arch/openrisc/include/asm/syscall.h

   1 /*
   2  * OpenRISC Linux
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * OpenRISC implementation:
   9  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11  * et al.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  */
  18
  19 #ifndef __ASM_OPENRISC_SYSCALL_H__
  20 #define __ASM_OPENRISC_SYSCALL_H__
  21
  22 #include <linux/err.h>
  23 #include <linux/sched.h>
  24
  25 static inline int
  26 syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
  27 {
  28         return regs->syscallno ? regs->syscallno : -1;
  29 }
  30
  31 static inline void
  32 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
  33 {
  34         regs->gpr[11] = regs->orig_gpr11;
  35 }
  36
  37 static inline long
  38 syscall_get_error(struct task_struct *task, struct pt_regs *regs)
  39 {
  40         return IS_ERR_VALUE(regs->gpr[11]) ? regs->gpr[11] : 0;
  41 }
  42
  43 static inline long
  44 syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
  45 {
  46         return regs->gpr[11];
  47 }
  48
  49 static inline void
  50 syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
  51                          int error, long val)
  52 {
  53         if (error)
  54                 regs->gpr[11] = -error;
  55         else
  56                 regs->gpr[11] = val;
  57 }
  58
  59 static inline void
  60 syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
  61                       unsigned int i, unsigned int n, unsigned long *args)
  62 {
  63         BUG_ON(i + n > 6);
  64
  65         memcpy(args, &regs->gpr[3 + i], n * sizeof(args[0]));
  66 }
  67
  68 static inline void
  69 syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
  70                       unsigned int i, unsigned int n, const unsigned long *args)
  71 {
  72         BUG_ON(i + n > 6);
  73
  74         memcpy(&regs->gpr[3 + i], args, n * sizeof(args[0]));
  75 }
  76
  77 #endif