1 /**************************************************************************
3 * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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:
12 * The above copyright notice and this permission notice shall be included
13 * in all copies or substantial portions of the Software.
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.
22 **************************************************************************/
27 * Functions for allocating executable memory.
29 * \author Keith Whitwell
33 #include "pipe/p_compiler.h"
34 #include "util/u_debug.h"
35 #include "os/os_thread.h"
36 #include "util/u_memory.h"
38 #include "rtasm_execmem.h"
40 #if defined(PIPE_OS_BSD)
41 #define MAP_ANONYMOUS MAP_ANON
44 #if defined(PIPE_OS_WINDOWS)
45 #ifndef WIN32_LEAN_AND_MEAN
46 #define WIN32_LEAN_AND_MEAN 1
51 #if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS)
55 * Allocate a large block of memory which can hold code then dole it out
56 * in pieces by means of the generic memory manager code.
61 #include "os/os_thread.h"
62 #include "util/u_mm.h"
64 #define EXEC_HEAP_SIZE (10*1024*1024)
66 pipe_static_mutex(exec_mutex
);
68 static struct mem_block
*exec_heap
= NULL
;
69 static unsigned char *exec_mem
= NULL
;
76 exec_heap
= u_mmInit( 0, EXEC_HEAP_SIZE
);
79 exec_mem
= (unsigned char *) mmap(0, EXEC_HEAP_SIZE
,
80 PROT_EXEC
| PROT_READ
| PROT_WRITE
,
81 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
86 rtasm_exec_malloc(size_t size
)
88 struct mem_block
*block
= NULL
;
91 pipe_mutex_lock(exec_mutex
);
96 size
= (size
+ 31) & ~31; /* next multiple of 32 bytes */
97 block
= u_mmAllocMem( exec_heap
, size
, 5, 0 ); /* 5 -> 32-byte alignment */
101 addr
= exec_mem
+ block
->ofs
;
103 debug_printf("rtasm_exec_malloc failed\n");
105 pipe_mutex_unlock(exec_mutex
);
112 rtasm_exec_free(void *addr
)
114 pipe_mutex_lock(exec_mutex
);
117 struct mem_block
*block
= u_mmFindBlock(exec_heap
, (unsigned char *)addr
- exec_mem
);
123 pipe_mutex_unlock(exec_mutex
);
127 #elif defined(PIPE_OS_WINDOWS)
131 * Avoid Data Execution Prevention.
135 rtasm_exec_malloc(size_t size
)
137 return VirtualAlloc(NULL
, size
, MEM_COMMIT
, PAGE_EXECUTE_READWRITE
);
142 rtasm_exec_free(void *addr
)
144 VirtualFree(addr
, 0, MEM_RELEASE
);
152 * Just use regular memory.
156 rtasm_exec_malloc(size_t size
)
158 return MALLOC( size
);
163 rtasm_exec_free(void *addr
)