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9bff16b8 | 1 | /* HP-UX host-specific hook definitions. |
2f83c7d6 | 2 | Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc. |
c621016b JDA |
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 | |
2f83c7d6 | 8 | by the Free Software Foundation; either version 3, or (at your |
c621016b JDA |
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 | |
2f83c7d6 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
c621016b JDA |
19 | |
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
23 | #include <sys/mman.h> | |
b990f4bc | 24 | #include <unistd.h> |
c621016b JDA |
25 | #include "hosthooks.h" |
26 | #include "hosthooks-def.h" | |
27 | ||
b3e30ec0 JDA |
28 | #ifndef MAP_FAILED |
29 | #define MAP_FAILED (void *)-1L | |
30 | #endif | |
31 | ||
9bff16b8 SE |
32 | static void *hpux_gt_pch_get_address (size_t, int); |
33 | static int hpux_gt_pch_use_address (void *, size_t, int, size_t); | |
c621016b JDA |
34 | |
35 | #undef HOST_HOOKS_GT_PCH_GET_ADDRESS | |
9bff16b8 | 36 | #define HOST_HOOKS_GT_PCH_GET_ADDRESS hpux_gt_pch_get_address |
c621016b | 37 | #undef HOST_HOOKS_GT_PCH_USE_ADDRESS |
9bff16b8 | 38 | #define HOST_HOOKS_GT_PCH_USE_ADDRESS hpux_gt_pch_use_address |
c621016b JDA |
39 | |
40 | /* For various ports, try to guess a fixed spot in the vm space | |
41 | that's probably free. */ | |
9bff16b8 | 42 | #if (defined(__hppa__) || defined(__ia64__)) && defined(__LP64__) |
c621016b | 43 | # define TRY_EMPTY_VM_SPACE 0x8000000000000000 |
9bff16b8 | 44 | #elif defined(__hppa__) || defined(__ia64__) |
c621016b JDA |
45 | # define TRY_EMPTY_VM_SPACE 0x60000000 |
46 | #else | |
47 | # define TRY_EMPTY_VM_SPACE 0 | |
48 | #endif | |
49 | ||
50 | /* Determine a location where we might be able to reliably allocate | |
51 | SIZE bytes. FD is the PCH file, though we should return with the | |
52 | file unmapped. */ | |
53 | ||
54 | static void * | |
9bff16b8 | 55 | hpux_gt_pch_get_address (size_t size, int fd) |
c621016b JDA |
56 | { |
57 | void *addr; | |
58 | ||
59 | addr = mmap ((void *)TRY_EMPTY_VM_SPACE, size, PROT_READ | PROT_WRITE, | |
60 | MAP_PRIVATE, fd, 0); | |
61 | ||
62 | /* If we failed the map, that means there's *no* free space. */ | |
63 | if (addr == (void *) MAP_FAILED) | |
64 | return NULL; | |
65 | /* Unmap the area before returning. */ | |
66 | munmap (addr, size); | |
67 | ||
68 | return addr; | |
69 | } | |
70 | ||
71 | /* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at | |
72 | mapping the data at BASE, -1 if we couldn't. | |
73 | ||
74 | It's not possibly to reliably mmap a file using MAP_PRIVATE to | |
75 | a specific START address on either hpux or linux. First we see | |
76 | if mmap with MAP_PRIVATE works. If it does, we are off to the | |
b990f4bc | 77 | races. If it doesn't, we try an anonymous private mmap since the |
c621016b | 78 | kernel is more likely to honor the BASE address in anonymous maps. |
b990f4bc JDA |
79 | We then copy the data to the anonymous private map. This assumes |
80 | of course that we don't need to change the data in the PCH file | |
81 | after it is created. | |
c621016b JDA |
82 | |
83 | This approach obviously causes a performance penalty but there is | |
84 | little else we can do given the current PCH implementation. */ | |
85 | ||
86 | static int | |
9bff16b8 | 87 | hpux_gt_pch_use_address (void *base, size_t size, int fd, size_t offset) |
c621016b | 88 | { |
b990f4bc | 89 | void *addr; |
c621016b JDA |
90 | |
91 | /* We're called with size == 0 if we're not planning to load a PCH | |
92 | file at all. This allows the hook to free any static space that | |
93 | we might have allocated at link time. */ | |
94 | if (size == 0) | |
95 | return -1; | |
96 | ||
97 | /* Try to map the file with MAP_PRIVATE. */ | |
b990f4bc | 98 | addr = mmap (base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset); |
c621016b JDA |
99 | |
100 | if (addr == base) | |
101 | return 1; | |
102 | ||
103 | if (addr != (void *) MAP_FAILED) | |
104 | munmap (addr, size); | |
105 | ||
b990f4bc | 106 | /* Try to make an anonymous private mmap at the desired location. */ |
c621016b JDA |
107 | addr = mmap (base, size, PROT_READ | PROT_WRITE, |
108 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
109 | ||
110 | if (addr != base) | |
b990f4bc JDA |
111 | { |
112 | if (addr != (void *) MAP_FAILED) | |
113 | munmap (addr, size); | |
114 | return -1; | |
115 | } | |
c621016b | 116 | |
b990f4bc | 117 | if (lseek (fd, offset, SEEK_SET) == (off_t)-1) |
c621016b JDA |
118 | return -1; |
119 | ||
b3e30ec0 JDA |
120 | while (size) |
121 | { | |
122 | ssize_t nbytes; | |
123 | ||
124 | nbytes = read (fd, base, MIN (size, SSIZE_MAX)); | |
125 | if (nbytes <= 0) | |
126 | return -1; | |
127 | base = (char *) base + nbytes; | |
128 | size -= nbytes; | |
129 | } | |
c621016b JDA |
130 | |
131 | return 1; | |
132 | } | |
133 | ||
134 | \f | |
135 | const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; |