Linux kernel mirror (for testing)
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1/*
2 * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * Copyright 2015 Regents of the University of California, Berkeley
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation, version 2.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * See asm-generic/syscall.h for descriptions of what we must do here.
16 */
17
18#ifndef _ASM_RISCV_SYSCALL_H
19#define _ASM_RISCV_SYSCALL_H
20
21#include <uapi/linux/audit.h>
22#include <linux/sched.h>
23#include <linux/err.h>
24
25/* The array of function pointers for syscalls. */
26extern void *sys_call_table[];
27
28/*
29 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
30 * This importantly ignores the high bits on 64-bit, so comparisons
31 * sign-extend the low 32 bits.
32 */
33static inline int syscall_get_nr(struct task_struct *task,
34 struct pt_regs *regs)
35{
36 return regs->a7;
37}
38
39static inline void syscall_set_nr(struct task_struct *task,
40 struct pt_regs *regs,
41 int sysno)
42{
43 regs->a7 = sysno;
44}
45
46static inline void syscall_rollback(struct task_struct *task,
47 struct pt_regs *regs)
48{
49 regs->a0 = regs->orig_a0;
50}
51
52static inline long syscall_get_error(struct task_struct *task,
53 struct pt_regs *regs)
54{
55 unsigned long error = regs->a0;
56
57 return IS_ERR_VALUE(error) ? error : 0;
58}
59
60static inline long syscall_get_return_value(struct task_struct *task,
61 struct pt_regs *regs)
62{
63 return regs->a0;
64}
65
66static inline void syscall_set_return_value(struct task_struct *task,
67 struct pt_regs *regs,
68 int error, long val)
69{
70 regs->a0 = (long) error ?: val;
71}
72
73static inline void syscall_get_arguments(struct task_struct *task,
74 struct pt_regs *regs,
75 unsigned int i, unsigned int n,
76 unsigned long *args)
77{
78 BUG_ON(i + n > 6);
79 if (i == 0) {
80 args[0] = regs->orig_a0;
81 args++;
82 i++;
83 n--;
84 }
85 memcpy(args, ®s->a1 + i * sizeof(regs->a1), n * sizeof(args[0]));
86}
87
88static inline void syscall_set_arguments(struct task_struct *task,
89 struct pt_regs *regs,
90 unsigned int i, unsigned int n,
91 const unsigned long *args)
92{
93 BUG_ON(i + n > 6);
94 if (i == 0) {
95 regs->orig_a0 = args[0];
96 args++;
97 i++;
98 n--;
99 }
100 memcpy(®s->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
101}
102
103static inline int syscall_get_arch(void)
104{
105#ifdef CONFIG_64BIT
106 return AUDIT_ARCH_RISCV64;
107#else
108 return AUDIT_ARCH_RISCV32;
109#endif
110}
111
112#endif /* _ASM_RISCV_SYSCALL_H */