sh: use new common trampoline

arch/sh/defs.h

@@ -12,6 +12,9 @@
 #define REG_MACH		(20)
 #define REG_MACL		(21)
 
+#define FETCH_LINKPTR(dest)	\
+	asm("mov r8, %0" : "=rm" (dest));
+
 #include "common-defs.h"
 
 #endif

arch/sh/trampoline.c

@@ -1,28 +1,2 @@
-/*
- * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * This software is provided 'as is' and without any warranty, express or
- * implied.  In no event shall the authors be liable for any damages arising
- * from the use of this software.
- */
-
-#include <stddef.h>
-#include <stdlib.h>
 #include "defs.h"
-
-void
-libucontext_trampoline(void)
-{
-	libucontext_ucontext_t *uc_link;
-
-	asm("mov r8, %0" : "=r" (uc_link));
-
-	if (uc_link == NULL)
-		exit(0);
-
-	libucontext_setcontext(uc_link);
-}
+#include "common-trampoline.c"