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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [host-solaris.c] - Blame information for rev 282

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1 282 jeremybenn
/* Solaris host-specific hook definitions.
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   Copyright (C) 2004, 2007, 2008, 2010 Free Software Foundation, Inc.
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   This file is part of GCC.
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   GCC is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published
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   by the Free Software Foundation; either version 3, or (at your
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   option) any later version.
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   GCC is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   License for more details.
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   You should have received a copy of the GNU General Public License
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   along with GCC; see the file COPYING3.  If not see
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   <http://www.gnu.org/licenses/>.  */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include <sys/mman.h>
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#include "hosthooks.h"
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#include "hosthooks-def.h"
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#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
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#define HOST_HOOKS_GT_PCH_GET_ADDRESS sol_gt_pch_get_address
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#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
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#define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address
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/* Before Solaris 11, the mmap ADDR parameter is mostly ignored without
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   MAP_FIXED set.  Before we give up, search the desired address space with
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   mincore to see if the space is really free.  */
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static void *
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mmap_fixed (void *addr, size_t len, int prot, int flags, int fd, off_t off)
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{
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  void *base;
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  base = mmap ((caddr_t) addr, len, prot, flags, fd, off);
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  if (base != addr)
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    {
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      size_t page_size = getpagesize();
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      char one_byte;
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      size_t i;
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      if (base != (void *) MAP_FAILED)
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        munmap ((caddr_t) base, len);
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      errno = 0;
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      for (i = 0; i < len; i += page_size)
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        if (mincore ((char *)addr + i, page_size, (char *) &one_byte) == -1
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            && errno == ENOMEM)
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          continue; /* The page is not mapped.  */
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        else
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          break;
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      if (i >= len)
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        base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off);
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    }
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  return base;
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}
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/* For various ports, try to guess a fixed spot in the vm space
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   that's probably free.  Based on McDougall, Mauro, Solaris Internals, 2nd
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   ed., p.460-461, fig. 9-3, 9-4, 9-5.  */
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#if defined(__sparcv9__)
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/* This low to avoid VA hole on UltraSPARC I/II.  */
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# define TRY_EMPTY_VM_SPACE     0x70000000000
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#elif defined(__sparc__)
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# define TRY_EMPTY_VM_SPACE     0x80000000
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#elif defined(__x86_64__)
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# define TRY_EMPTY_VM_SPACE     0x8000000000000000
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#elif defined(__i386__)
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# define TRY_EMPTY_VM_SPACE     0xB0000000
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#else
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# define TRY_EMPTY_VM_SPACE     0
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#endif
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/* Determine a location where we might be able to reliably allocate
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   SIZE bytes.  FD is the PCH file, though we should return with the
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   file unmapped.  */
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static void *
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sol_gt_pch_get_address (size_t size, int fd)
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{
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  void *addr;
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  addr = mmap_fixed ((caddr_t) TRY_EMPTY_VM_SPACE, size,
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                     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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  /* If we failed the map, that means there's *no* free space.  */
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  if (addr == (void *) MAP_FAILED)
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    return NULL;
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  /* Unmap the area before returning.  */
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  munmap ((caddr_t) addr, size);
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  return addr;
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}
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/* Map SIZE bytes of FD+OFFSET at BASE.  Return 1 if we succeeded at
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   mapping the data at BASE, -1 if we couldn't.  */
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static int
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sol_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
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{
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  void *addr;
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  /* We're called with size == 0 if we're not planning to load a PCH
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     file at all.  This allows the hook to free any static space that
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     we might have allocated at link time.  */
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  if (size == 0)
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    return -1;
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  addr = mmap_fixed ((caddr_t) base, size,
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                     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset);
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  return addr == base ? 1 : -1;
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}
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const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;

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