1 /* NetBSD host-specific hook definitions. 2 Copyright (C) 2004-2013 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 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 netbsd_gt_pch_get_address 29 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS 30 #define HOST_HOOKS_GT_PCH_USE_ADDRESS netbsd_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(__sparc64__) 35 # define TRY_EMPTY_VM_SPACE 0x40000000000 36 #elif defined(_LP64) 37 # define TRY_EMPTY_VM_SPACE 0x400000000000 38 #elif defined(__mips__) || defined(__vax__) || defined (__arm__) 39 # define TRY_EMPTY_VM_SPACE 0x60000000 40 #else 41 # define TRY_EMPTY_VM_SPACE 0xb0000000 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 netbsd_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 | MAP_FIXED, 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 netbsd_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 | MAP_FIXED, fd, offset); 80 81 return addr == base ? 1 : -1; 82 } 83 84 85 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; 86