2 * Copyright (c) 2003 Jake Burkholder.
3 * Copyright 1996-1998 John D. Polstra.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/types.h>
31 #include <machine/elf.h>
40 * Apply relocations to the values we got from the file. `relbase' is the
41 * target relocation address of the section, and `dataoff' is the target
42 * relocation address of the data in `dest'.
45 ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
46 Elf_Off dataoff, size_t len, void *dest)
48 Elf64_Addr *where, val;
49 Elf32_Addr *where32, val32;
50 Elf_Addr addend, addr;
51 Elf_Size rtype, symidx;
57 rel = (const Elf_Rel *)reldata;
58 where = (Elf_Addr *)(dest + relbase + rel->r_offset - dataoff);
60 rtype = ELF_R_TYPE(rel->r_info);
61 symidx = ELF_R_SYM(rel->r_info);
64 rela = (const Elf_Rela *)reldata;
65 where = (Elf_Addr *)(dest + relbase + rela->r_offset - dataoff);
66 addend = rela->r_addend;
67 rtype = ELF_R_TYPE(rela->r_info);
68 symidx = ELF_R_SYM(rela->r_info);
74 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
77 if (reltype == EF_RELOC_REL) {
78 /* Addend is 32 bit on 32 bit relocs */
82 addend = *(Elf32_Addr *)where;
91 case R_X86_64_NONE: /* none */
93 case R_X86_64_64: /* S + A */
94 addr = EF_SYMADDR(ef, symidx);
98 case R_X86_64_32S: /* S + A sign extend */
99 addr = EF_SYMADDR(ef, symidx);
100 val32 = (Elf32_Addr)(addr + addend);
101 where32 = (Elf32_Addr *)where;
104 case R_X86_64_GLOB_DAT: /* S */
105 addr = EF_SYMADDR(ef, symidx);
108 case R_X86_64_RELATIVE: /* B + A */
109 addr = (Elf_Addr)addend + relbase;
114 warnx("unhandled relocation type %d", (int)rtype);