| 1 | /* $Id: DBGFRZ.cpp 62478 2016-07-22 18:29:06Z vboxsync $ */
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| 2 | /** @file
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| 3 | * DBGF - Debugger Facility, RZ part.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2016 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_DBGF
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| 23 | #include <VBox/vmm/dbgf.h>
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| 24 | #include <VBox/vmm/selm.h>
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| 25 | #include <VBox/log.h>
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| 26 | #include "DBGFInternal.h"
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| 27 | #include <VBox/vmm/vm.h>
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| 28 | #include <VBox/err.h>
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| 29 | #include <iprt/assert.h>
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| 30 |
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * \#DB (Debug event) handler.
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| 35 | *
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| 36 | * @returns VBox status code.
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| 37 | * VINF_SUCCESS means we completely handled this trap,
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| 38 | * other codes are passed execution to host context.
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| 39 | *
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| 40 | * @param pVM The cross context VM structure.
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| 41 | * @param pVCpu The cross context virtual CPU structure.
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| 42 | * @param pRegFrame Pointer to the register frame for the trap.
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| 43 | * @param uDr6 The DR6 hypervisor register value.
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| 44 | * @param fAltStepping Alternative stepping indicator.
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| 45 | */
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| 46 | VMMRZ_INT_DECL(int) DBGFRZTrap01Handler(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame, RTGCUINTREG uDr6, bool fAltStepping)
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| 47 | {
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| 48 | #ifdef IN_RC
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| 49 | const bool fInHyper = !(pRegFrame->ss.Sel & X86_SEL_RPL) && !pRegFrame->eflags.Bits.u1VM;
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| 50 | #else
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| 51 | NOREF(pRegFrame);
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| 52 | const bool fInHyper = false;
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| 53 | #endif
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| 54 |
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| 55 | /** @todo Intel docs say that X86_DR6_BS has the highest priority... */
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| 56 | /*
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| 57 | * A breakpoint?
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| 58 | */
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| 59 | AssertCompile(X86_DR6_B0 == 1 && X86_DR6_B1 == 2 && X86_DR6_B2 == 4 && X86_DR6_B3 == 8);
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| 60 | if ( (uDr6 & (X86_DR6_B0 | X86_DR6_B1 | X86_DR6_B2 | X86_DR6_B3))
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| 61 | && pVM->dbgf.s.cEnabledHwBreakpoints > 0)
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| 62 | {
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| 63 | for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); iBp++)
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| 64 | {
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| 65 | if ( ((uint32_t)uDr6 & RT_BIT_32(iBp))
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| 66 | && pVM->dbgf.s.aHwBreakpoints[iBp].enmType == DBGFBPTYPE_REG)
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| 67 | {
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| 68 | pVCpu->dbgf.s.iActiveBp = pVM->dbgf.s.aHwBreakpoints[iBp].iBp;
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| 69 | pVCpu->dbgf.s.fSingleSteppingRaw = false;
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| 70 | LogFlow(("DBGFRZTrap03Handler: hit hw breakpoint %d at %04x:%RGv\n",
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| 71 | pVM->dbgf.s.aHwBreakpoints[iBp].iBp, pRegFrame->cs.Sel, pRegFrame->rip));
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| 72 |
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| 73 | return fInHyper ? VINF_EM_DBG_HYPER_BREAKPOINT : VINF_EM_DBG_BREAKPOINT;
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| 74 | }
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| 75 | }
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| 76 | }
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| 77 |
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| 78 | /*
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| 79 | * Single step?
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| 80 | * Are we single stepping or is it the guest?
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| 81 | */
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| 82 | if ( (uDr6 & X86_DR6_BS)
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| 83 | && (fInHyper || pVCpu->dbgf.s.fSingleSteppingRaw || fAltStepping))
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| 84 | {
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| 85 | pVCpu->dbgf.s.fSingleSteppingRaw = false;
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| 86 | LogFlow(("DBGFRZTrap01Handler: single step at %04x:%RGv\n", pRegFrame->cs.Sel, pRegFrame->rip));
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| 87 | return fInHyper ? VINF_EM_DBG_HYPER_STEPPED : VINF_EM_DBG_STEPPED;
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| 88 | }
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| 89 |
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| 90 | /*
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| 91 | * Either an ICEBP in hypervisor code or a guest related debug exception
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| 92 | * of sorts.
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| 93 | */
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| 94 | if (RT_UNLIKELY(fInHyper))
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| 95 | {
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| 96 | LogFlow(("DBGFRZTrap01Handler: unabled bp at %04x:%RGv\n", pRegFrame->cs.Sel, pRegFrame->rip));
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| 97 | return VERR_DBGF_HYPER_DB_XCPT;
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| 98 | }
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| 99 |
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| 100 | LogFlow(("DBGFRZTrap01Handler: guest debug event %#x at %04x:%RGv!\n", (uint32_t)uDr6, pRegFrame->cs.Sel, pRegFrame->rip));
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| 101 | return VINF_EM_RAW_GUEST_TRAP;
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| 102 | }
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| 103 |
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| 104 |
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| 105 | /**
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| 106 | * \#BP (Breakpoint) handler.
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| 107 | *
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| 108 | * @returns VBox status code.
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| 109 | * VINF_SUCCESS means we completely handled this trap,
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| 110 | * other codes are passed execution to host context.
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| 111 | *
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| 112 | * @param pVM The cross context VM structure.
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| 113 | * @param pVCpu The cross context virtual CPU structure.
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| 114 | * @param pRegFrame Pointer to the register frame for the trap.
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| 115 | */
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| 116 | VMMRZ_INT_DECL(int) DBGFRZTrap03Handler(PVM pVM, PVMCPU pVCpu, PCPUMCTXCORE pRegFrame)
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| 117 | {
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| 118 | #ifdef IN_RC
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| 119 | const bool fInHyper = !(pRegFrame->ss.Sel & X86_SEL_RPL) && !pRegFrame->eflags.Bits.u1VM;
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| 120 | #else
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| 121 | const bool fInHyper = false;
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| 122 | #endif
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| 123 |
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| 124 | /*
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| 125 | * Get the trap address and look it up in the breakpoint table.
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| 126 | * Don't bother if we don't have any breakpoints.
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| 127 | */
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| 128 | unsigned cToSearch = pVM->dbgf.s.Int3.cToSearch;
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| 129 | if (cToSearch > 0)
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| 130 | {
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| 131 | RTGCPTR pPc;
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| 132 | int rc = SELMValidateAndConvertCSAddr(pVCpu, pRegFrame->eflags, pRegFrame->ss.Sel, pRegFrame->cs.Sel, &pRegFrame->cs,
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| 133 | #ifdef IN_RC
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| 134 | pRegFrame->eip - 1,
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| 135 | #else
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| 136 | pRegFrame->rip /* no -1 in R0 */,
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| 137 | #endif
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| 138 | &pPc);
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| 139 | AssertRCReturn(rc, rc);
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| 140 |
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| 141 | unsigned iBp = pVM->dbgf.s.Int3.iStartSearch;
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| 142 | while (cToSearch-- > 0)
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| 143 | {
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| 144 | if ( pVM->dbgf.s.aBreakpoints[iBp].u.GCPtr == (RTGCUINTPTR)pPc
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| 145 | && pVM->dbgf.s.aBreakpoints[iBp].enmType == DBGFBPTYPE_INT3)
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| 146 | {
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| 147 | pVM->dbgf.s.aBreakpoints[iBp].cHits++;
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| 148 | pVCpu->dbgf.s.iActiveBp = pVM->dbgf.s.aBreakpoints[iBp].iBp;
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| 149 |
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| 150 | LogFlow(("DBGFRZTrap03Handler: hit breakpoint %d at %RGv (%04x:%RGv) cHits=0x%RX64\n",
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| 151 | pVM->dbgf.s.aBreakpoints[iBp].iBp, pPc, pRegFrame->cs.Sel, pRegFrame->rip,
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| 152 | pVM->dbgf.s.aBreakpoints[iBp].cHits));
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| 153 | return fInHyper
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| 154 | ? VINF_EM_DBG_HYPER_BREAKPOINT
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| 155 | : VINF_EM_DBG_BREAKPOINT;
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| 156 | }
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| 157 | iBp++;
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| 158 | }
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| 159 | }
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| 160 |
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| 161 | return fInHyper
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| 162 | ? VINF_EM_DBG_HYPER_ASSERTION
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| 163 | : VINF_EM_RAW_GUEST_TRAP;
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| 164 | }
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| 165 |
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