62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
// Copyright 2020 The gVisor Authors.
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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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#include <signal.h>
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#include <string.h>
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#include "gtest/gtest.h"
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#include "benchmark/benchmark.h"
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#include "test/util/logging.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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void FixupHandler(int sig, siginfo_t* si, void* void_ctx) {
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static unsigned int dataval = 0;
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// Skip the offending instruction.
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ucontext_t* ctx = reinterpret_cast<ucontext_t*>(void_ctx);
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ctx->uc_mcontext.gregs[REG_RAX] = reinterpret_cast<greg_t>(&dataval);
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}
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void BM_FaultSignalFixup(benchmark::State& state) {
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// Set up the signal handler.
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struct sigaction sa = {};
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sigemptyset(&sa.sa_mask);
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sa.sa_sigaction = FixupHandler;
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sa.sa_flags = SA_SIGINFO;
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TEST_CHECK(sigaction(SIGSEGV, &sa, nullptr) == 0);
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// Fault, fault, fault.
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for (auto _ : state) {
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// Trigger the segfault.
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asm volatile(
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"movq $0, %%rax\n"
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"movq $0x77777777, (%%rax)\n"
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:
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:
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: "rax");
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}
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}
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BENCHMARK(BM_FaultSignalFixup)->UseRealTime();
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} // namespace
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} // namespace testing
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} // namespace gvisor
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