1 | /* $Id: rtmempage-exec-mmap-posix.cpp 69111 2017-10-17 14:26:02Z 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) 2006-2017 Oracle Corporation
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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 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include "internal/iprt.h"
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32 | #include <iprt/mem.h>
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33 |
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34 | #include <iprt/asm.h>
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35 | #include <iprt/assert.h>
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36 | #include <iprt/err.h>
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37 | #include <iprt/param.h>
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38 | #include <iprt/string.h>
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39 |
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40 | #include <stdlib.h>
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41 | #include <errno.h>
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42 | #include <sys/mman.h>
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43 | #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
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44 | # define MAP_ANONYMOUS MAP_ANON
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45 | #endif
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46 |
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47 |
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48 | /**
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49 | * Allocates memory from the specified heap.
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50 | *
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51 | * @returns Address of the allocated memory.
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52 | * @param cb The number of bytes to allocate.
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53 | * @param pszTag The tag.
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54 | * @param fZero Whether to zero the memory or not.
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55 | * @param fProtExec PROT_EXEC or 0.
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56 | */
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57 | static void *rtMemPagePosixAlloc(size_t cb, const char *pszTag, bool fZero, int fProtExec)
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58 | {
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59 | /*
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60 | * Validate & adjust the input.
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61 | */
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62 | Assert(cb > 0);
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63 | NOREF(pszTag);
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64 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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65 |
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66 | /*
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67 | * Do the allocation.
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68 | */
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69 | void *pv = mmap(NULL, cb,
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70 | PROT_READ | PROT_WRITE | fProtExec,
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71 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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72 | if (pv != MAP_FAILED)
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73 | {
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74 | AssertPtr(pv);
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75 | if (fZero)
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76 | RT_BZERO(pv, cb);
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77 | }
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78 | else
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79 | pv = NULL;
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80 |
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81 | return pv;
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82 | }
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83 |
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84 |
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85 | /**
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86 | * Free memory allocated by rtMemPagePosixAlloc.
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87 | *
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88 | * @param pv The address of the memory to free.
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89 | * @param cb The size.
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90 | */
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91 | static void rtMemPagePosixFree(void *pv, size_t cb)
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92 | {
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93 | /*
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94 | * Validate & adjust the input.
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95 | */
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96 | if (!pv)
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97 | return;
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98 | AssertPtr(pv);
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99 | Assert(cb > 0);
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100 | Assert(!((uintptr_t)pv & PAGE_OFFSET_MASK));
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101 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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102 |
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103 | /*
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104 | * Free the memory.
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105 | */
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106 | int rc = munmap(pv, cb);
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107 | AssertMsg(rc == 0, ("rc=%d pv=%p cb=%#zx\n", rc, pv, cb)); NOREF(rc);
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108 | }
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109 |
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110 |
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111 |
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112 |
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113 |
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114 | RTDECL(void *) RTMemPageAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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115 | {
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116 | return rtMemPagePosixAlloc(cb, pszTag, false /*fZero*/, 0);
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117 | }
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118 |
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119 |
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120 | RTDECL(void *) RTMemPageAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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121 | {
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122 | return rtMemPagePosixAlloc(cb, pszTag, true /*fZero*/, 0);
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123 | }
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124 |
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125 |
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126 | RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW_DEF
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127 | {
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128 | return rtMemPagePosixFree(pv, cb);
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129 | }
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130 |
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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(void *) RTMemExecAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
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136 | {
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137 | return rtMemPagePosixAlloc(cb, pszTag, false /*fZero*/, PROT_EXEC);
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138 | }
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139 |
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140 |
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141 | RTDECL(void) RTMemExecFree(void *pv, size_t cb) RT_NO_THROW_DEF
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142 | {
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143 | return rtMemPagePosixFree(pv, cb);
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144 | }
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145 |
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