Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. /**************************************************************************
  2.  *
  3.  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the "Software"),
  7.  * to deal in the Software without restriction, including without limitation
  8.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  9.  * and/or sell copies of the Software, and to permit persons to whom the
  10.  * Software is furnished to do so, subject to the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice shall be included
  13.  * in all copies or substantial portions of the Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21.  * OTHER DEALINGS IN THE SOFTWARE.
  22.  *
  23.  **************************************************************************/
  24.  
  25.  
  26. /**
  27.  * \file exemem.c
  28.  * Functions for allocating executable memory.
  29.  *
  30.  * \author Keith Whitwell
  31.  */
  32.  
  33.  
  34. #include "pipe/p_compiler.h"
  35. #include "util/u_debug.h"
  36. #include "os/os_thread.h"
  37. #include "util/u_memory.h"
  38.  
  39. #include "rtasm_execmem.h"
  40.  
  41. #if defined(PIPE_OS_BSD)
  42. #define MAP_ANONYMOUS MAP_ANON
  43. #endif
  44.  
  45. #if defined(PIPE_OS_WINDOWS)
  46. #ifndef WIN32_LEAN_AND_MEAN
  47. #define WIN32_LEAN_AND_MEAN 1
  48. #endif
  49. #include <windows.h>
  50. #endif
  51.  
  52. #if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_HAIKU)
  53.  
  54.  
  55. /*
  56.  * Allocate a large block of memory which can hold code then dole it out
  57.  * in pieces by means of the generic memory manager code.
  58.  */
  59.  
  60. #include <unistd.h>
  61. #include <sys/mman.h>
  62. #include "util/u_mm.h"
  63.  
  64. #define EXEC_HEAP_SIZE (10*1024*1024)
  65.  
  66. pipe_static_mutex(exec_mutex);
  67.  
  68. static struct mem_block *exec_heap = NULL;
  69. static unsigned char *exec_mem = NULL;
  70.  
  71.  
  72. static void
  73. init_heap(void)
  74. {
  75.    if (!exec_heap)
  76.       exec_heap = u_mmInit( 0, EXEC_HEAP_SIZE );
  77.    
  78.    if (!exec_mem)
  79.       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
  80.                                         PROT_EXEC | PROT_READ | PROT_WRITE,
  81.                                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  82. }
  83.  
  84.  
  85. void *
  86. rtasm_exec_malloc(size_t size)
  87. {
  88.    struct mem_block *block = NULL;
  89.    void *addr = NULL;
  90.  
  91.    pipe_mutex_lock(exec_mutex);
  92.  
  93.    init_heap();
  94.  
  95.    if (exec_heap) {
  96.       size = (size + 31) & ~31;  /* next multiple of 32 bytes */
  97.       block = u_mmAllocMem( exec_heap, size, 5, 0 ); /* 5 -> 32-byte alignment */
  98.    }
  99.  
  100.    if (block)
  101.       addr = exec_mem + block->ofs;
  102.    else
  103.       debug_printf("rtasm_exec_malloc failed\n");
  104.    
  105.    pipe_mutex_unlock(exec_mutex);
  106.    
  107.    return addr;
  108. }
  109.  
  110.  
  111. void
  112. rtasm_exec_free(void *addr)
  113. {
  114.    pipe_mutex_lock(exec_mutex);
  115.  
  116.    if (exec_heap) {
  117.       struct mem_block *block = u_mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
  118.    
  119.       if (block)
  120.          u_mmFreeMem(block);
  121.    }
  122.  
  123.    pipe_mutex_unlock(exec_mutex);
  124. }
  125.  
  126.  
  127. #elif defined(PIPE_OS_WINDOWS)
  128.  
  129.  
  130. /*
  131.  * Avoid Data Execution Prevention.
  132.  */
  133.  
  134. void *
  135. rtasm_exec_malloc(size_t size)
  136. {
  137.    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
  138. }
  139.  
  140.  
  141. void
  142. rtasm_exec_free(void *addr)
  143. {
  144.    VirtualFree(addr, 0, MEM_RELEASE);
  145. }
  146.  
  147.  
  148. #else
  149.  
  150.  
  151. /*
  152.  * Just use regular memory.
  153.  */
  154.  
  155. void *
  156. rtasm_exec_malloc(size_t size)
  157. {
  158.    return MALLOC( size );
  159. }
  160.  
  161.  
  162. void
  163. rtasm_exec_free(void *addr)
  164. {
  165.    FREE(addr);
  166. }
  167.  
  168.  
  169. #endif
  170.