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1 /* Darwin host-specific hook definitions.
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2 Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published
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8 by the Free Software Foundation; either version 3, or (at your
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9 option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include <sys/mman.h>
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24 #include "toplev.h"
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25 #include "config/host-darwin.h"
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26
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27 /* Yes, this is really supposed to work. */
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28 static char pch_address_space[1024*1024*1024] __attribute__((aligned (4096)));
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29
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30 /* Return the address of the PCH address space, if the PCH will fit in it. */
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31
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32 void *
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33 darwin_gt_pch_get_address (size_t sz, int fd ATTRIBUTE_UNUSED)
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34 {
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35 if (sz <= sizeof (pch_address_space))
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36 return pch_address_space;
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37 else
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38 return NULL;
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39 }
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40
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41 /* Check ADDR and SZ for validity, and deallocate (using munmap) that part of
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42 pch_address_space beyond SZ. */
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43
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44 int
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45 darwin_gt_pch_use_address (void *addr, size_t sz, int fd, size_t off)
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46 {
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47 const size_t pagesize = getpagesize();
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48 void *mmap_result;
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49 int ret;
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50
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51 gcc_assert ((size_t)pch_address_space % pagesize == 0
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52 && sizeof (pch_address_space) % pagesize == 0);
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53
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54 ret = (addr == pch_address_space && sz <= sizeof (pch_address_space));
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55 if (! ret)
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56 sz = 0;
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57
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58 /* Round the size to a whole page size. Normally this is a no-op. */
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59 sz = (sz + pagesize - 1) / pagesize * pagesize;
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60
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61 if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0)
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62 fatal_error ("couldn't unmap pch_address_space: %m");
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63
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64 if (ret)
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65 {
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66 mmap_result = mmap (addr, sz,
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67 PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
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68 fd, off);
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69
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70 /* The file might not be mmap-able. */
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71 ret = mmap_result != (void *) MAP_FAILED;
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72
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73 /* Sanity check for broken MAP_FIXED. */
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74 gcc_assert (!ret || mmap_result == addr);
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75 }
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76
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77 return ret;
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78 }
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