syscall.h

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/*
 * 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 */