90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
/*
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* Copyright (C) 2019 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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#include <gtest/gtest.h>
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#include <thread>
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// Specify the LE access model explicitly. This file is compiled into the
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// bionic-unit-tests executable, but the compiler sees an -fpic object file
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// output into a static library, so it defaults to dynamic TLS accesses.
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// This variable will be zero-initialized (.tbss)
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__attribute__((tls_model("local-exec"))) static __thread int tlsvar_le_zero;
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// This variable will have an initializer (.tdata)
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__attribute__((tls_model("local-exec"))) static __thread int tlsvar_le_init = 10;
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// Access libtest_elftls_shared_var's TLS variable using an IE access.
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__attribute__((tls_model("initial-exec"))) extern "C" __thread int elftls_shared_var;
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TEST(elftls, basic_le) {
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// Check the variables on the main thread.
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ASSERT_EQ(11, ++tlsvar_le_init);
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ASSERT_EQ(1, ++tlsvar_le_zero);
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// Check variables on a new thread.
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std::thread([] {
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ASSERT_EQ(11, ++tlsvar_le_init);
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ASSERT_EQ(1, ++tlsvar_le_zero);
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}).join();
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}
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TEST(elftls, shared_ie) {
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ASSERT_EQ(21, ++elftls_shared_var);
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std::thread([] {
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ASSERT_EQ(21, ++elftls_shared_var);
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}).join();
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}
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extern "C" int bump_static_tls_var_1();
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extern "C" int bump_static_tls_var_2();
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TEST(elftls, tprel_addend) {
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ASSERT_EQ(4, bump_static_tls_var_1());
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ASSERT_EQ(8, bump_static_tls_var_2());
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std::thread([] {
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ASSERT_EQ(4, bump_static_tls_var_1());
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ASSERT_EQ(8, bump_static_tls_var_2());
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}).join();
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}
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// Because this C++ source file is built with -fpic, the compiler will access
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// this variable using a GD model. Typically, the static linker will relax the
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// GD to LE, but the arm32 linker doesn't do TLS relaxations, so we can test
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// calling __tls_get_addr in a static executable. The static linker knows that
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// the main executable's TlsIndex::module_id is 1 and writes that into the GOT.
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__thread int tlsvar_general = 30;
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TEST(elftls, general) {
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ASSERT_EQ(31, ++tlsvar_general);
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std::thread([] {
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ASSERT_EQ(31, ++tlsvar_general);
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}).join();
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}
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