Home | History | Annotate | Line # | Download | only in include
reloc.h revision 1.1 
      1 /*-
      2  * Copyright (c) 1992 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  * from: @(#)reloc.h	7.2 (Berkeley) 2/4/93
     34  * from: Header: reloc.h,v 1.6 92/06/20 09:59:37 torek Exp
     35  * $Id: reloc.h,v 1.1 1993/10/12 03:22:40 deraadt Exp $
     36  */
     37 
     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