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x86emitter: implement some function to emit the REX prefix 

Same fashion as EmitSibMagic
This commit is contained in:
Gregory Hainaut 2016-01-16 20:47:13 +01:00
parent 53b5ecf34a
commit be0b8cf2f5
2 changed files with 55 additions and 1 deletions
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6
common/include/x86emitter/internal.h
View File

@ -31,6 +31,12 @@ namespace x86Emitter {
extern void EmitSibMagic( const xRegisterBase& reg1, const void* src );
extern void EmitSibMagic( const xRegisterBase& reg1, const xIndirectVoid& sib );
void EmitRex( const xRegisterBase& reg1, const xRegisterBase& reg2 );
void EmitRex( const xRegisterBase& reg1, const void* src );
void EmitRex( const xRegisterBase& reg1, const xIndirectVoid& sib );
void EmitRex( const xRegisterBase& reg1 );
void EmitRex( const xIndirectVoid& sib );
extern void _xMovRtoR( const xRegisterInt& to, const xRegisterInt& from );
template< typename T > inline

50
common/src/x86emitter/x86emitter.cpp
View File

@ -321,8 +321,9 @@ static __fi bool NeedsSibMagic( const xIndirectVoid& info )
//
void EmitSibMagic( uint regfield, const xIndirectVoid& info )
{
// 3 bits also on x86_64 (so max is 8)
// We might need to mask it on x86_64
pxAssertDev( regfield < 8, "Invalid x86 register identifier." );
int displacement_size = (info.Displacement == 0) ? 0 :
( ( info.IsByteSizeDisp() ) ? 1 : 2 );
@ -404,6 +405,53 @@ void EmitSibMagic( const xRegisterBase& reg1, const xIndirectVoid& sib )
EmitSibMagic( reg1.Id, sib );
}
//////////////////////////////////////////////////////////////////////////////////////////
void EmitRex( const xRegisterBase& reg1, const xRegisterBase& reg2 )
{
u8 w = reg1.IsWide() << 3;
u8 r = reg1.IsExtended() << 2;
u8 x = 0;
u8 b = reg2.IsExtended();
xWrite8( 0x40 | w | r | x | b );
}
void EmitRex( const xRegisterBase& reg1, const void* src )
{
pxAssert(0); //see fixme
u8 w = reg1.IsWide() << 3;
u8 r = reg1.IsExtended() << 2;
u8 x = 0;
u8 b = 0; // FIXME src.IsExtended();
xWrite8( 0x40 | w | r | x | b );
}
void EmitRex( const xRegisterBase& reg1, const xIndirectVoid& sib )
{
u8 w = reg1.IsWide() << 3;
u8 r = reg1.IsExtended() << 2;
u8 x = sib.Index.IsExtended() << 1;
u8 b = sib.Base.IsExtended();
xWrite8( 0x40 | w | r | x | b );
}
void EmitRex( const xRegisterBase& reg1)
{
u8 w = reg1.IsWide() << 3;
u8 r = 0;
u8 x = 0;
u8 b = reg1.IsExtended();
xWrite8( 0x40 | w | r | x | b );
}
void EmitRex( const xIndirectVoid& sib)
{
u8 w = sib.Base.IsWide() << 3;
u8 r = 0;
u8 x = 0;
u8 b = sib.IsExtended();
xWrite8( 0x40 | w | r | x | b );
}
// --------------------------------------------------------------------------------------
// xSetPtr / xAlignPtr / xGetPtr / xAdvancePtr
// --------------------------------------------------------------------------------------