1/* Solaris host-specific hook definitions.
2   Copyright (C) 2004-2015 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 "hosthooks.h"
24#include "hosthooks-def.h"
25
26
27#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
28#define HOST_HOOKS_GT_PCH_GET_ADDRESS sol_gt_pch_get_address
29#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
30#define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address
31
32/* Before Solaris 11, the mmap ADDR parameter is mostly ignored without
33   MAP_FIXED set.  Before we give up, search the desired address space with
34   mincore to see if the space is really free.  */
35
36static void *
37mmap_fixed (void *addr, size_t len, int prot, int flags, int fd, off_t off)
38{
39  void *base;
40
41  base = mmap ((caddr_t) addr, len, prot, flags, fd, off);
42
43  if (base != addr)
44    {
45      size_t page_size = getpagesize();
46      char one_byte;
47      size_t i;
48
49      if (base != (void *) MAP_FAILED)
50	munmap ((caddr_t) base, len);
51
52      errno = 0;
53      for (i = 0; i < len; i += page_size)
54	if (mincore ((char *)addr + i, page_size, (char *) &one_byte) == -1
55	    && errno == ENOMEM)
56	  continue; /* The page is not mapped.  */
57	else
58	  break;
59
60      if (i >= len)
61	base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off);
62    }
63
64  return base;
65}
66
67/* For various ports, try to guess a fixed spot in the vm space
68   that's probably free.  Based on McDougall, Mauro, Solaris Internals, 2nd
69   ed., p.460-461, fig. 9-3, 9-4, 9-5.  */
70#if defined(__sparcv9__)
71/* This low to avoid VA hole on UltraSPARC I/II.  */
72# define TRY_EMPTY_VM_SPACE	0x70000000000
73#elif defined(__sparc__)
74# define TRY_EMPTY_VM_SPACE	0x80000000
75#elif defined(__x86_64__)
76# define TRY_EMPTY_VM_SPACE	0x80000000000
77#elif defined(__i386__)
78# define TRY_EMPTY_VM_SPACE	0xB0000000
79#else
80# define TRY_EMPTY_VM_SPACE	0
81#endif
82
83/* Determine a location where we might be able to reliably allocate
84   SIZE bytes.  FD is the PCH file, though we should return with the
85   file unmapped.  */
86
87static void *
88sol_gt_pch_get_address (size_t size, int fd)
89{
90  void *addr;
91
92  addr = mmap_fixed ((caddr_t) TRY_EMPTY_VM_SPACE, size,
93		     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
94
95  /* If we failed the map, that means there's *no* free space.  */
96  if (addr == (void *) MAP_FAILED)
97    return NULL;
98  /* Unmap the area before returning.  */
99  munmap ((caddr_t) addr, size);
100
101  return addr;
102}
103
104/* Map SIZE bytes of FD+OFFSET at BASE.  Return 1 if we succeeded at
105   mapping the data at BASE, -1 if we couldn't.  */
106
107static int
108sol_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
109{
110  void *addr;
111
112  /* We're called with size == 0 if we're not planning to load a PCH
113     file at all.  This allows the hook to free any static space that
114     we might have allocated at link time.  */
115  if (size == 0)
116    return -1;
117
118  addr = mmap_fixed ((caddr_t) base, size,
119		     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset);
120
121  return addr == base ? 1 : -1;
122}
123
124
125const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
126