LXR linux/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
  20extern const unsigned long sys_call_table[];
  21
  22static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
  23{
  24        return regs->orig_d0;
  25}
  26
  27static inline void syscall_rollback(struct task_struct *task,
  28                                    struct pt_regs *regs)
  29{
  30        regs->d0 = regs->orig_d0;
  31}
  32
  33static 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
  40static inline long syscall_get_return_value(struct task_struct *task,
  41                                            struct pt_regs *regs)
  42{
  43        return regs->d0;
  44}
  45
  46static 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
  53static 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
  85static 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 */
 118