sys/arch/mips/include/reloc.h

   1 /*      $NetBSD: reloc.h,v 1.7.28.3 2004/09/21 13:18:39 skrll Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)reloc.h     8.1 (Berkeley) 6/10/93
  32  *
  33  * from: Header: reloc.h,v 1.6 92/06/20 09:59:37 torek Exp
  34  */
  35
  36 #ifndef __MIPS_RELOC_H__
  37 #define __MIPS_RELOC_H__
  38 /*
  39  * MIPS relocation types.
  40  */
  41 enum reloc_type {
  42         MIPS_RELOC_32,          /* 32-bit absolute */
  43         MIPS_RELOC_JMP,         /* 26-bit absolute << 2 | high 4 bits of pc */
  44         MIPS_RELOC_WDISP16,     /* 16-bit signed pc-relative << 2 */
  45         MIPS_RELOC_HI16,        /* 16-bit absolute << 16 */
  46         MIPS_RELOC_HI16_S,      /* 16-bit absolute << 16 (+1 if needed) */
  47         MIPS_RELOC_LO16         /* 16-bit absolute */
  48 };
  49
  50 /*
  51  * MIPS relocation info.
  52  *
  53  * Symbol-relative relocation is done by:
  54  *      1. start with the value r_addend,
  55  *      2. locate the appropriate symbol and if defined, add symbol value,
  56  *      3. if pc relative, subtract pc,
  57  *      4. if the reloc_type is MIPS_RELOC_HI16_S and the result bit 15 is set,
  58  *              add 0x00010000,
  59  *      5. shift down 2 or 16 if necessary.
  60  * The resulting value is then to be stuffed into the appropriate bits
  61  * in the object (the low 16, or the low 26 bits).
  62  */
  63 struct reloc_info_mips {
  64         u_long  r_address;      /* relocation addr (offset in segment) */
  65         u_int   r_index:24,     /* segment (r_extern==0) or symbol index */
  66                 r_extern:1,     /* if set, r_index is symbol index */
  67                 :2;             /* unused */
  68         enum reloc_type r_type:5; /* relocation type, from above */
  69         long    r_addend;       /* value to add to symbol value */
  70 };
  71
  72 #define relocation_info reloc_info_mips
  73 #endif /* __MIPS_RELOC_H__ */