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/* PA host-specific hook definitions.
Copyright (C) 2004 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 2, 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 COPYING. If not, write to the
Free Software Foundation, 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include <sys/mman.h>
#include "hosthooks.h"
#include "hosthooks-def.h"
static void *pa_gt_pch_get_address (size_t, int);
static int pa_gt_pch_use_address (void *, size_t, int, size_t);
#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
#define HOST_HOOKS_GT_PCH_GET_ADDRESS pa_gt_pch_get_address
#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
#define HOST_HOOKS_GT_PCH_USE_ADDRESS pa_gt_pch_use_address
/* For various ports, try to guess a fixed spot in the vm space
that's probably free. */
#if defined(__hppa__) && defined(__LP64__)
# define TRY_EMPTY_VM_SPACE 0x8000000000000000
#elif defined(__hppa__)
# define TRY_EMPTY_VM_SPACE 0x60000000
#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 *
pa_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.
It's not possibly to reliably mmap a file using MAP_PRIVATE to
a specific START address on either hpux or linux. First we see
if mmap with MAP_PRIVATE works. If it does, we are off to the
races. If it doesn't, we try an anonymous MAP_PRIVATE since the
kernel is more likely to honor the BASE address in anonymous maps.
We then mmap the file to an arbitrary location and copy the data
to the anonymous private map. This assumes of course that we
don't need to change the PCH data after the file is created.
This approach obviously causes a performance penalty but there is
little else we can do given the current PCH implementation. */
static int
pa_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
{
void *addr, *faddr;
/* 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;
/* Try to map the file with MAP_PRIVATE. */
addr = mmap (base, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE, fd, offset);
if (addr == base)
return 1;
if (addr != (void *) MAP_FAILED)
munmap (addr, size);
addr = mmap (base, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (addr != base)
return -1;
faddr = mmap (NULL, size, PROT_READ, MAP_PRIVATE,
fd, offset);
if (faddr == (void *) MAP_FAILED)
return -1;
memcpy (addr, faddr, size);
munmap (faddr, size);
return 1;
}
const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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