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