1 | /* $Id: alloc-r0drv.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Memory Allocation, Ring-0 Driver.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2007 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 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | *
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26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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28 | * additional information or have any questions.
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29 | */
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30 |
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31 |
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32 | /*******************************************************************************
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33 | * Header Files *
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34 | *******************************************************************************/
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35 | #include <iprt/string.h>
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36 | #include <iprt/alloc.h>
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37 | #include <iprt/assert.h>
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38 | #include <iprt/param.h>
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39 | #include "r0drv/alloc-r0drv.h"
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40 |
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41 |
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42 | /*******************************************************************************
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43 | * Defined Constants And Macros *
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44 | *******************************************************************************/
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45 | #ifdef RT_STRICT
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46 | # define RTR0MEM_STRICT
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47 | #endif
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48 |
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49 | #ifdef RTR0MEM_STRICT
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50 | # define RTR0MEM_FENCE_EXTRA 16
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51 | #else
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52 | # define RTR0MEM_FENCE_EXTRA 0
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53 | #endif
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54 |
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55 |
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56 | /*******************************************************************************
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57 | * Global Variables *
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58 | *******************************************************************************/
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59 | #ifdef RTR0MEM_STRICT
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60 | /** Fence data. */
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61 | static uint8_t const g_abFence[RTR0MEM_FENCE_EXTRA] =
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62 | {
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63 | 0x77, 0x88, 0x66, 0x99, 0x55, 0xaa, 0x44, 0xbb,
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64 | 0x33, 0xcc, 0x22, 0xdd, 0x11, 0xee, 0x00, 0xff
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65 | };
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66 | #endif
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67 |
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68 |
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69 |
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70 | /**
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71 | * Allocates temporary memory.
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72 | *
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73 | * Temporary memory blocks are used for not too large memory blocks which
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74 | * are believed not to stick around for too long. Using this API instead
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75 | * of RTMemAlloc() not only gives the heap manager room for optimization
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76 | * but makes the code easier to read.
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77 | *
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78 | * @returns Pointer to the allocated memory.
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79 | * @returns NULL on failure.
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80 | * @param cb Size in bytes of the memory block to allocated.
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81 | */
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82 | RTDECL(void *) RTMemTmpAlloc(size_t cb)
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83 | {
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84 | return RTMemAlloc(cb);
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85 | }
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86 |
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87 |
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88 | /**
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89 | * Allocates zero'ed temporary memory.
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90 | *
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91 | * Same as RTMemTmpAlloc() but the memory will be zero'ed.
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92 | *
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93 | * @returns Pointer to the allocated memory.
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94 | * @returns NULL on failure.
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95 | * @param cb Size in bytes of the memory block to allocated.
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96 | */
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97 | RTDECL(void *) RTMemTmpAllocZ(size_t cb)
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98 | {
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99 | return RTMemAllocZ(cb);
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100 | }
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101 |
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102 |
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103 | /**
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104 | * Free temporary memory.
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105 | *
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106 | * @param pv Pointer to memory block.
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107 | */
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108 | RTDECL(void) RTMemTmpFree(void *pv)
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109 | {
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110 | return RTMemFree(pv);
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111 | }
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112 |
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113 |
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114 | /**
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115 | * Allocates memory.
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116 | *
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117 | * @returns Pointer to the allocated memory.
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118 | * @returns NULL on failure.
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119 | * @param cb Size in bytes of the memory block to allocated.
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120 | */
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121 | RTDECL(void *) RTMemAlloc(size_t cb)
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122 | {
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123 | PRTMEMHDR pHdr = rtMemAlloc(cb + RTR0MEM_FENCE_EXTRA, 0);
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124 | if (pHdr)
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125 | {
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126 | #ifdef RTR0MEM_STRICT
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127 | pHdr->cbReq = cb;
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128 | memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
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129 | #endif
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130 | return pHdr + 1;
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131 | }
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132 | return NULL;
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133 | }
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134 |
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135 |
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136 | /**
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137 | * Allocates zero'ed memory.
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138 | *
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139 | * Instead of memset(pv, 0, sizeof()) use this when you want zero'ed
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140 | * memory. This keeps the code smaller and the heap can skip the memset
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141 | * in about 0.42% of calls :-).
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142 | *
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143 | * @returns Pointer to the allocated memory.
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144 | * @returns NULL on failure.
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145 | * @param cb Size in bytes of the memory block to allocated.
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146 | */
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147 | RTDECL(void *) RTMemAllocZ(size_t cb)
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148 | {
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149 | PRTMEMHDR pHdr = rtMemAlloc(cb + RTR0MEM_FENCE_EXTRA, RTMEMHDR_FLAG_ZEROED);
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150 | if (pHdr)
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151 | {
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152 | #ifdef RTR0MEM_STRICT
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153 | pHdr->cbReq = cb;
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154 | memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
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155 | return memset(pHdr + 1, 0, cb);
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156 | #else
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157 | return memset(pHdr + 1, 0, pHdr->cb);
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158 | #endif
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159 | }
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160 | return NULL;
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161 | }
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162 |
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163 |
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164 | /**
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165 | * Reallocates memory.
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166 | *
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167 | * @returns Pointer to the allocated memory.
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168 | * @returns NULL on failure.
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169 | * @param pvOld The memory block to reallocate.
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170 | * @param cbNew The new block size (in bytes).
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171 | */
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172 | RTDECL(void *) RTMemRealloc(void *pvOld, size_t cbNew)
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173 | {
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174 | if (!cbNew)
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175 | RTMemFree(pvOld);
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176 | else if (!pvOld)
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177 | return RTMemAlloc(cbNew);
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178 | else
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179 | {
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180 | PRTMEMHDR pHdrOld = (PRTMEMHDR)pvOld - 1;
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181 | if (pHdrOld->u32Magic == RTMEMHDR_MAGIC)
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182 | {
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183 | PRTMEMHDR pHdrNew;
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184 | if (pHdrOld->cb >= cbNew && pHdrOld->cb - cbNew <= 128)
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185 | return pvOld;
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186 | pHdrNew = rtMemAlloc(cbNew + RTR0MEM_FENCE_EXTRA, 0);
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187 | if (pHdrNew)
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188 | {
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189 | size_t cbCopy = RT_MIN(pHdrOld->cb, pHdrNew->cb);
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190 | memcpy(pHdrNew + 1, pvOld, cbCopy);
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191 | #ifdef RTR0MEM_STRICT
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192 | pHdrNew->cbReq = cbNew;
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193 | memcpy((uint8_t *)(pHdrNew + 1) + cbNew, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
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194 | AssertReleaseMsg(!memcmp((uint8_t *)(pHdrOld + 1) + pHdrOld->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
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195 | ("pHdr=%p pvOld=%p cb=%zu cbNew=%zu\n"
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196 | "fence: %.*Rhxs\n"
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197 | "expected: %.*Rhxs\n",
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198 | pHdrOld, pvOld, pHdrOld->cb, cbNew,
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199 | RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdrOld + 1) + pHdrOld->cb,
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200 | RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
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201 | #endif
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202 | rtMemFree(pHdrOld);
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203 | return pHdrNew + 1;
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204 | }
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205 | }
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206 | else
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207 | AssertMsgFailed(("pHdrOld->u32Magic=%RX32 pvOld=%p cbNew=%#zx\n", pHdrOld->u32Magic, pvOld, cbNew));
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208 | }
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209 |
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210 | return NULL;
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211 | }
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212 |
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213 |
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214 | /**
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215 | * Free memory related to an virtual machine
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216 | *
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217 | * @param pv Pointer to memory block.
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218 | */
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219 | RTDECL(void) RTMemFree(void *pv)
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220 | {
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221 | PRTMEMHDR pHdr;
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222 | if (!pv)
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223 | return;
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224 | pHdr = (PRTMEMHDR)pv - 1;
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225 | if (pHdr->u32Magic == RTMEMHDR_MAGIC)
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226 | {
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227 | Assert(!(pHdr->fFlags & RTMEMHDR_FLAG_EXEC));
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228 | #ifdef RTR0MEM_STRICT
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229 | AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
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230 | ("pHdr=%p pv=%p cb=%zu\n"
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231 | "fence: %.*Rhxs\n"
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232 | "expected: %.*Rhxs\n",
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233 | pHdr, pv, pHdr->cb, pv,
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234 | RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cb,
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235 | RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
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236 | #endif
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237 | rtMemFree(pHdr);
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238 | }
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239 | else
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240 | AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
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241 | }
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242 |
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243 |
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244 | /**
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245 | * Allocates memory which may contain code.
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246 | *
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247 | * @returns Pointer to the allocated memory.
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248 | * @returns NULL on failure.
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249 | * @param cb Size in bytes of the memory block to allocate.
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250 | */
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251 | RTDECL(void *) RTMemExecAlloc(size_t cb)
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252 | {
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253 | PRTMEMHDR pHdr = rtMemAlloc(cb + RTR0MEM_FENCE_EXTRA, RTMEMHDR_FLAG_EXEC);
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254 | if (pHdr)
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255 | {
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256 | #ifdef RTR0MEM_STRICT
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257 | pHdr->cbReq = cb;
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258 | memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
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259 | #endif
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260 | return pHdr + 1;
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261 | }
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262 | return NULL;
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263 | }
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264 |
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265 |
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266 | /**
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267 | * Free executable/read/write memory allocated by RTMemExecAlloc().
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268 | *
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269 | * @param pv Pointer to memory block.
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270 | */
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271 | RTDECL(void) RTMemExecFree(void *pv)
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272 | {
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273 | PRTMEMHDR pHdr;
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274 | if (!pv)
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275 | return;
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276 | pHdr = (PRTMEMHDR)pv - 1;
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277 | if (pHdr->u32Magic == RTMEMHDR_MAGIC)
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278 | {
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279 | #ifdef RTR0MEM_STRICT
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280 | AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
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281 | ("pHdr=%p pv=%p cb=%zu\n"
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282 | "fence: %.*Rhxs\n"
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283 | "expected: %.*Rhxs\n",
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284 | pHdr, pv, pHdr->cb,
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285 | RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cb,
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286 | RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
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287 | #endif
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288 | rtMemFree(pHdr);
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289 | }
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290 | else
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291 | AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
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292 | }
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293 |
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