arch/ia64/include/asm/syscall.h

   1 /*
   2  * Access to user system call parameters and results
   3  *
   4  * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
   5  *
   6  * This copyrighted material is made available to anyone wishing to use,
   7  * modify, copy, or redistribute it subject to the terms and conditions
   8  * of the GNU General Public License v.2.
   9  *
  10  * See asm-generic/syscall.h for descriptions of what we must do here.
  11  */
  12
  13 #ifndef _ASM_SYSCALL_H
  14 #define _ASM_SYSCALL_H  1
  15
  16 #include <linux/sched.h>
  17 #include <linux/err.h>
  18
  19 static inline long syscall_get_nr(struct task_struct *task,
  20                                   struct pt_regs *regs)
  21 {
  22         if ((long)regs->cr_ifs < 0) /* Not a syscall */
  23                 return -1;
  24
  25         return regs->r15;
  26 }
  27
  28 static inline void syscall_rollback(struct task_struct *task,
  29                                     struct pt_regs *regs)
  30 {
  31         /* do nothing */
  32 }
  33
  34 static inline long syscall_get_error(struct task_struct *task,
  35                                      struct pt_regs *regs)
  36 {
  37         return regs->r10 == -1 ? regs->r8:0;
  38 }
  39
  40 static inline long syscall_get_return_value(struct task_struct *task,
  41                                             struct pt_regs *regs)
  42 {
  43         return regs->r8;
  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         if (error) {
  51                 /* error < 0, but ia64 uses > 0 return value */
  52                 regs->r8 = -error;
  53                 regs->r10 = -1;
  54         } else {
  55                 regs->r8 = val;
  56                 regs->r10 = 0;
  57         }
  58 }
  59
  60 extern void ia64_syscall_get_set_arguments(struct task_struct *task,
  61         struct pt_regs *regs, unsigned int i, unsigned int n,
  62         unsigned long *args, int rw);
  63 static inline void syscall_get_arguments(struct task_struct *task,
  64                                          struct pt_regs *regs,
  65                                          unsigned int i, unsigned int n,
  66                                          unsigned long *args)
  67 {
  68         BUG_ON(i + n > 6);
  69
  70         ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
  71 }
  72
  73 static inline void syscall_set_arguments(struct task_struct *task,
  74                                          struct pt_regs *regs,
  75                                          unsigned int i, unsigned int n,
  76                                          unsigned long *args)
  77 {
  78         BUG_ON(i + n > 6);
  79
  80         ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
  81 }
  82 #endif  /* _ASM_SYSCALL_H */