1 /* OpenBSD host-specific hook definitions.
2 Copyright (C) 2004, 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
4 This file is part of GCC.
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.
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.
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/>. */
22 #include "coretypes.h"
23 #include "hosthooks.h"
24 #include "hosthooks-def.h"
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
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
36 #elif defined(__i386__)
37 # define TRY_EMPTY_VM_SPACE 0xb0000000
39 # define TRY_EMPTY_VM_SPACE 0
42 /* Determine a location where we might be able to reliably allocate
43 SIZE bytes. FD is the PCH file, though we should return with the
47 openbsd_gt_pch_get_address (size_t size
, int fd
)
51 addr
= mmap ((void *) TRY_EMPTY_VM_SPACE
, size
, PROT_READ
| PROT_WRITE
,
54 /* If we failed the map, that means there's *no* free space. */
55 if (addr
== (void *) MAP_FAILED
)
57 /* Unmap the area before returning. */
63 /* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at
64 mapping the data at BASE, -1 if we couldn't. */
67 openbsd_gt_pch_use_address (void *base
, size_t size
, int fd
, size_t offset
)
71 /* We're called with size == 0 if we're not planning to load a PCH
72 file at all. This allows the hook to free any static space that
73 we might have allocated at link time. */
77 addr
= mmap (base
, size
, PROT_READ
| PROT_WRITE
, MAP_PRIVATE
, fd
, offset
);
79 return addr
== base
? 1 : -1;
83 const struct host_hooks host_hooks
= HOST_HOOKS_INITIALIZER
;