(INITIALIZE_TRAMPOLINE): Append call to __enable_execute_stack.

(INITIALIZE_TRAMPOLINE): Append call to
__enable_execute_stack.
(CLEAR_INSN_CACHE): New macro.

From-SVN: r5395

gcc/config/m68k/next.h

@@ -181,3 +181,26 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #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")
+