/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright (c) 2015, Joyent, Inc.
 */

        .file   "byteorder.s"

#include "SYS.h"

        /*
         * NOTE: htonl/ntohl are identical routines, as are htons/ntohs.
         * As such, they could be implemented as a single routine, using
         * multiple ALTENTRY/SET_SIZE definitions. We don't do this so
         * that they will have unique addresses, allowing DTrace and
         * other debuggers to tell them apart.  With the endian
         * functions we do the same, even though it's similarly
         * repetitive.
         */

/       unsigned long htonl( hl )
/       unsigned long ntohl( hl )
/       long hl;
/       reverses the byte order of 'long hl'
/
        ENTRY(htonl)
        movl    4(%esp), %eax   / %eax = hl
        bswap   %eax            / reverses the byte order of %eax
        ret                     / return (%eax)
        SET_SIZE(htonl)

        ENTRY(ntohl)
        movl    4(%esp), %eax   / %eax = hl
        bswap   %eax            / reverses the byte order of %eax
        ret                     / return (%eax)
        SET_SIZE(ntohl)

/       unsigned short htons( hs )
/       short hs;
/
/       reverses the byte order in hs.
/
        ENTRY(htons)
        movl    4(%esp), %eax   / %eax = hs
        bswap   %eax            / reverses the byte order of %eax
        shrl    $16, %eax       / moves high 16-bit to low 16-bit
        ret                     / return (%eax)
        SET_SIZE(htons)

        ENTRY(ntohs)
        movl    4(%esp), %eax   / %eax = hs
        bswap   %eax            / reverses the byte order of %eax
        shrl    $16, %eax       / moves high 16-bit to low 16-bit
        ret                     / return (%eax)
        SET_SIZE(ntohs)

/       uint16_t htobe16(uint16_t in)
/
/       Convert in to big endian, eg. htons()
/
        ENTRY(htobe16)
        movl    4(%esp), %eax   / %eax = hs
        bswap   %eax            / reverses the byte order of %eax
        shrl    $16, %eax       / moves high 16-bit to low 16-bit
        ret                     / return (%eax)
        SET_SIZE(htobe16)

/       uint32_t htobe32(uint32_t in)
/
/       Convert in to big endian, eg. htonl()
/
        ENTRY(htobe32)
        movl    4(%esp), %eax   / %eax = hl
        bswap   %eax            / reverses the byte order of %eax
        ret                     / return (%eax)
        SET_SIZE(htobe32)

/       uint16_t betoh16(uint16_t in)
/       uint16_t be16toh(uint16_t in)
/
/       Convert in to little endian, eg. ntohs()
/
        ENTRY(betoh16)
        movl    4(%esp), %eax   / %eax = hs
        bswap   %eax            / reverses the byte order of %eax
        shrl    $16, %eax       / moves high 16-bit to low 16-bit
        ret                     / return (%eax)
        SET_SIZE(betoh16)

        ENTRY(be16toh)
        movl    4(%esp), %eax   / %eax = hs
        bswap   %eax            / reverses the byte order of %eax
        shrl    $16, %eax       / moves high 16-bit to low 16-bit
        ret                     / return (%eax)
        SET_SIZE(be16toh)


/       uint32_t be32toh(uint32_t in)
/       uint32_t betoh32(uint32_t in)
/
/       Convert in to little endian, eg. ntohl()
/
        ENTRY(be32toh)
        movl    4(%esp), %eax   / %eax = hl
        bswap   %eax            / reverses the byte order of %eax
        ret                     / return (%eax)
        SET_SIZE(be32toh)

        ENTRY(betoh32)
        movl    4(%esp), %eax   / %eax = hl
        bswap   %eax            / reverses the byte order of %eax
        ret                     / return (%eax)
        SET_SIZE(betoh32)