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 */
9 static inline long syscall_get_nr(struct task_struct *task,
10 				  struct pt_regs *regs)
11 {
12 	return regs->r12;
13 }
14 
15 static inline void syscall_rollback(struct task_struct *task,
16 				    struct pt_regs *regs)
17 {
18 	/* TODO.  */
19 }
20 
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 
27 static inline long syscall_get_return_value(struct task_struct *task,
28 					    struct pt_regs *regs)
29 {
30 	return regs->r3;
31 }
32 
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 
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 
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 
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 
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