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. */
18 extern 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 */
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)25 static inline int syscall_get_nr(struct task_struct *task,
26 struct pt_regs *regs)
27 {
28 return regs->a7;
29 }
30
syscall_set_nr(struct task_struct * task,struct pt_regs * regs,int sysno)31 static inline void syscall_set_nr(struct task_struct *task,
32 struct pt_regs *regs,
33 int sysno)
34 {
35 regs->a7 = sysno;
36 }
37
syscall_rollback(struct task_struct * task,struct pt_regs * regs)38 static inline void syscall_rollback(struct task_struct *task,
39 struct pt_regs *regs)
40 {
41 regs->a0 = regs->orig_a0;
42 }
43
syscall_get_error(struct task_struct * task,struct pt_regs * regs)44 static 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
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)52 static inline long syscall_get_return_value(struct task_struct *task,
53 struct pt_regs *regs)
54 {
55 return regs->a0;
56 }
57
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)58 static 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
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)65 static 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
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,const unsigned long * args)74 static 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
syscall_get_arch(struct task_struct * task)83 static 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 */
93
