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, &regs->a1, 5 * sizeof(args[0]));
60 }
61 
62 static inline int
syscall_get_arch(struct task_struct * task)63 syscall_get_arch(struct task_struct *task)
64 {
65 	return AUDIT_ARCH_CSKY;
66 }
67 
68 #endif	/* __ASM_SYSCALL_H */
69