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 // LLD tries not to generate a PT_TLS segment where (p_vaddr % p_align) is
30 // non-zero. It can still do so if the p_align values are greater than a page.
31
32 #include <stdint.h>
33 #include <unistd.h>
34
35 #include "CHECK.h"
36
37 struct SmallVar {
38 int field;
39 char buffer[0x100 - sizeof(int)];
40 };
41
42 struct AlignedVar {
43 int field;
44 char buffer[0x20000 - sizeof(int)];
45 } __attribute__((aligned(0x20000)));
46
47 __thread struct SmallVar var1 = {13};
48 __thread struct SmallVar var2 = {17};
49 __thread struct AlignedVar var3;
50 __thread struct AlignedVar var4;
51
var_addr(void * value)52 static uintptr_t var_addr(void* value) {
53 // Maybe the optimizer would assume that the variable has the alignment it is
54 // declared with.
55 asm volatile("" : "+r,m"(value) : : "memory");
56 return reinterpret_cast<uintptr_t>(value);
57 }
58
main()59 int main() {
60 // Bionic only allocates ELF TLS blocks with up to page alignment.
61 CHECK((var_addr(&var3) & (getpagesize() - 1)) == 0);
62 CHECK((var_addr(&var4) & (getpagesize() - 1)) == 0);
63
64 // TODO: These TLS accesses are broken with the current version of LLD. See
65 // https://github.com/llvm/llvm-project/issues/84743.
66 #if !defined(__riscv)
67 CHECK(var1.field == 13);
68 CHECK(var2.field == 17);
69 #endif
70
71 CHECK(var3.field == 0);
72 CHECK(var4.field == 0);
73 return 0;
74 }
75