syscall.h

 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_set_nr(struct task_struct *task,
18				  struct pt_regs *regs,
19				  int nr)
20{
21	regs->r12 = nr;
22}
23
24static inline void syscall_rollback(struct task_struct *task,
25				    struct pt_regs *regs)
26{
27	/* TODO.  */
28}
29
30static inline long syscall_get_error(struct task_struct *task,
31				     struct pt_regs *regs)
32{
33	return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
34}
35
36static inline long syscall_get_return_value(struct task_struct *task,
37					    struct pt_regs *regs)
38{
39	return regs->r3;
40}
41
42static inline void syscall_set_return_value(struct task_struct *task,
43					    struct pt_regs *regs,
44					    int error, long val)
45{
46	if (error)
47		regs->r3 = -error;
48	else
49		regs->r3 = val;
50}
51
52static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
53							  unsigned int n)
54{
55	switch (n) {
56	case 5: return regs->r10;
57	case 4: return regs->r9;
58	case 3: return regs->r8;
59	case 2: return regs->r7;
60	case 1: return regs->r6;
61	case 0: return regs->r5;
62	default:
63		BUG();
64	}
65	return ~0;
66}
67
68static inline void syscall_get_arguments(struct task_struct *task,
69					 struct pt_regs *regs,
70					 unsigned long *args)
71{
72	unsigned int i = 0;
73	unsigned int n = 6;
74
75	while (n--)
76		*args++ = microblaze_get_syscall_arg(regs, i++);
77}
78
79asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
80asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
81
82static inline int syscall_get_arch(struct task_struct *task)
83{
84	return AUDIT_ARCH_MICROBLAZE;
85}
86#endif /* __ASM_MICROBLAZE_SYSCALL_H */