/* $Id: TRPMGCHandlers.cpp 1321 2007-03-08 10:07:12Z vboxsync $ */ /** @file * TRPM - Guest Context Trap Handlers, CPP part */ /* * Copyright (C) 2006 InnoTek Systemberatung GmbH * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License as published by the Free Software Foundation, * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE * distribution. VirtualBox OSE is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY of any kind. * * If you received this file as part of a commercial VirtualBox * distribution, then only the terms of your commercial VirtualBox * license agreement apply instead of the previous paragraph. */ /******************************************************************************* * Header Files * *******************************************************************************/ #define LOG_GROUP LOG_GROUP_TRPM #include #include #include #include #include #include #include #include #include #include #include "TRPMInternal.h" #include #include #include #include #include #include #include #include #include #include /* still here. MODR/M byte parsing */ #define X86_OPCODE_MODRM_MOD_MASK 0xc0 #define X86_OPCODE_MODRM_REG_MASK 0x38 #define X86_OPCODE_MODRM_RM_MASK 0x07 /** Pointer to a readonly hypervisor trap record. */ typedef const struct TRPMGCHYPER *PCTRPMGCHYPER; /** * A hypervisor trap record. * This contains information about a handler for a instruction range. * * @remark This must match what TRPM_HANDLER outputs. */ typedef struct TRPMGCHYPER { /** The start address. */ uintptr_t uStartEIP; /** The end address. (exclusive) * If NULL the it's only for the instruction at pvStartEIP. */ uintptr_t uEndEIP; /** * The handler. * * @returns VBox status code * VINF_SUCCESS means we've handled the trap. * Any other error code means returning to the host context. * @param pVM The VM handle. * @param pRegFrame The register frame. * @param uUser The user argument. */ DECLCALLBACKMEMBER(int, pfnHandler)(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser); /** Whatever the handler desires to put here. */ uintptr_t uUser; } TRPMGCHYPER; /******************************************************************************* * Global Variables * *******************************************************************************/ __BEGIN_DECLS /** Defined in VMMGC0.asm or VMMGC99.asm. * @{ */ extern const TRPMGCHYPER g_aTrap0bHandlers[1]; extern const TRPMGCHYPER g_aTrap0bHandlersEnd[1]; extern const TRPMGCHYPER g_aTrap0dHandlers[1]; extern const TRPMGCHYPER g_aTrap0dHandlersEnd[1]; extern const TRPMGCHYPER g_aTrap0eHandlers[1]; extern const TRPMGCHYPER g_aTrap0eHandlersEnd[1]; /** @} */ __END_DECLS /******************************************************************************* * Internal Functions * *******************************************************************************/ __BEGIN_DECLS /* addressed from asm (not called so no DECLASM). */ DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser); __END_DECLS /** * Exits the trap, called when exiting a trap handler. * * Will reset the trap if it's not a guest trap or the trap * is already handled. Will process resume guest FFs. * * @returns rc. * @param pVM VM handle. * @param rc The VBox status code to return. * @param pRegFrame Pointer to the register frame for the trap. */ static int trpmGCExitTrap(PVM pVM, int rc, PCPUMCTXCORE pRegFrame) { uint32_t uOldActiveVector = pVM->trpm.s.uActiveVector; /* Reset trap? */ if ( rc != VINF_EM_RAW_GUEST_TRAP && rc != VINF_EM_RAW_RING_SWITCH_INT) pVM->trpm.s.uActiveVector = ~0; #ifdef VBOX_HIGH_RES_TIMERS_HACK /* * Occationally we should poll timers. * We must *NOT* do this too frequently as it adds a significant overhead * and it'll kill us if the trap load is high. (See #1354.) * (The heuristic is not very intelligent, we should really check trap * frequency etc. here, but alas, we lack any such information atm.) */ static unsigned s_iTimerPoll = 0; if (rc == VINF_SUCCESS) { if (!(++s_iTimerPoll & 0xf)) { uint64_t cTicks = TMTimerPoll(pVM); NOREF(cTicks); Log2(("TMTimerPoll at %VGv returned %RX64 (VM_FF_TIMER=%d)\n", pRegFrame->eip, cTicks, VM_FF_ISPENDING(pVM, VM_FF_TIMER))); } } else s_iTimerPoll = 0; #endif /* Clear pending inhibit interrupt state if required. (necessary for dispatching interrupts later on) */ if (VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS)) { Log2(("VM_FF_INHIBIT_INTERRUPTS at %VGv successor %VGv\n", pRegFrame->eip, EMGetInhibitInterruptsPC(pVM))); if (pRegFrame->eip != EMGetInhibitInterruptsPC(pVM)) { /** @note we intentionally don't clear VM_FF_INHIBIT_INTERRUPTS here if the eip is the same as the inhibited instr address. * Before we are able to execute this instruction in raw mode (iret to guest code) an external interrupt might * force a world switch again. Possibly allowing a guest interrupt to be dispatched in the process. This could * break the guest. Sounds very unlikely, but such timing sensitive problem are not as rare as you might think. */ VM_FF_CLEAR(pVM, VM_FF_INHIBIT_INTERRUPTS); } } /* * Pending resume-guest-FF? * Or pending (A)PIC interrupt? Windows XP will crash if we delay APIC interrupts. */ if ( rc == VINF_SUCCESS && VM_FF_ISPENDING(pVM, VM_FF_TO_R3 | VM_FF_TIMER | VM_FF_INTERRUPT_APIC | VM_FF_INTERRUPT_PIC | VM_FF_PGM_SYNC_CR3 | VM_FF_PGM_SYNC_CR3_NON_GLOBAL | VM_FF_REQUEST)) { /* Pending Ring-3 action. */ if (VM_FF_ISPENDING(pVM, VM_FF_TO_R3)) { VM_FF_CLEAR(pVM, VM_FF_TO_R3); rc = VINF_EM_RAW_TO_R3; } /* Pending timer action. */ else if (VM_FF_ISPENDING(pVM, VM_FF_TIMER)) rc = VINF_EM_RAW_TIMER_PENDING; /* Pending interrupt: dispatch it. */ else if ( VM_FF_ISPENDING(pVM, VM_FF_INTERRUPT_APIC | VM_FF_INTERRUPT_PIC) && !VM_FF_ISSET(pVM, VM_FF_INHIBIT_INTERRUPTS) && PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame) ) { uint8_t u8Interrupt; rc = PDMGetInterrupt(pVM, &u8Interrupt); Log(("trpmGCExitTrap: u8Interrupt=%d (%#x) rc=%Vrc\n", u8Interrupt, u8Interrupt, rc)); AssertFatalMsgRC(rc, ("PDMGetInterrupt failed with %Vrc\n", rc)); rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)u8Interrupt, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_HARDWARE_INT); /* can't return if successful */ Assert(rc != VINF_SUCCESS); /* Stop the profile counter that was started in TRPMGCHandlersA.asm */ Assert(uOldActiveVector <= 16); STAM_PROFILE_ADV_STOP(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a); /* Assert the trap and go to the recompiler to dispatch it. */ TRPMAssertTrap(pVM, u8Interrupt, false); STAM_PROFILE_ADV_START(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a); rc = VINF_EM_RAW_INTERRUPT_PENDING; } /* * Try sync CR3? * This ASSUMES that the MOV CRx, x emulation doesn't return with VINF_PGM_SYNC_CR3. (a bit hackish) */ else if (VM_FF_ISPENDING(pVM, VM_FF_PGM_SYNC_CR3 | VM_FF_PGM_SYNC_CR3_NON_GLOBAL)) #if 1 rc = PGMSyncCR3(pVM, CPUMGetGuestCR0(pVM), CPUMGetGuestCR3(pVM), CPUMGetGuestCR4(pVM), VM_FF_ISSET(pVM, VM_FF_PGM_SYNC_CR3)); #else rc = VINF_PGM_SYNC_CR3; #endif /* Pending request packets might contain actions that need immediate attention, such as pending hardware interrupts. */ else if (VM_FF_ISPENDING(pVM, VM_FF_REQUEST)) rc = VINF_EM_PENDING_REQUEST; } AssertMsg( rc != VINF_SUCCESS || ( pRegFrame->eflags.Bits.u1IF && ( pRegFrame->eflags.Bits.u2IOPL < (unsigned)(pRegFrame->ss & X86_SEL_RPL) || pRegFrame->eflags.Bits.u1VM)) , ("rc = %VGv\neflags=%RX32 ss=%RTsel IOPL=%d\n", rc, pRegFrame->eflags.u32, pRegFrame->ss, pRegFrame->eflags.Bits.u2IOPL)); return rc; } /** * \#DB (Debug event) handler. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap01Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { RTGCUINTREG uDr6 = ASMGetAndClearDR6(); PVM pVM = TRPM2VM(pTrpm); LogFlow(("TRPMGCTrap01Handler: cs:eip=%04x:%08x uDr6=%RTreg\n", pRegFrame->cs, pRegFrame->eip, uDr6)); /* * We currently don't make sure of the X86_DR7_GD bit, but * there might come a time when we do. */ if ((uDr6 & X86_DR6_BD) == X86_DR6_BD) { AssertReleaseMsgFailed(("X86_DR6_BD isn't used, but it's set! dr7=%RTreg(%RTreg) dr6=%RTreg\n", ASMGetDR7(), CPUMGetHyperDR7(pVM), uDr6)); return VERR_NOT_IMPLEMENTED; } AssertReleaseMsg(!(uDr6 & X86_DR6_BT), ("X86_DR6_BT is impossible!\n")); /* * Now leave the rest to the DBGF. */ int rc = DBGFGCTrap01Handler(pVM, pRegFrame, uDr6); if (rc == VINF_EM_RAW_GUEST_TRAP) CPUMSetGuestDR6(pVM, uDr6); return trpmGCExitTrap(pVM, rc, pRegFrame); } /** * NMI handler, for when we are using NMIs to debug things. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal * @remark This is not hooked up unless you're building with VBOX_WITH_NMI defined. */ DECLASM(int) TRPMGCTrap02Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { LogFlow(("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip)); RTLogComPrintf("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip); return VERR_TRPM_DONT_PANIC; } /** * \#BP (Breakpoint) handler. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap03Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { LogFlow(("TRPMGCTrap03Handler: cs:eip=%04x:%08x\n", pRegFrame->cs, pRegFrame->eip)); PVM pVM = TRPM2VM(pTrpm); int rc; /* * Both PATM are using INT3s, let them have a go first. */ if ( (pRegFrame->ss & X86_SEL_RPL) == 1 && !pRegFrame->eflags.Bits.u1VM) { rc = PATMHandleInt3PatchTrap(pVM, pRegFrame); if (rc == VINF_SUCCESS || rc == VINF_EM_RAW_EMULATE_INSTR || rc == VINF_PATM_PATCH_INT3 || rc == VINF_PATM_DUPLICATE_FUNCTION) return trpmGCExitTrap(pVM, rc, pRegFrame); } rc = DBGFGCTrap03Handler(pVM, pRegFrame); /* anything we should do with this? Schedule it in GC? */ return trpmGCExitTrap(pVM, rc, pRegFrame); } /** * Trap handler for illegal opcode fault (\#UD). * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap06Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPM2VM(pTrpm); LogFlow(("TRPMGCTrap06Handler %VGv eflags=%x\n", pRegFrame->eip, pRegFrame->eflags.u32)); if ( (pRegFrame->ss & X86_SEL_RPL) == 1 && !pRegFrame->eflags.Bits.u1VM && PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)) { /* * Decode the instruction. */ RTGCPTR PC; int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC); if (VBOX_FAILURE(rc)) { Log(("TRPMGCTrap06Handler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n", pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc)); return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame); } DISCPUSTATE Cpu; uint32_t cbOp; rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp); if (VBOX_FAILURE(rc)) return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); /** @note monitor causes an #UD exception instead of #GP when not executed in ring 0. */ if (Cpu.pCurInstr->opcode == OP_ILLUD2) { int rc = PATMGCHandleIllegalInstrTrap(pVM, pRegFrame); if (rc == VINF_SUCCESS || rc == VINF_EM_RAW_EMULATE_INSTR || rc == VINF_PATM_DUPLICATE_FUNCTION || rc == VINF_PATM_PENDING_IRQ_AFTER_IRET || rc == VINF_EM_RESCHEDULE) return trpmGCExitTrap(pVM, rc, pRegFrame); } } else if (pRegFrame->eflags.Bits.u1VM) { int rc = TRPMForwardTrap(pVM, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP); Assert(rc == VINF_EM_RAW_GUEST_TRAP); } return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame); } /** * Trap handler for device not present fault (\#NM). * * Device not available, FP or (F)WAIT instruction. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap07Handler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPM2VM(pTrpm); LogFlow(("TRPMTrap07HandlerGC: eip=%VGv\n", pRegFrame->eip)); return CPUMHandleLazyFPU(pVM); } /** * \#NP ((segment) Not Present) handler. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { LogFlow(("TRPMGCTrap0bHandler: eip=%VGv\n", pRegFrame->eip)); PVM pVM = TRPM2VM(pTrpm); /* * Try to detect instruction by opcode which caused trap. * XXX note: this code may cause \#PF (trap e) or \#GP (trap d) while * accessing user code. need to handle it somehow in future! */ uint8_t *pu8Code; if (SELMValidateAndConvertCSAddr(pVM, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, (PRTGCPTR)&pu8Code) == VINF_SUCCESS) { /* * First skip possible instruction prefixes, such as: * OS, AS * CS:, DS:, ES:, SS:, FS:, GS: * REPE, REPNE * * note: Currently we supports only up to 4 prefixes per opcode, more * prefixes (normally not used anyway) will cause trap d in guest. * note: Instruction length in IA-32 may be up to 15 bytes, we dont * check this issue, its too hard. */ for (unsigned i = 0; i < 4; i++) { if ( pu8Code[0] != 0xf2 /* REPNE/REPNZ */ && pu8Code[0] != 0xf3 /* REP/REPE/REPZ */ && pu8Code[0] != 0x2e /* CS: */ && pu8Code[0] != 0x36 /* SS: */ && pu8Code[0] != 0x3e /* DS: */ && pu8Code[0] != 0x26 /* ES: */ && pu8Code[0] != 0x64 /* FS: */ && pu8Code[0] != 0x65 /* GS: */ && pu8Code[0] != 0x66 /* OS */ && pu8Code[0] != 0x67 /* AS */ ) break; pu8Code++; } /* * Detect right switch using a callgate. * * We recognize the following causes for the trap 0b: * CALL FAR, CALL FAR [] * JMP FAR, JMP FAR [] * IRET (may cause a task switch) * * Note: we can't detect whether the trap was caused by a call to a * callgate descriptor or it is a real trap 0b due to a bad selector. * In both situations we'll pass execution to our recompiler so we don't * have to worry. * If we wanted to do better detection, we have set GDT entries to callgate * descriptors pointing to our own handlers. */ /** @todo not sure about IRET, may generate Trap 0d (\#GP), NEED TO CHECK! */ if ( pu8Code[0] == 0x9a /* CALL FAR */ || ( pu8Code[0] == 0xff /* CALL FAR [] */ && (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x18) || pu8Code[0] == 0xea /* JMP FAR */ || ( pu8Code[0] == 0xff /* JMP FAR [] */ && (pu8Code[1] & X86_OPCODE_MODRM_REG_MASK) == 0x28) || pu8Code[0] == 0xcf /* IRET */ ) { /* * Got potential call to callgate. * We simply return execution to the recompiler to do emulation * starting from the instruction which caused the trap. */ pTrpm->uActiveVector = ~0; return VINF_EM_RAW_RING_SWITCH; } } /* * Pass trap 0b as is to the recompiler in all other cases. */ return VINF_EM_RAW_GUEST_TRAP; } /** * \#GP (General Protection Fault) handler for Ring-0 privileged instructions. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pVM The VM handle. * @param pRegFrame Pointer to the register frame for the trap. * @param pCpu The opcode info. * @param PC Program counter. */ static int trpmGCTrap0dHandlerRing0(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC) { int rc; /* * Try handle it here, if not return to HC and emulate/interpret it there. */ switch (pCpu->pCurInstr->opcode) { case OP_INT3: /* * Little hack to make the code below not fail */ pCpu->param1.flags = USE_IMMEDIATE8; pCpu->param1.parval = 3; /* fallthru */ case OP_INT: { Assert(pCpu->param1.flags & USE_IMMEDIATE8); Assert(!(PATMIsPatchGCAddr(pVM, PC))); if (pCpu->param1.parval == 3) { /* Obsolete!! */ /* Int 3 replacement patch? */ if (PATMHandleInt3PatchTrap(pVM, pRegFrame) == VINF_SUCCESS) { AssertFailed(); return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame); } } rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT); if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP) return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame); pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT; pVM->trpm.s.fActiveSoftwareInterrupt = true; return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame); } #ifdef PATM_EMULATE_SYSENTER case OP_SYSEXIT: case OP_SYSRET: rc = PATMSysCall(pVM, pRegFrame, pCpu); return trpmGCExitTrap(pVM, rc, pRegFrame); #endif case OP_HLT: /* If it's in patch code, defer to ring-3. */ if (PATMIsPatchGCAddr(pVM, PC)) break; pRegFrame->eip += pCpu->opsize; return trpmGCExitTrap(pVM, VINF_EM_HALT, pRegFrame); /* * These instructions are used by PATM and CASM for finding * dangerous non-trapping instructions. Thus, since all * scanning and patching is done in ring-3 we'll have to * return to ring-3 on the first encounter of these instructions. */ case OP_MOV_CR: case OP_MOV_DR: /* We can safely emulate control/debug register move instructions in patched code. */ if ( !PATMIsPatchGCAddr(pVM, PC) && !CSAMIsKnownDangerousInstr(pVM, PC)) break; case OP_INVLPG: case OP_LLDT: case OP_STI: case OP_RDTSC: { uint32_t cbIgnored; rc = EMInterpretInstructionCPU(pVM, pCpu, pRegFrame, PC, &cbIgnored); if (VBOX_SUCCESS(rc)) pRegFrame->eip += pCpu->opsize; else if (rc == VERR_EM_INTERPRETER) rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED; return trpmGCExitTrap(pVM, rc, pRegFrame); } } return trpmGCExitTrap(pVM, VINF_EM_RAW_EXCEPTION_PRIVILEGED, pRegFrame); } /** * \#GP (General Protection Fault) handler for Ring-3. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pVM The VM handle. * @param pRegFrame Pointer to the register frame for the trap. * @param pCpu The opcode info. */ static int trpmGCTrap0dHandlerRing3(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu) { int rc; switch (pCpu->pCurInstr->opcode) { /* * STI and CLI are I/O privileged, i.e. if IOPL */ case OP_STI: case OP_CLI: { uint32_t efl = CPUMRawGetEFlags(pVM, pRegFrame); if (X86_EFL_GET_IOPL(efl) >= (unsigned)(pRegFrame->ss & X86_SEL_RPL)) { LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> REM\n")); return trpmGCExitTrap(pVM, VINF_EM_RESCHEDULE_REM, pRegFrame); } LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> #GP(0)\n")); break; } /* * INT3 and INT xx are ring-switching. * (The shadow IDT will have set the entries to DPL=0, that's why we're here.) */ case OP_INT3: /* * Little hack to make the code below not fail */ pCpu->param1.flags = USE_IMMEDIATE8; pCpu->param1.parval = 3; /* fall thru */ case OP_INT: { Assert(pCpu->param1.flags & USE_IMMEDIATE8); rc = TRPMForwardTrap(pVM, pRegFrame, (uint32_t)pCpu->param1.parval, pCpu->opsize, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT); if (VBOX_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP) return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame); pVM->trpm.s.uActiveVector = (pVM->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT; pVM->trpm.s.fActiveSoftwareInterrupt = true; return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame); } /* * SYSCALL, SYSENTER, INTO and BOUND are also ring-switchers. */ case OP_SYSCALL: case OP_SYSENTER: #ifdef PATM_EMULATE_SYSENTER rc = PATMSysCall(pVM, pRegFrame, pCpu); if (rc == VINF_SUCCESS) return trpmGCExitTrap(pVM, VINF_SUCCESS, pRegFrame); /* else no break; */ #endif case OP_BOUND: case OP_INTO: pVM->trpm.s.uActiveVector = ~0; return trpmGCExitTrap(pVM, VINF_EM_RAW_RING_SWITCH, pRegFrame); } /* * A genuine guest fault. */ return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame); } /** * \#GP (General Protection Fault) handler. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pVM The VM handle. * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. */ static int trpmGCTrap0dHandler(PVM pVM, PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { LogFlow(("trpmGCTrap0dHandler: cs:eip=%RTsel:%VGv uErr=%RX32\n", pRegFrame->ss, pRegFrame->eip, pTrpm->uActiveErrorCode)); #if 0 /* not right for iret. Shouldn't really be needed as SELMValidateAndConvertCSAddr deals with invalid cs. */ /* * Filter out selector problems first as these may mean that the * instruction isn't safe to read. If we're here because CS is NIL * the flattening of cs:eip will deal with that. */ if ( !(pTrpm->uActiveErrorCode & (X86_TRAP_ERR_IDT | X86_TRAP_ERR_EXTERNAL)) && (pTrpm->uActiveErrorCode & X86_TRAP_ERR_SEL_MASK)) { /* It's a guest trap. */ return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame); } #endif /* We always set IOPL to zero which makes e.g. pushf fault in V86 mode. The guest might use IOPL=3 and therefor not expect a #GP. * Simply fall back to the recompiler to emulate this instruction. */ if (pRegFrame->eflags.Bits.u1VM) { /* Retrieve the eflags including the virtualized bits. */ /** @note hackish as the cpumctxcore structure doesn't contain the right value */ X86EFLAGS eflags; eflags.u32 = CPUMRawGetEFlags(pVM, pRegFrame); if (eflags.Bits.u2IOPL == 0) { int rc = TRPMForwardTrap(pVM, pRegFrame, 0xD, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP); Assert(rc == VINF_EM_RAW_GUEST_TRAP); return trpmGCExitTrap(pVM, rc, pRegFrame); } return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); } STAM_PROFILE_ADV_START(&pVM->trpm.s.StatTrap0dDisasm, a); /* * Decode the instruction. */ RTGCPTR PC; int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid, (RTGCPTR)pRegFrame->eip, &PC); if (VBOX_FAILURE(rc)) { Log(("trpmGCTrap0dHandler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Vrc !!\n", pRegFrame->cs, pRegFrame->eip, pRegFrame->ss & X86_SEL_RPL, rc)); STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a); return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); } DISCPUSTATE Cpu; uint32_t cbOp; rc = EMInterpretDisasOneEx(pVM, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp); if (VBOX_FAILURE(rc)) { STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a); return trpmGCExitTrap(pVM, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); } STAM_PROFILE_ADV_STOP(&pVM->trpm.s.StatTrap0dDisasm, a); /* * Deal with I/O port access. */ if ( pVM->trpm.s.uActiveErrorCode == 0 && (Cpu.pCurInstr->optype & OPTYPE_PORTIO)) { rc = EMInterpretPortIO(pVM, pRegFrame, &Cpu, cbOp); return trpmGCExitTrap(pVM, rc, pRegFrame); } /* * Deal with Ring-0 (privileged instructions) */ if ( (pRegFrame->ss & X86_SEL_RPL) <= 1 && !pRegFrame->eflags.Bits.u1VM) return trpmGCTrap0dHandlerRing0(pVM, pRegFrame, &Cpu, PC); /* * Deal with Ring-3 GPs. */ if (!pRegFrame->eflags.Bits.u1VM) return trpmGCTrap0dHandlerRing3(pVM, pRegFrame, &Cpu); /** @todo what about V86 mode? */ return trpmGCExitTrap(pVM, VINF_EM_RAW_GUEST_TRAP, pRegFrame); } /** * \#GP (General Protection Fault) handler. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { LogFlow(("TRPMGCTrap0dHandler: eip=%RGv\n", pRegFrame->eip)); PVM pVM = TRPM2VM(pTrpm); int rc = trpmGCTrap0dHandler(pVM, pTrpm, pRegFrame); switch (rc) { case VINF_EM_RAW_GUEST_TRAP: case VINF_EM_RAW_EXCEPTION_PRIVILEGED: if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)) rc = VINF_PATM_PATCH_TRAP_GP; break; case VINF_EM_RAW_INTERRUPT_PENDING: Assert(TRPMHasTrap(pVM)); /* no break; */ case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */ case VINF_IOM_HC_IOPORT_READWRITE: case VINF_IOM_HC_IOPORT_READ: case VINF_IOM_HC_IOPORT_WRITE: case VINF_IOM_HC_MMIO_WRITE: case VINF_IOM_HC_MMIO_READ: case VINF_IOM_HC_MMIO_READ_WRITE: case VINF_PATM_PATCH_INT3: case VINF_EM_RAW_TO_R3: case VINF_EM_RAW_TIMER_PENDING: case VINF_EM_PENDING_REQUEST: case VINF_EM_HALT: case VINF_SUCCESS: break; default: AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("return code %d\n", rc)); break; } return rc; } /** * \#PF (Page Fault) handler. * * Calls PGM which does the actual handling. * * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { LogBird(("TRPMGCTrap0eHandler: eip=%RGv\n", pRegFrame->eip)); PVM pVM = TRPM2VM(pTrpm); /* * This is all PGM stuff. */ int rc = PGMTrap0eHandler(pVM, pTrpm->uActiveErrorCode, pRegFrame, (RTGCPTR)pTrpm->uActiveCR2); switch (rc) { case VINF_EM_RAW_EMULATE_INSTR: case VINF_EM_RAW_EMULATE_INSTR_PD_FAULT: case VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT: case VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT: case VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT: case VINF_EM_RAW_EMULATE_INSTR_IDT_FAULT: if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)) rc = VINF_PATCH_EMULATE_INSTR; break; case VINF_EM_RAW_GUEST_TRAP: if (PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip)) return VINF_PATM_PATCH_TRAP_PF; rc = TRPMForwardTrap(pVM, pRegFrame, 0xE, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP); Assert(rc == VINF_EM_RAW_GUEST_TRAP); break; case VINF_EM_RAW_INTERRUPT_PENDING: Assert(TRPMHasTrap(pVM)); /* no break; */ case VINF_IOM_HC_MMIO_READ: case VINF_IOM_HC_MMIO_WRITE: case VINF_IOM_HC_MMIO_READ_WRITE: case VINF_PATM_HC_MMIO_PATCH_READ: case VINF_PATM_HC_MMIO_PATCH_WRITE: case VINF_SUCCESS: case VINF_EM_RAW_TO_R3: case VINF_EM_PENDING_REQUEST: case VINF_EM_RAW_TIMER_PENDING: case VINF_CSAM_PENDING_ACTION: case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */ break; default: AssertMsg(PATMIsPatchGCAddr(pVM, (RTGCPTR)pRegFrame->eip) == false, ("Patch address for return code %d. eip=%08x\n", rc, pRegFrame->eip)); break; } return trpmGCExitTrap(pVM, rc, pRegFrame); } /** * Scans for the EIP in the specified array of trap handlers. * * If we don't fine the EIP, we'll panic. * * @returns VBox status code. * * @param pVM The VM handle. * @param pRegFrame Pointer to the register frame for the trap. * @param paHandlers The array of trap handler records. * @param pEndRecord The end record (exclusive). */ static int trpmGCHyperGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, PCTRPMGCHYPER paHandlers, PCTRPMGCHYPER pEndRecord) { uintptr_t uEip = (uintptr_t)pRegFrame->eip; Assert(paHandlers <= pEndRecord); Log(("trpmGCHyperGeneric: uEip=%x %p-%p\n", uEip, paHandlers, pEndRecord)); #if 0 /// @todo later /* * Start by doing a kind of binary search. */ unsigned iStart = 0; unsigned iEnd = pEndRecord - paHandlers; unsigned i = iEnd / 2; #endif /* * Do a linear search now (in case the array wasn't properly sorted). */ for (PCTRPMGCHYPER pCur = paHandlers; pCur < pEndRecord; pCur++) { if ( pCur->uStartEIP <= uEip && (pCur->uEndEIP ? pCur->uEndEIP > uEip : pCur->uStartEIP == uEip)) return pCur->pfnHandler(pVM, pRegFrame, pCur->uUser); } return VERR_TRPM_DONT_PANIC; } /** * Hypervisor \#NP ((segment) Not Present) handler. * * Scans for the EIP in the registered trap handlers. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed back to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap0bHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0bHandlers, g_aTrap0bHandlersEnd); } /** * Hypervisor \#GP (General Protection Fault) handler. * * Scans for the EIP in the registered trap handlers. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed back to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap0dHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd); } /** * Hypervisor \#PF (Page Fault) handler. * * Scans for the EIP in the registered trap handlers. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed back to host context. * * @param pTrpm Pointer to TRPM data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap0eHandler(PTRPM pTrpm, PCPUMCTXCORE pRegFrame) { return trpmGCHyperGeneric(TRPM2VM(pTrpm), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd); } /** * Deal with hypervisor traps occuring when resuming execution on a trap. * * @returns VBox status code. * @param pVM The VM handle. * @param pRegFrame Register frame. * @param uUser User arg. */ DECLCALLBACK(int) trpmGCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser) { Log(("trpmGCTrapInGeneric: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser)); if (uUser & TRPM_TRAP_IN_HYPER) { /* * Check that there is still some stack left, if not we'll flag * a guru meditation (the alternative is a triple fault). */ RTGCUINTPTR cbStackUsed = (RTGCUINTPTR)VMMGetStackGC(pVM) - pRegFrame->esp; if (cbStackUsed > VMM_STACK_SIZE - _1K) { LogRel(("trpmGCTrapInGeneric: ran out of stack: esp=#x cbStackUsed=%#x\n", pRegFrame->esp, cbStackUsed)); return VERR_TRPM_DONT_PANIC; } /* * Just zero the register containing the selector in question. * We'll deal with the actual stale or troublesome selector value in * the outermost trap frame. */ switch (uUser & TRPM_TRAP_IN_OP_MASK) { case TRPM_TRAP_IN_MOV_GS: pRegFrame->eax = 0; pRegFrame->gs = 0; /* prevent recursive trouble. */ break; case TRPM_TRAP_IN_MOV_FS: pRegFrame->eax = 0; pRegFrame->fs = 0; /* prevent recursive trouble. */ return VINF_SUCCESS; default: AssertMsgFailed(("Invalid uUser=%#x\n", uUser)); return VERR_INTERNAL_ERROR; } } else { /* * Reconstruct the guest context and switch to the recompiler. * We ASSUME we're only at */ CPUMCTXCORE CtxCore = *pRegFrame; uint32_t *pEsp = (uint32_t *)pRegFrame->esp; int rc; switch (uUser) { /* * This will only occur when resuming guest code in a trap handler! */ /* @note ASSUMES esp points to the temporary guest CPUMCTXCORE!!! */ case TRPM_TRAP_IN_MOV_GS: case TRPM_TRAP_IN_MOV_FS: case TRPM_TRAP_IN_MOV_ES: case TRPM_TRAP_IN_MOV_DS: { PCPUMCTXCORE pTempGuestCtx = (PCPUMCTXCORE)pEsp; /* Just copy the whole thing; several selector registers, eip (etc) and eax are not yet in pRegFrame. */ CtxCore = *pTempGuestCtx; rc = VINF_EM_RAW_STALE_SELECTOR; break; } /* * This will only occur when resuming guest code! */ case TRPM_TRAP_IN_IRET: CtxCore.eip = *pEsp++; CtxCore.cs = (RTSEL)*pEsp++; CtxCore.eflags.u32 = *pEsp++; CtxCore.esp = *pEsp++; CtxCore.ss = (RTSEL)*pEsp++; rc = VINF_EM_RAW_IRET_TRAP; break; /* * This will only occur when resuming V86 guest code! */ case TRPM_TRAP_IN_IRET | TRPM_TRAP_IN_V86: CtxCore.eip = *pEsp++; CtxCore.cs = (RTSEL)*pEsp++; CtxCore.eflags.u32 = *pEsp++; CtxCore.esp = *pEsp++; CtxCore.ss = (RTSEL)*pEsp++; CtxCore.es = (RTSEL)*pEsp++; CtxCore.ds = (RTSEL)*pEsp++; CtxCore.fs = (RTSEL)*pEsp++; CtxCore.gs = (RTSEL)*pEsp++; rc = VINF_EM_RAW_IRET_TRAP; break; default: AssertMsgFailed(("Invalid uUser=%#x\n", uUser)); return VERR_INTERNAL_ERROR; } CPUMSetGuestCtxCore(pVM, &CtxCore); TRPMGCHyperReturnToHost(pVM, rc); } AssertMsgFailed(("Impossible!\n")); return VERR_INTERNAL_ERROR; }