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syscall.h

/*
 * Access to user system call parameters and results
 *
 * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 *
 * See asm-generic/syscall.h for descriptions of what we must do here.
 */

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H  1

#include <linux/sched.h>
#include <linux/err.h>

static inline long syscall_get_nr(struct task_struct *task,
                          struct pt_regs *regs)
{
      if ((long)regs->cr_ifs < 0) /* Not a syscall */
            return -1;

#ifdef CONFIG_IA32_SUPPORT
      if (IS_IA32_PROCESS(regs))
            return regs->r1;
#endif

      return regs->r15;
}

static inline void syscall_rollback(struct task_struct *task,
                            struct pt_regs *regs)
{
#ifdef CONFIG_IA32_SUPPORT
      if (IS_IA32_PROCESS(regs))
            regs->r8 = regs->r1;
#endif

      /* do nothing */
}

static inline long syscall_get_error(struct task_struct *task,
                             struct pt_regs *regs)
{
#ifdef CONFIG_IA32_SUPPORT
      if (IS_IA32_PROCESS(regs))
            return regs->r8;
#endif

      return regs->r10 == -1 ? regs->r8:0;
}

static inline long syscall_get_return_value(struct task_struct *task,
                                  struct pt_regs *regs)
{
      return regs->r8;
}

static inline void syscall_set_return_value(struct task_struct *task,
                                  struct pt_regs *regs,
                                  int error, long val)
{
#ifdef CONFIG_IA32_SUPPORT
      if (IS_IA32_PROCESS(regs)) {
            regs->r8 = (long) error ? error : val;
            return;
      }
#endif

      if (error) {
            /* error < 0, but ia64 uses > 0 return value */
            regs->r8 = -error;
            regs->r10 = -1;
      } else {
            regs->r8 = val;
            regs->r10 = 0;
      }
}

extern void ia64_syscall_get_set_arguments(struct task_struct *task,
      struct pt_regs *regs, unsigned int i, unsigned int n,
      unsigned long *args, int rw);
static inline void syscall_get_arguments(struct task_struct *task,
                               struct pt_regs *regs,
                               unsigned int i, unsigned int n,
                               unsigned long *args)
{
      BUG_ON(i + n > 6);

#ifdef CONFIG_IA32_SUPPORT
      if (IS_IA32_PROCESS(regs)) {
            switch (i + n) {
            case 6:
                  if (!n--) break;
                  *args++ = regs->r13;
            case 5:
                  if (!n--) break;
                  *args++ = regs->r15;
            case 4:
                  if (!n--) break;
                  *args++ = regs->r14;
            case 3:
                  if (!n--) break;
                  *args++ = regs->r10;
            case 2:
                  if (!n--) break;
                  *args++ = regs->r9;
            case 1:
                  if (!n--) break;
                  *args++ = regs->r11;
            case 0:
                  if (!n--) break;
            default:
                  BUG();
                  break;
            }

            return;
      }
#endif
      ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
}

static inline void syscall_set_arguments(struct task_struct *task,
                               struct pt_regs *regs,
                               unsigned int i, unsigned int n,
                               unsigned long *args)
{
      BUG_ON(i + n > 6);

#ifdef CONFIG_IA32_SUPPORT
      if (IS_IA32_PROCESS(regs)) {
            switch (i + n) {
            case 6:
                  if (!n--) break;
                  regs->r13 = *args++;
            case 5:
                  if (!n--) break;
                  regs->r15 = *args++;
            case 4:
                  if (!n--) break;
                  regs->r14 = *args++;
            case 3:
                  if (!n--) break;
                  regs->r10 = *args++;
            case 2:
                  if (!n--) break;
                  regs->r9 = *args++;
            case 1:
                  if (!n--) break;
                  regs->r11 = *args++;
            case 0:
                  if (!n--) break;
            }

            return;
      }
#endif
      ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
}
#endif      /* _ASM_SYSCALL_H */

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