1/* Darwin host-specific hook definitions. 2 Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published 8 by the Free Software Foundation; either version 2, or (at your 9 option) any later version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14 License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING. If not, write to the 18 Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21#include "config.h" 22#include "system.h" 23#include "coretypes.h" 24#include <sys/mman.h> 25#include "toplev.h" 26#include "config/host-darwin.h" 27 28/* Yes, this is really supposed to work. */ 29static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096))); 30 31/* Return the address of the PCH address space, if the PCH will fit in it. */ 32 33void * 34darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED) 35{ 36 if (sz <= sizeof (pch_address_space)) 37 return pch_address_space; 38 else 39 return NULL; 40} 41 42/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of 43 pch_address_space beyond SZ. */ 44 45int 46darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off) 47{ 48 const size_t pagesize = getpagesize(); 49 void *mmap_result; 50 int ret; 51 52 gcc_assert ((size_t)pch_address_space % pagesize == 0 53 && sizeof (pch_address_space) % pagesize == 0); 54 55 ret = (addr == pch_address_space && sz <= sizeof (pch_address_space)); 56 if (! ret) 57 sz = 0; 58 59 /* Round the size to a whole page size. Normally this is a no-op. */ 60 sz = (sz + pagesize - 1) / pagesize * pagesize; 61 62 if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0) 63 fatal_error ("couldn't unmap pch_address_space: %m"); 64 65 if (ret) 66 { 67 mmap_result = mmap (addr, sz, 68 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED, 69 fd, off); 70 71 /* The file might not be mmap-able. */ 72 ret = mmap_result != (void *) MAP_FAILED; 73 74 /* Sanity check for broken MAP_FIXED. */ 75 gcc_assert (!ret || mmap_result == addr); 76 } 77 78 return ret; 79} 80