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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_set_nr(struct task_struct *task,
32 struct pt_regs *regs,
33 int sysno)
34{
35 regs->a7 = sysno;
36}
37
38static inline void syscall_rollback(struct task_struct *task,
39 struct pt_regs *regs)
40{
41 regs->a0 = regs->orig_a0;
42}
43
44static inline long syscall_get_error(struct task_struct *task,
45 struct pt_regs *regs)
46{
47 unsigned long error = regs->a0;
48
49 return IS_ERR_VALUE(error) ? error : 0;
50}
51
52static inline long syscall_get_return_value(struct task_struct *task,
53 struct pt_regs *regs)
54{
55 return regs->a0;
56}
57
58static inline void syscall_set_return_value(struct task_struct *task,
59 struct pt_regs *regs,
60 int error, long val)
61{
62 regs->a0 = (long) error ?: val;
63}
64
65static inline void syscall_get_arguments(struct task_struct *task,
66 struct pt_regs *regs,
67 unsigned long *args)
68{
69 args[0] = regs->orig_a0;
70 args++;
71 memcpy(args, ®s->a1, 5 * sizeof(args[0]));
72}
73
74static inline void syscall_set_arguments(struct task_struct *task,
75 struct pt_regs *regs,
76 const unsigned long *args)
77{
78 regs->orig_a0 = args[0];
79 args++;
80 memcpy(®s->a1, args, 5 * sizeof(regs->a1));
81}
82
83static inline int syscall_get_arch(struct task_struct *task)
84{
85#ifdef CONFIG_64BIT
86 return AUDIT_ARCH_RISCV64;
87#else
88 return AUDIT_ARCH_RISCV32;
89#endif
90}
91
92#endif /* _ASM_RISCV_SYSCALL_H */