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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 */
11static inline long syscall_get_nr(struct task_struct *task,
12 struct pt_regs *regs)
13{
14 return regs->r12;
15}
16
17static inline void syscall_rollback(struct task_struct *task,
18 struct pt_regs *regs)
19{
20 /* TODO. */
21}
22
23static 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
29static inline long syscall_get_return_value(struct task_struct *task,
30 struct pt_regs *regs)
31{
32 return regs->r3;
33}
34
35static 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
45static 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
61static 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
83static inline void syscall_get_arguments(struct task_struct *task,
84 struct pt_regs *regs,
85 unsigned int i, unsigned int n,
86 unsigned long *args)
87{
88 while (n--)
89 *args++ = microblaze_get_syscall_arg(regs, i++);
90}
91
92static inline void syscall_set_arguments(struct task_struct *task,
93 struct pt_regs *regs,
94 unsigned int i, unsigned int n,
95 const unsigned long *args)
96{
97 while (n--)
98 microblaze_set_syscall_arg(regs, i++, *args++);
99}
100
101asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
102asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
103
104static inline int syscall_get_arch(void)
105{
106 return AUDIT_ARCH_MICROBLAZE;
107}
108#endif /* __ASM_MICROBLAZE_SYSCALL_H */