src/gallium/auxiliary/rtasm/rtasm_execmem.c

   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  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  19  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  20  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  **************************************************************************/
  23
  24
  25 /**
  26  * \file exemem.c
  27  * Functions for allocating executable memory.
  28  *
  29  * \author Keith Whitwell
  30  */
  31
  32
  33 #include "pipe/p_compiler.h"
  34 #include "pipe/p_debug.h"
  35 #include "pipe/p_thread.h"
  36 #include "util/u_memory.h"
  37
  38 #include "rtasm_execmem.h"
  39
  40
  41 #if defined(__linux__)
  42
  43 /*
  44  * Allocate a large block of memory which can hold code then dole it out
  45  * in pieces by means of the generic memory manager code.
  46 */
  47
  48 #include <unistd.h>
  49 #include <sys/mman.h>
  50 #include "pipe/p_thread.h"
  51 #include "util/u_mm.h"
  52
  53 #define EXEC_HEAP_SIZE (10*1024*1024)
  54
  55 pipe_static_mutex(exec_mutex);
  56
  57 static struct mem_block *exec_heap = NULL;
  58 static unsigned char *exec_mem = NULL;
  59
  60
  61 static void
  62 init_heap(void)
  63 {
  64    if (!exec_heap)
  65       exec_heap = mmInit( 0, EXEC_HEAP_SIZE );
  66
  67    if (!exec_mem)
  68       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
  69                                         PROT_EXEC | PROT_READ | PROT_WRITE,
  70                                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  71 }
  72
  73
  74 void *
  75 rtasm_exec_malloc(size_t size)
  76 {
  77    struct mem_block *block = NULL;
  78    void *addr = NULL;
  79
  80    pipe_mutex_lock(exec_mutex);
  81
  82    init_heap();
  83
  84    if (exec_heap) {
  85       size = (size + 31) & ~31;
  86       block = mmAllocMem( exec_heap, size, 32, 0 );
  87    }
  88
  89    if (block)
  90       addr = exec_mem + block->ofs;
  91    else
  92       debug_printf("rtasm_exec_malloc failed\n");
  93
  94    pipe_mutex_unlock(exec_mutex);
  95
  96    return addr;
  97 }
  98
  99
 100 void
 101 rtasm_exec_free(void *addr)
 102 {
 103    pipe_mutex_lock(exec_mutex);
 104
 105    if (exec_heap) {
 106       struct mem_block *block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
 107
 108       if (block)
 109          mmFreeMem(block);
 110    }
 111
 112    pipe_mutex_unlock(exec_mutex);
 113 }
 114
 115
 116 #else
 117
 118 /*
 119  * Just use regular memory.
 120  */
 121
 122 void *
 123 rtasm_exec_malloc(size_t size)
 124 {
 125    return MALLOC( size );
 126 }
 127
 128
 129 void
 130 rtasm_exec_free(void *addr)
 131 {
 132    FREE(addr);
 133 }
 134
 135
 136 #endif