nintendoswitch: Add experimental Nintendo Switch support without CRT

Bare minimal nintendo switch support using LLD

src/syscall/syscall_libc.go

@@ -1,4 +1,4 @@
-// +build darwin
+// +build darwin nintendoswitch
 
 package syscall
 

src/syscall/syscall_nintendoswitch.go

@@ -0,0 +1,48 @@
+// +build nintendoswitch
+
+package syscall
+
+import "errors"
+
+// A Signal is a number describing a process signal.
+// It implements the os.Signal interface.
+type Signal int
+
+const (
+	_ Signal = iota
+	SIGCHLD
+	SIGINT
+	SIGKILL
+	SIGTRAP
+	SIGQUIT
+	SIGTERM
+)
+
+// File system
+
+const (
+	Stdin  = 0
+	Stdout = 1
+	Stderr = 2
+)
+
+const (
+	O_RDONLY = 0
+	O_WRONLY = 1
+	O_RDWR   = 2
+
+	O_CREAT  = 0100
+	O_CREATE = O_CREAT
+	O_TRUNC  = 01000
+	O_APPEND = 02000
+	O_EXCL   = 0200
+	O_SYNC   = 010000
+
+	O_CLOEXEC = 0
+)
+
+var dummyError = errors.New("unknown syscall error")
+
+func getErrno() error {
+	return dummyError
+}

src/syscall/tables_baremetal.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 baremetal
+// +build baremetal nintendoswitch
 
 package syscall