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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 | ||
efe75c49 | 21 | #include <uapi/linux/audit.h> |
e2c0cdfb PD |
22 | #include <linux/sched.h> |
23 | #include <linux/err.h> | |
24 | ||
25 | /* The array of function pointers for syscalls. */ | |
26 | extern 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 | */ | |
33 | static inline int syscall_get_nr(struct task_struct *task, | |
34 | struct pt_regs *regs) | |
35 | { | |
36 | return regs->a7; | |
37 | } | |
38 | ||
39 | static inline void syscall_set_nr(struct task_struct *task, | |
40 | struct pt_regs *regs, | |
41 | int sysno) | |
42 | { | |
43 | regs->a7 = sysno; | |
44 | } | |
45 | ||
46 | static inline void syscall_rollback(struct task_struct *task, | |
47 | struct pt_regs *regs) | |
48 | { | |
49 | regs->a0 = regs->orig_a0; | |
50 | } | |
51 | ||
52 | static 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 | ||
60 | static inline long syscall_get_return_value(struct task_struct *task, | |
61 | struct pt_regs *regs) | |
62 | { | |
63 | return regs->a0; | |
64 | } | |
65 | ||
66 | static 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 | ||
73 | static 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 | ||
88 | static 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 | ||
16add411 | 103 | static inline int syscall_get_arch(struct task_struct *task) |
efe75c49 DA |
104 | { |
105 | #ifdef CONFIG_64BIT | |
106 | return AUDIT_ARCH_RISCV64; | |
107 | #else | |
108 | return AUDIT_ARCH_RISCV32; | |
109 | #endif | |
110 | } | |
111 | ||
e2c0cdfb | 112 | #endif /* _ASM_RISCV_SYSCALL_H */ |