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reloc.h revision 1.4 
      1 /*	$NetBSD: reloc.h,v 1.4 1994/10/26 21:09:59 cgd 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)reloc.h	8.1 (Berkeley) 6/10/93
     36  *
     37  * from: Header: reloc.h,v 1.6 92/06/20 09:59:37 torek Exp
     38  */
     39 
     40 /*
     41  * MIPS relocation types.
     42  */
     43 enum reloc_type {
     44 	MIPS_RELOC_32,		/* 32-bit absolute */
     45 	MIPS_RELOC_JMP,		/* 26-bit absolute << 2 | high 4 bits of pc */
     46 	MIPS_RELOC_WDISP16,	/* 16-bit signed pc-relative << 2 */
     47 	MIPS_RELOC_HI16,	/* 16-bit absolute << 16 */
     48 	MIPS_RELOC_HI16_S,	/* 16-bit absolute << 16 (+1 if needed) */
     49 	MIPS_RELOC_LO16,	/* 16-bit absolute */
     50 };
     51 
     52 /*
     53  * MIPS relocation info.
     54  *
     55  * Symbol-relative relocation is done by:
     56  *	1. start with the value r_addend,
     57  *	2. locate the appropriate symbol and if defined, add symbol value,
     58  *	3. if pc relative, subtract pc,
     59  *	4. if the reloc_type is MIPS_RELOC_HI16_S and the result bit 15 is set,
     60  *		add 0x00010000,
     61  *	5. shift down 2 or 16 if necessary.
     62  * The resulting value is then to be stuffed into the appropriate bits
     63  * in the object (the low 16, or the low 26 bits).
     64  */
     65 struct reloc_info_pmax {
     66 	u_long	r_address;	/* relocation addr (offset in segment) */
     67 	u_int	r_index:24,	/* segment (r_extern==0) or symbol index */
     68 		r_extern:1,	/* if set, r_index is symbol index */
     69 		:2;		/* unused */
     70 	enum reloc_type r_type:5; /* relocation type, from above */
     71 	long	r_addend;	/* value to add to symbol value */
     72 };
     73 
     74 #define relocation_info reloc_info_pmax
     75