blob: e847669ee0815b01a33bcf7662a47f6dab37fd85 [file] [log] [blame]
Ryan Prichard45d13492019-01-03 02:51:30 -08001/*
2 * Copyright (C) 2019 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#pragma once
30
31#include <stdint.h>
32
33struct StaticTlsLayout {
34 constexpr StaticTlsLayout() {}
35
36private:
37 size_t offset_ = 0;
38 size_t alignment_ = 1;
39 bool overflowed_ = false;
40
41 // Offsets to various Bionic TLS structs from the beginning of static TLS.
42 size_t offset_bionic_tcb_ = SIZE_MAX;
43 size_t offset_bionic_tls_ = SIZE_MAX;
44
45public:
46 size_t offset_bionic_tcb() const { return offset_bionic_tcb_; }
47 size_t offset_bionic_tls() const { return offset_bionic_tls_; }
48
49 size_t size() const { return offset_; }
50 size_t alignment() const { return alignment_; }
51 bool overflowed() const { return overflowed_; }
52
53 void reserve_tcb();
54 void reserve_bionic_tls();
55 void finish_layout();
56
57private:
58 size_t reserve(size_t size, size_t alignment);
59
60 template <typename T> size_t reserve_type() {
61 return reserve(sizeof(T), alignof(T));
62 }
63
64 size_t round_up_with_overflow_check(size_t value, size_t alignment);
65};