| 1 | /* $Id: alloc-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Memory Allocation, Windows.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #ifdef IPRT_NO_CRT
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| 42 | # define USE_VIRTUAL_ALLOC
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| 43 | #endif
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| 44 | #define LOG_GROUP RTLOGGROUP_MEM
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| 45 | #include <iprt/win/windows.h>
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| 46 |
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| 47 | #include <iprt/alloc.h>
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| 48 | #include <iprt/assert.h>
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| 49 | #include <iprt/param.h>
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| 50 | #include <iprt/string.h>
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| 51 | #include <iprt/errcore.h>
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| 52 |
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| 53 | #ifndef USE_VIRTUAL_ALLOC
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| 54 | # include <malloc.h>
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| 55 | #endif
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| 56 |
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| 57 |
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| 58 | RTDECL(void *) RTMemPageAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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| 59 | {
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| 60 | RT_NOREF_PV(pszTag);
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| 61 |
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| 62 | #ifdef USE_VIRTUAL_ALLOC
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| 63 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
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| 64 | #else
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| 65 | void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE);
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| 66 | #endif
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| 67 | AssertMsg(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()));
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| 68 | return pv;
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| 69 | }
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| 70 |
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| 71 |
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| 72 | RTDECL(void *) RTMemPageAllocExTag(size_t cb, uint32_t fFlags, const char *pszTag) RT_NO_THROW_DEF
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| 73 | {
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| 74 | size_t const cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
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| 75 | RT_NOREF_PV(pszTag);
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| 76 | AssertReturn(!(fFlags & ~RTMEMPAGEALLOC_F_VALID_MASK), NULL);
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| 77 |
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| 78 | #ifdef USE_VIRTUAL_ALLOC
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| 79 | void *pv = VirtualAlloc(NULL, cbAligned, MEM_COMMIT, PAGE_READWRITE);
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| 80 | #else
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| 81 | void *pv = _aligned_malloc(cbAligned, PAGE_SIZE);
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| 82 | #endif
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| 83 | AssertMsgReturn(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()), NULL);
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| 84 |
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| 85 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
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| 86 | {
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| 87 | /** @todo check why we get ERROR_WORKING_SET_QUOTA here. */
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| 88 | BOOL const fOkay = VirtualLock(pv, cbAligned);
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| 89 | AssertMsg(fOkay || GetLastError() == ERROR_WORKING_SET_QUOTA, ("pv=%p cb=%d lasterr=%d\n", pv, cb, GetLastError()));
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| 90 | NOREF(fOkay);
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| 91 | }
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| 92 |
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| 93 | if (fFlags & RTMEMPAGEALLOC_F_ZERO)
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| 94 | RT_BZERO(pv, cbAligned);
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| 95 |
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| 96 | return pv;
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| 97 | }
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| 98 |
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| 99 |
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| 100 | RTDECL(void *) RTMemPageAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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| 101 | {
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| 102 | RT_NOREF_PV(pszTag);
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| 103 |
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| 104 | #ifdef USE_VIRTUAL_ALLOC
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| 105 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
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| 106 | #else
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| 107 | void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE);
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| 108 | #endif
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| 109 | if (pv)
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| 110 | {
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| 111 | memset(pv, 0, RT_ALIGN_Z(cb, PAGE_SIZE));
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| 112 | return pv;
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| 113 | }
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| 114 | AssertMsgFailed(("cb=%d lasterr=%d\n", cb, GetLastError()));
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| 115 | return NULL;
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| 116 | }
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| 117 |
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| 118 |
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| 119 | RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW_DEF
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| 120 | {
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| 121 | RT_NOREF_PV(cb);
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| 122 |
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| 123 | if (pv)
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| 124 | {
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| 125 | #ifdef USE_VIRTUAL_ALLOC
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| 126 | if (!VirtualFree(pv, 0, MEM_RELEASE))
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| 127 | AssertMsgFailed(("pv=%p lasterr=%d\n", pv, GetLastError()));
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| 128 | #else
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| 129 | _aligned_free(pv);
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| 130 | #endif
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| 131 | }
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| 132 | }
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| 133 |
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| 134 |
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| 135 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW_DEF
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| 136 | {
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| 137 | /*
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| 138 | * Validate input.
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| 139 | */
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| 140 | if (cb == 0)
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| 141 | {
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| 142 | AssertMsgFailed(("!cb\n"));
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| 143 | return VERR_INVALID_PARAMETER;
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| 144 | }
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| 145 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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| 146 | {
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| 147 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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| 148 | return VERR_INVALID_PARAMETER;
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| 149 | }
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| 150 |
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| 151 | /*
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| 152 | * Convert the flags.
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| 153 | */
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| 154 | int fProt;
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| 155 | Assert(!RTMEM_PROT_NONE);
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| 156 | switch (fProtect & (RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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| 157 | {
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| 158 | case RTMEM_PROT_NONE:
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| 159 | fProt = PAGE_NOACCESS;
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| 160 | break;
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| 161 |
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| 162 | case RTMEM_PROT_READ:
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| 163 | fProt = PAGE_READONLY;
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| 164 | break;
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| 165 |
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| 166 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE:
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| 167 | fProt = PAGE_READWRITE;
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| 168 | break;
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| 169 |
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| 170 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
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| 171 | fProt = PAGE_EXECUTE_READWRITE;
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| 172 | break;
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| 173 |
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| 174 | case RTMEM_PROT_READ | RTMEM_PROT_EXEC:
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| 175 | fProt = PAGE_EXECUTE_READWRITE;
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| 176 | break;
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| 177 |
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| 178 | case RTMEM_PROT_WRITE:
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| 179 | fProt = PAGE_READWRITE;
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| 180 | break;
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| 181 |
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| 182 | case RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
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| 183 | fProt = PAGE_EXECUTE_READWRITE;
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| 184 | break;
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| 185 |
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| 186 | case RTMEM_PROT_EXEC:
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| 187 | fProt = PAGE_EXECUTE_READWRITE;
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| 188 | break;
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| 189 |
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| 190 | /* If the compiler had any brains it would warn about this case. */
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| 191 | default:
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| 192 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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| 193 | return VERR_INTERNAL_ERROR;
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| 194 | }
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| 195 |
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| 196 | /*
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| 197 | * Align the request.
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| 198 | */
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| 199 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
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| 200 | pv = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
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| 201 |
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| 202 | /*
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| 203 | * Change the page attributes.
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| 204 | */
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| 205 | DWORD fFlags = 0;
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| 206 | if (VirtualProtect(pv, cb, fProt, &fFlags))
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| 207 | return VINF_SUCCESS;
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| 208 | return RTErrConvertFromWin32(GetLastError());
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| 209 | }
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| 210 |
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