/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Access to user system call parameters and results
 *
 * See asm-generic/syscall.h for function descriptions.
 *
 * Copyright (C) 2015 Mickaël Salaün <mic@digikod.net>
 */

#ifndef __UM_SYSCALL_GENERIC_H
#define __UM_SYSCALL_GENERIC_H

#include <asm/ptrace.h>
#include <linux/err.h>
#include <linux/sched.h>
#include <sysdep/ptrace.h>

static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{

        return PT_REGS_SYSCALL_NR(regs);
}

static inline void syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
{
        PT_REGS_SYSCALL_NR(regs) = nr;
}

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)
{
        const long error = regs_return_value(regs);

        return IS_ERR_VALUE(error) ? error : 0;
}

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

static inline void syscall_set_return_value(struct task_struct *task,
                                            struct pt_regs *regs,
                                            int error, long val)
{
        PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
}

static inline void syscall_get_arguments(struct task_struct *task,
                                         struct pt_regs *regs,
                                         unsigned long *args)
{
        const struct uml_pt_regs *r = &regs->regs;

        *args++ = UPT_SYSCALL_ARG1(r);
        *args++ = UPT_SYSCALL_ARG2(r);
        *args++ = UPT_SYSCALL_ARG3(r);
        *args++ = UPT_SYSCALL_ARG4(r);
        *args++ = UPT_SYSCALL_ARG5(r);
        *args   = UPT_SYSCALL_ARG6(r);
}

static inline void syscall_set_arguments(struct task_struct *task,
                                         struct pt_regs *regs,
                                         const unsigned long *args)
{
        struct uml_pt_regs *r = &regs->regs;

        UPT_SYSCALL_ARG1(r) = *args++;
        UPT_SYSCALL_ARG2(r) = *args++;
        UPT_SYSCALL_ARG3(r) = *args++;
        UPT_SYSCALL_ARG4(r) = *args++;
        UPT_SYSCALL_ARG5(r) = *args++;
        UPT_SYSCALL_ARG6(r) = *args;
}

/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */

#endif  /* __UM_SYSCALL_GENERIC_H */