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/* OpenBSD host-specific hook definitions.
Copyright (C) 2004-2019 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;
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