align GOOS=tamago support to go1.14

src/cmd/dist/build.go

@@ -1556,10 +1556,10 @@ var cgoEnabled = map[string]bool{
 	"plan9/amd64":     false,
 	"plan9/arm":       false,
 	"solaris/amd64":   true,
+	"tamago/arm":      true,
 	"windows/386":     true,
 	"windows/amd64":   true,
 	"windows/arm":     false,
-	"tamago/arm":      true,
 }
 
 // List of platforms which are supported but not complete yet. These get

src/cmd/dist/util.go

@@ -383,6 +383,10 @@ func xsamefile(f1, f2 string) bool {
 }
 
 func xgetgoarm() string {
+	if goos == "tamago" {
+		// tamago guarantees VFPv3 and is always cross-compiled.
+		return "7"
+	}
 	if goos == "darwin" || goos == "android" {
 		// Assume all darwin/arm and android devices have VFPv3.
 		// These ports are also mostly cross-compiled, so it makes little

src/internal/poll/fcntl_tamago.go

@@ -0,0 +1,14 @@
+// Copyright 2019 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.
+
+// +build tamago
+
+package poll
+
+import "syscall"
+
+// fcntl not supported on tamago
+func fcntl(fd int, cmd int, arg int) (int, error) {
+	return 0, syscall.ENOSYS
+}

src/os/stat_js.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build js,wasm tamago
+// +build js,wasm
 
 package os
 

src/os/stat_tamago.go

@@ -0,0 +1,54 @@
+// 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.
+
+// +build tamago
+
+package os
+
+import (
+	"syscall"
+	"time"
+)
+
+func fillFileStatFromSys(fs *fileStat, name string) {
+	fs.name = basename(name)
+	fs.size = fs.sys.Size
+	fs.modTime = timespecToTime(fs.sys.Mtime, fs.sys.MtimeNsec)
+	fs.mode = FileMode(fs.sys.Mode & 0777)
+	switch fs.sys.Mode & syscall.S_IFMT {
+	case syscall.S_IFBLK:
+		fs.mode |= ModeDevice
+	case syscall.S_IFCHR:
+		fs.mode |= ModeDevice | ModeCharDevice
+	case syscall.S_IFDIR:
+		fs.mode |= ModeDir
+	case syscall.S_IFIFO:
+		fs.mode |= ModeNamedPipe
+	case syscall.S_IFLNK:
+		fs.mode |= ModeSymlink
+	case syscall.S_IFREG:
+		// nothing to do
+	case syscall.S_IFSOCK:
+		fs.mode |= ModeSocket
+	}
+	if fs.sys.Mode&syscall.S_ISGID != 0 {
+		fs.mode |= ModeSetgid
+	}
+	if fs.sys.Mode&syscall.S_ISUID != 0 {
+		fs.mode |= ModeSetuid
+	}
+	if fs.sys.Mode&syscall.S_ISVTX != 0 {
+		fs.mode |= ModeSticky
+	}
+}
+
+func timespecToTime(sec, nsec int64) time.Time {
+	return time.Unix(sec, nsec)
+}
+
+// For testing.
+func atime(fi FileInfo) time.Time {
+	st := fi.Sys().(*syscall.Stat_t)
+	return timespecToTime(st.Atime, st.AtimeNsec)
+}

src/runtime/alg.go

@@ -331,9 +331,6 @@ func alginit() {
 		initAlgAES()
 		return
 	}
-	if GOOS == "tamago" {
-		initRNG()
-	}
 	getRandomData((*[len(hashkey) * sys.PtrSize]byte)(unsafe.Pointer(&hashkey))[:])
 	hashkey[0] |= 1 // make sure these numbers are odd
 	hashkey[1] |= 1

src/runtime/lock_tamago.go

@@ -142,27 +142,9 @@ func checkTimeouts() {
 	}
 }
 
-var returnedEventHandler *g
-
-func init() {
-	// At the toplevel we need an extra goroutine that handles asynchronous events.
-	initg := getg()
-	go func() {
-		returnedEventHandler = getg()
-		goready(initg, 1)
-
-		gopark(nil, nil, waitReasonZero, traceEvNone, 1)
-		returnedEventHandler = nil
-	}()
-	gopark(nil, nil, waitReasonZero, traceEvNone, 1)
-}
-
 // beforeIdle gets called by the scheduler if no goroutine is awake.
-// We resume the event handler (if available) which will pause the execution.
-func beforeIdle() bool {
-	if returnedEventHandler != nil {
-		goready(returnedEventHandler, 1)
-		return true
-	}
+// If we are not already handling an event, then we pause for an async event.
+// If an event handler returned, we resume it and it will pause the execution.
+func beforeIdle(delay int64) bool {
 	return false
 }

src/runtime/mem_tamago.go

@@ -196,7 +196,7 @@ func sysReserve(v unsafe.Pointer, n uintptr) unsafe.Pointer {
 		// so try to extend the address space.
 		p = sbrk(n)
 	}
-	if p == nil {
+	if p == nil && v == nil {
 		p = memAlloc(n)
 		memCheck()
 	}

src/runtime/os_tamago_arm.go

@@ -50,8 +50,7 @@ func initRNG()
 
 // the following functions must be provided externally
 // (but are already stubbed somewhere else in the runtime)
-//func initRNG()
-//func nanotime() int64
+//func nanotime1() int64
 
 // the following functions are defined in sys_tamago_arm.s
 func set_vbar(addr unsafe.Pointer)
@@ -356,7 +355,7 @@ func syscall(number, a1, a2, a3 uintptr) (r1, r2, err uintptr) {
 }
 
 //go:nosplit
-func write(fd uintptr, buf unsafe.Pointer, count int32) int32 {
+func write1(fd uintptr, buf unsafe.Pointer, count int32) int32 {
 	if fd != 1 && fd != 2 {
 		throw("unexpected fd, only stdout/stderr are supported")
 	}
@@ -378,7 +377,7 @@ func syscall_now() (sec int64, nsec int32) {
 }
 
 //go:nosplit
-func walltime() (sec int64, nsec int32) {
+func walltime1() (sec int64, nsec int32) {
 	// TODO: probably better implement this in sys_tamago_arm.s for better
 	// performance
 	nano := nanotime()
@@ -409,3 +408,11 @@ func exitThread(wait *uint32) {
 	// We should never reach exitThread
 	throw("exitThread: not implemented")
 }
+
+const preemptMSupported = false
+
+func preemptM(mp *m) {
+	// Not currently supported.
+	//
+	// TODO: Use a note like we use signals on POSIX OSes
+}

src/runtime/proc.go

@@ -651,6 +651,9 @@ func mcommoninit(mp *m) {
 var fastrandseed uintptr
 
 func fastrandinit() {
+	if GOOS == "tamago" {
+		initRNG()
+	}
 	s := (*[unsafe.Sizeof(fastrandseed)]byte)(unsafe.Pointer(&fastrandseed))[:]
 	getRandomData(s)
 }