arch/mn10300/include/asm/syscall.h

   1 /* Access to user system call parameters and results
   2  *
   3  * See asm-generic/syscall.h for function descriptions.
   4  *
   5  * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
   6  * Written by David Howells (dhowells@redhat.com)
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public Licence
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the Licence, or (at your option) any later version.
  12  */
  13
  14 #ifndef _ASM_SYSCALL_H
  15 #define _ASM_SYSCALL_H
  16
  17 #include <linux/sched.h>
  18 #include <linux/err.h>
  19
  20 extern const unsigned long sys_call_table[];
  21
  22 static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
  23 {
  24         return regs->orig_d0;
  25 }
  26
  27 static inline void syscall_rollback(struct task_struct *task,
  28                                     struct pt_regs *regs)
  29 {
  30         regs->d0 = regs->orig_d0;
  31 }
  32
  33 static inline long syscall_get_error(struct task_struct *task,
  34                                      struct pt_regs *regs)
  35 {
  36         unsigned long error = regs->d0;
  37         return IS_ERR_VALUE(error) ? error : 0;
  38 }
  39
  40 static inline long syscall_get_return_value(struct task_struct *task,
  41                                             struct pt_regs *regs)
  42 {
  43         return regs->d0;
  44 }
  45
  46 static inline void syscall_set_return_value(struct task_struct *task,
  47                                             struct pt_regs *regs,
  48                                             int error, long val)
  49 {
  50         regs->d0 = (long) error ?: val;
  51 }
  52
  53 static inline void syscall_get_arguments(struct task_struct *task,
  54                                          struct pt_regs *regs,
  55                                          unsigned int i, unsigned int n,
  56                                          unsigned long *args)
  57 {
  58         switch (i) {
  59         case 0:
  60                 if (!n--) break;
  61                 *args++ = regs->a0;
  62         case 1:
  63                 if (!n--) break;
  64                 *args++ = regs->d1;
  65         case 2:
  66                 if (!n--) break;
  67                 *args++ = regs->a3;
  68         case 3:
  69                 if (!n--) break;
  70                 *args++ = regs->a2;
  71         case 4:
  72                 if (!n--) break;
  73                 *args++ = regs->d3;
  74         case 5:
  75                 if (!n--) break;
  76                 *args++ = regs->d2;
  77         case 6:
  78                 if (!n--) break;
  79         default:
  80                 BUG();
  81                 break;
  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--) break;
  93                 regs->a0 = *args++;
  94         case 1:
  95                 if (!n--) break;
  96                 regs->d1 = *args++;
  97         case 2:
  98                 if (!n--) break;
  99                 regs->a3 = *args++;
 100         case 3:
 101                 if (!n--) break;
 102                 regs->a2 = *args++;
 103         case 4:
 104                 if (!n--) break;
 105                 regs->d3 = *args++;
 106         case 5:
 107                 if (!n--) break;
 108                 regs->d2 = *args++;
 109         case 6:
 110                 if (!n--) break;
 111         default:
 112                 BUG();
 113                 break;
 114         }
 115 }
 116
 117 #endif /* _ASM_SYSCALL_H */