| 1 | /* $Id: alloc-win.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Memory Allocation, Win32.
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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 | #define LOG_GROUP RTLOGGROUP_MEM
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| 36 | #include <Windows.h>
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| 37 |
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| 38 | #include <iprt/alloc.h>
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| 39 | #include <iprt/assert.h>
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| 40 | #include <iprt/param.h>
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| 41 | #include <iprt/string.h>
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| 42 | #include <iprt/err.h>
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| 43 |
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| 44 | #ifndef USE_VIRTUAL_ALLOC
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| 45 | # include <malloc.h>
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| 46 | #endif
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| 47 |
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| 48 |
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| 49 | /**
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| 50 | * Allocates memory which may contain code.
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| 51 | *
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| 52 | * @returns Pointer to the allocated memory.
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| 53 | * @returns NULL on failure.
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| 54 | * @param cb Size in bytes of the memory block to allocate.
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| 55 | */
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| 56 | RTDECL(void *) RTMemExecAlloc(size_t cb)
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| 57 | {
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| 58 | /*
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| 59 | * Allocate first.
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| 60 | */
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| 61 | AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
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| 62 | cb = RT_ALIGN_Z(cb, 32);
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| 63 | void *pv = malloc(cb);
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| 64 | AssertMsg(pv, ("malloc(%d) failed!!!\n", cb));
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| 65 | if (pv)
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| 66 | {
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| 67 | /*
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| 68 | * Add PROT_EXEC flag to the page.
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| 69 | *
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| 70 | * This is in violation of the SuS where I think it saith that mprotect() shall
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| 71 | * only be used with mmap()'ed memory. Works on linux and OS/2 LIBC v0.6.
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| 72 | */
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| 73 | memset(pv, 0xcc, cb);
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| 74 | void *pvProt = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
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| 75 | size_t cbProt = ((uintptr_t)pv & PAGE_OFFSET_MASK) + cb;
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| 76 | cbProt = RT_ALIGN_Z(cbProt, PAGE_SIZE);
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| 77 | DWORD fFlags = 0;
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| 78 | if (!VirtualProtect(pvProt, cbProt, PAGE_EXECUTE_READWRITE, &fFlags))
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| 79 | {
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| 80 | AssertMsgFailed(("VirtualProtect(%p, %#x,,) -> lasterr=%d\n", pvProt, cbProt, GetLastError()));
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| 81 | free(pv);
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| 82 | pv = NULL;
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| 83 | }
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| 84 | }
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| 85 | return pv;
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| 86 | }
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| 87 |
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| 88 |
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| 89 | /**
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| 90 | * Free executable/read/write memory allocated by RTMemExecAlloc().
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| 91 | *
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| 92 | * @param pv Pointer to memory block.
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| 93 | */
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| 94 | RTDECL(void) RTMemExecFree(void *pv)
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| 95 | {
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| 96 | if (pv)
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| 97 | free(pv);
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| 98 | }
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| 99 |
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| 100 |
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| 101 | /**
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| 102 | * Allocate page aligned memory.
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| 103 | *
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| 104 | * @returns Pointer to the allocated memory.
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| 105 | * @returns NULL if we're out of memory.
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| 106 | * @param cb Size of the memory block. Will be rounded up to page size.
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| 107 | */
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| 108 | RTDECL(void *) RTMemPageAlloc(size_t cb)
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| 109 | {
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| 110 | #ifdef USE_VIRTUAL_ALLOC
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| 111 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
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| 112 | #else
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| 113 | void *pv = _aligned_malloc(cb, PAGE_SIZE);
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| 114 | #endif
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| 115 | AssertMsg(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()));
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| 116 | return pv;
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| 117 | }
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| 118 |
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| 119 |
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| 120 | /**
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| 121 | * Allocate zero'ed page aligned memory.
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| 122 | *
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| 123 | * @returns Pointer to the allocated memory.
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| 124 | * @returns NULL if we're out of memory.
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| 125 | * @param cb Size of the memory block. Will be rounded up to page size.
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| 126 | */
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| 127 | RTDECL(void *) RTMemPageAllocZ(size_t cb)
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| 128 | {
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| 129 | #ifdef USE_VIRTUAL_ALLOC
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| 130 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
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| 131 | #else
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| 132 | void *pv = _aligned_malloc(cb, PAGE_SIZE);
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| 133 | #endif
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| 134 | if (pv)
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| 135 | {
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| 136 | memset(pv, 0, RT_ALIGN_Z(cb, PAGE_SIZE));
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| 137 | return pv;
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| 138 | }
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| 139 | AssertMsgFailed(("cb=%d lasterr=%d\n", cb, GetLastError()));
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| 140 | return NULL;
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| 141 | }
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| 142 |
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| 143 |
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| 144 | /**
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| 145 | * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
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| 146 | *
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| 147 | * @param pv Pointer to the block as it was returned by the allocation function.
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| 148 | * NULL will be ignored.
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| 149 | */
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| 150 | RTDECL(void) RTMemPageFree(void *pv)
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| 151 | {
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| 152 | if (pv)
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| 153 | {
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| 154 | #ifdef USE_VIRTUAL_ALLOC
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| 155 | if (!VirtualFree(pv, 0, MEM_RELEASE))
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| 156 | AssertMsgFailed(("pv=%p lasterr=%d\n", pv, GetLastError()));
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| 157 | #else
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| 158 | _aligned_free(pv);
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| 159 | #endif
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| 160 | }
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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 | * Change the page level protection of a memory region.
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| 166 | *
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| 167 | * @returns iprt status code.
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| 168 | * @param pv Start of the region. Will be rounded down to nearest page boundary.
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| 169 | * @param cb Size of the region. Will be rounded up to the nearest page boundary.
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| 170 | * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
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| 171 | */
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| 172 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect)
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| 173 | {
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| 174 | /*
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| 175 | * Validate input.
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| 176 | */
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| 177 | if (cb == 0)
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| 178 | {
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| 179 | AssertMsgFailed(("!cb\n"));
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| 180 | return VERR_INVALID_PARAMETER;
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| 181 | }
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| 182 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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| 183 | {
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| 184 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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| 185 | return VERR_INVALID_PARAMETER;
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| 186 | }
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| 187 |
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| 188 | /*
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| 189 | * Convert the flags.
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| 190 | */
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| 191 | int fProt;
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| 192 | Assert(!RTMEM_PROT_NONE);
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| 193 | switch (fProtect & (RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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| 194 | {
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| 195 | case RTMEM_PROT_NONE:
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| 196 | fProt = PAGE_NOACCESS;
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| 197 | break;
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| 198 |
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| 199 | case RTMEM_PROT_READ:
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| 200 | fProt = PAGE_READONLY;
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| 201 | break;
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| 202 |
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| 203 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE:
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| 204 | fProt = PAGE_READWRITE;
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| 205 | break;
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| 206 |
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| 207 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
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| 208 | fProt = PAGE_EXECUTE_READWRITE;
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| 209 | break;
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| 210 |
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| 211 | case RTMEM_PROT_READ | RTMEM_PROT_EXEC:
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| 212 | fProt = PAGE_EXECUTE_READWRITE;
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| 213 | break;
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| 214 |
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| 215 | case RTMEM_PROT_WRITE:
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| 216 | fProt = PAGE_READWRITE;
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| 217 | break;
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| 218 |
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| 219 | case RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
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| 220 | fProt = PAGE_EXECUTE_READWRITE;
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| 221 | break;
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| 222 |
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| 223 | case RTMEM_PROT_EXEC:
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| 224 | fProt = PAGE_EXECUTE_READWRITE;
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| 225 | break;
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| 226 |
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| 227 | /* If the compiler had any brains it would warn about this case. */
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| 228 | default:
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| 229 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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| 230 | return VERR_INTERNAL_ERROR;
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| 231 | }
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| 232 |
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| 233 | /*
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| 234 | * Align the request.
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| 235 | */
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| 236 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
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| 237 | pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
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| 238 |
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| 239 | /*
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| 240 | * Change the page attributes.
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| 241 | */
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| 242 | DWORD fFlags = 0;
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| 243 | if (VirtualProtect(pv, cb, fProt, &fFlags))
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| 244 | return VINF_SUCCESS;
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| 245 | return RTErrConvertFromWin32(GetLastError());
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| 246 | }
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| 247 |
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