/*
* Access to user system call parameters and results
*
* Copyright (C) 2008 Intel Corp. Shaohua Li <[email protected]>
*
* 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;

return regs->r15;
}

static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
/* do nothing */
}

static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
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)
{
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);

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);

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