Author: aandrejevic Date: Thu Nov 7 00:57:08 2013 New Revision: 60877
URL: http://svn.reactos.org/svn/reactos?rev=60877&view=rev Log: [FAST486] Implement BSF, BSR and MOVSX.
Modified: branches/ntvdm/lib/fast486/extraops.c branches/ntvdm/lib/fast486/extraops.h
Modified: branches/ntvdm/lib/fast486/extraops.c URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/extraops.c?rev... ============================================================================== --- branches/ntvdm/lib/fast486/extraops.c [iso-8859-1] (original) +++ branches/ntvdm/lib/fast486/extraops.c [iso-8859-1] Thu Nov 7 00:57:08 2013 @@ -225,10 +225,10 @@ Fast486OpcodeGroup0FB9, Fast486OpcodeGroup0FBA, Fast486ExtOpcodeBtc, - NULL, // TODO: OPCODE 0xBC NOT IMPLEMENTED - NULL, // TODO: OPCODE 0xBD NOT IMPLEMENTED - NULL, // TODO: OPCODE 0xBE NOT IMPLEMENTED - NULL, // TODO: OPCODE 0xBF NOT IMPLEMENTED + Fast486ExtOpcodeBsf, + Fast486ExtOpcodeBsr, + Fast486ExtOpcodeMovsxByte, + Fast486ExtOpcodeMovsxWord, Fast486ExtOpcodeXaddByte, Fast486ExtOpcodeXadd, NULL, // Invalid @@ -1036,6 +1036,252 @@ return TRUE; }
+FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsf) +{ + INT i; + ULONG Dummy = 0, Value = 0; + BOOLEAN OperandSize, AddressSize; + FAST486_MOD_REG_RM ModRegRm; + ULONG BitNumber; + UINT DataSize; + + OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size; + TOGGLE_OPSIZE(OperandSize); + TOGGLE_ADSIZE(AddressSize); + + /* Make sure this is the right instruction */ + ASSERT(Opcode == 0xBC); + + /* Get the number of bits */ + if (OperandSize) DataSize = 32; + else DataSize = 16; + + /* Get the operands */ + if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm)) + { + /* Exception occurred */ + return FALSE; + } + + /* Read the value */ + if (OperandSize) + { + if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value)) + { + /* Exception occurred */ + return FALSE; + } + } + else + { + if (!Fast486ReadModrmWordOperands(State, + &ModRegRm, + (PUSHORT)&Dummy, + (PUSHORT)&Value)) + { + /* Exception occurred */ + return FALSE; + } + } + + /* Clear ZF */ + State->Flags.Zf = FALSE; + + for (i = 0; i < DataSize; i++) + { + if(Value & (1 << i)) + { + /* Set ZF */ + State->Flags.Zf = TRUE; + + /* Save the bit number */ + BitNumber = i; + + /* Exit the loop */ + break; + } + } + + if (State->Flags.Zf) + { + /* Write back the result */ + if (OperandSize) + { + if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber)) + { + /* Exception occurred */ + return FALSE; + } + } + else + { + if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber))) + { + /* Exception occurred */ + return FALSE; + } + } + } + + return TRUE; +} + +FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsr) +{ + INT i; + ULONG Dummy = 0, Value = 0; + BOOLEAN OperandSize, AddressSize; + FAST486_MOD_REG_RM ModRegRm; + ULONG BitNumber; + UINT DataSize; + + OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size; + TOGGLE_OPSIZE(OperandSize); + TOGGLE_ADSIZE(AddressSize); + + /* Make sure this is the right instruction */ + ASSERT(Opcode == 0xBD); + + /* Get the number of bits */ + if (OperandSize) DataSize = 32; + else DataSize = 16; + + /* Get the operands */ + if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm)) + { + /* Exception occurred */ + return FALSE; + } + + /* Read the value */ + if (OperandSize) + { + if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value)) + { + /* Exception occurred */ + return FALSE; + } + } + else + { + if (!Fast486ReadModrmWordOperands(State, + &ModRegRm, + (PUSHORT)&Dummy, + (PUSHORT)&Value)) + { + /* Exception occurred */ + return FALSE; + } + } + + /* Clear ZF */ + State->Flags.Zf = FALSE; + + for (i = DataSize - 1; i >= 0; i--) + { + if(Value & (1 << i)) + { + /* Set ZF */ + State->Flags.Zf = TRUE; + + /* Save the bit number */ + BitNumber = i; + + /* Exit the loop */ + break; + } + } + + if (State->Flags.Zf) + { + /* Write back the result */ + if (OperandSize) + { + if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber)) + { + /* Exception occurred */ + return FALSE; + } + } + else + { + if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber))) + { + /* Exception occurred */ + return FALSE; + } + } + } + + return TRUE; +} + +FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxByte) +{ + UCHAR Dummy; + CHAR Value; + BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size; + FAST486_MOD_REG_RM ModRegRm; + + TOGGLE_ADSIZE(AddressSize); + + /* Make sure this is the right instruction */ + ASSERT(Opcode == 0xBE); + + /* Get the operands */ + if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm)) + { + /* Exception occurred */ + return FALSE; + } + + /* Read the operands */ + if (!Fast486ReadModrmByteOperands(State, &ModRegRm, &Dummy, (PUCHAR)&Value)) + { + /* Exception occurred */ + return FALSE; + } + + /* Write back the sign-extended value */ + return Fast486WriteModrmDwordOperands(State, + &ModRegRm, + TRUE, + (ULONG)((LONG)Value)); +} + +FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxWord) +{ + USHORT Dummy; + SHORT Value; + BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size; + FAST486_MOD_REG_RM ModRegRm; + + TOGGLE_ADSIZE(AddressSize); + + /* Make sure this is the right instruction */ + ASSERT(Opcode == 0xBF); + + /* Get the operands */ + if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm)) + { + /* Exception occurred */ + return FALSE; + } + + /* Read the operands */ + if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Dummy, (PUSHORT)&Value)) + { + /* Exception occurred */ + return FALSE; + } + + /* Write back the sign-extended value */ + return Fast486WriteModrmDwordOperands(State, + &ModRegRm, + TRUE, + (ULONG)((LONG)Value)); +} + FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp) { BOOLEAN Jump = FALSE;
Modified: branches/ntvdm/lib/fast486/extraops.h URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/extraops.h?rev... ============================================================================== --- branches/ntvdm/lib/fast486/extraops.h [iso-8859-1] (original) +++ branches/ntvdm/lib/fast486/extraops.h [iso-8859-1] Thu Nov 7 00:57:08 2013 @@ -41,6 +41,10 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg); FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr); FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc); +FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsf); +FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsr); +FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxByte); +FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxWord); FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp); FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet); FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXaddByte);
-
aandrejevic＠svn.reactos.org