1 | /*
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2 | * Mesa 3-D graphics library
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3 | * Version: 6.5
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4 | *
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5 | * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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6 | *
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7 | * Permission is hereby granted, free of charge, to any person obtaining a
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8 | * copy of this software and associated documentation files (the "Software"),
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9 | * to deal in the Software without restriction, including without limitation
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10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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11 | * and/or sell copies of the Software, and to permit persons to whom the
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12 | * Software is furnished to do so, subject to the following conditions:
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13 | *
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14 | * The above copyright notice and this permission notice shall be included
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15 | * in all copies or substantial portions of the Software.
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16 | *
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17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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18 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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21 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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22 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 | */
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24 |
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25 |
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26 | /**
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27 | * \file execmem.c
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28 | * Functions for allocating executable memory.
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29 | *
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30 | * \author Keith Whitwell
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31 | */
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32 |
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33 |
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34 | #include "imports.h"
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35 | #include "glapi/glthread.h"
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36 |
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37 |
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38 |
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39 | #if defined(__linux__) || defined(__OpenBSD__) || defined(_NetBSD__) || defined(__sun)
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40 |
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41 | /*
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42 | * Allocate a large block of memory which can hold code then dole it out
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43 | * in pieces by means of the generic memory manager code.
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44 | */
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45 |
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46 | #include <unistd.h>
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47 | #include <sys/mman.h>
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48 | #include "mm.h"
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49 |
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50 | #ifdef MESA_SELINUX
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51 | #include <selinux/selinux.h>
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52 | #endif
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53 |
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54 |
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55 | #ifndef MAP_ANONYMOUS
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56 | #define MAP_ANONYMOUS MAP_ANON
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57 | #endif
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58 |
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59 |
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60 | #define EXEC_HEAP_SIZE (10*1024*1024)
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61 |
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62 | _glthread_DECLARE_STATIC_MUTEX(exec_mutex);
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63 |
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64 | static struct mem_block *exec_heap = NULL;
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65 | static unsigned char *exec_mem = NULL;
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66 |
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67 |
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68 | static int
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69 | init_heap(void)
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70 | {
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71 | #ifdef MESA_SELINUX
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72 | if (is_selinux_enabled()) {
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73 | if (!security_get_boolean_active("allow_execmem") ||
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74 | !security_get_boolean_pending("allow_execmem"))
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75 | return 0;
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76 | }
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77 | #endif
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78 |
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79 | if (!exec_heap)
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80 | exec_heap = mmInit( 0, EXEC_HEAP_SIZE );
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81 |
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82 | if (!exec_mem)
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83 | exec_mem = mmap(NULL, EXEC_HEAP_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE,
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84 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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85 |
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86 | return (exec_mem != MAP_FAILED);
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87 | }
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88 |
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89 |
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90 | void *
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91 | _mesa_exec_malloc(GLuint size)
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92 | {
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93 | struct mem_block *block = NULL;
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94 | void *addr = NULL;
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95 |
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96 | _glthread_LOCK_MUTEX(exec_mutex);
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97 |
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98 | if (!init_heap())
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99 | goto bail;
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100 |
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101 | if (exec_heap) {
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102 | size = (size + 31) & ~31;
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103 | block = mmAllocMem( exec_heap, size, 32, 0 );
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104 | }
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105 |
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106 | if (block)
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107 | addr = exec_mem + block->ofs;
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108 | else
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109 | printf("_mesa_exec_malloc failed\n");
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110 |
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111 | bail:
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112 | _glthread_UNLOCK_MUTEX(exec_mutex);
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113 |
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114 | return addr;
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115 | }
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116 |
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117 |
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118 | void
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119 | _mesa_exec_free(void *addr)
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120 | {
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121 | _glthread_LOCK_MUTEX(exec_mutex);
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122 |
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123 | if (exec_heap) {
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124 | struct mem_block *block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
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125 |
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126 | if (block)
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127 | mmFreeMem(block);
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128 | }
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129 |
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130 | _glthread_UNLOCK_MUTEX(exec_mutex);
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131 | }
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132 |
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133 | #elif defined(__HAIKU__)
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134 |
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135 | #include <OS.h>
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136 |
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137 | /*
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138 | * As Haiku uses NX, malloc doesn't cut it.
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139 | * Luckly the Haiku memory management is awesome.
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140 | */
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141 |
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142 | void*
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143 | _mesa_exec_malloc(GLuint size)
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144 | {
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145 | void* addr = NULL;
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146 | GLuint alignedSize = (((size - 1) % B_PAGE_SIZE) + 1) * B_PAGE_SIZE;
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147 | area_id area = create_area("Mesa ExecMemory", &addr),
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148 | B_ANY_ADDRESS, alignedSize, B_NO_LOCK,
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149 | B_READ_AREA | B_WRITE_AREA | B_EXECUTE_AREA);
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150 | if (area < 0)
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151 | printf("%s: Unable to malloc exec area!\n", __func__);
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152 | return addr;
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153 | }
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154 |
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155 |
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156 | void
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157 | _mesa_exec_free(void* addr)
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158 | {
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159 | area_id area = area_for(addr);
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160 | if (area < 0)
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161 | printf("%s: Unable to locate area!\n", __func__);
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162 | else
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163 | delete_area(area);
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164 | }
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165 |
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166 | #else
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167 |
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168 | /*
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169 | * Just use regular memory.
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170 | */
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171 |
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172 | void *
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173 | _mesa_exec_malloc(GLuint size)
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174 | {
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175 | return malloc( size );
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176 | }
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177 |
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178 |
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179 | void
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180 | _mesa_exec_free(void *addr)
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181 | {
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182 | free(addr);
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183 | }
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184 |
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185 |
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186 | #endif
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