1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_MICROBLAZE_SYSCALL_H
3 #define __ASM_MICROBLAZE_SYSCALL_H
4 
5 #include <uapi/linux/audit.h>
6 #include <linux/kernel.h>
7 #include <linux/sched.h>
8 #include <asm/ptrace.h>
9 
10 /* The system call number is given by the user in R12 */
11 static inline long syscall_get_nr(struct task_struct *task,
12 				  struct pt_regs *regs)
13 {
14 	return regs->r12;
15 }
16 
17 static inline void syscall_rollback(struct task_struct *task,
18 				    struct pt_regs *regs)
19 {
20 	/* TODO.  */
21 }
22 
23 static inline long syscall_get_error(struct task_struct *task,
24 				     struct pt_regs *regs)
25 {
26 	return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
27 }
28 
29 static inline long syscall_get_return_value(struct task_struct *task,
30 					    struct pt_regs *regs)
31 {
32 	return regs->r3;
33 }
34 
35 static inline void syscall_set_return_value(struct task_struct *task,
36 					    struct pt_regs *regs,
37 					    int error, long val)
38 {
39 	if (error)
40 		regs->r3 = -error;
41 	else
42 		regs->r3 = val;
43 }
44 
45 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
46 							  unsigned int n)
47 {
48 	switch (n) {
49 	case 5: return regs->r10;
50 	case 4: return regs->r9;
51 	case 3: return regs->r8;
52 	case 2: return regs->r7;
53 	case 1: return regs->r6;
54 	case 0: return regs->r5;
55 	default:
56 		BUG();
57 	}
58 	return ~0;
59 }
60 
61 static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
62 					      unsigned int n,
63 					      unsigned long val)
64 {
65 	switch (n) {
66 	case 5:
67 		regs->r10 = val;
68 	case 4:
69 		regs->r9 = val;
70 	case 3:
71 		regs->r8 = val;
72 	case 2:
73 		regs->r7 = val;
74 	case 1:
75 		regs->r6 = val;
76 	case 0:
77 		regs->r5 = val;
78 	default:
79 		BUG();
80 	}
81 }
82 
83 static inline void syscall_get_arguments(struct task_struct *task,
84 					 struct pt_regs *regs,
85 					 unsigned long *args)
86 {
87 	unsigned int i = 0;
88 	unsigned int n = 6;
89 
90 	while (n--)
91 		*args++ = microblaze_get_syscall_arg(regs, i++);
92 }
93 
94 static inline void syscall_set_arguments(struct task_struct *task,
95 					 struct pt_regs *regs,
96 					 const unsigned long *args)
97 {
98 	unsigned int i = 0;
99 	unsigned int n = 6;
100 
101 	while (n--)
102 		microblaze_set_syscall_arg(regs, i++, *args++);
103 }
104 
105 asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
106 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
107 
108 static inline int syscall_get_arch(struct task_struct *task)
109 {
110 	return AUDIT_ARCH_MICROBLAZE;
111 }
112 #endif /* __ASM_MICROBLAZE_SYSCALL_H */
113