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
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)17 static inline int syscall_get_nr(struct task_struct *task,
18 struct pt_regs *regs)
19 {
20 return regs->b0;
21 }
22
syscall_rollback(struct task_struct * task,struct pt_regs * regs)23 static inline void syscall_rollback(struct task_struct *task,
24 struct pt_regs *regs)
25 {
26 /* do nothing */
27 }
28
syscall_get_error(struct task_struct * task,struct pt_regs * regs)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
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)35 static inline long syscall_get_return_value(struct task_struct *task,
36 struct pt_regs *regs)
37 {
38 return regs->a4;
39 }
40
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)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
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,unsigned long * args)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
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,const unsigned long * args)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 */
124