syscall.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright Altera Corporation (C) <2014>. All rights reserved
 4 */
 5
 6#ifndef __ASM_NIOS2_SYSCALL_H__
 7#define __ASM_NIOS2_SYSCALL_H__
 8
 9#include <uapi/linux/audit.h>
10#include <linux/err.h>
11#include <linux/sched.h>
12
13static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
14{
15	return regs->r2;
16}
17
18static inline void syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
19{
20	regs->r2 = nr;
21}
22
23static inline void syscall_rollback(struct task_struct *task,
24				struct pt_regs *regs)
25{
26	regs->r2 = regs->orig_r2;
27	regs->r7 = regs->orig_r7;
28}
29
30static inline long syscall_get_error(struct task_struct *task,
31				struct pt_regs *regs)
32{
33	return regs->r7 ? regs->r2 : 0;
34}
35
36static inline long syscall_get_return_value(struct task_struct *task,
37	struct pt_regs *regs)
38{
39	return regs->r2;
40}
41
42static inline void syscall_set_return_value(struct task_struct *task,
43	struct pt_regs *regs, int error, long val)
44{
45	if (error) {
46		/* error < 0, but nios2 uses > 0 return value */
47		regs->r2 = -error;
48		regs->r7 = 1;
49	} else {
50		regs->r2 = val;
51		regs->r7 = 0;
52	}
53}
54
55static inline void syscall_get_arguments(struct task_struct *task,
56	struct pt_regs *regs, unsigned long *args)
57{
58	*args++ = regs->r4;
59	*args++ = regs->r5;
60	*args++ = regs->r6;
61	*args++ = regs->r7;
62	*args++ = regs->r8;
63	*args   = regs->r9;
64}
65
66static inline void syscall_set_arguments(struct task_struct *task,
67	struct pt_regs *regs, const unsigned long *args)
68{
69	regs->r4 = *args++;
70	regs->r5 = *args++;
71	regs->r6 = *args++;
72	regs->r7 = *args++;
73	regs->r8 = *args++;
74	regs->r9 = *args;
75}
76
77static inline int syscall_get_arch(struct task_struct *task)
78{
79	return AUDIT_ARCH_NIOS2;
80}
81
82#endif