1 /* Solaris host-specific hook definitions.
2 Copyright (C) 2004-2018 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
36 static void *
mmap_fixed(void * addr,size_t len,int prot,int flags,int fd,off_t off)37 mmap_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
87 static void *
sol_gt_pch_get_address(size_t size,int fd)88 sol_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
107 static int
sol_gt_pch_use_address(void * base,size_t size,int fd,size_t offset)108 sol_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
125 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
126