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 */
11 static inline long syscall_get_nr(struct task_struct *task,
12 struct pt_regs *regs)
13 {
14 return regs->r12;
15 }
16
17 static inline void syscall_rollback(struct task_struct *task,
18 struct pt_regs *regs)
19 {
20 /* TODO. */
21 }
22
23 static 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
29 static inline long syscall_get_return_value(struct task_struct *task,
30 struct pt_regs *regs)
31 {
32 return regs->r3;
33 }
34
35 static 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
45 static 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
61 static 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
72 asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
73 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
74
75 static inline int syscall_get_arch(struct task_struct *task)
76 {
77 return AUDIT_ARCH_MICROBLAZE;
78 }
79 #endif /* __ASM_MICROBLAZE_SYSCALL_H */
80
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