2 * Copyright (c) 2003 Jake Burkholder.
3 * Copyright 1996-1998 John D. Polstra.
4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/types.h>
34 #include <machine/elf.h>
39 #include <sys/link_elf.h>
41 #include "bootstrap.h"
43 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
46 * Apply a single intra-module relocation to the data. `relbase' is the
47 * target relocation base for the section (i.e. it corresponds to where
48 * r_offset == 0). `dataaddr' is the relocated address corresponding to
49 * the start of the data, and `len' is the number of bytes.
52 __elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr, const void *reldata,
53 int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len)
55 #if (defined(__aarch64__) || defined(__amd64__) || defined(__i386__)) && \
57 Elf64_Addr *where, val;
58 Elf_Addr addend, addr;
59 Elf_Size rtype, symidx;
65 rel = (const Elf_Rel *)reldata;
66 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
69 rtype = ELF_R_TYPE(rel->r_info);
70 symidx = ELF_R_SYM(rel->r_info);
74 rela = (const Elf_Rela *)reldata;
75 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
77 addend = rela->r_addend;
78 rtype = ELF_R_TYPE(rela->r_info);
79 symidx = ELF_R_SYM(rela->r_info);
85 if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
88 if (reltype == ELF_RELOC_REL)
91 #if defined(__aarch64__)
92 #define RELOC_RELATIVE R_AARCH64_RELATIVE
93 #define RELOC_IRELATIVE R_AARCH64_IRELATIVE
94 #elif defined(__amd64__) || defined(__i386__)
95 /* XXX, definitions not available on i386. */
97 #define R_X86_64_RELATIVE 8
98 #define R_X86_64_IRELATIVE 37
100 #define RELOC_RELATIVE R_X86_64_RELATIVE
101 #define RELOC_IRELATIVE R_X86_64_IRELATIVE
106 addr = (Elf_Addr)addend + relbase;
108 memcpy(where, &val, sizeof(val));
110 case RELOC_IRELATIVE:
111 /* leave it to kernel */
113 #if defined(__amd64__) || defined(__i386__)
114 case R_X86_64_64: /* S + A */
115 addr = symaddr(ef, symidx);
123 printf("\nunhandled relocation type %u\n", (u_int)rtype);
128 #elif defined(__i386__) && __ELF_WORD_SIZE == 32
129 Elf_Addr addend, addr, *where, val;
130 Elf_Size rtype, symidx;
132 const Elf_Rela *rela;
136 rel = (const Elf_Rel *)reldata;
137 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
140 rtype = ELF_R_TYPE(rel->r_info);
141 symidx = ELF_R_SYM(rel->r_info);
145 rela = (const Elf_Rela *)reldata;
146 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
148 addend = rela->r_addend;
149 rtype = ELF_R_TYPE(rela->r_info);
150 symidx = ELF_R_SYM(rela->r_info);
156 if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
159 if (reltype == ELF_RELOC_REL)
162 /* XXX, definitions not available on amd64. */
163 #define R_386_32 1 /* Add symbol value. */
164 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */
165 #define R_386_RELATIVE 8 /* Add load address of shared object. */
166 #define R_386_IRELATIVE 42
170 addr = addend + relbase;
173 case R_386_32: /* S + A */
174 addr = symaddr(ef, symidx);
180 case R_386_IRELATIVE:
181 /* leave it to kernel */
184 printf("\nunhandled relocation type %u\n", (u_int)rtype);
189 #elif defined(__powerpc__) || defined(__riscv)
191 const Elf_Rela *rela;
196 if (relbase + rela->r_offset >= dataaddr &&
197 relbase + rela->r_offset < dataaddr + len) {
198 switch (ELF_R_TYPE(rela->r_info)) {
199 #if defined(__powerpc__)
201 #elif defined(__riscv)
202 case R_RISCV_RELATIVE:
204 w = relbase + rela->r_addend;
205 bcopy(&w, (u_char *)data + (relbase +
206 rela->r_offset - dataaddr), sizeof(w));
209 printf("\nunhandled relocation type %u\n",
210 (u_int)ELF_R_TYPE(rela->r_info));