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/* Solaris host-specific hook definitions.

   Copyright (C) 2004, 2007, 2008, 2010 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_GET_ADDRESS

#define HOST_HOOKS_GT_PCH_GET_ADDRESS sol_gt_pch_get_address

#undef HOST_HOOKS_GT_PCH_USE_ADDRESS

#define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address

/* Before Solaris 11, the mmap ADDR parameter is mostly ignored without

   MAP_FIXED set.  Before we give up, search the desired address space with

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

static void *

mmap_fixed (void *addr, size_t len, int prot, int flags, int fd, off_t off)

{

  void *base;

  base = mmap ((caddr_t) addr, len, prot, flags, fd, off);

  if (base != addr)

    {

      size_t page_size = getpagesize();

      char one_byte;

      size_t i;

      if (base != (void *) MAP_FAILED)

        munmap ((caddr_t) base, len);

      errno = 0;

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

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

            && errno == ENOMEM)

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

        else

          break;

      if (i >= len)

        base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off);

    }

  return base;

}

/* For various ports, try to guess a fixed spot in the vm space

   that's probably free.  Based on McDougall, Mauro, Solaris Internals, 2nd

   ed., p.460-461, fig. 9-3, 9-4, 9-5.  */

#if defined(__sparcv9__)

/* This low to avoid VA hole on UltraSPARC I/II.  */

# define TRY_EMPTY_VM_SPACE     0x70000000000

#elif defined(__sparc__)

# define TRY_EMPTY_VM_SPACE     0x80000000

#elif defined(__x86_64__)

# define TRY_EMPTY_VM_SPACE     0x8000000000000000

#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 *

sol_gt_pch_get_address (size_t size, int fd)

{

  void *addr;

  addr = mmap_fixed ((caddr_t) 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 ((caddr_t) 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

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_fixed ((caddr_t) base, size,

                     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset);

  return addr == base ? 1 : -1;

}

const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;