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[FAST486]: Implement a basic support for the Trap Flag.

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svn path=/trunk/; revision=64803
This commit is contained in:
Hermès Bélusca-Maïto 2014-10-18 14:08:50 +00:00
parent 9333ffdf62
commit dcd0795cd0
2 changed files with 35 additions and 8 deletions
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19
reactos/lib/fast486/debug.c
View file

@ -83,7 +83,21 @@ NextInst:
* Check if there is an interrupt to execute, or a hardware interrupt signal
* while interrupts are enabled.
*/
if (State->IntStatus == FAST486_INT_EXECUTE)
if (State->Flags.Tf)
{
/* Perform the interrupt */
Fast486PerformInterrupt(State, 0x01);
/*
* Flags and TF are pushed on stack so we can reset TF now,
* to not break into the INT 0x01 handler.
* After the INT 0x01 handler returns, the flags and therefore
* TF are popped back off the stack and restored, so TF will be
* automatically reset to its previous state.
*/
State->Flags.Tf = FALSE;
}
else if (State->IntStatus == FAST486_INT_EXECUTE)
{
/* Perform the interrupt */
Fast486PerformInterrupt(State, State->PendingIntNum);
@ -91,8 +105,7 @@ NextInst:
/* Clear the interrupt status */
State->IntStatus = FAST486_INT_NONE;
}
else if (State->Flags.If && (State->IntStatus == FAST486_INT_SIGNAL)
&& (State->IntAckCallback != NULL))
else if (State->Flags.If && (State->IntStatus == FAST486_INT_SIGNAL))
{
/* Acknowledge the interrupt to get the number */
State->PendingIntNum = State->IntAckCallback(State);

24
reactos/lib/fast486/fast486.c
View file

@ -82,7 +82,21 @@ NextInst:
* Check if there is an interrupt to execute, or a hardware interrupt signal
* while interrupts are enabled.
*/
if (State->IntStatus == FAST486_INT_EXECUTE)
if (State->Flags.Tf)
{
/* Perform the interrupt */
Fast486PerformInterrupt(State, 0x01);
/*
* Flags and TF are pushed on stack so we can reset TF now,
* to not break into the INT 0x01 handler.
* After the INT 0x01 handler returns, the flags and therefore
* TF are popped back off the stack and restored, so TF will be
* automatically reset to its previous state.
*/
State->Flags.Tf = FALSE;
}
else if (State->IntStatus == FAST486_INT_EXECUTE)
{
/* Perform the interrupt */
Fast486PerformInterrupt(State, State->PendingIntNum);
@ -90,8 +104,7 @@ NextInst:
/* Clear the interrupt status */
State->IntStatus = FAST486_INT_NONE;
}
else if (State->Flags.If && (State->IntStatus == FAST486_INT_SIGNAL)
&& (State->IntAckCallback != NULL))
else if (State->Flags.If && (State->IntStatus == FAST486_INT_SIGNAL))
{
/* Acknowledge the interrupt to get the number */
State->PendingIntNum = State->IntAckCallback(State);
@ -171,8 +184,8 @@ Fast486IntAckCallback(PFAST486_STATE State)
{
UNREFERENCED_PARAMETER(State);
/* Return something... */
return 0;
/* Return something... defaulted to single-step interrupt */
return 0x01;
}
/* PUBLIC FUNCTIONS ***********************************************************/
@ -211,6 +224,7 @@ Fast486Reset(PFAST486_STATE State)
{
FAST486_SEG_REGS i;
/* Save the callbacks and TLB */
FAST486_MEM_READ_PROC MemReadCallback = State->MemReadCallback;
FAST486_MEM_WRITE_PROC MemWriteCallback = State->MemWriteCallback;
FAST486_IO_READ_PROC IoReadCallback = State->IoReadCallback;