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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <signal.h>
#include <string.h>
#include "gtest/gtest.h"
#include "benchmark/benchmark.h"
#include "test/util/logging.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
void FixupHandler(int sig, siginfo_t* si, void* void_ctx) {
static unsigned int dataval = 0;
// Skip the offending instruction.
ucontext_t* ctx = reinterpret_cast<ucontext_t*>(void_ctx);
ctx->uc_mcontext.gregs[REG_RAX] = reinterpret_cast<greg_t>(&dataval);
}
void BM_FaultSignalFixup(benchmark::State& state) {
// Set up the signal handler.
struct sigaction sa = {};
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = FixupHandler;
sa.sa_flags = SA_SIGINFO;
TEST_CHECK(sigaction(SIGSEGV, &sa, nullptr) == 0);
// Fault, fault, fault.
for (auto _ : state) {
register volatile unsigned int* ptr asm("rax");
// Trigger the segfault.
ptr = nullptr;
*ptr = 0;
}
}
BENCHMARK(BM_FaultSignalFixup)->UseRealTime();
} // namespace
} // namespace testing
} // namespace gvisor
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