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(PIPE_OS_LINUX)
  42
  43
  44 /*
  45  * Allocate a large block of memory which can hold code then dole it out
  46  * in pieces by means of the generic memory manager code.
  47  */
  48
  49 #include <unistd.h>
  50 #include <sys/mman.h>
  51 #include "pipe/p_thread.h"
  52 #include "util/u_mm.h"
  53
  54 #define EXEC_HEAP_SIZE (10*1024*1024)
  55
  56 pipe_static_mutex(exec_mutex);
  57
  58 static struct mem_block *exec_heap = NULL;
  59 static unsigned char *exec_mem = NULL;
  60
  61
  62 static void
  63 init_heap(void)
  64 {
  65    if (!exec_heap)
  66       exec_heap = u_mmInit( 0, EXEC_HEAP_SIZE );
  67
  68    if (!exec_mem)
  69       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
  70                                         PROT_EXEC | PROT_READ | PROT_WRITE,
  71                                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  72 }
  73
  74
  75 void *
  76 rtasm_exec_malloc(size_t size)
  77 {
  78    struct mem_block *block = NULL;
  79    void *addr = NULL;
  80
  81    pipe_mutex_lock(exec_mutex);
  82
  83    init_heap();
  84
  85    if (exec_heap) {
  86       size = (size + 31) & ~31;  /* next multiple of 32 bytes */
  87       block = u_mmAllocMem( exec_heap, size, 5, 0 ); /* 5 -> 32-byte alignment */
  88    }
  89
  90    if (block)
  91       addr = exec_mem + block->ofs;
  92    else
  93       debug_printf("rtasm_exec_malloc failed\n");
  94
  95    pipe_mutex_unlock(exec_mutex);
  96
  97    return addr;
  98 }
  99
 100
 101 void
 102 rtasm_exec_free(void *addr)
 103 {
 104    pipe_mutex_lock(exec_mutex);
 105
 106    if (exec_heap) {
 107       struct mem_block *block = u_mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
 108
 109       if (block)
 110          u_mmFreeMem(block);
 111    }
 112
 113    pipe_mutex_unlock(exec_mutex);
 114 }
 115
 116
 117 #else /* PIPE_OS_LINUX */
 118
 119 /*
 120  * Just use regular memory.
 121  */
 122
 123 void *
 124 rtasm_exec_malloc(size_t size)
 125 {
 126    return MALLOC( size );
 127 }
 128
 129
 130 void
 131 rtasm_exec_free(void *addr)
 132 {
 133    FREE(addr);
 134 }
 135
 136
 137 #endif /* PIPE_OS_LINUX */