kernel tree reorganization stage 1: Major cvs repository work (not logged as
[dragonfly.git] / sys / i386 / i386 / elf_machdep.c
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1/*-
2 * Copyright 1996-1998 John D. Polstra.
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: src/sys/i386/i386/elf_machdep.c,v 1.8 1999/12/21 11:14:02 eivind Exp $
d1786c1b 26 * $DragonFly: src/sys/i386/i386/Attic/elf_machdep.c,v 1.3 2003/07/18 05:12:37 dillon Exp $
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27 */
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/linker.h>
32#include <machine/elf.h>
33
34/* Process one elf relocation with addend. */
35int
36elf_reloc(linker_file_t lf, const void *data, int type, const char *sym)
37{
38 Elf_Addr relocbase = (Elf_Addr) lf->address;
39 Elf_Addr *where;
40 Elf_Addr addr;
41 Elf_Addr addend;
42 Elf_Word rtype;
d1786c1b 43 caddr_t caddr;
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44 const Elf_Rel *rel;
45 const Elf_Rela *rela;
46
47 switch (type) {
48 case ELF_RELOC_REL:
49 rel = (const Elf_Rel *)data;
50 where = (Elf_Addr *) (relocbase + rel->r_offset);
51 addend = *where;
52 rtype = ELF_R_TYPE(rel->r_info);
53 break;
54 case ELF_RELOC_RELA:
55 rela = (const Elf_Rela *)data;
56 where = (Elf_Addr *) (relocbase + rela->r_offset);
57 addend = rela->r_addend;
58 rtype = ELF_R_TYPE(rela->r_info);
59 break;
60 default:
61 panic("unknown reloc type %d\n", type);
62 }
63
64 switch (rtype) {
65
66 case R_386_NONE: /* none */
67 break;
68
69 case R_386_32: /* S + A */
70 if (sym == NULL)
71 return -1;
d1786c1b 72 if (linker_file_lookup_symbol(lf, sym, 1, &caddr) != 0)
984263bc 73 return -1;
d1786c1b 74 addr = (Elf_Addr)caddr;
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75 addr += addend;
76 if (*where != addr)
77 *where = addr;
78 break;
79
80 case R_386_PC32: /* S + A - P */
81 if (sym == NULL)
82 return -1;
d1786c1b 83 if (linker_file_lookup_symbol(lf, sym, 1, &caddr) != 0)
984263bc 84 return -1;
d1786c1b 85 addr = (Elf_Addr)caddr;
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86 addr += addend - (Elf_Addr)where;
87 if (*where != addr)
88 *where = addr;
89 break;
90
91 case R_386_COPY: /* none */
92 /*
93 * There shouldn't be copy relocations in kernel
94 * objects.
95 */
96 printf("kldload: unexpected R_COPY relocation\n");
97 return -1;
98 break;
99
100 case R_386_GLOB_DAT: /* S */
101 if (sym == NULL)
102 return -1;
d1786c1b 103 if (linker_file_lookup_symbol(lf, sym, 1, &caddr) != 0)
984263bc 104 return -1;
d1786c1b 105 addr = (Elf_Addr)caddr;
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106 if (*where != addr)
107 *where = addr;
108 break;
109
110 case R_386_RELATIVE: /* B + A */
111 addr = relocbase + addend;
112 if (*where != addr)
113 *where = addr;
114 break;
115
116 default:
117 printf("kldload: unexpected relocation type %d\n",
118 rtype);
119 return -1;
120 }
121 return(0);
122}