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1 | /* |
2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #ifndef _ASM_ARC_SYSCALL_H | |
10 | #define _ASM_ARC_SYSCALL_H 1 | |
11 | ||
12 | #include <linux/err.h> | |
13 | #include <linux/sched.h> | |
14 | #include <asm/unistd.h> | |
15 | #include <asm/ptrace.h> /* in_syscall() */ | |
16 | ||
17 | static inline long | |
18 | syscall_get_nr(struct task_struct *task, struct pt_regs *regs) | |
19 | { | |
20 | if (user_mode(regs) && in_syscall(regs)) | |
352c1d95 | 21 | return regs->r8; |
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22 | else |
23 | return -1; | |
24 | } | |
25 | ||
26 | static inline void | |
27 | syscall_rollback(struct task_struct *task, struct pt_regs *regs) | |
28 | { | |
352c1d95 | 29 | regs->r0 = regs->orig_r0; |
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30 | } |
31 | ||
32 | static inline long | |
33 | syscall_get_error(struct task_struct *task, struct pt_regs *regs) | |
34 | { | |
35 | /* 0 if syscall succeeded, otherwise -Errorcode */ | |
36 | return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0; | |
37 | } | |
38 | ||
39 | static inline long | |
40 | syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) | |
41 | { | |
42 | return regs->r0; | |
43 | } | |
44 | ||
45 | static inline void | |
46 | syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, | |
47 | int error, long val) | |
48 | { | |
49 | regs->r0 = (long) error ?: val; | |
50 | } | |
51 | ||
52 | /* | |
53 | * @i: argument index [0,5] | |
54 | * @n: number of arguments; n+i must be [1,6]. | |
55 | */ | |
56 | static inline void | |
57 | syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, | |
58 | unsigned int i, unsigned int n, unsigned long *args) | |
59 | { | |
60 | unsigned long *inside_ptregs = &(regs->r0); | |
61 | inside_ptregs -= i; | |
62 | ||
63 | BUG_ON((i + n) > 6); | |
64 | ||
65 | while (n--) { | |
66 | args[i++] = (*inside_ptregs); | |
67 | inside_ptregs--; | |
68 | } | |
69 | } | |
70 | ||
71 | #endif |