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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4358 | Serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * |
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| 4 | * Copyright (C) 1999-2005 Brian Paul All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the "Software"), |
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| 8 | * to deal in the Software without restriction, including without limitation |
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| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 11 | * Software is furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included |
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| 14 | * in all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 17 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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| 20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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| 21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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| 22 | * OTHER DEALINGS IN THE SOFTWARE. |
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| 23 | */ |
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| 24 | |||
| 25 | |||
| 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 | |||
| 33 | |||
| 34 | #include "imports.h" |
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| 35 | #include "glapi/glthread.h" |
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| 36 | |||
| 37 | |||
| 38 | |||
| 39 | #if defined(__linux__) || defined(__OpenBSD__) || defined(_NetBSD__) || defined(__sun) || defined(__HAIKU__) |
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| 40 | |||
| 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 | |||
| 46 | #include |
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| 47 | #include |
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| 48 | #include "mm.h" |
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| 49 | |||
| 50 | #ifdef MESA_SELINUX |
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| 51 | #include |
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| 52 | #endif |
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| 53 | |||
| 54 | |||
| 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 | |||
| 59 | |||
| 60 | #define EXEC_HEAP_SIZE (10*1024*1024) |
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| 61 | |||
| 62 | _glthread_DECLARE_STATIC_MUTEX(exec_mutex); |
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| 63 | |||
| 64 | static struct mem_block *exec_heap = NULL; |
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| 65 | static unsigned char *exec_mem = NULL; |
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| 66 | |||
| 67 | |||
| 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 | |||
| 79 | if (!exec_heap) |
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| 80 | exec_heap = mmInit( 0, EXEC_HEAP_SIZE ); |
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| 81 | |||
| 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 | |||
| 86 | return (exec_mem != MAP_FAILED); |
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| 87 | } |
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| 88 | |||
| 89 | |||
| 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 | |||
| 96 | _glthread_LOCK_MUTEX(exec_mutex); |
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| 97 | |||
| 98 | if (!init_heap()) |
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| 99 | goto bail; |
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| 100 | |||
| 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 | |||
| 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 | |||
| 111 | bail: |
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| 112 | _glthread_UNLOCK_MUTEX(exec_mutex); |
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| 113 | |||
| 114 | return addr; |
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| 115 | } |
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| 116 | |||
| 117 | |||
| 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 | |||
| 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 | |||
| 126 | if (block) |
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| 127 | mmFreeMem(block); |
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| 128 | } |
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| 129 | |||
| 130 | _glthread_UNLOCK_MUTEX(exec_mutex); |
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| 131 | } |
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| 132 | |||
| 133 | |||
| 134 | #else |
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| 135 | |||
| 136 | /* |
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| 137 | * Just use regular memory. |
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| 138 | */ |
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| 139 | |||
| 140 | void * |
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| 141 | _mesa_exec_malloc(GLuint size) |
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| 142 | { |
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| 143 | return malloc( size ); |
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| 144 | } |
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| 145 | |||
| 146 | |||
| 147 | void |
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| 148 | _mesa_exec_free(void *addr) |
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| 149 | { |
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| 150 | free(addr); |
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| 151 | } |
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| 152 | |||
| 153 | |||
| 154 | #endif |