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/*
* Copyright (C) 2019 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <gtest/gtest.h>
#include <thread>
// Specify the LE access model explicitly. This file is compiled into the
// bionic-unit-tests executable, but the compiler sees an -fpic object file
// output into a static library, so it defaults to dynamic TLS accesses.
// This variable will be zero-initialized (.tbss)
__attribute__((tls_model("local-exec"))) static __thread int tlsvar_le_zero;
// This variable will have an initializer (.tdata)
__attribute__((tls_model("local-exec"))) static __thread int tlsvar_le_init = 10;
// Access libtest_elftls_shared_var's TLS variable using an IE access.
__attribute__((tls_model("initial-exec"))) extern "C" __thread int elftls_shared_var;
TEST(elftls, basic_le) {
// Check the variables on the main thread.
ASSERT_EQ(11, ++tlsvar_le_init);
ASSERT_EQ(1, ++tlsvar_le_zero);
// Check variables on a new thread.
std::thread([] {
ASSERT_EQ(11, ++tlsvar_le_init);
ASSERT_EQ(1, ++tlsvar_le_zero);
}).join();
}
TEST(elftls, shared_ie) {
ASSERT_EQ(21, ++elftls_shared_var);
std::thread([] {
ASSERT_EQ(21, ++elftls_shared_var);
}).join();
}
extern "C" int bump_static_tls_var_1();
extern "C" int bump_static_tls_var_2();
TEST(elftls, tprel_addend) {
ASSERT_EQ(4, bump_static_tls_var_1());
ASSERT_EQ(8, bump_static_tls_var_2());
std::thread([] {
ASSERT_EQ(4, bump_static_tls_var_1());
ASSERT_EQ(8, bump_static_tls_var_2());
}).join();
}
// Because this C++ source file is built with -fpic, the compiler will access
// this variable using a GD model. Typically, the static linker will relax the
// GD to LE, but the arm32 linker doesn't do TLS relaxations, so we can test
// calling __tls_get_addr in a static executable. The static linker knows that
// the main executable's TlsIndex::module_id is 1 and writes that into the GOT.
__thread int tlsvar_general = 30;
TEST(elftls, general) {
ASSERT_EQ(31, ++tlsvar_general);
std::thread([] {
ASSERT_EQ(31, ++tlsvar_general);
}).join();
}
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