1/* Darwin host-specific hook definitions. 2 Copyright (C) 2003-2015 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 "diagnostic-core.h" 24#include "config/host-darwin.h" 25 26/* Yes, this is really supposed to work. */ 27static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096))); 28 29/* Return the address of the PCH address space, if the PCH will fit in it. */ 30 31void * 32darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED) 33{ 34 if (sz <= sizeof (pch_address_space)) 35 return pch_address_space; 36 else 37 return NULL; 38} 39 40/* Check ADDR and SZ for validity, and deallocate (using munmap) that part of 41 pch_address_space beyond SZ. */ 42 43int 44darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off) 45{ 46 const size_t pagesize = getpagesize(); 47 void *mmap_result; 48 int ret; 49 50 gcc_assert ((size_t)pch_address_space % pagesize == 0 51 && sizeof (pch_address_space) % pagesize == 0); 52 53 ret = (addr == pch_address_space && sz <= sizeof (pch_address_space)); 54 if (! ret) 55 sz = 0; 56 57 /* Round the size to a whole page size. Normally this is a no-op. */ 58 sz = (sz + pagesize - 1) / pagesize * pagesize; 59 60 if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0) 61 fatal_error (input_location, "couldn%'t unmap pch_address_space: %m"); 62 63 if (ret) 64 { 65 mmap_result = mmap (addr, sz, 66 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED, 67 fd, off); 68 69 /* The file might not be mmap-able. */ 70 ret = mmap_result != (void *) MAP_FAILED; 71 72 /* Sanity check for broken MAP_FIXED. */ 73 gcc_assert (!ret || mmap_result == addr); 74 } 75 76 return ret; 77} 78