pcsx2/common/include/x86emitter/internal.h

/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2010  PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "x86types.h"
#include "instructions.h"


namespace x86Emitter
{

#define OpWriteSSE(pre, op) xOpWrite0F(pre, op, to, from)

extern void SimdPrefix(u8 prefix, u16 opcode);
extern void EmitSibMagic(uint regfield, const void *address);
extern void EmitSibMagic(uint regfield, const xIndirectVoid &info);
extern void EmitSibMagic(uint reg1, const xRegisterBase &reg2);
extern void EmitSibMagic(const xRegisterBase &reg1, const xRegisterBase &reg2);
extern void EmitSibMagic(const xRegisterBase &reg1, const void *src);
extern void EmitSibMagic(const xRegisterBase &reg1, const xIndirectVoid &sib);

extern void EmitRex(uint regfield, const void *address);
extern void EmitRex(uint regfield, const xIndirectVoid &info);
extern void EmitRex(uint reg1, const xRegisterBase &reg2);
extern void EmitRex(const xRegisterBase &reg1, const xRegisterBase &reg2);
extern void EmitRex(const xRegisterBase &reg1, const void *src);
extern void EmitRex(const xRegisterBase &reg1, const xIndirectVoid &sib);

extern void _xMovRtoR(const xRegisterInt &to, const xRegisterInt &from);

template <typename T>
inline void xWrite(T val)
{
    *(T *)x86Ptr = val;
    x86Ptr += sizeof(T);
}

template <typename T1, typename T2>
__emitinline void xOpWrite(u8 prefix, u8 opcode, const T1 &param1, const T2 &param2)
{
    if (prefix != 0)
        xWrite8(prefix);
    EmitRex(param1, param2);

    xWrite8(opcode);

    EmitSibMagic(param1, param2);
}

template <typename T1, typename T2>
__emitinline void xOpAccWrite(u8 prefix, u8 opcode, const T1 &param1, const T2 &param2)
{
    if (prefix != 0)
        xWrite8(prefix);
    EmitRex(param1, param2);

    xWrite8(opcode);
}


//////////////////////////////////////////////////////////////////////////////////////////
// emitter helpers for xmm instruction with prefixes, most of which are using
// the basic opcode format (items inside braces denote optional or conditional
// emission):
//
//   [Prefix] / 0x0f / [OpcodePrefix] / Opcode / ModRM+[SibSB]
//
// Prefixes are typically 0x66, 0xf2, or 0xf3.  OpcodePrefixes are either 0x38 or
// 0x3a [and other value will result in assertion failue].
//
template <typename T1, typename T2>
__emitinline void xOpWrite0F(u8 prefix, u16 opcode, const T1 &param1, const T2 &param2)
{
    if (prefix != 0)
        xWrite8(prefix);
    EmitRex(param1, param2);

    SimdPrefix(0, opcode);

    EmitSibMagic(param1, param2);
}

template <typename T1, typename T2>
__emitinline void xOpWrite0F(u8 prefix, u16 opcode, const T1 &param1, const T2 &param2, u8 imm8)
{
    xOpWrite0F(prefix, opcode, param1, param2);
    xWrite8(imm8);
}

template <typename T1, typename T2>
__emitinline void xOpWrite0F(u16 opcode, const T1 &param1, const T2 &param2)
{
    xOpWrite0F(0, opcode, param1, param2);
}

template <typename T1, typename T2>
__emitinline void xOpWrite0F(u16 opcode, const T1 &param1, const T2 &param2, u8 imm8)
{
    xOpWrite0F(0, opcode, param1, param2, imm8);
}

// VEX 2 Bytes Prefix
template <typename T1, typename T2, typename T3>
__emitinline void xOpWriteC5(u8 prefix, u8 opcode, const T1 &param1, const T2 &param2, const T3 &param3)
{
    pxAssert(prefix == 0 || prefix == 0x66 || prefix == 0xF3 || prefix == 0xF2);

    const xRegisterInt &reg = param1.IsReg() ? param1 : param2;

#ifdef __x86_64__
    u8 nR = reg.IsExtended() ? 0x00 : 0x80;
#else
    u8 nR = 0x80;
#endif
    u8 L = reg.IsWideSIMD() ? 4 : 0;

    u8 nv = (~param2.GetId() & 0xF) << 3;

    u8 p =
        prefix == 0xF2 ? 3 :
                         prefix == 0xF3 ? 2 :
                                          prefix == 0x66 ? 1 : 0;

    xWrite8(0xC5);
    xWrite8(nR | nv | L | p);
    xWrite8(opcode);
    EmitSibMagic(param1, param3);
}

// VEX 3 Bytes Prefix
template <typename T1, typename T2, typename T3>
__emitinline void xOpWriteC4(u8 prefix, u8 mb_prefix, u8 opcode, const T1 &param1, const T2 &param2, const T3 &param3, int w = -1)
{
    pxAssert(prefix == 0 || prefix == 0x66 || prefix == 0xF3 || prefix == 0xF2);
    pxAssert(mb_prefix == 0x0F || mb_prefix == 0x38 || mb_prefix == 0x3A);

    const xRegisterInt &reg = param1.IsReg() ? param1 : param2;

#ifdef __x86_64__
    u8 nR = reg.IsExtended() ? 0x00 : 0x80;
    u8 nB = param3.IsExtended() ? 0x00 : 0x20;
    u8 nX = 0x40; // likely unused so hardwired to disabled
#else
    u8 nR = 0x80;
    u8 nB = 0x20;
    u8 nX = 0x40;
#endif
    u8 L = reg.IsWideSIMD() ? 4 : 0;
    u8 W = (w == -1) ? (reg.GetOperandSize() == 8 ? 0x80 : 0) : // autodetect the size
               0x80 * w;                                        // take directly the W value

    u8 nv = (~param2.GetId() & 0xF) << 3;

    u8 p =
        prefix == 0xF2 ? 3 :
                         prefix == 0xF3 ? 2 :
                                          prefix == 0x66 ? 1 : 0;

    u8 m =
        mb_prefix == 0x3A ? 3 :
                            mb_prefix == 0x38 ? 2 : 1;

    xWrite8(0xC4);
    xWrite8(nR | nX | nB | m);
    xWrite8(W | nv | L | p);
    xWrite8(opcode);
    EmitSibMagic(param1, param3);
}
}