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 "util/u_debug.h"
  35 #include "pipe/p_thread.h"
  36 #include "util/u_memory.h"
  37
  38 #include "rtasm_execmem.h"
  39
  40 #if defined(PIPE_OS_BSD)
  41 #define MAP_ANONYMOUS MAP_ANON
  42 #endif
  43
  44
  45 #if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS)
  46
  47
  48 /*
  49  * Allocate a large block of memory which can hold code then dole it out
  50  * in pieces by means of the generic memory manager code.
  51  */
  52
  53 #include <unistd.h>
  54 #include <sys/mman.h>
  55 #include "pipe/p_thread.h"
  56 #include "util/u_mm.h"
  57
  58 #define EXEC_HEAP_SIZE (10*1024*1024)
  59
  60 pipe_static_mutex(exec_mutex);
  61
  62 static struct mem_block *exec_heap = NULL;
  63 static unsigned char *exec_mem = NULL;
  64
  65
  66 static void
  67 init_heap(void)
  68 {
  69    if (!exec_heap)
  70       exec_heap = u_mmInit( 0, EXEC_HEAP_SIZE );
  71
  72    if (!exec_mem)
  73       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
  74                                         PROT_EXEC | PROT_READ | PROT_WRITE,
  75                                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  76 }
  77
  78
  79 void *
  80 rtasm_exec_malloc(size_t size)
  81 {
  82    struct mem_block *block = NULL;
  83    void *addr = NULL;
  84
  85    pipe_mutex_lock(exec_mutex);
  86
  87    init_heap();
  88
  89    if (exec_heap) {
  90       size = (size + 31) & ~31;  /* next multiple of 32 bytes */
  91       block = u_mmAllocMem( exec_heap, size, 5, 0 ); /* 5 -> 32-byte alignment */
  92    }
  93
  94    if (block)
  95       addr = exec_mem + block->ofs;
  96    else
  97       debug_printf("rtasm_exec_malloc failed\n");
  98
  99    pipe_mutex_unlock(exec_mutex);
 100
 101    return addr;
 102 }
 103
 104
 105 void
 106 rtasm_exec_free(void *addr)
 107 {
 108    pipe_mutex_lock(exec_mutex);
 109
 110    if (exec_heap) {
 111       struct mem_block *block = u_mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
 112
 113       if (block)
 114          u_mmFreeMem(block);
 115    }
 116
 117    pipe_mutex_unlock(exec_mutex);
 118 }
 119
 120
 121 #else /* PIPE_OS_LINUX || PIPE_OS_BSD || PIPE_OS_SOLARIS */
 122
 123 /*
 124  * Just use regular memory.
 125  */
 126
 127 void *
 128 rtasm_exec_malloc(size_t size)
 129 {
 130    return MALLOC( size );
 131 }
 132
 133
 134 void
 135 rtasm_exec_free(void *addr)
 136 {
 137    FREE(addr);
 138 }
 139
 140
 141 #endif /* PIPE_OS_LINUX || PIPE_OS_BSD || PIPE_OS_SOLARIS */