Modifications towards full ipc

- Added a full ipc send/recv test
- Removed non-zero value checking in r2 for ipc that was there
  to catch inadvertent full ipc calls.
- Added correct hanlding for read/write mrs for current status of utcb.

TODO:
- Add mapping of every utcb to every task for privileged access so that
  the kernel can access every utcb without switching spaces.
- Removal of same mappings
- Upon thread creation need to copy page tables accordingly i.e.
  each task will have its own utcb mapped with USER access, but every
  other utcb as kernel access only. Need to handle this case upon page
  table copying.

src/api/ipc.c

@@ -353,6 +353,11 @@ int sys_ipc(syscall_context_t *regs)
 	unsigned int ipc_type = 0;
 	int ret = 0;
 
+	if (regs->r2)
+		__asm__ __volatile__ (
+				"1:\n"
+				"b 1b\n");
+
 	/* Check arguments */
 	if (from < L4_ANYTHREAD) {
 		ret = -EINVAL;

src/arch/arm/exception.c

@@ -18,7 +18,7 @@
 #include INC_SUBARCH(mm.h)
 
 /* Abort debugging conditions */
-// #define DEBUG_ABORTS
+ #define DEBUG_ABORTS
 #if defined (DEBUG_ABORTS)
 #define dbg_abort(...)	dprintk(__VA_ARGS__)
 #else