Initial commit

tasks/mm0/src/stack.c

@@ -0,0 +1,28 @@
+
+#include <l4/config.h>
+#include <l4/macros.h>
+#include <l4/types.h>
+#include INC_GLUE(memlayout.h)
+#include <string.h>
+
+/* The initial temporary stack used until memory is set up */
+__attribute__ ((section("init.stack"))) char stack[4096];
+extern unsigned long __stack[];		/* Linker defined */
+
+/* Moves from temporary stack to where it should be in actual. */
+void move_stack()
+{
+	register unsigned int sp asm("sp");
+	register unsigned int fp asm("r11");
+
+	unsigned int stack_offset = (unsigned long)__stack - sp;
+	unsigned int frame_offset = (unsigned long)__stack - fp;
+
+	/* Copy current stack into new stack. NOTE: This might demand-page
+	 * the new stack, but maybe that won't work. */
+	memcpy((void *)USER_AREA_END, __stack, stack_offset);
+	sp = USER_AREA_END - stack_offset;
+	fp = USER_AREA_END - frame_offset;
+
+}
+