2 * Copyright (c) 2008-2010 Rui Paulo <rpaulo@FreeBSD.org>
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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
32 #include <bootstrap.h>
34 #if defined(__aarch64__)
35 #define ElfW_Rel Elf64_Rela
36 #define ElfW_Dyn Elf64_Dyn
37 #define ELFW_R_TYPE ELF64_R_TYPE
39 #elif defined(__arm__) || defined(__i386__)
40 #define ElfW_Rel Elf32_Rel
41 #define ElfW_Dyn Elf32_Dyn
42 #define ELFW_R_TYPE ELF32_R_TYPE
43 #elif defined(__amd64__)
44 #define ElfW_Rel Elf64_Rel
45 #define ElfW_Dyn Elf64_Dyn
46 #define ELFW_R_TYPE ELF64_R_TYPE
48 #error architecture not supported
50 #if defined(__aarch64__)
51 #define RELOC_TYPE_NONE R_AARCH64_NONE
52 #define RELOC_TYPE_RELATIVE R_AARCH64_RELATIVE
53 #elif defined(__amd64__)
54 #define RELOC_TYPE_NONE R_X86_64_NONE
55 #define RELOC_TYPE_RELATIVE R_X86_64_RELATIVE
56 #elif defined(__arm__)
57 #define RELOC_TYPE_NONE R_ARM_NONE
58 #define RELOC_TYPE_RELATIVE R_ARM_RELATIVE
59 #elif defined(__i386__)
60 #define RELOC_TYPE_NONE R_386_NONE
61 #define RELOC_TYPE_RELATIVE R_386_RELATIVE
64 void self_reloc(Elf_Addr baseaddr, ElfW_Dyn *dynamic);
67 * A simple elf relocator.
70 self_reloc(Elf_Addr baseaddr, ElfW_Dyn *dynamic)
72 Elf_Word relsz, relent;
78 * Find the relocation address, its size and the relocation entry.
82 for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) {
83 switch (dynp->d_tag) {
86 rel = (ElfW_Rel *)(dynp->d_un.d_ptr + baseaddr);
90 relsz = dynp->d_un.d_val;
94 relent = dynp->d_un.d_val;
102 * Perform the actual relocation.
104 for (; relsz > 0; relsz -= relent) {
105 switch (ELFW_R_TYPE(rel->r_info)) {
106 case RELOC_TYPE_NONE:
107 /* No relocation needs be performed. */
110 case RELOC_TYPE_RELATIVE:
111 /* Address relative to the base address. */
112 newaddr = (Elf_Addr *)(rel->r_offset + baseaddr);
113 *newaddr += baseaddr;
114 /* Add the addend when the ABI uses them */
116 *newaddr += rel->r_addend;
120 /* XXX: do we need other relocations ? */
123 rel = (ElfW_Rel *)(void *)((caddr_t) rel + relent);