| 1 | /* $Id: CSAMInternal.h 3723 2007-07-19 18:46:00Z vboxsync $ */
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| 2 | /** @file
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| 3 | * CSAM - Internal header file.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 innotek GmbH
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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 as published by the Free Software Foundation,
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| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * If you received this file as part of a commercial VirtualBox
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| 18 | * distribution, then only the terms of your commercial VirtualBox
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| 19 | * license agreement apply instead of the previous paragraph.
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| 20 | */
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| 21 |
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| 22 | #ifndef ___CSAMInternal_h
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| 23 | #define ___CSAMInternal_h
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| 24 |
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| 25 | #include <VBox/cdefs.h>
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| 26 | #include <VBox/types.h>
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| 27 | #include <VBox/csam.h>
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| 28 | #include <VBox/dis.h>
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| 29 | #include <VBox/log.h>
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| 30 |
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| 31 | #if !defined(IN_CSAM_R3) && !defined(IN_CSAM_R0) && !defined(IN_CSAM_GC)
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| 32 | # error "Not in CSAM! This is an internal header!"
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| 33 | #endif
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| 34 |
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| 35 | /** Page flags.
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| 36 | * These are placed in the three bits available for system programs in
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| 37 | * the page entries.
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| 38 | * @{ */
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| 39 | #ifndef PGM_PTFLAGS_CSAM_VALIDATED
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| 40 | /** Scanned and approved by CSAM (tm). */
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| 41 | /** NOTE: Must be identical to the one defined in PGMInternal.h!! */
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| 42 | #define PGM_PTFLAGS_CSAM_VALIDATED BIT64(11)
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| 43 | #endif
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| 44 |
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| 45 | /** @} */
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| 46 |
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| 47 | #define CSAM_SSM_VERSION 14
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| 48 |
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| 49 | #define CSAM_PGDIRBMP_CHUNKS 1024
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| 50 |
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| 51 | #define CSAM_PAGE_BITMAP_SIZE (PAGE_SIZE/(sizeof(uint8_t)*8))
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| 52 |
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| 53 | /* Maximum nr of dirty page that are cached. */
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| 54 | #define CSAM_MAX_DIRTY_PAGES 32
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| 55 |
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| 56 | /* Maximum number of cached addresses of dangerous instructions that have been scanned before. */
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| 57 | #define CSAM_MAX_DANGR_INSTR 16 /* power of two! */
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| 58 | #define CSAM_MAX_DANGR_INSTR_MASK (CSAM_MAX_DANGR_INSTR-1)
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| 59 |
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| 60 | /* Maximum number of possible dangerous code pages that we'll flush after a world switch */
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| 61 | #define CSAM_MAX_CODE_PAGES_FLUSH 32
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| 62 |
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| 63 | #define CSAM_MAX_CALLEXIT_RET 16
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| 64 |
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| 65 | /* copy from PATMInternal.h */
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| 66 | #define SIZEOF_NEARJUMP32 5 //opcode byte + 4 byte relative offset
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| 67 |
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| 68 | typedef struct
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| 69 | {
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| 70 | RTGCPTR pInstrAfterRetGC[CSAM_MAX_CALLEXIT_RET];
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| 71 | uint32_t cInstrAfterRet;
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| 72 | } CSAMCALLEXITREC, *PCSAMCALLEXITREC;
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| 73 |
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| 74 | typedef struct
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| 75 | {
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| 76 | HCPTRTYPE(uint8_t *) pPageLocStartHC;
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| 77 | HCPTRTYPE(uint8_t *) pPageLocEndHC;
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| 78 | GCPTRTYPE(uint8_t *) pGuestLoc;
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| 79 | uint32_t depth; //call/jump depth
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| 80 |
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| 81 | PCSAMCALLEXITREC pCallExitRec;
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| 82 | } CSAMP2GLOOKUPREC, *PCSAMP2GLOOKUPREC;
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| 83 |
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| 84 | typedef struct
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| 85 | {
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| 86 | RTGCPTR pPageGC;
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| 87 | RTGCPHYS GCPhys;
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| 88 | uint64_t fFlags;
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| 89 | uint32_t uSize;
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| 90 |
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| 91 | uint8_t *pBitmap;
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| 92 |
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| 93 | bool fCode32;
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| 94 | bool fMonitorActive;
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| 95 | bool fMonitorInvalidation;
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| 96 |
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| 97 | CSAMTAG enmTag;
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| 98 |
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| 99 | uint64_t u64Hash;
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| 100 | } CSAMPAGE, *PCSAMPAGE;
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| 101 |
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| 102 | typedef struct
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| 103 | {
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| 104 | // GC Patch pointer
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| 105 | RTGCPTR pInstrGC;
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| 106 |
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| 107 | // Disassembly state for original instruction
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| 108 | DISCPUSTATE cpu;
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| 109 |
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| 110 | uint32_t uState;
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| 111 |
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| 112 | PCSAMPAGE pPage;
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| 113 | } CSAMPATCH, *PCSAMPATCH;
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| 114 |
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| 115 | /**
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| 116 | * Lookup record for CSAM pages
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| 117 | */
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| 118 | typedef struct CSAMPAGEREC
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| 119 | {
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| 120 | /** The key is a GC virtual address. */
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| 121 | AVLPVNODECORE Core;
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| 122 | CSAMPAGE page;
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| 123 |
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| 124 | } CSAMPAGEREC, *PCSAMPAGEREC;
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| 125 |
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| 126 | /**
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| 127 | * Lookup record for patches
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| 128 | */
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| 129 | typedef struct CSAMPATCHREC
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| 130 | {
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| 131 | /** The key is a GC virtual address. */
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| 132 | AVLPVNODECORE Core;
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| 133 | CSAMPATCH patch;
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| 134 |
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| 135 | } CSAMPATCHREC, *PCSAMPATCHREC;
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| 136 |
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| 137 |
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| 138 | /**
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| 139 | * CSAM VM Instance data.
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| 140 | * Changes to this must checked against the padding of the CSAM union in VM!
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| 141 | * @note change SSM version when changing it!!
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| 142 | */
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| 143 | typedef struct CSAM
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| 144 | {
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| 145 | /** Offset to the VM structure.
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| 146 | * See CSAM2VM(). */
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| 147 | RTINT offVM;
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| 148 | #if HC_ARCH_BITS == 64
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| 149 | RTINT Alignment0; /**< Align pPageTree correctly. */
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| 150 | #endif
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| 151 |
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| 152 | HCPTRTYPE(PAVLPVNODECORE) pPageTree;
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| 153 |
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| 154 | /* Array to store previously scanned dangerous instructions, so we don't need to
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| 155 | * switch back to ring 3 each time we encounter them in GC.
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| 156 | */
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| 157 | RTGCPTR aDangerousInstr[CSAM_MAX_DANGR_INSTR];
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| 158 | uint32_t cDangerousInstr;
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| 159 | uint32_t iDangerousInstr;
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| 160 |
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| 161 | GCPTRTYPE(RTGCPTR *) pPDBitmapGC;
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| 162 | GCPTRTYPE(RTHCPTR *) pPDHCBitmapGC;
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| 163 | HCPTRTYPE(uint8_t **) pPDBitmapHC;
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| 164 | HCPTRTYPE(RTGCPTR *) pPDGCBitmapHC;
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| 165 |
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| 166 | /* Temporary storage during load/save state */
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| 167 | struct
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| 168 | {
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| 169 | HCPTRTYPE(PSSMHANDLE) pSSM;
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| 170 | uint32_t cPageRecords;
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| 171 | uint32_t cPatchPageRecords;
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| 172 | } savedstate;
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| 173 |
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| 174 | /* To keep track of dirty pages */
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| 175 | uint32_t cDirtyPages;
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| 176 | RTGCPTR pvDirtyBasePage[CSAM_MAX_DIRTY_PAGES];
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| 177 | RTGCPTR pvDirtyFaultPage[CSAM_MAX_DIRTY_PAGES];
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| 178 |
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| 179 | /* To keep track of possible code pages */
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| 180 | uint32_t cPossibleCodePages;
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| 181 | RTGCPTR pvPossibleCodePage[CSAM_MAX_CODE_PAGES_FLUSH];
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| 182 |
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| 183 | /* Set when scanning has started. */
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| 184 | bool fScanningStarted;
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| 185 |
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| 186 | /* Set when the IDT gates have been checked for the first time. */
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| 187 | bool fGatesChecked;
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| 188 | bool Alignment1[HC_ARCH_BITS == 32 ? 4 : 6]; /**< Align the stats on an 8-byte boundrary. */
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| 189 |
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| 190 | STAMCOUNTER StatNrTraps;
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| 191 | STAMCOUNTER StatNrPages;
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| 192 | STAMCOUNTER StatNrPagesInv;
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| 193 | STAMCOUNTER StatNrRemovedPages;
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| 194 | STAMCOUNTER StatNrPatchPages;
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| 195 | STAMCOUNTER StatNrPageNPHC;
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| 196 | STAMCOUNTER StatNrPageNPGC;
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| 197 | STAMCOUNTER StatNrFlushes;
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| 198 | STAMCOUNTER StatNrFlushesSkipped;
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| 199 | STAMCOUNTER StatNrKnownPagesHC;
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| 200 | STAMCOUNTER StatNrKnownPagesGC;
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| 201 | STAMCOUNTER StatNrInstr;
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| 202 | STAMCOUNTER StatNrBytesRead;
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| 203 | STAMCOUNTER StatNrOpcodeRead;
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| 204 | STAMPROFILE StatTime;
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| 205 | STAMPROFILE StatTimeCheckAddr;
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| 206 | STAMPROFILE StatTimeAddrConv;
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| 207 | STAMPROFILE StatTimeFlushPage;
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| 208 | STAMPROFILE StatTimeDisasm;
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| 209 | STAMPROFILE StatFlushDirtyPages;
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| 210 | STAMPROFILE StatCheckGates;
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| 211 | STAMCOUNTER StatCodePageModified;
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| 212 | STAMCOUNTER StatDangerousWrite;
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| 213 |
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| 214 | STAMCOUNTER StatInstrCacheHit;
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| 215 | STAMCOUNTER StatInstrCacheMiss;
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| 216 |
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| 217 | STAMCOUNTER StatPagePATM;
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| 218 | STAMCOUNTER StatPageCSAM;
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| 219 | STAMCOUNTER StatPageREM;
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| 220 | STAMCOUNTER StatNrUserPages;
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| 221 | STAMCOUNTER StatPageMonitor;
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| 222 | STAMCOUNTER StatPageRemoveREMFlush;
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| 223 |
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| 224 | STAMCOUNTER StatBitmapAlloc;
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| 225 |
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| 226 | STAMCOUNTER StatScanNextFunction;
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| 227 | STAMCOUNTER StatScanNextFunctionFailed;
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| 228 | } CSAM, *PCSAM;
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| 229 |
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| 230 | /**
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| 231 | * Call for analyzing the instructions following the privileged instr. for compliance with our heuristics
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| 232 | *
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| 233 | * @returns VBox status code.
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| 234 | * @param pVM The VM to operate on.
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| 235 | * @param pCpu CPU disassembly state
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| 236 | * @param pInstrHC Guest context pointer to privileged instruction
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| 237 | * @param pCurInstrGC Guest context pointer to current instruction
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| 238 | * @param pUserData User pointer
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| 239 | *
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| 240 | */
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| 241 | typedef int (VBOXCALL *PFN_CSAMR3ANALYSE)(PVM pVM, DISCPUSTATE *pCpu, GCPTRTYPE(uint8_t *) pInstrGC, GCPTRTYPE(uint8_t *) pCurInstrGC, PCSAMP2GLOOKUPREC pCacheRec, void *pUserData);
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| 242 |
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| 243 | /**
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| 244 | * Check if the current instruction is the start of a known guest block that requires our attention
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| 245 | *
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| 246 | * @param pVM The VM to operate on.
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| 247 | * @param pInstrGC Guest context pointer of instruction to check
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| 248 | * @param pInstrHC Host context pointer of instruction to check
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| 249 | * @param opcode Opcode of instruction at pInstrGC
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| 250 | *
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| 251 | * @returns true if patched
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| 252 | *
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| 253 | */
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| 254 | bool csamCheckGuestSpecificPatch(PVM pVM, RTGCPTR pInstrGC, HCPTRTYPE(uint8_t *) pInstrHC, uint32_t opcode);
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| 255 |
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| 256 | /**
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| 257 | * Calculate the branch destination
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| 258 | *
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| 259 | * @returns branch destination or 0 if failed
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| 260 | * @param pCpu Disassembly state of instruction.
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| 261 | * @param pBranchInstrGC GC pointer of branch instruction
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| 262 | */
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| 263 | inline RTGCPTR CSAMResolveBranch(PDISCPUSTATE pCpu, RTGCPTR pBranchInstrGC)
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| 264 | {
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| 265 | uint32_t disp;
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| 266 | if (pCpu->param1.flags & USE_IMMEDIATE8_REL)
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| 267 | {
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| 268 | disp = (int32_t)(char)pCpu->param1.parval;
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| 269 | }
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| 270 | else
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| 271 | if (pCpu->param1.flags & USE_IMMEDIATE16_REL)
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| 272 | {
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| 273 | disp = (int32_t)(uint16_t)pCpu->param1.parval;
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| 274 | }
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| 275 | else
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| 276 | if (pCpu->param1.flags & USE_IMMEDIATE32_REL)
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| 277 | {
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| 278 | disp = (int32_t)pCpu->param1.parval;
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| 279 | }
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| 280 | else
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| 281 | {
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| 282 | Log(("We don't support far jumps here!! (%08X)\n", pCpu->param1.flags));
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| 283 | return 0;
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| 284 | }
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| 285 | #ifdef IN_GC
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| 286 | return (RTGCPTR)((uint8_t *)pBranchInstrGC + pCpu->opsize + disp);
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| 287 | #else
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| 288 | return pBranchInstrGC + pCpu->opsize + disp;
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| 289 | #endif
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| 290 | }
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| 291 |
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| 292 | __BEGIN_DECLS
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| 293 | CSAMGCDECL(int) CSAMGCCodePageWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange);
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| 294 | __END_DECLS
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| 295 |
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| 296 | #endif
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