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virtual_asm_x64.cpp
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virtual_asm_x64.cpp
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#include "virtual_asm.h"
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stack>
#include <stdio.h>
#include <unordered_set>
//See http://ref.x86asm.net/coder32.html for a list of x86 opcode bytes
namespace assembler {
enum OpExtension : byte {
EX_0 = 0,
EX_1 = 1,
EX_2 = 2,
EX_3 = 3,
EX_4 = 4,
EX_5 = 5,
EX_6 = 6,
EX_7 = 7,
};
enum ModBits : byte {
ADR = 0,
ADR8 = 1,
ADR32 = 2,
REG = 3
};
enum IndexScale : byte {
Scale1 = 0,
Scale2 = 1,
Scale4 = 2,
Scale8 = 3
};
unsigned char mod_rm(unsigned char Reg, unsigned char Mod, unsigned char RM) {
return (Mod<<6) | (Reg<<3) | RM;
}
unsigned char sib(unsigned char ScaledIndex, unsigned char Mode, unsigned char BaseReg) {
return (Mode<<6) | (ScaledIndex<<3) | BaseReg;
}
struct Argument {
Register* reg;
MemAddress* mem;
uint64_t constant;
bool is32;
Argument(Register* r) : reg(r), mem(0) {}
Argument(MemAddress* m) : reg(0), mem(m) {}
Argument(unsigned Constant32) : reg(0), mem(0), constant(Constant32), is32(true) {}
Argument(uint64_t Constant) : reg(0), mem(0), constant(Constant), is32(false) {}
};
void moveToUpperDWORD(MemAddress& address) {
if(address.absolute_address == 0)
address.offset += 4;
else
address.absolute_address = (byte*)address.absolute_address + 4;
}
AddrPrefix MemAddress::prefix(unsigned char further, bool defLong) {
return AddrPrefix(*this, defLong, further);
}
template<>
MemAddress as<float>(MemAddress addr) {
addr.bitMode = sizeof(float) * 8;
addr.Signed = true;
addr.Float = true;
return addr;
}
template<>
MemAddress as<double>(MemAddress addr) {
addr.bitMode = sizeof(double) * 8;
addr.Signed = true;
addr.Float = true;
return addr;
}
unsigned Processor::pushSize() {
return sizeof(void*);
}
void Processor::call_cdecl_prep(unsigned argBytes) {
unsigned stackOffset = (stackDepth + argBytes) % 16;
Register esp(*this, ESP, sizeof(void*) * 8);
if(stackOffset != 0)
esp -= 16 - stackOffset;
}
void Processor::call_cdecl_end(unsigned argBytes, bool returnPointer) {
Register esp(*this, ESP, sizeof(void*) * 8);
unsigned stackOffset = (stackDepth + argBytes) % 16;
if(stackOffset != 0)
argBytes += (16 - stackOffset);
#ifndef _MSC_VER
if(returnPointer)
argBytes -= 4;
#endif
if(argBytes != 0)
esp += argBytes;
}
unsigned Processor::call_cdecl_args(const char* args, va_list ap) {
return call_thiscall_args(0, args, ap);
}
unsigned Processor::call_thiscall_args(Register* obj, const char* args, va_list ap) {
std::stack<Argument> arg_stack;
std::unordered_set<unsigned char> used_regs;
Register esp(*this, ESP, sizeof(void*) * 8);
unsigned argCount = 0, floatCount = 0, intCount = 0, regCount = 0, stackBytes = 0;
//Set the object as first argument
if(obj) {
if(!isIntArg64Register(intCount, argCount))
stackBytes += pushSize();
++argCount;
++intCount;
arg_stack.push(obj);
}
//Read the arguments in...
while(args && *args != '\0') {
if(*args == 'r') {
Register* reg = va_arg(ap,Register*);
if(reg->xmm()) {
if(!isFloatArg64Register(floatCount, argCount))
stackBytes += pushSize();
++floatCount;
}
else {
if(!isIntArg64Register(intCount, argCount))
stackBytes += pushSize();
++intCount;
}
++regCount;
arg_stack.push(reg);
}
else if(*args == 'm') {
MemAddress* adr = va_arg(ap,MemAddress*);
if(adr->Float) {
if(!isFloatArg64Register(floatCount, argCount))
stackBytes += pushSize();
++floatCount;
}
else {
if(!isIntArg64Register(intCount, argCount))
stackBytes += pushSize();
++intCount;
}
arg_stack.push(adr);
}
else if(*args == 'p') {
if(!isIntArg64Register(intCount, argCount))
stackBytes += pushSize();
arg_stack.push(va_arg(ap,uint64_t));
++intCount;
}
else if(*args == 'c') {
if(!isIntArg64Register(intCount, argCount))
stackBytes += pushSize();
arg_stack.push(va_arg(ap,unsigned));
++intCount;
}
else
throw 0;
++argCount;
++args;
}
#ifdef _MSC_VER
if(stackBytes < 32)
stackBytes = 32;
#endif
call_cdecl_prep(stackBytes);
unsigned intA = intCount - 1, floatA = floatCount - 1, a = argCount - 1;
//Then push them in reverse order
while(!arg_stack.empty()) {
auto& arg = arg_stack.top();
if(arg.reg) {
Register reg = *arg.reg;
if(reg.code == ESP || reg.code == R15)
throw "Cannot use this register for cdecl call wrapper.";
if(reg.xmm()) {
if(isFloatArg64Register(floatA, a)) {
Register other = floatArg64(floatA, a);
other.bitMode = reg.bitMode;
if(other.code != reg.code) {
if(used_regs.find(reg.code) != used_regs.end())
throw "Invalid out-of-order use of argument register.";
other = reg;
}
used_regs.insert(other.code);
}
else {
if(used_regs.find(reg.code) != used_regs.end())
throw "Invalid out-of-order use of argument register.";
esp -= pushSize();
MemAddress adr = *esp;
adr.bitMode = reg.bitMode;
adr = reg;
}
--floatA;
}
else {
if(isIntArg64Register(intA, a)) {
Register other = intArg64(intA, a);
other.bitMode = reg.bitMode;
if(other.code != reg.code) {
if(used_regs.find(reg.code) != used_regs.end())
throw "Invalid out-of-order use of argument register.";
other = reg;
}
used_regs.insert(other.code);
}
else {
if(used_regs.find(reg.code) != used_regs.end())
throw "Invalid out-of-order use of argument register.";
push(reg);
}
--intA;
}
}
else if(arg.mem) {
MemAddress addr = *arg.mem;
if(argCount > 1) {
for(unsigned i = 0; i < maxIntArgs64(); ++i) {
if(addr.code == intArg64(i, i).code)
throw "Cannot use this register for cdecl call wrapper address.";
if(addr.other == intArg64(i, i).code)
throw "Cannot use this register for cdecl call wrapper address.";
if(addr.scaleFactor != 0 && addr.scaleReg == intArg64(i, i).code)
throw "Cannot use this register for cdecl call wrapper address.";
}
}
if(addr.code == R15 || addr.other == R15 || (addr.scaleFactor != 0 && addr.scaleReg == R15))
throw "Cannot use this register for cdecl call wrapper address.";
if(addr.other == ESP)
throw "Cannot use this register for cdecl call wrapper address.";
if(addr.code == ESP) {
addr.code = R15;
addr.offset += pushSize();
}
if(addr.Float) {
if(isFloatArg64Register(floatA, a)) {
Register reg = floatArg64(floatA, a);
reg.bitMode = addr.bitMode;
reg = addr;
}
else {
push(addr);
}
--floatA;
}
else {
if(isIntArg64Register(intA, a)) {
Register reg = intArg64(intA, a);
reg.bitMode = addr.bitMode;
reg = addr;
}
else {
push(addr);
}
--intA;
}
}
else {
if(isIntArg64Register(intA, a)) {
Register reg = intArg64(intA, a);
if(arg.is32)
reg.bitMode = 32;
else
reg.bitMode = 64;
reg = arg.constant;
}
else {
push(arg.constant);
}
--intA;
}
arg_stack.pop();
--a;
}
#ifdef _MSC_VER
esp -= 32;
#endif
return stackBytes;
}
void Processor::call_cdecl(void* func, const char* args, va_list ap) {
unsigned stackBytes = call_cdecl_args(args, ap);
call(func);
call_cdecl_end(stackBytes);
}
unsigned Processor::call_cdecl_args(const char* args, ...) {
va_list ap;
va_start(ap, args);
unsigned r = call_cdecl_args(args, ap);
va_end(ap);
return r;
}
void Processor::call_cdecl(void* func, const char* args, ...) {
va_list ap;
va_start(ap, args);
call_cdecl(func, args, ap);
va_end(ap);
}
unsigned Processor::call_thiscall_args(Register* obj, const char* args, ...) {
va_list ap;
va_start(ap, args);
unsigned r = call_thiscall_args(obj, args, ap);
va_end(ap);
return r;
}
void Processor::call_stdcall(void* func, const char* args, ...) {
va_list ap;
va_start(ap, args);
call_cdecl(func, args, ap);
va_end(ap);
}
Processor::Processor(CodePage& codePage, unsigned defaultBitMode ) {
op = codePage.getActivePage();
pageStart = op;
bitMode = defaultBitMode;
lastBitMode = bitMode;
stackDepth = pushSize();
jumpSpace = 0;
}
void Processor::migrate(CodePage& prevPage, CodePage& newPage) {
jump(Jump,newPage.getActivePage());
jumpPtr = op;
op += jumpSpace;
prevPage.markUsedAddress((void*)op);
op = newPage.getActivePage();
pageStart = op;
jumpSpace = 0;
}
template<>
Processor& Processor::operator<<(MemAddress addr) {
if(addr.absolute_address != 0) {
if((size_t)addr.absolute_address <= INT_MAX) {
//Normal 32 bit address needs a none sib byte
return *this << mod_rm(addr.other % 8, ADR, SIB) << sib(0x4, 0, ADDR) << (int)(size_t)addr.absolute_address;
}
else {
//Take 64 bit absolute address from R11
return *this << mod_rm(addr.other % 8, ADR, R11 % 8);
}
}
if(addr.scaleFactor != 0) {
IndexScale scale;
switch(addr.scaleFactor) {
case 1:
scale = Scale1; break;
case 2:
scale = Scale2; break;
case 4:
scale = Scale4; break;
case 8:
scale = Scale8; break;
default: throw 0;
}
//Can't scale with an offset from ESP
if(addr.scaleReg % 8 == ESP)
throw 0;
//EBP/R13 doesn't have an ADR mode, so use ADR8 and append a 0
if(addr.offset == 0 && addr.code % 8 != EBP)
return *this << mod_rm(addr.other % 8, ADR, SIB) << sib(addr.scaleReg % 8, scale, addr.code % 8);
else if(addr.offset >= CHAR_MIN && addr.offset <= CHAR_MAX)
return *this << mod_rm(addr.other % 8, ADR8, SIB) << sib(addr.scaleReg % 8, scale, addr.code % 8) << (char)addr.offset;
else
return *this << mod_rm(addr.other % 8, ADR32, SIB) << sib(addr.scaleReg % 8, scale, addr.code % 8) << addr.offset;
}
if(addr.offset == 0 && addr.code % 8 != EBP) { //[EBP] means absolute address, so we use [EBP+0] instead
*this << mod_rm(addr.other % 8, ADR, addr.code % 8);
if(addr.code % 8 == ESP)
*this << '\x24'; //SIB byte indicating [ESP]
}
else if(addr.offset >= CHAR_MIN && addr.offset <= CHAR_MAX) {
*this << mod_rm(addr.other % 8, ADR8, addr.code % 8);
if(addr.code % 8 == ESP)
*this << '\x24'; //SIB byte indicating [ESP]
*this << (char)addr.offset;
}
else {
*this << mod_rm(addr.other % 8, ADR32, addr.code % 8);
if(addr.code % 8 == ESP)
*this << '\x24'; //SIB byte indicating [ESP]
*this << addr.offset;
}
return *this;
}
template<>
Processor& Processor::operator<<(AddrPrefix pr) {
MemAddress& adr = pr.adr;
//64 bit absolute addresses need to mangle a register in order to work
if((size_t)adr.absolute_address > (size_t)INT_MAX) {
*this << '\x49' << '\xBB' << (uint64_t)adr.absolute_address;
adr.code = R11;
}
//Further prefixes that need to be before the REX byte
if(pr.further != 0)
*this << pr.further;
//64 bit prefix
unsigned char ch = '\x40';
if(!pr.defLong) {
if(adr.bitMode == 64)
ch |= '\x08';
}
if((adr.code % 16) > 7)
ch |= '\x01';
if((adr.other % 16) > 7)
ch |= '\x04';
if(adr.scaleReg > 7)
ch |= '\x02';
if(ch != '\x40')
*this << ch;
return *this;
}
template<>
Processor& Processor::operator<<(RegPrefix pr) {
Register& reg = pr.reg;
unsigned short other = pr.other;
unsigned char ch = '\x40';
if(!pr.defLong) {
if(reg.getBitMode() == 64)
ch |= '\x08';
}
if((reg.code % 16) > 7)
ch |= '\x01';
if((other % 16) > 7)
ch |= '\x04';
if(ch != '\x40')
*this << ch;
return *this;
}
void Processor::push(Register& reg) {
*this << reg.prefix(EX_0, true) << byte(0x50u+(reg.code % 8));
}
void Processor::pop(Register& reg) {
*this << reg.prefix(EX_0, true) << byte(0x58u+(reg.code % 8));
}
void Processor::push(MemAddress address) {
address.other = EX_6;
*this << address.prefix() << '\xFF' << address;
}
void Processor::pop(MemAddress address) {
address.other = EX_0;
*this << address.prefix() << '\x8F' << address;
}
void Processor::push(size_t value) {
if(value <= CHAR_MAX)
*this << '\x6A' << (byte)value;
else
*this << '\x48' << '\x68' << (long long)value;
}
void Processor::pop(unsigned int count) {
Register esp(*this, ESP);
esp += count * pushSize();
}
void Processor::call(Register& reg) {
*this << reg.prefix() << '\xFF' << reg.modrm(EX_2);
}
void Processor::call(void* func) {
int64_t offset = ((byte*)func - op) - 5;
if(offset < (int64_t)INT_MIN || offset > (int64_t)INT_MAX) {
uint64_t abs = (uint64_t)func;
if(abs > (uint64_t)UINT_MAX)
*this << '\x49' << '\xBB' << abs;
else //0-extend small actual addresses
*this << '\x41' << '\xBB' << (unsigned)abs;
*this << '\x49' << '\xFF' << mod_rm(EX_2,REG,R11 % 8);
}
else {
*this << '\xE8' << (int)offset;
}
}
unsigned char shortJumpCodes[JumpTypeCount] = { 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F, 0xEB};
unsigned char longJumpCodes[JumpTypeCount] = { 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0xE9 };
void* Processor::prep_short_jump(JumpType type) {
*this << shortJumpCodes[type];
void* ret = (void*)op;
*this << (char)0;
return ret;
}
void Processor::end_short_jump(void* p) {
volatile byte* jumpFrom = (volatile byte*)p;
int64_t offset = ((size_t)op - (size_t)jumpFrom) - 1;
if(offset < CHAR_MIN || offset > CHAR_MAX)
throw "Short jump too long.";
*jumpFrom = (char)offset;
}
void* Processor::prep_long_jump(JumpType type) {
if(type != Jump)
*this << '\x0F';
*this << longJumpCodes[type];
void* ret = (void*)op;
*this << (int)0;
jumpSpace += 16;
return ret;
}
void Processor::end_long_jump(void* p) {
volatile byte* jumpFrom = (volatile byte*)p;
bool isSamePage = (size_t)jumpFrom >= (size_t)pageStart && (size_t)jumpFrom < (size_t)op;
int64_t offset = ((size_t)op - (size_t)jumpFrom) - 4;
if(offset < (int64_t)INT_MIN || offset > (int64_t)INT_MAX) {
if(isSamePage)
throw "Inside-page long jump too long. This should never ever happen, somebody screwed the pooch.";
Register reg(*this, R11, sizeof(void*));
auto* prevOp = op;
op = jumpPtr;
reg = (void*)prevOp;
*this << reg.prefix(EX_4) << '\xFF' << reg.modrm(EX_4);
offset = ((size_t)jumpPtr - (size_t)jumpFrom) - 4;
if(offset < (int64_t)INT_MIN || offset > (int64_t)INT_MAX)
throw "Multi-page drifting! Can't recover from this.";
*(volatile int*)jumpFrom = (int)offset;
jumpPtr = op;
op = prevOp;
return;
}
*(volatile int*)jumpFrom = (int)offset;
if(isSamePage)
jumpSpace -= 16;
}
void Processor::jump(JumpType type, volatile byte* dest) {
int64_t offset = ((size_t)dest - (size_t)op) - 2;
if(offset >= CHAR_MIN && offset <= CHAR_MAX)
*this << shortJumpCodes[type] << (char)offset;
else if (offset > INT_MAX || offset < INT_MIN) {
Register reg(*this, R11, sizeof(void*));
reg = (void*)dest;
jump(reg);
}
else if(type == Jump)
*this << longJumpCodes[Jump] << (int)(offset-3); //Long jump is 3 bytes larger, jump is from the end of the full opcode
else
*this << '\x0F' << longJumpCodes[type] << (int)(offset-4); //Conditional long jump is 4 bytes larger, jump is from the end of the full opcode
}
void Processor::jump(Register& reg) {
*this << reg.prefix(EX_4) << '\xFF' << reg.modrm(EX_4);
}
void Processor::loop(volatile byte* dest, JumpType type) {
int64_t off = dest - op - 2;
if(off < CHAR_MIN || off > CHAR_MAX)
throw "Loop offset too far.";
if(type == Jump)
*this << '\xE2' << (char)off;
else if(type == Zero)
*this << '\xE1' << (char)off;
else if(type == NotZero)
*this << '\xE0' << (char)off;
else
throw "Unsupported loop type.";
}
void Processor::string_copy(unsigned size) {
if(size == 1)
*this << '\xA4';
else if(size == 2)
*this << '\x66' << '\xA5';
else if(size == 4)
*this << '\xA5';
else if(size == 8)
*this << '\x48' << '\xA5';
else
throw "Invalid string copy step size.";
}
void Processor::setDirFlag(bool forward) {
if(forward)
*this << '\xFC';
else
*this << '\xFD';
}
void Processor::ret() {
*this << '\xC3';
}
void Processor::debug_interrupt() {
*this << '\xCC';
}
MemAddress::MemAddress(Processor& CPU, void* address)
: cpu(CPU), code(ESP), absolute_address(address), other(NONE),
offset(0), bitMode(cpu.bitMode), Float(false), Signed(false), scaleFactor(0), scaleReg(NONE) {}
MemAddress::MemAddress(Processor& CPU, RegCode Code)
: cpu(CPU), code(Code), absolute_address(0), other(NONE),
offset(0), bitMode(cpu.bitMode), Float(false), Signed(false), scaleFactor(0), scaleReg(NONE) {}
MemAddress::MemAddress(Processor& CPU, RegCode Code, int Offset)
: cpu(CPU), code(Code), absolute_address(0), other(NONE),
offset(Offset), bitMode(cpu.bitMode), Float(false), Signed(false), scaleFactor(0), scaleReg(NONE) {}
MemAddress MemAddress::operator+(ScaledIndex scale) {
scaleReg = scale.reg;
scaleFactor = scale.scaleFactor;
return *this;
}
MemAddress MemAddress::operator+(int Offset) {
offset += Offset;
return *this;
}
MemAddress MemAddress::operator-(int Offset) {
offset -= Offset;
return *this;
}
void MemAddress::operator++() {
switch(bitMode) {
case 8:
cpu << prefix() << '\xFE' << *this; break;
case 16:
cpu << prefix('\x66') << '\xFF' << *this; break;
default:
cpu << prefix() << '\xFF' << *this; break;
}
}
void MemAddress::operator--() {
other = EX_1;
switch(bitMode) {
case 8:
cpu << prefix() << '\xFE' << *this; break;
case 16:
cpu << prefix('\x66') << '\xFF' << *this; break;
default:
cpu << prefix() << '\xFF' << *this; break;
}
}
void MemAddress::operator-() {
other = EX_3;
switch(bitMode) {
case 8:
cpu << prefix() << '\xF6' << *this; break;
case 16:
cpu << prefix('\x66') << '\xF7' << *this; break;
default:
cpu << prefix() << '\xF7' << *this; break;
}
}
void MemAddress::operator~() {
other = EX_2;
switch(bitMode) {
case 8:
cpu << prefix() << '\xF6' << *this; break;
case 16:
cpu << prefix('\x66') << '\xF7' << *this; break;
default:
cpu << prefix() << '\xF7' << *this; break;
}
}
void MemAddress::operator+=(unsigned int amount) {
if(amount == 0) return;
if(code == EAX)
cpu << '\x05' << amount;
else if(amount <= CHAR_MAX)
cpu << prefix() << '\x83' << *this << (byte)amount;
else
cpu << prefix() << '\x81' << *this << amount;
}
void MemAddress::operator-=(unsigned int amount) {
if(amount == 0) return;
other = (RegCode)EX_5;
if(code == EAX)
cpu << '\x2D' << amount;
else if(amount <= CHAR_MAX)
cpu << prefix() << '\x83' << *this << (byte)amount;
else
cpu << prefix() << '\x81' << *this << amount;
}
void MemAddress::operator=(unsigned int value) {
switch(bitMode) {
case 8:
cpu << prefix() << '\xC6' << *this << (byte)value; break;
case 16:
cpu << prefix('\x66') << '\xC7' << *this << (unsigned short)value; break;
case 32:
default:
cpu << prefix() << '\xC7' << *this << value; break;
}
}
void MemAddress::operator&=(unsigned int value) {
other = EX_4;
cpu << prefix() << '\x81' << *this << value;
}
void MemAddress::operator|=(unsigned int value) {
other = EX_7;
switch(bitMode) {
case 8:
cpu << prefix() << '\x80' << *this << (byte)value; break;
case 16:
cpu << prefix('\x66') << '\x81' << *this << (unsigned short)value; break;
case 32:
case 64:
cpu << prefix() << '\x81' << *this << value; break;
}
}
void MemAddress::operator=(void* value) {
bitMode = 64;
if((size_t)value < (size_t)INT_MAX) {
cpu << prefix() << '\xC7' << *this << (unsigned)(size_t)value;
}
else {
if((size_t)absolute_address > UINT_MAX - sizeof(void*) * 8) {
bitMode = 32;
unsigned* values = (unsigned*)&value;
cpu << prefix() << '\xC7' << *this << values[0];
moveToUpperDWORD(*this);
cpu << prefix() << '\xC7' << *this << values[1];
}
else {
other = R11;
cpu << '\x49' << '\xBB' << (uint64_t)value;
cpu << prefix() << '\x89' << *this;
}
}
}
void MemAddress::operator=(Register fromReg) {
other = fromReg.code;
if(fromReg.xmm()) {
switch(bitMode) {
case 32:
cpu << prefix('\xF3') << '\x0F' << '\x11' << *this;
break;
case 64:
cpu << prefix('\xF2', true) << '\x0F' << '\x11' << *this;
break;
default:
throw "Unsupported bitmode for xmm register";
}
}
else {
switch(bitMode) {
case 8:
cpu << prefix() << '\x88' << *this; break;
case 16:
cpu << prefix('\x66') << '\x89' << *this; break;
default:
cpu << prefix() << '\x89' << *this; break;
}
}
}
void MemAddress::direct_copy(MemAddress address, Register& intermediate) {
if(bitMode != address.bitMode)
throw 0;
other = intermediate.code; address.other = other;
switch(bitMode) {
case 8:
case 16:
case 32:
address.bitMode = 32;
intermediate = address;
*this = intermediate;
break;
case 64:
address.bitMode = 64;
intermediate = address;
*this = intermediate;
break;
}
}
Register::Register(Processor& CPU, RegCode Code) : cpu(CPU), code(Code), bitMode(0) {}
Register::Register(Processor& CPU, RegCode Code, unsigned BitModeOverride)
: cpu(CPU), code(Code), bitMode(BitModeOverride) {
}
bool Register::xmm() {
return code >= 16;
}
bool Register::extended() {
return (code % 16) >= 8;
}
RegCode Register::index() {
return (RegCode)(code % 8);
}
RegPrefix Register::prefix(unsigned short other, bool defLong) {
return RegPrefix(*this, other, defLong);
}
RegPrefix Register::prefix(Register& other, bool defLong) {
return RegPrefix(*this, other.code, defLong);
}
unsigned char Register::modrm(unsigned short other) {
return mod_rm(other % 8, REG, code % 8);
}
unsigned char Register::modrm(Register& other) {
return mod_rm(other.code % 8, REG, code % 8);
}
unsigned Register::getBitMode() const {
if(bitMode)
return bitMode;
else
return cpu.bitMode;
}
unsigned Register::getBitMode(const MemAddress& addr) const {
if(bitMode == 0)
return addr.bitMode;
else
return bitMode;
}
MemAddress Register::operator*() const {
return MemAddress(cpu,code);
}
ScaledIndex Register::operator*(unsigned char scale) const {
return ScaledIndex(code, scale);
}
void Register::swap(MemAddress address) {
address.other = code;
switch(getBitMode(address)) {
case 8:
cpu << address.prefix() << '\x86' << address; break;
case 16:
cpu << address.prefix('\x66') << '\x87' << address; break;
case 32:
case 64:
cpu << address.prefix() << '\x87' << address; break;
}
}
void Register::swap(Register& other) {
if(code == other.code)
return;
if(code == EAX)
cpu << other.prefix() << byte(0x90+(other.code % 8));
else if(other.code == EAX)
cpu << prefix() << byte(0x90+(code % 8));
else
cpu << other.prefix(code) << '\x87' << other.modrm(code);
}
void Register::copy_address(MemAddress address) {
address.bitMode = sizeof(void*) * 8;
address.other = code;
cpu << address.prefix() << '\x8D' << address;
}
void Register::operator<<=(Register& other) {
if(other.code != ECX)
throw "Can only rotate by ECX";
cpu << prefix() << '\xD3' << modrm(EX_4);
}
void Register::operator>>=(Register& other) {
if(other.code != ECX)
throw "Can only rotate by ECX";
cpu << prefix() << '\xD3' << modrm(EX_7);
}
void Register::rightshift_logical(Register& other) {
if(other.code != ECX)
throw "Can only rotate by ECX";
cpu << prefix() << '\xD3' << modrm(EX_5);
}
void Register::operator+=(unsigned int amount) {
if(amount == 0) return;
if(code == EAX) {
cpu << prefix() << '\x05' << amount;
}
else if(amount <= CHAR_MAX) {
cpu << prefix() <<'\x83' << modrm(EX_0) << (byte)amount;
}
else {
cpu << prefix() << '\x81' << modrm(EX_0) << amount;
}
}
void Register::operator+=(MemAddress address) {
address.other = code;
cpu << address.prefix() << '\x03' << address;
}
void Register::operator+=(Register& other) {
cpu << other.prefix(*this) << '\x03' << other.modrm(code);
}
void Register::operator-=(unsigned int amount) {
if(amount == 0) return;
if(code == EAX) {
cpu << '\x2D' << amount;
}
else if(amount <= CHAR_MAX) {
cpu << prefix() <<'\x83' << modrm(EX_5) << (byte)amount;
}
else {
cpu << prefix() << '\x81' << modrm(EX_5) << amount;
}
}
void Register::operator-=(Register& other) {
cpu << other.prefix(*this) << '\x2B' << other.modrm(code);
}
void Register::operator-=(MemAddress address) {
address.other = code;
cpu << address.prefix() << '\x2B' << address;
}
void Register::operator*=(MemAddress address) {
address.other = code;
cpu << address.prefix() << '\x0F' << '\xAF' << address;
}