1169689Skan/* Darwin host-specific hook definitions. 2169689Skan Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. 3169689Skan 4169689Skan This file is part of GCC. 5169689Skan 6169689Skan GCC is free software; you can redistribute it and/or modify it 7169689Skan under the terms of the GNU General Public License as published 8169689Skan by the Free Software Foundation; either version 2, or (at your 9169689Skan option) any later version. 10169689Skan 11169689Skan GCC is distributed in the hope that it will be useful, but WITHOUT 12169689Skan ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13169689Skan or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14169689Skan License for more details. 15169689Skan 16169689Skan You should have received a copy of the GNU General Public License 17169689Skan along with GCC; see the file COPYING. If not, write to the 18169689Skan Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, 19169689Skan MA 02110-1301, USA. */ 20169689Skan 21169689Skan#include "config.h" 22169689Skan#include "system.h" 23169689Skan#include "coretypes.h" 24169689Skan#include <sys/mman.h> 25169689Skan#include "toplev.h" 26169689Skan#include "config/host-darwin.h" 27169689Skan 28169689Skan/* Yes, this is really supposed to work. */ 29169689Skanstatic char pch_address_space[1024*1024*1024] __attribute__((aligned (4096))); 30169689Skan 31169689Skan/* Return the address of the PCH address space, if the PCH will fit in it. */ 32169689Skan 33169689Skanvoid * 34169689Skandarwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED) 35169689Skan{ 36169689Skan if (sz <= sizeof (pch_address_space)) 37169689Skan return pch_address_space; 38169689Skan else 39169689Skan return NULL; 40169689Skan} 41169689Skan 42169689Skan/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of 43169689Skan pch_address_space beyond SZ. */ 44169689Skan 45169689Skanint 46169689Skandarwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off) 47169689Skan{ 48169689Skan const size_t pagesize = getpagesize(); 49169689Skan void *mmap_result; 50169689Skan int ret; 51169689Skan 52169689Skan gcc_assert ((size_t)pch_address_space % pagesize == 0 53169689Skan && sizeof (pch_address_space) % pagesize == 0); 54169689Skan 55169689Skan ret = (addr == pch_address_space && sz <= sizeof (pch_address_space)); 56169689Skan if (! ret) 57169689Skan sz = 0; 58169689Skan 59169689Skan /* Round the size to a whole page size. Normally this is a no-op. */ 60169689Skan sz = (sz + pagesize - 1) / pagesize * pagesize; 61169689Skan 62169689Skan if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0) 63169689Skan fatal_error ("couldn't unmap pch_address_space: %m"); 64169689Skan 65169689Skan if (ret) 66169689Skan { 67169689Skan mmap_result = mmap (addr, sz, 68169689Skan PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED, 69169689Skan fd, off); 70169689Skan 71169689Skan /* The file might not be mmap-able. */ 72169689Skan ret = mmap_result != (void *) MAP_FAILED; 73169689Skan 74169689Skan /* Sanity check for broken MAP_FIXED. */ 75169689Skan gcc_assert (!ret || mmap_result == addr); 76169689Skan } 77169689Skan 78169689Skan return ret; 79169689Skan} 80