| 1 | /* $Id: alloc-r0drv.cpp 14743 2008-11-27 21:17:06Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - Memory Allocation, Ring-0 Driver.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | *
|
|---|
| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
|
|---|
| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
|
|---|
| 28 | * additional information or have any questions.
|
|---|
| 29 | */
|
|---|
| 30 |
|
|---|
| 31 |
|
|---|
| 32 | /*******************************************************************************
|
|---|
| 33 | * Header Files *
|
|---|
| 34 | *******************************************************************************/
|
|---|
| 35 | #include <iprt/string.h>
|
|---|
| 36 | #include <iprt/alloc.h>
|
|---|
| 37 | #include <iprt/assert.h>
|
|---|
| 38 | #include <iprt/param.h>
|
|---|
| 39 | #include "r0drv/alloc-r0drv.h"
|
|---|
| 40 |
|
|---|
| 41 |
|
|---|
| 42 | /*******************************************************************************
|
|---|
| 43 | * Defined Constants And Macros *
|
|---|
| 44 | *******************************************************************************/
|
|---|
| 45 | #ifdef RT_STRICT
|
|---|
| 46 | # define RTR0MEM_STRICT
|
|---|
| 47 | #endif
|
|---|
| 48 |
|
|---|
| 49 | #ifdef RTR0MEM_STRICT
|
|---|
| 50 | # define RTR0MEM_FENCE_EXTRA 16
|
|---|
| 51 | #else
|
|---|
| 52 | # define RTR0MEM_FENCE_EXTRA 0
|
|---|
| 53 | #endif
|
|---|
| 54 |
|
|---|
| 55 |
|
|---|
| 56 | /*******************************************************************************
|
|---|
| 57 | * Global Variables *
|
|---|
| 58 | *******************************************************************************/
|
|---|
| 59 | #ifdef RTR0MEM_STRICT
|
|---|
| 60 | /** Fence data. */
|
|---|
| 61 | static uint8_t const g_abFence[RTR0MEM_FENCE_EXTRA] =
|
|---|
| 62 | {
|
|---|
| 63 | 0x77, 0x88, 0x66, 0x99, 0x55, 0xaa, 0x44, 0xbb,
|
|---|
| 64 | 0x33, 0xcc, 0x22, 0xdd, 0x11, 0xee, 0x00, 0xff
|
|---|
| 65 | };
|
|---|
| 66 | #endif
|
|---|
| 67 |
|
|---|
| 68 |
|
|---|
| 69 |
|
|---|
| 70 | /**
|
|---|
| 71 | * Allocates temporary memory.
|
|---|
| 72 | *
|
|---|
| 73 | * Temporary memory blocks are used for not too large memory blocks which
|
|---|
| 74 | * are believed not to stick around for too long. Using this API instead
|
|---|
| 75 | * of RTMemAlloc() not only gives the heap manager room for optimization
|
|---|
| 76 | * but makes the code easier to read.
|
|---|
| 77 | *
|
|---|
| 78 | * @returns Pointer to the allocated memory.
|
|---|
| 79 | * @returns NULL on failure.
|
|---|
| 80 | * @param cb Size in bytes of the memory block to allocated.
|
|---|
| 81 | */
|
|---|
| 82 | RTDECL(void *) RTMemTmpAlloc(size_t cb) RT_NO_THROW
|
|---|
| 83 | {
|
|---|
| 84 | return RTMemAlloc(cb);
|
|---|
| 85 | }
|
|---|
| 86 |
|
|---|
| 87 |
|
|---|
| 88 | /**
|
|---|
| 89 | * Allocates zero'ed temporary memory.
|
|---|
| 90 | *
|
|---|
| 91 | * Same as RTMemTmpAlloc() but the memory will be zero'ed.
|
|---|
| 92 | *
|
|---|
| 93 | * @returns Pointer to the allocated memory.
|
|---|
| 94 | * @returns NULL on failure.
|
|---|
| 95 | * @param cb Size in bytes of the memory block to allocated.
|
|---|
| 96 | */
|
|---|
| 97 | RTDECL(void *) RTMemTmpAllocZ(size_t cb) RT_NO_THROW
|
|---|
| 98 | {
|
|---|
| 99 | return RTMemAllocZ(cb);
|
|---|
| 100 | }
|
|---|
| 101 |
|
|---|
| 102 |
|
|---|
| 103 | /**
|
|---|
| 104 | * Free temporary memory.
|
|---|
| 105 | *
|
|---|
| 106 | * @param pv Pointer to memory block.
|
|---|
| 107 | */
|
|---|
| 108 | RTDECL(void) RTMemTmpFree(void *pv) RT_NO_THROW
|
|---|
| 109 | {
|
|---|
| 110 | return RTMemFree(pv);
|
|---|
| 111 | }
|
|---|
| 112 |
|
|---|
| 113 |
|
|---|
| 114 | /**
|
|---|
| 115 | * Allocates memory.
|
|---|
| 116 | *
|
|---|
| 117 | * @returns Pointer to the allocated memory.
|
|---|
| 118 | * @returns NULL on failure.
|
|---|
| 119 | * @param cb Size in bytes of the memory block to allocated.
|
|---|
| 120 | */
|
|---|
| 121 | RTDECL(void *) RTMemAlloc(size_t cb) RT_NO_THROW
|
|---|
| 122 | {
|
|---|
| 123 | PRTMEMHDR pHdr = rtMemAlloc(cb + RTR0MEM_FENCE_EXTRA, 0);
|
|---|
| 124 | if (pHdr)
|
|---|
| 125 | {
|
|---|
| 126 | #ifdef RTR0MEM_STRICT
|
|---|
| 127 | pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
|
|---|
| 128 | memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
|
|---|
| 129 | #endif
|
|---|
| 130 | return pHdr + 1;
|
|---|
| 131 | }
|
|---|
| 132 | return NULL;
|
|---|
| 133 | }
|
|---|
| 134 |
|
|---|
| 135 |
|
|---|
| 136 | /**
|
|---|
| 137 | * Allocates zero'ed memory.
|
|---|
| 138 | *
|
|---|
| 139 | * Instead of memset(pv, 0, sizeof()) use this when you want zero'ed
|
|---|
| 140 | * memory. This keeps the code smaller and the heap can skip the memset
|
|---|
| 141 | * in about 0.42% of calls :-).
|
|---|
| 142 | *
|
|---|
| 143 | * @returns Pointer to the allocated memory.
|
|---|
| 144 | * @returns NULL on failure.
|
|---|
| 145 | * @param cb Size in bytes of the memory block to allocated.
|
|---|
| 146 | */
|
|---|
| 147 | RTDECL(void *) RTMemAllocZ(size_t cb) RT_NO_THROW
|
|---|
| 148 | {
|
|---|
| 149 | PRTMEMHDR pHdr = rtMemAlloc(cb + RTR0MEM_FENCE_EXTRA, RTMEMHDR_FLAG_ZEROED);
|
|---|
| 150 | if (pHdr)
|
|---|
| 151 | {
|
|---|
| 152 | #ifdef RTR0MEM_STRICT
|
|---|
| 153 | pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
|
|---|
| 154 | memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
|
|---|
| 155 | return memset(pHdr + 1, 0, cb);
|
|---|
| 156 | #else
|
|---|
| 157 | return memset(pHdr + 1, 0, pHdr->cb);
|
|---|
| 158 | #endif
|
|---|
| 159 | }
|
|---|
| 160 | return NULL;
|
|---|
| 161 | }
|
|---|
| 162 |
|
|---|
| 163 |
|
|---|
| 164 | /**
|
|---|
| 165 | * Reallocates memory.
|
|---|
| 166 | *
|
|---|
| 167 | * @returns Pointer to the allocated memory.
|
|---|
| 168 | * @returns NULL on failure.
|
|---|
| 169 | * @param pvOld The memory block to reallocate.
|
|---|
| 170 | * @param cbNew The new block size (in bytes).
|
|---|
| 171 | */
|
|---|
| 172 | RTDECL(void *) RTMemRealloc(void *pvOld, size_t cbNew) RT_NO_THROW
|
|---|
| 173 | {
|
|---|
| 174 | if (!cbNew)
|
|---|
| 175 | RTMemFree(pvOld);
|
|---|
| 176 | else if (!pvOld)
|
|---|
| 177 | return RTMemAlloc(cbNew);
|
|---|
| 178 | else
|
|---|
| 179 | {
|
|---|
| 180 | PRTMEMHDR pHdrOld = (PRTMEMHDR)pvOld - 1;
|
|---|
| 181 | if (pHdrOld->u32Magic == RTMEMHDR_MAGIC)
|
|---|
| 182 | {
|
|---|
| 183 | PRTMEMHDR pHdrNew;
|
|---|
| 184 | if (pHdrOld->cb >= cbNew && pHdrOld->cb - cbNew <= 128)
|
|---|
| 185 | return pvOld;
|
|---|
| 186 | pHdrNew = rtMemAlloc(cbNew + RTR0MEM_FENCE_EXTRA, 0);
|
|---|
| 187 | if (pHdrNew)
|
|---|
| 188 | {
|
|---|
| 189 | size_t cbCopy = RT_MIN(pHdrOld->cb, pHdrNew->cb);
|
|---|
| 190 | memcpy(pHdrNew + 1, pvOld, cbCopy);
|
|---|
| 191 | #ifdef RTR0MEM_STRICT
|
|---|
| 192 | pHdrNew->cbReq = (uint32_t)cbNew; Assert(pHdrNew->cbReq == cbNew);
|
|---|
| 193 | memcpy((uint8_t *)(pHdrNew + 1) + cbNew, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
|
|---|
| 194 | AssertReleaseMsg(!memcmp((uint8_t *)(pHdrOld + 1) + pHdrOld->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
|
|---|
| 195 | ("pHdr=%p pvOld=%p cb=%zu cbNew=%zu\n"
|
|---|
| 196 | "fence: %.*Rhxs\n"
|
|---|
| 197 | "expected: %.*Rhxs\n",
|
|---|
| 198 | pHdrOld, pvOld, pHdrOld->cb, cbNew,
|
|---|
| 199 | RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdrOld + 1) + pHdrOld->cb,
|
|---|
| 200 | RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
|
|---|
| 201 | #endif
|
|---|
| 202 | rtMemFree(pHdrOld);
|
|---|
| 203 | return pHdrNew + 1;
|
|---|
| 204 | }
|
|---|
| 205 | }
|
|---|
| 206 | else
|
|---|
| 207 | AssertMsgFailed(("pHdrOld->u32Magic=%RX32 pvOld=%p cbNew=%#zx\n", pHdrOld->u32Magic, pvOld, cbNew));
|
|---|
| 208 | }
|
|---|
| 209 |
|
|---|
| 210 | return NULL;
|
|---|
| 211 | }
|
|---|
| 212 |
|
|---|
| 213 |
|
|---|
| 214 | /**
|
|---|
| 215 | * Free memory related to an virtual machine
|
|---|
| 216 | *
|
|---|
| 217 | * @param pv Pointer to memory block.
|
|---|
| 218 | */
|
|---|
| 219 | RTDECL(void) RTMemFree(void *pv) RT_NO_THROW
|
|---|
| 220 | {
|
|---|
| 221 | PRTMEMHDR pHdr;
|
|---|
| 222 | if (!pv)
|
|---|
| 223 | return;
|
|---|
| 224 | pHdr = (PRTMEMHDR)pv - 1;
|
|---|
| 225 | if (pHdr->u32Magic == RTMEMHDR_MAGIC)
|
|---|
| 226 | {
|
|---|
| 227 | Assert(!(pHdr->fFlags & RTMEMHDR_FLAG_EXEC));
|
|---|
| 228 | #ifdef RTR0MEM_STRICT
|
|---|
| 229 | AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
|
|---|
| 230 | ("pHdr=%p pv=%p cb=%zu\n"
|
|---|
| 231 | "fence: %.*Rhxs\n"
|
|---|
| 232 | "expected: %.*Rhxs\n",
|
|---|
| 233 | pHdr, pv, pHdr->cb,
|
|---|
| 234 | RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cb,
|
|---|
| 235 | RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
|
|---|
| 236 | #endif
|
|---|
| 237 | rtMemFree(pHdr);
|
|---|
| 238 | }
|
|---|
| 239 | else
|
|---|
| 240 | AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
|
|---|
| 241 | }
|
|---|
| 242 |
|
|---|
| 243 |
|
|---|
| 244 | /**
|
|---|
| 245 | * Allocates memory which may contain code.
|
|---|
| 246 | *
|
|---|
| 247 | * @returns Pointer to the allocated memory.
|
|---|
| 248 | * @returns NULL on failure.
|
|---|
| 249 | * @param cb Size in bytes of the memory block to allocate.
|
|---|
| 250 | */
|
|---|
| 251 | RTDECL(void *) RTMemExecAlloc(size_t cb) RT_NO_THROW
|
|---|
| 252 | {
|
|---|
| 253 | PRTMEMHDR pHdr = rtMemAlloc(cb + RTR0MEM_FENCE_EXTRA, RTMEMHDR_FLAG_EXEC);
|
|---|
| 254 | if (pHdr)
|
|---|
| 255 | {
|
|---|
| 256 | #ifdef RTR0MEM_STRICT
|
|---|
| 257 | pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
|
|---|
| 258 | memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
|
|---|
| 259 | #endif
|
|---|
| 260 | return pHdr + 1;
|
|---|
| 261 | }
|
|---|
| 262 | return NULL;
|
|---|
| 263 | }
|
|---|
| 264 |
|
|---|
| 265 |
|
|---|
| 266 | /**
|
|---|
| 267 | * Free executable/read/write memory allocated by RTMemExecAlloc().
|
|---|
| 268 | *
|
|---|
| 269 | * @param pv Pointer to memory block.
|
|---|
| 270 | */
|
|---|
| 271 | RTDECL(void) RTMemExecFree(void *pv) RT_NO_THROW
|
|---|
| 272 | {
|
|---|
| 273 | PRTMEMHDR pHdr;
|
|---|
| 274 | if (!pv)
|
|---|
| 275 | return;
|
|---|
| 276 | pHdr = (PRTMEMHDR)pv - 1;
|
|---|
| 277 | if (pHdr->u32Magic == RTMEMHDR_MAGIC)
|
|---|
| 278 | {
|
|---|
| 279 | #ifdef RTR0MEM_STRICT
|
|---|
| 280 | AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
|
|---|
| 281 | ("pHdr=%p pv=%p cb=%zu\n"
|
|---|
| 282 | "fence: %.*Rhxs\n"
|
|---|
| 283 | "expected: %.*Rhxs\n",
|
|---|
| 284 | pHdr, pv, pHdr->cb,
|
|---|
| 285 | RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cb,
|
|---|
| 286 | RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
|
|---|
| 287 | #endif
|
|---|
| 288 | rtMemFree(pHdr);
|
|---|
| 289 | }
|
|---|
| 290 | else
|
|---|
| 291 | AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
|
|---|
| 292 | }
|
|---|
| 293 |
|
|---|
