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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 * const sys_call_table[];
19extern void * const compat_sys_call_table[];
20
21/*
22 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
23 * This importantly ignores the high bits on 64-bit, so comparisons
24 * sign-extend the low 32 bits.
25 */
26static inline int syscall_get_nr(struct task_struct *task,
27 struct pt_regs *regs)
28{
29 return regs->a7;
30}
31
32static inline void syscall_rollback(struct task_struct *task,
33 struct pt_regs *regs)
34{
35 regs->a0 = regs->orig_a0;
36}
37
38static inline long syscall_get_error(struct task_struct *task,
39 struct pt_regs *regs)
40{
41 unsigned long error = regs->a0;
42
43 return IS_ERR_VALUE(error) ? error : 0;
44}
45
46static inline long syscall_get_return_value(struct task_struct *task,
47 struct pt_regs *regs)
48{
49 return regs->a0;
50}
51
52static inline void syscall_set_return_value(struct task_struct *task,
53 struct pt_regs *regs,
54 int error, long val)
55{
56 regs->a0 = (long) error ?: val;
57}
58
59static inline void syscall_get_arguments(struct task_struct *task,
60 struct pt_regs *regs,
61 unsigned long *args)
62{
63 args[0] = regs->orig_a0;
64 args++;
65 memcpy(args, ®s->a1, 5 * sizeof(args[0]));
66}
67
68static inline int syscall_get_arch(struct task_struct *task)
69{
70#ifdef CONFIG_64BIT
71 return AUDIT_ARCH_RISCV64;
72#else
73 return AUDIT_ARCH_RISCV32;
74#endif
75}
76
77asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
78#endif /* _ASM_RISCV_SYSCALL_H */