/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.1 (the "License").  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Relocation types used in the I860 implementation.  Relocation entries for
 * things other than instructions use the same generic relocation as discribed
 * above and their r_type is RELOC_VANILLA.  The rest of the relocation types
 * are for instructions.  Since they are for instructions the r_address field
 * indicates the 32 bit instruction that the relocation is to be preformed on.
 * The fields r_pcrel and r_length are ignored for non-RELOC_VANILLA r_types
 * except RELOC_SPLIT0 as discribed below.
 */
enum reloc_type_i860
{
    I860_RELOC_VANILLA, /* generic relocation as discribed above */

    I860_RELOC_PAIR,    /* Only follows a I860_RELOC_HIGH or a
                         * I860_RELOC_HIGHADJ and only the r_address has any
                         * meaning.
                         */ 
    I860_RELOC_HIGH,    /* The low 16 bits of the instruction contains the high
                         * 16 bits of the item being refered to.  This
                         * relocation type must be followed by a I860_RELOC_PAIR
                         * relocation type.  The low 16 bits of the item being
                         * refered to is stored in the r_address of the
                         * I860_RELOC_PAIR entry.
                         */
    I860_RELOC_LOW0,    /* For all of these the low 16 bits of the instruction*/
    I860_RELOC_LOW1,    /* (minus the low 0, 1, 2, 3, or 4 bits) contain the  */
    I860_RELOC_LOW2,    /* low 16 bits of the item being refered to.  The bits*/
    I860_RELOC_LOW3,    /* of the reference that are missing are 0 and the    */
    I860_RELOC_LOW4,    /* bits in the instruction are part of the encoding of*/
                        /* instruction.  The resulting low 16 bits of the item*/
                        /* being refered to is sign extended to 32 bits.      */

    I860_RELOC_SPLIT0,  /* For all of these the bits 20-14 and bits 10-0 of   */
    I860_RELOC_SPLIT1,  /* the instruction (minus the low 0, 1 or 2 bits)     */
    I860_RELOC_SPLIT2,  /* contain the low 16 bits of the item to being       */
                        /* refered to.  The bits of the reference that are    */
                        /* missing are 0 and the bits of the instruction are  */
                        /* part of the encoding of the instruction.  The      */
                        /* resulting low 16 bits of the item being relocated  */
                        /* is sign extened to 32 bits.  A special case of the */
                        /* I860_RELOC_SPLIT0 is when r_pcrel is non-zero (for */
                        /* branch displacements).  In this case the 16 bits   */
                        /* from the instruction is a 32 bit word displacement.*/

    I860_RELOC_HIGHADJ, /* Same as the RELOC_HIGH except the low 16 bits and the
                         * high 16 bits are added together with the low 16 bits
                         * sign extened first.  This means if bit 15 of the low
                         * 16 bits is set the high 16 bits stored in the
                         * instruction will be adjusted.
                         */
    I860_RELOC_BRADDR,  /* The low 26 bits of the instruction is a 32 bit
                         * word displacement from the pc to the item to being
                         * refered to.
                         */
    I860_RELOC_SECTDIFF /* a PAIR follows with subtract symbol value */
};
