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basic_machine.go
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161 lines (137 loc) · 3.92 KB
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package main
import (
"encoding/hex"
"errors"
"fmt"
"github.com/keystone-engine/keystone/bindings/go/keystone"
uc "github.com/unicorn-engine/unicorn/bindings/go/unicorn"
)
var beforeExecRegVals = map[string]uint64{}
type basicMachine struct {
sp int
sortedRegNames []string
regMap map[string]int
mu uc.Unicorn
byteSize int
}
func readFlagVals(flags uint64) map[string]int {
res := make(map[string]int)
// cf:0 zf:0 of:0 sf:0 pf:0 af:0 df:0
flagNames := []string{"cf", "zf", "of", "sf", "pf", "af", "df"}
var nameToBitMap = map[string]uint{
"cf": 0,
"pf": 2,
"af": 4,
"zf": 6,
"sf": 7,
"df": 10,
"of": 11,
}
for _, flagName := range flagNames {
bitPos := nameToBitMap[flagName]
res[flagName] = 0
if flags>>bitPos&1 > 0 {
res[flagName] = 1
}
}
return res
}
func (m basicMachine) displayRegisters() {
startLine := "----------------- cpu context -----------------"
fmt.Println(cyan(startLine))
for _, regName := range m.sortedRegNames {
if regName == "end" {
fmt.Println()
continue
}
reg := m.regMap[regName]
res, _ := m.mu.RegRead(reg)
resStr := fmt.Sprintf("%0#[1]*[2]x", m.byteSize*2, res)
beforeVal, ok := beforeExecRegVals[regName]
// pad the reg name to 3 bytes
paddedRegName := fillSpace(regName, 3)
if ok && beforeVal != res {
fmt.Printf("%v : %v ", purple(paddedRegName), red(resStr))
} else {
fmt.Printf("%v : %v ", purple(paddedRegName), resStr)
}
beforeExecRegVals[regName] = res
// flag register detail
if regName == "flags" {
flagValMap := readFlagVals(res)
fmt.Printf("(cf:%v zf:%v of:%v sf:%v pf:%v af:%v df:%v)",
flagValMap["cf"], flagValMap["zf"], flagValMap["of"], flagValMap["sf"], flagValMap["pf"], flagValMap["af"], flagValMap["df"])
}
}
}
func (m basicMachine) displayStack() {
startLine := "----------------- stack context -----------------"
fmt.Println(yellow(startLine))
readStartAddr := uint64(0x1300000 - m.byteSize*8)
readOffset := uint64(m.byteSize * 4 * 5)
bytesData, err := m.mu.MemRead(readStartAddr, readOffset)
if err != nil {
// TODO do some thing
}
spVal, _ := m.mu.RegRead(m.sp)
for i := 0; i < len(bytesData); i += m.byteSize {
if i%(m.byteSize*4) == 0 && i != 0 {
fmt.Println()
}
// the first line didn't change line
if i%(m.byteSize*4) == 0 {
fmt.Printf("%0#[1]*[2]x : ", m.byteSize*2, readStartAddr+uint64(i))
}
var reversedBytes = bytesData[i : i+m.byteSize]
for i := 0; i <= m.byteSize/2-1; i++ {
j := m.byteSize - 1 - i
reversedBytes[i], reversedBytes[j] = reversedBytes[j], reversedBytes[i]
}
currentAddr := readStartAddr + uint64(i)
if spVal == currentAddr {
fmt.Printf("%s ", red(hex.EncodeToString(reversedBytes[0:])))
} else {
fmt.Printf("%s ", hex.EncodeToString(reversedBytes[0:]))
}
}
fmt.Println()
}
/*
func assemble(mnemonic string) ([]byte, error) {
// TODO: What is the effect of the second argument(address) of Assemble
code, cnt, ok := keystone.Assemble(mnemonic, 0)
if !ok || cnt == 0 {
return nil, fmt.Errorf("Error: assemble instruction(%s)", mnemonic)
}
return code, nil
}
*/
func (m basicMachine) execute(cmd string) error {
/*
var args = []string{
"-a", "x86", cmd,
}
res, err := exec.Command("rasm2", args...).Output()
if err != nil {
fmt.Println(err)
}
*/
ks, _ := keystone.New(keystone.ARCH_X86, keystone.MODE_64)
ks.Option(keystone.OPT_SYNTAX, keystone.OPT_SYNTAX_INTEL)
res, cnt, ok := ks.Assemble(cmd, 0)
if !ok || cnt == 0 {
return errors.New("assemble failed")
}
//resStr := strings.Trim(string(res), "\n")
fmt.Printf("%v: %v\t%v: %v\n", purple("mnemonic"), cmd, purple("bytes"), res)
helperInfo()
//code, _ := hex.DecodeString(resStr)
// NOTICE
// push/pop rax commands must ensure that
// the rsp point into the range of memmap
m.mu.MemWrite(0x0000, res)
if err := m.mu.Start(0x0000, 0x0000+uint64(len(res))); err != nil {
fmt.Println(red(fmt.Sprintf("err : %v", err)))
}
return nil
}