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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;