1/*
2 * Copyright (C) 2017 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#pragma once
27
28#if HAVE(FAST_TLS)
29
30#include <pthread.h>
31#include <System/pthread_machdep.h>
32
33namespace WTF {
34
35// KEY0 is taken by bmalloc.
36#define WTF_FAST_TLS_KEY0 __PTK_FRAMEWORK_JAVASCRIPTCORE_KEY1
37#define WTF_FAST_TLS_KEY1 __PTK_FRAMEWORK_JAVASCRIPTCORE_KEY2
38#define WTF_FAST_TLS_KEY2 __PTK_FRAMEWORK_JAVASCRIPTCORE_KEY3
39#define WTF_FAST_TLS_KEY3 __PTK_FRAMEWORK_JAVASCRIPTCORE_KEY4
40
41// NOTE: We should manage our use of these keys here. If you want to use a key for something,
42// put a #define in here to give your key a symbolic name, like we do for WTFThreadData.
43
44#define WTF_THREAD_DATA_KEY WTF_FAST_TLS_KEY0
45#define WTF_TESTING_KEY WTF_FAST_TLS_KEY3
46
47#if ENABLE(FAST_TLS_JIT)
48#if CPU(X86_64)
49inline uintptr_t loadFastTLS(unsigned offset)
50{
51 uintptr_t result;
52 asm volatile(
53 "movq %%gs:%1, %0"
54 : "=r"(result)
55 : "r"(offset)
56 : "memory");
57 return result;
58}
59#elif CPU(ARM64)
60inline uintptr_t loadFastTLS(unsigned offset)
61{
62 uintptr_t result;
63 asm volatile(
64 "mrs %0, TPIDRRO_EL0\n\t"
65 "and %0, %0, #0xfffffffffffffff8\n\t"
66 "ldr %0, [%0, %1]"
67 : "=r"(result)
68 : "r"(offset)
69 : "memory");
70 return result;
71}
72#else
73#error "Bad architecture"
74#endif
75#endif // ENABLE(FAST_TLS_JIT)
76
77inline unsigned fastTLSOffsetForKey(unsigned long slot)
78{
79 return slot * sizeof(void*);
80}
81
82} // namespace WTF
83
84#endif // HAVE(FAST_TLS)
85