1 | /* $Id: rtmempage-exec-mmap-posix.cpp 101142 2023-09-18 11:12:16Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - RTMemPage*, POSIX with mmap only.
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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 | #include "internal/iprt.h"
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42 | #include <iprt/mem.h>
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43 |
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44 | #include <iprt/asm.h>
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45 | #include <iprt/assert.h>
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46 | #include <iprt/errcore.h>
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47 | #include <iprt/param.h>
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48 | #include <iprt/string.h>
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49 | #include <iprt/system.h>
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50 |
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51 | #include <stdlib.h>
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52 | #include <errno.h>
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53 | #include <sys/mman.h>
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54 | #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
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55 | # define MAP_ANONYMOUS MAP_ANON
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56 | #endif
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57 |
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58 |
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59 | /**
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60 | * Applies flags to an allocation.
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61 | *
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62 | * @param pv The allocation.
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63 | * @param cb The size of the allocation (page aligned).
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64 | * @param fFlags RTMEMPAGEALLOC_F_XXX.
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65 | */
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66 | DECLINLINE(void) rtMemPagePosixApplyFlags(void *pv, size_t cb, uint32_t fFlags)
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67 | {
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68 | #ifndef RT_OS_OS2
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69 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
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70 | {
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71 | int rc = mlock(pv, cb);
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72 | # ifndef RT_OS_SOLARIS /* mlock(3C) on Solaris requires the priv_lock_memory privilege */
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73 | AssertMsg(rc == 0, ("mlock %p LB %#zx -> %d errno=%d\n", pv, cb, rc, errno));
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74 | # endif
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75 | NOREF(rc);
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76 | }
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77 |
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78 | # ifdef MADV_DONTDUMP
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79 | if (fFlags & RTMEMPAGEALLOC_F_ADVISE_NO_DUMP)
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80 | {
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81 | int rc = madvise(pv, cb, MADV_DONTDUMP);
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82 | AssertMsg(rc == 0, ("madvice %p LB %#zx MADV_DONTDUMP -> %d errno=%d\n", pv, cb, rc, errno));
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83 | NOREF(rc);
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84 | }
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85 | # endif
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86 | #endif
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87 |
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88 | if (fFlags & RTMEMPAGEALLOC_F_ZERO)
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89 | RT_BZERO(pv, cb);
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90 | }
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91 |
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92 |
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93 | /**
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94 | * Allocates memory from the specified heap.
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95 | *
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96 | * @returns Address of the allocated memory.
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97 | * @param cb The number of bytes to allocate.
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98 | * @param pszTag The tag.
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99 | * @param fFlags RTMEMPAGEALLOC_F_XXX.
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100 | * @param fProtExec PROT_EXEC or 0.
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101 | */
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102 | static void *rtMemPagePosixAlloc(size_t cb, const char *pszTag, uint32_t fFlags, int fProtExec)
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103 | {
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104 | /*
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105 | * Validate & adjust the input.
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106 | */
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107 | Assert(cb > 0);
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108 | NOREF(pszTag);
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109 | cb = RTSystemPageAlignSize(cb);
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110 |
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111 | /*
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112 | * Do the allocation.
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113 | */
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114 | void *pv = mmap(NULL, cb,
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115 | PROT_READ | PROT_WRITE | fProtExec,
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116 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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117 | if (pv != MAP_FAILED)
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118 | {
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119 | AssertPtr(pv);
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120 |
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121 | if (fFlags)
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122 | rtMemPagePosixApplyFlags(pv, cb, fFlags);
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123 | }
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124 | else
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125 | pv = NULL;
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126 |
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127 | return pv;
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128 | }
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129 |
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130 |
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131 | /**
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132 | * Free memory allocated by rtMemPagePosixAlloc.
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133 | *
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134 | * @param pv The address of the memory to free.
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135 | * @param cb The size.
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136 | */
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137 | static void rtMemPagePosixFree(void *pv, size_t cb)
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138 | {
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139 | /*
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140 | * Validate & adjust the input.
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141 | */
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142 | if (!pv)
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143 | return;
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144 | AssertPtr(pv);
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145 | Assert(cb > 0);
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146 | Assert(!((uintptr_t)pv & RTSystemGetPageOffsetMask()));
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147 | cb = RTSystemPageAlignSize(cb);
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148 |
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149 | /*
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150 | * Free the memory.
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151 | */
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152 | int rc = munmap(pv, cb);
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153 | AssertMsg(rc == 0, ("rc=%d pv=%p cb=%#zx\n", rc, pv, cb)); NOREF(rc);
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154 | }
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155 |
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156 |
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157 |
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158 |
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159 |
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160 | RTDECL(void *) RTMemPageAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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161 | {
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162 | return rtMemPagePosixAlloc(cb, pszTag, 0, 0);
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163 | }
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164 |
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165 |
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166 | RTDECL(void *) RTMemPageAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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167 | {
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168 | return rtMemPagePosixAlloc(cb, pszTag, RTMEMPAGEALLOC_F_ZERO, 0);
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169 | }
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170 |
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171 |
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172 | RTDECL(void *) RTMemPageAllocExTag(size_t cb, uint32_t fFlags, const char *pszTag) RT_NO_THROW_DEF
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173 | {
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174 | AssertReturn(!(fFlags & ~RTMEMPAGEALLOC_F_VALID_MASK), NULL);
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175 | return rtMemPagePosixAlloc(cb, pszTag, fFlags, !(fFlags & RTMEMPAGEALLOC_F_EXECUTABLE) ? 0 : PROT_EXEC);
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176 | }
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177 |
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178 |
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179 | RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW_DEF
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180 | {
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181 | return rtMemPagePosixFree(pv, cb);
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182 | }
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183 |
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