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/*
* app-core
*
* Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
*
* Contact: Jayoun Lee <airjany@samsung.com>, Sewook Park <sewook7.park@samsung.com>, Jaeho Lee <jaeho81.lee@samsung.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/mman.h>
#include "appcore-internal.h"
#define GETSP() ({ unsigned int sp; asm volatile ("mov %0,sp " : "=r"(sp) ); sp;})
#define BUF_SIZE 256
#define PAGE_SIZE (1 << 12)
#define _ALIGN_UP(addr , size) (((addr)+((size)-1))&(~((size)-1)))
#define _ALIGN_DOWN(addr , size) ((addr)&(~((size)-1)))
#define PAGE_ALIGN(addr) _ALIGN_DOWN(addr, PAGE_SIZE)
void stack_trim(void)
{
unsigned int sp;
char buf[BUF_SIZE];
FILE *file;
unsigned int stacktop;
int found = 0;
sp = GETSP();
sprintf(buf, "/proc/%d/maps", getpid());
file = fopen(buf, "r");
while (fgets(buf, BUF_SIZE, file) != NULL) {
if (strstr(buf, "[stack]")) {
found = 1;
break;
}
}
fclose(file);
if (found) {
sscanf(buf, "%x-", &stacktop);
if (madvise
((void *)PAGE_ALIGN(stacktop), PAGE_ALIGN(sp) - stacktop,
MADV_DONTNEED) < 0)
perror("stack madvise fail");
}
}
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