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[SOFT386]

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Implement the IMUL instruction. Both versions have been implemented in Soft386OpcodeImulModrm.


svn path=/branches/ntvdm/; revision=60344
This commit is contained in:
Aleksandar Andrejevic 2013-09-23 17:29:42 +00:00
parent 442b56b45b
commit 597a77ed3c
2 changed files with 120 additions and 13 deletions
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132
lib/soft386/opcodes.c
View file

@ -11,6 +11,7 @@
// #define WIN32_NO_STATUS
// #define _INC_WINDOWS
#include <windef.h>
#include <limits.h>
// #define NDEBUG
#include <debug.h>
@ -131,7 +132,7 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
Soft386OpcodePushImm,
Soft386OpcodeImulModrmImm,
Soft386OpcodePushByteImm,
Soft386OpcodeImulModrmByteImm,
Soft386OpcodeImulModrmImm,
NULL, // TODO: OPCODE 0x6C NOT SUPPORTED
NULL, // TODO: OPCODE 0x6D NOT SUPPORTED
NULL, // TODO: OPCODE 0x6E NOT SUPPORTED
@ -3797,10 +3798,125 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodePushImm)
SOFT386_OPCODE_HANDLER(Soft386OpcodeImulModrmImm)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
BOOLEAN OperandSize, AddressSize;
SOFT386_MOD_REG_RM ModRegRm;
LONG Multiplier;
LONGLONG Product;
return FALSE;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x69);
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the address size */
AddressSize = !AddressSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the operand size */
OperandSize = !OperandSize;
}
/* Fetch the parameters */
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (Opcode == 0x6B)
{
CHAR Byte;
/* Fetch the immediate operand */
if (!Soft386FetchByte(State, (PUCHAR)&Byte))
{
/* Exception occurred */
return FALSE;
}
Multiplier = (LONG)Byte;
}
else
{
if (OperandSize)
{
LONG Dword;
/* Fetch the immediate operand */
if (!Soft386FetchDword(State, (PULONG)&Dword))
{
/* Exception occurred */
return FALSE;
}
Multiplier = Dword;
}
else
{
SHORT Word;
/* Fetch the immediate operand */
if (!Soft386FetchWord(State, (PUSHORT)&Word))
{
/* Exception occurred */
return FALSE;
}
Multiplier = (LONG)Word;
}
}
if (OperandSize)
{
LONG RegValue, Multiplicand;
/* Read the operands */
if (!Soft386ReadModrmDwordOperands(State,
&ModRegRm,
(PULONG)&RegValue,
(PULONG)&Multiplicand))
{
/* Exception occurred */
return FALSE;
}
/* Multiply */
Product = (LONGLONG)Multiplicand * (LONGLONG)Multiplier;
}
else
{
SHORT RegValue, Multiplicand;
/* Read the operands */
if (!Soft386ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)&RegValue,
(PUSHORT)&Multiplicand))
{
/* Exception occurred */
return FALSE;
}
/* Multiply */
Product = (LONGLONG)Multiplicand * (LONGLONG)Multiplier;
}
/* Check for carry/overflow */
if ((Product < LONG_MIN) || (Product > LONG_MAX))
{
State->Flags.Cf = State->Flags.Of = TRUE;
}
else State->Flags.Cf = State->Flags.Of = FALSE;
/* Write-back the result */
return Soft386WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)((LONG)Product));
}
SOFT386_OPCODE_HANDLER(Soft386OpcodePushByteImm)
@ -3820,14 +3936,6 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodePushByteImm)
return Soft386StackPush(State, Data);
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeImulModrmByteImm)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
return FALSE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovByteModrm)
{
UCHAR FirstValue, SecondValue, Result;

1
lib/soft386/opcodes.h
View file

@ -101,7 +101,6 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeArpl);
SOFT386_OPCODE_HANDLER(Soft386OpcodePushImm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeImulModrmImm);
SOFT386_OPCODE_HANDLER(Soft386OpcodePushByteImm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeImulModrmByteImm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovByteModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovModrm);
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovStoreSeg);