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. */
26 extern void *sys_call_table[];
27 #ifdef CONFIG_COMPAT
28 extern 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 */
syscall_get_nr(struct task_struct * t,struct pt_regs * regs)36 static inline int syscall_get_nr(struct task_struct *t, struct pt_regs *regs)
37 {
38 return regs->regs[TREG_SYSCALL_NR];
39 }
40
syscall_rollback(struct task_struct * task,struct pt_regs * regs)41 static inline void syscall_rollback(struct task_struct *task,
42 struct pt_regs *regs)
43 {
44 regs->regs[0] = regs->orig_r0;
45 }
46
syscall_get_error(struct task_struct * task,struct pt_regs * regs)47 static 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
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)54 static inline long syscall_get_return_value(struct task_struct *task,
55 struct pt_regs *regs)
56 {
57 return regs->regs[0];
58 }
59
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)60 static 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
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,unsigned long * args)67 static 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, ®s[i], n * sizeof(args[0]));
74 }
75
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,const unsigned long * args)76 static 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(®s[i], args, n * sizeof(args[0]));
83 }
84
85 #endif /* _ASM_TILE_SYSCALL_H */
86