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/* Solaris host-specific hook definitions.

   Copyright (C) 2004, 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 "hosthooks.h"

#include "hosthooks-def.h"

#undef HOST_HOOKS_GT_PCH_USE_ADDRESS

#define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address

/* 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

sol_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);

  /* Solaris isn't good about honoring the mmap START parameter

     without MAP_FIXED set.  Before we give up, search the desired

     address space with mincore to see if the space is really free.  */

  if (addr != base)

    {

      size_t page_size = getpagesize();

      char one_byte;

      size_t i;

      if (addr != (void *) MAP_FAILED)

        munmap (addr, size);

      errno = 0;

      for (i = 0; i < size; i += page_size)

        if (mincore ((char *)base + i, page_size, (void *)&one_byte) == -1

            && errno == ENOMEM)

          continue; /* The page is not mapped.  */

        else

          break;

      if (i >= size)

        addr = mmap (base, size,

                     PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,

                     fd, offset);

    }

  return addr == base ? 1 : -1;

}

const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;