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[SOFT386]

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Implement the ENTER instruction.


svn path=/branches/ntvdm/; revision=60350
This commit is contained in:
Aleksandar Andrejevic 2013-09-25 18:34:57 +00:00
parent 597a77ed3c
commit e05e583e56
1 changed files with 68 additions and 3 deletions
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71
lib/soft386/opcodes.c
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@ -4492,10 +4492,75 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeLds)
SOFT386_OPCODE_HANDLER(Soft386OpcodeEnter)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
INT i;
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
USHORT FrameSize;
UCHAR NestingLevel;
SOFT386_REG FramePointer;
return FALSE;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC8);
if (State->PrefixFlags & SOFT386_PREFIX_LOCK)
{
/* Invalid prefix */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
if (State->PrefixFlags == SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
Size = !Size;
}
if (!Soft386FetchWord(State, &FrameSize))
{
/* Exception occurred */
return FALSE;
}
if (!Soft386FetchByte(State, &NestingLevel))
{
/* Exception occurred */
return FALSE;
}
/* Push EBP */
if (!Soft386StackPush(State, State->GeneralRegs[SOFT386_REG_EBP].Long))
{
/* Exception occurred */
return FALSE;
}
/* Save ESP */
FramePointer = State->GeneralRegs[SOFT386_REG_ESP];
/* Set up the nested procedure stacks */
for (i = 1; i < NestingLevel; i++)
{
if (Size)
{
State->GeneralRegs[SOFT386_REG_EBP].Long -= 4;
Soft386StackPush(State, State->GeneralRegs[SOFT386_REG_EBP].Long);
}
else
{
State->GeneralRegs[SOFT386_REG_EBP].LowWord -= 2;
Soft386StackPush(State, State->GeneralRegs[SOFT386_REG_EBP].LowWord);
}
}
if (NestingLevel > 0) Soft386StackPush(State, FramePointer.Long);
/* Set EBP to the frame pointer */
State->GeneralRegs[SOFT386_REG_EBP] = FramePointer;
/* Reserve space for the frame */
if (Size) State->GeneralRegs[SOFT386_REG_ESP].Long -= (ULONG)FrameSize;
else State->GeneralRegs[SOFT386_REG_ESP].LowWord -= FrameSize;
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeLeave)