// SPDX-License-Identifier: GPL-2.0-or-later

#include <linux/regset.h>

#include <asm/switch_to.h>

#include "ptrace-decl.h"

/*
 * For get_evrregs/set_evrregs functions 'data' has the following layout:
 *
 * struct {
 *   u32 evr[32];
 *   u64 acc;
 *   u32 spefscr;
 * }
 */

int evr_active(struct task_struct *target, const struct user_regset *regset)
{
        flush_spe_to_thread(target);
        return target->thread.used_spe ? regset->n : 0;
}

int evr_get(struct task_struct *target, const struct user_regset *regset,
            struct membuf to)
{
        flush_spe_to_thread(target);

        membuf_write(&to, &target->thread.evr, sizeof(target->thread.evr));

        BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
                     offsetof(struct thread_struct, spefscr));

        return membuf_write(&to, &target->thread.acc,
                                sizeof(u64) + sizeof(u32));
}

int evr_set(struct task_struct *target, const struct user_regset *regset,
            unsigned int pos, unsigned int count,
            const void *kbuf, const void __user *ubuf)
{
        int ret;

        flush_spe_to_thread(target);

        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 &target->thread.evr,
                                 0, sizeof(target->thread.evr));

        BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
                     offsetof(struct thread_struct, spefscr));

        if (!ret)
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                         &target->thread.acc,
                                         sizeof(target->thread.evr), -1);

        return ret;
}