1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Access to user system call parameters and results
 4 *
 5 * See asm-generic/syscall.h for function descriptions.
 6 *
 7 * Copyright (C) 2015 Mickaël Salaün <mic@digikod.net>
 
 
 
 
 8 */
 9
10#ifndef __UM_SYSCALL_GENERIC_H
11#define __UM_SYSCALL_GENERIC_H
12
13#include <asm/ptrace.h>
14#include <linux/err.h>
15#include <linux/sched.h>
16#include <sysdep/ptrace.h>
17
18static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
19{
20
21	return PT_REGS_SYSCALL_NR(regs);
22}
23
24static inline void syscall_rollback(struct task_struct *task,
25				    struct pt_regs *regs)
26{
27	/* do nothing */
28}
29
30static inline long syscall_get_error(struct task_struct *task,
31				     struct pt_regs *regs)
32{
33	const long error = regs_return_value(regs);
34
35	return IS_ERR_VALUE(error) ? error : 0;
36}
37
38static inline long syscall_get_return_value(struct task_struct *task,
39					    struct pt_regs *regs)
40{
41	return regs_return_value(regs);
42}
43
44static inline void syscall_set_return_value(struct task_struct *task,
45					    struct pt_regs *regs,
46					    int error, long val)
47{
48	PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
49}
50
51static inline void syscall_get_arguments(struct task_struct *task,
52					 struct pt_regs *regs,
 
53					 unsigned long *args)
54{
55	const struct uml_pt_regs *r = &regs->regs;
56
57	*args++ = UPT_SYSCALL_ARG1(r);
58	*args++ = UPT_SYSCALL_ARG2(r);
59	*args++ = UPT_SYSCALL_ARG3(r);
60	*args++ = UPT_SYSCALL_ARG4(r);
61	*args++ = UPT_SYSCALL_ARG5(r);
62	*args   = UPT_SYSCALL_ARG6(r);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
63}
64
65/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
66
67#endif	/* __UM_SYSCALL_GENERIC_H */

 
  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,
 56					 unsigned int i, unsigned int n,
 57					 unsigned long *args)
 58{
 59	const struct uml_pt_regs *r = &regs->regs;
 60
 61	switch (i) {
 62	case 0:
 63		if (!n--)
 64			break;
 65		*args++ = UPT_SYSCALL_ARG1(r);
 66	case 1:
 67		if (!n--)
 68			break;
 69		*args++ = UPT_SYSCALL_ARG2(r);
 70	case 2:
 71		if (!n--)
 72			break;
 73		*args++ = UPT_SYSCALL_ARG3(r);
 74	case 3:
 75		if (!n--)
 76			break;
 77		*args++ = UPT_SYSCALL_ARG4(r);
 78	case 4:
 79		if (!n--)
 80			break;
 81		*args++ = UPT_SYSCALL_ARG5(r);
 82	case 5:
 83		if (!n--)
 84			break;
 85		*args++ = UPT_SYSCALL_ARG6(r);
 86	case 6:
 87		if (!n--)
 88			break;
 89	default:
 90		BUG();
 91		break;
 92	}
 93}
 94
 95static inline void syscall_set_arguments(struct task_struct *task,
 96					 struct pt_regs *regs,
 97					 unsigned int i, unsigned int n,
 98					 const unsigned long *args)
 99{
100	struct uml_pt_regs *r = &regs->regs;
101
102	switch (i) {
103	case 0:
104		if (!n--)
105			break;
106		UPT_SYSCALL_ARG1(r) = *args++;
107	case 1:
108		if (!n--)
109			break;
110		UPT_SYSCALL_ARG2(r) = *args++;
111	case 2:
112		if (!n--)
113			break;
114		UPT_SYSCALL_ARG3(r) = *args++;
115	case 3:
116		if (!n--)
117			break;
118		UPT_SYSCALL_ARG4(r) = *args++;
119	case 4:
120		if (!n--)
121			break;
122		UPT_SYSCALL_ARG5(r) = *args++;
123	case 5:
124		if (!n--)
125			break;
126		UPT_SYSCALL_ARG6(r) = *args++;
127	case 6:
128		if (!n--)
129			break;
130	default:
131		BUG();
132		break;
133	}
134}
135
136/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
137
138#endif	/* __UM_SYSCALL_GENERIC_H */