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 #include <sys/types.h> 32 #include <machine/elf.h> 33 34 #include <stand.h> 35 36 #define FREEBSD_ELF 37 #include <sys/link_elf.h> 38 39 #include "bootstrap.h" 40 41 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) 42 43 /* 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. 48 */ 49 int 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) 52 { 53 #if (defined(__aarch64__) || defined(__amd64__) || defined(__i386__)) && \ 54 __ELF_WORD_SIZE == 64 55 Elf64_Addr *where, val; 56 Elf_Addr addend, addr; 57 Elf_Size rtype; 58 #if defined(__amd64__) || defined(__i386__) 59 Elf_Size symidx; 60 #endif 61 const Elf_Rel *rel; 62 const Elf_Rela *rela; 63 64 switch (reltype) { 65 case ELF_RELOC_REL: 66 rel = (const Elf_Rel *)reldata; 67 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 68 dataaddr); 69 addend = 0; 70 rtype = ELF_R_TYPE(rel->r_info); 71 #if defined(__amd64__) || defined(__i386__) 72 symidx = ELF_R_SYM(rel->r_info); 73 #endif 74 addend = 0; 75 break; 76 case ELF_RELOC_RELA: 77 rela = (const Elf_Rela *)reldata; 78 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 79 dataaddr); 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); 84 #endif 85 break; 86 default: 87 return (EINVAL); 88 } 89 90 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 91 return (0); 92 93 if (reltype == ELF_RELOC_REL) 94 addend = *where; 95 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 37 104 105 #define RELOC_RELATIVE R_X86_64_RELATIVE 106 #define RELOC_IRELATIVE R_X86_64_IRELATIVE 107 #endif 108 109 switch (rtype) { 110 case RELOC_RELATIVE: 111 addr = (Elf_Addr)addend + relbase; 112 val = addr; 113 memcpy(where, &val, sizeof(val)); 114 break; 115 case RELOC_IRELATIVE: 116 /* leave it to kernel */ 117 break; 118 #if defined(__amd64__) || defined(__i386__) 119 case R_X86_64_64: /* S + A */ 120 addr = symaddr(ef, symidx); 121 if (addr == 0) 122 return (ESRCH); 123 val = addr + addend; 124 *where = val; 125 break; 126 #endif 127 default: 128 printf("\nunhandled relocation type %u\n", (u_int)rtype); 129 return (EFTYPE); 130 } 131 132 return (0); 133 #elif defined(__i386__) && __ELF_WORD_SIZE == 32 134 Elf_Addr addend, addr, *where, val; 135 Elf_Size rtype, symidx; 136 const Elf_Rel *rel; 137 const Elf_Rela *rela; 138 139 switch (reltype) { 140 case ELF_RELOC_REL: 141 rel = (const Elf_Rel *)reldata; 142 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 143 dataaddr); 144 addend = 0; 145 rtype = ELF_R_TYPE(rel->r_info); 146 symidx = ELF_R_SYM(rel->r_info); 147 addend = 0; 148 break; 149 case ELF_RELOC_RELA: 150 rela = (const Elf_Rela *)reldata; 151 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 152 dataaddr); 153 addend = rela->r_addend; 154 rtype = ELF_R_TYPE(rela->r_info); 155 symidx = ELF_R_SYM(rela->r_info); 156 break; 157 default: 158 return (EINVAL); 159 } 160 161 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 162 return (0); 163 164 if (reltype == ELF_RELOC_REL) 165 addend = *where; 166 167 /* 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 42 172 173 switch (rtype) { 174 case R_386_RELATIVE: 175 addr = addend + relbase; 176 *where = addr; 177 break; 178 case R_386_32: /* S + A */ 179 addr = symaddr(ef, symidx); 180 if (addr == 0) 181 return (ESRCH); 182 val = addr + addend; 183 *where = val; 184 break; 185 case R_386_IRELATIVE: 186 /* leave it to kernel */ 187 break; 188 default: 189 printf("\nunhandled relocation type %u\n", (u_int)rtype); 190 return (EFTYPE); 191 } 192 193 return (0); 194 #elif defined(__powerpc__) || defined(__riscv) 195 Elf_Size w; 196 const Elf_Rela *rela; 197 198 switch (reltype) { 199 case ELF_RELOC_RELA: 200 rela = reldata; 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__) 205 case R_PPC_RELATIVE: 206 #elif defined(__riscv) 207 case R_RISCV_RELATIVE: 208 #endif 209 w = relbase + rela->r_addend; 210 bcopy(&w, (u_char *)data + (relbase + 211 rela->r_offset - dataaddr), sizeof(w)); 212 break; 213 default: 214 printf("\nunhandled relocation type %u\n", 215 (u_int)ELF_R_TYPE(rela->r_info)); 216 return (EFTYPE); 217 } 218 } 219 break; 220 } 221 222 return (0); 223 #else 224 return (EOPNOTSUPP); 225 #endif 226 } 227