1/*- 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> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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. 16 * 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 27 * SUCH DAMAGE. 28 */ 29 30#include <sys/types.h> 31#include <machine/elf.h> 32 33#include <stand.h> 34 35#include <sys/link_elf.h> 36 37#include "bootstrap.h" 38 39#define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) 40 41/* 42 * Apply a single intra-module relocation to the data. `relbase' is the 43 * target relocation base for the section (i.e. it corresponds to where 44 * r_offset == 0). `dataaddr' is the relocated address corresponding to 45 * the start of the data, and `len' is the number of bytes. 46 */ 47int 48__elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr, const void *reldata, 49 int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len) 50{ 51#if (defined(__aarch64__) || defined(__amd64__) || defined(__i386__)) && \ 52 __ELF_WORD_SIZE == 64 53 Elf64_Addr *where, val; 54 Elf_Addr addend, addr; 55 Elf_Size rtype; 56#if defined(__amd64__) || defined(__i386__) 57 Elf_Size symidx; 58#endif 59 const Elf_Rel *rel; 60 const Elf_Rela *rela; 61 62 switch (reltype) { 63 case ELF_RELOC_REL: 64 rel = (const Elf_Rel *)reldata; 65 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 66 dataaddr); 67 addend = 0; 68 rtype = ELF_R_TYPE(rel->r_info); 69#if defined(__amd64__) || defined(__i386__) 70 symidx = ELF_R_SYM(rel->r_info); 71#endif 72 addend = 0; 73 break; 74 case ELF_RELOC_RELA: 75 rela = (const Elf_Rela *)reldata; 76 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 77 dataaddr); 78 addend = rela->r_addend; 79 rtype = ELF_R_TYPE(rela->r_info); 80#if defined(__amd64__) || defined(__i386__) 81 symidx = ELF_R_SYM(rela->r_info); 82#endif 83 break; 84 default: 85 return (EINVAL); 86 } 87 88 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 89 return (0); 90 91 if (reltype == ELF_RELOC_REL) 92 addend = *where; 93 94#if defined(__aarch64__) 95#define RELOC_RELATIVE R_AARCH64_RELATIVE 96#define RELOC_IRELATIVE R_AARCH64_IRELATIVE 97#elif defined(__amd64__) || defined(__i386__) 98/* XXX, definitions not available on i386. */ 99#define R_X86_64_64 1 100#define R_X86_64_RELATIVE 8 101#define R_X86_64_IRELATIVE 37 102 103#define RELOC_RELATIVE R_X86_64_RELATIVE 104#define RELOC_IRELATIVE R_X86_64_IRELATIVE 105#endif 106 107 switch (rtype) { 108 case RELOC_RELATIVE: 109 addr = (Elf_Addr)addend + relbase; 110 val = addr; 111 memcpy(where, &val, sizeof(val)); 112 break; 113 case RELOC_IRELATIVE: 114 /* leave it to kernel */ 115 break; 116#if defined(__amd64__) || defined(__i386__) 117 case R_X86_64_64: /* S + A */ 118 addr = symaddr(ef, symidx); 119 if (addr == 0) 120 return (ESRCH); 121 val = addr + addend; 122 *where = val; 123 break; 124#endif 125 default: 126 printf("\nunhandled relocation type %u\n", (u_int)rtype); 127 return (EFTYPE); 128 } 129 130 return (0); 131#elif defined(__i386__) && __ELF_WORD_SIZE == 32 132 Elf_Addr addend, addr, *where, val; 133 Elf_Size rtype, symidx; 134 const Elf_Rel *rel; 135 const Elf_Rela *rela; 136 137 switch (reltype) { 138 case ELF_RELOC_REL: 139 rel = (const Elf_Rel *)reldata; 140 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 141 dataaddr); 142 addend = 0; 143 rtype = ELF_R_TYPE(rel->r_info); 144 symidx = ELF_R_SYM(rel->r_info); 145 addend = 0; 146 break; 147 case ELF_RELOC_RELA: 148 rela = (const Elf_Rela *)reldata; 149 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 150 dataaddr); 151 addend = rela->r_addend; 152 rtype = ELF_R_TYPE(rela->r_info); 153 symidx = ELF_R_SYM(rela->r_info); 154 break; 155 default: 156 return (EINVAL); 157 } 158 159 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 160 return (0); 161 162 if (reltype == ELF_RELOC_REL) 163 addend = *where; 164 165/* XXX, definitions not available on amd64. */ 166#define R_386_32 1 /* Add symbol value. */ 167#define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */ 168#define R_386_RELATIVE 8 /* Add load address of shared object. */ 169#define R_386_IRELATIVE 42 170 171 switch (rtype) { 172 case R_386_RELATIVE: 173 addr = addend + relbase; 174 *where = addr; 175 break; 176 case R_386_32: /* S + A */ 177 addr = symaddr(ef, symidx); 178 if (addr == 0) 179 return (ESRCH); 180 val = addr + addend; 181 *where = val; 182 break; 183 case R_386_IRELATIVE: 184 /* leave it to kernel */ 185 break; 186 default: 187 printf("\nunhandled relocation type %u\n", (u_int)rtype); 188 return (EFTYPE); 189 } 190 191 return (0); 192#elif defined(__powerpc__) || defined(__riscv) 193 Elf_Size w; 194 const Elf_Rela *rela; 195 196 switch (reltype) { 197 case ELF_RELOC_RELA: 198 rela = reldata; 199 if (relbase + rela->r_offset >= dataaddr && 200 relbase + rela->r_offset < dataaddr + len) { 201 switch (ELF_R_TYPE(rela->r_info)) { 202#if defined(__powerpc__) 203 case R_PPC_RELATIVE: 204#elif defined(__riscv) 205 case R_RISCV_RELATIVE: 206#endif 207 w = relbase + rela->r_addend; 208 bcopy(&w, (u_char *)data + (relbase + 209 rela->r_offset - dataaddr), sizeof(w)); 210 break; 211 default: 212 printf("\nunhandled relocation type %u\n", 213 (u_int)ELF_R_TYPE(rela->r_info)); 214 return (EFTYPE); 215 } 216 } 217 break; 218 } 219 220 return (0); 221#else 222 return (EOPNOTSUPP); 223#endif 224} 225