return 0 }
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func setProcessCPUProfiler(hz int32) {}
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func setThreadCPUProfiler(hz int32) {}
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func sigdisable(uint32) {}
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func sigenable(uint32) {}
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func sigignore(uint32) {}
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// Stubs so tests can link correctly. These should never be called.
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func open(name *byte, mode, perm int32) int32 { panic("not implemented") }
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func closefd(fd int32) int32 { panic("not implemented") }
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func read(fd int32, p unsafe.Pointer, n int32) int32 { panic("not implemented") }
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