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>
39 * Apply relocations to the values we got from the file. `relbase' is the
40 * target relocation address of the section, and `dataoff' is the target
41 * relocation address of the data in `dest'.
44 ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
45 Elf_Off dataoff, size_t len, void *dest)
47 Elf64_Addr *where, val;
48 Elf32_Addr *where32, val32;
49 Elf_Addr addend, addr;
50 Elf_Size rtype, symidx;
56 rel = (const Elf_Rel *)reldata;
57 where = (Elf_Addr *)(dest + relbase + rel->r_offset - dataoff);
59 rtype = ELF_R_TYPE(rel->r_info);
60 symidx = ELF_R_SYM(rel->r_info);
63 rela = (const Elf_Rela *)reldata;
64 where = (Elf_Addr *)(dest + relbase + rela->r_offset - dataoff);
65 addend = rela->r_addend;
66 rtype = ELF_R_TYPE(rela->r_info);
67 symidx = ELF_R_SYM(rela->r_info);
73 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
76 if (reltype == EF_RELOC_REL) {
77 /* Addend is 32 bit on 32 bit relocs */
81 addend = *(Elf32_Addr *)where;
90 case R_X86_64_NONE: /* none */
92 case R_X86_64_64: /* S + A */
93 addr = EF_SYMADDR(ef, symidx);
97 case R_X86_64_32S: /* S + A sign extend */
98 addr = EF_SYMADDR(ef, symidx);
99 val32 = (Elf32_Addr)(addr + addend);
100 where32 = (Elf32_Addr *)where;
103 case R_X86_64_GLOB_DAT: /* S */
104 addr = EF_SYMADDR(ef, symidx);
107 case R_X86_64_RELATIVE: /* B + A */
108 addr = (Elf_Addr)addend + relbase;
113 warnx("unhandled relocation type %d", (int)rtype);