--- /dev/null
+/* HP-UX host-specific hook definitions.
+ Copyright (C) 2004, 2005, 2007 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 <sys/mman.h>
+#include <unistd.h>
+#include "hosthooks.h"
+#include "hosthooks-def.h"
+
+#ifndef MAP_FAILED
+#define MAP_FAILED (void *)-1L
+#endif
+
+static void *hpux_gt_pch_get_address (size_t, int);
+static int hpux_gt_pch_use_address (void *, size_t, int, size_t);
+
+#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
+#define HOST_HOOKS_GT_PCH_GET_ADDRESS hpux_gt_pch_get_address
+#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
+#define HOST_HOOKS_GT_PCH_USE_ADDRESS hpux_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(__ia64__)) && defined(__LP64__)
+# define TRY_EMPTY_VM_SPACE 0x8000000000000000
+#elif defined(__hppa__) || defined(__ia64__)
+# 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 *
+hpux_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 private mmap since the
+ kernel is more likely to honor the BASE address in anonymous maps.
+ We then copy the data to the anonymous private map. This assumes
+ of course that we don't need to change the data in the PCH file
+ after it is created.
+
+ This approach obviously causes a performance penalty but there is
+ little else we can do given the current PCH implementation. */
+
+static int
+hpux_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;
+
+ /* 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);
+
+ /* Try to make an anonymous private mmap at the desired location. */
+ addr = mmap (base, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+ if (addr != base)
+ {
+ if (addr != (void *) MAP_FAILED)
+ munmap (addr, size);
+ return -1;
+ }
+
+ if (lseek (fd, offset, SEEK_SET) == (off_t)-1)
+ return -1;
+
+ while (size)
+ {
+ ssize_t nbytes;
+
+ nbytes = read (fd, base, MIN (size, SSIZE_MAX));
+ if (nbytes <= 0)
+ return -1;
+ base = (char *) base + nbytes;
+ size -= nbytes;
+ }
+
+ return 1;
+}
+
+\f
+const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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