1 | /* $Id: alloc-solaris.cpp 8245 2008-04-21 17:24:28Z 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 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 | #include <iprt/alloc.h>
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36 | #include <iprt/assert.h>
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37 | #include <iprt/param.h>
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38 | #include <iprt/err.h>
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39 | #include <iprt/string.h>
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40 |
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41 | #include <stdlib.h>
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42 | #include <errno.h>
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43 | #include <sys/mman.h>
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44 | #include <strings.h>
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45 |
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46 |
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47 | #ifdef IN_RING3
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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, PAGE_SIZE);
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63 | void *pv = valloc(cb);
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64 | AssertMsg(pv, ("posix_memalign(%d) failed!!! errno=%d\n", cb, errno));
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65 | if (RT_UNLIKELY((uintptr_t)pv + cb > _2G))
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66 | {
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67 | AssertMsgFailed(("%p %#zx\n", pv, cb));
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68 | free(pv);
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69 | return NULL;
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70 | }
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71 | if (pv)
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72 | {
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73 | /*
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74 | * Add PROT_EXEC flag to the page(s).
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75 | */
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76 | memset(pv, 0xcc, cb);
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77 | int rc = mprotect(pv, cb, PROT_READ | PROT_WRITE | PROT_EXEC);
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78 | if (rc)
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79 | {
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80 | AssertMsgFailed(("mprotect(%p, %#x,,) -> rc=%d, errno=%d\n", pv, cb, rc, errno));
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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 | return valloc(RT_ALIGN_Z(cb, PAGE_SIZE));
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111 | }
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112 |
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113 |
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114 | /**
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115 | * Allocate zero'ed page aligned memory.
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116 | *
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117 | * @returns Pointer to the allocated memory.
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118 | * @returns NULL if we're out of memory.
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119 | * @param cb Size of the memory block. Will be rounded up to page size.
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120 | */
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121 | RTDECL(void *) RTMemPageAllocZ(size_t cb)
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122 | {
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123 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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124 | void *pv = valloc(cb);
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125 | if (pv)
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126 | bzero(pv, RT_ALIGN_Z(cb, PAGE_SIZE));
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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 a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
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133 | *
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134 | * @param pv Pointer to the block as it was returned by the allocation function.
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135 | * NULL will be ignored.
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136 | */
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137 | RTDECL(void) RTMemPageFree(void *pv)
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138 | {
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139 | if (pv)
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140 | free(pv);
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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 | * Change the page level protection of a memory region.
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146 | *
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147 | * @returns iprt status code.
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148 | * @param pv Start of the region. Will be rounded down to nearest page boundary.
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149 | * @param cb Size of the region. Will be rounded up to the nearest page boundary.
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150 | * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
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151 | */
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152 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect)
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153 | {
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154 | /*
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155 | * Validate input.
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156 | */
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157 | if (cb == 0)
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158 | {
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159 | AssertMsgFailed(("!cb\n"));
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160 | return VERR_INVALID_PARAMETER;
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161 | }
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162 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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163 | {
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164 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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165 | return VERR_INVALID_PARAMETER;
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166 | }
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167 |
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168 | /*
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169 | * Convert the flags.
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170 | */
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171 | int fProt;
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172 | #if RTMEM_PROT_NONE == PROT_NONE \
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173 | && RTMEM_PROT_READ == PROT_READ \
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174 | && RTMEM_PROT_WRITE == PROT_WRITE \
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175 | && RTMEM_PROT_EXEC == PROT_EXEC
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176 | fProt = fProtect;
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177 | #else
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178 | Assert(!RTMEM_PROT_NONE);
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179 | if (!fProtect)
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180 | fProt = PROT_NONE;
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181 | else
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182 | {
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183 | fProt = 0;
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184 | if (fProtect & RTMEM_PROT_READ)
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185 | fProt |= PROT_READ;
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186 | if (fProtect & RTMEM_PROT_WRITE)
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187 | fProt |= PROT_WRITE;
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188 | if (fProtect & RTMEM_PROT_EXEC)
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189 | fProt |= PROT_EXEC;
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190 | }
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191 | #endif
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192 |
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193 | /*
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194 | * Align the request.
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195 | */
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196 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
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197 | pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
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198 |
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199 | /*
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200 | * Change the page attributes.
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201 | */
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202 | int rc = mprotect(pv, cb, fProt);
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203 | if (!rc)
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204 | return rc;
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205 | return RTErrConvertFromErrno(errno);
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206 | }
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207 |
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208 | #endif
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