gcc/config/host-solaris.c

   1 /* Solaris host-specific hook definitions.
   2    Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the
  18    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include <sys/mman.h>
  25 #include "hosthooks.h"
  26 #include "hosthooks-def.h"
  27
  28
  29 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS
  30 #define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address
  31
  32 /* Map SIZE bytes of FD+OFFSET at BASE.  Return 1 if we succeeded at
  33    mapping the data at BASE, -1 if we couldn't.  */
  34
  35 static int
  36 sol_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
  37 {
  38   void *addr;
  39
  40   /* We're called with size == 0 if we're not planning to load a PCH
  41      file at all.  This allows the hook to free any static space that
  42      we might have allocated at link time.  */
  43   if (size == 0)
  44     return -1;
  45
  46   addr = mmap (base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
  47                fd, offset);
  48
  49   /* Solaris isn't good about honoring the mmap START parameter
  50      without MAP_FIXED set.  Before we give up, search the desired
  51      address space with mincore to see if the space is really free.  */
  52   if (addr != base)
  53     {
  54       size_t page_size = getpagesize();
  55       char one_byte;
  56       size_t i;
  57
  58       if (addr != (void *) MAP_FAILED)
  59         munmap (addr, size);
  60
  61       errno = 0;
  62       for (i = 0; i < size; i += page_size)
  63         if (mincore ((char *)base + i, page_size, (void *)&one_byte) == -1
  64             && errno == ENOMEM)
  65           continue; /* The page is not mapped.  */
  66         else
  67           break;
  68
  69       if (i >= size)
  70         addr = mmap (base, size,
  71                      PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
  72                      fd, offset);
  73     }
  74
  75   return addr == base ? 1 : -1;
  76 }
  77
  78 \f
  79 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;