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
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)13 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
14 {
15 return regs->r2;
16 }
17
syscall_set_nr(struct task_struct * task,struct pt_regs * regs,int nr)18 static inline void syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
19 {
20 regs->r2 = nr;
21 }
22
syscall_rollback(struct task_struct * task,struct pt_regs * regs)23 static 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
syscall_get_error(struct task_struct * task,struct pt_regs * regs)30 static inline long syscall_get_error(struct task_struct *task,
31 struct pt_regs *regs)
32 {
33 return regs->r7 ? regs->r2 : 0;
34 }
35
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)36 static inline long syscall_get_return_value(struct task_struct *task,
37 struct pt_regs *regs)
38 {
39 return regs->r2;
40 }
41
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)42 static 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
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)55 static 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
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,const unsigned long * args)66 static 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
syscall_get_arch(struct task_struct * task)77 static inline int syscall_get_arch(struct task_struct *task)
78 {
79 return AUDIT_ARCH_NIOS2;
80 }
81
82 #endif
83