uti: Replace data types represented as arrays with C structures

Defining C structures for the following objects:
(1) Remote and local context
(2) Stack of system call arguments / return values

Change-Id: Iafbb6c795bd765e3c78c54a255d8a1e4d4536288

executer/kernel/mcctrl/arch/x86_64/archdeps.c

@@ -279,6 +279,14 @@ get_fs_ctx(void *ctx)
 	return tctx->fs;
 }
 
+unsigned long
+get_rsp_ctx(void *ctx)
+{
+	struct trans_uctx *tctx = ctx;
+
+	return tctx->rsp;
+}
+
 #ifdef POSTK_DEBUG_ARCH_DEP_83 /* arch depend translate_rva_to_rpa() move */
 int translate_rva_to_rpa(ihk_os_t os, unsigned long rpt, unsigned long rva,
 		unsigned long *rpap, unsigned long *pgsizep)