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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 <asm/hwprobe.h>
14#include <uapi/linux/audit.h>
15#include <linux/sched.h>
16#include <linux/err.h>
17
18/* The array of function pointers for syscalls. */
19extern void * const sys_call_table[];
20extern void * const compat_sys_call_table[];
21
22/*
23 * Only the low 32 bits of orig_a0 are meaningful, so we return int.
24 * This importantly ignores the high bits on 64-bit, so comparisons
25 * sign-extend the low 32 bits.
26 */
27static inline int syscall_get_nr(struct task_struct *task,
28 struct pt_regs *regs)
29{
30 return regs->a7;
31}
32
33static inline void syscall_set_nr(struct task_struct *task,
34 struct pt_regs *regs,
35 int nr)
36{
37 regs->a7 = nr;
38}
39
40static inline void syscall_rollback(struct task_struct *task,
41 struct pt_regs *regs)
42{
43 regs->a0 = regs->orig_a0;
44}
45
46static inline long syscall_get_error(struct task_struct *task,
47 struct pt_regs *regs)
48{
49 unsigned long error = regs->a0;
50
51 return IS_ERR_VALUE(error) ? error : 0;
52}
53
54static inline long syscall_get_return_value(struct task_struct *task,
55 struct pt_regs *regs)
56{
57 return regs->a0;
58}
59
60static inline void syscall_set_return_value(struct task_struct *task,
61 struct pt_regs *regs,
62 int error, long val)
63{
64 regs->a0 = (long) error ?: val;
65}
66
67static inline void syscall_get_arguments(struct task_struct *task,
68 struct pt_regs *regs,
69 unsigned long *args)
70{
71 args[0] = regs->orig_a0;
72 args[1] = regs->a1;
73 args[2] = regs->a2;
74 args[3] = regs->a3;
75 args[4] = regs->a4;
76 args[5] = regs->a5;
77}
78
79static inline void syscall_set_arguments(struct task_struct *task,
80 struct pt_regs *regs,
81 const unsigned long *args)
82{
83 regs->orig_a0 = args[0];
84 regs->a1 = args[1];
85 regs->a2 = args[2];
86 regs->a3 = args[3];
87 regs->a4 = args[4];
88 regs->a5 = args[5];
89}
90
91static inline int syscall_get_arch(struct task_struct *task)
92{
93#ifdef CONFIG_64BIT
94 return AUDIT_ARCH_RISCV64;
95#else
96 return AUDIT_ARCH_RISCV32;
97#endif
98}
99
100typedef long (*syscall_t)(const struct pt_regs *);
101static inline void syscall_handler(struct pt_regs *regs, ulong syscall)
102{
103 syscall_t fn;
104
105#ifdef CONFIG_COMPAT
106 if ((regs->status & SR_UXL) == SR_UXL_32)
107 fn = compat_sys_call_table[syscall];
108 else
109#endif
110 fn = sys_call_table[syscall];
111
112 regs->a0 = fn(regs);
113}
114
115asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
116
117asmlinkage long sys_riscv_hwprobe(struct riscv_hwprobe *, size_t, size_t,
118 unsigned long *, unsigned int);
119#endif /* _ASM_RISCV_SYSCALL_H */