/*      $OpenBSD: elf_aux_info.c,v 1.2 2026/05/09 19:39:14 naddy Exp $  */

/*
 * Copyright (c) 2024 Jeremie Courreges-Anglas <jca@wxcvbn.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/auxv.h>

#include <errno.h>
#include <unistd.h>

int
elf_aux_info(int request, void *buf, int buflen)
{
        int ret = 0;

        if (buflen < 0)
                return EINVAL;

        switch (request) {
        case AT_HWCAP:
                if (buflen != sizeof(unsigned long))
                        ret = EINVAL;
                else if (!_hwcap_avail)
                        ret = ENOENT;
                else
                        *(unsigned long *)buf = _hwcap;
                break;
        case AT_HWCAP2:
                if (buflen != sizeof(unsigned long))
                        ret = EINVAL;
                else if (!_hwcap2_avail)
                        ret = ENOENT;
                else
                        *(unsigned long *)buf = _hwcap2;
                break;
        case AT_PAGESZ:
                if (buflen != sizeof(int))
                        ret = EINVAL;
                else if (!_pagesize)
                        ret = ENOENT;
                else
                        *(int *)buf = _pagesize;
                break;
        default:
                if (request < 0 || request >= AT_COUNT)
                        ret = EINVAL;
                else
                        ret = ENOENT;
                break;
        }

        return ret;
}