19b2ce8f38
This actually breaks *all* the tests, because the bionic-unit-tests binary crashes while running this ifunc before hwasan is set up. A longer term fix would be to have the compiler insert a call to __hwasan_init at the start of any ifunc resolvers. Bug: 135772972 Test: ran tests on a hwasan build Change-Id: I424b3035e1f76aa4b98c11346825b9ed140584ba
87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <gtest/gtest.h>
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#include <sys/auxv.h>
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#if defined(__BIONIC__)
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#include <sys/ifunc.h>
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#endif
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typedef int (*fn_ptr_t)();
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int ret42() {
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return 42;
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}
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extern "C" fn_ptr_t resolver() {
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return ret42;
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}
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int ifunc() __attribute__((ifunc("resolver")));
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TEST(ifunc, function) {
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ASSERT_EQ(42, ifunc());
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}
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#if defined(__BIONIC__)
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#if defined(__aarch64__)
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static uint64_t g_hwcap;
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static __ifunc_arg_t g_arg;
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extern "C" fn_ptr_t hwcap_resolver(uint64_t hwcap, __ifunc_arg_t* arg)
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__attribute__((no_sanitize("hwaddress"))) {
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g_hwcap = hwcap;
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g_arg = *arg;
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return ret42;
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}
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#elif defined(__arm__)
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static unsigned long g_hwcap;
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extern "C" fn_ptr_t hwcap_resolver(unsigned long hwcap) {
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g_hwcap = hwcap;
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return ret42;
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}
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#else
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extern "C" fn_ptr_t hwcap_resolver() {
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return ret42;
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}
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#endif
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int hwcap() __attribute__((ifunc("hwcap_resolver")));
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TEST(ifunc, hwcap) {
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ASSERT_EQ(42, hwcap());
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#if defined(__aarch64__)
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EXPECT_EQ(getauxval(AT_HWCAP) | _IFUNC_ARG_HWCAP, g_hwcap);
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EXPECT_EQ(sizeof(__ifunc_arg_t), g_arg._size);
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EXPECT_EQ(getauxval(AT_HWCAP), g_arg._hwcap);
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EXPECT_EQ(getauxval(AT_HWCAP2), g_arg._hwcap2);
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#elif defined(__arm__)
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EXPECT_EQ(getauxval(AT_HWCAP), g_hwcap);
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#endif
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}
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#endif // defined(__BIONIC__)
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