author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 06 Jul 2010 15:10:48 +0300 | |
changeset 30 | 5dc02b23752f |
parent 0 | 1918ee327afb |
permissions | -rw-r--r-- |
0 | 1 |
/* |
2 |
* Copyright (C) 2008 Apple Inc. All rights reserved. |
|
3 |
* |
|
4 |
* Redistribution and use in source and binary forms, with or without |
|
5 |
* modification, are permitted provided that the following conditions |
|
6 |
* are met: |
|
7 |
* 1. Redistributions of source code must retain the above copyright |
|
8 |
* notice, this list of conditions and the following disclaimer. |
|
9 |
* 2. Redistributions in binary form must reproduce the above copyright |
|
10 |
* notice, this list of conditions and the following disclaimer in the |
|
11 |
* documentation and/or other materials provided with the distribution. |
|
12 |
* |
|
13 |
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
|
14 |
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|
15 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
|
16 |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
|
17 |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
|
18 |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
|
19 |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
|
20 |
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
|
21 |
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
|
22 |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
|
23 |
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
|
24 |
*/ |
|
25 |
||
26 |
#include "config.h" |
|
27 |
||
28 |
#include "ExecutableAllocator.h" |
|
29 |
||
30
5dc02b23752f
Revision: 201025
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
0
diff
changeset
|
30 |
#if ENABLE(ASSEMBLER) && OS(UNIX) && !OS(SYMBIAN) |
0 | 31 |
|
32 |
#include <sys/mman.h> |
|
33 |
#include <unistd.h> |
|
34 |
#include <wtf/VMTags.h> |
|
35 |
||
36 |
namespace JSC { |
|
37 |
||
30
5dc02b23752f
Revision: 201025
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
0
diff
changeset
|
38 |
#if !(OS(DARWIN) && CPU(X86_64)) |
0 | 39 |
|
40 |
void ExecutableAllocator::intializePageSize() |
|
41 |
{ |
|
42 |
ExecutableAllocator::pageSize = getpagesize(); |
|
43 |
} |
|
44 |
||
45 |
ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t n) |
|
46 |
{ |
|
47 |
void* allocation = mmap(NULL, n, INITIAL_PROTECTION_FLAGS, MAP_PRIVATE | MAP_ANON, VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY, 0); |
|
48 |
if (allocation == MAP_FAILED) |
|
49 |
CRASH(); |
|
50 |
ExecutablePool::Allocation alloc = { reinterpret_cast<char*>(allocation), n }; |
|
51 |
return alloc; |
|
52 |
} |
|
53 |
||
54 |
void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc) |
|
55 |
{ |
|
56 |
int result = munmap(alloc.pages, alloc.size); |
|
57 |
ASSERT_UNUSED(result, !result); |
|
58 |
} |
|
59 |
||
30
5dc02b23752f
Revision: 201025
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
0
diff
changeset
|
60 |
#endif // !(OS(DARWIN) && CPU(X86_64)) |
0 | 61 |
|
62 |
#if ENABLE(ASSEMBLER_WX_EXCLUSIVE) |
|
63 |
void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting) |
|
64 |
{ |
|
65 |
if (!pageSize) |
|
66 |
intializePageSize(); |
|
67 |
||
68 |
// Calculate the start of the page containing this region, |
|
69 |
// and account for this extra memory within size. |
|
70 |
intptr_t startPtr = reinterpret_cast<intptr_t>(start); |
|
71 |
intptr_t pageStartPtr = startPtr & ~(pageSize - 1); |
|
72 |
void* pageStart = reinterpret_cast<void*>(pageStartPtr); |
|
73 |
size += (startPtr - pageStartPtr); |
|
74 |
||
75 |
// Round size up |
|
76 |
size += (pageSize - 1); |
|
77 |
size &= ~(pageSize - 1); |
|
78 |
||
79 |
mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX); |
|
80 |
} |
|
81 |
#endif |
|
82 |
||
83 |
} |
|
84 |
||
85 |
#endif // HAVE(ASSEMBLER) |