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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
4 * Copyright 2010 Tilera Corporation. All Rights Reserved.
5 * Copyright 2015 Regents of the University of California, Berkeley
6 *
7 * See asm-generic/syscall.h for descriptions of what we must do here.
8 */
9
10#ifndef _ASM_RISCV_SYSCALL_H
11#define _ASM_RISCV_SYSCALL_H
12
13#include <uapi/linux/audit.h>
14#include <linux/sched.h>
15#include <linux/err.h>
16
17/* The array of function pointers for syscalls. */
18extern void *sys_call_table[];
19
20/*
21 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
22 * This importantly ignores the high bits on 64-bit, so comparisons
23 * sign-extend the low 32 bits.
24 */
25static inline int syscall_get_nr(struct task_struct *task,
26 struct pt_regs *regs)
27{
28 return regs->a7;
29}
30
31static inline void syscall_rollback(struct task_struct *task,
32 struct pt_regs *regs)
33{
34 regs->a0 = regs->orig_a0;
35}
36
37static inline long syscall_get_error(struct task_struct *task,
38 struct pt_regs *regs)
39{
40 unsigned long error = regs->a0;
41
42 return IS_ERR_VALUE(error) ? error : 0;
43}
44
45static inline long syscall_get_return_value(struct task_struct *task,
46 struct pt_regs *regs)
47{
48 return regs->a0;
49}
50
51static inline void syscall_set_return_value(struct task_struct *task,
52 struct pt_regs *regs,
53 int error, long val)
54{
55 regs->a0 = (long) error ?: val;
56}
57
58static inline void syscall_get_arguments(struct task_struct *task,
59 struct pt_regs *regs,
60 unsigned long *args)
61{
62 args[0] = regs->orig_a0;
63 args++;
64 memcpy(args, ®s->a1, 5 * sizeof(args[0]));
65}
66
67static inline void syscall_set_arguments(struct task_struct *task,
68 struct pt_regs *regs,
69 const unsigned long *args)
70{
71 regs->orig_a0 = args[0];
72 args++;
73 memcpy(®s->a1, args, 5 * sizeof(regs->a1));
74}
75
76static inline int syscall_get_arch(struct task_struct *task)
77{
78#ifdef CONFIG_64BIT
79 return AUDIT_ARCH_RISCV64;
80#else
81 return AUDIT_ARCH_RISCV32;
82#endif
83}
84
85#endif /* _ASM_RISCV_SYSCALL_H */