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// Copyright 2018 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.
package kernel
import (
"testing"
"gvisor.googlesource.com/gvisor/pkg/abi"
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
)
const (
maxTestSyscall = 1000
)
func createSyscallTable() *SyscallTable {
m := make(map[uintptr]Syscall)
for i := uintptr(0); i <= maxTestSyscall; i++ {
j := i
m[i] = Syscall{
Fn: func(*Task, arch.SyscallArguments) (uintptr, *SyscallControl, error) {
return j, nil, nil
},
}
}
s := &SyscallTable{
OS: abi.Linux,
Arch: arch.AMD64,
Table: m,
}
RegisterSyscallTable(s)
return s
}
func TestTable(t *testing.T) {
table := createSyscallTable()
defer func() {
// Cleanup registered tables to keep tests separate.
allSyscallTables = []*SyscallTable{}
}()
// Go through all functions and check that they return the right value.
for i := uintptr(0); i < maxTestSyscall; i++ {
fn := table.Lookup(i)
if fn == nil {
t.Errorf("Syscall %v is set to nil", i)
continue
}
v, _, _ := fn(nil, arch.SyscallArguments{})
if v != i {
t.Errorf("Wrong return value for syscall %v: expected %v, got %v", i, i, v)
}
}
// Check that values outside the range return nil.
for i := uintptr(maxTestSyscall + 1); i < maxTestSyscall+100; i++ {
fn := table.Lookup(i)
if fn != nil {
t.Errorf("Syscall %v is not nil: %v", i, fn)
continue
}
}
}
func BenchmarkTableLookup(b *testing.B) {
table := createSyscallTable()
b.ResetTimer()
j := uintptr(0)
for i := 0; i < b.N; i++ {
table.Lookup(j)
j = (j + 1) % 310
}
b.StopTimer()
// Cleanup registered tables to keep tests separate.
allSyscallTables = []*SyscallTable{}
}
func BenchmarkTableMapLookup(b *testing.B) {
table := createSyscallTable()
b.ResetTimer()
j := uintptr(0)
for i := 0; i < b.N; i++ {
table.mapLookup(j)
j = (j + 1) % 310
}
b.StopTimer()
// Cleanup registered tables to keep tests separate.
allSyscallTables = []*SyscallTable{}
}
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