1 #ifndef __ASM_MICROBLAZE_SYSCALL_H
2 #define __ASM_MICROBLAZE_SYSCALL_H
3 
4 #include <uapi/linux/audit.h>
5 #include <linux/kernel.h>
6 #include <linux/sched.h>
7 #include <asm/ptrace.h>
8 
9 /* The system call number is given by the user in R12 */
10 static inline long syscall_get_nr(struct task_struct *task,
11 				  struct pt_regs *regs)
12 {
13 	return regs->r12;
14 }
15 
16 static inline void syscall_rollback(struct task_struct *task,
17 				    struct pt_regs *regs)
18 {
19 	/* TODO.  */
20 }
21 
22 static inline long syscall_get_error(struct task_struct *task,
23 				     struct pt_regs *regs)
24 {
25 	return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
26 }
27 
28 static inline long syscall_get_return_value(struct task_struct *task,
29 					    struct pt_regs *regs)
30 {
31 	return regs->r3;
32 }
33 
34 static inline void syscall_set_return_value(struct task_struct *task,
35 					    struct pt_regs *regs,
36 					    int error, long val)
37 {
38 	if (error)
39 		regs->r3 = -error;
40 	else
41 		regs->r3 = val;
42 }
43 
44 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
45 							  unsigned int n)
46 {
47 	switch (n) {
48 	case 5: return regs->r10;
49 	case 4: return regs->r9;
50 	case 3: return regs->r8;
51 	case 2: return regs->r7;
52 	case 1: return regs->r6;
53 	case 0: return regs->r5;
54 	default:
55 		BUG();
56 	}
57 	return ~0;
58 }
59 
60 static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
61 					      unsigned int n,
62 					      unsigned long val)
63 {
64 	switch (n) {
65 	case 5:
66 		regs->r10 = val;
67 	case 4:
68 		regs->r9 = val;
69 	case 3:
70 		regs->r8 = val;
71 	case 2:
72 		regs->r7 = val;
73 	case 1:
74 		regs->r6 = val;
75 	case 0:
76 		regs->r5 = val;
77 	default:
78 		BUG();
79 	}
80 }
81 
82 static inline void syscall_get_arguments(struct task_struct *task,
83 					 struct pt_regs *regs,
84 					 unsigned int i, unsigned int n,
85 					 unsigned long *args)
86 {
87 	while (n--)
88 		*args++ = microblaze_get_syscall_arg(regs, i++);
89 }
90 
91 static inline void syscall_set_arguments(struct task_struct *task,
92 					 struct pt_regs *regs,
93 					 unsigned int i, unsigned int n,
94 					 const unsigned long *args)
95 {
96 	while (n--)
97 		microblaze_set_syscall_arg(regs, i++, *args++);
98 }
99 
100 asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
101 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
102 
103 static inline int syscall_get_arch(void)
104 {
105 	return AUDIT_ARCH_MICROBLAZE;
106 }
107 #endif /* __ASM_MICROBLAZE_SYSCALL_H */
108