gcc/config/host-solaris.c

   1 /* Solaris host-specific hook definitions.
   2    Copyright (C) 2004, 2007 Free Software Foundation, Inc.
   3
   4    This file is part of GCC.
   5
   6    GCC is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published
   8    by the Free Software Foundation; either version 3, or (at your
   9    option) any later version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include <sys/mman.h>
  24 #include "hosthooks.h"
  25 #include "hosthooks-def.h"
  26
  27
  28 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS
  29 #define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address
  30
  31 /* Map SIZE bytes of FD+OFFSET at BASE.  Return 1 if we succeeded at
  32    mapping the data at BASE, -1 if we couldn't.  */
  33
  34 static int
  35 sol_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
  36 {
  37   void *addr;
  38
  39   /* We're called with size == 0 if we're not planning to load a PCH
  40      file at all.  This allows the hook to free any static space that
  41      we might have allocated at link time.  */
  42   if (size == 0)
  43     return -1;
  44
  45   addr = mmap (base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
  46                fd, offset);
  47
  48   /* Solaris isn't good about honoring the mmap START parameter
  49      without MAP_FIXED set.  Before we give up, search the desired
  50      address space with mincore to see if the space is really free.  */
  51   if (addr != base)
  52     {
  53       size_t page_size = getpagesize();
  54       char one_byte;
  55       size_t i;
  56
  57       if (addr != (void *) MAP_FAILED)
  58         munmap (addr, size);
  59
  60       errno = 0;
  61       for (i = 0; i < size; i += page_size)
  62         if (mincore ((char *)base + i, page_size, (void *)&one_byte) == -1
  63             && errno == ENOMEM)
  64           continue; /* The page is not mapped.  */
  65         else
  66           break;
  67
  68       if (i >= size)
  69         addr = mmap (base, size,
  70                      PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
  71                      fd, offset);
  72     }
  73
  74   return addr == base ? 1 : -1;
  75 }
  76
  77 \f
  78 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;