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81 lines · 1.7 KiB

1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __ASM_SYSCALL_H
4#define __ASM_SYSCALL_H
5
6#include <linux/sched.h>
7#include <linux/err.h>
8#include <abi/regdef.h>
9#include <uapi/linux/audit.h>
10
11extern void *sys_call_table[];
12
13static inline int
14syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
15{
16 return regs_syscallid(regs);
17}
18
19static inline void
20syscall_set_nr(struct task_struct *task, struct pt_regs *regs,
21 int sysno)
22{
23 regs_syscallid(regs) = sysno;
24}
25
26static inline void
27syscall_rollback(struct task_struct *task, struct pt_regs *regs)
28{
29 regs->a0 = regs->orig_a0;
30}
31
32static inline long
33syscall_get_error(struct task_struct *task, struct pt_regs *regs)
34{
35 unsigned long error = regs->a0;
36
37 return IS_ERR_VALUE(error) ? error : 0;
38}
39
40static inline long
41syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
42{
43 return regs->a0;
44}
45
46static inline void
47syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
48 int error, long val)
49{
50 regs->a0 = (long) error ?: val;
51}
52
53static inline void
54syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
55 unsigned long *args)
56{
57 args[0] = regs->orig_a0;
58 args++;
59 memcpy(args, &regs->a1, 5 * sizeof(args[0]));
60}
61
62static inline void
63syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
64 const unsigned long *args)
65{
66 memcpy(&regs->a0, args, 6 * sizeof(regs->a0));
67 /*
68 * Also copy the first argument into orig_a0
69 * so that syscall_get_arguments() would return it
70 * instead of the previous value.
71 */
72 regs->orig_a0 = regs->a0;
73}
74
75static inline int
76syscall_get_arch(struct task_struct *task)
77{
78 return AUDIT_ARCH_CSKY;
79}
80
81#endif /* __ASM_SYSCALL_H */