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>
31 #include <sys/elf32.h>
33 #include <bootstrap.h>
36 * A simple relocator for IA32 EFI binaries.
39 _reloc(unsigned long ImageBase, Elf32_Dyn *dynamic, EFI_HANDLE image_handle,
40 EFI_SYSTEM_TABLE *system_table)
42 unsigned long relsz, relent;
43 unsigned long *newaddr;
48 * Find the relocation address, its size and the relocation entry.
52 for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) {
53 switch (dynp->d_tag) {
55 rel = (Elf32_Rel *) ((unsigned long) dynp->d_un.d_ptr +
59 relsz = dynp->d_un.d_val;
62 relent = dynp->d_un.d_val;
70 * Perform the actual relocation.
71 * XXX: We are reusing code for the amd64 version of this, but
72 * we must make sure the relocation types are the same.
74 CTASSERT(R_386_NONE == R_X86_64_NONE);
75 CTASSERT(R_386_RELATIVE == R_X86_64_RELATIVE);
76 for (; relsz > 0; relsz -= relent) {
77 switch (ELF32_R_TYPE(rel->r_info)) {
79 /* No relocation needs be performed. */
82 /* Address relative to the base address. */
83 newaddr = (unsigned long *)(ImageBase + rel->r_offset);
84 *newaddr += ImageBase;
87 /* XXX: do we need other relocations ? */
88 return (EFI_LOAD_ERROR);
90 rel = (Elf32_Rel *) ((caddr_t) rel + relent);