Linux Kernel  3.7.1
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syscall.h
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1 /* Access to user system call parameters and results
2  *
3  * See asm-generic/syscall.h for function descriptions.
4  *
5  * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
6  * Written by David Howells ([email protected])
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public Licence
10  * as published by the Free Software Foundation; either version
11  * 2 of the Licence, or (at your option) any later version.
12  */
13 
14 #ifndef _ASM_SYSCALL_H
15 #define _ASM_SYSCALL_H
16 
17 #include <linux/sched.h>
18 #include <linux/err.h>
19 
20 extern const unsigned long sys_call_table[];
21 
22 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
23 {
24  return regs->orig_d0;
25 }
26 
27 static inline void syscall_rollback(struct task_struct *task,
28  struct pt_regs *regs)
29 {
30  regs->d0 = regs->orig_d0;
31 }
32 
33 static inline long syscall_get_error(struct task_struct *task,
34  struct pt_regs *regs)
35 {
36  unsigned long error = regs->d0;
37  return IS_ERR_VALUE(error) ? error : 0;
38 }
39 
40 static inline long syscall_get_return_value(struct task_struct *task,
41  struct pt_regs *regs)
42 {
43  return regs->d0;
44 }
45 
46 static inline void syscall_set_return_value(struct task_struct *task,
47  struct pt_regs *regs,
48  int error, long val)
49 {
50  regs->d0 = (long) error ?: val;
51 }
52 
53 static inline void syscall_get_arguments(struct task_struct *task,
54  struct pt_regs *regs,
55  unsigned int i, unsigned int n,
56  unsigned long *args)
57 {
58  switch (i) {
59  case 0:
60  if (!n--) break;
61  *args++ = regs->a0;
62  case 1:
63  if (!n--) break;
64  *args++ = regs->d1;
65  case 2:
66  if (!n--) break;
67  *args++ = regs->a3;
68  case 3:
69  if (!n--) break;
70  *args++ = regs->a2;
71  case 4:
72  if (!n--) break;
73  *args++ = regs->d3;
74  case 5:
75  if (!n--) break;
76  *args++ = regs->d2;
77  case 6:
78  if (!n--) break;
79  default:
80  BUG();
81  break;
82  }
83 }
84 
85 static inline void syscall_set_arguments(struct task_struct *task,
86  struct pt_regs *regs,
87  unsigned int i, unsigned int n,
88  const unsigned long *args)
89 {
90  switch (i) {
91  case 0:
92  if (!n--) break;
93  regs->a0 = *args++;
94  case 1:
95  if (!n--) break;
96  regs->d1 = *args++;
97  case 2:
98  if (!n--) break;
99  regs->a3 = *args++;
100  case 3:
101  if (!n--) break;
102  regs->a2 = *args++;
103  case 4:
104  if (!n--) break;
105  regs->d3 = *args++;
106  case 5:
107  if (!n--) break;
108  regs->d2 = *args++;
109  case 6:
110  if (!n--) break;
111  default:
112  BUG();
113  break;
114  }
115 }
116 
117 #endif /* _ASM_SYSCALL_H */
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