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[FAST486]

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Implement SHLD and SHRD.


svn path=/branches/ntvdm/; revision=60930
This commit is contained in:
Aleksandar Andrejevic 2013-11-11 00:57:59 +00:00
parent 43bbc0afb4
commit 83b597be5a
2 changed files with 190 additions and 4 deletions
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192
lib/fast486/extraops.c
View file

@ -201,16 +201,16 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
Fast486ExtOpcodePopFs,
NULL, // Invalid
Fast486ExtOpcodeBitTest,
NULL, // TODO: OPCODE 0xA4 NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xA5 NOT IMPLEMENTED
Fast486ExtOpcodeShld,
Fast486ExtOpcodeShld,
NULL, // Invalid
NULL, // Invalid
Fast486ExtOpcodePushGs,
Fast486ExtOpcodePopGs,
NULL, // Invalid
Fast486ExtOpcodeBts,
NULL, // TODO: OPCODE 0xAC NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xAD NOT IMPLEMENTED
Fast486ExtOpcodeShrd,
Fast486ExtOpcodeShrd,
NULL, // TODO: OPCODE 0xAE NOT IMPLEMENTED
Fast486ExtOpcodeImul,
Fast486ExtOpcodeCmpXchgByte,
@ -601,6 +601,98 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBitTest)
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShld)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UCHAR Count;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xA4);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (Opcode == 0xA4)
{
/* Fetch the count */
if (!Fast486FetchByte(State, &Count))
{
/* Exception occurred */
return FALSE;
}
}
else
{
/* The count is in CL */
Count = State->GeneralRegs[FAST486_REG_ECX].LowByte;
}
/* Normalize the count */
if (OperandSize) Count &= 0x1F;
else Count &= 0x0F;
/* Do nothing if the count is zero */
if (Count == 0) return TRUE;
if (OperandSize)
{
ULONG Source, Destination, Result;
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = (Destination << Count) | (Source >> (32 - Count));
/* Update flags */
State->Flags.Cf = (Destination >> (32 - Count)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_LONG)
!= (Destination & SIGN_FLAG_LONG);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
return Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
}
else
{
USHORT Source, Destination, Result;
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = (Destination << Count) | (Source >> (16 - Count));
/* Update flags */
State->Flags.Cf = (Destination >> (16 - Count)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_WORD)
!= (Destination & SIGN_FLAG_WORD);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
return Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePushGs)
{
/* Call the internal API */
@ -712,6 +804,98 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBts)
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShrd)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UCHAR Count;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xAC);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (Opcode == 0xAC)
{
/* Fetch the count */
if (!Fast486FetchByte(State, &Count))
{
/* Exception occurred */
return FALSE;
}
}
else
{
/* The count is in CL */
Count = State->GeneralRegs[FAST486_REG_ECX].LowByte;
}
/* Normalize the count */
if (OperandSize) Count &= 0x1F;
else Count &= 0x0F;
/* Do nothing if the count is zero */
if (Count == 0) return TRUE;
if (OperandSize)
{
ULONG Source, Destination, Result;
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = (Destination >> Count) | (Source << (32 - Count));
/* Update flags */
State->Flags.Cf = (Destination >> (Count - 1)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_LONG)
!= (Destination & SIGN_FLAG_LONG);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
return Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
}
else
{
USHORT Source, Destination, Result;
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = (Destination >> Count) | (Source << (16 - Count));
/* Update flags */
State->Flags.Cf = (Result >> (Count - 1)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_WORD)
!= (Destination & SIGN_FLAG_WORD);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
return Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul)
{
BOOLEAN OperandSize, AddressSize;

2
lib/fast486/extraops.h
View file

@ -34,9 +34,11 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLoadDebugReg);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePushFs);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePopFs);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBitTest);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShld);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePushGs);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePopGs);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBts);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShrd);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg);