| 1 | /* $Id: DBGFMem.cpp 15997 2009-01-16 16:13:23Z 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.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 | * 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 pcbRange The number of bytes to scan. Passed as a pointer because
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| 43 | * it may be 64-bit.
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| 44 | * @param pabNeedle What to search for - exact search.
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| 45 | * @param cbNeedle Size of the search byte string.
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| 46 | * @param pHitAddress Where to put the address of the first hit.
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| 47 | */
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| 48 | static DECLCALLBACK(int) dbgfR3MemScan(PVM pVM, PCDBGFADDRESS pAddress, PCRTGCUINTPTR pcbRange, const uint8_t *pabNeedle, size_t cbNeedle,
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| 49 | PDBGFADDRESS pHitAddress)
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| 50 | {
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| 51 | /*
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| 52 | * Validate the input we use, PGM does the rest.
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| 53 | */
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| 54 | RTGCUINTPTR cbRange = *pcbRange;
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| 55 | if (!DBGFR3AddrIsValid(pVM, pAddress))
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| 56 | return VERR_INVALID_POINTER;
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| 57 | if (!VALID_PTR(pHitAddress))
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| 58 | return VERR_INVALID_POINTER;
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| 59 | if (DBGFADDRESS_IS_HMA(pAddress))
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| 60 | return VERR_INVALID_POINTER;
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| 61 |
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| 62 | /*
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| 63 | * Select DBGF worker by addressing mode.
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| 64 | */
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| 65 | int rc;
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| 66 | PGMMODE enmMode = PGMGetGuestMode(pVM);
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| 67 | if ( enmMode == PGMMODE_REAL
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| 68 | || enmMode == PGMMODE_PROTECTED
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| 69 | || DBGFADDRESS_IS_PHYS(pAddress)
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| 70 | )
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| 71 | {
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| 72 | RTGCPHYS PhysHit;
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| 73 | rc = PGMR3DbgScanPhysical(pVM, pAddress->FlatPtr, cbRange, pabNeedle, cbNeedle, &PhysHit);
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| 74 | if (RT_SUCCESS(rc))
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| 75 | DBGFR3AddrFromPhys(pVM, pHitAddress, PhysHit);
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| 76 | }
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| 77 | else
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| 78 | {
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| 79 | #if GC_ARCH_BITS > 32
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| 80 | if ( ( pAddress->FlatPtr >= _4G
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| 81 | || pAddress->FlatPtr + cbRange > _4G)
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| 82 | && enmMode != PGMMODE_AMD64
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| 83 | && enmMode != PGMMODE_AMD64_NX)
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| 84 | return VERR_DBGF_MEM_NOT_FOUND;
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| 85 | #endif
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| 86 | RTGCUINTPTR GCPtrHit;
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| 87 | rc = PGMR3DbgScanVirtual(pVM, pAddress->FlatPtr, cbRange, pabNeedle, cbNeedle, &GCPtrHit);
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| 88 | if (RT_SUCCESS(rc))
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| 89 | DBGFR3AddrFromFlat(pVM, pHitAddress, GCPtrHit);
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| 90 | }
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| 91 |
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| 92 | return rc;
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| 93 | }
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| 94 |
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| 95 |
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| 96 | /**
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| 97 | * Scan guest memory for an exact byte string.
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| 98 | *
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| 99 | * @returns VBox status codes:
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| 100 | * @retval VINF_SUCCESS and *pGCPtrHit on success.
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| 101 | * @retval VERR_DBGF_MEM_NOT_FOUND if not found.
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| 102 | * @retval VERR_INVALID_POINTER if any of the pointer arguments are invalid.
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| 103 | * @retval VERR_INVALID_ARGUMENT if any other arguments are invalid.
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| 104 | *
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| 105 | * @param pVM The VM handle.
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| 106 | * @param pAddress Where to store the mixed address.
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| 107 | * @param cbRange The number of bytes to scan.
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| 108 | * @param pabNeedle What to search for - exact search.
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| 109 | * @param cbNeedle Size of the search byte string.
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| 110 | * @param pHitAddress Where to put the address of the first hit.
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| 111 | *
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| 112 | * @thread Any thread.
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| 113 | */
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| 114 | VMMR3DECL(int) DBGFR3MemScan(PVM pVM, PCDBGFADDRESS pAddress, RTGCUINTPTR cbRange, const uint8_t *pabNeedle, size_t cbNeedle, PDBGFADDRESS pHitAddress)
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| 115 | {
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| 116 | PVMREQ pReq;
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| 117 | int rc = VMR3ReqCall(pVM, VMREQDEST_ANY, &pReq, RT_INDEFINITE_WAIT, (PFNRT)dbgfR3MemScan, 6,
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| 118 | pVM, pAddress, &cbRange, pabNeedle, cbNeedle, pHitAddress);
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| 119 | if (RT_SUCCESS(rc))
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| 120 | rc = pReq->iStatus;
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| 121 | VMR3ReqFree(pReq);
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| 122 |
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| 123 | return rc;
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| 124 | }
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| 125 |
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| 126 |
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| 127 | /**
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| 128 | * Read guest memory.
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| 129 | *
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| 130 | * @returns VBox status code.
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| 131 | * @param pVM Pointer to the shared VM structure.
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| 132 | * @param pAddress Where to start reading.
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| 133 | * @param pvBuf Where to store the data we've read.
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| 134 | * @param cbRead The number of bytes to read.
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| 135 | */
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| 136 | static DECLCALLBACK(int) dbgfR3MemRead(PVM pVM, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
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| 137 | {
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| 138 | /*
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| 139 | * Validate the input we use, PGM does the rest.
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| 140 | */
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| 141 | if (!DBGFR3AddrIsValid(pVM, pAddress))
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| 142 | return VERR_INVALID_POINTER;
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| 143 | if (!VALID_PTR(pvBuf))
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| 144 | return VERR_INVALID_POINTER;
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| 145 | if (DBGFADDRESS_IS_HMA(pAddress))
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| 146 | return VERR_INVALID_POINTER;
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| 147 |
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| 148 | /*
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| 149 | * Select DBGF worker by addressing mode.
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| 150 | */
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| 151 | int rc;
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| 152 | PGMMODE enmMode = PGMGetGuestMode(pVM);
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| 153 | if ( enmMode == PGMMODE_REAL
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| 154 | || enmMode == PGMMODE_PROTECTED
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| 155 | || DBGFADDRESS_IS_PHYS(pAddress) )
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| 156 | rc = PGMPhysSimpleReadGCPhys(pVM, pvBuf, pAddress->FlatPtr, cbRead);
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| 157 | else
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| 158 | {
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| 159 | #if GC_ARCH_BITS > 32
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| 160 | if ( ( pAddress->FlatPtr >= _4G
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| 161 | || pAddress->FlatPtr + cbRead > _4G)
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| 162 | && enmMode != PGMMODE_AMD64
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| 163 | && enmMode != PGMMODE_AMD64_NX)
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| 164 | return VERR_PAGE_TABLE_NOT_PRESENT;
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| 165 | #endif
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| 166 | rc = PGMPhysSimpleReadGCPtr(pVM, pvBuf, pAddress->FlatPtr, cbRead);
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| 167 | }
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| 168 | return rc;
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| 169 | }
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| 170 |
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| 171 |
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| 172 | /**
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| 173 | * Read guest memory.
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| 174 | *
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| 175 | * @returns VBox status code.
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| 176 | * @param pVM Pointer to the shared VM structure.
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| 177 | * @param pAddress Where to start reading.
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| 178 | * @param pvBuf Where to store the data we've read.
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| 179 | * @param cbRead The number of bytes to read.
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| 180 | */
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| 181 | VMMR3DECL(int) DBGFR3MemRead(PVM pVM, PCDBGFADDRESS pAddress, void *pvBuf, size_t cbRead)
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| 182 | {
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| 183 | PVMREQ pReq;
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| 184 | int rc = VMR3ReqCallU(pVM->pUVM, VMREQDEST_ANY, &pReq, RT_INDEFINITE_WAIT, 0, (PFNRT)dbgfR3MemRead, 4,
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| 185 | pVM, pAddress, pvBuf, cbRead);
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| 186 | if (RT_SUCCESS(rc))
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| 187 | rc = pReq->iStatus;
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| 188 | VMR3ReqFree(pReq);
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| 189 |
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| 190 | return rc;
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| 191 | }
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| 192 |
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| 193 |
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| 194 | /**
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| 195 | * Read a zero terminated string from guest memory.
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| 196 | *
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| 197 | * @returns VBox status code.
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| 198 | * @param pVM Pointer to the shared VM structure.
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| 199 | * @param pAddress Where to start reading.
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| 200 | * @param pszBuf Where to store the string.
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| 201 | * @param cchBuf The size of the buffer.
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| 202 | */
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| 203 | static DECLCALLBACK(int) dbgfR3MemReadString(PVM pVM, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
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| 204 | {
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| 205 | /*
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| 206 | * Validate the input we use, PGM does the rest.
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| 207 | */
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| 208 | if (!DBGFR3AddrIsValid(pVM, pAddress))
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| 209 | return VERR_INVALID_POINTER;
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| 210 | if (!VALID_PTR(pszBuf))
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| 211 | return VERR_INVALID_POINTER;
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| 212 | if (DBGFADDRESS_IS_HMA(pAddress))
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| 213 | return VERR_INVALID_POINTER;
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| 214 |
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| 215 | /*
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| 216 | * Select DBGF worker by addressing mode.
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| 217 | */
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| 218 | int rc;
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| 219 | PGMMODE enmMode = PGMGetGuestMode(pVM);
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| 220 | if ( enmMode == PGMMODE_REAL
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| 221 | || enmMode == PGMMODE_PROTECTED
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| 222 | || DBGFADDRESS_IS_PHYS(pAddress) )
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| 223 | rc = PGMPhysSimpleReadGCPhys(pVM, pszBuf, pAddress->FlatPtr, cchBuf);
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| 224 | else
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| 225 | {
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| 226 | #if GC_ARCH_BITS > 32
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| 227 | if ( ( pAddress->FlatPtr >= _4G
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| 228 | || pAddress->FlatPtr + cchBuf > _4G)
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| 229 | && enmMode != PGMMODE_AMD64
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| 230 | && enmMode != PGMMODE_AMD64_NX)
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| 231 | return VERR_PAGE_TABLE_NOT_PRESENT;
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| 232 | #endif
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| 233 | rc = PGMPhysSimpleReadGCPtr(pVM, pszBuf, pAddress->FlatPtr, cchBuf);
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| 234 | }
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| 235 |
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| 236 | /*
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| 237 | * Make sure the result is terminated and that overflow is signaled.
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| 238 | */
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| 239 | if (!memchr(pszBuf, '\0', cchBuf))
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| 240 | {
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| 241 | pszBuf[cchBuf - 1] = '\0';
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| 242 | rc = VINF_BUFFER_OVERFLOW;
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| 243 | }
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| 244 | /*
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| 245 | * Handle partial reads (not perfect).
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| 246 | */
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| 247 | else if (RT_FAILURE(rc))
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| 248 | {
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| 249 | if (pszBuf[0])
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| 250 | rc = VINF_SUCCESS;
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| 251 | }
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| 252 |
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| 253 | return rc;
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| 254 | }
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| 255 |
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| 256 |
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| 257 | /**
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| 258 | * Read a zero terminated string from guest memory.
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| 259 | *
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| 260 | * @returns VBox status code.
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| 261 | * @param pVM Pointer to the shared VM structure.
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| 262 | * @param pAddress Where to start reading.
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| 263 | * @param pszBuf Where to store the string.
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| 264 | * @param cchBuf The size of the buffer.
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| 265 | */
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| 266 | VMMR3DECL(int) DBGFR3MemReadString(PVM pVM, PCDBGFADDRESS pAddress, char *pszBuf, size_t cchBuf)
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| 267 | {
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| 268 | /*
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| 269 | * Validate and zero output.
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| 270 | */
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| 271 | if (!VALID_PTR(pszBuf))
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| 272 | return VERR_INVALID_POINTER;
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| 273 | if (cchBuf <= 0)
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| 274 | return VERR_INVALID_PARAMETER;
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| 275 | memset(pszBuf, 0, cchBuf);
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| 276 |
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| 277 | /*
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| 278 | * Pass it on to the EMT.
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| 279 | */
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| 280 | PVMREQ pReq;
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| 281 | int rc = VMR3ReqCallU(pVM->pUVM, VMREQDEST_ANY, &pReq, RT_INDEFINITE_WAIT, 0, (PFNRT)dbgfR3MemReadString, 4,
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| 282 | pVM, pAddress, pszBuf, cchBuf);
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| 283 | if (RT_SUCCESS(rc))
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| 284 | rc = pReq->iStatus;
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| 285 | VMR3ReqFree(pReq);
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| 286 |
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| 287 | return rc;
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| 288 | }
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| 289 |
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