/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_MICROBLAZE_SYSCALL_H
#define __ASM_MICROBLAZE_SYSCALL_H

#include <uapi/linux/audit.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/ptrace.h>

/* The system call number is given by the user in R12 */
static inline long syscall_get_nr(struct task_struct *task,
                                  struct pt_regs *regs)
{
        return regs->r12;
}

static inline void syscall_set_nr(struct task_struct *task,
                                  struct pt_regs *regs,
                                  int nr)
{
        regs->r12 = nr;
}

static inline void syscall_rollback(struct task_struct *task,
                                    struct pt_regs *regs)
{
        /* TODO.  */
}

static inline long syscall_get_error(struct task_struct *task,
                                     struct pt_regs *regs)
{
        return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
                                            struct pt_regs *regs)
{
        return regs->r3;
}

static inline void syscall_set_return_value(struct task_struct *task,
                                            struct pt_regs *regs,
                                            int error, long val)
{
        if (error)
                regs->r3 = -error;
        else
                regs->r3 = val;
}

static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
                                                          unsigned int n)
{
        switch (n) {
        case 5: return regs->r10;
        case 4: return regs->r9;
        case 3: return regs->r8;
        case 2: return regs->r7;
        case 1: return regs->r6;
        case 0: return regs->r5;
        default:
                BUG();
        }
        return ~0;
}

static inline void syscall_get_arguments(struct task_struct *task,
                                         struct pt_regs *regs,
                                         unsigned long *args)
{
        unsigned int i = 0;
        unsigned int n = 6;

        while (n--)
                *args++ = microblaze_get_syscall_arg(regs, i++);
}

asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs);
asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);

static inline int syscall_get_arch(struct task_struct *task)
{
        return AUDIT_ARCH_MICROBLAZE;
}
#endif /* __ASM_MICROBLAZE_SYSCALL_H */