$NetBSD: patch-gcc_config_exec-stack.h,v 1.1 2014/01/25 13:38:48 ryoon Exp $

--- gcc/config/exec-stack.h.orig	2014-01-25 06:53:23.000000000 +0000
+++ gcc/config/exec-stack.h
@@ -0,0 +1,40 @@
+/* Enable stack execute around trampoline address.  
+   Copyright (C) 2002 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#undef FINALIZE_TRAMPOLINE
+#define FINALIZE_TRAMPOLINE(TRAMP) \
+  emit_library_call(gen_rtx_SYMBOL_REF (Pmode, "__enable_execute_stack"), \
+		    0, VOIDmode, 1, memory_address (SImode, (TRAMP)), Pmode)
+
+#undef TRANSFER_FROM_TRAMPOLINE
+#define TRANSFER_FROM_TRAMPOLINE					\
+extern void __enable_execute_stack (void *);				\
+void									\
+__enable_execute_stack (addr)						\
+     void *addr;							\
+{									\
+  long size = getpagesize ();						\
+  long mask = ~(size-1);						\
+  char *page = (char *) (((long) addr) & mask); 			\
+  char *end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
+								      \
+  if (mprotect (page, end - page, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) \
+    perror ("mprotect of trampoline code");				\
+}
