-
Notifications
You must be signed in to change notification settings - Fork 7
/
e9syscall.h
58 lines (53 loc) · 2.23 KB
/
e9syscall.h
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
/*
* ___ _ _
* ___ / _ \ ___ _ _ ___ ___ __ _| | |
* / _ \ (_) / __| | | / __|/ __/ _` | | |
* | __/\__, \__ \ |_| \__ \ (_| (_| | | |
* \___| /_/|___/\__, |___/\___\__,_|_|_|
* |___/
*
* Copyright (C) 2023 National University of Singapore
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __E9SYSCALL_H
#define __E9SYSCALL_H
#include "stdlib.c"
#define E9_INSTRUMENT (-1)
#define E9_REPLACE (0)
/*
* The system call hook function to be defined by the user. There are two
* basic modes for the hook() function:
*
* (1) [INSTRUMENTATION] The original system call will be executed with the
* original arguments after the hook() function has returned. To enable
* this mode, the hook() function should return a non-zero value, and the
* result value will be ignored.
*
* (2) [REPLACEMENT] The original system call is replaced by the hook()
* function. To enable this mode, the hook() function should return 0,
* and *result should be set to the replacement syscall return value.
*
* Note that only (1) can be used for the `rt_sigreturn' and `clone' syscalls.
*/
int hook(
int callno, // System call number.
intptr_t arg1, // System call argument #1
intptr_t arg2, // System call argument #2
intptr_t arg3, // System call argument #3
intptr_t arg4, // System call argument #4
intptr_t arg5, // System call argument #5
intptr_t arg6, // System call argument #6
intptr_t *result); // System call result
#endif /* __E9SYSCALL_H */