| 1 | /* $Id: alloc-posix.cpp 5999 2007-12-07 15:05:06Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * innotek Portable Runtime - Memory Allocation, POSIX.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2007 innotek GmbH
|
|---|
| 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 |
|
|---|
| 27 |
|
|---|
| 28 | /*******************************************************************************
|
|---|
| 29 | * Header Files *
|
|---|
| 30 | *******************************************************************************/
|
|---|
| 31 | #include <iprt/alloc.h>
|
|---|
| 32 | #include <iprt/assert.h>
|
|---|
| 33 | #include <iprt/param.h>
|
|---|
| 34 | #include <iprt/err.h>
|
|---|
| 35 | #include <iprt/string.h>
|
|---|
| 36 |
|
|---|
| 37 | #include <stdlib.h>
|
|---|
| 38 | #include <malloc.h>
|
|---|
| 39 | #include <errno.h>
|
|---|
| 40 | #include <sys/mman.h>
|
|---|
| 41 |
|
|---|
| 42 | #if !defined(RT_USE_MMAP) && (defined(RT_OS_LINUX))
|
|---|
| 43 | # define RT_USE_MMAP
|
|---|
| 44 | #endif
|
|---|
| 45 |
|
|---|
| 46 | /*******************************************************************************
|
|---|
| 47 | * Structures and Typedefs *
|
|---|
| 48 | *******************************************************************************/
|
|---|
| 49 | #ifdef RT_USE_MMAP
|
|---|
| 50 | /**
|
|---|
| 51 | * RTMemExecAlloc() header used when using mmap for allocating the memory.
|
|---|
| 52 | */
|
|---|
| 53 | typedef struct RTMEMEXECHDR
|
|---|
| 54 | {
|
|---|
| 55 | /** Magic number (RTMEMEXECHDR_MAGIC). */
|
|---|
| 56 | size_t uMagic;
|
|---|
| 57 | /** The size we requested from mmap. */
|
|---|
| 58 | size_t cb;
|
|---|
| 59 | # if ARCH_BITS == 32
|
|---|
| 60 | uint32_t Alignment[2];
|
|---|
| 61 | # endif
|
|---|
| 62 | } RTMEMEXECHDR, *PRTMEMEXECHDR;
|
|---|
| 63 |
|
|---|
| 64 | /** Magic for RTMEMEXECHDR. */
|
|---|
| 65 | #define RTMEMEXECHDR_MAGIC (~(size_t)0xfeedbabe)
|
|---|
| 66 |
|
|---|
| 67 | #endif /* RT_USE_MMAP */
|
|---|
| 68 |
|
|---|
| 69 |
|
|---|
| 70 |
|
|---|
| 71 | #ifdef IN_RING3
|
|---|
| 72 |
|
|---|
| 73 | /**
|
|---|
| 74 | * Allocates memory which may contain code.
|
|---|
| 75 | *
|
|---|
| 76 | * @returns Pointer to the allocated memory.
|
|---|
| 77 | * @returns NULL on failure.
|
|---|
| 78 | * @param cb Size in bytes of the memory block to allocate.
|
|---|
| 79 | */
|
|---|
| 80 | RTDECL(void *) RTMemExecAlloc(size_t cb)
|
|---|
| 81 | {
|
|---|
| 82 | AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
|
|---|
| 83 |
|
|---|
| 84 | #ifdef RT_USE_MMAP
|
|---|
| 85 | /*
|
|---|
| 86 | * Use mmap to get low memory.
|
|---|
| 87 | */
|
|---|
| 88 | size_t cbAlloc = RT_ALIGN_Z(cb + sizeof(RTMEMEXECHDR), PAGE_SIZE);
|
|---|
| 89 | void *pv = mmap(NULL, cbAlloc, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS
|
|---|
| 90 | #if defined(RT_ARCH_AMD64) && defined(MAP_32BIT)
|
|---|
| 91 | | MAP_32BIT
|
|---|
| 92 | #endif
|
|---|
| 93 | , -1, 0);
|
|---|
| 94 | AssertMsgReturn(pv != MAP_FAILED, ("errno=%d cb=%#zx\n", errno, cb), NULL);
|
|---|
| 95 | PRTMEMEXECHDR pHdr = (PRTMEMEXECHDR)pv;
|
|---|
| 96 | pHdr->uMagic = RTMEMEXECHDR_MAGIC;
|
|---|
| 97 | pHdr->cb = cbAlloc;
|
|---|
| 98 | pv = pHdr + 1;
|
|---|
| 99 |
|
|---|
| 100 | #else
|
|---|
| 101 | /*
|
|---|
| 102 | * Allocate first.
|
|---|
| 103 | */
|
|---|
| 104 | cb = RT_ALIGN_Z(cb, 32);
|
|---|
| 105 | void *pv = NULL;
|
|---|
| 106 | int rc = posix_memalign(&pv, 32, cb);
|
|---|
| 107 | AssertMsg(!rc && pv, ("posix_memalign(%zd) failed!!! rc=%d\n", cb, rc));
|
|---|
| 108 | if (pv && !rc)
|
|---|
| 109 | {
|
|---|
| 110 | /*
|
|---|
| 111 | * Add PROT_EXEC flag to the page.
|
|---|
| 112 | *
|
|---|
| 113 | * This is in violation of the SuS where I think it saith that mprotect() shall
|
|---|
| 114 | * only be used with mmap()'ed memory. Works on linux and OS/2 LIBC v0.6.
|
|---|
| 115 | */
|
|---|
| 116 | memset(pv, 0xcc, cb);
|
|---|
| 117 | void *pvProt = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
|
|---|
| 118 | size_t cbProt = ((uintptr_t)pv & PAGE_OFFSET_MASK) + cb;
|
|---|
| 119 | cbProt = RT_ALIGN_Z(cbProt, PAGE_SIZE);
|
|---|
| 120 | rc = mprotect(pvProt, cbProt, PROT_READ | PROT_WRITE | PROT_EXEC);
|
|---|
| 121 | if (rc)
|
|---|
| 122 | {
|
|---|
| 123 | AssertMsgFailed(("mprotect(%p, %#zx,,) -> rc=%d, errno=%d\n", pvProt, cbProt, rc, errno));
|
|---|
| 124 | free(pv);
|
|---|
| 125 | pv = NULL;
|
|---|
| 126 | }
|
|---|
| 127 | }
|
|---|
| 128 | #endif
|
|---|
| 129 | return pv;
|
|---|
| 130 | }
|
|---|
| 131 |
|
|---|
| 132 |
|
|---|
| 133 | /**
|
|---|
| 134 | * Free executable/read/write memory allocated by RTMemExecAlloc().
|
|---|
| 135 | *
|
|---|
| 136 | * @param pv Pointer to memory block.
|
|---|
| 137 | */
|
|---|
| 138 | RTDECL(void) RTMemExecFree(void *pv)
|
|---|
| 139 | {
|
|---|
| 140 | if (pv)
|
|---|
| 141 | {
|
|---|
| 142 | #ifdef RT_USE_MMAP
|
|---|
| 143 | PRTMEMEXECHDR pHdr = (PRTMEMEXECHDR)pv - 1;
|
|---|
| 144 | AssertMsgReturnVoid(RT_ALIGN_P(pHdr, PAGE_SIZE) == pHdr, ("pHdr=%p pv=%p\n", pHdr, pv));
|
|---|
| 145 | AssertMsgReturnVoid(pHdr->uMagic == RTMEMEXECHDR_MAGIC, ("pHdr=%p(uMagic=%#zx) pv=%p\n", pHdr, pHdr->uMagic, pv));
|
|---|
| 146 | int rc = munmap(pHdr, pHdr->cb);
|
|---|
| 147 | AssertMsg(!rc, ("munmap -> %d errno=%d\n", rc, errno)); NOREF(rc);
|
|---|
| 148 | #else
|
|---|
| 149 | free(pv);
|
|---|
| 150 | #endif
|
|---|
| 151 | }
|
|---|
| 152 | }
|
|---|
| 153 |
|
|---|
| 154 |
|
|---|
| 155 | /**
|
|---|
| 156 | * Allocate page aligned memory.
|
|---|
| 157 | *
|
|---|
| 158 | * @returns Pointer to the allocated memory.
|
|---|
| 159 | * @returns NULL if we're out of memory.
|
|---|
| 160 | * @param cb Size of the memory block. Will be rounded up to page size.
|
|---|
| 161 | */
|
|---|
| 162 | RTDECL(void *) RTMemPageAlloc(size_t cb)
|
|---|
| 163 | {
|
|---|
| 164 | #if 0 /** @todo huh? we're using posix_memalign in the next function... */
|
|---|
| 165 | void *pv;
|
|---|
| 166 | int rc = posix_memalign(&pv, PAGE_SIZE, RT_ALIGN_Z(cb, PAGE_SIZE));
|
|---|
| 167 | if (!rc)
|
|---|
| 168 | return pv;
|
|---|
| 169 | return NULL;
|
|---|
| 170 | #else
|
|---|
| 171 | return memalign(PAGE_SIZE, cb);
|
|---|
| 172 | #endif
|
|---|
| 173 | }
|
|---|
| 174 |
|
|---|
| 175 |
|
|---|
| 176 | /**
|
|---|
| 177 | * Allocate zero'ed page aligned memory.
|
|---|
| 178 | *
|
|---|
| 179 | * @returns Pointer to the allocated memory.
|
|---|
| 180 | * @returns NULL if we're out of memory.
|
|---|
| 181 | * @param cb Size of the memory block. Will be rounded up to page size.
|
|---|
| 182 | */
|
|---|
| 183 | RTDECL(void *) RTMemPageAllocZ(size_t cb)
|
|---|
| 184 | {
|
|---|
| 185 | void *pv;
|
|---|
| 186 | int rc = posix_memalign(&pv, PAGE_SIZE, RT_ALIGN_Z(cb, PAGE_SIZE));
|
|---|
| 187 | if (!rc)
|
|---|
| 188 | {
|
|---|
| 189 | bzero(pv, RT_ALIGN_Z(cb, PAGE_SIZE));
|
|---|
| 190 | return pv;
|
|---|
| 191 | }
|
|---|
| 192 | return NULL;
|
|---|
| 193 | }
|
|---|
| 194 |
|
|---|
| 195 |
|
|---|
| 196 | /**
|
|---|
| 197 | * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
|
|---|
| 198 | *
|
|---|
| 199 | * @param pv Pointer to the block as it was returned by the allocation function.
|
|---|
| 200 | * NULL will be ignored.
|
|---|
| 201 | */
|
|---|
| 202 | RTDECL(void) RTMemPageFree(void *pv)
|
|---|
| 203 | {
|
|---|
| 204 | if (pv)
|
|---|
| 205 | free(pv);
|
|---|
| 206 | }
|
|---|
| 207 |
|
|---|
| 208 |
|
|---|
| 209 | /**
|
|---|
| 210 | * Change the page level protection of a memory region.
|
|---|
| 211 | *
|
|---|
| 212 | * @returns iprt status code.
|
|---|
| 213 | * @param pv Start of the region. Will be rounded down to nearest page boundary.
|
|---|
| 214 | * @param cb Size of the region. Will be rounded up to the nearest page boundary.
|
|---|
| 215 | * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
|
|---|
| 216 | */
|
|---|
| 217 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect)
|
|---|
| 218 | {
|
|---|
| 219 | /*
|
|---|
| 220 | * Validate input.
|
|---|
| 221 | */
|
|---|
| 222 | if (cb == 0)
|
|---|
| 223 | {
|
|---|
| 224 | AssertMsgFailed(("!cb\n"));
|
|---|
| 225 | return VERR_INVALID_PARAMETER;
|
|---|
| 226 | }
|
|---|
| 227 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
|
|---|
| 228 | {
|
|---|
| 229 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
|
|---|
| 230 | return VERR_INVALID_PARAMETER;
|
|---|
| 231 | }
|
|---|
| 232 |
|
|---|
| 233 | /*
|
|---|
| 234 | * Convert the flags.
|
|---|
| 235 | */
|
|---|
| 236 | int fProt;
|
|---|
| 237 | #if RTMEM_PROT_NONE == PROT_NONE \
|
|---|
| 238 | && RTMEM_PROT_READ == PROT_READ \
|
|---|
| 239 | && RTMEM_PROT_WRITE == PROT_WRITE \
|
|---|
| 240 | && RTMEM_PROT_EXEC == PROT_EXEC
|
|---|
| 241 | fProt = fProtect;
|
|---|
| 242 | #else
|
|---|
| 243 | Assert(!RTMEM_PROT_NONE);
|
|---|
| 244 | if (!fProtect)
|
|---|
| 245 | fProt = PROT_NONE;
|
|---|
| 246 | else
|
|---|
| 247 | {
|
|---|
| 248 | fProt = 0;
|
|---|
| 249 | if (fProtect & RTMEM_PROT_READ)
|
|---|
| 250 | fProt |= PROT_READ;
|
|---|
| 251 | if (fProtect & RTMEM_PROT_WRITE)
|
|---|
| 252 | fProt |= PROT_WRITE;
|
|---|
| 253 | if (fProtect & RTMEM_PROT_EXEC)
|
|---|
| 254 | fProt |= PROT_EXEC;
|
|---|
| 255 | }
|
|---|
| 256 | #endif
|
|---|
| 257 |
|
|---|
| 258 | /*
|
|---|
| 259 | * Align the request.
|
|---|
| 260 | */
|
|---|
| 261 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
|
|---|
| 262 | pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
|
|---|
| 263 |
|
|---|
| 264 | /*
|
|---|
| 265 | * Change the page attributes.
|
|---|
| 266 | */
|
|---|
| 267 | int rc = mprotect(pv, cb, fProt);
|
|---|
| 268 | if (!rc)
|
|---|
| 269 | return rc;
|
|---|
| 270 | return RTErrConvertFromErrno(errno);
|
|---|
| 271 | }
|
|---|
| 272 |
|
|---|
| 273 | #endif
|
|---|
