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[FAST486]

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Fix the Mod-Reg-R/M parser. EBP cannot be used as a SIB byte base,
instead it's used to mark that the base is an immediate operand.


svn path=/branches/ntvdm/; revision=60944
This commit is contained in:
Aleksandar Andrejevic 2013-11-11 17:24:22 +00:00
parent 0d174d717c
commit 1d21bb125f
1 changed files with 15 additions and 1 deletions
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16
lib/fast486/common.inl
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@ -719,7 +719,21 @@ Fast486ParseModRegRm(PFAST486_STATE State,
Index = (SibByte >> 3) & 0x07;
if (Index != FAST486_REG_ESP) Index = State->GeneralRegs[Index].Long;
else Index = 0;
Base = State->GeneralRegs[SibByte & 0x07].Long;
if ((SibByte & 0x07) != FAST486_REG_EBP)
{
/* Use the register a base */
Base = State->GeneralRegs[SibByte & 0x07].Long;
}
else
{
/* Fetch the base */
if (!Fast486FetchDword(State, &Base))
{
/* Exception occurred */
return FALSE;
}
}
/* Calculate the address */
ModRegRm->MemoryAddress = Base + Index * Scale;