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emulator.go
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emulator.go
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package main
import (
// "errors"
"fmt"
"time"
// "github.com/fatih/color"
"io"
)
// 32bit registers
const (
EAX = 0
ECX = 1
EDX = 2
EBX = 3
ESP = 4
EBP = 5
ESI = 6
EDI = 7
)
// 16bit register
const (
AX = EAX
CX = ECX
DX = EDX
BX = EBX
SP = ESP
BP = EBP
SI = ESI
DI = EDI
)
// 8bit register
const (
AL = EAX
CL = ECX
DL = EDX
BL = EBX
AH = AL + 4
CH = CL + 4
DH = DL + 4
BH = BL + 4
)
// segment register
const (
ES = 0
CS = 1
SS = 2
DS = 3
GS = 5
)
//
// Controll Register
const (
CR4PageSizeExtension = 0x10
CR0PagingFlag = 0x1 << 31
)
const (
// EBDABase is an address of struct mp
EBDABase = uint32(0x600)
// MpConfigTableBase is and address of struct mpconf
// TODO: I need check
MpConfigTableBase = uint32(0x700)
// LocalAPICBase is ...
LocalAPICBase = uint32(0xFEC80000)
// IOAPICBase is ...
IOAPICBase = uint32(0xFEC00000)
// PHYSTOP is ...
PHYSTOP = uint32(0xE000000)
// DEVSPACE is ...
DEVSPACE = uint32(0xFE000000)
)
// TaskRegister contains offset of GDT, TSS base and TSS Limit
type TaskRegister struct {
gdtOffset uint16 // offset in GDT
TSSBase uint32 // Base Address of Task State Segment
TSSLimit uint32 // Size of Task Steate Segment
}
// TaskState is ...
type TaskState struct {
esp0 uint32
ss0 uint16
iomb uint16
}
// Emulator is an i386 Virtual Machine
type Emulator struct {
registers [8]uint32 // general registers
cr [16]uint32 // controll registers
sreg [6]uint32 // segment registers
tr TaskRegister // task register
taskState TaskState // task state
eflags Eflags // eflags
gdtrSize uint16 // global table descriptor table's size
gdtrBase uint32 // global table descriptor table's base phys address
idtrSize uint16 // interrupt table descriptor table's size
idtrBase uint32 // interrupt table descriptor table's base phys address
memory []uint8 // physical memory
eip uint32 // program counter
isSilent bool // silent mode
reader io.Reader
writer io.Writer
io IO
operandSizeOverride bool // true if operand size override (0x66) is enabled
genuineProtectedEnable bool // procted mode is refreshed only when sreg is changed
PageSizeExtensionEable bool // CR4PageSizeExtension Enable
disasm map[uint64]string // disasmed code (ex. 32255 -> "0000 add [bx+si],al")
}
func getMpConf() [72]byte {
var mpconf [72]byte
// configuration table header (struct mpconf)
mpconf[0] = 'P' // signature
mpconf[1] = 'C' // signature
mpconf[2] = 'M' // signature
mpconf[3] = 'P' // signature
mpconf[4] = 72 // FIXME: length
mpconf[5] = 0 // FIXME: length
mpconf[6] = 1 // version
mpconf[7] = 0 // FIXME: checksum
mpconf[8] = 0 // product id (uchar [20])
mpconf[28] = 0 // OEM table pointer
mpconf[32] = 0 // OEM OEM table length
mpconf[34] = 0 // entry count
mpconf[36] = uint8((LocalAPICBase >> 0) & 0XFF) // FIXME: adress of local APIC
mpconf[37] = uint8((LocalAPICBase >> 8) & 0XFF) // FIXME: adress of local APIC
mpconf[38] = uint8((LocalAPICBase >> 16) & 0XFF) // FIXME: adress of local APIC
mpconf[39] = uint8((LocalAPICBase >> 24) & 0XFF) // FIXME: adress of local APIC
mpconf[40] = 0 // extended table length
mpconf[42] = 0 // extended table checksum
mpconf[43] = 0 // reserved
// processor table entry (struct mpproc)
mpconf[44] = 0 // entry type(0)
mpconf[45] = 1 // FIXME: local APIC id
mpconf[46] = 1 // local APIC version
mpconf[47] = 0 // CPU flags
mpconf[48] = 0 // CPU signature
mpconf[49] = 0 // CPU signature
mpconf[50] = 0 // CPU signature
mpconf[51] = 0 // CPU signature
mpconf[52] = 0 // feature flags from CPUID instruction
mpconf[53] = 0 // feature flags from CPUID instruction
mpconf[54] = 0 // feature flags from CPUID instruction
mpconf[55] = 0 // feature flags from CPUID instruction
mpconf[56] = 0 // reserved
mpconf[57] = 0 // reserved
mpconf[58] = 0 // reserved
mpconf[59] = 0 // reserved
mpconf[60] = 0 // reserved
mpconf[61] = 0 // reserved
mpconf[62] = 0 // reserved
mpconf[63] = 0 // reserved
// I/O APIC table entry (struct mpioapic)
mpconf[64] = 2 // entry type(2)
mpconf[65] = 1 // I/O APIC id
mpconf[66] = 1 // I/O APIC version
mpconf[67] = 0 // I/O APIC flags
mpconf[68] = uint8((IOAPICBase >> 0) & 0XFF) // I/O APIC address
mpconf[69] = uint8((IOAPICBase >> 8) & 0XFF) // I/O APIC address
mpconf[70] = uint8((IOAPICBase >> 16) & 0XFF) // I/O APIC address
mpconf[71] = uint8((IOAPICBase >> 24) & 0XFF) // I/O APIC address
// setup checksum for (struct mpconf)
s := uint8(0)
for i := uint32(0); i < uint32(mpconf[4]); i++ {
s = s + mpconf[i]
}
mpconf[7] = uint8(0 - s)
return mpconf
}
func getEBDA() [16]byte {
ebda := [16]byte{
'_', 'M', 'P', '_', // signature _MP_
uint8((MpConfigTableBase >> 0) & 0XFF), // phys addr of MP config table
uint8((MpConfigTableBase >> 8) & 0XFF),
uint8((MpConfigTableBase >> 16) & 0XFF),
uint8((MpConfigTableBase >> 24) & 0XFF),
1, // length 1
1, // specrev [14]
0, // checksum
0, // type
0, // imcrp
0, 0, 0, // reserved
}
// setup checksum for (struct mp)
s := uint8(0)
for i := uint32(0); i < 16; i++ {
s = s + ebda[i]
}
ebda[10] = uint8(0 - s)
return ebda
}
// NewEmulator creates New Emulator
func NewEmulator(memorySize, eip, esp uint32, protectedMode, isSilent bool, reader io.Reader, writer io.Writer, disasm map[uint64]string) *Emulator {
e := &Emulator{
memory: make([]uint8, PHYSTOP),
eip: eip,
isSilent: isSilent,
reader: reader,
writer: writer,
disasm: disasm,
}
e.registers[EAX] = 0xaa55
e.registers[EDX] = 0x80
e.registers[ESP] = esp
e.cr[0] = 0x10
e.io = NewIO(&reader, &writer)
e.eflags = 2
if protectedMode {
e.cr[0] |= 1
e.genuineProtectedEnable = true
}
// setup BDA (BIOS Data Area)
e.memory[0x040E] = uint8(EBDABase >> 4)
e.memory[0x040F] = uint8(EBDABase >> 12)
// setup EBDA (struct mp) at EBDABase
printf("EBDA address=0x%X\n", ((uint32(e.memory[0x040f])<<8)|uint32(e.memory[0x040e]))<<4)
for i, val := range getEBDA() {
e.memory[EBDABase+uint32(i)] = val
}
// setup (struct mpconf) at MpConfigTableBase
for i, val := range getMpConf() {
e.memory[MpConfigTableBase+uint32(i)] = val
}
return e
}
// emulate instruction
func (e *Emulator) execInst() error {
switch e.getCode8(0) {
case 0x01:
e.addRm32R32()
case 0x03:
e.addR32Rm32()
case 0x05:
e.addEaxImm32()
case 0x09:
e.orRm32R32()
case 0x0B:
e.orR32Rm32()
case 0x0D:
e.orEaxImm32()
case 0x0F:
e.code0f()
case 0x25:
if (e.genuineProtectedEnable && !e.operandSizeOverride) || (!e.genuineProtectedEnable && e.operandSizeOverride) {
e.andEaxImm32()
} else {
e.andAxImm16()
}
case 0x29:
e.subRm32R32()
case 0x2D:
e.subEaxImm32()
case 0x31:
if (e.genuineProtectedEnable && !e.operandSizeOverride) || (!e.genuineProtectedEnable && e.operandSizeOverride) {
e.xorRm32R32()
} else {
e.xorRm16R16()
}
case 0x38:
e.cmpRm8R8()
case 0x39:
e.cmpRm32R32()
case 0x3b:
e.cmpR32Rm32()
case 0x3c:
e.cmpAlImm8()
case 0x3d:
e.cmpEaxImm32()
case 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47:
e.incR32()
case 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f:
e.decR32()
case 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57:
e.pushR32()
case 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f:
e.popR32()
case 0x66:
e.operandSizeOverride = true
e.eip++
e.execInst()
e.operandSizeOverride = false
case 0x68:
if (e.genuineProtectedEnable && !e.operandSizeOverride) || (!e.genuineProtectedEnable && e.operandSizeOverride) {
e.pushImm32()
} else {
e.pushImm16()
}
case 0x69:
e.imulR32Rm32Imm32()
case 0x6a:
e.pushImm8()
case 0x6d:
e.insd()
case 0x71:
e.jno()
case 0x72:
e.jb()
case 0x73:
e.jae()
case 0x74:
e.jz()
case 0x75:
e.jnz()
case 0x76:
e.jna()
case 0x77:
e.ja()
case 0x78:
e.js()
case 0x79:
e.jns()
case 0x84:
e.testRm8R8()
case 0x85:
e.testRm32R32()
case 0x7A:
e.jp()
case 0x7B:
e.jpo()
case 0x7C:
e.jl()
case 0x7D:
e.jc()
case 0x7E:
e.jng()
case 0x7F:
e.jg()
case 0x80:
e.code80()
// e.orRm8Imm8()
case 0x81:
e.code81()
case 0x83:
e.code83()
case 0x87:
e.xchg()
case 0x88:
e.movRm8R8()
case 0x89:
e.movRm32R32()
case 0x9C:
e.pushf()
case 0x8A:
e.movR8Rm8()
case 0x8B:
e.movR32Rm32()
case 0x8D:
e.leaR32Rm32()
case 0xA1:
e.movEaxMoffs32()
case 0xA3:
e.movMoffs32Eax()
case 0xA4:
e.movsb()
case 0xA8:
e.testAlImm8()
case 0xA9:
if (e.genuineProtectedEnable && !e.operandSizeOverride) || (!e.genuineProtectedEnable && e.operandSizeOverride) {
e.testEaxImm32()
} else {
e.testAxImm16()
}
case 0x8E:
e.movSregRm16() // 16 bit mode
case 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7:
e.movR8Imm8()
case 0x90:
e.nop()
case 0xAA:
e.stosb()
case 0xAB:
e.stosd()
case 0xC1:
e.codeC1()
case 0xC3:
e.ret()
case 0xC6:
e.movRm8Imm8()
case 0xC7:
e.movRm32Imm32()
case 0xC9:
e.leave()
case 0xCD:
e.intImm8()
case 0xEB:
e.shortJmp()
case 0xE4:
e.inAlImm8()
case 0xE5:
if e.genuineProtectedEnable {
e.inEaxImm8()
} else {
e.inAxImm8()
}
case 0xE6:
e.outAlImm8()
case 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF:
if (e.genuineProtectedEnable && !e.operandSizeOverride) || (!e.genuineProtectedEnable && e.operandSizeOverride) {
e.movR32Imm32()
} else {
e.movR16Imm16()
}
case 0xE8:
if (e.genuineProtectedEnable && !e.operandSizeOverride) || (!e.genuineProtectedEnable && e.operandSizeOverride) {
e.callRel32()
} else {
e.callRel16()
}
case 0xE9:
e.jmpRel32()
case 0xEA:
e.farJmp()
case 0xEC:
e.inAlDx()
case 0xEE:
e.outAlDx()
case 0xEF:
e.outAxDx()
case 0xF3:
// rep prefix
ecx := e.getRegister32(ECX)
// printf("repeat %d times. ", ecx)
if ecx > 1 {
e.eip++
// printf("eip=0x%x code=0x%x\n", e.eip, e.getCode8(0))
e.execInst()
// printf("The exec of %d loop finished.\n", ecx)
e.decRegister32(ECX, 1)
e.eip -= 2
// printf("Next eip=0x%x(0x%x) paddr of pdtentry=0x%x code=0x%x ecx=0x%x\n",
// e.eip, e.v2p(e.eip),
// (e.cr[3]>>22)+4*(e.eip>>22),
// e.getCode8(0), e.getRegister32(ECX))
} else if ecx == 1 {
e.eip++
// printf("eip=0x%x code=0x%x\n", e.eip, e.getCode8(0))
e.execInst()
e.decRegister32(ECX, 1)
} else {
e.eip += 2
}
case 0xF4:
e.halt()
case 0xF6:
e.testRm8Imm8()
case 0xF7:
e.codeF7()
case 0xFA:
e.cli()
case 0xFB:
e.sti()
case 0xFC:
e.cld()
case 0xF0:
// lock
e.eip++
case 0xFF:
e.codeFf()
default:
return fmt.Errorf("eip=0x%x(0x%x) opecode = %x is not implemented at execInst()", e.eip, e.v2p(e.eip), e.getCode8(0))
}
// Jump to Interrupt Handler described in IDT
// Timer: # of vector is T_IRQ0 + IRQ_TIMER = 32
if e.eip == 0x80103ca7 && e.eflags.isEnable(InterruptFlag) {
printf("Insert Timer Interrupt @emu\n");
}
return nil
}
func (e *Emulator) nop() {
e.eip++
}
func (e *Emulator) stosb() {
address := e.getRegister32(EDI)
value := e.getRegister8(AL)
e.setMemory8(address, value)
if e.eflags.isEnable(DirectionFlag) {
e.decRegister32(EDI, 1)
} else {
e.incRegister32(EDI, 1)
}
e.eip++
}
func (e *Emulator) stosd() {
address := e.getRegister32(EDI)
value := e.getRegister32(EAX)
// printf("stodsd address=0x%x(0x%x) value=0x%x\n", address, e.v2p(address), value)
e.setMemory32(address, value)
if e.eflags.isEnable(DirectionFlag) {
e.decRegister32(EDI, 4)
} else {
e.incRegister32(EDI, 4)
}
e.eip++
}
func (e *Emulator) insd() {
ioAddress := e.getRegister16(DX)
value := e.io.in32(ioAddress)
memAddress := e.getRegister32(EDI)
// printf("(insd) input 0x%08x from io[0x%x] to memory[paddr=0x%x vaddr=0x%x]\n",
// value, ioAddress, memAddress, e.v2p(memAddress))
e.setMemory32(memAddress, value)
e.incRegister32(EDI, 4)
e.eip++
}
func (e *Emulator) cli() {
e.eflags.unset(InterruptFlag)
e.eip++
}
func (e *Emulator) sti() {
e.eflags.set(InterruptFlag)
e.eip++
// printf("Enable Interruput Flag by sti inst.\n")
time.Sleep(5 * time.Second)
}
func (e *Emulator) cld() {
e.eflags.unset(DirectionFlag)
e.eip++
}
// eip=801005f6 opecode = 0 is not implemented.
func (e *Emulator) codeF7() {
testRm32Imm32 := func(e *Emulator, m ModRM) {
value := e.getCode32(0)
e.eip += 4
result := e.getRm32(m) & value
if result == 0 {
e.eflags.set(ZeroFlag)
} else {
e.eflags.unset(ZeroFlag)
}
e.eflags.unset(CarryFlag)
e.eflags.unset(OverflowFlag)
e.eflags.updatePF(uint8(result & 0xFF))
}
negRm32 := func(e *Emulator, m ModRM) {
value := e.getRm32(m)
e.setRm32(m, (^value)+1)
}
divRm32 := func(e *Emulator, m ModRM) {
// x/y = a ... b
x := (uint64(e.getRegister32(EDX)) << 32) | uint64(e.getRegister32(EAX))
y := uint64(e.getRm32(m))
a := uint32(x / y)
b := uint32(x % y)
e.setRegister32(EAX, a)
e.setRegister32(EDX, b)
}
e.eip++
m := e.parseModRM()
if e.genuineProtectedEnable == false && e.operandSizeOverride == false ||
e.genuineProtectedEnable == true && e.operandSizeOverride == true {
panic("16bit mode is not implemented")
}
switch m.opecode {
case 0:
testRm32Imm32(e, m)
case 3:
negRm32(e, m)
case 6:
divRm32(e, m)
default:
panic(fmt.Sprintf("eip=%x opecode = %d\n", e.eip, m.opecode) + "not implemented")
}
}
func (e *Emulator) code0f() {
lgdt := func() {
m := e.parseModRM()
address := e.calcMemoryAddress32(m) // 32bit mode
if e.genuineProtectedEnable == false && e.operandSizeOverride == false ||
e.genuineProtectedEnable == true && e.operandSizeOverride == true {
address = uint32(e.calcMemoryAddress16(m)) // 16bit mode
}
if m.opecode == 2 {
// LGDT
e.gdtrSize = e.getMemory16(address)
e.gdtrBase = e.v2p(e.getMemory32(address + 2))
printf("lgdt: address=0x%x gdtSize=0x%x gdtBase=0x%x @emu\n",
address, e.gdtrSize, e.gdtrBase)
e.dumpGDTEntry(e.gdtrBase)
e.dumpGDTEntry(e.gdtrBase + 0x8)
e.dumpGDTEntry(e.gdtrBase + 0x10)
e.dumpGDTEntry(e.gdtrBase + 0x18)
e.dumpGDTEntry(e.gdtrBase + 0x20)
e.dumpGDTEntry(e.gdtrBase + 0x28)
} else if m.opecode == 3 {
// LIDT
e.idtrSize = e.getMemory16(address)
e.idtrBase = e.v2p(e.getMemory32(address + 2))
printf("lidt: address=0x%x idtSize=0x%x idtBase=0x%x @emu\n",
address, e.idtrSize, e.idtrBase)
e.dumpIDTEntry(e.idtrBase + 0x8 * 32) // IDT Entry for Timer
} else {
printf("Invalid Operation: 0x0f 0x01 but invalid opecode\n")
}
}
ltrRm16 := func() {
m := e.parseModRM()
e.tr.gdtOffset = e.getRm16(m)
// Read GDT
// entry := e.getMemory64(e.gdtrBase + uint32(e.tr.gdtOffset))
var entry uint64
for i := uint32(0); i < 8; i++ {
entry |= uint64(e.memory[e.gdtrBase+uint32(e.tr.gdtOffset)+i]) << uint32(i*8)
}
e.tr.TSSBase = uint32((((entry >> 56) & 0xFF) << 24) | (((entry >> 32) & 0xFF) << 16) | ((entry >> 16) & 0xFFFF))
e.tr.TSSLimit = uint32((((entry >> 48) & 0xF) << 16) | (entry & 0xFFFF))
e.taskState.ss0 = uint16(e.memory[e.tr.TSSBase+9])<<8 | uint16(e.memory[e.tr.TSSBase+8])
e.taskState.esp0 = uint32(e.memory[e.tr.TSSBase+7])<<24 | uint32(e.memory[e.tr.TSSBase+6])<<16 | uint32(e.memory[e.tr.TSSBase+5])<<8 | uint32(e.memory[e.tr.TSSBase+4])
printf("ltrRm16: gdtEntryPhysAddr=0x%x tssBase=0x%x tssLimit=0x%x ss0=0x%x esp0=0x%x @emu\n",
e.gdtrBase+uint32(e.tr.gdtOffset), e.tr.TSSBase, e.tr.TSSLimit, e.taskState.ss0, e.taskState.esp0)
}
movR32Cr := func() {
m := e.parseModRM()
// e.setR32(m, e.cr[m.opecode])
e.setRm32(m, e.cr[m.opecode])
}
movCrR32 := func() {
m := e.parseModRM()
// e.cr[m.opecode] = e.getR32(m)
e.cr[m.opecode] = e.getRm32(m)
// printf("%d %d\n", m.opecode, e.cr[m.opecode])
// if m.opecode == 4 && e.cr[m.opecode]&CR4PageSizeExtension != 0 {
if m.opecode == 3 {
if e.cr[4]&CR4PageSizeExtension != 0 {
printf("CR4 page size sxtension Enabled (Page size is 4MB).\n")
e.PageSizeExtensionEable = true
} else {
printf("CR4 page size sxtension Disabled (Page size is 4KB).\n")
e.PageSizeExtensionEable = false
}
e.cr[4] &^= CR4PageSizeExtension
printf("CR3 Page Directory Table is at 0x%08x\n", e.cr[m.opecode]>>12)
printf("Page Directory Table[%d] = 0x%08x\n",
0, e.getMemory32((e.cr[m.opecode]>>22)+4*0))
printf("Page Directory Table[%d] = 0x%08x\n",
512, e.getMemory32((e.cr[m.opecode]>>22)+4*512))
printf("Page Directory Table[%d] = 0x%08x\n",
513, e.getMemory32((e.cr[m.opecode]>>22)+4*513))
} else if m.opecode == 0 && e.cr[m.opecode]&CR0PagingFlag != 0 {
printf("CR0 paging is Enabled.\n")
}
}
MovzxR32Rm8 := func() {
m := e.parseModRM()
// e.setRegister32(m.opecode, uint32(e.getMemory8(e.calcMemoryAddress32(m))))
e.setRegister32(m.opecode, uint32(e.getRm8(m)))
}
cmoveR32Rm32 := func() {
m := e.parseModRM()
rm32 := e.getRm32(m)
if e.eflags.isEnable(ZeroFlag) {
e.setR32(m, rm32)
}
}
MovzxR32Rm16 := func() {
m := e.parseModRM()
// printf("m.disp32=0x%x\n", m.disp32)
// e.setRegister32(m.opecode, uint32(e.getMemory16(m.disp32)))
e.setRegister32(m.opecode, uint32(e.getRm16(m)))
}
MovsxR32Rm8 := func() {
m := e.parseModRM()
value := uint32(e.getRm8(m))
if value&0x80 != 0 {
value |= 0xFFFFFF00
}
e.setRegister32(m.opecode, value)
}
seteRm8 := func() {
m := e.parseModRM()
if e.eflags.isEnable(ZeroFlag) {
e.setRm8(m, 1)
} else {
e.setRm8(m, 0)
}
}
MovsxR32Rm16 := func() {
m := e.parseModRM()
// printf("m.disp32=0x%x\n", m.disp32)
value := uint32(e.getMemory16(m.disp32))
if value&0x8000 != 0 {
value |= 0xFFFF0000
}
e.setRegister32(m.opecode, value)
}
// panic: EIP=0x80107eff 0x0F 0x82 is not implemented
jb := func() {
// printf("jb @emu")
rel := e.getCode32(0)
e.eip += 4
if e.eflags.isEnable(CarryFlag) {
e.eip += rel
}
}
jne := func() {
rel := e.getCode32(0)
e.eip += 4
if !e.eflags.isEnable(ZeroFlag) {
e.eip += rel
}
}
je := func() {
rel := e.getCode32(0)
e.eip += 4
if e.eflags.isEnable(ZeroFlag) {
e.eip += rel
}
}
jg := func() {
rel := e.getCode32(0)
e.eip += 4
if !e.eflags.isEnable(ZeroFlag) && e.eflags.isEnable(SignFlag) == e.eflags.isEnable(OverflowFlag) {
e.eip += rel
}
}
jae := func() {
rel := e.getCode32(0)
e.eip += 4
if !e.eflags.isEnable(CarryFlag) {
e.eip += rel
}
}
ja := func() {
rel := e.getCode32(0)
e.eip += 4
if !e.eflags.isEnable(ZeroFlag) && !e.eflags.isEnable(CarryFlag) {
e.eip += rel
}
}
second := e.getCode8(1)
e.eip += 2
if second == 0x00 {
ltrRm16()
} else if second == 0x01 {
lgdt()
} else if second == 0x20 {
movR32Cr()
} else if second == 0x22 {
movCrR32()
} else if second == 0x44 {
cmoveR32Rm32()
} else if second == 0x82 {
jb()
} else if second == 0x83 {
jae()
} else if second == 0x84 {
je()
} else if second == 0x85 {
jne()
} else if second == 0x87 {
ja()
} else if second == 0x8f {
jg()
} else if second == 0xB6 {
MovzxR32Rm8()
} else if second == 0xB7 {
MovzxR32Rm16()
} else if second == 0xBe {
MovsxR32Rm8()
} else if second == 0xBf {
MovsxR32Rm16()
} else if second == 0x94 {
seteRm8()
} else {
panic(fmt.Sprintf("EIP=0x%x 0x0F 0x%x is not implemented\n", e.eip-1, second))
}
}
func (e *Emulator) intImm8() {
value := e.getCode8(1)
if value == 0x10 && e.getRegister16(AX) == 0x13 {
// TODO: change video mode, 16color, 80x25
} else if value == 0x10 && e.getRegister8(AH) == 0x0e {
charCode := e.getRegister8(AL)
fmt.Fprintf(e.writer, "%c", charCode)
} else {
panic(fmt.Sprintf("int not implemented"))
}
e.eip += 2
}
func (e *Emulator) outAlImm8() {
address := uint16(e.getCode8(1))
value := e.getRegister8(AL)
e.io.out8(address, value)
e.eip += 2
}
func (e *Emulator) inAlImm8() {
address := uint16(e.getCode8(1))
value := e.io.in8(address)
e.setRegister8(AL, value)
e.eip += 2
}
func (e *Emulator) inAxImm8() {
panic(fmt.Sprintf("inAxImm8 not implemented"))
}
func (e *Emulator) inEaxImm8() {
panic(fmt.Sprintf("inEaxImm8 not implemented"))
}
func (e *Emulator) movR16Imm16() {
reg := e.getCode8(0) - 0xB8
value := e.getCode16(1)
e.setRegister16(reg, value)
e.eip += 3
}
func (e *Emulator) movR32Imm32() {
reg := e.getCode8(0) - 0xB8
value := e.getCode32(1)
e.registers[reg] = value
e.eip += 5
}
func (e *Emulator) movEaxMoffs32() {
value := e.getMemory32(e.getCode32(1))
// printf("value=0x%x\n", value)
e.setRegister32(EAX, value)
e.eip += 5
}
func (e *Emulator) movMoffs32Eax() {
value := e.getRegister32(EAX)
// printf("value=0x%x\n", value)
// e.setRegister32(EAX, value)
e.setMemory32(e.getCode32(1), value)
e.eip += 5
}
func (e *Emulator) movRm8Imm8() {
e.eip++
m := e.parseModRM()
value := e.getCode8(0)
e.eip ++
e.setRm8(m, value)
}
func (e *Emulator) movRm32Imm32() {
e.eip++
m := e.parseModRM()
value := e.getCode32(0)
e.eip += 4
e.setRm32(m, value)
}
func (e *Emulator) orEaxImm32() {
value := e.getCode32(1) | e.getRegister32(EAX)
e.setRegister32(EAX, value)
e.eip += 5
}
func (e *Emulator) addEaxImm32() {
value := e.getCode32(1) + e.getRegister32(EAX)
e.setRegister32(EAX, value)
e.eip += 5
}
func (e *Emulator) subEaxImm32() {
value := e.getCode32(1) - e.getRegister32(EAX)
e.setRegister32(EAX, value)
e.eip += 5
}
func (e *Emulator) code81() {
addRm32Imm32 := func(e *Emulator, m ModRM) {
rm32 := e.getRm32(m)
imm32 := e.getCode32(0)
e.eip += 4
result := uint64(rm32) + uint64(imm32)
e.setRm32(m, uint32(result))
}
andRm32Imm32 := func(e *Emulator, m ModRM) {
rm32 := e.getRm32(m)
imm32 := e.getCode32(0)
e.eip += 4
// printf("rm32 value=0x%x imm32 value=0x%x\n", rm32, imm32)
result := uint64(rm32) & uint64(imm32)
e.setRm32(m, uint32(result))
}
orRm32Imm32 := func(e *Emulator, m ModRM) {
rm32 := e.getRm32(m)
imm32 := e.getCode32(0)
e.eip += 4
// printf("rm32 value=0x%x imm32 value=0x%x\n", rm32, imm32)
result := uint64(rm32) | uint64(imm32)
e.setRm32(m, uint32(result))
}
cmpRm32Imm32 := func(e *Emulator, m ModRM) {
rm32 := e.getRm32(m)
imm32 := e.getCode32(0)
// printf("cmpRm32Imm32: eip=%x rm32 value=0x%x imm32 value=0x%x @emu\n", e.eip, rm32, imm32)
e.eip += 4
result := uint64(rm32) - uint64(imm32)
e.eflags.updateBySub(rm32, imm32, result)
// e.setRm32(m, uint32(result))
}
e.eip++
m := e.parseModRM()
if e.genuineProtectedEnable == false && e.operandSizeOverride == false ||
e.genuineProtectedEnable == true && e.operandSizeOverride == true {
panic("16bit mode is not implemented")
}
switch m.opecode {
case 0:
addRm32Imm32(e, m)
case 1:
orRm32Imm32(e, m)
case 4:
andRm32Imm32(e, m)
case 7:
cmpRm32Imm32(e, m)
default:
panic(fmt.Sprintf("EIP=0x%x code=81 opecode=%d ", e.eip, m.opecode) + "not implemented")
}
}
func (e *Emulator) code80() {
// cmpRm32Imm8 := func(e *Emulator, m ModRM) {
// rm32 := e.getRm32(m)
// imm8 := uint32(e.getSignCode8(0))
// e.eip++
// result := uint64(rm32) - uint64(imm8)
// e.eflags.updateBySub(rm32, imm8, result)
// }
orRm8Imm8 := func(e *Emulator, m ModRM) {
rm8 := e.getRm8(m)
imm8 := e.getCode8(0)
e.eip++
e.setRm8(m, rm8|imm8)
e.eflags.updateByAndOr8(rm8 | imm8)
}
andRm8Imm8 := func(e *Emulator, m ModRM) {
rm8 := e.getRm8(m)
imm8 := e.getCode8(0)
e.eip++
e.setRm8(m, rm8&imm8)
e.eflags.updateByAndOr8(rm8 & imm8)
}
cmpRm8Imm8 := func(e *Emulator, m ModRM) {
imm8 := e.getCode8(0)
rm8 := e.getRm8(m)
e.eip++
result := uint16(rm8) - uint16(imm8)
e.eflags.updateBySub8(rm8, imm8, result)
}
e.eip++
m := e.parseModRM()
if e.genuineProtectedEnable == false && e.operandSizeOverride == false ||