usr/src/sys/sparc/include/reloc.h

/*
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Lawrence Berkeley Laboratory.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)reloc.h     7.3 (Berkeley) %G%
 *
 * from: $Header: reloc.h,v 1.7 92/11/26 02:04:45 torek Exp $
 */

/*
 * SPARC relocations.  The linker has, unfortunately, a large number
 * of link types.  We do not do dynamic linking (yet?) but we define
 * the dynamic link types.
 */
enum reloc_type {
                /* architecturally-required types */
        RELOC_8,                /*  8-bit absolute */
        RELOC_16,               /* 16-bit absolute */
        RELOC_32,               /* 32-bit absolute */
        RELOC_DISP8,            /*  8-bit pc-relative */
        RELOC_DISP16,           /* 16-bit pc-relative */
        RELOC_DISP32,           /* 32-bit pc-relative */
        RELOC_WDISP30,          /* 30-bit pc-relative signed word */
        RELOC_WDISP22,          /* 22-bit pc-relative signed word */
        RELOC_HI22,             /* 22-bit `%hi' (ie, sethi %hi(X),%l0) */
        RELOC_22,               /* 22-bit non-%hi (i.e., sethi X,%l0) */
        RELOC_13,               /* 13-bit absolute */
        RELOC_LO10,             /* 10-bit `%lo' */

                /* gnu ld understands some of these, but I do not */
        RELOC_SFA_BASE,         /* ? */
        RELOC_SFA_OFF13,        /* ? */
        RELOC_BASE10,           /* ? */
        RELOC_BASE13,           /* ? */
        RELOC_BASE22,           /* ? */

                /* gnu ld does not use these but Sun linker does */
                /* we define them anyway (note that they are included
                   in the freely-available gas sources!) */
        RELOC_PC10,             /* ? */
        RELOC_PC22,             /* ? */
        RELOC_JMP_TBL,          /* ? */
        RELOC_SEGOFF16,         /* ? */
        RELOC_GLOB_DAT,         /* ? */
        RELOC_JMP_SLOT,         /* ? */
        RELOC_RELATIVE,         /* ? */
};

/*
 * SPARC relocation info.
 *
 * Symbol-relative relocation is done by:
 *      1. locating the appropriate symbol
 *      2. if defined, adding (value + r_addend), subtracting pc if pc-rel,
 *         and then shifting down 2 or 10 or 13 if necessary.
 * The resulting value is then to be stuffed into the appropriate bits
 * in the object (the low 22, or the high 30, or ..., etc).
 */
struct reloc_info_sparc {
        u_long  r_address;      /* relocation addr (offset in segment) */
        u_int   r_index:24,     /* segment (r_extern==0) or symbol index */
                r_extern:1,     /* if set, r_index is symbol index */
                :2;             /* unused */
        enum reloc_type r_type:5; /* relocation type, from above */
        long    r_addend;       /* value to add to symbol value */
};