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 <uapi/linux/audit.h>
  17 #include <linux/sched.h>
  18 #include <linux/err.h>
  19
  20 static inline long syscall_get_nr(struct task_struct *task,
  21                                   struct pt_regs *regs)
  22 {
  23         if ((long)regs->cr_ifs < 0) /* Not a syscall */
  24                 return -1;
  25
  26         return regs->r15;
  27 }
  28
  29 static inline void syscall_rollback(struct task_struct *task,
  30                                     struct pt_regs *regs)
  31 {
  32         /* do nothing */
  33 }
  34
  35 static inline long syscall_get_error(struct task_struct *task,
  36                                      struct pt_regs *regs)
  37 {
  38         return regs->r10 == -1 ? regs->r8:0;
  39 }
  40
  41 static inline long syscall_get_return_value(struct task_struct *task,
  42                                             struct pt_regs *regs)
  43 {
  44         return regs->r8;
  45 }
  46
  47 static inline void syscall_set_return_value(struct task_struct *task,
  48                                             struct pt_regs *regs,
  49                                             int error, long val)
  50 {
  51         if (error) {
  52                 /* error < 0, but ia64 uses > 0 return value */
  53                 regs->r8 = -error;
  54                 regs->r10 = -1;
  55         } else {
  56                 regs->r8 = val;
  57                 regs->r10 = 0;
  58         }
  59 }
  60
  61 extern void ia64_syscall_get_set_arguments(struct task_struct *task,
  62         struct pt_regs *regs, unsigned int i, unsigned int n,
  63         unsigned long *args, int rw);
  64 static inline void syscall_get_arguments(struct task_struct *task,
  65                                          struct pt_regs *regs,
  66                                          unsigned int i, unsigned int n,
  67                                          unsigned long *args)
  68 {
  69         BUG_ON(i + n > 6);
  70
  71         ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
  72 }
  73
  74 static inline void syscall_set_arguments(struct task_struct *task,
  75                                          struct pt_regs *regs,
  76                                          unsigned int i, unsigned int n,
  77                                          unsigned long *args)
  78 {
  79         BUG_ON(i + n > 6);
  80
  81         ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
  82 }
  83
  84 static inline int syscall_get_arch(void)
  85 {
  86         return AUDIT_ARCH_IA64;
  87 }
  88 #endif  /* _ASM_SYSCALL_H */