1 | /* $Id: DBGFR0.cpp 12989 2008-10-06 02:15:39Z vboxsync $ */
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2 | /** @file
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3 | * DBGF - Debugger Facility, R0 part.
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4 | *
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5 | * Almost identical to DBGFGC.cpp, except for the fInHyper stuff.
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6 | */
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7 |
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8 | /*
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9 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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10 | *
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11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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12 | * available from http://www.virtualbox.org. This file is free software;
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13 | * you can redistribute it and/or modify it under the terms of the GNU
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14 | * General Public License (GPL) as published by the Free Software
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15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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18 | *
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19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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20 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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21 | * additional information or have any questions.
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22 | */
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23 |
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24 |
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25 | /*******************************************************************************
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26 | * Header Files *
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27 | *******************************************************************************/
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28 | #include <VBox/dbgf.h>
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29 | #include <VBox/selm.h>
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30 | #include <VBox/log.h>
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31 | #include "DBGFInternal.h"
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32 | #include <VBox/vm.h>
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33 | #include <VBox/err.h>
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34 | #include <iprt/assert.h>
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35 |
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36 |
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37 |
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38 | /**
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39 | * \#DB (Debug event) handler.
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40 | *
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41 | * @returns VBox status code.
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42 | * VINF_SUCCESS means we completely handled this trap,
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43 | * other codes are passed execution to host context.
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44 | *
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45 | * @param pVM The VM handle.
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46 | * @param pRegFrame Pointer to the register frame for the trap.
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47 | * @param uDr6 The DR6 register value.
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48 | */
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49 | VMMR0DECL(int) DBGFR0Trap01Handler(PVM pVM, PCPUMCTXCORE pRegFrame, RTGCUINTREG uDr6)
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50 | {
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51 | /** @todo Intel docs say that X86_DR6_BS has the highest priority... */
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52 | /*
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53 | * A breakpoint?
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54 | */
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55 | if (uDr6 & (X86_DR6_B0 | X86_DR6_B1 | X86_DR6_B2 | X86_DR6_B3))
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56 | {
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57 | Assert(X86_DR6_B0 == 1 && X86_DR6_B1 == 2 && X86_DR6_B2 == 4 && X86_DR6_B3 == 8);
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58 | for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aHwBreakpoints); iBp++)
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59 | {
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60 | if ( (uDr6 & RT_BIT(iBp))
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61 | && pVM->dbgf.s.aHwBreakpoints[iBp].enmType == DBGFBPTYPE_REG)
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62 | {
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63 | pVM->dbgf.s.iActiveBp = pVM->dbgf.s.aHwBreakpoints[iBp].iBp;
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64 | pVM->dbgf.s.fSingleSteppingRaw = false;
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65 | LogFlow(("DBGFR0Trap03Handler: hit hw breakpoint %d at %04x:%08x\n",
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66 | pVM->dbgf.s.aHwBreakpoints[iBp].iBp, pRegFrame->cs, pRegFrame->eip));
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67 |
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68 | return VINF_EM_DBG_BREAKPOINT;
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69 | }
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70 | }
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71 | }
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72 |
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73 | /*
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74 | * Single step?
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75 | * Are we single stepping or is it the guest?
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76 | */
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77 | if ( (uDr6 & X86_DR6_BS)
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78 | && (pVM->dbgf.s.fSingleSteppingRaw))
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79 | {
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80 | pVM->dbgf.s.fSingleSteppingRaw = false;
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81 | LogFlow(("DBGFR0Trap01Handler: single step at %04x:%08x\n", pRegFrame->cs, pRegFrame->eip));
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82 | return VINF_EM_DBG_STEPPED;
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83 | }
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84 |
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85 | /*
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86 | * Currently we only implement single stepping in the guest,
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87 | * so we'll bitch if this is not a BS event.
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88 | */
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89 | AssertMsg(uDr6 & X86_DR6_BS, ("hey! we're not doing guest BPs yet! dr6=%RTreg %04x:%08\n",
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90 | uDr6, pRegFrame->cs, pRegFrame->eip));
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91 | /** @todo virtualize DRx. */
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92 | LogFlow(("DBGFR0Trap01Handler: guest debug event %RTreg at %04x:%08x!\n", uDr6, pRegFrame->cs, pRegFrame->eip));
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93 | return VINF_EM_RAW_GUEST_TRAP;
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94 | }
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95 |
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96 |
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97 | /**
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98 | * \#BP (Breakpoint) handler.
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99 | *
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100 | * @returns VBox status code.
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101 | * VINF_SUCCESS means we completely handled this trap,
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102 | * other codes are passed execution to host context.
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103 | *
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104 | * @param pVM The VM handle.
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105 | * @param pRegFrame Pointer to the register frame for the trap.
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106 | */
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107 | VMMR0DECL(int) DBGFR0Trap03Handler(PVM pVM, PCPUMCTXCORE pRegFrame)
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108 | {
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109 | /*
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110 | * Get the trap address and look it up in the breakpoint table.
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111 | * Don't bother if we don't have any breakpoints.
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112 | */
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113 | if (pVM->dbgf.s.cBreakpoints > 0)
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114 | {
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115 | RTGCPTR pPc;
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116 | int rc = SELMValidateAndConvertCSAddr(pVM, pRegFrame->eflags, pRegFrame->ss, pRegFrame->cs, &pRegFrame->csHid,
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117 | (RTGCPTR)((RTGCUINTPTR)pRegFrame->eip - 1),
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118 | &pPc);
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119 | AssertRCReturn(rc, rc);
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120 |
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121 | for (unsigned iBp = 0; iBp < RT_ELEMENTS(pVM->dbgf.s.aBreakpoints); iBp++)
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122 | {
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123 | if ( pVM->dbgf.s.aBreakpoints[iBp].GCPtr == (RTGCUINTPTR)pPc
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124 | && pVM->dbgf.s.aBreakpoints[iBp].enmType == DBGFBPTYPE_INT3)
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125 | {
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126 | pVM->dbgf.s.aBreakpoints[iBp].cHits++;
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127 | pVM->dbgf.s.iActiveBp = pVM->dbgf.s.aBreakpoints[iBp].iBp;
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128 |
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129 | LogFlow(("DBGFR0Trap03Handler: hit breakpoint %d at %RGv (%04x:%08x) cHits=0x%RX64\n",
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130 | pVM->dbgf.s.aBreakpoints[iBp].iBp, pPc, pRegFrame->cs, pRegFrame->eip,
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131 | pVM->dbgf.s.aBreakpoints[iBp].cHits));
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132 | return VINF_EM_DBG_BREAKPOINT;
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133 | }
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134 | }
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135 | }
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136 |
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137 | return VINF_EM_RAW_GUEST_TRAP;
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138 | }
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139 |
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