cd510cbed9
Test: bionic-unit-tests --gtest_filter=link* Change-Id: Ib3f1e0fbc76fed9a5f27ffdd9bbf847a3e8d3665
116 lines
4.1 KiB
C++
116 lines
4.1 KiB
C++
/*
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* Copyright (C) 2017 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 <link.h>
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TEST(link, dl_iterate_phdr_early_exit) {
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static size_t call_count = 0;
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ASSERT_EQ(123, dl_iterate_phdr([](dl_phdr_info*, size_t, void*) { ++call_count; return 123; },
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nullptr));
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ASSERT_EQ(1u, call_count);
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}
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TEST(link, dl_iterate_phdr) {
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struct Functor {
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static int Callback(dl_phdr_info* i, size_t s, void* data) {
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reinterpret_cast<Functor*>(data)->DoChecks(i, s);
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return 0;
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}
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void DoChecks(dl_phdr_info* info, size_t s) {
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ASSERT_EQ(sizeof(dl_phdr_info), s);
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ASSERT_TRUE(info->dlpi_name != nullptr);
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// Find the first PT_LOAD program header so we can find the ELF header.
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for (ElfW(Half) i = 0; i < info->dlpi_phnum; ++i) {
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const ElfW(Phdr)* phdr = reinterpret_cast<const ElfW(Phdr)*>(&info->dlpi_phdr[i]);
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if (phdr->p_type == PT_LOAD) {
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const ElfW(Ehdr)* ehdr = reinterpret_cast<const ElfW(Ehdr)*>(info->dlpi_addr +
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phdr->p_vaddr);
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// Does it look like an ELF file?
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ASSERT_EQ(0, memcmp(ehdr, ELFMAG, SELFMAG));
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// Does the e_phnum match what dl_iterate_phdr told us?
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ASSERT_EQ(info->dlpi_phnum, ehdr->e_phnum);
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break;
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}
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}
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}
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size_t count;
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} f = {};
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ASSERT_EQ(0, dl_iterate_phdr(Functor::Callback, &f));
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}
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#if __arm__
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static uintptr_t read_exidx_func(uintptr_t* entry) {
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int32_t offset = *entry;
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// Sign-extend from int31 to int32.
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if ((offset & 0x40000000) != 0) {
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offset += -0x7fffffff - 1;
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}
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return reinterpret_cast<uintptr_t>(entry) + offset;
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}
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__attribute__((__unused__)) static void another_function_in_same_ELF_file() {}
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#endif
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TEST(link, dl_unwind_find_exidx) {
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#if __arm__
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int count = 0;
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struct eit_entry_t {
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uintptr_t one;
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uintptr_t two;
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};
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eit_entry_t* entries = reinterpret_cast<eit_entry_t*>(dl_unwind_find_exidx(
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reinterpret_cast<_Unwind_Ptr>(read_exidx_func), &count));
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ASSERT_TRUE(entries != nullptr);
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ASSERT_GT(count, 0);
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// Sanity checks
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uintptr_t func = reinterpret_cast<uintptr_t>(read_exidx_func);
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bool found = false;
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for (int i = 0; i < count; ++i) {
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// Entries must have bit 31 clear.
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ASSERT_TRUE((entries[i].one & (1<<31)) == 0);
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uintptr_t exidx_func = read_exidx_func(&entries[i].one);
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// If our function is compiled for thumb, exception table contains our address - 1.
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if (func == exidx_func || func == exidx_func + 1) found = true;
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// Entries must be sorted. Some addresses may appear twice if function
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// is compiled for arm.
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if (i > 0) {
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EXPECT_GE(exidx_func, read_exidx_func(&entries[i - 1].one)) << i;
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}
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}
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ASSERT_TRUE(found);
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#else
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GTEST_LOG_(INFO) << "dl_unwind_find_exidx is an ARM-only API\n";
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#endif
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}
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