1 | /* $Id: alloc-solaris.cpp 29277 2010-05-09 23:25:51Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Memory Allocation, POSIX.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2007 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.alldomusa.eu.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 <iprt/alloc.h>
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32 | #include <iprt/assert.h>
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33 | #include <iprt/param.h>
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34 | #include <iprt/err.h>
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35 | #include <iprt/string.h>
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36 |
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37 | #include <stdlib.h>
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38 | #include <errno.h>
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39 | #include <sys/mman.h>
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40 | #include <strings.h>
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41 |
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42 |
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43 | /*******************************************************************************
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44 | * Defined Constants And Macros *
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45 | *******************************************************************************/
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46 | #if 0
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47 | # define RT_USE_MMAP_PAGE
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48 | #endif
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49 |
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50 |
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51 | /**
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52 | * Allocates memory which may contain code.
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53 | *
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54 | * @returns Pointer to the allocated memory.
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55 | * @returns NULL on failure.
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56 | * @param cb Size in bytes of the memory block to allocate.
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57 | */
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58 | RTDECL(void *) RTMemExecAlloc(size_t cb) RT_NO_THROW
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59 | {
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60 | /*
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61 | * Allocate first.
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62 | */
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63 | AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
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64 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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65 | void *pv = valloc(cb);
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66 | AssertMsg(pv, ("posix_memalign(%d) failed!!! errno=%d\n", cb, errno));
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67 | if (RT_UNLIKELY((uintptr_t)pv + cb > _2G))
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68 | {
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69 | AssertMsgFailed(("%p %#zx\n", pv, cb));
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70 | free(pv);
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71 | return NULL;
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72 | }
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73 | if (pv)
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74 | {
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75 | /*
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76 | * Add PROT_EXEC flag to the page(s).
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77 | */
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78 | memset(pv, 0xcc, cb);
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79 | int rc = mprotect(pv, cb, PROT_READ | PROT_WRITE | PROT_EXEC);
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80 | if (rc)
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81 | {
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82 | AssertMsgFailed(("mprotect(%p, %#x,,) -> rc=%d, errno=%d\n", pv, cb, rc, errno));
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83 | free(pv);
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84 | pv = NULL;
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85 | }
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86 | }
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87 | return pv;
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88 | }
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89 |
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90 |
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91 | /**
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92 | * Free executable/read/write memory allocated by RTMemExecAlloc().
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93 | *
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94 | * @param pv Pointer to memory block.
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95 | */
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96 | RTDECL(void) RTMemExecFree(void *pv) RT_NO_THROW
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97 | {
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98 | if (pv)
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99 | free(pv);
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100 | }
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101 |
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102 |
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103 | /**
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104 | * Allocate page aligned memory.
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105 | *
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106 | * @returns Pointer to the allocated memory.
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107 | * @returns NULL if we're out of memory.
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108 | * @param cb Size of the memory block. Will be rounded up to page size.
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109 | */
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110 | RTDECL(void *) RTMemPageAlloc(size_t cb) RT_NO_THROW
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111 | {
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112 | #ifdef RT_USE_MMAP_PAGE
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113 | size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
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114 | void *pv = mmap(NULL, cbAligned, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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115 | AssertMsgReturn(pv != MAP_FAILED, ("errno=%d cb=%#zx\n", errno, cb), NULL);
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116 | return pv;
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117 |
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118 | #else
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119 | return valloc(RT_ALIGN_Z(cb, PAGE_SIZE));
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120 | #endif
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121 | }
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122 |
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123 |
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124 | /**
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125 | * Allocate zero'ed page aligned memory.
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126 | *
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127 | * @returns Pointer to the allocated memory.
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128 | * @returns NULL if we're out of memory.
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129 | * @param cb Size of the memory block. Will be rounded up to page size.
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130 | */
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131 | RTDECL(void *) RTMemPageAllocZ(size_t cb) RT_NO_THROW
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132 | {
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133 | #ifdef RT_USE_MMAP_PAGE
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134 | size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
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135 | void *pv = mmap(NULL, cbAligned, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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136 | AssertMsgReturn(pv != MAP_FAILED, ("errno=%d cb=%#zx\n", errno, cb), NULL);
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137 | return pv;
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138 |
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139 | #else
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140 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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141 | void *pv = valloc(cb);
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142 | if (pv)
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143 | bzero(pv, RT_ALIGN_Z(cb, PAGE_SIZE));
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144 | return pv;
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145 | #endif
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146 | }
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147 |
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148 |
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149 | /**
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150 | * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
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151 | *
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152 | * @param pv Pointer to the block as it was returned by the allocation function.
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153 | * NULL will be ignored.
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154 | */
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155 | RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW
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156 | {
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157 | if (pv)
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158 | {
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159 | #ifdef RT_USE_MMAP_PAGE
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160 | size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
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161 | int rc = munmap(pv, cbAligned);
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162 | AssertMsg(!rc, ("munmap(%p, %#zx) -> %d errno=%d\n", pv, cbAligned, rc, errno)); NOREF(rc);
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163 | #else
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164 | free(pv);
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165 | #endif
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166 | }
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167 | }
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168 |
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169 |
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170 | /**
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171 | * Change the page level protection of a memory region.
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172 | *
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173 | * @returns iprt status code.
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174 | * @param pv Start of the region. Will be rounded down to nearest page boundary.
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175 | * @param cb Size of the region. Will be rounded up to the nearest page boundary.
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176 | * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
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177 | */
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178 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW
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179 | {
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180 | /*
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181 | * Validate input.
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182 | */
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183 | if (cb == 0)
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184 | {
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185 | AssertMsgFailed(("!cb\n"));
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186 | return VERR_INVALID_PARAMETER;
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187 | }
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188 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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189 | {
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190 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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191 | return VERR_INVALID_PARAMETER;
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192 | }
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193 |
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194 | /*
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195 | * Convert the flags.
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196 | */
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197 | int fProt;
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198 | #if RTMEM_PROT_NONE == PROT_NONE \
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199 | && RTMEM_PROT_READ == PROT_READ \
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200 | && RTMEM_PROT_WRITE == PROT_WRITE \
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201 | && RTMEM_PROT_EXEC == PROT_EXEC
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202 | fProt = fProtect;
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203 | #else
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204 | Assert(!RTMEM_PROT_NONE);
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205 | if (!fProtect)
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206 | fProt = PROT_NONE;
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207 | else
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208 | {
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209 | fProt = 0;
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210 | if (fProtect & RTMEM_PROT_READ)
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211 | fProt |= PROT_READ;
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212 | if (fProtect & RTMEM_PROT_WRITE)
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213 | fProt |= PROT_WRITE;
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214 | if (fProtect & RTMEM_PROT_EXEC)
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215 | fProt |= PROT_EXEC;
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216 | }
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217 | #endif
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218 |
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219 | /*
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220 | * Align the request.
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221 | */
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222 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
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223 | pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
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224 |
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225 | /*
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226 | * Change the page attributes.
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227 | */
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228 | int rc = mprotect(pv, cb, fProt);
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229 | if (!rc)
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230 | return rc;
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231 | return RTErrConvertFromErrno(errno);
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232 | }
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