2 * Copyright 1996-1998 John D. Polstra.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
25 * $FreeBSD: src/sys/i386/i386/elf_machdep.c,v 1.8 1999/12/21 11:14:02 eivind Exp $
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/linker.h>
31 #include <machine/elf.h>
33 /* Process one elf relocation with addend. */
35 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
36 int type, int local, elf_lookup_fn lookup)
38 Elf64_Addr *where, val;
39 Elf32_Addr *where32, val32;
42 Elf_Size rtype, symidx;
48 rel = (const Elf_Rel *)data;
49 where = (Elf_Addr *) (relocbase + rel->r_offset);
50 rtype = ELF_R_TYPE(rel->r_info);
51 symidx = ELF_R_SYM(rel->r_info);
52 /* Addend is 32 bit on 32 bit relocs */
57 addend = *(Elf32_Addr *)where;
65 rela = (const Elf_Rela *)data;
66 where = (Elf_Addr *) (relocbase + rela->r_offset);
67 addend = rela->r_addend;
68 rtype = ELF_R_TYPE(rela->r_info);
69 symidx = ELF_R_SYM(rela->r_info);
72 panic("unknown reloc type %d\n", type);
77 case R_X86_64_NONE: /* none */
80 case R_X86_64_64: /* S + A */
81 if (lookup(lf, symidx, 1, &addr))
88 case R_X86_64_PC32: /* S + A - P */
89 if (lookup(lf, symidx, 1, &addr))
91 where32 = (Elf32_Addr *)where;
92 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
93 if (*where32 != val32)
97 case R_X86_64_32: /* S + A zero extend */
98 case R_X86_64_32S: /* S + A sign extend */
99 if (lookup(lf, symidx, 1, &addr))
101 val32 = (Elf32_Addr)(addr + addend);
102 where32 = (Elf32_Addr *)where;
103 if (*where32 != val32)
107 case R_X86_64_COPY: /* none */
109 * There shouldn't be copy relocations in kernel
112 kprintf("kldload: unexpected R_COPY relocation\n");
116 case R_X86_64_GLOB_DAT: /* S */
117 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
118 if (lookup(lf, symidx, 1, &addr))
124 case R_X86_64_RELATIVE: /* B + A */
125 addr = relocbase + addend;
132 kprintf("kldload: unexpected relocation type %ld\n",
140 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
141 elf_lookup_fn lookup)
144 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
148 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
149 int type, elf_lookup_fn lookup)
152 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));