1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)reloc.h 8.1 (Berkeley) 06/10/93 8 * 9 * from: $Header: reloc.h,v 1.6 92/06/20 09:59:37 torek Exp $ 10 */ 11 12 /* 13 * MIPS relocation types. 14 */ 15 enum reloc_type { 16 MIPS_RELOC_32, /* 32-bit absolute */ 17 MIPS_RELOC_JMP, /* 26-bit absolute << 2 | high 4 bits of pc */ 18 MIPS_RELOC_WDISP16, /* 16-bit signed pc-relative << 2 */ 19 MIPS_RELOC_HI16, /* 16-bit absolute << 16 */ 20 MIPS_RELOC_HI16_S, /* 16-bit absolute << 16 (+1 if needed) */ 21 MIPS_RELOC_LO16, /* 16-bit absolute */ 22 }; 23 24 /* 25 * MIPS relocation info. 26 * 27 * Symbol-relative relocation is done by: 28 * 1. start with the value r_addend, 29 * 2. locate the appropriate symbol and if defined, add symbol value, 30 * 3. if pc relative, subtract pc, 31 * 4. if the reloc_type is MIPS_RELOC_HI16_S and the result bit 15 is set, 32 * add 0x00010000, 33 * 5. shift down 2 or 16 if necessary. 34 * The resulting value is then to be stuffed into the appropriate bits 35 * in the object (the low 16, or the low 26 bits). 36 */ 37 struct reloc_info_mips { 38 u_long r_address; /* relocation addr (offset in segment) */ 39 u_int r_index:24, /* segment (r_extern==0) or symbol index */ 40 r_extern:1, /* if set, r_index is symbol index */ 41 :2; /* unused */ 42 enum reloc_type r_type:5; /* relocation type, from above */ 43 long r_addend; /* value to add to symbol value */ 44 }; 45