C6X: headers
[linux-3.10.git] / arch / c6x / include / asm / syscall.h
1 /*
2  * Copyright (C) 2011 Texas Instruments Incorporated
3  * Author: Mark Salter <msalter@redhat.com>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  */
10
11 #ifndef __ASM_C6X_SYSCALL_H
12 #define __ASM_C6X_SYSCALL_H
13
14 #include <linux/err.h>
15 #include <linux/sched.h>
16
17 static inline int syscall_get_nr(struct task_struct *task,
18                                  struct pt_regs *regs)
19 {
20         return regs->b0;
21 }
22
23 static inline void syscall_rollback(struct task_struct *task,
24                                     struct pt_regs *regs)
25 {
26         /* do nothing */
27 }
28
29 static inline long syscall_get_error(struct task_struct *task,
30                                      struct pt_regs *regs)
31 {
32         return IS_ERR_VALUE(regs->a4) ? regs->a4 : 0;
33 }
34
35 static inline long syscall_get_return_value(struct task_struct *task,
36                                             struct pt_regs *regs)
37 {
38         return regs->a4;
39 }
40
41 static inline void syscall_set_return_value(struct task_struct *task,
42                                             struct pt_regs *regs,
43                                             int error, long val)
44 {
45         regs->a4 = error ?: val;
46 }
47
48 static inline void syscall_get_arguments(struct task_struct *task,
49                                          struct pt_regs *regs, unsigned int i,
50                                          unsigned int n, unsigned long *args)
51 {
52         switch (i) {
53         case 0:
54                 if (!n--)
55                         break;
56                 *args++ = regs->a4;
57         case 1:
58                 if (!n--)
59                         break;
60                 *args++ = regs->b4;
61         case 2:
62                 if (!n--)
63                         break;
64                 *args++ = regs->a6;
65         case 3:
66                 if (!n--)
67                         break;
68                 *args++ = regs->b6;
69         case 4:
70                 if (!n--)
71                         break;
72                 *args++ = regs->a8;
73         case 5:
74                 if (!n--)
75                         break;
76                 *args++ = regs->b8;
77         case 6:
78                 if (!n--)
79                         break;
80         default:
81                 BUG();
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--)
93                         break;
94                 regs->a4 = *args++;
95         case 1:
96                 if (!n--)
97                         break;
98                 regs->b4 = *args++;
99         case 2:
100                 if (!n--)
101                         break;
102                 regs->a6 = *args++;
103         case 3:
104                 if (!n--)
105                         break;
106                 regs->b6 = *args++;
107         case 4:
108                 if (!n--)
109                         break;
110                 regs->a8 = *args++;
111         case 5:
112                 if (!n--)
113                         break;
114                 regs->a9 = *args++;
115         case 6:
116                 if (!n)
117                         break;
118         default:
119                 BUG();
120         }
121 }
122
123 #endif /* __ASM_C6X_SYSCALLS_H */