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 * const 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_rollback(struct task_struct * task,struct pt_regs * regs)31 static inline void syscall_rollback(struct task_struct *task,
32 struct pt_regs *regs)
33 {
34 regs->a0 = regs->orig_a0;
35 }
36
syscall_get_error(struct task_struct * task,struct pt_regs * regs)37 static inline long syscall_get_error(struct task_struct *task,
38 struct pt_regs *regs)
39 {
40 unsigned long error = regs->a0;
41
42 return IS_ERR_VALUE(error) ? error : 0;
43 }
44
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)45 static inline long syscall_get_return_value(struct task_struct *task,
46 struct pt_regs *regs)
47 {
48 return regs->a0;
49 }
50
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)51 static inline void syscall_set_return_value(struct task_struct *task,
52 struct pt_regs *regs,
53 int error, long val)
54 {
55 regs->a0 = (long) error ?: val;
56 }
57
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)58 static inline void syscall_get_arguments(struct task_struct *task,
59 struct pt_regs *regs,
60 unsigned long *args)
61 {
62 args[0] = regs->orig_a0;
63 args++;
64 memcpy(args, ®s->a1, 5 * sizeof(args[0]));
65 }
66
syscall_get_arch(struct task_struct * task)67 static inline int syscall_get_arch(struct task_struct *task)
68 {
69 #ifdef CONFIG_64BIT
70 return AUDIT_ARCH_RISCV64;
71 #else
72 return AUDIT_ARCH_RISCV32;
73 #endif
74 }
75
76 asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
77 #endif /* _ASM_RISCV_SYSCALL_H */
78