host-solaris.c revision 1.1 
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
37static void *
38mmap_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
88static void *
89sol_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
108static int
109sol_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
126const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
127