1 /*
2 * Copyright (C) 2024 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 #include <stdint.h>
30
31 #include "CHECK.h"
32
33 struct AlignedVar {
34 int field;
35 char buffer[0x1000 - sizeof(int)];
36 } __attribute__((aligned(0x400)));
37
38 struct SmallVar {
39 int field;
40 char buffer[0xeee - sizeof(int)];
41 };
42
43 // The single .tdata section should have a size that isn't a multiple of its
44 // alignment.
45 __thread struct AlignedVar var1 = {13};
46 __thread struct AlignedVar var2 = {17};
47 __thread struct SmallVar var3 = {19};
48
var_addr(void * value)49 static uintptr_t var_addr(void* value) {
50 // Maybe the optimizer would assume that the variable has the alignment it is
51 // declared with.
52 asm volatile("" : "+r,m"(value) : : "memory");
53 return reinterpret_cast<uintptr_t>(value);
54 }
55
main()56 int main() {
57 CHECK((var_addr(&var1) & 0x3ff) == 0);
58 CHECK((var_addr(&var2) & 0x3ff) == 0);
59 CHECK(var1.field == 13);
60 CHECK(var2.field == 17);
61 CHECK(var3.field == 19);
62 return 0;
63 }
64