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/* 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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