Mercurial > hg > truffle
annotate src/share/vm/runtime/atomic.cpp @ 3832:46cb9a7b8b01
7073913: The fix for 7017193 causes segfaults
Summary: Buffer overflow in os::get_line_chars
Reviewed-by: coleenp, dholmes, dcubed
Contributed-by: aph@redhat.com
author | dsamersoff |
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date | Wed, 10 Aug 2011 15:04:21 +0400 |
parents | 7d9e451f5416 |
children | f08d439fab8c |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "runtime/atomic.hpp" | |
27 #ifdef TARGET_OS_FAMILY_linux | |
28 # include "os_linux.inline.hpp" | |
29 #endif | |
30 #ifdef TARGET_OS_FAMILY_solaris | |
31 # include "os_solaris.inline.hpp" | |
32 #endif | |
33 #ifdef TARGET_OS_FAMILY_windows | |
34 # include "os_windows.inline.hpp" | |
35 #endif | |
36 #ifdef TARGET_OS_ARCH_linux_x86 | |
37 # include "atomic_linux_x86.inline.hpp" | |
38 #endif | |
39 #ifdef TARGET_OS_ARCH_linux_sparc | |
40 # include "atomic_linux_sparc.inline.hpp" | |
41 #endif | |
42 #ifdef TARGET_OS_ARCH_linux_zero | |
43 # include "atomic_linux_zero.inline.hpp" | |
44 #endif | |
45 #ifdef TARGET_OS_ARCH_solaris_x86 | |
46 # include "atomic_solaris_x86.inline.hpp" | |
47 #endif | |
48 #ifdef TARGET_OS_ARCH_solaris_sparc | |
49 # include "atomic_solaris_sparc.inline.hpp" | |
50 #endif | |
51 #ifdef TARGET_OS_ARCH_windows_x86 | |
52 # include "atomic_windows_x86.inline.hpp" | |
53 #endif | |
3796 | 54 #ifdef TARGET_OS_ARCH_linux_arm |
55 # include "atomic_linux_arm.inline.hpp" | |
56 #endif | |
57 #ifdef TARGET_OS_ARCH_linux_ppc | |
58 # include "atomic_linux_ppc.inline.hpp" | |
59 #endif | |
0 | 60 |
61 jbyte Atomic::cmpxchg(jbyte exchange_value, volatile jbyte* dest, jbyte compare_value) { | |
62 assert(sizeof(jbyte) == 1, "assumption."); | |
63 uintptr_t dest_addr = (uintptr_t)dest; | |
64 uintptr_t offset = dest_addr % sizeof(jint); | |
65 volatile jint* dest_int = (volatile jint*)(dest_addr - offset); | |
66 jint cur = *dest_int; | |
67 jbyte* cur_as_bytes = (jbyte*)(&cur); | |
68 jint new_val = cur; | |
69 jbyte* new_val_as_bytes = (jbyte*)(&new_val); | |
70 new_val_as_bytes[offset] = exchange_value; | |
71 while (cur_as_bytes[offset] == compare_value) { | |
72 jint res = cmpxchg(new_val, dest_int, cur); | |
73 if (res == cur) break; | |
74 cur = res; | |
75 new_val = cur; | |
76 new_val_as_bytes[offset] = exchange_value; | |
77 } | |
78 return cur_as_bytes[offset]; | |
79 } | |
113
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80 |
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81 unsigned Atomic::xchg(unsigned int exchange_value, volatile unsigned int* dest) { |
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82 assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
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83 return (unsigned int)Atomic::xchg((jint)exchange_value, (volatile jint*)dest); |
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84 } |
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85 |
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86 unsigned Atomic::cmpxchg(unsigned int exchange_value, |
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87 volatile unsigned int* dest, unsigned int compare_value) { |
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88 assert(sizeof(unsigned int) == sizeof(jint), "more work to do"); |
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89 return (unsigned int)Atomic::cmpxchg((jint)exchange_value, (volatile jint*)dest, |
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90 (jint)compare_value); |
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91 } |
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92 |
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93 jlong Atomic::add(jlong add_value, volatile jlong* dest) { |
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94 jlong old = load(dest); |
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95 jlong new_value = old + add_value; |
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96 while (old != cmpxchg(new_value, dest, old)) { |
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97 old = load(dest); |
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98 new_value = old + add_value; |
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99 } |
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100 return old; |
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101 } |