forked from TrueCloudLab/restic
525 lines
13 KiB
Go
525 lines
13 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package bpf
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import (
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"fmt"
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"io/ioutil"
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"reflect"
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"strconv"
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"strings"
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"testing"
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)
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// This is a direct translation of the program in
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// testdata/all_instructions.txt.
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var allInstructions = []Instruction{
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LoadConstant{Dst: RegA, Val: 42},
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LoadConstant{Dst: RegX, Val: 42},
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LoadScratch{Dst: RegA, N: 3},
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LoadScratch{Dst: RegX, N: 3},
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LoadAbsolute{Off: 42, Size: 1},
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LoadAbsolute{Off: 42, Size: 2},
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LoadAbsolute{Off: 42, Size: 4},
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LoadIndirect{Off: 42, Size: 1},
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LoadIndirect{Off: 42, Size: 2},
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LoadIndirect{Off: 42, Size: 4},
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LoadMemShift{Off: 42},
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LoadExtension{Num: ExtLen},
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LoadExtension{Num: ExtProto},
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LoadExtension{Num: ExtType},
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LoadExtension{Num: ExtRand},
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StoreScratch{Src: RegA, N: 3},
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StoreScratch{Src: RegX, N: 3},
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ALUOpConstant{Op: ALUOpAdd, Val: 42},
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ALUOpConstant{Op: ALUOpSub, Val: 42},
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ALUOpConstant{Op: ALUOpMul, Val: 42},
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ALUOpConstant{Op: ALUOpDiv, Val: 42},
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ALUOpConstant{Op: ALUOpOr, Val: 42},
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ALUOpConstant{Op: ALUOpAnd, Val: 42},
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ALUOpConstant{Op: ALUOpShiftLeft, Val: 42},
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ALUOpConstant{Op: ALUOpShiftRight, Val: 42},
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ALUOpConstant{Op: ALUOpMod, Val: 42},
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ALUOpConstant{Op: ALUOpXor, Val: 42},
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ALUOpX{Op: ALUOpAdd},
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ALUOpX{Op: ALUOpSub},
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ALUOpX{Op: ALUOpMul},
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ALUOpX{Op: ALUOpDiv},
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ALUOpX{Op: ALUOpOr},
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ALUOpX{Op: ALUOpAnd},
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ALUOpX{Op: ALUOpShiftLeft},
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ALUOpX{Op: ALUOpShiftRight},
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ALUOpX{Op: ALUOpMod},
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ALUOpX{Op: ALUOpXor},
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NegateA{},
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Jump{Skip: 10},
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JumpIf{Cond: JumpEqual, Val: 42, SkipTrue: 8, SkipFalse: 9},
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JumpIf{Cond: JumpNotEqual, Val: 42, SkipTrue: 8},
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JumpIf{Cond: JumpLessThan, Val: 42, SkipTrue: 7},
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JumpIf{Cond: JumpLessOrEqual, Val: 42, SkipTrue: 6},
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JumpIf{Cond: JumpGreaterThan, Val: 42, SkipTrue: 4, SkipFalse: 5},
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JumpIf{Cond: JumpGreaterOrEqual, Val: 42, SkipTrue: 3, SkipFalse: 4},
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JumpIf{Cond: JumpBitsSet, Val: 42, SkipTrue: 2, SkipFalse: 3},
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TAX{},
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TXA{},
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RetA{},
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RetConstant{Val: 42},
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}
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var allInstructionsExpected = "testdata/all_instructions.bpf"
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// Check that we produce the same output as the canonical bpf_asm
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// linux kernel tool.
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func TestInterop(t *testing.T) {
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out, err := Assemble(allInstructions)
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if err != nil {
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t.Fatalf("assembly of allInstructions program failed: %s", err)
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}
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t.Logf("Assembled program is %d instructions long", len(out))
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bs, err := ioutil.ReadFile(allInstructionsExpected)
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if err != nil {
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t.Fatalf("reading %s: %s", allInstructionsExpected, err)
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}
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// First statement is the number of statements, last statement is
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// empty. We just ignore both and rely on slice length.
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stmts := strings.Split(string(bs), ",")
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if len(stmts)-2 != len(out) {
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t.Fatalf("test program lengths don't match: %s has %d, Go implementation has %d", allInstructionsExpected, len(stmts)-2, len(allInstructions))
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}
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for i, stmt := range stmts[1 : len(stmts)-2] {
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nums := strings.Split(stmt, " ")
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if len(nums) != 4 {
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t.Fatalf("malformed instruction %d in %s: %s", i+1, allInstructionsExpected, stmt)
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}
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actual := out[i]
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op, err := strconv.ParseUint(nums[0], 10, 16)
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if err != nil {
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t.Fatalf("malformed opcode %s in instruction %d of %s", nums[0], i+1, allInstructionsExpected)
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}
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if actual.Op != uint16(op) {
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t.Errorf("opcode mismatch on instruction %d (%#v): got 0x%02x, want 0x%02x", i+1, allInstructions[i], actual.Op, op)
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}
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jt, err := strconv.ParseUint(nums[1], 10, 8)
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if err != nil {
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t.Fatalf("malformed jt offset %s in instruction %d of %s", nums[1], i+1, allInstructionsExpected)
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}
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if actual.Jt != uint8(jt) {
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t.Errorf("jt mismatch on instruction %d (%#v): got %d, want %d", i+1, allInstructions[i], actual.Jt, jt)
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}
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jf, err := strconv.ParseUint(nums[2], 10, 8)
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if err != nil {
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t.Fatalf("malformed jf offset %s in instruction %d of %s", nums[2], i+1, allInstructionsExpected)
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}
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if actual.Jf != uint8(jf) {
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t.Errorf("jf mismatch on instruction %d (%#v): got %d, want %d", i+1, allInstructions[i], actual.Jf, jf)
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}
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k, err := strconv.ParseUint(nums[3], 10, 32)
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if err != nil {
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t.Fatalf("malformed constant %s in instruction %d of %s", nums[3], i+1, allInstructionsExpected)
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}
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if actual.K != uint32(k) {
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t.Errorf("constant mismatch on instruction %d (%#v): got %d, want %d", i+1, allInstructions[i], actual.K, k)
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}
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}
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}
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// Check that assembly and disassembly match each other.
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func TestAsmDisasm(t *testing.T) {
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prog1, err := Assemble(allInstructions)
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if err != nil {
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t.Fatalf("assembly of allInstructions program failed: %s", err)
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}
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t.Logf("Assembled program is %d instructions long", len(prog1))
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got, allDecoded := Disassemble(prog1)
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if !allDecoded {
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t.Errorf("Disassemble(Assemble(allInstructions)) produced unrecognized instructions:")
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for i, inst := range got {
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if r, ok := inst.(RawInstruction); ok {
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t.Logf(" insn %d, %#v --> %#v", i+1, allInstructions[i], r)
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}
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}
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}
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if len(allInstructions) != len(got) {
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t.Fatalf("disassembly changed program size: %d insns before, %d insns after", len(allInstructions), len(got))
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}
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if !reflect.DeepEqual(allInstructions, got) {
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t.Errorf("program mutated by disassembly:")
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for i := range got {
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if !reflect.DeepEqual(allInstructions[i], got[i]) {
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t.Logf(" insn %d, s: %#v, p1: %#v, got: %#v", i+1, allInstructions[i], prog1[i], got[i])
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}
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}
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}
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}
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type InvalidInstruction struct{}
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func (a InvalidInstruction) Assemble() (RawInstruction, error) {
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return RawInstruction{}, fmt.Errorf("Invalid Instruction")
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}
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func (a InvalidInstruction) String() string {
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return fmt.Sprintf("unknown instruction: %#v", a)
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}
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func TestString(t *testing.T) {
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testCases := []struct {
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instruction Instruction
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assembler string
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}{
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{
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instruction: LoadConstant{Dst: RegA, Val: 42},
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assembler: "ld #42",
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},
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{
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instruction: LoadConstant{Dst: RegX, Val: 42},
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assembler: "ldx #42",
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},
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{
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instruction: LoadConstant{Dst: 0xffff, Val: 42},
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assembler: "unknown instruction: bpf.LoadConstant{Dst:0xffff, Val:0x2a}",
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},
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{
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instruction: LoadScratch{Dst: RegA, N: 3},
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assembler: "ld M[3]",
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},
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{
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instruction: LoadScratch{Dst: RegX, N: 3},
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assembler: "ldx M[3]",
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},
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{
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instruction: LoadScratch{Dst: 0xffff, N: 3},
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assembler: "unknown instruction: bpf.LoadScratch{Dst:0xffff, N:3}",
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},
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{
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instruction: LoadAbsolute{Off: 42, Size: 1},
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assembler: "ldb [42]",
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},
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{
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instruction: LoadAbsolute{Off: 42, Size: 2},
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assembler: "ldh [42]",
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},
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{
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instruction: LoadAbsolute{Off: 42, Size: 4},
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assembler: "ld [42]",
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},
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{
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instruction: LoadAbsolute{Off: 42, Size: -1},
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assembler: "unknown instruction: bpf.LoadAbsolute{Off:0x2a, Size:-1}",
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},
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{
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instruction: LoadIndirect{Off: 42, Size: 1},
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assembler: "ldb [x + 42]",
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},
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{
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instruction: LoadIndirect{Off: 42, Size: 2},
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assembler: "ldh [x + 42]",
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},
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{
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instruction: LoadIndirect{Off: 42, Size: 4},
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assembler: "ld [x + 42]",
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},
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{
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instruction: LoadIndirect{Off: 42, Size: -1},
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assembler: "unknown instruction: bpf.LoadIndirect{Off:0x2a, Size:-1}",
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},
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{
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instruction: LoadMemShift{Off: 42},
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assembler: "ldx 4*([42]&0xf)",
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},
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{
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instruction: LoadExtension{Num: ExtLen},
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assembler: "ld #len",
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},
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{
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instruction: LoadExtension{Num: ExtProto},
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assembler: "ld #proto",
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},
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{
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instruction: LoadExtension{Num: ExtType},
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assembler: "ld #type",
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},
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{
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instruction: LoadExtension{Num: ExtPayloadOffset},
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assembler: "ld #poff",
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},
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{
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instruction: LoadExtension{Num: ExtInterfaceIndex},
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assembler: "ld #ifidx",
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},
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{
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instruction: LoadExtension{Num: ExtNetlinkAttr},
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assembler: "ld #nla",
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},
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{
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instruction: LoadExtension{Num: ExtNetlinkAttrNested},
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assembler: "ld #nlan",
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},
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{
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instruction: LoadExtension{Num: ExtMark},
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assembler: "ld #mark",
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},
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{
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instruction: LoadExtension{Num: ExtQueue},
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assembler: "ld #queue",
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},
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{
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instruction: LoadExtension{Num: ExtLinkLayerType},
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assembler: "ld #hatype",
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},
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{
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instruction: LoadExtension{Num: ExtRXHash},
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assembler: "ld #rxhash",
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},
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{
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instruction: LoadExtension{Num: ExtCPUID},
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assembler: "ld #cpu",
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},
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{
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instruction: LoadExtension{Num: ExtVLANTag},
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assembler: "ld #vlan_tci",
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},
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{
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instruction: LoadExtension{Num: ExtVLANTagPresent},
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assembler: "ld #vlan_avail",
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},
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{
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instruction: LoadExtension{Num: ExtVLANProto},
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assembler: "ld #vlan_tpid",
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},
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{
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instruction: LoadExtension{Num: ExtRand},
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assembler: "ld #rand",
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},
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{
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instruction: LoadAbsolute{Off: 0xfffff038, Size: 4},
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assembler: "ld #rand",
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},
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{
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instruction: LoadExtension{Num: 0xfff},
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assembler: "unknown instruction: bpf.LoadExtension{Num:4095}",
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},
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{
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instruction: StoreScratch{Src: RegA, N: 3},
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assembler: "st M[3]",
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},
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{
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instruction: StoreScratch{Src: RegX, N: 3},
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assembler: "stx M[3]",
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},
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{
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instruction: StoreScratch{Src: 0xffff, N: 3},
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assembler: "unknown instruction: bpf.StoreScratch{Src:0xffff, N:3}",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpAdd, Val: 42},
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assembler: "add #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpSub, Val: 42},
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assembler: "sub #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpMul, Val: 42},
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assembler: "mul #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpDiv, Val: 42},
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assembler: "div #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpOr, Val: 42},
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assembler: "or #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpAnd, Val: 42},
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assembler: "and #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpShiftLeft, Val: 42},
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assembler: "lsh #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpShiftRight, Val: 42},
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assembler: "rsh #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpMod, Val: 42},
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assembler: "mod #42",
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},
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{
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instruction: ALUOpConstant{Op: ALUOpXor, Val: 42},
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assembler: "xor #42",
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},
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{
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instruction: ALUOpConstant{Op: 0xffff, Val: 42},
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assembler: "unknown instruction: bpf.ALUOpConstant{Op:0xffff, Val:0x2a}",
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},
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{
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instruction: ALUOpX{Op: ALUOpAdd},
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assembler: "add x",
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},
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{
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instruction: ALUOpX{Op: ALUOpSub},
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assembler: "sub x",
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},
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{
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instruction: ALUOpX{Op: ALUOpMul},
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assembler: "mul x",
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},
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{
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instruction: ALUOpX{Op: ALUOpDiv},
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assembler: "div x",
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},
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{
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instruction: ALUOpX{Op: ALUOpOr},
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assembler: "or x",
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},
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{
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instruction: ALUOpX{Op: ALUOpAnd},
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assembler: "and x",
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},
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{
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instruction: ALUOpX{Op: ALUOpShiftLeft},
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assembler: "lsh x",
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},
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{
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instruction: ALUOpX{Op: ALUOpShiftRight},
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assembler: "rsh x",
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},
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{
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instruction: ALUOpX{Op: ALUOpMod},
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assembler: "mod x",
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},
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{
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instruction: ALUOpX{Op: ALUOpXor},
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assembler: "xor x",
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},
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{
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instruction: ALUOpX{Op: 0xffff},
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assembler: "unknown instruction: bpf.ALUOpX{Op:0xffff}",
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},
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{
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instruction: NegateA{},
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assembler: "neg",
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},
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{
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instruction: Jump{Skip: 10},
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assembler: "ja 10",
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},
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{
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instruction: JumpIf{Cond: JumpEqual, Val: 42, SkipTrue: 8, SkipFalse: 9},
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assembler: "jeq #42,8,9",
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},
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{
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instruction: JumpIf{Cond: JumpEqual, Val: 42, SkipTrue: 8},
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assembler: "jeq #42,8",
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},
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{
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instruction: JumpIf{Cond: JumpEqual, Val: 42, SkipFalse: 8},
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assembler: "jneq #42,8",
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},
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{
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instruction: JumpIf{Cond: JumpNotEqual, Val: 42, SkipTrue: 8},
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assembler: "jneq #42,8",
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},
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{
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instruction: JumpIf{Cond: JumpLessThan, Val: 42, SkipTrue: 7},
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assembler: "jlt #42,7",
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},
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{
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instruction: JumpIf{Cond: JumpLessOrEqual, Val: 42, SkipTrue: 6},
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assembler: "jle #42,6",
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},
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{
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instruction: JumpIf{Cond: JumpGreaterThan, Val: 42, SkipTrue: 4, SkipFalse: 5},
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assembler: "jgt #42,4,5",
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},
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{
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instruction: JumpIf{Cond: JumpGreaterThan, Val: 42, SkipTrue: 4},
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assembler: "jgt #42,4",
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},
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{
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instruction: JumpIf{Cond: JumpGreaterOrEqual, Val: 42, SkipTrue: 3, SkipFalse: 4},
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assembler: "jge #42,3,4",
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},
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{
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instruction: JumpIf{Cond: JumpGreaterOrEqual, Val: 42, SkipTrue: 3},
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assembler: "jge #42,3",
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},
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{
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instruction: JumpIf{Cond: JumpBitsSet, Val: 42, SkipTrue: 2, SkipFalse: 3},
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assembler: "jset #42,2,3",
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},
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{
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instruction: JumpIf{Cond: JumpBitsSet, Val: 42, SkipTrue: 2},
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assembler: "jset #42,2",
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},
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{
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instruction: JumpIf{Cond: JumpBitsNotSet, Val: 42, SkipTrue: 2, SkipFalse: 3},
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assembler: "jset #42,3,2",
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},
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{
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instruction: JumpIf{Cond: JumpBitsNotSet, Val: 42, SkipTrue: 2},
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assembler: "jset #42,0,2",
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},
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{
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instruction: JumpIf{Cond: 0xffff, Val: 42, SkipTrue: 1, SkipFalse: 2},
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assembler: "unknown instruction: bpf.JumpIf{Cond:0xffff, Val:0x2a, SkipTrue:0x1, SkipFalse:0x2}",
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},
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{
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instruction: TAX{},
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assembler: "tax",
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},
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{
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instruction: TXA{},
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assembler: "txa",
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},
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{
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instruction: RetA{},
|
|
assembler: "ret a",
|
|
},
|
|
{
|
|
instruction: RetConstant{Val: 42},
|
|
assembler: "ret #42",
|
|
},
|
|
// Invalid instruction
|
|
{
|
|
instruction: InvalidInstruction{},
|
|
assembler: "unknown instruction: bpf.InvalidInstruction{}",
|
|
},
|
|
}
|
|
|
|
for _, testCase := range testCases {
|
|
if input, ok := testCase.instruction.(fmt.Stringer); ok {
|
|
got := input.String()
|
|
if got != testCase.assembler {
|
|
t.Errorf("String did not return expected assembler notation, expected: %s, got: %s", testCase.assembler, got)
|
|
}
|
|
} else {
|
|
t.Errorf("Instruction %#v is not a fmt.Stringer", testCase.instruction)
|
|
}
|
|
}
|
|
}
|