1/*
2 * Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 *
5 *   This program is free software; you can redistribute it and/or
6 *   modify it under the terms of the GNU General Public License
7 *   as published by the Free Software Foundation, version 2.
8 *
9 *   This program is distributed in the hope that it will be useful, but
10 *   WITHOUT ANY WARRANTY; without even the implied warranty of
11 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
12 *   NON INFRINGEMENT.  See the GNU General Public License for
13 *   more details.
14 *
15 * See asm-generic/syscall.h for descriptions of what we must do here.
16 */
17
18#ifndef _ASM_TILE_SYSCALL_H
19#define _ASM_TILE_SYSCALL_H
20
21#include <linux/sched.h>
22#include <linux/err.h>
23#include <arch/abi.h>
24
25/* The array of function pointers for syscalls. */
26extern void *sys_call_table[];
27#ifdef CONFIG_COMPAT
28extern void *compat_sys_call_table[];
29#endif
30
31/*
32 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
33 * This importantly ignores the high bits on 64-bit, so comparisons
34 * sign-extend the low 32 bits.
35 */
36static inline int syscall_get_nr(struct task_struct *t, struct pt_regs *regs)
37{
38	return regs->regs[TREG_SYSCALL_NR];
39}
40
41static inline void syscall_rollback(struct task_struct *task,
42				    struct pt_regs *regs)
43{
44	regs->regs[0] = regs->orig_r0;
45}
46
47static inline long syscall_get_error(struct task_struct *task,
48				     struct pt_regs *regs)
49{
50	unsigned long error = regs->regs[0];
51	return IS_ERR_VALUE(error) ? error : 0;
52}
53
54static inline long syscall_get_return_value(struct task_struct *task,
55					    struct pt_regs *regs)
56{
57	return regs->regs[0];
58}
59
60static inline void syscall_set_return_value(struct task_struct *task,
61					    struct pt_regs *regs,
62					    int error, long val)
63{
64	regs->regs[0] = (long) error ?: val;
65}
66
67static inline void syscall_get_arguments(struct task_struct *task,
68					 struct pt_regs *regs,
69					 unsigned int i, unsigned int n,
70					 unsigned long *args)
71{
72	BUG_ON(i + n > 6);
73	memcpy(args, &regs[i], n * sizeof(args[0]));
74}
75
76static inline void syscall_set_arguments(struct task_struct *task,
77					 struct pt_regs *regs,
78					 unsigned int i, unsigned int n,
79					 const unsigned long *args)
80{
81	BUG_ON(i + n > 6);
82	memcpy(&regs[i], args, n * sizeof(args[0]));
83}
84
85#endif	/* _ASM_TILE_SYSCALL_H */
86