/* $Id: TRPMRCHandlers.cpp 45485 2013-04-11 14:46:04Z vboxsync $ */ /** @file * TRPM - Raw-mode Context Trap Handlers, CPP part */ /* * Copyright (C) 2006-2013 Oracle Corporation * * 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 (GPL) 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. */ /******************************************************************************* * 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 #include #include /******************************************************************************* * Defined Constants And Macros * *******************************************************************************/ /* 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 /** @todo fix/remove/permanent-enable this when DIS/PATM handles invalid lock sequences. */ #define DTRACE_EXPERIMENT #if 1 # define TRPM_ENTER_DBG_HOOK(a_iVector) do {} while (0) # define TRPM_EXIT_DBG_HOOK(a_iVector) do {} while (0) # define TRPM_ENTER_DBG_HOOK_HYPER(a_iVector) do {} while (0) # define TRPM_EXIT_DBG_HOOK_HYPER(a_iVector) do {} while (0) #else # define TRPM_ENTER_DBG_HOOK(a_iVector) \ uint32_t const fDbgEFlags1 = CPUMRawGetEFlags(pVCpu); \ if (!(fDbgEFlags1 & X86_EFL_IF)) Log(("%s: IF=0 ##\n", __FUNCTION__)); \ else do {} while(0) # define TRPM_EXIT_DBG_HOOK(a_iVector) \ do { \ uint32_t const fDbgEFlags2 = CPUMRawGetEFlags(pVCpu); \ if ((fDbgEFlags1 ^ fDbgEFlags2) & (X86_EFL_IF | X86_EFL_IOPL)) \ Log(("%s: IF=%d->%d IOPL=%d->%d !#\n", __FUNCTION__, \ !!(fDbgEFlags1 & X86_EFL_IF), !!(fDbgEFlags2 & X86_EFL_IF), \ X86_EFL_GET_IOPL(fDbgEFlags1), X86_EFL_GET_IOPL(fDbgEFlags2) )); \ else if (!(fDbgEFlags2 & X86_EFL_IF)) Log(("%s: IF=0 [ret] ##\n", __FUNCTION__)); \ } while (0) # define TRPM_ENTER_DBG_HOOK_HYPER(a_iVector) do {} while (0) # define TRPM_EXIT_DBG_HOOK_HYPER(a_iVector) do {} while (0) #endif /******************************************************************************* * Structures and Typedefs * *******************************************************************************/ /** 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 Pointer to the VM. * @param pRegFrame The register frame. * @param uUser The user argument. */ DECLRCCALLBACKMEMBER(int, pfnHandler, (PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser)); /** Whatever the handler desires to put here. */ uintptr_t uUser; } TRPMGCHYPER; /******************************************************************************* * Global Variables * *******************************************************************************/ RT_C_DECLS_BEGIN /** 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]; /** @} */ RT_C_DECLS_END /******************************************************************************* * Internal Functions * *******************************************************************************/ RT_C_DECLS_BEGIN /* addressed from asm (not called so no DECLASM). */ DECLCALLBACK(int) trpmRCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser); RT_C_DECLS_END /** * 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, can be adjusted if its VINF_SUCCESS or something really bad * happened. * @param pVM Pointer to the VM. * @param pVCpu Pointer to the VMCPU. * @param rc The VBox status code to return. * @param pRegFrame Pointer to the register frame for the trap. * * @remarks This must not be used for hypervisor traps, only guest traps. */ static int trpmGCExitTrap(PVM pVM, PVMCPU pVCpu, int rc, PCPUMCTXCORE pRegFrame) { uint32_t uOldActiveVector = pVCpu->trpm.s.uActiveVector; NOREF(uOldActiveVector); /* Reset trap? */ if ( rc != VINF_EM_RAW_GUEST_TRAP && rc != VINF_EM_RAW_RING_SWITCH_INT) pVCpu->trpm.s.uActiveVector = UINT32_MAX; #ifdef VBOX_HIGH_RES_TIMERS_HACK /* * We should poll the timers occasionally. * 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 @bugref{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)) { TMTimerPollVoid(pVM, pVCpu); Log2(("TMTimerPoll at %08RX32 - VM_FF_TM_VIRTUAL_SYNC=%d VM_FF_TM_VIRTUAL_SYNC=%d\n", pRegFrame->eip, VM_FF_ISPENDING(pVM, VM_FF_TM_VIRTUAL_SYNC), VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TIMER))); } } else s_iTimerPoll = 0; #endif /* Clear pending inhibit interrupt state if required. (necessary for dispatching interrupts later on) */ if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS)) { Log2(("VM_FF_INHIBIT_INTERRUPTS at %08RX32 successor %RGv\n", pRegFrame->eip, EMGetInhibitInterruptsPC(pVCpu))); if (pRegFrame->eip != EMGetInhibitInterruptsPC(pVCpu)) { /** @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. */ VMCPU_FF_CLEAR(pVCpu, VMCPU_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_TM_VIRTUAL_SYNC | VM_FF_REQUEST | VM_FF_PGM_NO_MEMORY | VM_FF_PDM_DMA) || VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TIMER | VMCPU_FF_TO_R3 | VMCPU_FF_INTERRUPT_APIC | VMCPU_FF_INTERRUPT_PIC | VMCPU_FF_REQUEST | VMCPU_FF_PGM_SYNC_CR3 | VMCPU_FF_PGM_SYNC_CR3_NON_GLOBAL | VMCPU_FF_PDM_CRITSECT | VMCPU_FF_SELM_SYNC_GDT | VMCPU_FF_SELM_SYNC_LDT | VMCPU_FF_SELM_SYNC_TSS ) ) ) { /* The out of memory condition naturally outranks the others. */ if (RT_UNLIKELY(VM_FF_ISPENDING(pVM, VM_FF_PGM_NO_MEMORY))) rc = VINF_EM_NO_MEMORY; /* Pending Ring-3 action. */ else if (VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TO_R3 | VMCPU_FF_PDM_CRITSECT)) { VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_TO_R3); rc = VINF_EM_RAW_TO_R3; } /* Pending timer action. */ else if (VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_TIMER)) rc = VINF_EM_RAW_TIMER_PENDING; /* The Virtual Sync clock has stopped. */ else if (VM_FF_ISPENDING(pVM, VM_FF_TM_VIRTUAL_SYNC)) rc = VINF_EM_RAW_TO_R3; /* DMA work pending? */ else if (VM_FF_ISPENDING(pVM, VM_FF_PDM_DMA)) rc = VINF_EM_RAW_TO_R3; /* Pending request packets might contain actions that need immediate attention, such as pending hardware interrupts. */ else if ( VM_FF_ISPENDING(pVM, VM_FF_REQUEST) || VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_REQUEST)) rc = VINF_EM_PENDING_REQUEST; /* Pending GDT/LDT/TSS sync. */ else if (VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_SELM_SYNC_GDT | VMCPU_FF_SELM_SYNC_LDT | VMCPU_FF_SELM_SYNC_TSS)) rc = VINF_SELM_SYNC_GDT; /* Pending interrupt: dispatch it. */ else if ( VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_INTERRUPT_APIC | VMCPU_FF_INTERRUPT_PIC) && !VMCPU_FF_ISSET(pVCpu, VMCPU_FF_INHIBIT_INTERRUPTS) && PATMAreInterruptsEnabledByCtxCore(pVM, pRegFrame) ) { uint8_t u8Interrupt; rc = PDMGetInterrupt(pVCpu, &u8Interrupt); Log(("trpmGCExitTrap: u8Interrupt=%d (%#x) rc=%Rrc\n", u8Interrupt, u8Interrupt, rc)); AssertFatalMsgRC(rc, ("PDMGetInterrupt failed with %Rrc\n", rc)); rc = TRPMForwardTrap(pVCpu, pRegFrame, (uint32_t)u8Interrupt, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_HARDWARE_INT, uOldActiveVector); /* 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(pVCpu, u8Interrupt, TRPM_HARDWARE_INT); STAM_PROFILE_ADV_START(&pVM->trpm.s.aStatGCTraps[uOldActiveVector], a); rc = VINF_EM_RAW_INTERRUPT_PENDING; } /* * Try sync CR3? */ else if (VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_PGM_SYNC_CR3 | VMCPU_FF_PGM_SYNC_CR3_NON_GLOBAL)) { #if 1 PGMRZDynMapReleaseAutoSet(pVCpu); PGMRZDynMapStartAutoSet(pVCpu); rc = PGMSyncCR3(pVCpu, CPUMGetGuestCR0(pVCpu), CPUMGetGuestCR3(pVCpu), CPUMGetGuestCR4(pVCpu), VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)); #else rc = VINF_PGM_SYNC_CR3; #endif } } /* Note! TRPMRCHandlersA.asm performs sanity checks in debug builds.*/ PGMRZDynMapReleaseAutoSet(pVCpu); 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap01Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { RTGCUINTREG uDr6 = ASMGetAndClearDR6(); PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); LogFlow(("TRPMGC01: cs:eip=%04x:%08x uDr6=%RTreg EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, uDr6, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(1); /* * We currently don't make use of the X86_DR7_GD bit, but * there might come a time when we do. */ AssertReleaseMsgReturn((uDr6 & X86_DR6_BD) != X86_DR6_BD, ("X86_DR6_BD isn't used, but it's set! dr7=%RTreg(%RTreg) dr6=%RTreg\n", ASMGetDR7(), CPUMGetHyperDR7(pVCpu), uDr6), VERR_NOT_IMPLEMENTED); AssertReleaseMsg(!(uDr6 & X86_DR6_BT), ("X86_DR6_BT is impossible!\n")); /* * Now leave the rest to the DBGF. */ PGMRZDynMapStartAutoSet(pVCpu); int rc = DBGFRZTrap01Handler(pVM, pVCpu, pRegFrame, uDr6); if (rc == VINF_EM_RAW_GUEST_TRAP) CPUMSetGuestDR6(pVCpu, uDr6); rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); Log6(("TRPMGC01: %Rrc (%04x:%08x %RTreg %EFlag=%#x)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, uDr6, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(1); return rc; } /** * \#DB (Debug event) handler for the hypervisor code. * * This is mostly the same as TRPMGCTrap01Handler, but we skip the PGM auto * mapping set as well as the default trap exit path since they are both really * bad ideas in this context. * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap01Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { RTGCUINTREG uDr6 = ASMGetAndClearDR6(); PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); TRPM_ENTER_DBG_HOOK_HYPER(1); LogFlow(("TRPMGCHyper01: cs:eip=%04x:%08x uDr6=%RTreg\n", pRegFrame->cs.Sel, pRegFrame->eip, uDr6)); /* * We currently don't make use of the X86_DR7_GD bit, but * there might come a time when we do. */ AssertReleaseMsgReturn((uDr6 & X86_DR6_BD) != X86_DR6_BD, ("X86_DR6_BD isn't used, but it's set! dr7=%RTreg(%RTreg) dr6=%RTreg\n", ASMGetDR7(), CPUMGetHyperDR7(pVCpu), uDr6), VERR_NOT_IMPLEMENTED); AssertReleaseMsg(!(uDr6 & X86_DR6_BT), ("X86_DR6_BT is impossible!\n")); /* * Now leave the rest to the DBGF. */ int rc = DBGFRZTrap01Handler(pVM, pVCpu, pRegFrame, uDr6); AssertStmt(rc != VINF_EM_RAW_GUEST_TRAP, rc = VERR_TRPM_IPE_1); Log6(("TRPMGCHyper01: %Rrc (%04x:%08x %RTreg)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, uDr6)); TRPM_EXIT_DBG_HOOK_HYPER(1); return rc; } /** * 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 pTrpmCpu Pointer to TRPMCPU 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(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { LogFlow(("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs.Sel, pRegFrame->eip)); RTLogComPrintf("TRPMGCTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs.Sel, pRegFrame->eip); NOREF(pTrpmCpu); return VERR_TRPM_DONT_PANIC; } /** * NMI handler, for when we are using NMIs to debug things. * * This is the handler we're most likely to hit when the NMI fires (it is * unlikely that we'll be stuck in guest code). * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpmCpu Pointer to TRPMCPU 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) TRPMGCHyperTrap02Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { LogFlow(("TRPMGCHyperTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs.Sel, pRegFrame->eip)); RTLogComPrintf("TRPMGCHyperTrap02Handler: cs:eip=%04x:%08x\n", pRegFrame->cs.Sel, pRegFrame->eip); NOREF(pTrpmCpu); 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap03Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); int rc; LogFlow(("TRPMGC03: %04x:%08x EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(3); PGMRZDynMapStartAutoSet(pVCpu); /* * PATM is using INT3s, let them have a go first. */ if ( ( (pRegFrame->ss.Sel & X86_SEL_RPL) == 1 || (EMIsRawRing1Enabled(pVM) && (pRegFrame->ss.Sel & X86_SEL_RPL) == 2) ) && !pRegFrame->eflags.Bits.u1VM) { rc = PATMRCHandleInt3PatchTrap(pVM, pRegFrame); if ( rc == VINF_SUCCESS || rc == VINF_EM_RAW_EMULATE_INSTR || rc == VINF_PATM_PATCH_INT3 || rc == VINF_PATM_DUPLICATE_FUNCTION) { rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); Log6(("TRPMGC03: %Rrc (%04x:%08x EFL=%x) (PATM)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(3); return rc; } } rc = DBGFRZTrap03Handler(pVM, pVCpu, pRegFrame); /* anything we should do with this? Schedule it in GC? */ rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); Log6(("TRPMGC03: %Rrc (%04x:%08x EFL=%x)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(3); return rc; } /** * \#BP (Breakpoint) handler. * * This is similar to TRPMGCTrap03Handler but we bits which are potentially * harmful to us (common trap exit and the auto mapping set). * * @returns VBox status code. * VINF_SUCCESS means we completely handled this trap, * other codes are passed execution to host context. * * @param pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap03Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); LogFlow(("TRPMGCHyper03: %04x:%08x EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK_HYPER(3); /* * Hand it over to DBGF. */ int rc = DBGFRZTrap03Handler(pVM, pVCpu, pRegFrame); AssertStmt(rc != VINF_EM_RAW_GUEST_TRAP, rc = VERR_TRPM_IPE_2); Log6(("TRPMGCHyper03: %Rrc (%04x:%08x EFL=%x)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK_HYPER(3); return rc; } /** * 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap06Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); int rc; LogFlow(("TRPMGC06: %04x:%08x EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, pRegFrame->eflags.u32, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(6); PGMRZDynMapStartAutoSet(pVCpu); if (CPUMGetGuestCPL(pVCpu) <= (EMIsRawRing1Enabled(pVM) ? 1U : 0U)) { /* * Decode the instruction. */ RTGCPTR PC; rc = SELMValidateAndConvertCSAddr(pVCpu, pRegFrame->eflags, pRegFrame->ss.Sel, pRegFrame->cs.Sel, &pRegFrame->cs, pRegFrame->rip, &PC); if (RT_FAILURE(rc)) { Log(("TRPMGCTrap06Handler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Rrc !!\n", pRegFrame->cs.Sel, pRegFrame->eip, pRegFrame->ss.Sel & X86_SEL_RPL, rc)); rc = trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_GUEST_TRAP, pRegFrame); Log6(("TRPMGC06: %Rrc (%04x:%08x EFL=%x) (SELM)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(6); return rc; } DISCPUSTATE Cpu; uint32_t cbOp; rc = EMInterpretDisasOneEx(pVM, pVCpu, (RTGCUINTPTR)PC, pRegFrame, &Cpu, &cbOp); if (RT_FAILURE(rc)) { rc = trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); Log6(("TRPMGC06: %Rrc (%04x:%08x EFL=%x) (EM)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(6); return rc; } /* * UD2 in a patch? * Note! PATMGCHandleIllegalInstrTrap doesn't always return. */ if ( Cpu.pCurInstr->uOpcode == OP_ILLUD2 && PATMIsPatchGCAddr(pVM, pRegFrame->eip)) { LogFlow(("TRPMGCTrap06Handler: -> PATMRCHandleIllegalInstrTrap\n")); rc = PATMRCHandleIllegalInstrTrap(pVM, pRegFrame); /** @todo These tests are completely unnecessary, should just follow the * flow and return at the end of the function. */ 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) { rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); Log6(("TRPMGC06: %Rrc (%04x:%08x EFL=%x) (PATM)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(6); return rc; } } /* * Speed up dtrace and don't entrust invalid lock sequences to the recompiler. */ else if (Cpu.fPrefix & DISPREFIX_LOCK) { Log(("TRPMGCTrap06Handler: pc=%08x op=%d\n", pRegFrame->eip, Cpu.pCurInstr->uOpcode)); #ifdef DTRACE_EXPERIMENT /** @todo fix/remove/permanent-enable this when DIS/PATM handles invalid lock sequences. */ Assert(!PATMIsPatchGCAddr(pVM, pRegFrame->eip)); rc = TRPMForwardTrap(pVCpu, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP, 0x6); Assert(rc == VINF_EM_RAW_GUEST_TRAP); #else rc = VINF_EM_RAW_EMULATE_INSTR; #endif } /* * Handle MONITOR - it causes an #UD exception instead of #GP when not executed in ring 0. */ else if (Cpu.pCurInstr->uOpcode == OP_MONITOR) { LogFlow(("TRPMGCTrap06Handler: -> EMInterpretInstructionCPU\n")); rc = EMInterpretInstructionDisasState(pVCpu, &Cpu, pRegFrame, PC, EMCODETYPE_SUPERVISOR); } /* Never generate a raw trap here; it might be an instruction, that requires emulation. */ else { LogFlow(("TRPMGCTrap06Handler: -> VINF_EM_RAW_EMULATE_INSTR\n")); rc = VINF_EM_RAW_EMULATE_INSTR; } } else { LogFlow(("TRPMGCTrap06Handler: -> TRPMForwardTrap\n")); rc = TRPMForwardTrap(pVCpu, pRegFrame, 0x6, 0, TRPM_TRAP_NO_ERRORCODE, TRPM_TRAP, 0x6); Assert(rc == VINF_EM_RAW_GUEST_TRAP); } rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); Log6(("TRPMGC06: %Rrc (%04x:%08x EFL=%x)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(6); return rc; } /** * 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap07Handler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); LogFlow(("TRPMGC07: %04x:%08x EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(7); PGMRZDynMapStartAutoSet(pVCpu); int rc = CPUMHandleLazyFPU(pVCpu); rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); Log6(("TRPMGC07: %Rrc (%04x:%08x EFL=%x)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(7); return rc; } /** * \#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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap0bHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); LogFlow(("TRPMGC0b: %04x:%08x EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(0xb); PGMRZDynMapStartAutoSet(pVCpu); /* * 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! */ RTGCPTR GCPtr; if ( SELMValidateAndConvertCSAddr(pVCpu, pRegFrame->eflags, pRegFrame->ss.Sel, pRegFrame->cs.Sel, &pRegFrame->cs, (RTGCPTR)pRegFrame->eip, &GCPtr) == VINF_SUCCESS) { uint8_t *pu8Code = (uint8_t *)(uintptr_t)GCPtr; /* * 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. */ pTrpmCpu->uActiveVector = UINT32_MAX; Log6(("TRPMGC0b: %Rrc (%04x:%08x EFL=%x) (CG)\n", VINF_EM_RAW_RING_SWITCH, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(0xb); PGMRZDynMapReleaseAutoSet(pVCpu); return VINF_EM_RAW_RING_SWITCH; } } /* * Pass trap 0b as is to the recompiler in all other cases. */ Log6(("TRPMGC0b: %Rrc (%04x:%08x EFL=%x)\n", VINF_EM_RAW_GUEST_TRAP, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); PGMRZDynMapReleaseAutoSet(pVCpu); TRPM_EXIT_DBG_HOOK(0xb); 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 Pointer to the VM. * @param pVCpu Pointer to the VMCPU. * @param pRegFrame Pointer to the register frame for the trap. * @param pCpu The opcode info. * @param PC The program counter corresponding to cs:eip in pRegFrame. */ static int trpmGCTrap0dHandlerRing0(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC) { int rc; TRPM_ENTER_DBG_HOOK(0xd); /* * Try handle it here, if not return to HC and emulate/interpret it there. */ switch (pCpu->pCurInstr->uOpcode) { case OP_INT3: /* * Little hack to make the code below not fail */ pCpu->Param1.fUse = DISUSE_IMMEDIATE8; pCpu->Param1.uValue = 3; /* fallthru */ case OP_INT: { Assert(pCpu->Param1.fUse & DISUSE_IMMEDIATE8); Assert(!(PATMIsPatchGCAddr(pVM, PC))); if (pCpu->Param1.uValue == 3) { /* Int 3 replacement patch? */ if (PATMRCHandleInt3PatchTrap(pVM, pRegFrame) == VINF_SUCCESS) { AssertFailed(); return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame); } } rc = TRPMForwardTrap(pVCpu, pRegFrame, (uint32_t)pCpu->Param1.uValue, pCpu->cbInstr, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT, 0xd); if (RT_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP) { TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame); } pVCpu->trpm.s.uActiveVector = (pVCpu->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT; pVCpu->trpm.s.enmActiveType = TRPM_SOFTWARE_INT; return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_RING_SWITCH_INT, pRegFrame); } #ifdef PATM_EMULATE_SYSENTER case OP_SYSEXIT: case OP_SYSRET: rc = PATMSysCall(pVM, pRegFrame, pCpu); TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); #endif case OP_HLT: /* If it's in patch code, defer to ring-3. */ if (PATMIsPatchGCAddr(pVM, PC)) break; pRegFrame->eip += pCpu->cbInstr; TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, 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: /* just in case */ case OP_RDPMC: case OP_CLTS: case OP_WBINVD: /* nop */ case OP_RDMSR: case OP_WRMSR: { rc = EMInterpretInstructionDisasState(pVCpu, pCpu, pRegFrame, PC, EMCODETYPE_SUPERVISOR); if (rc == VERR_EM_INTERPRETER) rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED; TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); } } TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, 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 Pointer to the VM. * @param pVCpu Pointer to the VMCPU. * @param pRegFrame Pointer to the register frame for the trap. * @param pCpu The opcode info. * @param PC The program counter corresponding to cs:eip in pRegFrame. */ static int trpmGCTrap0dHandlerRing3(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu, RTGCPTR PC) { int rc; Assert(!pRegFrame->eflags.Bits.u1VM); TRPM_ENTER_DBG_HOOK(0xd); switch (pCpu->pCurInstr->uOpcode) { /* * 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.fUse = DISUSE_IMMEDIATE8; pCpu->Param1.uValue = 3; /* fall thru */ case OP_INT: { Assert(pCpu->Param1.fUse & DISUSE_IMMEDIATE8); rc = TRPMForwardTrap(pVCpu, pRegFrame, (uint32_t)pCpu->Param1.uValue, pCpu->cbInstr, TRPM_TRAP_NO_ERRORCODE, TRPM_SOFTWARE_INT, 0xd); if (RT_SUCCESS(rc) && rc != VINF_EM_RAW_GUEST_TRAP) { TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame); } pVCpu->trpm.s.uActiveVector = (pVCpu->trpm.s.uActiveErrorCode & X86_TRAP_ERR_SEL_MASK) >> X86_TRAP_ERR_SEL_SHIFT; pVCpu->trpm.s.enmActiveType = TRPM_SOFTWARE_INT; TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, 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) { TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, pRegFrame); } /* else no break; */ #endif case OP_BOUND: case OP_INTO: pVCpu->trpm.s.uActiveVector = UINT32_MAX; TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_RING_SWITCH, pRegFrame); /* * Handle virtualized TSC & PMC reads, just in case. */ case OP_RDTSC: case OP_RDPMC: { rc = EMInterpretInstructionDisasState(pVCpu, pCpu, pRegFrame, PC, EMCODETYPE_SUPERVISOR); if (rc == VERR_EM_INTERPRETER) rc = VINF_EM_RAW_EXCEPTION_PRIVILEGED; TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); } /* * STI and CLI are I/O privileged, i.e. if IOPL */ case OP_STI: case OP_CLI: { uint32_t efl = CPUMRawGetEFlags(pVCpu); uint32_t cpl = CPUMRCGetGuestCPL(pVCpu, pRegFrame); if (X86_EFL_GET_IOPL(efl) >= cpl) { LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> REM\n")); TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RESCHEDULE_REM, pRegFrame); } LogFlow(("trpmGCTrap0dHandlerRing3: CLI/STI -> #GP(0) iopl=%x, cpl=%x\n", X86_EFL_GET_IOPL(efl), cpl)); break; } } /* * A genuine guest fault. */ TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_GUEST_TRAP, pRegFrame); } /** * Emulates RDTSC for the \#GP handler. * * @returns VINF_SUCCESS or VINF_EM_RAW_EMULATE_INSTR. * * @param pVM Pointer to the VM. * @param pVCpu Pointer to the VMCPU. * @param pRegFrame Pointer to the register frame for the trap. * This will be updated on successful return. */ DECLINLINE(int) trpmGCTrap0dHandlerRdTsc(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame) { STAM_COUNTER_INC(&pVM->trpm.s.StatTrap0dRdTsc); TRPM_ENTER_DBG_HOOK(0xd); if (CPUMGetGuestCR4(pVCpu) & X86_CR4_TSD) { TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); /* will trap (optimize later). */ } uint64_t uTicks = TMCpuTickGet(pVCpu); pRegFrame->eax = uTicks; pRegFrame->edx = uTicks >> 32; pRegFrame->eip += 2; TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_SUCCESS, 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 Pointer to the VM. * @param pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. */ static int trpmGCTrap0dHandler(PVM pVM, PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); LogFlow(("trpmGCTrap0dHandler: cs:eip=%RTsel:%08RX32 uErr=%RGv EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, pTrpmCpu->uActiveErrorCode, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(0xd); /* * Convert and validate CS. */ STAM_PROFILE_START(&pVM->trpm.s.StatTrap0dDisasm, a); RTGCPTR PC; int rc = SELMValidateAndConvertCSAddr(pVCpu, pRegFrame->eflags, pRegFrame->ss.Sel, pRegFrame->cs.Sel, &pRegFrame->cs, pRegFrame->rip, &PC); if (RT_FAILURE(rc)) { Log(("trpmGCTrap0dHandler: Failed to convert %RTsel:%RX32 (cpl=%d) - rc=%Rrc !!\n", pRegFrame->cs.Sel, pRegFrame->eip, pRegFrame->ss.Sel & X86_SEL_RPL, rc)); TRPM_EXIT_DBG_HOOK(0xd); STAM_PROFILE_STOP(&pVM->trpm.s.StatTrap0dDisasm, a); return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); } /* * Disassemble the instruction. */ DISCPUSTATE Cpu; uint32_t cbOp; rc = EMInterpretDisasOneEx(pVM, pVCpu, PC, pRegFrame, &Cpu, &cbOp); if (RT_FAILURE(rc)) { AssertMsgFailed(("DISCoreOneEx failed to PC=%RGv rc=%Rrc\n", PC, rc)); TRPM_EXIT_DBG_HOOK(0xd); STAM_PROFILE_STOP(&pVM->trpm.s.StatTrap0dDisasm, a); return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, pRegFrame); } STAM_PROFILE_STOP(&pVM->trpm.s.StatTrap0dDisasm, a); /* * Optimize RDTSC traps. * Some guests (like Solaris) are using RDTSC all over the place and * will end up trapping a *lot* because of that. * * Note: it's no longer safe to access the instruction opcode directly due to possible stale code TLB entries */ if (Cpu.pCurInstr->uOpcode == OP_RDTSC) return trpmGCTrap0dHandlerRdTsc(pVM, pVCpu, pRegFrame); /* * Deal with I/O port access. */ if ( pVCpu->trpm.s.uActiveErrorCode == 0 && (Cpu.pCurInstr->fOpType & DISOPTYPE_PORTIO)) { VBOXSTRICTRC rcStrict = IOMRCIOPortHandler(pVM, pVCpu, pRegFrame, &Cpu); if (IOM_SUCCESS(rcStrict)) pRegFrame->rip += cbOp; rc = VBOXSTRICTRC_TODO(rcStrict); TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); } /* * Deal with Ring-0 (privileged instructions) */ if ( (pRegFrame->ss.Sel & X86_SEL_RPL) <= 1 && !pRegFrame->eflags.Bits.u1VM) return trpmGCTrap0dHandlerRing0(pVM, pVCpu, pRegFrame, &Cpu, PC); /* * Deal with Ring-3 GPs. */ if (!pRegFrame->eflags.Bits.u1VM) return trpmGCTrap0dHandlerRing3(pVM, pVCpu, pRegFrame, &Cpu, PC); /* * Deal with v86 code. * * We always set IOPL to zero which makes e.g. pushf fault in V86 * mode. The guest might use IOPL=3 and therefore not expect a #GP. * Simply fall back to the recompiler to emulate this instruction if * that's the case. To get the correct we must use CPUMRawGetEFlags. */ X86EFLAGS eflags; eflags.u32 = CPUMRawGetEFlags(pVCpu); /* Get the correct value. */ Log3(("TRPM #GP V86: cs:eip=%04x:%08x IOPL=%d efl=%08x\n", pRegFrame->cs.Sel, pRegFrame->eip, eflags.Bits.u2IOPL, eflags.u)); if (eflags.Bits.u2IOPL != 3) { Assert(EMIsRawRing1Enabled(pVM) || eflags.Bits.u2IOPL == 0); rc = TRPMForwardTrap(pVCpu, pRegFrame, 0xD, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP, 0xd); Assert(rc == VINF_EM_RAW_GUEST_TRAP); TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); } TRPM_EXIT_DBG_HOOK(0xd); return trpmGCExitTrap(pVM, pVCpu, VINF_EM_RAW_EMULATE_INSTR, 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap0dHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); LogFlow(("TRPMGC0d: %04x:%08x err=%x EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, (uint32_t)pVCpu->trpm.s.uActiveErrorCode, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(0xd); PGMRZDynMapStartAutoSet(pVCpu); int rc = trpmGCTrap0dHandler(pVM, pTrpmCpu, pRegFrame); switch (rc) { case VINF_EM_RAW_GUEST_TRAP: case VINF_EM_RAW_EXCEPTION_PRIVILEGED: if (PATMIsPatchGCAddr(pVM, pRegFrame->eip)) rc = VINF_PATM_PATCH_TRAP_GP; break; case VINF_EM_RAW_INTERRUPT_PENDING: Assert(TRPMHasTrap(pVCpu)); /* no break; */ case VINF_PGM_SYNC_CR3: case VINF_EM_RAW_EMULATE_INSTR: case VINF_IOM_R3_IOPORT_READ: case VINF_IOM_R3_IOPORT_WRITE: case VINF_IOM_R3_MMIO_WRITE: case VINF_IOM_R3_MMIO_READ: case VINF_IOM_R3_MMIO_READ_WRITE: case VINF_PATM_PATCH_INT3: case VINF_EM_NO_MEMORY: case VINF_EM_RAW_TO_R3: case VINF_EM_RAW_TIMER_PENDING: case VINF_EM_PENDING_REQUEST: case VINF_EM_HALT: case VINF_SELM_SYNC_GDT: case VINF_SUCCESS: break; default: AssertMsg(PATMIsPatchGCAddr(pVM, pRegFrame->eip) == false, ("return code %d\n", rc)); break; } Log6(("TRPMGC0d: %Rrc (%04x:%08x EFL=%x)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(0xd); 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCTrap0eHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { PVM pVM = TRPMCPU_2_VM(pTrpmCpu); PVMCPU pVCpu = TRPMCPU_2_VMCPU(pTrpmCpu); LogFlow(("TRPMGC0e: %04x:%08x err=%x cr2=%08x EFL=%x\n", pRegFrame->cs.Sel, pRegFrame->eip, (uint32_t)pVCpu->trpm.s.uActiveErrorCode, (uint32_t)pVCpu->trpm.s.uActiveCR2, CPUMRawGetEFlags(pVCpu))); TRPM_ENTER_DBG_HOOK(0xe); /* * This is all PGM stuff. */ PGMRZDynMapStartAutoSet(pVCpu); int rc = PGMTrap0eHandler(pVCpu, pVCpu->trpm.s.uActiveErrorCode, pRegFrame, (RTGCPTR)pVCpu->trpm.s.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, pRegFrame->eip)) rc = VINF_PATCH_EMULATE_INSTR; break; case VINF_EM_RAW_GUEST_TRAP: if (PATMIsPatchGCAddr(pVM, pRegFrame->eip)) { PGMRZDynMapReleaseAutoSet(pVCpu); TRPM_EXIT_DBG_HOOK(0xe); return VINF_PATM_PATCH_TRAP_PF; } rc = TRPMForwardTrap(pVCpu, pRegFrame, 0xE, 0, TRPM_TRAP_HAS_ERRORCODE, TRPM_TRAP, 0xe); Assert(rc == VINF_EM_RAW_GUEST_TRAP); break; case VINF_EM_RAW_INTERRUPT_PENDING: Assert(TRPMHasTrap(pVCpu)); /* no break; */ case VINF_IOM_R3_MMIO_READ: case VINF_IOM_R3_MMIO_WRITE: case VINF_IOM_R3_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_EM_NO_MEMORY: case VINF_CSAM_PENDING_ACTION: case VINF_PGM_SYNC_CR3: /** @todo Check this with Sander. */ break; default: AssertMsg(PATMIsPatchGCAddr(pVM, pRegFrame->eip) == false, ("Patch address for return code %d. eip=%08x\n", rc, pRegFrame->eip)); break; } rc = trpmGCExitTrap(pVM, pVCpu, rc, pRegFrame); Log6(("TRPMGC0e: %Rrc (%04x:%08x EFL=%x)\n", rc, pRegFrame->cs.Sel, pRegFrame->eip, CPUMRawGetEFlags(pVCpu))); TRPM_EXIT_DBG_HOOK(0xe); return rc; } /** * 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 Pointer to the VM. * @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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap0bHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { return trpmGCHyperGeneric(TRPMCPU_2_VM(pTrpmCpu), 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap0dHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { return trpmGCHyperGeneric(TRPMCPU_2_VM(pTrpmCpu), 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 pTrpmCpu Pointer to TRPMCPU data (within VM). * @param pRegFrame Pointer to the register frame for the trap. * @internal */ DECLASM(int) TRPMGCHyperTrap0eHandler(PTRPMCPU pTrpmCpu, PCPUMCTXCORE pRegFrame) { return trpmGCHyperGeneric(TRPMCPU_2_VM(pTrpmCpu), pRegFrame, g_aTrap0dHandlers, g_aTrap0dHandlersEnd); } /** * Deal with hypervisor traps occurring when resuming execution on a trap. * * There is a little problem with recursive RC (hypervisor) traps. We deal with * this by not allowing recursion without it being the subject of a guru * meditation. (We used to / tried to handle this but there isn't any reason * for it.) * * So, do NOT use this for handling RC traps! * * @returns VBox status code. (Anything but VINF_SUCCESS will cause guru.) * @param pVM Pointer to the VM. * @param pRegFrame Register frame. * @param uUser User arg. */ DECLCALLBACK(int) trpmRCTrapInGeneric(PVM pVM, PCPUMCTXCORE pRegFrame, uintptr_t uUser) { Log(("********************************************************\n")); Log(("trpmRCTrapInGeneric: eip=%RX32 uUser=%#x\n", pRegFrame->eip, uUser)); Log(("********************************************************\n")); /* * This used to be kind of complicated, but since we stopped storing * the register frame on the stack and instead storing it directly * in the CPUMCPU::Guest structure, we just have to figure out which * status to hand on to the host and let the recompiler/IEM do its * job. */ switch (uUser) { case TRPM_TRAP_IN_MOV_GS: case TRPM_TRAP_IN_MOV_FS: case TRPM_TRAP_IN_MOV_ES: case TRPM_TRAP_IN_MOV_DS: TRPMGCHyperReturnToHost(pVM, VINF_EM_RAW_STALE_SELECTOR); break; case TRPM_TRAP_IN_IRET: case TRPM_TRAP_IN_IRET | TRPM_TRAP_IN_V86: TRPMGCHyperReturnToHost(pVM, VINF_EM_RAW_IRET_TRAP); break; default: AssertMsgFailed(("Invalid uUser=%#x\n", uUser)); return VERR_TRPM_BAD_TRAP_IN_OP; } AssertMsgFailed(("Impossible!\n")); return VERR_TRPM_IPE_3; }