Linux Kernel  3.7.1
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syscall.h
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1 #ifndef __ASM_MICROBLAZE_SYSCALL_H
2 #define __ASM_MICROBLAZE_SYSCALL_H
3 
4 #include <linux/kernel.h>
5 #include <linux/sched.h>
6 #include <asm/ptrace.h>
7 
8 /* The system call number is given by the user in R12 */
9 static inline long syscall_get_nr(struct task_struct *task,
10  struct pt_regs *regs)
11 {
12  return regs->r12;
13 }
14 
15 static inline void syscall_rollback(struct task_struct *task,
16  struct pt_regs *regs)
17 {
18  /* TODO. */
19 }
20 
21 static inline long syscall_get_error(struct task_struct *task,
22  struct pt_regs *regs)
23 {
24  return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
25 }
26 
27 static inline long syscall_get_return_value(struct task_struct *task,
28  struct pt_regs *regs)
29 {
30  return regs->r3;
31 }
32 
33 static inline void syscall_set_return_value(struct task_struct *task,
34  struct pt_regs *regs,
35  int error, long val)
36 {
37  if (error)
38  regs->r3 = -error;
39  else
40  regs->r3 = val;
41 }
42 
43 static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
44  unsigned int n)
45 {
46  switch (n) {
47  case 5: return regs->r10;
48  case 4: return regs->r9;
49  case 3: return regs->r8;
50  case 2: return regs->r7;
51  case 1: return regs->r6;
52  case 0: return regs->r5;
53  default:
54  BUG();
55  }
56  return ~0;
57 }
58 
59 static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
60  unsigned int n,
61  unsigned long val)
62 {
63  switch (n) {
64  case 5:
65  regs->r10 = val;
66  case 4:
67  regs->r9 = val;
68  case 3:
69  regs->r8 = val;
70  case 2:
71  regs->r7 = val;
72  case 1:
73  regs->r6 = val;
74  case 0:
75  regs->r5 = val;
76  default:
77  BUG();
78  }
79 }
80 
81 static inline void syscall_get_arguments(struct task_struct *task,
82  struct pt_regs *regs,
83  unsigned int i, unsigned int n,
84  unsigned long *args)
85 {
86  while (n--)
87  *args++ = microblaze_get_syscall_arg(regs, i++);
88 }
89 
90 static inline void syscall_set_arguments(struct task_struct *task,
91  struct pt_regs *regs,
92  unsigned int i, unsigned int n,
93  const unsigned long *args)
94 {
95  while (n--)
96  microblaze_set_syscall_arg(regs, i++, *args++);
97 }
98 
99 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs);
100 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
101 
102 #endif /* __ASM_MICROBLAZE_SYSCALL_H */
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