75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
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/*
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* Copyright (C) 2024 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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// LLD tries not to generate a PT_TLS segment where (p_vaddr % p_align) is
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// non-zero. It can still do so if the p_align values are greater than a page.
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#include <stdint.h>
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#include <unistd.h>
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#include "CHECK.h"
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struct SmallVar {
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int field;
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char buffer[0x100 - sizeof(int)];
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};
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struct AlignedVar {
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int field;
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char buffer[0x20000 - sizeof(int)];
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} __attribute__((aligned(0x20000)));
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__thread struct SmallVar var1 = {13};
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__thread struct SmallVar var2 = {17};
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__thread struct AlignedVar var3;
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__thread struct AlignedVar var4;
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static uintptr_t var_addr(void* value) {
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// Maybe the optimizer would assume that the variable has the alignment it is
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// declared with.
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asm volatile("" : "+r,m"(value) : : "memory");
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return reinterpret_cast<uintptr_t>(value);
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}
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int main() {
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// Bionic only allocates ELF TLS blocks with up to page alignment.
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CHECK((var_addr(&var3) & (getpagesize() - 1)) == 0);
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CHECK((var_addr(&var4) & (getpagesize() - 1)) == 0);
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// TODO: These TLS accesses are broken with the current version of LLD. See
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// https://github.com/llvm/llvm-project/issues/84743.
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#if !defined(__riscv)
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CHECK(var1.field == 13);
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CHECK(var2.field == 17);
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#endif
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CHECK(var3.field == 0);
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CHECK(var4.field == 0);
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return 0;
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}
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