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[SOFT386]

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Allow the DS segment to overriden in LODS, MOVS and CMPS.


svn path=/branches/ntvdm/; revision=60689
This commit is contained in:
Aleksandar Andrejevic 2013-10-16 03:44:06 +00:00
parent 40ed113494
commit 6bbc6fef9a
1 changed files with 21 additions and 8 deletions
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29
lib/soft386/opcodes.c
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@ -6080,6 +6080,7 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeMovs)
{
ULONG Data, DataSize;
BOOLEAN OperandSize, AddressSize;
SOFT386_SEG_REGS Segment = SOFT386_REG_DS;
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
@ -6098,6 +6099,12 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeMovs)
AddressSize = !AddressSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_SEG)
{
/* Use the override segment instead of DS */
Segment = State->SegmentOverride;
}
/* Calculate the size */
if (Opcode == 0xA4) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
@ -6148,7 +6155,7 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeMovs)
/* Read from memory */
if (!Soft386ReadMemory(State,
SOFT386_REG_DS,
Segment,
AddressSize ? State->GeneralRegs[SOFT386_REG_ESI].Long
: State->GeneralRegs[SOFT386_REG_ESI].LowWord,
FALSE,
@ -6267,6 +6274,7 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeCmps)
ULONG FirstValue = 0, SecondValue = 0, Result;
ULONG DataSize, DataMask, SignFlag;
BOOLEAN OperandSize, AddressSize;
SOFT386_SEG_REGS Segment = SOFT386_REG_DS;
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
@ -6285,12 +6293,10 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeCmps)
AddressSize = !AddressSize;
}
if ((State->PrefixFlags & SOFT386_PREFIX_REP)
|| (State->PrefixFlags & SOFT386_PREFIX_REPNZ))
if (State->PrefixFlags & SOFT386_PREFIX_SEG)
{
// TODO: The REP/REPZ/REPNZ prefixes need to be implemented!
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
/* Use the override segment instead of DS */
Segment = State->SegmentOverride;
}
/* Calculate the size */
@ -6303,7 +6309,7 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeCmps)
/* Read from the first source operand */
if (!Soft386ReadMemory(State,
SOFT386_REG_DS,
Segment,
AddressSize ? State->GeneralRegs[SOFT386_REG_ESI].Long
: State->GeneralRegs[SOFT386_REG_ESI].LowWord,
FALSE,
@ -6553,6 +6559,7 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeLods)
{
ULONG DataSize;
BOOLEAN OperandSize, AddressSize;
SOFT386_SEG_REGS Segment = SOFT386_REG_DS;
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
@ -6571,6 +6578,12 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeLods)
AddressSize = !AddressSize;
}
if (State->PrefixFlags & SOFT386_PREFIX_SEG)
{
/* Use the override segment instead of DS */
Segment = State->SegmentOverride;
}
/* Calculate the size */
if (Opcode == 0xAC) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
@ -6598,7 +6611,7 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeLods)
/* Read from the source operand */
if (!Soft386ReadMemory(State,
SOFT386_REG_DS,
Segment,
AddressSize ? State->GeneralRegs[SOFT386_REG_ESI].Long
: State->GeneralRegs[SOFT386_REG_ESI].LowWord,
FALSE,