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[FAST486]

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Fix ENTER and LEAVE in the same way I fixed PUSH and POP in the previous 2 commits.


svn path=/trunk/; revision=67322
This commit is contained in:
Aleksandar Andrejevic 2015-04-20 02:22:56 +00:00
parent 399547ef48
commit 53abec3cb5
1 changed files with 18 additions and 14 deletions
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32
reactos/lib/fast486/opcodes.c
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@ -4405,16 +4405,24 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeEnter)
if (NestingLevel > 0) Fast486StackPush(State, FramePointer.Long);
/* Set EBP to the frame pointer */
State->GeneralRegs[FAST486_REG_EBP] = FramePointer;
if (Size) State->GeneralRegs[FAST486_REG_EBP].Long = FramePointer.Long;
else State->GeneralRegs[FAST486_REG_EBP].LowWord = FramePointer.LowWord;
/* Reserve space for the frame */
if (Size) State->GeneralRegs[FAST486_REG_ESP].Long -= (ULONG)FrameSize;
else State->GeneralRegs[FAST486_REG_ESP].LowWord -= FrameSize;
if (State->SegmentRegs[FAST486_REG_SS].Size)
{
State->GeneralRegs[FAST486_REG_ESP].Long -= (ULONG)FrameSize;
}
else
{
State->GeneralRegs[FAST486_REG_ESP].LowWord -= FrameSize;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeLeave)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
ULONG Value;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC9);
@ -4422,26 +4430,22 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeLeave)
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
if (State->SegmentRegs[FAST486_REG_SS].Size)
{
/* Set the stack pointer (ESP) to the base pointer (EBP) */
State->GeneralRegs[FAST486_REG_ESP].Long = State->GeneralRegs[FAST486_REG_EBP].Long;
/* Pop the saved base pointer from the stack */
Fast486StackPop(State, &State->GeneralRegs[FAST486_REG_EBP].Long);
}
else
{
ULONG Value;
/* Set the stack pointer (SP) to the base pointer (BP) */
State->GeneralRegs[FAST486_REG_ESP].LowWord = State->GeneralRegs[FAST486_REG_EBP].LowWord;
}
/* Pop the saved base pointer from the stack */
if (Fast486StackPop(State, &Value))
{
State->GeneralRegs[FAST486_REG_EBP].LowWord = LOWORD(Value);
}
/* Pop the saved base pointer from the stack */
if (Fast486StackPop(State, &Value))
{
if (Size) State->GeneralRegs[FAST486_REG_EBP].Long = Value;
else State->GeneralRegs[FAST486_REG_EBP].LowWord = LOWORD(Value);
}
}