80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* Darwin host-specific hook definitions.
|
|
Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC 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.
|
|
|
|
GCC 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 GCC; see the file COPYING. If not, write to the
|
|
Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
#include "config.h"
|
|
#include "system.h"
|
|
#include "coretypes.h"
|
|
#include <sys/mman.h>
|
|
#include "toplev.h"
|
|
#include "config/host-darwin.h"
|
|
|
|
/* Yes, this is really supposed to work. */
|
|
static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096)));
|
|
|
|
/* Return the address of the PCH address space, if the PCH will fit in it. */
|
|
|
|
void *
|
|
darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED)
|
|
{
|
|
if (sz <= sizeof (pch_address_space))
|
|
return pch_address_space;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of
|
|
pch_address_space beyond SZ. */
|
|
|
|
int
|
|
darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off)
|
|
{
|
|
const size_t pagesize = getpagesize();
|
|
void *mmap_result;
|
|
int ret;
|
|
|
|
gcc_assert ((size_t)pch_address_space % pagesize == 0
|
|
&& sizeof (pch_address_space) % pagesize == 0);
|
|
|
|
ret = (addr == pch_address_space && sz <= sizeof (pch_address_space));
|
|
if (! ret)
|
|
sz = 0;
|
|
|
|
/* Round the size to a whole page size. Normally this is a no-op. */
|
|
sz = (sz + pagesize - 1) / pagesize * pagesize;
|
|
|
|
if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0)
|
|
fatal_error ("couldn't unmap pch_address_space: %m");
|
|
|
|
if (ret)
|
|
{
|
|
mmap_result = mmap (addr, sz,
|
|
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
|
|
fd, off);
|
|
|
|
/* The file might not be mmap-able. */
|
|
ret = mmap_result != (void *) MAP_FAILED;
|
|
|
|
/* Sanity check for broken MAP_FIXED. */
|
|
gcc_assert (!ret || mmap_result == addr);
|
|
}
|
|
|
|
return ret;
|
|
}
|