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 #include <sys/types.h>
32 #include <machine/elf.h>
37 #include <sys/link_elf.h>
39 #include "bootstrap.h"
41 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
44 * Apply a single intra-module relocation to the data. `relbase' is the
45 * target relocation base for the section (i.e. it corresponds to where
46 * r_offset == 0). `dataaddr' is the relocated address corresponding to
47 * the start of the data, and `len' is the number of bytes.
50 __elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr, const void *reldata,
51 int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len)
53 #if (defined(__aarch64__) || defined(__amd64__) || defined(__i386__)) && \
55 Elf64_Addr *where, val;
56 Elf_Addr addend, addr;
58 #if defined(__amd64__) || defined(__i386__)
66 rel = (const Elf_Rel *)reldata;
67 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
70 rtype = ELF_R_TYPE(rel->r_info);
71 #if defined(__amd64__) || defined(__i386__)
72 symidx = ELF_R_SYM(rel->r_info);
77 rela = (const Elf_Rela *)reldata;
78 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
80 addend = rela->r_addend;
81 rtype = ELF_R_TYPE(rela->r_info);
82 #if defined(__amd64__) || defined(__i386__)
83 symidx = ELF_R_SYM(rela->r_info);
90 if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
93 if (reltype == ELF_RELOC_REL)
96 #if defined(__aarch64__)
97 #define RELOC_RELATIVE R_AARCH64_RELATIVE
98 #define RELOC_IRELATIVE R_AARCH64_IRELATIVE
99 #elif defined(__amd64__) || defined(__i386__)
100 /* XXX, definitions not available on i386. */
101 #define R_X86_64_64 1
102 #define R_X86_64_RELATIVE 8
103 #define R_X86_64_IRELATIVE 37
105 #define RELOC_RELATIVE R_X86_64_RELATIVE
106 #define RELOC_IRELATIVE R_X86_64_IRELATIVE
111 addr = (Elf_Addr)addend + relbase;
113 memcpy(where, &val, sizeof(val));
115 case RELOC_IRELATIVE:
116 /* leave it to kernel */
118 #if defined(__amd64__) || defined(__i386__)
119 case R_X86_64_64: /* S + A */
120 addr = symaddr(ef, symidx);
128 printf("\nunhandled relocation type %u\n", (u_int)rtype);
133 #elif defined(__i386__) && __ELF_WORD_SIZE == 32
134 Elf_Addr addend, addr, *where, val;
135 Elf_Size rtype, symidx;
137 const Elf_Rela *rela;
141 rel = (const Elf_Rel *)reldata;
142 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
145 rtype = ELF_R_TYPE(rel->r_info);
146 symidx = ELF_R_SYM(rel->r_info);
150 rela = (const Elf_Rela *)reldata;
151 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
153 addend = rela->r_addend;
154 rtype = ELF_R_TYPE(rela->r_info);
155 symidx = ELF_R_SYM(rela->r_info);
161 if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
164 if (reltype == ELF_RELOC_REL)
167 /* XXX, definitions not available on amd64. */
168 #define R_386_32 1 /* Add symbol value. */
169 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */
170 #define R_386_RELATIVE 8 /* Add load address of shared object. */
171 #define R_386_IRELATIVE 42
175 addr = addend + relbase;
178 case R_386_32: /* S + A */
179 addr = symaddr(ef, symidx);
185 case R_386_IRELATIVE:
186 /* leave it to kernel */
189 printf("\nunhandled relocation type %u\n", (u_int)rtype);
194 #elif defined(__powerpc__) || defined(__riscv)
196 const Elf_Rela *rela;
201 if (relbase + rela->r_offset >= dataaddr &&
202 relbase + rela->r_offset < dataaddr + len) {
203 switch (ELF_R_TYPE(rela->r_info)) {
204 #if defined(__powerpc__)
206 #elif defined(__riscv)
207 case R_RISCV_RELATIVE:
209 w = relbase + rela->r_addend;
210 bcopy(&w, (u_char *)data + (relbase +
211 rela->r_offset - dataaddr), sizeof(w));
214 printf("\nunhandled relocation type %u\n",
215 (u_int)ELF_R_TYPE(rela->r_info));