73 lines
2.9 KiB
C++
73 lines
2.9 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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// This shared object test library is dlopen'ed by the main test executable.
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// Export a large TLS variable from a solib for testing dladdr and dlsym. The
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// TLS symbol's value will appear to overlap almost everything else in the
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// shared object, but dladdr must not return it.
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__thread char large_tls_var[4 * 1024 * 1024];
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extern "C" char* get_large_tls_var_addr() {
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return large_tls_var;
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}
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// For testing dladdr, return an address that's part of the solib's .bss
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// section, but does not have an entry in the dynsym table and whose
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// solib-relative address appears to overlap with the large TLS variable.
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extern "C" void* get_local_addr() {
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static char buf[1024];
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return &buf[512];
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}
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// This variable comes from libtest_elftls_shared_var.so, which is part of
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// static TLS. Verify that a GD-model access can access the variable.
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//
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// Accessing the static TLS variable from an solib prevents the static linker
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// from relaxing the GD access to IE and lets us test that __tls_get_addr and
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// the tlsdesc resolver handle a static TLS variable.
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extern "C" __thread int elftls_shared_var;
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extern "C" int bump_shared_var() {
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return ++elftls_shared_var;
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}
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// The static linker denotes the current module by omitting the symbol from
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// the DTPMOD/TLSDESC relocations.
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static __thread int local_var_1 = 15;
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static __thread int local_var_2 = 25;
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extern "C" int bump_local_vars() {
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return ++local_var_1 + ++local_var_2;
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}
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__attribute__((weak)) extern "C" __thread int missing_weak_dyn_tls;
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extern "C" int* missing_weak_dyn_tls_addr() {
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return &missing_weak_dyn_tls;
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}
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