Initial revision of ARM simulator and (empty) MIPS simulator.

runtime/vm/os_win.cc

Index: runtime/vm/os_win.cc
===================================================================
--- runtime/vm/os_win.cc	(revision 17504)
+++ runtime/vm/os_win.cc	(working copy)
@@ -158,6 +158,11 @@
 }
 
 
+void OS::DebugBreak() {
+  UNIMPLEMENTED();

[Ivan Posva, 2013/01/24 18:25:57]

http://msdn.microsoft.com/en-us/library/windows/desktop/ms679297(v=vs.85).aspx

[regis, 2013/01/24 21:47:48]

I had already checked this one:
http://msdn.microsoft.com/en-us/library/f408b4et.aspx

+}
+
+
 void OS::Print(const char* format, ...) {
   va_list args;
   va_start(args, format);
@@ -248,6 +253,10 @@
 }
 
 
+// Cache the null page size.
+uword OS::null_page_size_ = 0;
+
+
 void OS::InitOnce() {
   // TODO(5411554): For now we check that initonce is called only once,
   // Once there is more formal mechanism to call InitOnce we can move
@@ -257,6 +266,9 @@
   init_once_called = true;
   // Do not pop up a message box when abort is called.
   _set_abort_behavior(0, _WRITE_ABORT_MSG);
+
+  // Initialize the null page size.
+  null_page_size_ = 4096;  // TODO(regis): Retrieve the actual value.
 }