release/src-rt-6.x.4708/linux/linux-2.6.36/arch/microblaze/include/asm/syscall.h

   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 #endif /* __ASM_MICROBLAZE_SYSCALL_H */