/** * 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; } }