pcsx2/common/include/x86emitter/implement/jmpcall.h

67 lines
2.4 KiB
C++

/* 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 <http://www.gnu.org/licenses/>.
*/
#pragma once
// Implementations found here: CALL and JMP! (unconditional only)
namespace x86Emitter {
#ifdef __GNUG__
// GCC has a bug that causes the templated function handler for Jmp/Call emitters to generate
// bad asm code. (error is something like "7#*_uber_379s_mangled_$&02_name is already defined!")
// Using GCC's always_inline attribute fixes it. This differs from __forceinline in that it
// inlines *even in debug builds* which is (usually) undesirable.
// ... except when it avoids compiler bugs.
# define __always_inline_tmpl_fail __attribute__((always_inline))
#else
# define __always_inline_tmpl_fail
#endif
extern void xJccKnownTarget( JccComparisonType comparison, const void* target, bool slideForward );
// ------------------------------------------------------------------------
struct xImpl_JmpCall
{
bool isJmp;
void operator()( const xRegister32& absreg ) const;
void operator()( const ModSib32& src ) const;
void operator()( const xRegister16& absreg ) const;
void operator()( const ModSib16& src ) const;
// Special form for calling functions. This form automatically resolves the
// correct displacement based on the size of the instruction being generated.
template< typename T > __forceinline __always_inline_tmpl_fail
void operator()( T* func ) const
{
if( isJmp )
xJccKnownTarget( Jcc_Unconditional, (void*)(uptr)func, false ); // double cast to/from (uptr) needed to appease GCC
else
{
// calls are relative to the instruction after this one, and length is
// always 5 bytes (16 bit calls are bad mojo, so no bother to do special logic).
sptr dest = (sptr)func - ((sptr)xGetPtr() + 5);
xWrite8( 0xe8 );
xWrite32( dest );
}
}
};
} // End namespace x86Emitter