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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, 59 Temple Place - Suite 330, Boston, | |
19 | MA 02111-1307, 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. */ | |
29 | static 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 | ||
33 | void * | |
34 | darwin_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 | ||
45 | int | |
46 | darwin_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 | ||
992d08b1 NS |
52 | gcc_assert ((size_t)pch_address_space % pagesize == 0 |
53 | && sizeof (pch_address_space) % pagesize == 0); | |
ed23bd30 GK |
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\n"); | |
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. */ | |
992d08b1 | 75 | gcc_assert (!ret || mmap_result == addr); |
ed23bd30 GK |
76 | } |
77 | ||
78 | return ret; | |
79 | } |