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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include "platform_api_vmcore.h"
#ifndef BH_ENABLE_TRACE_MMAP
#define BH_ENABLE_TRACE_MMAP 0
#endif
#if BH_ENABLE_TRACE_MMAP != 0
static size_t total_size_mmapped = 0;
static size_t total_size_munmapped = 0;
#endif
#define HUGE_PAGE_SIZE (2 * 1024 * 1024)
#if !defined(__APPLE__) && !defined(__NuttX__) && defined(MADV_HUGEPAGE)
static inline uintptr_t
round_up(uintptr_t v, uintptr_t b)
{
uintptr_t m = b - 1;
return (v + m) & ~m;
}
static inline uintptr_t
round_down(uintptr_t v, uintptr_t b)
{
uintptr_t m = b - 1;
return v & ~m;
}
#endif
void *
os_mmap(void *hint, size_t size, int prot, int flags)
{
int map_prot = PROT_NONE;
int map_flags = MAP_ANONYMOUS | MAP_PRIVATE;
uint64 request_size, page_size;
uint8 *addr = MAP_FAILED;
uint32 i;
page_size = (uint64)getpagesize();
request_size = (size + page_size - 1) & ~(page_size - 1);
#if !defined(__APPLE__) && !defined(__NuttX__) && defined(MADV_HUGEPAGE)
/* huge page isn't supported on MacOS and NuttX */
if (request_size >= HUGE_PAGE_SIZE)
/* apply one extra huge page */
request_size += HUGE_PAGE_SIZE;
#endif
if ((size_t)request_size < size)
/* integer overflow */
return NULL;
if (request_size > 16 * (uint64)UINT32_MAX)
/* at most 16 G is allowed */
return NULL;
if (prot & MMAP_PROT_READ)
map_prot |= PROT_READ;
if (prot & MMAP_PROT_WRITE)
map_prot |= PROT_WRITE;
if (prot & MMAP_PROT_EXEC)
map_prot |= PROT_EXEC;
#if defined(BUILD_TARGET_X86_64) || defined(BUILD_TARGET_AMD_64)
#ifndef __APPLE__
if (flags & MMAP_MAP_32BIT)
map_flags |= MAP_32BIT;
#endif
#endif
if (flags & MMAP_MAP_FIXED)
map_flags |= MAP_FIXED;
#if defined(BUILD_TARGET_RISCV64_LP64D) || defined(BUILD_TARGET_RISCV64_LP64)
/* As AOT relocation in RISCV64 may require that the code/data mapped
* is in range 0 to 2GB, we try to map the memory with hint address
* (mmap's first argument) to meet the requirement.
*/
if (!hint && !(flags & MMAP_MAP_FIXED) && (flags & MMAP_MAP_32BIT)) {
uint8 *stack_addr = (uint8 *)&map_prot;
uint8 *text_addr = (uint8 *)os_mmap;
/* hint address begins with 1MB */
static uint8 *hint_addr = (uint8 *)(uintptr_t)BH_MB;
if ((hint_addr - text_addr >= 0 && hint_addr - text_addr < 100 * BH_MB)
|| (text_addr - hint_addr >= 0
&& text_addr - hint_addr < 100 * BH_MB)) {
/* hint address is possibly in text section, skip it */
hint_addr += 100 * BH_MB;
}
if ((hint_addr - stack_addr >= 0 && hint_addr - stack_addr < 8 * BH_MB)
|| (stack_addr - hint_addr >= 0
&& stack_addr - hint_addr < 8 * BH_MB)) {
/* hint address is possibly in native stack area, skip it */
hint_addr += 8 * BH_MB;
}
/* try 10 times, step with 1MB each time */
for (i = 0; i < 10 && hint_addr < (uint8 *)(uintptr_t)(2ULL * BH_GB);
i++) {
addr = mmap(hint_addr, request_size, map_prot, map_flags, -1, 0);
if (addr != MAP_FAILED) {
if (addr > (uint8 *)(uintptr_t)(2ULL * BH_GB)) {
/* unmap and try again if the mapped address doesn't
* meet the requirement */
os_munmap(addr, request_size);
}
else {
/* success, reset next hint address */
hint_addr += request_size;
break;
}
}
hint_addr += BH_MB;
}
}
#endif /* end of BUILD_TARGET_RISCV64_LP64D || BUILD_TARGET_RISCV64_LP64 */
/* memory has't been mapped or was mapped failed previously */
if (addr == MAP_FAILED) {
/* try 5 times */
for (i = 0; i < 5; i++) {
addr = mmap(hint, request_size, map_prot, map_flags, -1, 0);
if (addr != MAP_FAILED)
break;
}
}
if (addr == MAP_FAILED) {
#if BH_ENABLE_TRACE_MMAP != 0
os_printf("mmap failed\n");
#endif
return NULL;
}
#if BH_ENABLE_TRACE_MMAP != 0
total_size_mmapped += request_size;
os_printf("mmap return: %p with size: %zu, total_size_mmapped: %zu, "
"total_size_munmapped: %zu\n",
addr, request_size, total_size_mmapped, total_size_munmapped);
#endif
#if !defined(__APPLE__) && !defined(__NuttX__) && defined(MADV_HUGEPAGE)
/* huge page isn't supported on MacOS and NuttX */
if (request_size > HUGE_PAGE_SIZE) {
uintptr_t huge_start, huge_end;
size_t prefix_size = 0, suffix_size = HUGE_PAGE_SIZE;
huge_start = round_up((uintptr_t)addr, HUGE_PAGE_SIZE);
if (huge_start > (uintptr_t)addr) {
prefix_size += huge_start - (uintptr_t)addr;
suffix_size -= huge_start - (uintptr_t)addr;
}
/* unmap one extra huge page */
if (prefix_size > 0) {
munmap(addr, prefix_size);
#if BH_ENABLE_TRACE_MMAP != 0
total_size_munmapped += prefix_size;
os_printf("munmap %p with size: %zu, total_size_mmapped: %zu, "
"total_size_munmapped: %zu\n",
addr, prefix_size, total_size_mmapped,
total_size_munmapped);
#endif
}
if (suffix_size > 0) {
munmap(addr + request_size - suffix_size, suffix_size);
#if BH_ENABLE_TRACE_MMAP != 0
total_size_munmapped += suffix_size;
os_printf("munmap %p with size: %zu, total_size_mmapped: %zu, "
"total_size_munmapped: %zu\n",
addr + request_size - suffix_size, suffix_size,
total_size_mmapped, total_size_munmapped);
#endif
}
addr = (uint8 *)huge_start;
request_size -= HUGE_PAGE_SIZE;
huge_end = round_down(huge_start + request_size, HUGE_PAGE_SIZE);
if (huge_end > huge_start) {
int ret = madvise((void *)huge_start, huge_end - huge_start,
MADV_HUGEPAGE);
if (ret) {
#if BH_ENABLE_TRACE_MMAP != 0
os_printf(
"warning: madvise(%p, %lu) huge page failed, return %d\n",
(void *)huge_start, huge_end - huge_start, ret);
#endif
}
}
}
#endif /* end of __APPLE__ || __NuttX__ || !MADV_HUGEPAGE */
return addr;
}
void
os_munmap(void *addr, size_t size)
{
uint64 page_size = (uint64)getpagesize();
uint64 request_size = (size + page_size - 1) & ~(page_size - 1);
if (addr) {
if (munmap(addr, request_size)) {
os_printf("os_munmap error addr:%p, size:0x%" PRIx64 ", errno:%d\n",
addr, request_size, errno);
return;
}
#if BH_ENABLE_TRACE_MMAP != 0
total_size_munmapped += request_size;
os_printf("munmap %p with size: %zu, total_size_mmapped: %zu, "
"total_size_munmapped: %zu\n",
addr, request_size, total_size_mmapped, total_size_munmapped);
#endif
}
}
int
os_mprotect(void *addr, size_t size, int prot)
{
int map_prot = PROT_NONE;
uint64 page_size = (uint64)getpagesize();
uint64 request_size = (size + page_size - 1) & ~(page_size - 1);
if (!addr)
return 0;
if (prot & MMAP_PROT_READ)
map_prot |= PROT_READ;
if (prot & MMAP_PROT_WRITE)
map_prot |= PROT_WRITE;
if (prot & MMAP_PROT_EXEC)
map_prot |= PROT_EXEC;
return mprotect(addr, request_size, map_prot);
}
void
os_dcache_flush(void)
{}
|
