arch/c6x/include/asm/syscall.h

   1 /*
   2  * Copyright (C) 2011 Texas Instruments Incorporated
   3  * Author: Mark Salter <msalter@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #ifndef __ASM_C6X_SYSCALL_H
  12 #define __ASM_C6X_SYSCALL_H
  13
  14 #include <linux/err.h>
  15 #include <linux/sched.h>
  16
  17 static inline int syscall_get_nr(struct task_struct *task,
  18                                  struct pt_regs *regs)
  19 {
  20         return regs->b0;
  21 }
  22
  23 static inline void syscall_rollback(struct task_struct *task,
  24                                     struct pt_regs *regs)
  25 {
  26         /* do nothing */
  27 }
  28
  29 static inline long syscall_get_error(struct task_struct *task,
  30                                      struct pt_regs *regs)
  31 {
  32         return IS_ERR_VALUE(regs->a4) ? regs->a4 : 0;
  33 }
  34
  35 static inline long syscall_get_return_value(struct task_struct *task,
  36                                             struct pt_regs *regs)
  37 {
  38         return regs->a4;
  39 }
  40
  41 static inline void syscall_set_return_value(struct task_struct *task,
  42                                             struct pt_regs *regs,
  43                                             int error, long val)
  44 {
  45         regs->a4 = error ?: val;
  46 }
  47
  48 static inline void syscall_get_arguments(struct task_struct *task,
  49                                          struct pt_regs *regs, unsigned int i,
  50                                          unsigned int n, unsigned long *args)
  51 {
  52         switch (i) {
  53         case 0:
  54                 if (!n--)
  55                         break;
  56                 *args++ = regs->a4;
  57         case 1:
  58                 if (!n--)
  59                         break;
  60                 *args++ = regs->b4;
  61         case 2:
  62                 if (!n--)
  63                         break;
  64                 *args++ = regs->a6;
  65         case 3:
  66                 if (!n--)
  67                         break;
  68                 *args++ = regs->b6;
  69         case 4:
  70                 if (!n--)
  71                         break;
  72                 *args++ = regs->a8;
  73         case 5:
  74                 if (!n--)
  75                         break;
  76                 *args++ = regs->b8;
  77         case 6:
  78                 if (!n--)
  79                         break;
  80         default:
  81                 BUG();
  82         }
  83 }
  84
  85 static inline void syscall_set_arguments(struct task_struct *task,
  86                                          struct pt_regs *regs,
  87                                          unsigned int i, unsigned int n,
  88                                          const unsigned long *args)
  89 {
  90         switch (i) {
  91         case 0:
  92                 if (!n--)
  93                         break;
  94                 regs->a4 = *args++;
  95         case 1:
  96                 if (!n--)
  97                         break;
  98                 regs->b4 = *args++;
  99         case 2:
 100                 if (!n--)
 101                         break;
 102                 regs->a6 = *args++;
 103         case 3:
 104                 if (!n--)
 105                         break;
 106                 regs->b6 = *args++;
 107         case 4:
 108                 if (!n--)
 109                         break;
 110                 regs->a8 = *args++;
 111         case 5:
 112                 if (!n--)
 113                         break;
 114                 regs->a9 = *args++;
 115         case 6:
 116                 if (!n)
 117                         break;
 118         default:
 119                 BUG();
 120         }
 121 }
 122
 123 #endif /* __ASM_C6X_SYSCALLS_H */