1/* Darwin host-specific hook definitions. 2 Copyright (C) 2003, 2004, 2005, 2007 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 3, 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 COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20#include "config.h" 21#include "system.h" 22#include "coretypes.h" 23#include <sys/mman.h> 24#include "toplev.h" 25#include "config/host-darwin.h" 26 27/* Yes, this is really supposed to work. */ 28static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096))); 29 30/* Return the address of the PCH address space, if the PCH will fit in it. */ 31 32void * 33darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED) 34{ 35 if (sz <= sizeof (pch_address_space)) 36 return pch_address_space; 37 else 38 return NULL; 39} 40 41/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of 42 pch_address_space beyond SZ. */ 43 44int 45darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off) 46{ 47 const size_t pagesize = getpagesize(); 48 void *mmap_result; 49 int ret; 50 51 gcc_assert ((size_t)pch_address_space % pagesize == 0 52 && sizeof (pch_address_space) % pagesize == 0); 53 54 ret = (addr == pch_address_space && sz <= sizeof (pch_address_space)); 55 if (! ret) 56 sz = 0; 57 58 /* Round the size to a whole page size. Normally this is a no-op. */ 59 sz = (sz + pagesize - 1) / pagesize * pagesize; 60 61 if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0) 62 fatal_error ("couldn't unmap pch_address_space: %m"); 63 64 if (ret) 65 { 66 mmap_result = mmap (addr, sz, 67 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED, 68 fd, off); 69 70 /* The file might not be mmap-able. */ 71 ret = mmap_result != (void *) MAP_FAILED; 72 73 /* Sanity check for broken MAP_FIXED. */ 74 gcc_assert (!ret || mmap_result == addr); 75 } 76 77 return ret; 78} 79