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gerrit.openfyde.cn / github.com / raspberrypi / raspberrypi-kernel / b35f549df1d7520d37ba1e6d4a8d4df6bd52d136 / . / arch / um / include / asm / syscall-generic.h
blob: 25d00acd1322cf5152e971b201d04d12aee1e4b4 [file] [log] [blame]
Mickaël Salaünd8f8b842015-12-29 21:35:46 +0100[diff] [blame]1/*
2 * Access to user system call parameters and results
3 *
4 * See asm-generic/syscall.h for function descriptions.
5 *
6 * Copyright (C) 2015 Mickaël Salaün <mic@digikod.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#ifndef __UM_SYSCALL_GENERIC_H
14#define __UM_SYSCALL_GENERIC_H
15
16#include <asm/ptrace.h>
17#include <linux/err.h>
18#include <linux/sched.h>
19#include <sysdep/ptrace.h>
20
21static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
22{
23
24 return PT_REGS_SYSCALL_NR(regs);
25}
26
27static inline void syscall_rollback(struct task_struct *task,
28 struct pt_regs *regs)
29{
30 /* do nothing */
31}
32
33static inline long syscall_get_error(struct task_struct *task,
34 struct pt_regs *regs)
35{
36 const long error = regs_return_value(regs);
37
38 return IS_ERR_VALUE(error) ? error : 0;
39}
40
41static inline long syscall_get_return_value(struct task_struct *task,
42 struct pt_regs *regs)
43{
44 return regs_return_value(regs);
45}
46
47static inline void syscall_set_return_value(struct task_struct *task,
48 struct pt_regs *regs,
49 int error, long val)
50{
51 PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
52}
53
54static inline void syscall_get_arguments(struct task_struct *task,
55 struct pt_regs *regs,
Mickaël Salaünd8f8b842015-12-29 21:35:46 +0100[diff] [blame]56 unsigned long *args)
57{
58 const struct uml_pt_regs *r = &regs->regs;
59
Steven Rostedt (Red Hat)b35f5492016-11-07 16:26:37 -0500[diff] [blame^]60 *args++ = UPT_SYSCALL_ARG1(r);
61 *args++ = UPT_SYSCALL_ARG2(r);
62 *args++ = UPT_SYSCALL_ARG3(r);
63 *args++ = UPT_SYSCALL_ARG4(r);
64 *args++ = UPT_SYSCALL_ARG5(r);
65 *args = UPT_SYSCALL_ARG6(r);
Mickaël Salaünd8f8b842015-12-29 21:35:46 +0100[diff] [blame]66}
67
68static inline void syscall_set_arguments(struct task_struct *task,
69 struct pt_regs *regs,
70 unsigned int i, unsigned int n,
71 const unsigned long *args)
72{
73 struct uml_pt_regs *r = &regs->regs;
74
75 switch (i) {
76 case 0:
77 if (!n--)
78 break;
79 UPT_SYSCALL_ARG1(r) = *args++;
80 case 1:
81 if (!n--)
82 break;
83 UPT_SYSCALL_ARG2(r) = *args++;
84 case 2:
85 if (!n--)
86 break;
87 UPT_SYSCALL_ARG3(r) = *args++;
88 case 3:
89 if (!n--)
90 break;
91 UPT_SYSCALL_ARG4(r) = *args++;
92 case 4:
93 if (!n--)
94 break;
95 UPT_SYSCALL_ARG5(r) = *args++;
96 case 5:
97 if (!n--)
98 break;
99 UPT_SYSCALL_ARG6(r) = *args++;
100 case 6:
101 if (!n--)
102 break;
103 default:
104 BUG();
105 break;
106 }
107}
108
109/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
110
111#endif /* __UM_SYSCALL_GENERIC_H */