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/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright Altera Corporation (C) <2014>. All rights reserved
 */

#ifndef __ASM_NIOS2_SYSCALL_H__
#define __ASM_NIOS2_SYSCALL_H__

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

static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{
	return regs->r2;
}

static inline void syscall_rollback(struct task_struct *task,
				struct pt_regs *regs)
{
	regs->r2 = regs->orig_r2;
	regs->r7 = regs->orig_r7;
}

static inline long syscall_get_error(struct task_struct *task,
				struct pt_regs *regs)
{
	return regs->r7 ? regs->r2 : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
	struct pt_regs *regs)
{
	return regs->r2;
}

static inline void syscall_set_return_value(struct task_struct *task,
	struct pt_regs *regs, int error, long val)
{
	if (error) {
		/* error < 0, but nios2 uses > 0 return value */
		regs->r2 = -error;
		regs->r7 = 1;
	} else {
		regs->r2 = val;
		regs->r7 = 0;
	}
}

static inline void syscall_get_arguments(struct task_struct *task,
	struct pt_regs *regs, unsigned long *args)
{
	*args++ = regs->r4;
	*args++ = regs->r5;
	*args++ = regs->r6;
	*args++ = regs->r7;
	*args++ = regs->r8;
	*args   = regs->r9;
}

static inline void syscall_set_arguments(struct task_struct *task,
	struct pt_regs *regs, const unsigned long *args)
{
	regs->r4 = *args++;
	regs->r5 = *args++;
	regs->r6 = *args++;
	regs->r7 = *args++;
	regs->r8 = *args++;
	regs->r9 = *args;
}

static inline int syscall_get_arch(struct task_struct *task)
{
	return AUDIT_ARCH_NIOS2;
}

#endif