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/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <machine/elf.h> 35 36 #include <stand.h> 37 38 #define FREEBSD_ELF 39 #include <sys/link_elf.h> 40 41 #include "bootstrap.h" 42 43 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) 44 45 /* 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. 50 */ 51 int 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) 54 { 55 #if (defined(__aarch64__) || defined(__amd64__) || defined(__i386__)) && \ 56 __ELF_WORD_SIZE == 64 57 Elf64_Addr *where, val; 58 Elf_Addr addend, addr; 59 Elf_Size rtype; 60 #if defined(__amd64__) || defined(__i386__) 61 Elf_Size symidx; 62 #endif 63 const Elf_Rel *rel; 64 const Elf_Rela *rela; 65 66 switch (reltype) { 67 case ELF_RELOC_REL: 68 rel = (const Elf_Rel *)reldata; 69 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 70 dataaddr); 71 addend = 0; 72 rtype = ELF_R_TYPE(rel->r_info); 73 #if defined(__amd64__) || defined(__i386__) 74 symidx = ELF_R_SYM(rel->r_info); 75 #endif 76 addend = 0; 77 break; 78 case ELF_RELOC_RELA: 79 rela = (const Elf_Rela *)reldata; 80 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 81 dataaddr); 82 addend = rela->r_addend; 83 rtype = ELF_R_TYPE(rela->r_info); 84 #if defined(__amd64__) || defined(__i386__) 85 symidx = ELF_R_SYM(rela->r_info); 86 #endif 87 break; 88 default: 89 return (EINVAL); 90 } 91 92 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 93 return (0); 94 95 if (reltype == ELF_RELOC_REL) 96 addend = *where; 97 98 #if defined(__aarch64__) 99 #define RELOC_RELATIVE R_AARCH64_RELATIVE 100 #define RELOC_IRELATIVE R_AARCH64_IRELATIVE 101 #elif defined(__amd64__) || defined(__i386__) 102 /* XXX, definitions not available on i386. */ 103 #define R_X86_64_64 1 104 #define R_X86_64_RELATIVE 8 105 #define R_X86_64_IRELATIVE 37 106 107 #define RELOC_RELATIVE R_X86_64_RELATIVE 108 #define RELOC_IRELATIVE R_X86_64_IRELATIVE 109 #endif 110 111 switch (rtype) { 112 case RELOC_RELATIVE: 113 addr = (Elf_Addr)addend + relbase; 114 val = addr; 115 memcpy(where, &val, sizeof(val)); 116 break; 117 case RELOC_IRELATIVE: 118 /* leave it to kernel */ 119 break; 120 #if defined(__amd64__) || defined(__i386__) 121 case R_X86_64_64: /* S + A */ 122 addr = symaddr(ef, symidx); 123 if (addr == 0) 124 return (ESRCH); 125 val = addr + addend; 126 *where = val; 127 break; 128 #endif 129 default: 130 printf("\nunhandled relocation type %u\n", (u_int)rtype); 131 return (EFTYPE); 132 } 133 134 return (0); 135 #elif defined(__i386__) && __ELF_WORD_SIZE == 32 136 Elf_Addr addend, addr, *where, val; 137 Elf_Size rtype, symidx; 138 const Elf_Rel *rel; 139 const Elf_Rela *rela; 140 141 switch (reltype) { 142 case ELF_RELOC_REL: 143 rel = (const Elf_Rel *)reldata; 144 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 145 dataaddr); 146 addend = 0; 147 rtype = ELF_R_TYPE(rel->r_info); 148 symidx = ELF_R_SYM(rel->r_info); 149 addend = 0; 150 break; 151 case ELF_RELOC_RELA: 152 rela = (const Elf_Rela *)reldata; 153 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 154 dataaddr); 155 addend = rela->r_addend; 156 rtype = ELF_R_TYPE(rela->r_info); 157 symidx = ELF_R_SYM(rela->r_info); 158 break; 159 default: 160 return (EINVAL); 161 } 162 163 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 164 return (0); 165 166 if (reltype == ELF_RELOC_REL) 167 addend = *where; 168 169 /* XXX, definitions not available on amd64. */ 170 #define R_386_32 1 /* Add symbol value. */ 171 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */ 172 #define R_386_RELATIVE 8 /* Add load address of shared object. */ 173 #define R_386_IRELATIVE 42 174 175 switch (rtype) { 176 case R_386_RELATIVE: 177 addr = addend + relbase; 178 *where = addr; 179 break; 180 case R_386_32: /* S + A */ 181 addr = symaddr(ef, symidx); 182 if (addr == 0) 183 return (ESRCH); 184 val = addr + addend; 185 *where = val; 186 break; 187 case R_386_IRELATIVE: 188 /* leave it to kernel */ 189 break; 190 default: 191 printf("\nunhandled relocation type %u\n", (u_int)rtype); 192 return (EFTYPE); 193 } 194 195 return (0); 196 #elif defined(__powerpc__) || defined(__riscv) 197 Elf_Size w; 198 const Elf_Rela *rela; 199 200 switch (reltype) { 201 case ELF_RELOC_RELA: 202 rela = reldata; 203 if (relbase + rela->r_offset >= dataaddr && 204 relbase + rela->r_offset < dataaddr + len) { 205 switch (ELF_R_TYPE(rela->r_info)) { 206 #if defined(__powerpc__) 207 case R_PPC_RELATIVE: 208 #elif defined(__riscv) 209 case R_RISCV_RELATIVE: 210 #endif 211 w = relbase + rela->r_addend; 212 bcopy(&w, (u_char *)data + (relbase + 213 rela->r_offset - dataaddr), sizeof(w)); 214 break; 215 default: 216 printf("\nunhandled relocation type %u\n", 217 (u_int)ELF_R_TYPE(rela->r_info)); 218 return (EFTYPE); 219 } 220 } 221 break; 222 } 223 224 return (0); 225 #else 226 return (EOPNOTSUPP); 227 #endif 228 } 229