mirror of https://github.com/PCSX2/pcsx2.git
67 lines
2.4 KiB
C++
67 lines
2.4 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2010 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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#pragma once
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// Implementations found here: CALL and JMP! (unconditional only)
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namespace x86Emitter {
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#ifdef __GNUG__
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// GCC has a bug that causes the templated function handler for Jmp/Call emitters to generate
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// bad asm code. (error is something like "7#*_uber_379s_mangled_$&02_name is already defined!")
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// Using GCC's always_inline attribute fixes it. This differs from __forceinline in that it
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// inlines *even in debug builds* which is (usually) undesirable.
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// ... except when it avoids compiler bugs.
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# define __always_inline_tmpl_fail __attribute__((always_inline))
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#else
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# define __always_inline_tmpl_fail
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#endif
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extern void xJccKnownTarget( JccComparisonType comparison, const void* target, bool slideForward );
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// ------------------------------------------------------------------------
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struct xImpl_JmpCall
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{
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bool isJmp;
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void operator()( const xRegister32& absreg ) const;
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void operator()( const xIndirect32& src ) const;
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void operator()( const xRegister16& absreg ) const;
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void operator()( const xIndirect16& src ) const;
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// Special form for calling functions. This form automatically resolves the
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// correct displacement based on the size of the instruction being generated.
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template< typename T > __forceinline __always_inline_tmpl_fail
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void operator()( T* func ) const
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{
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if( isJmp )
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xJccKnownTarget( Jcc_Unconditional, (void*)(uptr)func, false ); // double cast to/from (uptr) needed to appease GCC
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else
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{
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// calls are relative to the instruction after this one, and length is
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// always 5 bytes (16 bit calls are bad mojo, so no bother to do special logic).
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sptr dest = (sptr)func - ((sptr)xGetPtr() + 5);
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xWrite8( 0xe8 );
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xWrite32( dest );
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}
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}
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};
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} // End namespace x86Emitter
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