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1 /* OpenBSD host-specific hook definitions.
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131
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2 Copyright (C) 2004-2018 Free Software Foundation, Inc.
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111
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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 "hosthooks.h"
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24 #include "hosthooks-def.h"
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25
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26
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27 #undef HOST_HOOKS_GT_PCH_GET_ADDRESS
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28 #define HOST_HOOKS_GT_PCH_GET_ADDRESS openbsd_gt_pch_get_address
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29 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS
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30 #define HOST_HOOKS_GT_PCH_USE_ADDRESS openbsd_gt_pch_use_address
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31
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32 /* For various ports, try to guess a fixed spot in the vm space
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33 that's probably free. */
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34 #if defined(__amd64__)
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35 # define TRY_EMPTY_VM_SPACE 0x400000000000
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36 #elif defined(__hppa__)
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37 # define TRY_EMPTY_VM_SPACE 0xb0000000
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38 #elif defined(__i386__)
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39 # define TRY_EMPTY_VM_SPACE 0xb0000000
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40 #else
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41 # define TRY_EMPTY_VM_SPACE 0
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42 #endif
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43
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44 /* Determine a location where we might be able to reliably allocate
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45 SIZE bytes. FD is the PCH file, though we should return with the
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46 file unmapped. */
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47
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48 static void *
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49 openbsd_gt_pch_get_address (size_t size, int fd)
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50 {
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51 void *addr;
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52
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53 addr = mmap ((void *) TRY_EMPTY_VM_SPACE, size, PROT_READ | PROT_WRITE,
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54 MAP_PRIVATE, fd, 0);
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55
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56 /* If we failed the map, that means there's *no* free space. */
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57 if (addr == (void *) MAP_FAILED)
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58 return NULL;
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59 /* Unmap the area before returning. */
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60 munmap (addr, size);
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61
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62 return addr;
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63 }
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64
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65 /* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at
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66 mapping the data at BASE, -1 if we couldn't. */
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67
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68 static int
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69 openbsd_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
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70 {
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71 void *addr;
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72
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73 /* We're called with size == 0 if we're not planning to load a PCH
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74 file at all. This allows the hook to free any static space that
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75 we might have allocated at link time. */
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76 if (size == 0)
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77 return -1;
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78
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79 addr = mmap (base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset);
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80
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81 return addr == base ? 1 : -1;
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82 }
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83
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84
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85 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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