/**
* Returns the current code scanner enabled flag.
*
* @returns COM status code
* @param enabled address of result variable
*/
STDMETHODIMP MachineDebugger::COMGETTER(CSAMEnabled)(BOOL *enabled)
{
if (!enabled)
return E_POINTER;
if (gpVM)
*enabled = CSAMIsEnabled(gpVM);
else
*enabled = false;
return S_OK;
}
/**
* Mark a page as scanned/not scanned
*
* @note: we always mark it as scanned, even if we haven't completely done so
*
* @returns VBox status code.
* @param pVM Pointer to the VM.
* @param pPage GC page address (not necessarily aligned)
* @param fScanned Mark as scanned or not scanned
*
*/
VMM_INT_DECL(int) CSAMMarkPage(PVM pVM, RTRCUINTPTR pPage, bool fScanned)
{
int pgdir, bit;
uintptr_t page;
#ifdef LOG_ENABLED
if (fScanned && !CSAMIsPageScanned(pVM, (RTRCPTR)pPage))
Log(("CSAMMarkPage %RRv\n", pPage));
#endif
if (!CSAMIsEnabled(pVM))
return VINF_SUCCESS;
Assert(!HMIsEnabled(pVM));
page = (uintptr_t)pPage;
pgdir = page >> X86_PAGE_4M_SHIFT;
bit = (page & X86_PAGE_4M_OFFSET_MASK) >> X86_PAGE_4K_SHIFT;
Assert(pgdir < CSAM_PGDIRBMP_CHUNKS);
Assert(bit < PAGE_SIZE);
if(!CTXSUFF(pVM->csam.s.pPDBitmap)[pgdir])
{
STAM_COUNTER_INC(&pVM->csam.s.StatBitmapAlloc);
int rc = MMHyperAlloc(pVM, CSAM_PAGE_BITMAP_SIZE, 0, MM_TAG_CSAM, (void **)&pVM->csam.s.CTXSUFF(pPDBitmap)[pgdir]);
if (RT_FAILURE(rc))
{
Log(("MMHyperAlloc failed with %Rrc\n", rc));
return rc;
}
#ifdef IN_RC
pVM->csam.s.pPDHCBitmapGC[pgdir] = MMHyperRCToR3(pVM, (RCPTRTYPE(void*))pVM->csam.s.pPDBitmapGC[pgdir]);
if (!pVM->csam.s.pPDHCBitmapGC[pgdir])
{
Log(("MMHyperHC2GC failed for %RRv\n", pVM->csam.s.pPDBitmapGC[pgdir]));
return rc;
}
#else
pVM->csam.s.pPDGCBitmapHC[pgdir] = MMHyperR3ToRC(pVM, pVM->csam.s.pPDBitmapHC[pgdir]);
if (!pVM->csam.s.pPDGCBitmapHC[pgdir])
{
Log(("MMHyperHC2GC failed for %RHv\n", pVM->csam.s.pPDBitmapHC[pgdir]));
return rc;
}
#endif
}
if(fScanned)
ASMBitSet((void *)pVM->csam.s.CTXSUFF(pPDBitmap)[pgdir], bit);
else
ASMBitClear((void *)pVM->csam.s.CTXSUFF(pPDBitmap)[pgdir], bit);
return VINF_SUCCESS;
}
/**
* Check if this page needs to be analysed by CSAM.
*
* This function should only be called for supervisor pages and
* only when CSAM is enabled. Leaving these selection criteria
* to the caller simplifies the interface (PTE passing).
*
* Note that the page has not yet been synced, so the TLB trick
* (which wasn't ever active anyway) cannot be applied.
*
* @returns true if the page should be marked not present because
* CSAM want need to scan it.
* @returns false if the page was already scanned.
* @param pVM Pointer to the VM.
* @param GCPtr GC pointer of page
*/
VMM_INT_DECL(bool) CSAMDoesPageNeedScanning(PVM pVM, RTRCUINTPTR GCPtr)
{
if(!CSAMIsEnabled(pVM))
return false;
if(CSAMIsPageScanned(pVM, (RTRCPTR)GCPtr))
{
/* Already checked! */
STAM_COUNTER_ADD(&CTXSUFF(pVM->csam.s.StatNrKnownPages), 1);
return false;
}
STAM_COUNTER_ADD(&CTXSUFF(pVM->csam.s.StatNrPageNP), 1);
return true;
}
/**
* Check if this page needs to be analysed by CSAM
*
* @returns VBox status code
* @param pVM Pointer to the VM.
* @param pvFault Fault address
*/
VMM_INT_DECL(int) CSAMExecFault(PVM pVM, RTRCPTR pvFault)
{
if(!CSAMIsEnabled(pVM))
return VINF_SUCCESS;
LogFlow(("CSAMGCExecFault: for page %08X scanned=%d\n", pvFault, CSAMIsPageScanned(pVM, pvFault)));
if(CSAMIsPageScanned(pVM, pvFault))
{
// Already checked!
STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesGC, 1);
return VINF_SUCCESS;
}
STAM_COUNTER_ADD(&pVM->csam.s.StatNrTraps, 1);
VMCPU_FF_SET(VMMGetCpu0(pVM), VMCPU_FF_CSAM_SCAN_PAGE);
return VINF_CSAM_PENDING_ACTION;
}
/**
* Returns the current code scanner enabled flag.
*
* @returns COM status code
* @param aEnabled address of result variable
*/
STDMETHODIMP MachineDebugger::COMGETTER(CSAMEnabled) (BOOL *aEnabled)
{
CheckComArgOutPointerValid(aEnabled);
AutoCaller autoCaller(this);
if (FAILED(autoCaller.rc())) return autoCaller.rc();
AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
Console::SafeVMPtrQuiet pVM (mParent);
if (pVM.isOk())
*aEnabled = CSAMIsEnabled (pVM.raw());
else
*aEnabled = false;
return S_OK;
}
