1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_MICROBLAZE_SYSCALL_H
3#define __ASM_MICROBLAZE_SYSCALL_H
4
5#include <uapi/linux/audit.h>
6#include <linux/kernel.h>
7#include <linux/sched.h>
8#include <asm/ptrace.h>
9
10/* The system call number is given by the user in R12 */
11static inline long syscall_get_nr(struct task_struct *task,
12				  struct pt_regs *regs)
13{
14	return regs->r12;
15}
16
17static inline void syscall_rollback(struct task_struct *task,
18				    struct pt_regs *regs)
19{
20	/* TODO.  */
21}
22
23static inline long syscall_get_error(struct task_struct *task,
24				     struct pt_regs *regs)
25{
26	return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
27}
28
29static inline long syscall_get_return_value(struct task_struct *task,
30					    struct pt_regs *regs)
31{
32	return regs->r3;
33}
34
35static inline void syscall_set_return_value(struct task_struct *task,
36					    struct pt_regs *regs,
37					    int error, long val)
38{
39	if (error)
40		regs->r3 = -error;
41	else
42		regs->r3 = val;
43}
44
45static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
46							  unsigned int n)
47{
48	switch (n) {
49	case 5: return regs->r10;
50	case 4: return regs->r9;
51	case 3: return regs->r8;
52	case 2: return regs->r7;
53	case 1: return regs->r6;
54	case 0: return regs->r5;
55	default:
56		BUG();
57	}
58	return ~0;
59}
60
61static inline void syscall_get_arguments(struct task_struct *task,
62					 struct pt_regs *regs,
63					 unsigned long *args)
64{
65	unsigned int i = 0;
66	unsigned int n = 6;
67
68	while (n--)
69		*args++ = microblaze_get_syscall_arg(regs, i++);
70}
71
72asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
73asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
74
75static inline int syscall_get_arch(struct task_struct *task)
76{
77	return AUDIT_ARCH_MICROBLAZE;
78}
79#endif /* __ASM_MICROBLAZE_SYSCALL_H */
80