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51796b3a | 1 | /* OpenBSD host-specific hook definitions. |
f1717362 | 2 | Copyright (C) 2004-2016 Free Software Foundation, Inc. |
51796b3a | 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 "hosthooks.h" | |
24 | #include "hosthooks-def.h" | |
25 | ||
26 | ||
27 | #undef HOST_HOOKS_GT_PCH_GET_ADDRESS | |
28 | #define HOST_HOOKS_GT_PCH_GET_ADDRESS openbsd_gt_pch_get_address | |
29 | #undef HOST_HOOKS_GT_PCH_USE_ADDRESS | |
30 | #define HOST_HOOKS_GT_PCH_USE_ADDRESS openbsd_gt_pch_use_address | |
31 | ||
32 | /* For various ports, try to guess a fixed spot in the vm space | |
33 | that's probably free. */ | |
34 | #if defined(__amd64__) | |
35 | # define TRY_EMPTY_VM_SPACE 0x400000000000 | |
07cf7615 | 36 | #elif defined(__hppa__) |
37 | # define TRY_EMPTY_VM_SPACE 0xb0000000 | |
51796b3a | 38 | #elif defined(__i386__) |
39 | # define TRY_EMPTY_VM_SPACE 0xb0000000 | |
40 | #else | |
41 | # define TRY_EMPTY_VM_SPACE 0 | |
42 | #endif | |
43 | ||
44 | /* Determine a location where we might be able to reliably allocate | |
45 | SIZE bytes. FD is the PCH file, though we should return with the | |
46 | file unmapped. */ | |
47 | ||
48 | static void * | |
49 | openbsd_gt_pch_get_address (size_t size, int fd) | |
50 | { | |
51 | void *addr; | |
52 | ||
53 | addr = mmap ((void *) TRY_EMPTY_VM_SPACE, size, PROT_READ | PROT_WRITE, | |
54 | MAP_PRIVATE, fd, 0); | |
55 | ||
56 | /* If we failed the map, that means there's *no* free space. */ | |
57 | if (addr == (void *) MAP_FAILED) | |
58 | return NULL; | |
59 | /* Unmap the area before returning. */ | |
60 | munmap (addr, size); | |
61 | ||
62 | return addr; | |
63 | } | |
64 | ||
65 | /* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at | |
66 | mapping the data at BASE, -1 if we couldn't. */ | |
67 | ||
68 | static int | |
69 | openbsd_gt_pch_use_address (void *base, size_t size, int fd, size_t offset) | |
70 | { | |
71 | void *addr; | |
72 | ||
73 | /* We're called with size == 0 if we're not planning to load a PCH | |
74 | file at all. This allows the hook to free any static space that | |
75 | we might have allocated at link time. */ | |
76 | if (size == 0) | |
77 | return -1; | |
78 | ||
79 | addr = mmap (base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset); | |
80 | ||
81 | return addr == base ? 1 : -1; | |
82 | } | |
83 | ||
84 | \f | |
85 | const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; |