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 */
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)11 static inline long syscall_get_nr(struct task_struct *task,
12 struct pt_regs *regs)
13 {
14 return regs->r12;
15 }
16
syscall_set_nr(struct task_struct * task,struct pt_regs * regs,int nr)17 static inline void syscall_set_nr(struct task_struct *task,
18 struct pt_regs *regs,
19 int nr)
20 {
21 regs->r12 = nr;
22 }
23
syscall_rollback(struct task_struct * task,struct pt_regs * regs)24 static inline void syscall_rollback(struct task_struct *task,
25 struct pt_regs *regs)
26 {
27 /* TODO. */
28 }
29
syscall_get_error(struct task_struct * task,struct pt_regs * regs)30 static 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
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)36 static inline long syscall_get_return_value(struct task_struct *task,
37 struct pt_regs *regs)
38 {
39 return regs->r3;
40 }
41
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)42 static 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
microblaze_get_syscall_arg(struct pt_regs * regs,unsigned int n)52 static 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
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)68 static 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
79 asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
80 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
81
syscall_get_arch(struct task_struct * task)82 static inline int syscall_get_arch(struct task_struct *task)
83 {
84 return AUDIT_ARCH_MICROBLAZE;
85 }
86 #endif /* __ASM_MICROBLAZE_SYSCALL_H */
87