Continuations support

cores/esp8266/cont_util.c

@@ -0,0 +1,49 @@
+/////////////////////////////////////////////////////////////////////////////
+//
+//  cont_util.c: continuations support for Xtensa call0 ABI
+//  Copyright (c) Ivan Grokhotkov 2014
+//
+//  This file is licensed under MIT license
+//
+//  Permission is hereby granted, free of charge, to any person obtaining
+//  a copy of this software and associated documentation files (the
+//  "Software"), to deal in the Software without restriction, including
+//  without limitation the rights to use, copy, modify, merge, publish,
+//  distribute, sublicense, and/or sell copies of the Software, and to
+//  permit persons to whom the Software is furnished to do so, subject to
+//  the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included
+//  in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+//  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+//  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+//  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+//  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+//  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+/////////////////////////////////////////////////////////////////////////////
+
+
+#include "cont.h"
+
+#define CONT_STACKGUARD 0xfeefeffe
+
+void cont_init(cont_t* cont)
+{
+	cont->stack_guard1 = CONT_STACKGUARD;
+	cont->stack_guard2 = CONT_STACKGUARD;
+	cont->stack_end = cont->stack + (sizeof(cont->stack) / 4 - 1);
+	cont->struct_start = cont;
+}
+
+int cont_check(cont_t* cont)
+{
+	if (cont->stack_guard1 != CONT_STACKGUARD ||
+		cont->stack_guard2 != CONT_STACKGUARD )
+		return 1;
+
+	return 0;
+}