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
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.
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.
15 * See asm-generic/syscall.h for descriptions of what we must do here.
18 #ifndef _ASM_RISCV_SYSCALL_H
19 #define _ASM_RISCV_SYSCALL_H
21 #include <linux/sched.h>
22 #include <linux/err.h>
24 /* The array of function pointers for syscalls. */
25 extern void *sys_call_table[];
28 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
29 * This importantly ignores the high bits on 64-bit, so comparisons
30 * sign-extend the low 32 bits.
32 static inline int syscall_get_nr(struct task_struct *task,
38 static inline void syscall_set_nr(struct task_struct *task,
45 static inline void syscall_rollback(struct task_struct *task,
48 regs->a0 = regs->orig_a0;
51 static inline long syscall_get_error(struct task_struct *task,
54 unsigned long error = regs->a0;
56 return IS_ERR_VALUE(error) ? error : 0;
59 static inline long syscall_get_return_value(struct task_struct *task,
65 static inline void syscall_set_return_value(struct task_struct *task,
69 regs->a0 = (long) error ?: val;
72 static inline void syscall_get_arguments(struct task_struct *task,
74 unsigned int i, unsigned int n,
79 args[0] = regs->orig_a0;
84 memcpy(args, ®s->a1 + i * sizeof(regs->a1), n * sizeof(args[0]));
87 static inline void syscall_set_arguments(struct task_struct *task,
89 unsigned int i, unsigned int n,
90 const unsigned long *args)
94 regs->orig_a0 = args[0];
99 memcpy(®s->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
102 #endif /* _ASM_RISCV_SYSCALL_H */