mirror of https://github.com/PCSX2/pcsx2.git
156 lines
5.2 KiB
C++
156 lines
5.2 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2009 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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// ------------------------------------------------------------------------
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// helpers.h -- Various universally helpful functions for emitter convenience!
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//
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// Note: Header file should be included from the x86Emitter::Internal namespace, such
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// that all members contained within are in said namespace.
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// ------------------------------------------------------------------------
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#pragma once
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#define OpWriteSSE( pre, op ) xOpWrite0F( pre, op, to, from )
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extern void SimdPrefix( u8 prefix, u16 opcode );
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extern void EmitSibMagic( uint regfield, const void* address );
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extern void EmitSibMagic( uint regfield, const ModSibBase& info );
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extern void xJccKnownTarget( JccComparisonType comparison, const void* target, bool slideForward );
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template< typename T > bool Is8BitOp() { return sizeof(T) == 1; }
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template< typename T > void prefix16() { if( sizeof(T) == 2 ) xWrite8( 0x66 ); }
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// Writes a ModRM byte for "Direct" register access forms, which is used for all
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// instructions taking a form of [reg,reg].
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template< typename T > __emitinline
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void EmitSibMagic( uint reg1, const xRegisterBase<T>& reg2 )
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{
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xWrite8( (Mod_Direct << 6) | (reg1 << 3) | reg2.Id );
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}
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template< typename T1, typename T2 > __emitinline
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void EmitSibMagic( const xRegisterBase<T1> reg1, const xRegisterBase<T2>& reg2 )
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{
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xWrite8( (Mod_Direct << 6) | (reg1.Id << 3) | reg2.Id );
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}
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template< typename T1 > __emitinline
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void EmitSibMagic( const xRegisterBase<T1> reg1, const void* src ) { EmitSibMagic( reg1.Id, src ); }
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template< typename T1 > __emitinline
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void EmitSibMagic( const xRegisterBase<T1> reg1, const ModSibBase& sib ) { EmitSibMagic( reg1.Id, sib ); }
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// ------------------------------------------------------------------------
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template< typename T1, typename T2 > __emitinline
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void xOpWrite( u8 prefix, u8 opcode, const T1& param1, const T2& param2 )
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{
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if( prefix != 0 )
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xWrite16( (opcode<<8) | prefix );
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else
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xWrite8( opcode );
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EmitSibMagic( param1, param2 );
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}
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// ------------------------------------------------------------------------
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template< typename T1, typename T2 > __emitinline
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void xOpWrite0F( u8 prefix, u16 opcode, const T1& param1, const T2& param2 )
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{
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SimdPrefix( prefix, opcode );
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EmitSibMagic( param1, param2 );
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}
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template< typename T1, typename T2 > __emitinline
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void xOpWrite0F( u8 prefix, u16 opcode, const T1& param1, const T2& param2, u8 imm8 )
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{
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xOpWrite0F( prefix, opcode, param1, param2 );
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xWrite8( imm8 );
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}
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template< typename T1, typename T2 > __emitinline
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void xOpWrite0F( u16 opcode, const T1& param1, const T2& param2 ) { xOpWrite0F( 0, opcode, param1, param2 ); }
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template< typename T1, typename T2 > __emitinline
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void xOpWrite0F( u16 opcode, const T1& param1, const T2& param2, u8 imm8 ) { xOpWrite0F( 0, opcode, param1, param2, imm8 ); }
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// ------------------------------------------------------------------------
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template< typename xImpl, typename T >
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void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect<T>& to, const xImmReg<T>& immOrReg )
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{
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if( to.IsDirect() )
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{
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if( immOrReg.IsReg() )
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helpme( to.GetReg(), immOrReg.GetReg() );
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else
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helpme( to.GetReg(), immOrReg.GetImm() );
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}
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else
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{
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if( immOrReg.IsReg() )
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helpme( to.GetMem(), immOrReg.GetReg() );
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else
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helpme( to.GetMem(), immOrReg.GetImm() );
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}
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}
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template< typename xImpl, typename T >
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void _DoI_helpermess( const xImpl& helpme, const ModSibBase& to, const xImmReg<T>& immOrReg )
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{
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if( immOrReg.IsReg() )
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helpme( to, immOrReg.GetReg() );
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else
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helpme( ModSibStrict<T>(to), immOrReg.GetImm() );
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}
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template< typename xImpl, typename T >
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void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect<T>& to, int imm )
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{
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if( to.IsDirect() )
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helpme( to.GetReg(), imm );
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else
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helpme( to.GetMem(), imm );
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}
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template< typename xImpl, typename T >
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void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect<T>& parm )
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{
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if( parm.IsDirect() )
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helpme( parm.GetReg() );
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else
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helpme( parm.GetMem() );
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}
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template< typename xImpl, typename T >
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void _DoI_helpermess( const xImpl& helpme, const xDirectOrIndirect<T>& to, const xDirectOrIndirect<T>& from )
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{
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if( to.IsDirect() && from.IsDirect() )
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helpme( to.GetReg(), from.GetReg() );
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else if( to.IsDirect() )
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helpme( to.GetReg(), from.GetMem() );
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else if( from.IsDirect() )
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helpme( to.GetMem(), from.GetReg() );
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else
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// One of the fields needs to be direct, or else we cannot complete the operation.
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// (intel doesn't support indirects in both fields)
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pxFailDev( "Invalid asm instruction: Both operands are indirect memory addresses." );
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}
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