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 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
94static 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
105asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
106asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
107
108static inline int syscall_get_arch(struct task_struct *task)
109{
110	return AUDIT_ARCH_MICROBLAZE;
111}
112#endif /* __ASM_MICROBLAZE_SYSCALL_H */
113