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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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30 | 30 |
31 #include "globals.h" | 31 #include "globals.h" |
32 | 32 |
33 namespace v8 { | 33 namespace v8 { |
34 namespace internal { | 34 namespace internal { |
35 | 35 |
36 #if defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_X64) | 36 #if defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_X64) |
37 | 37 |
38 #define V8_FAST_TLS_SUPPORTED 1 | 38 #define V8_FAST_TLS_SUPPORTED 1 |
39 | 39 |
40 extern intptr_t kMacTlsBaseOffset; | |
41 | |
40 INLINE(intptr_t InternalGetExistingThreadLocal(intptr_t index)); | 42 INLINE(intptr_t InternalGetExistingThreadLocal(intptr_t index)); |
41 | 43 |
42 inline intptr_t InternalGetExistingThreadLocal(intptr_t index) { | 44 inline intptr_t InternalGetExistingThreadLocal(intptr_t index) { |
43 // The constants below are taken from pthreads.s from the XNU kernel | |
44 // sources archive at www.opensource.apple.com. | |
45 intptr_t result; | 45 intptr_t result; |
46 #if defined(V8_HOST_ARCH_IA32) | 46 #if defined(V8_HOST_ARCH_IA32) |
47 asm("movl %%gs:0x48(,%1,4), %0;" | 47 asm("movl %%gs:(%1,%2,4), %0;" |
48 :"=r"(result) // Output must be a writable register. | 48 :"=r"(result) // Output must be a writable register. |
49 :"0"(index)); // Input is the same as output. | 49 :"r"(kMacTlsBaseOffset), "r"(index)); |
Mark Mentovai
2011/04/01 16:37:16
You might do better by letting the output share a
Vitaly Repeshko
2011/04/01 16:47:55
GCC docs say the compiler is free to reuse a regis
| |
50 #else | 50 #else |
51 asm("movq %%gs:0x60(,%1,8), %0;" | 51 asm("movq %%gs:(%1,%2,8), %0;" |
52 :"=r"(result) | 52 :"=r"(result) |
53 :"0"(index)); | 53 :"r"(kMacTlsBaseOffset), "r"(index)); |
54 #endif | 54 #endif |
55 return result; | 55 return result; |
56 } | 56 } |
57 | 57 |
58 #endif | 58 #endif |
59 | 59 |
60 } } // namespace v8::internal | 60 } } // namespace v8::internal |
61 | 61 |
62 #endif // V8_PLATFORM_TLS_MAC_H_ | 62 #endif // V8_PLATFORM_TLS_MAC_H_ |
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