m68k: port to use common trampoline

arch/m68k/defs.h

@@ -26,6 +26,9 @@
 
 #define PC_OFFSET	REG_OFFSET(REG_PC)
 
+#define FETCH_LINKPTR(dest) \
+	asm("mov.l (%%sp, %%d7.l * 4), %0" : "=rm" ((dest)))
+
 #include "common-defs.h"
 
 #endif

arch/m68k/startcontext.S

@@ -1,26 +0,0 @@
-/*
- * 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 "defs.h"
-
-FUNC(libucontext_trampoline)
-	lea	(%sp, %d7.l * REG_SZ), %sp	/* place uc_link in $sp */
-
-	tst.l	(%sp)				/* test next content for NULL */
-	jeq	no_linked_context
-
-	jbsr	libucontext_setcontext			/* call setcontext */
-	move.l	%d0, (%sp)
-
-no_linked_context:
-	jbsr	exit
-END(libucontext_trampoline)

arch/m68k/trampoline.c

@@ -0,0 +1,2 @@
+#include "defs.h"
+#include "common-trampoline.c"