| 1 | /* $Id: DBGFMem.cpp 13502 2008-10-22 15:52:53Z vboxsync $ */
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| 2 | /** @file
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| 3 | * DBGF - Debugger Facility, Memory Methods.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007 Sun Microsystems, Inc.
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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.alldomusa.eu.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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 18 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 19 | * additional information or have any questions.
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| 20 | */
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| 21 |
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| 22 |
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| 23 | /*******************************************************************************
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| 24 | * Header Files *
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| 25 | *******************************************************************************/
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| 26 | #define LOG_GROUP LOG_GROUP_DBGF
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| 27 | #include <VBox/dbgf.h>
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| 28 | #include <VBox/pgm.h>
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| 29 | #include "DBGFInternal.h"
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| 30 | #include <VBox/vm.h>
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| 31 | #include <VBox/err.h>
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| 32 | #include <VBox/log.h>
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| 33 |
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| 34 |
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| 35 |
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| 36 | /**
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| 37 | * Scan guest memory for an exact byte string.
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| 38 | *
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| 39 | * @returns VBox status code.
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| 40 | * @param pVM The VM handle.
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| 41 | * @param pAddress Where to store the mixed address.
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| 42 | * @param cbRange The number of bytes to scan.
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| 43 | * @param pabNeedle What to search for - exact search.
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| 44 | * @param cbNeedle Size of the search byte string.
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| 45 | * @param pHitAddress Where to put the address of the first hit.
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| 46 | */
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| 47 | static DECLCALLBACK(int) dbgfR3MemScan(PVM pVM, PCDBGFADDRESS pAddress, RTGCUINTPTR cbRange, const uint8_t *pabNeedle, size_t cbNeedle,
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| 48 | PDBGFADDRESS pHitAddress)
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| 49 | {
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| 50 | /*
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| 51 | * Validate the input we use, PGM does the rest.
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| 52 | */
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| 53 | if (!DBGFR3AddrIsValid(pVM, pAddress))
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| 54 | return VERR_INVALID_POINTER;
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| 55 | if (!VALID_PTR(pHitAddress))
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| 56 | return VERR_INVALID_POINTER;
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| 57 | if (DBGFADDRESS_IS_HMA(pAddress))
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| 58 | return VERR_INVALID_POINTER;
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| 59 |
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| 60 | /*
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| 61 | * Select DBGF worker by addressing mode.
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| 62 | */
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| 63 | int rc;
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| 64 | PGMMODE enmMode = PGMGetGuestMode(pVM);
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| 65 | if ( enmMode == PGMMODE_REAL
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| 66 | || enmMode == PGMMODE_PROTECTED
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| 67 | || DBGFADDRESS_IS_PHYS(pAddress)
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| 68 | )
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| 69 | {
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| 70 | RTGCPHYS PhysHit;
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| 71 | rc = PGMR3DbgScanPhysical(pVM, pAddress->FlatPtr, cbRange, pabNeedle, cbNeedle, &PhysHit);
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| 72 | if (RT_SUCCESS(rc))
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| 73 | DBGFR3AddrFromPhys(pVM, pHitAddress, PhysHit);
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| 74 | }
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| 75 | else
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| 76 | {
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| 77 | if ( ( pAddress->FlatPtr >= _4G
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| 78 | || pAddress->FlatPtr + cbRange > _4G)
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| 79 | && enmMode != PGMMODE_AMD64
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| 80 | && enmMode != PGMMODE_AMD64_NX)
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| 81 | return VERR_DBGF_MEM_NOT_FOUND;
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| 82 | RTGCUINTPTR GCPtrHit;
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| 83 | rc = PGMR3DbgScanVirtual(pVM, pAddress->FlatPtr, cbRange, pabNeedle, cbNeedle, &GCPtrHit);
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| 84 | if (RT_SUCCESS(rc))
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| 85 | DBGFR3AddrFromFlat(pVM, pHitAddress, GCPtrHit);
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| 86 | }
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| 87 |
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| 88 | return rc;
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| 89 | }
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| 90 |
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| 91 |
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| 92 | /**
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| 93 | * Scan guest memory for an exact byte string.
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| 94 | *
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| 95 | * @returns VBox status codes:
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| 96 | * @retval VINF_SUCCESS and *pGCPtrHit on success.
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| 97 | * @retval VERR_DBGF_MEM_NOT_FOUND if not found.
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| 98 | * @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
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| 99 | * @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
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| 100 | *
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| 101 | * @param pVM The VM handle.
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| 102 | * @param pAddress Where to store the mixed address.
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| 103 | * @param cbRange The number of bytes to scan.
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| 104 | * @param pabNeedle What to search for - exact search.
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| 105 | * @param cbNeedle Size of the search byte string.
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| 106 | * @param pHitAddress Where to put the address of the first hit.
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| 107 | *
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| 108 | * @thread Any thread.
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| 109 | */
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| 110 | VMMR3DECL(int) DBGFR3MemScan(PVM pVM, PCDBGFADDRESS pAddress, RTGCUINTPTR cbRange, const uint8_t *pabNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
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| 111 | {
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| 112 | PVMREQ pReq;
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| 113 | int rc = VMR3ReqCall(pVM, &pReq, RT_INDEFINITE_WAIT, (PFNRT)dbgfR3MemScan, 6,
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| 114 | pVM, pAddress, cbRange, pabNeedle, cbNeedle, pHitAddress);
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| 115 | if (VBOX_SUCCESS(rc))
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| 116 | rc = pReq->iStatus;
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| 117 | VMR3ReqFree(pReq);
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| 118 |
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| 119 | return rc;
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| 120 | }
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| 121 |
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| 122 |
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| 123 | /**
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| 124 | * Read guest memory.
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| 125 | *
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| 126 | * @returns VBox status code.
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| 127 | * @param pVM Pointer to the shared VM structure.
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| 128 | * @param pAddress Where to start reading.
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| 129 | * @param pvBuf Where to store the data we've read.
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| 130 | * @param cbRead The number of bytes to read.
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| 131 | */
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| 132 | static DECLCALLBACK(int) dbgfR3MemRead(PVM pVM, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
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| 133 | {
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| 134 | /*
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| 135 | * Validate the input we use, PGM does the rest.
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| 136 | */
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| 137 | if (!DBGFR3AddrIsValid(pVM, pAddress))
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| 138 | return VERR_INVALID_POINTER;
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| 139 | if (!VALID_PTR(pvBuf))
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| 140 | return VERR_INVALID_POINTER;
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| 141 | if (DBGFADDRESS_IS_HMA(pAddress))
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| 142 | return VERR_INVALID_POINTER;
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| 143 |
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| 144 | /*
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| 145 | * Select DBGF worker by addressing mode.
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| 146 | */
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| 147 | int rc;
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| 148 | PGMMODE enmMode = PGMGetGuestMode(pVM);
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| 149 | if ( enmMode == PGMMODE_REAL
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| 150 | || enmMode == PGMMODE_PROTECTED
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| 151 | || DBGFADDRESS_IS_PHYS(pAddress) )
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| 152 | rc = PGMPhysSimpleReadGCPhys(pVM, pvBuf, pAddress->FlatPtr, cbRead);
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| 153 | else
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| 154 | {
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| 155 | if ( ( pAddress->FlatPtr >= _4G
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| 156 | || pAddress->FlatPtr + cbRead > _4G)
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| 157 | && enmMode != PGMMODE_AMD64
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| 158 | && enmMode != PGMMODE_AMD64_NX)
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| 159 | return VERR_PAGE_TABLE_NOT_PRESENT;
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| 160 | rc = PGMPhysSimpleReadGCPtr(pVM, pvBuf, pAddress->FlatPtr, cbRead);
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| 161 | }
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| 162 | return rc;
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| 163 | }
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| 164 |
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| 165 |
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| 166 | /**
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| 167 | * Read guest memory.
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| 168 | *
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| 169 | * @returns VBox status code.
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| 170 | * @param pVM Pointer to the shared VM structure.
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| 171 | * @param pAddress Where to start reading.
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| 172 | * @param pvBuf Where to store the data we've read.
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| 173 | * @param cbRead The number of bytes to read.
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| 174 | */
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| 175 | VMMR3DECL(int) DBGFR3MemRead(PVM pVM, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
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| 176 | {
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| 177 | PVMREQ pReq;
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| 178 | int rc = VMR3ReqCallU(pVM->pUVM, &pReq, RT_INDEFINITE_WAIT, 0, (PFNRT)dbgfR3MemRead, 4,
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| 179 | pVM, pAddress, pvBuf, cbRead);
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| 180 | if (VBOX_SUCCESS(rc))
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| 181 | rc = pReq->iStatus;
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| 182 | VMR3ReqFree(pReq);
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| 183 |
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| 184 | return rc;
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| 185 | }
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| 186 |
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| 187 |
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| 188 | /**
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| 189 | * Read a zero terminated string from guest memory.
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| 190 | *
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| 191 | * @returns VBox status code.
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| 192 | * @param pVM Pointer to the shared VM structure.
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| 193 | * @param pAddress Where to start reading.
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| 194 | * @param pszBuf Where to store the string.
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| 195 | * @param cchBuf The size of the buffer.
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| 196 | */
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| 197 | static DECLCALLBACK(int) dbgfR3MemReadString(PVM pVM, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
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| 198 | {
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| 199 | /*
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| 200 | * Validate the input we use, PGM does the rest.
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| 201 | */
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| 202 | if (!DBGFR3AddrIsValid(pVM, pAddress))
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| 203 | return VERR_INVALID_POINTER;
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| 204 | if (!VALID_PTR(pszBuf))
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| 205 | return VERR_INVALID_POINTER;
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| 206 | if (DBGFADDRESS_IS_HMA(pAddress))
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| 207 | return VERR_INVALID_POINTER;
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| 208 |
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| 209 | /*
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| 210 | * Select DBGF worker by addressing mode.
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| 211 | */
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| 212 | int rc;
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| 213 | PGMMODE enmMode = PGMGetGuestMode(pVM);
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| 214 | if ( enmMode == PGMMODE_REAL
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| 215 | || enmMode == PGMMODE_PROTECTED
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| 216 | || DBGFADDRESS_IS_PHYS(pAddress) )
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| 217 | rc = PGMPhysSimpleReadGCPhys(pVM, pszBuf, pAddress->FlatPtr, cchBuf);
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| 218 | else
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| 219 | {
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| 220 | if ( ( pAddress->FlatPtr >= _4G
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| 221 | || pAddress->FlatPtr + cchBuf > _4G)
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| 222 | && enmMode != PGMMODE_AMD64
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| 223 | && enmMode != PGMMODE_AMD64_NX)
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| 224 | return VERR_PAGE_TABLE_NOT_PRESENT;
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| 225 | rc = PGMPhysSimpleReadGCPtr(pVM, pszBuf, pAddress->FlatPtr, cchBuf);
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| 226 | }
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| 227 |
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| 228 | /*
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| 229 | * Make sure the result is terminated and that overflow is signaled.
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| 230 | */
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| 231 | if (!memchr(pszBuf, '\0', cchBuf))
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| 232 | {
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| 233 | pszBuf[cchBuf - 1] = '\0';
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| 234 | rc = VINF_BUFFER_OVERFLOW;
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| 235 | }
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| 236 | /*
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| 237 | * Handle partial reads (not perfect).
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| 238 | */
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| 239 | else if (RT_FAILURE(rc))
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| 240 | {
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| 241 | if (pszBuf[0])
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| 242 | rc = VINF_SUCCESS;
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| 243 | }
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| 244 |
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| 245 | return rc;
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| 246 | }
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| 247 |
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| 248 |
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| 249 | /**
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| 250 | * Read a zero terminated string from guest memory.
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| 251 | *
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| 252 | * @returns VBox status code.
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| 253 | * @param pVM Pointer to the shared VM structure.
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| 254 | * @param pAddress Where to start reading.
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| 255 | * @param pszBuf Where to store the string.
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| 256 | * @param cchBuf The size of the buffer.
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| 257 | */
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| 258 | VMMR3DECL(int) DBGFR3MemReadString(PVM pVM, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
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| 259 | {
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| 260 | /*
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| 261 | * Validate and zero output.
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| 262 | */
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| 263 | if (!VALID_PTR(pszBuf))
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| 264 | return VERR_INVALID_POINTER;
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| 265 | if (cchBuf <= 0)
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| 266 | return VERR_INVALID_PARAMETER;
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| 267 | memset(pszBuf, 0, cchBuf);
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| 268 |
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| 269 | /*
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| 270 | * Pass it on to the EMT.
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| 271 | */
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| 272 | PVMREQ pReq;
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| 273 | int rc = VMR3ReqCallU(pVM->pUVM, &pReq, RT_INDEFINITE_WAIT, 0, (PFNRT)dbgfR3MemReadString, 4,
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| 274 | pVM, pAddress, pszBuf, cchBuf);
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| 275 | if (VBOX_SUCCESS(rc))
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| 276 | rc = pReq->iStatus;
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| 277 | VMR3ReqFree(pReq);
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| 278 |
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| 279 | return rc;
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| 280 | }
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| 281 |
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