/**
* Raises a generic debug event if enabled and not being ignored.
*
* @returns Strict VBox status code.
* @retval VINF_EM_DBG_EVENT if the event was raised and the caller should
* return ASAP to the debugger (via EM).
* @retval VINF_SUCCESS if the event was disabled or ignored.
*
* @param pVM The cross context VM structure.
* @param pVCpu The cross context virtual CPU structure.
* @param enmEvent The generic event being raised.
* @param uEventArg The argument of that event.
* @param enmCtx The context in which this event is being raised.
*
* @thread EMT(pVCpu)
*/
VMM_INT_DECL(VBOXSTRICTRC) DBGFEventGenericWithArg(PVM pVM, PVMCPU pVCpu, DBGFEVENTTYPE enmEvent, uint64_t uEventArg,
DBGFEVENTCTX enmCtx)
{
/*
* Is it enabled.
*/
if (dbgfEventIsGenericWithArgEnabled(pVM, enmEvent, uEventArg))
{
/*
* Any events on the stack. Should the incoming event be ignored?
*/
uint64_t const rip = CPUMGetGuestRIP(pVCpu);
uint32_t i = pVCpu->dbgf.s.cEvents;
if (i > 0)
{
while (i-- > 0)
{
if ( pVCpu->dbgf.s.aEvents[i].Event.enmType == enmEvent
&& pVCpu->dbgf.s.aEvents[i].enmState == DBGFEVENTSTATE_IGNORE
&& pVCpu->dbgf.s.aEvents[i].rip == rip)
{
pVCpu->dbgf.s.aEvents[i].enmState = DBGFEVENTSTATE_RESTORABLE;
return VINF_SUCCESS;
}
Assert(pVCpu->dbgf.s.aEvents[i].enmState != DBGFEVENTSTATE_CURRENT);
}
/*
* Trim the event stack.
*/
i = pVCpu->dbgf.s.cEvents;
while (i-- > 0)
{
if ( pVCpu->dbgf.s.aEvents[i].rip == rip
&& ( pVCpu->dbgf.s.aEvents[i].enmState == DBGFEVENTSTATE_RESTORABLE
|| pVCpu->dbgf.s.aEvents[i].enmState == DBGFEVENTSTATE_IGNORE) )
pVCpu->dbgf.s.aEvents[i].enmState = DBGFEVENTSTATE_IGNORE;
else
{
if (i + 1 != pVCpu->dbgf.s.cEvents)
memmove(&pVCpu->dbgf.s.aEvents[i], &pVCpu->dbgf.s.aEvents[i + 1],
(pVCpu->dbgf.s.cEvents - i) * sizeof(pVCpu->dbgf.s.aEvents));
pVCpu->dbgf.s.cEvents--;
}
}
i = pVCpu->dbgf.s.cEvents;
AssertStmt(i < RT_ELEMENTS(pVCpu->dbgf.s.aEvents), i = RT_ELEMENTS(pVCpu->dbgf.s.aEvents) - 1);
}
/*
* Push the event.
*/
pVCpu->dbgf.s.aEvents[i].enmState = DBGFEVENTSTATE_CURRENT;
pVCpu->dbgf.s.aEvents[i].rip = rip;
pVCpu->dbgf.s.aEvents[i].Event.enmType = enmEvent;
pVCpu->dbgf.s.aEvents[i].Event.enmCtx = enmCtx;
pVCpu->dbgf.s.aEvents[i].Event.u.Generic.uArg = uEventArg;
pVCpu->dbgf.s.cEvents = i + 1;
return VINF_EM_DBG_EVENT;
}
return VINF_SUCCESS;
}
csamCodePageWriteHandler(PVM pVM, PVMCPU pVCpu, RTGCPTR GCPtr, void *pvPtr, void *pvBuf, size_t cbBuf,
PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin, void *pvUser)
{
Log(("csamCodePageWriteHandler: write to %RGv LB %zu\n", GCPtr, cbBuf));
Assert(enmAccessType == PGMACCESSTYPE_WRITE); NOREF(enmAccessType);
Assert(VMCPU_IS_EMT(pVCpu));
/*
* Check if it's a dummy write that doesn't change anything.
*/
if ( PAGE_ADDRESS(pvPtr) == PAGE_ADDRESS((uintptr_t)pvPtr + cbBuf - 1)
&& !memcmp(pvPtr, pvBuf, cbBuf))
{
Log(("csamCodePageWriteHandler: dummy write -> ignore\n"));
return VINF_PGM_HANDLER_DO_DEFAULT;
}
#ifdef IN_RING3
/*
* Ring-3: Do proper handling.
*/
int rc = PATMR3PatchWrite(pVM, GCPtr, (uint32_t)cbBuf);
AssertRC(rc);
return VINF_PGM_HANDLER_DO_DEFAULT;
#else
/*
* Raw-mode: Try avoid needing to go to ring-3 (same as csamRCCodePageWritePfHandler).
*/
uint32_t const cpl = CPUMGetGuestCPL(pVCpu);
bool const fPatchCode = PATMIsPatchGCAddr(pVM, CPUMGetGuestRIP(pVCpu));
PPATMGCSTATE pPATMGCState = PATMGetGCState(pVM);
Assert(pVM->csam.s.cDirtyPages < CSAM_MAX_DIRTY_PAGES);
Assert(pPATMGCState);
Assert(pPATMGCState->fPIF || fPatchCode);
# ifdef VBOX_WITH_REM
/* Flush the recompilers translation block cache as the guest seems to be modifying instructions. */
/** @todo a bit overkill?? */
REMFlushTBs(pVM);
# endif
/*
* When patch code is executing instructions that must complete, then we
* must *never* interrupt it.
*/
if (!pPATMGCState->fPIF && fPatchCode)
{
Log(("csamRCCodePageWriteHandler: fPIF=0 -> stack fault in patch generated code at %08RX32!\n", CPUMGetGuestRIP(pVCpu)));
return VINF_PGM_HANDLER_DO_DEFAULT;
}
Log(("csamRCCodePageWriteHandler: code page write at %RGv (cpl=%d)\n", GCPtr, cpl));
/*
* If user code is modifying one of our monitored pages, then we can safely
* write to it as it's no longer being used for supervisor code.
*/
if (cpl != 3)
{
VBOXSTRICTRC rcStrict = PATMRCHandleWriteToPatchPage(pVM, NULL /* pRegFrame = no interpret */, (RTRCPTR)GCPtr, cbBuf);
if ( rcStrict == VINF_PGM_HANDLER_DO_DEFAULT
|| rcStrict == VINF_SUCCESS)
return rcStrict;
if (rcStrict == VINF_EM_RAW_EMULATE_INSTR)
{
STAM_COUNTER_INC(&pVM->csam.s.StatDangerousWrite);
return VINF_EM_RAW_EMULATE_INSTR;
}
Assert(rcStrict == VERR_PATCH_NOT_FOUND);
}
/*
* Schedule ring-3 activity.
* Note that GCPtr might be a different address in case of aliases. So,
* take down both alternatives.
*/
VMCPU_FF_SET(pVCpu, VMCPU_FF_CSAM_PENDING_ACTION);
pVM->csam.s.pvDirtyBasePage[pVM->csam.s.cDirtyPages] = (RTRCPTR)GCPtr;
pVM->csam.s.pvDirtyFaultPage[pVM->csam.s.cDirtyPages] = (RTRCPTR)GCPtr;
if (++pVM->csam.s.cDirtyPages == CSAM_MAX_DIRTY_PAGES)
return VINF_CSAM_PENDING_ACTION;
/*
* Continue with the write. The VM_FF_CSAM_FLUSH_DIRTY_PAGE handler will reset it to readonly again.
*/
Log(("csamRCCodePageWriteHandler: enabled r/w for page %RGv (%RGv)\n", GCPtr, GCPtr));
STAM_COUNTER_INC(&pVM->csam.s.StatCodePageModified);
return VINF_PGM_HANDLER_DO_DEFAULT;
#endif
}
