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[SOFT386]

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Implement the LEAVE instruction.


svn path=/branches/ntvdm/; revision=60201
This commit is contained in:
Aleksandar Andrejevic 2013-09-18 21:13:40 +00:00
parent 9620dafb0c
commit 3dc329ae81
1 changed files with 40 additions and 3 deletions
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43
lib/soft386/opcodes.c
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@ -4208,10 +4208,47 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeEnter)
SOFT386_OPCODE_HANDLER(Soft386OpcodeLeave)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
return FALSE;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC9);
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 (Size)
{
/* Set the stack pointer (ESP) to the base pointer (EBP) */
State->GeneralRegs[SOFT386_REG_ESP].Long = State->GeneralRegs[SOFT386_REG_EBP].Long;
/* Pop the saved base pointer from the stack */
return Soft386StackPop(State, &State->GeneralRegs[SOFT386_REG_EBP].Long);
}
else
{
ULONG Value;
/* Set the stack pointer (SP) to the base pointer (BP) */
State->GeneralRegs[SOFT386_REG_ESP].LowWord = State->GeneralRegs[SOFT386_REG_EBP].LowWord;
/* Pop the saved base pointer from the stack */
if (Soft386StackPop(State, &Value))
{
State->GeneralRegs[SOFT386_REG_EBP].LowWord = LOWORD(Value);
return TRUE;
}
else return FALSE;
}
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeRetFarImm)