1 #ifndef __ASM_MICROBLAZE_SYSCALL_H
2 #define __ASM_MICROBLAZE_SYSCALL_H
3
4 #include <linux/kernel.h>
5 #include <linux/sched.h>
6 #include <asm/ptrace.h>
7
8 /* The system call number is given by the user in R12 */
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)9 static inline long syscall_get_nr(struct task_struct *task,
10 struct pt_regs *regs)
11 {
12 return regs->r12;
13 }
14
syscall_rollback(struct task_struct * task,struct pt_regs * regs)15 static inline void syscall_rollback(struct task_struct *task,
16 struct pt_regs *regs)
17 {
18 /* TODO. */
19 }
20
syscall_get_error(struct task_struct * task,struct pt_regs * regs)21 static inline long syscall_get_error(struct task_struct *task,
22 struct pt_regs *regs)
23 {
24 return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
25 }
26
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)27 static inline long syscall_get_return_value(struct task_struct *task,
28 struct pt_regs *regs)
29 {
30 return regs->r3;
31 }
32
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)33 static inline void syscall_set_return_value(struct task_struct *task,
34 struct pt_regs *regs,
35 int error, long val)
36 {
37 if (error)
38 regs->r3 = -error;
39 else
40 regs->r3 = val;
41 }
42
microblaze_get_syscall_arg(struct pt_regs * regs,unsigned int n)43 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
44 unsigned int n)
45 {
46 switch (n) {
47 case 5: return regs->r10;
48 case 4: return regs->r9;
49 case 3: return regs->r8;
50 case 2: return regs->r7;
51 case 1: return regs->r6;
52 case 0: return regs->r5;
53 default:
54 BUG();
55 }
56 return ~0;
57 }
58
microblaze_set_syscall_arg(struct pt_regs * regs,unsigned int n,unsigned long val)59 static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
60 unsigned int n,
61 unsigned long val)
62 {
63 switch (n) {
64 case 5:
65 regs->r10 = val;
66 case 4:
67 regs->r9 = val;
68 case 3:
69 regs->r8 = val;
70 case 2:
71 regs->r7 = val;
72 case 1:
73 regs->r6 = val;
74 case 0:
75 regs->r5 = val;
76 default:
77 BUG();
78 }
79 }
80
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,unsigned long * args)81 static inline void syscall_get_arguments(struct task_struct *task,
82 struct pt_regs *regs,
83 unsigned int i, unsigned int n,
84 unsigned long *args)
85 {
86 while (n--)
87 *args++ = microblaze_get_syscall_arg(regs, i++);
88 }
89
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,const unsigned long * args)90 static inline void syscall_set_arguments(struct task_struct *task,
91 struct pt_regs *regs,
92 unsigned int i, unsigned int n,
93 const unsigned long *args)
94 {
95 while (n--)
96 microblaze_set_syscall_arg(regs, i++, *args++);
97 }
98
99 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs);
100 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
101
102 #endif /* __ASM_MICROBLAZE_SYSCALL_H */
103