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 */