blob: cec6791912e52428373e1b3997ed0d3b68682820 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
// 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) {
// Trigger the segfault.
asm volatile(
"movq $0, %%rax\n"
"movq $0x77777777, (%%rax)\n"
:
:
: "rax");
}
}
BENCHMARK(BM_FaultSignalFixup)->UseRealTime();
} // namespace
} // namespace testing
} // namespace gvisor
|
