4 * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
6 * Contact: Hocheol Seo <hocheol.seo@samsung.com>
7 * Girishashok Joshi <girish.joshi@samsung.com>
8 * Chanyeol Park <chanyeol.park@samsung.com>
10 * Licensed under the Apache License, Version 2.0 (the "License");
11 * you may not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
14 * http://www.apache.org/licenses/LICENSE-2.0
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS,
18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
24 #ifndef __STACKTRIM_H__
25 #define __STACKTRIM_H__
33 #define PAGE_SIZE (1 << 12)
34 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
35 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
36 #define PAGE_ALIGN(addr) _ALIGN_DOWN(addr, PAGE_SIZE)
38 static inline void stack_trim(void)
44 unsigned int stacktop;
47 asm volatile ("mov %0,sp " : "=r"(sp));
49 sprintf(buf, "/proc/%d/maps", getpid());
50 file = fopen(buf, "r");
51 while (fgets(buf, BUF_SIZE, file) != NULL) {
52 if (strstr(buf, "[stack]")) {
60 sscanf(buf, "%x-", &stacktop);
61 if (madvise((void *)PAGE_ALIGN(stacktop), PAGE_ALIGN(sp) - stacktop,
63 perror("stack madvise fail");
68 #endif /* __STACKTRIM_H__ */