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>
33 #include <bootstrap.h>
36 #define ElfW_Rel Elf32_Rel
37 #define ElfW_Dyn Elf32_Dyn
38 #define ELFW_R_TYPE ELF32_R_TYPE
40 #define ElfW_Rel Elf64_Rel
41 #define ElfW_Dyn Elf64_Dyn
42 #define ELFW_R_TYPE ELF64_R_TYPE
46 * A simple relocator for IA32/AMD64 EFI binaries.
49 _reloc(unsigned long ImageBase, ElfW_Dyn *dynamic, EFI_HANDLE image_handle,
50 EFI_SYSTEM_TABLE *system_table)
52 unsigned long relsz, relent;
53 unsigned long *newaddr;
58 * Find the relocation address, its size and the relocation entry.
62 for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) {
63 switch (dynp->d_tag) {
66 rel = (ElfW_Rel *) ((unsigned long) dynp->d_un.d_ptr +
71 relsz = dynp->d_un.d_val;
75 relent = dynp->d_un.d_val;
83 * Perform the actual relocation.
84 * XXX: We are reusing code for the amd64 version of this, but
85 * we must make sure the relocation types are the same.
87 CTASSERT(R_386_NONE == R_X86_64_NONE);
88 CTASSERT(R_386_RELATIVE == R_X86_64_RELATIVE);
89 for (; relsz > 0; relsz -= relent) {
90 switch (ELFW_R_TYPE(rel->r_info)) {
92 /* No relocation needs be performed. */
95 /* Address relative to the base address. */
96 newaddr = (unsigned long *)(ImageBase + rel->r_offset);
97 *newaddr += ImageBase;
100 /* XXX: do we need other relocations ? */
103 rel = (ElfW_Rel *) ((caddr_t) rel + relent);
106 return (EFI_SUCCESS);