1 | /* $Id: PATMRC.cpp 41965 2012-06-29 02:52:49Z vboxsync $ */
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2 | /** @file
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3 | * PATM - Dynamic Guest OS Patching Manager - Raw-mode Context.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2012 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_PATM
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23 | #include <VBox/vmm/patm.h>
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24 | #include <VBox/vmm/cpum.h>
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25 | #include <VBox/vmm/stam.h>
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26 | #include <VBox/vmm/pgm.h>
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27 | #include <VBox/vmm/mm.h>
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28 | #include <VBox/vmm/em.h>
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29 | #ifdef VBOX_WITH_IEM
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30 | # include <VBox/vmm/iem.h>
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31 | #endif
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32 | #include <VBox/vmm/selm.h>
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33 | #include <VBox/vmm/mm.h>
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34 | #include "PATMInternal.h"
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35 | #include "PATMA.h"
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36 | #include <VBox/vmm/vm.h>
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37 | #include <VBox/dbg.h>
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38 | #include <VBox/dis.h>
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39 | #include <VBox/disopcode.h>
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40 | #include <VBox/err.h>
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41 | #include <VBox/log.h>
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42 | #include <iprt/assert.h>
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43 | #include <iprt/asm.h>
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44 | #include <iprt/string.h>
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45 |
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46 |
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47 | /**
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48 | * \#PF Virtual Handler callback for Guest access a page monitored by PATM
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49 | *
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50 | * @returns VBox status code (appropriate for trap handling and GC return).
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51 | * @param pVM Pointer to the VM.
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52 | * @param uErrorCode CPU Error code.
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53 | * @param pRegFrame Trap register frame.
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54 | * @param pvFault The fault address (cr2).
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55 | * @param pvRange The base address of the handled virtual range.
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56 | * @param offRange The offset of the access into this range.
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57 | * (If it's a EIP range this is the EIP, if not it's pvFault.)
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58 | */
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59 | VMMRCDECL(int) PATMGCMonitorPage(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
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60 | {
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61 | NOREF(uErrorCode); NOREF(pRegFrame); NOREF(pvFault); NOREF(pvRange); NOREF(offRange);
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62 | pVM->patm.s.pvFaultMonitor = (RTRCPTR)(RTRCUINTPTR)pvFault;
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63 | return VINF_PATM_CHECK_PATCH_PAGE;
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64 | }
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65 |
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66 |
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67 | /**
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68 | * Checks if the write is located on a page with was patched before.
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69 | * (if so, then we are not allowed to turn on r/w)
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70 | *
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71 | * @returns VBox status
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72 | * @param pVM Pointer to the VM.
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73 | * @param pRegFrame CPU context
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74 | * @param GCPtr GC pointer to write address
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75 | * @param cbWrite Nr of bytes to write
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76 | *
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77 | */
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78 | VMMRCDECL(int) PATMGCHandleWriteToPatchPage(PVM pVM, PCPUMCTXCORE pRegFrame, RTRCPTR GCPtr, uint32_t cbWrite)
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79 | {
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80 | RTGCUINTPTR pWritePageStart, pWritePageEnd;
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81 | PPATMPATCHPAGE pPatchPage;
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82 |
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83 | /* Quick boundary check */
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84 | if ( PAGE_ADDRESS(GCPtr) < PAGE_ADDRESS(pVM->patm.s.pPatchedInstrGCLowest)
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85 | || PAGE_ADDRESS(GCPtr) > PAGE_ADDRESS(pVM->patm.s.pPatchedInstrGCHighest)
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86 | )
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87 | return VERR_PATCH_NOT_FOUND;
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88 |
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89 | STAM_PROFILE_ADV_START(&pVM->patm.s.StatPatchWriteDetect, a);
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90 |
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91 | pWritePageStart = (RTRCUINTPTR)GCPtr & PAGE_BASE_GC_MASK;
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92 | pWritePageEnd = ((RTRCUINTPTR)GCPtr + cbWrite - 1) & PAGE_BASE_GC_MASK;
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93 |
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94 | pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (AVLOU32KEY)pWritePageStart);
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95 | if ( !pPatchPage
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96 | && pWritePageStart != pWritePageEnd
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97 | )
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98 | {
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99 | pPatchPage = (PPATMPATCHPAGE)RTAvloU32Get(CTXSUFF(&pVM->patm.s.PatchLookupTree)->PatchTreeByPage, (AVLOU32KEY)pWritePageEnd);
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100 | }
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101 |
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102 | #ifdef LOG_ENABLED
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103 | if (pPatchPage)
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104 | Log(("PATMGCHandleWriteToPatchPage: Found page %RRv for write to %RRv %d bytes (page low:high %RRv:%RRv\n", pPatchPage->Core.Key, GCPtr, cbWrite, pPatchPage->pLowestAddrGC, pPatchPage->pHighestAddrGC));
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105 | #endif
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106 |
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107 | if (pPatchPage)
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108 | {
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109 | if ( pPatchPage->pLowestAddrGC > (RTRCPTR)((RTRCUINTPTR)GCPtr + cbWrite - 1)
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110 | || pPatchPage->pHighestAddrGC < (RTRCPTR)GCPtr)
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111 | {
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112 | /* This part of the page was not patched; try to emulate the instruction. */
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113 | LogFlow(("PATMHandleWriteToPatchPage: Interpret %x accessing %RRv\n", pRegFrame->eip, GCPtr));
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114 | int rc = EMInterpretInstruction(VMMGetCpu0(pVM), pRegFrame, (RTGCPTR)(RTRCUINTPTR)GCPtr);
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115 | if (rc == VINF_SUCCESS)
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116 | {
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117 | STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpreted);
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118 | STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
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119 | return VINF_SUCCESS;
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120 | }
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121 | STAM_COUNTER_INC(&pVM->patm.s.StatPatchWriteInterpretedFailed);
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122 | }
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123 | R3PTRTYPE(PPATCHINFO) *paPatch = (R3PTRTYPE(PPATCHINFO) *)MMHyperR3ToRC(pVM, pPatchPage->papPatch);
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124 |
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125 | /* Increase the invalid write counter for each patch that's registered for that page. */
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126 | for (uint32_t i=0;i<pPatchPage->cCount;i++)
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127 | {
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128 | PPATCHINFO pPatch = (PPATCHINFO)MMHyperR3ToRC(pVM, paPatch[i]);
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129 |
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130 | pPatch->cInvalidWrites++;
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131 | }
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132 |
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133 | STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
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134 | return VINF_EM_RAW_EMULATE_INSTR;
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135 | }
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136 |
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137 | STAM_PROFILE_ADV_STOP(&pVM->patm.s.StatPatchWriteDetect, a);
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138 | return VERR_PATCH_NOT_FOUND;
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139 | }
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140 |
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141 |
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142 | /**
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143 | * Checks if the illegal instruction was caused by a patched instruction
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144 | *
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145 | * @returns VBox status
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146 | *
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147 | * @param pVM Pointer to the VM.
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148 | * @param pCtxCore The relevant core context.
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149 | */
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150 | VMMDECL(int) PATMRCHandleIllegalInstrTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
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151 | {
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152 | PPATMPATCHREC pRec;
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153 | PVMCPU pVCpu = VMMGetCpu0(pVM);
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154 | int rc;
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155 |
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156 | /* Very important check -> otherwise we have a security leak. */
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157 | AssertReturn(!pRegFrame->eflags.Bits.u1VM && (pRegFrame->ss.Sel & X86_SEL_RPL) == 1, VERR_ACCESS_DENIED);
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158 | Assert(PATMIsPatchGCAddr(pVM, pRegFrame->eip));
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159 |
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160 | /* OP_ILLUD2 in PATM generated code? */
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161 | if (CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
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162 | {
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163 | LogFlow(("PATMRC: Pending action %x at %x\n", CTXSUFF(pVM->patm.s.pGCState)->uPendingAction, pRegFrame->eip));
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164 |
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165 | /* Private PATM interface (@todo hack due to lack of anything generic). */
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166 | /* Parameters:
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167 | * eax = Pending action (currently PATM_ACTION_LOOKUP_ADDRESS)
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168 | * ecx = PATM_ACTION_MAGIC
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169 | */
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170 | if ( (pRegFrame->eax & CTXSUFF(pVM->patm.s.pGCState)->uPendingAction)
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171 | && pRegFrame->ecx == PATM_ACTION_MAGIC
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172 | )
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173 | {
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174 | CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
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175 |
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176 | switch (pRegFrame->eax)
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177 | {
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178 | case PATM_ACTION_LOOKUP_ADDRESS:
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179 | {
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180 | /* Parameters:
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181 | * edx = GC address to find
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182 | * edi = PATCHJUMPTABLE ptr
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183 | */
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184 | AssertMsg(!pRegFrame->edi || PATMIsPatchGCAddr(pVM, pRegFrame->edi), ("edx = %x\n", pRegFrame->edi));
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185 |
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186 | Log(("PATMRC: lookup %x jump table=%x\n", pRegFrame->edx, pRegFrame->edi));
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187 |
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188 | pRec = PATMQueryFunctionPatch(pVM, (RTRCPTR)(pRegFrame->edx));
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189 | if (pRec)
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190 | {
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191 | if (pRec->patch.uState == PATCH_ENABLED)
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192 | {
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193 | RTGCUINTPTR pRelAddr = pRec->patch.pPatchBlockOffset; /* make it relative */
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194 | rc = PATMAddBranchToLookupCache(pVM, (RTRCPTR)pRegFrame->edi, (RTRCPTR)pRegFrame->edx, pRelAddr);
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195 | if (rc == VINF_SUCCESS)
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196 | {
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197 | Log(("Patch block %RRv called as function\n", pRec->patch.pPrivInstrGC));
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198 | pRec->patch.flags |= PATMFL_CODE_REFERENCED;
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199 |
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200 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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201 | pRegFrame->eax = pRelAddr;
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202 | STAM_COUNTER_INC(&pVM->patm.s.StatFunctionFound);
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203 | return VINF_SUCCESS;
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204 | }
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205 | AssertFailed();
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206 | }
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207 | else
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208 | {
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209 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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210 | pRegFrame->eax = 0; /* make it fault */
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211 | STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
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212 | return VINF_SUCCESS;
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213 | }
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214 | }
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215 | else
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216 | {
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217 | /* Check first before trying to generate a function/trampoline patch. */
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218 | if (pVM->patm.s.fOutOfMemory)
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219 | {
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220 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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221 | pRegFrame->eax = 0; /* make it fault */
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222 | STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
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223 | return VINF_SUCCESS;
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224 | }
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225 | STAM_COUNTER_INC(&pVM->patm.s.StatFunctionNotFound);
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226 | return VINF_PATM_DUPLICATE_FUNCTION;
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227 | }
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228 | }
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229 |
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230 | case PATM_ACTION_DISPATCH_PENDING_IRQ:
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231 | /* Parameters:
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232 | * edi = GC address to jump to
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233 | */
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234 | Log(("PATMRC: Dispatch pending interrupt; eip=%x->%x\n", pRegFrame->eip, pRegFrame->edi));
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235 |
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236 | /* Change EIP to the guest address the patch would normally jump to after setting IF. */
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237 | pRegFrame->eip = pRegFrame->edi;
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238 |
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239 | Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX|PATM_RESTORE_ECX|PATM_RESTORE_EDI));
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240 | Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
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241 |
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242 | pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
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243 | pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
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244 | pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
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245 |
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246 | pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
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247 |
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248 | /* We are no longer executing PATM code; set PIF again. */
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249 | pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
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250 |
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251 | STAM_COUNTER_INC(&pVM->patm.s.StatCheckPendingIRQ);
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252 |
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253 | /* The caller will call trpmGCExitTrap, which will dispatch pending interrupts for us. */
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254 | return VINF_SUCCESS;
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255 |
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256 | case PATM_ACTION_PENDING_IRQ_AFTER_IRET:
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257 | /* Parameters:
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258 | * edi = GC address to jump to
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259 | */
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260 | Log(("PATMRC: Dispatch pending interrupt (iret); eip=%x->%x\n", pRegFrame->eip, pRegFrame->edi));
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261 | Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX|PATM_RESTORE_ECX|PATM_RESTORE_EDI));
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262 | Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
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263 |
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264 | /* Change EIP to the guest address of the iret. */
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265 | pRegFrame->eip = pRegFrame->edi;
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266 |
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267 | pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
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268 | pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
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269 | pRegFrame->edi = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEDI;
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270 | pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
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271 |
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272 | /* We are no longer executing PATM code; set PIF again. */
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273 | pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
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274 |
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275 | return VINF_PATM_PENDING_IRQ_AFTER_IRET;
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276 |
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277 | case PATM_ACTION_DO_V86_IRET:
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278 | {
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279 | Log(("PATMRC: Do iret to V86 code; eip=%x\n", pRegFrame->eip));
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280 | Assert(pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags == (PATM_RESTORE_EAX|PATM_RESTORE_ECX));
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281 | Assert(pVM->patm.s.CTXSUFF(pGCState)->fPIF == 0);
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282 |
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283 | pRegFrame->eax = pVM->patm.s.CTXSUFF(pGCState)->Restore.uEAX;
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284 | pRegFrame->ecx = pVM->patm.s.CTXSUFF(pGCState)->Restore.uECX;
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285 | pVM->patm.s.CTXSUFF(pGCState)->Restore.uFlags = 0;
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286 |
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287 | rc = EMInterpretIretV86ForPatm(pVM, pVCpu, pRegFrame);
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288 | if (RT_SUCCESS(rc))
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289 | {
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290 | STAM_COUNTER_INC(&pVM->patm.s.StatEmulIret);
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291 |
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292 | /* We are no longer executing PATM code; set PIF again. */
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293 | pVM->patm.s.CTXSUFF(pGCState)->fPIF = 1;
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294 | PGMRZDynMapReleaseAutoSet(pVCpu);
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295 | CPUMGCCallV86Code(pRegFrame);
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296 | /* does not return */
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297 | }
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298 | else
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299 | STAM_COUNTER_INC(&pVM->patm.s.StatEmulIretFailed);
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300 | return rc;
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301 | }
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302 |
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303 | #ifdef DEBUG
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304 | case PATM_ACTION_LOG_CLI:
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305 | Log(("PATMRC: CLI at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags) ));
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306 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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307 | return VINF_SUCCESS;
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308 |
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309 | case PATM_ACTION_LOG_STI:
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310 | Log(("PATMRC: STI at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags) ));
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311 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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312 | return VINF_SUCCESS;
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313 |
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314 | case PATM_ACTION_LOG_POPF_IF1:
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315 | Log(("PATMRC: POPF setting IF at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
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316 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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317 | return VINF_SUCCESS;
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318 |
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319 | case PATM_ACTION_LOG_POPF_IF0:
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320 | Log(("PATMRC: POPF at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
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321 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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322 | return VINF_SUCCESS;
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323 |
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324 | case PATM_ACTION_LOG_PUSHF:
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325 | Log(("PATMRC: PUSHF at %x (current IF=%d iopl=%d)\n", pRegFrame->eip, !!(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags & X86_EFL_IF), X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags) ));
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326 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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327 | return VINF_SUCCESS;
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328 |
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329 | case PATM_ACTION_LOG_IF1:
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330 | Log(("PATMRC: IF=1 escape from %x\n", pRegFrame->eip));
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331 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
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332 | return VINF_SUCCESS;
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333 |
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334 | case PATM_ACTION_LOG_IRET:
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335 | {
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336 | char *pIretFrame = (char *)pRegFrame->edx;
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337 | uint32_t eip, selCS, uEFlags;
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338 |
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339 | rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
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340 | rc |= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
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341 | rc |= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
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342 | if (rc == VINF_SUCCESS)
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343 | {
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344 | if ( (uEFlags & X86_EFL_VM)
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345 | || (selCS & X86_SEL_RPL) == 3)
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346 | {
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347 | uint32_t selSS, esp;
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348 |
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349 | rc |= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
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350 | rc |= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
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351 |
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352 | if (uEFlags & X86_EFL_VM)
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353 | {
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354 | uint32_t selDS, selES, selFS, selGS;
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355 | rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
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---|
356 | rc |= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
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357 | rc |= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
|
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358 | rc |= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
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359 | if (rc == VINF_SUCCESS)
|
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360 | {
|
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361 | Log(("PATMRC: IRET->VM stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
|
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362 | Log(("PATMRC: IRET->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
|
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363 | }
|
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364 | }
|
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365 | else
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366 | Log(("PATMRC: IRET stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
|
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367 | }
|
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368 | else
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369 | Log(("PATMRC: IRET stack frame: return address %04X:%x eflags=%08x\n", selCS, eip, uEFlags));
|
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370 | }
|
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371 | Log(("PATMRC: IRET from %x (IF->1) current eflags=%x\n", pRegFrame->eip, pVM->patm.s.CTXSUFF(pGCState)->uVMFlags));
|
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372 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
|
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373 | return VINF_SUCCESS;
|
---|
374 | }
|
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375 |
|
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376 | case PATM_ACTION_LOG_GATE_ENTRY:
|
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377 | {
|
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378 | char *pIretFrame = (char *)pRegFrame->edx;
|
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379 | uint32_t eip, selCS, uEFlags;
|
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380 |
|
---|
381 | rc = MMGCRamRead(pVM, &eip, pIretFrame, 4);
|
---|
382 | rc |= MMGCRamRead(pVM, &selCS, pIretFrame + 4, 4);
|
---|
383 | rc |= MMGCRamRead(pVM, &uEFlags, pIretFrame + 8, 4);
|
---|
384 | if (rc == VINF_SUCCESS)
|
---|
385 | {
|
---|
386 | if ( (uEFlags & X86_EFL_VM)
|
---|
387 | || (selCS & X86_SEL_RPL) == 3)
|
---|
388 | {
|
---|
389 | uint32_t selSS, esp;
|
---|
390 |
|
---|
391 | rc |= MMGCRamRead(pVM, &esp, pIretFrame + 12, 4);
|
---|
392 | rc |= MMGCRamRead(pVM, &selSS, pIretFrame + 16, 4);
|
---|
393 |
|
---|
394 | if (uEFlags & X86_EFL_VM)
|
---|
395 | {
|
---|
396 | uint32_t selDS, selES, selFS, selGS;
|
---|
397 | rc = MMGCRamRead(pVM, &selES, pIretFrame + 20, 4);
|
---|
398 | rc |= MMGCRamRead(pVM, &selDS, pIretFrame + 24, 4);
|
---|
399 | rc |= MMGCRamRead(pVM, &selFS, pIretFrame + 28, 4);
|
---|
400 | rc |= MMGCRamRead(pVM, &selGS, pIretFrame + 32, 4);
|
---|
401 | if (rc == VINF_SUCCESS)
|
---|
402 | {
|
---|
403 | Log(("PATMRC: GATE->VM stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
|
---|
404 | Log(("PATMRC: GATE->VM stack frame: DS=%04X ES=%04X FS=%04X GS=%04X\n", selDS, selES, selFS, selGS));
|
---|
405 | }
|
---|
406 | }
|
---|
407 | else
|
---|
408 | Log(("PATMRC: GATE stack frame: return address %04X:%x eflags=%08x ss:esp=%04X:%x\n", selCS, eip, uEFlags, selSS, esp));
|
---|
409 | }
|
---|
410 | else
|
---|
411 | Log(("PATMRC: GATE stack frame: return address %04X:%x eflags=%08x\n", selCS, eip, uEFlags));
|
---|
412 | }
|
---|
413 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
|
---|
414 | return VINF_SUCCESS;
|
---|
415 | }
|
---|
416 |
|
---|
417 | case PATM_ACTION_LOG_RET:
|
---|
418 | Log(("PATMRC: RET from %x to %x ESP=%x iopl=%d\n", pRegFrame->eip, pRegFrame->edx, pRegFrame->ebx, X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
|
---|
419 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
|
---|
420 | return VINF_SUCCESS;
|
---|
421 |
|
---|
422 | case PATM_ACTION_LOG_CALL:
|
---|
423 | Log(("PATMRC: CALL to %RRv return addr %RRv ESP=%x iopl=%d\n", pVM->patm.s.CTXSUFF(pGCState)->GCCallPatchTargetAddr, pVM->patm.s.CTXSUFF(pGCState)->GCCallReturnAddr, pRegFrame->edx, X86_EFL_GET_IOPL(pVM->patm.s.CTXSUFF(pGCState)->uVMFlags)));
|
---|
424 | pRegFrame->eip += PATM_ILLEGAL_INSTR_SIZE;
|
---|
425 | return VINF_SUCCESS;
|
---|
426 | #endif
|
---|
427 | default:
|
---|
428 | AssertFailed();
|
---|
429 | break;
|
---|
430 | }
|
---|
431 | }
|
---|
432 | else
|
---|
433 | AssertFailed();
|
---|
434 | CTXSUFF(pVM->patm.s.pGCState)->uPendingAction = 0;
|
---|
435 | }
|
---|
436 | AssertMsgFailed(("Unexpected OP_ILLUD2 in patch code at %x (pending action %x)!!!!\n", pRegFrame->eip, CTXSUFF(pVM->patm.s.pGCState)->uPendingAction));
|
---|
437 | return VINF_EM_RAW_EMULATE_INSTR;
|
---|
438 | }
|
---|
439 |
|
---|
440 | /**
|
---|
441 | * Checks if the int 3 was caused by a patched instruction
|
---|
442 | *
|
---|
443 | * @returns Strict VBox status, includes all statuses that
|
---|
444 | * EMInterpretInstructionDisasState and
|
---|
445 | * @retval VINF_SUCCESS
|
---|
446 | * @retval VINF_PATM_PATCH_INT3
|
---|
447 | * @retval VINF_EM_RAW_EMULATE_INSTR
|
---|
448 | *
|
---|
449 | * @param pVM Pointer to the VM.
|
---|
450 | * @param pCtxCore The relevant core context.
|
---|
451 | */
|
---|
452 | VMMRCDECL(int) PATMRCHandleInt3PatchTrap(PVM pVM, PCPUMCTXCORE pRegFrame)
|
---|
453 | {
|
---|
454 | PPATMPATCHREC pRec;
|
---|
455 | int rc;
|
---|
456 |
|
---|
457 | AssertReturn(!pRegFrame->eflags.Bits.u1VM && (pRegFrame->ss.Sel & X86_SEL_RPL) == 1, VERR_ACCESS_DENIED);
|
---|
458 |
|
---|
459 | /* Int 3 in PATM generated code? (most common case) */
|
---|
460 | if (PATMIsPatchGCAddr(pVM, pRegFrame->eip))
|
---|
461 | {
|
---|
462 | /* Note! Hardcoded assumption about it being a single byte int 3 instruction. */
|
---|
463 | pRegFrame->eip--;
|
---|
464 | return VINF_PATM_PATCH_INT3;
|
---|
465 | }
|
---|
466 |
|
---|
467 | /** @todo could use simple caching here to speed things up. */
|
---|
468 | pRec = (PPATMPATCHREC)RTAvloU32Get(&CTXSUFF(pVM->patm.s.PatchLookupTree)->PatchTree, (AVLOU32KEY)(pRegFrame->eip - 1)); /* eip is pointing to the instruction *after* 'int 3' already */
|
---|
469 | if (pRec && pRec->patch.uState == PATCH_ENABLED)
|
---|
470 | {
|
---|
471 | if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT_BLOCK)
|
---|
472 | {
|
---|
473 | Assert(pRec->patch.opcode == OP_CLI);
|
---|
474 | /* This is a special cli block that was turned into an int 3 patch. We jump to the generated code manually. */
|
---|
475 | pRegFrame->eip = (uint32_t)PATCHCODE_PTR_GC(&pRec->patch);
|
---|
476 | STAM_COUNTER_INC(&pVM->patm.s.StatInt3BlockRun);
|
---|
477 | return VINF_SUCCESS;
|
---|
478 | }
|
---|
479 | if (pRec->patch.flags & PATMFL_INT3_REPLACEMENT)
|
---|
480 | {
|
---|
481 | /* eip is pointing to the instruction *after* 'int 3' already */
|
---|
482 | pRegFrame->eip = pRegFrame->eip - 1;
|
---|
483 |
|
---|
484 | PATM_STAT_RUN_INC(&pRec->patch);
|
---|
485 |
|
---|
486 | Log(("PATMHandleInt3PatchTrap found int3 for %s at %x\n", patmGetInstructionString(pRec->patch.opcode, 0), pRegFrame->eip));
|
---|
487 |
|
---|
488 | switch(pRec->patch.opcode)
|
---|
489 | {
|
---|
490 | case OP_CPUID:
|
---|
491 | case OP_IRET:
|
---|
492 | break;
|
---|
493 |
|
---|
494 | case OP_STR:
|
---|
495 | case OP_SGDT:
|
---|
496 | case OP_SLDT:
|
---|
497 | case OP_SIDT:
|
---|
498 | case OP_LSL:
|
---|
499 | case OP_LAR:
|
---|
500 | case OP_SMSW:
|
---|
501 | case OP_VERW:
|
---|
502 | case OP_VERR:
|
---|
503 | default:
|
---|
504 | PATM_STAT_FAULT_INC(&pRec->patch);
|
---|
505 | pRec->patch.cTraps++;
|
---|
506 | return VINF_EM_RAW_EMULATE_INSTR;
|
---|
507 | }
|
---|
508 |
|
---|
509 | DISCPUMODE enmCpuMode = SELMGetCpuModeFromSelector(VMMGetCpu0(pVM), pRegFrame->eflags, pRegFrame->cs.Sel, 0);
|
---|
510 | if (enmCpuMode != DISCPUMODE_32BIT)
|
---|
511 | {
|
---|
512 | AssertFailed();
|
---|
513 | return VINF_EM_RAW_EMULATE_INSTR;
|
---|
514 | }
|
---|
515 |
|
---|
516 | #ifdef VBOX_WITH_IEM
|
---|
517 | VBOXSTRICTRC rcStrict;
|
---|
518 | rcStrict = IEMExecOneWithPrefetchedByPC(VMMGetCpu0(pVM), pRegFrame, pRegFrame->rip,
|
---|
519 | pRec->patch.aPrivInstr, pRec->patch.cbPrivInstr);
|
---|
520 | rc = VBOXSTRICTRC_TODO(rcStrict);
|
---|
521 | #else
|
---|
522 | uint32_t cbOp;
|
---|
523 | DISCPUSTATE cpu;
|
---|
524 | rc = DISInstr(&pRec->patch.aPrivInstr[0], enmCpuMode, &cpu, &cbOp);
|
---|
525 | if (RT_FAILURE(rc))
|
---|
526 | {
|
---|
527 | Log(("DISCoreOne failed with %Rrc\n", rc));
|
---|
528 | PATM_STAT_FAULT_INC(&pRec->patch);
|
---|
529 | pRec->patch.cTraps++;
|
---|
530 | return VINF_EM_RAW_EMULATE_INSTR;
|
---|
531 | }
|
---|
532 |
|
---|
533 | rc = EMInterpretInstructionDisasState(VMMGetCpu0(pVM), &cpu, pRegFrame, 0 /* not relevant here */,
|
---|
534 | EMCODETYPE_SUPERVISOR);
|
---|
535 | #endif
|
---|
536 | if (RT_FAILURE(rc))
|
---|
537 | {
|
---|
538 | Log(("EMInterpretInstructionCPU failed with %Rrc\n", rc));
|
---|
539 | PATM_STAT_FAULT_INC(&pRec->patch);
|
---|
540 | pRec->patch.cTraps++;
|
---|
541 | return VINF_EM_RAW_EMULATE_INSTR;
|
---|
542 | }
|
---|
543 | return rc;
|
---|
544 | }
|
---|
545 | }
|
---|
546 | return VERR_PATCH_NOT_FOUND;
|
---|
547 | }
|
---|
548 |
|
---|