| /* OpenBSD host-specific hook definitions. |
| Copyright (C) 2004-2022 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it |
| under the terms of the GNU General Public License as published |
| by the Free Software Foundation; either version 3, or (at your |
| option) any later version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "hosthooks.h" |
| #include "hosthooks-def.h" |
| |
| |
| #undef HOST_HOOKS_GT_PCH_GET_ADDRESS |
| #define HOST_HOOKS_GT_PCH_GET_ADDRESS openbsd_gt_pch_get_address |
| #undef HOST_HOOKS_GT_PCH_USE_ADDRESS |
| #define HOST_HOOKS_GT_PCH_USE_ADDRESS openbsd_gt_pch_use_address |
| |
| /* For various ports, try to guess a fixed spot in the vm space |
| that's probably free. */ |
| #if defined(__amd64__) |
| # define TRY_EMPTY_VM_SPACE 0x400000000000 |
| #elif defined(__hppa__) |
| # define TRY_EMPTY_VM_SPACE 0xb0000000 |
| #elif defined(__i386__) |
| # define TRY_EMPTY_VM_SPACE 0xb0000000 |
| #else |
| # define TRY_EMPTY_VM_SPACE 0 |
| #endif |
| |
| /* Determine a location where we might be able to reliably allocate |
| SIZE bytes. FD is the PCH file, though we should return with the |
| file unmapped. */ |
| |
| static void * |
| openbsd_gt_pch_get_address (size_t size, int fd) |
| { |
| void *addr; |
| |
| addr = mmap ((void *) TRY_EMPTY_VM_SPACE, size, PROT_READ | PROT_WRITE, |
| MAP_PRIVATE, fd, 0); |
| |
| /* If we failed the map, that means there's *no* free space. */ |
| if (addr == (void *) MAP_FAILED) |
| return NULL; |
| /* Unmap the area before returning. */ |
| munmap (addr, size); |
| |
| return addr; |
| } |
| |
| /* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at |
| mapping the data at BASE, -1 if we couldn't. */ |
| |
| static int |
| openbsd_gt_pch_use_address (void *&base, size_t size, int fd, size_t offset) |
| { |
| void *addr; |
| |
| /* We're called with size == 0 if we're not planning to load a PCH |
| file at all. This allows the hook to free any static space that |
| we might have allocated at link time. */ |
| if (size == 0) |
| return -1; |
| |
| addr = mmap (base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset); |
| |
| return addr == base ? 1 : -1; |
| } |
| |
| |
| const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; |