LXR linux/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
  20static 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
  29static inline void syscall_rollback(struct task_struct *task,
  30                                    struct pt_regs *regs)
  31{
  32        /* do nothing */
  33}
  34
  35static 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
  41static inline long syscall_get_return_value(struct task_struct *task,
  42                                            struct pt_regs *regs)
  43{
  44        return regs->r8;
  45}
  46
  47static 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
  61extern 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);
  64static 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
  74static 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
  84static inline int syscall_get_arch(void)
  85{
  86        return AUDIT_ARCH_IA64;
  87}
  88#endif  /* _ASM_SYSCALL_H */
  89