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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 testutil provides common assembly stubs for testing.
package testutil
import (
"fmt"
"strings"
)
// Getpid executes a trivial system call.
func Getpid()
// Touch touches the value in the first register.
func Touch()
// SyscallLoop executes a syscall and loops.
func SyscallLoop()
// SpinLoop spins on the CPU.
func SpinLoop()
// HaltLoop immediately halts and loops.
func HaltLoop()
// TwiddleRegsFault twiddles registers then faults.
func TwiddleRegsFault()
// TwiddleRegsSyscall twiddles registers then executes a syscall.
func TwiddleRegsSyscall()
// TwiddleSegments reads segments into known registers.
func TwiddleSegments()
// FloatingPointWorks is a floating point test.
//
// It returns true or false.
func FloatingPointWorks() bool
// RegisterMismatchError is used for checking registers.
type RegisterMismatchError []string
// Error returns a human-readable error.
func (r RegisterMismatchError) Error() string {
return strings.Join([]string(r), ";")
}
// addRegisterMisatch allows simple chaining of register mismatches.
func addRegisterMismatch(err error, reg string, got, expected interface{}) error {
errStr := fmt.Sprintf("%s got %08x, expected %08x", reg, got, expected)
switch r := err.(type) {
case nil:
// Return a new register mismatch.
return RegisterMismatchError{errStr}
case RegisterMismatchError:
// Append the error.
r = append(r, errStr)
return r
default:
// Leave as is.
return err
}
}
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