gcc/config/host-solaris.c

   1 /* Solaris host-specific hook definitions.
   2    Copyright (C) 2004, 2007, 2008, 2010 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_GET_ADDRESS
  29 #define HOST_HOOKS_GT_PCH_GET_ADDRESS sol_gt_pch_get_address
  30 #undef HOST_HOOKS_GT_PCH_USE_ADDRESS
  31 #define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address
  32
  33 /* Before Solaris 11, the mmap ADDR parameter is mostly ignored without
  34    MAP_FIXED set.  Before we give up, search the desired address space with
  35    mincore to see if the space is really free.  */
  36
  37 static void *
  38 mmap_fixed (void *addr, size_t len, int prot, int flags, int fd, off_t off)
  39 {
  40   void *base;
  41
  42   base = mmap ((caddr_t) addr, len, prot, flags, fd, off);
  43
  44   if (base != addr)
  45     {
  46       size_t page_size = getpagesize();
  47       char one_byte;
  48       size_t i;
  49
  50       if (base != (void *) MAP_FAILED)
  51         munmap ((caddr_t) base, len);
  52
  53       errno = 0;
  54       for (i = 0; i < len; i += page_size)
  55         if (mincore ((char *)addr + i, page_size, (char *) &one_byte) == -1
  56             && errno == ENOMEM)
  57           continue; /* The page is not mapped.  */
  58         else
  59           break;
  60
  61       if (i >= len)
  62         base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off);
  63     }
  64
  65   return base;
  66 }
  67
  68 /* For various ports, try to guess a fixed spot in the vm space
  69    that's probably free.  Based on McDougall, Mauro, Solaris Internals, 2nd
  70    ed., p.460-461, fig. 9-3, 9-4, 9-5.  */
  71 #if defined(__sparcv9__)
  72 /* This low to avoid VA hole on UltraSPARC I/II.  */
  73 # define TRY_EMPTY_VM_SPACE     0x70000000000
  74 #elif defined(__sparc__)
  75 # define TRY_EMPTY_VM_SPACE     0x80000000
  76 #elif defined(__x86_64__)
  77 # define TRY_EMPTY_VM_SPACE     0x8000000000000000
  78 #elif defined(__i386__)
  79 # define TRY_EMPTY_VM_SPACE     0xB0000000
  80 #else
  81 # define TRY_EMPTY_VM_SPACE     0
  82 #endif
  83
  84 /* Determine a location where we might be able to reliably allocate
  85    SIZE bytes.  FD is the PCH file, though we should return with the
  86    file unmapped.  */
  87
  88 static void *
  89 sol_gt_pch_get_address (size_t size, int fd)
  90 {
  91   void *addr;
  92
  93   addr = mmap_fixed ((caddr_t) TRY_EMPTY_VM_SPACE, size,
  94                      PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
  95
  96   /* If we failed the map, that means there's *no* free space.  */
  97   if (addr == (void *) MAP_FAILED)
  98     return NULL;
  99   /* Unmap the area before returning.  */
 100   munmap ((caddr_t) addr, size);
 101
 102   return addr;
 103 }
 104
 105 /* Map SIZE bytes of FD+OFFSET at BASE.  Return 1 if we succeeded at
 106    mapping the data at BASE, -1 if we couldn't.  */
 107
 108 static int
 109 sol_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
 110 {
 111   void *addr;
 112
 113   /* We're called with size == 0 if we're not planning to load a PCH
 114      file at all.  This allows the hook to free any static space that
 115      we might have allocated at link time.  */
 116   if (size == 0)
 117     return -1;
 118
 119   addr = mmap_fixed ((caddr_t) base, size,
 120                      PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset);
 121
 122   return addr == base ? 1 : -1;
 123 }
 124
 125 \f
 126 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;