/**
* Disarms an int 3 breakpoint.
* This is used to implement both DBGFR3BpClear() and DBGFR3BpDisable().
*
* @returns VBox status code.
* @param pVM The VM handle.
* @param pBp The breakpoint.
*/
static int dbgfR3BpInt3Disarm(PVM pVM, PDBGFBP pBp)
{
/* @todo SMP support! */
VMCPUID idCpu = 0;
/*
* Check that the current byte is the int3 instruction, and restore the original one.
* We currently ignore invalid bytes.
*/
DBGFADDRESS Addr;
DBGFR3AddrFromFlat(pVM, &Addr, pBp->GCPtr);
uint8_t bCurrent;
int rc = DBGFR3MemRead(pVM, idCpu, &Addr, &bCurrent, 1);
if (bCurrent == 0xcc)
rc = DBGFR3MemWrite(pVM, idCpu, &Addr, &pBp->u.Int3.bOrg, 1);
return rc;
}
/**
* Arms an int 3 breakpoint.
* This is used to implement both DBGFR3BpSetReg() and DBGFR3BpEnable().
*
* @returns VBox status code.
* @param pVM The VM handle.
* @param pBp The breakpoint.
*/
static int dbgfR3BpInt3Arm(PVM pVM, PDBGFBP pBp)
{
/** @todo should actually use physical address here! */
/* @todo SMP support! */
VMCPUID idCpu = 0;
/*
* Save current byte and write int3 instruction.
*/
DBGFADDRESS Addr;
DBGFR3AddrFromFlat(pVM, &Addr, pBp->GCPtr);
int rc = DBGFR3MemRead(pVM, idCpu, &Addr, &pBp->u.Int3.bOrg, 1);
if (RT_SUCCESS(rc))
{
static const uint8_t s_bInt3 = 0xcc;
rc = DBGFR3MemWrite(pVM, idCpu, &Addr, &s_bInt3, 1);
}
return rc;
}
/**
* @interface_method_impl{DBGCCMDHLP,pfnMemWrite}
*/
static DECLCALLBACK(int) dbgcHlpMemWrite(PDBGCCMDHLP pCmdHlp, const void *pvBuffer, size_t cbWrite, PCDBGCVAR pVarPointer, size_t *pcbWritten)
{
PDBGC pDbgc = DBGC_CMDHLP2DBGC(pCmdHlp);
DBGFADDRESS Address;
int rc;
/*
* Dummy check.
*/
if (cbWrite == 0)
{
if (*pcbWritten)
*pcbWritten = 0;
return VINF_SUCCESS;
}
/*
* Convert Far addresses getting size and the correct base address.
* Getting and checking the size is what makes this messy and slow.
*/
DBGCVAR Var = *pVarPointer;
switch (pVarPointer->enmType)
{
case DBGCVAR_TYPE_GC_FAR:
{
/* Use DBGFR3AddrFromSelOff for the conversion. */
Assert(pDbgc->pUVM);
rc = DBGFR3AddrFromSelOff(pDbgc->pUVM, pDbgc->idCpu, &Address, Var.u.GCFar.sel, Var.u.GCFar.off);
if (RT_FAILURE(rc))
return rc;
/* don't bother with flat selectors (for now). */
if (!DBGFADDRESS_IS_FLAT(&Address))
{
DBGFSELINFO SelInfo;
rc = DBGFR3SelQueryInfo(pDbgc->pUVM, pDbgc->idCpu, Address.Sel,
DBGFSELQI_FLAGS_DT_GUEST | DBGFSELQI_FLAGS_DT_ADJ_64BIT_MODE, &SelInfo);
if (RT_SUCCESS(rc))
{
RTGCUINTPTR cb; /* -1 byte */
if (DBGFSelInfoIsExpandDown(&SelInfo))
{
if ( !SelInfo.u.Raw.Gen.u1Granularity
&& Address.off > UINT16_C(0xffff))
return VERR_OUT_OF_SELECTOR_BOUNDS;
if (Address.off <= SelInfo.cbLimit)
return VERR_OUT_OF_SELECTOR_BOUNDS;
cb = (SelInfo.u.Raw.Gen.u1Granularity ? UINT32_C(0xffffffff) : UINT32_C(0xffff)) - Address.off;
}
else
{
if (Address.off > SelInfo.cbLimit)
return VERR_OUT_OF_SELECTOR_BOUNDS;
cb = SelInfo.cbLimit - Address.off;
}
if (cbWrite - 1 > cb)
{
if (!pcbWritten)
return VERR_OUT_OF_SELECTOR_BOUNDS;
cbWrite = cb + 1;
}
}
}
Var.enmType = DBGCVAR_TYPE_GC_FLAT;
Var.u.GCFlat = Address.FlatPtr;
}
/* fall thru */
case DBGCVAR_TYPE_GC_FLAT:
rc = DBGFR3MemWrite(pDbgc->pUVM, pDbgc->idCpu,
DBGFR3AddrFromFlat(pDbgc->pUVM, &Address, Var.u.GCFlat),
pvBuffer, cbWrite);
if (pcbWritten && RT_SUCCESS(rc))
*pcbWritten = cbWrite;
return rc;
case DBGCVAR_TYPE_GC_PHYS:
rc = DBGFR3MemWrite(pDbgc->pUVM, pDbgc->idCpu,
DBGFR3AddrFromPhys(pDbgc->pUVM, &Address, Var.u.GCPhys),
pvBuffer, cbWrite);
if (pcbWritten && RT_SUCCESS(rc))
*pcbWritten = cbWrite;
return rc;
case DBGCVAR_TYPE_HC_FLAT:
case DBGCVAR_TYPE_HC_PHYS:
{
/*
* Copy HC memory page by page.
*/
if (pcbWritten)
*pcbWritten = 0;
while (cbWrite > 0)
{
/* convert to flat address */
DBGCVAR Var2;
rc = dbgcOpAddrFlat(pDbgc, &Var, DBGCVAR_CAT_ANY, &Var2);
if (RT_FAILURE(rc))
{
if (pcbWritten && *pcbWritten)
return -VERR_INVALID_POINTER;
return VERR_INVALID_POINTER;
}
/* calc size. */
size_t cbChunk = PAGE_SIZE;
cbChunk -= (uintptr_t)Var.u.pvHCFlat & PAGE_OFFSET_MASK;
if (cbChunk > cbWrite)
cbChunk = cbWrite;
/** @todo protect this!!! */
memcpy(Var2.u.pvHCFlat, pvBuffer, cbChunk);
/* advance */
if (Var.enmType == DBGCVAR_TYPE_HC_FLAT)
Var.u.pvHCFlat = (uint8_t *)Var.u.pvHCFlat + cbChunk;
else
Var.u.HCPhys += cbChunk;
pvBuffer = (uint8_t const *)pvBuffer + cbChunk;
if (pcbWritten)
*pcbWritten += cbChunk;
cbWrite -= cbChunk;
}
return VINF_SUCCESS;
}
default:
return VERR_NOT_IMPLEMENTED;
}
}
