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[SOFT386]

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Implement the far absolute indirect JMP/CALL instructions in group 0xFF.


svn path=/branches/ntvdm/; revision=60688
This commit is contained in:
Aleksandar Andrejevic
2013-10-16 03:14:12 +00:00
parent 489dfb314e
commit 40ed113494
1 changed files with 171 additions and 8 deletions
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lib/soft386/opgroups.c
+171 -8
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@@ -1508,11 +1508,93 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFF)
/* Set the EIP to the address */
State->InstPtr.Long = Value;
}
else if (ModRegRm.Register == 3)
{
USHORT Selector;
INT Segment = SOFT386_REG_DS;
/* Check for the segment override */
if (State->PrefixFlags & SOFT386_PREFIX_SEG)
{
/* Use the override segment instead */
Segment = State->SegmentOverride;
}
/* Read the selector */
if (!Soft386ReadMemory(State,
Segment,
ModRegRm.MemoryAddress + sizeof(ULONG),
FALSE,
&Selector,
sizeof(USHORT)))
{
/* Exception occurred */
return FALSE;
}
/* Push the current value of CS */
if (!Soft386StackPush(State, State->SegmentRegs[SOFT386_REG_CS].Selector))
{
/* Exception occurred */
return FALSE;
}
/* Push the current value of EIP */
if (!Soft386StackPush(State, State->InstPtr.Long))
{
/* Exception occurred */
return FALSE;
}
/* Load the new code segment */
if (!Soft386LoadSegment(State, SOFT386_REG_CS, Selector))
{
/* Exception occurred */
return FALSE;
}
/* Set the EIP to the address */
State->InstPtr.Long = Value;
}
else if (ModRegRm.Register == 4)
{
/* Set the EIP to the address */
State->InstPtr.Long = Value;
}
else if (ModRegRm.Register == 5)
{
USHORT Selector;
INT Segment = SOFT386_REG_DS;
/* Check for the segment override */
if (State->PrefixFlags & SOFT386_PREFIX_SEG)
{
/* Use the override segment instead */
Segment = State->SegmentOverride;
}
/* Read the selector */
if (!Soft386ReadMemory(State,
Segment,
ModRegRm.MemoryAddress + sizeof(ULONG),
FALSE,
&Selector,
sizeof(USHORT)))
{
/* Exception occurred */
return FALSE;
}
/* Load the new code segment */
if (!Soft386LoadSegment(State, SOFT386_REG_CS, Selector))
{
/* Exception occurred */
return FALSE;
}
/* Set the EIP to the address */
State->InstPtr.Long = Value;
}
else if (ModRegRm.Register == 6)
{
/* Push the value on to the stack */
@@ -1569,16 +1651,105 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFF)
/* Set the IP to the address */
State->InstPtr.LowWord = Value;
}
else if (ModRegRm.Register == 3)
{
USHORT Selector;
INT Segment = SOFT386_REG_DS;
/* Check for the segment override */
if (State->PrefixFlags & SOFT386_PREFIX_SEG)
{
/* Use the override segment instead */
Segment = State->SegmentOverride;
}
/* Read the selector */
if (!Soft386ReadMemory(State,
Segment,
ModRegRm.MemoryAddress + sizeof(USHORT),
FALSE,
&Selector,
sizeof(USHORT)))
{
/* Exception occurred */
return FALSE;
}
/* Push the current value of CS */
if (!Soft386StackPush(State, State->SegmentRegs[SOFT386_REG_CS].Selector))
{
/* Exception occurred */
return FALSE;
}
/* Push the current value of IP */
if (!Soft386StackPush(State, State->InstPtr.LowWord))
{
/* Exception occurred */
return FALSE;
}
/* Load the new code segment */
if (!Soft386LoadSegment(State, SOFT386_REG_CS, Selector))
{
/* Exception occurred */
return FALSE;
}
/* Set the IP to the address */
State->InstPtr.LowWord = Value;
}
else if (ModRegRm.Register == 4)
{
/* Set the IP to the address */
State->InstPtr.LowWord = Value;
}
else if (ModRegRm.Register == 5)
{
USHORT Selector;
INT Segment = SOFT386_REG_DS;
/* Check for the segment override */
if (State->PrefixFlags & SOFT386_PREFIX_SEG)
{
/* Use the override segment instead */
Segment = State->SegmentOverride;
}
/* Read the selector */
if (!Soft386ReadMemory(State,
Segment,
ModRegRm.MemoryAddress + sizeof(USHORT),
FALSE,
&Selector,
sizeof(USHORT)))
{
/* Exception occurred */
return FALSE;
}
/* Load the new code segment */
if (!Soft386LoadSegment(State, SOFT386_REG_CS, Selector))
{
/* Exception occurred */
return FALSE;
}
/* Set the IP to the address */
State->InstPtr.LowWord = Value;
}
else if (ModRegRm.Register == 6)
{
/* Push the value on to the stack */
return Soft386StackPush(State, Value);
}
else
{
/* Invalid */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
if (ModRegRm.Register <= 1)
{
@@ -1595,14 +1766,6 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFF)
}
}
if ((ModRegRm.Register == 3)
|| (ModRegRm.Register == 5)
|| (ModRegRm.Register == 7))
{
UNIMPLEMENTED;
return FALSE; // NOT IMPLEMENTED
}
return TRUE;
}