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
18 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
19 {
20
21 return PT_REGS_SYSCALL_NR(regs);
22 }
23
24 static inline void syscall_rollback(struct task_struct *task,
25 struct pt_regs *regs)
26 {
27 /* do nothing */
28 }
29
30 static 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
38 static inline long syscall_get_return_value(struct task_struct *task,
39 struct pt_regs *regs)
40 {
41 return regs_return_value(regs);
42 }
43
44 static 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
51 static 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 = ®s->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 */
68
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