/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2009 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 .
*/
// ------------------------------------------------------------------------
// helpers.h -- Various universally helpful functions for emitter convenience!
//
// Note: Header file should be included from the x86Emitter::Internal namespace, such
// that all members contained within are in said namespace.
// ------------------------------------------------------------------------
#pragma once
extern void SimdPrefix( u8 prefix, u16 opcode );
extern void EmitSibMagic( uint regfield, const void* address );
extern void EmitSibMagic( uint regfield, const ModSibBase& info );
extern void xJccKnownTarget( JccComparisonType comparison, const void* target, bool slideForward );
template< typename T > bool Is8BitOp() { return sizeof(T) == 1; }
template< typename T > void prefix16() { if( sizeof(T) == 2 ) xWrite8( 0x66 ); }
// Writes a ModRM byte for "Direct" register access forms, which is used for all
// instructions taking a form of [reg,reg].
template< typename T > __emitinline
void EmitSibMagic( uint reg1, const xRegisterBase& reg2 )
{
xWrite8( (Mod_Direct << 6) | (reg1 << 3) | reg2.Id );
}
template< typename T1, typename T2 > __emitinline
void EmitSibMagic( const xRegisterBase reg1, const xRegisterBase& reg2 )
{
xWrite8( (Mod_Direct << 6) | (reg1.Id << 3) | reg2.Id );
}
template< typename T1 > __emitinline
void EmitSibMagic( const xRegisterBase reg1, const void* src ) { EmitSibMagic( reg1.Id, src ); }
template< typename T1 > __emitinline
void EmitSibMagic( const xRegisterBase reg1, const ModSibBase& sib ) { EmitSibMagic( reg1.Id, sib ); }
// ------------------------------------------------------------------------
template< typename T1, typename T2 > __emitinline
void xOpWrite( u8 prefix, u8 opcode, const T1& param1, const T2& param2 )
{
if( prefix != 0 )
xWrite16( (opcode<<8) | prefix );
else
xWrite8( opcode );
EmitSibMagic( param1, param2 );
}
// ------------------------------------------------------------------------
template< typename T1, typename T2 > __emitinline
void xOpWrite0F( u8 prefix, u16 opcode, const T1& param1, const T2& param2 )
{
SimdPrefix( prefix, 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 ); }
// ------------------------------------------------------------------------
template< typename xImpl, typename T >
void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect& to, const xImmReg& immOrReg )
{
if( to.IsDirect() )
{
if( immOrReg.IsReg() )
helpme( to.GetReg(), immOrReg.GetReg() );
else
helpme( to.GetReg(), immOrReg.GetImm() );
}
else
{
if( immOrReg.IsReg() )
helpme( to.GetMem(), immOrReg.GetReg() );
else
helpme( to.GetMem(), immOrReg.GetImm() );
}
}
template< typename xImpl, typename T >
void _DoI_helpermess( const xImpl& helpme, const ModSibBase& to, const xImmReg& immOrReg )
{
if( immOrReg.IsReg() )
helpme( to, immOrReg.GetReg() );
else
helpme( ModSibStrict(to), immOrReg.GetImm() );
}
template< typename xImpl, typename T >
void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect& to, int imm )
{
if( to.IsDirect() )
helpme( to.GetReg(), imm );
else
helpme( to.GetMem(), imm );
}
template< typename xImpl, typename T >
void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect& parm )
{
if( parm.IsDirect() )
helpme( parm.GetReg() );
else
helpme( parm.GetMem() );
}
template< typename xImpl, typename T >
void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect& to, const xDirectOrIndirect& from )
{
if( to.IsDirect() && from.IsDirect() )
helpme( to.GetReg(), from.GetReg() );
else if( to.IsDirect() )
helpme( to.GetReg(), from.GetMem() );
else if( from.IsDirect() )
helpme( to.GetMem(), from.GetReg() );
else
// One of the fields needs to be direct, or else we cannot complete the operation.
// (intel doesn't support indirects in both fields)
jASSUME( false );
}