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
11 extern void *sys_call_table[];
12
13 static inline int
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)14 syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
15 {
16 return regs_syscallid(regs);
17 }
18
19 static inline void
syscall_set_nr(struct task_struct * task,struct pt_regs * regs,int sysno)20 syscall_set_nr(struct task_struct *task, struct pt_regs *regs,
21 int sysno)
22 {
23 regs_syscallid(regs) = sysno;
24 }
25
26 static inline void
syscall_rollback(struct task_struct * task,struct pt_regs * regs)27 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
28 {
29 regs->a0 = regs->orig_a0;
30 }
31
32 static inline long
syscall_get_error(struct task_struct * task,struct pt_regs * regs)33 syscall_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
40 static inline long
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)41 syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
42 {
43 return regs->a0;
44 }
45
46 static inline void
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)47 syscall_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
53 static inline void
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)54 syscall_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, ®s->a1, 5 * sizeof(args[0]));
60 }
61
62 static inline void
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,const unsigned long * args)63 syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
64 const unsigned long *args)
65 {
66 regs->orig_a0 = args[0];
67 args++;
68 memcpy(®s->a1, args, 5 * sizeof(regs->a1));
69 }
70
71 static inline int
syscall_get_arch(struct task_struct * task)72 syscall_get_arch(struct task_struct *task)
73 {
74 return AUDIT_ARCH_CSKY;
75 }
76
77 #endif /* __ASM_SYSCALL_H */
78