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$NetBSD: patch-gcc_config_exec-stack.h,v 1.1 2014/05/31 13:06:25 ryoon Exp $
--- gcc/config/exec-stack.h.orig 2014-05-24 12:02:13.000000000 +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"); \
+}
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