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