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reloc.h revision 1.2 
      1 /*-
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  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	8.1 (Berkeley) 6/10/93
     34  *      $Id: reloc.h,v 1.2 1994/05/27 08:41:09 glass Exp $
     35  *
     36  * from: Header: reloc.h,v 1.6 92/06/20 09:59:37 torek Exp
     37  */
     38 
     39 /*
     40  * MIPS relocation types.
     41  */
     42 enum reloc_type {
     43 	MIPS_RELOC_32,		/* 32-bit absolute */
     44 	MIPS_RELOC_JMP,		/* 26-bit absolute << 2 | high 4 bits of pc */
     45 	MIPS_RELOC_WDISP16,	/* 16-bit signed pc-relative << 2 */
     46 	MIPS_RELOC_HI16,	/* 16-bit absolute << 16 */
     47 	MIPS_RELOC_HI16_S,	/* 16-bit absolute << 16 (+1 if needed) */
     48 	MIPS_RELOC_LO16,	/* 16-bit absolute */
     49 };
     50 
     51 /*
     52  * MIPS relocation info.
     53  *
     54  * Symbol-relative relocation is done by:
     55  *	1. start with the value r_addend,
     56  *	2. locate the appropriate symbol and if defined, add symbol value,
     57  *	3. if pc relative, subtract pc,
     58  *	4. if the reloc_type is MIPS_RELOC_HI16_S and the result bit 15 is set,
     59  *		add 0x00010000,
     60  *	5. shift down 2 or 16 if necessary.
     61  * The resulting value is then to be stuffed into the appropriate bits
     62  * in the object (the low 16, or the low 26 bits).
     63  */
     64 struct reloc_info_mips {
     65 	u_long	r_address;	/* relocation addr (offset in segment) */
     66 	u_int	r_index:24,	/* segment (r_extern==0) or symbol index */
     67 		r_extern:1,	/* if set, r_index is symbol index */
     68 		:2;		/* unused */
     69 	enum reloc_type r_type:5; /* relocation type, from above */
     70 	long	r_addend;	/* value to add to symbol value */
     71 };
     72