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87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
/*
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Copyright (C) 2006 StrmnNrmn
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#pragma once
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#ifndef DYNAREC_ASSEMBLYUTILS_H_
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#define DYNAREC_ASSEMBLYUTILS_H_
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#include <stdlib.h>
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#include <stddef.h>
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#include "Base/Types.h"
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class CCodeLabel
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{
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public:
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CCodeLabel () : mpLocation( nullptr ) {}
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explicit CCodeLabel( const void * p_location )
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: mpLocation( p_location )
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{
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}
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bool IsSet() const { return mpLocation != nullptr; }
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const void * GetTarget() const { return mpLocation; }
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const u8 * GetTargetU8P() const { return reinterpret_cast< const u8 * >( mpLocation ); }
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private:
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const void * mpLocation; // This is the location of an arbitrary block of code
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};
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class CJumpLocation
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{
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public:
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CJumpLocation () : mpLocation( nullptr ) {}
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explicit CJumpLocation( void * p_location )
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: mpLocation( p_location )
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{
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}
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bool IsIn32BitRange(const CCodeLabel &label) const
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{
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ptrdiff_t difference = label.GetTargetU8P() - GetTargetU8P();
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return (difference >= INT32_MIN && difference <= INT32_MAX);
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}
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bool IsSet() const { return mpLocation != nullptr; }
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s32 GetOffset( const CCodeLabel & label ) const { return label.GetTargetU8P() - GetTargetU8P(); }
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const u8 * GetTargetU8P() const { return reinterpret_cast< const u8 * >( mpLocation ); }
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u8 * GetWritableU8P() const
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{
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return reinterpret_cast< u8 * >( make_uncached_ptr(mpLocation) );
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//Todo: Check this
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//return reinterpret_cast< u8 * >( mpLocation );
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}
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private:
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void * mpLocation; // This is the location of a jump instruction
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};
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namespace AssemblyUtils
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{
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bool PatchJumpLong( CJumpLocation jump, CCodeLabel target );
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bool PatchJumpLongAndFlush( CJumpLocation jump, CCodeLabel target );
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void ReplaceBranchWithJump( CJumpLocation branch, CCodeLabel target );
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}
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#endif // DYNAREC_ASSEMBLYUTILS_H_
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