--- gcc/config/m68k/next.h	2018/04/24 18:10:24	1.1
+++ gcc/config/m68k/next.h	2018/04/24 18:14:29	1.1.1.2
@@ -33,7 +33,7 @@ the Free Software Foundation, 675 Mass A
 
 /* Names to predefine in the preprocessor for this target machine.  */
 
-#define CPP_PREDEFINES "-Dmc68000 -Dm68k -DNeXT -Dunix -D__MACH__ -D__BIG_ENDIAN__ -D__ARCHITECTURE__=\"m68k\""
+#define CPP_PREDEFINES "-Dmc68000 -Dm68k -DNeXT -Dunix -D__MACH__ -D__BIG_ENDIAN__ -D__ARCHITECTURE__=\"m68k\" -Asystem(unix)  -Asystem(mach) -Acpu(m68k) -Amachine(m68k)"
 
 /* Every structure or union's size must be a multiple of 2 bytes.
    (Why isn't this in m68k.h?)  */
@@ -181,3 +181,26 @@ the Free Software Foundation, 675 Mass A
 
 #define OBJC_FORWARDING_STACK_OFFSET 8
 #define OBJC_FORWARDING_MIN_OFFSET 8
+
+/* INITIALIZE_TRAMPOLINE is changed so that it also enables executable
+   stack.  The __enable_execute_stack also clears the insn cache. */
+
+/* NOTE: part of this is copied from m68k.h */
+#undef INITIALIZE_TRAMPOLINE
+#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                          \
+{                                                                          \
+  rtx _addr, _func;                                                        \
+  emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 2)), TRAMP);   \
+  emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 18)), CXT);    \
+  emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 22)), FNADDR); \
+  _addr = memory_address (SImode, (TRAMP));                                  \
+  _func =  gen_rtx (SYMBOL_REF, Pmode, "__enable_execute_stack");          \
+  emit_library_call (_func, 0, VOIDmode, 1, _addr, Pmode);                   \
+}
+
+/* A C expression used to clear the instruction cache from 
+   address BEG to address END.   On NeXTSTEP this i a system trap. */
+
+#define CLEAR_INSN_CACHE(BEG, END)   \
+   asm volatile ("trap #2")
+