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 #ifdef __sparc__ 56 Elf_Size w; 57 const Elf_Rela *a; 58 59 switch (reltype) { 60 case ELF_RELOC_RELA: 61 a = reldata; 62 if (relbase + a->r_offset >= dataaddr && 63 relbase + a->r_offset < dataaddr + len) { 64 switch (ELF_R_TYPE(a->r_info)) { 65 case R_SPARC_RELATIVE: 66 w = relbase + a->r_addend; 67 bcopy(&w, (u_char *)data + (relbase + 68 a->r_offset - dataaddr), sizeof(w)); 69 break; 70 default: 71 printf("\nunhandled relocation type %u\n", 72 (u_int)ELF_R_TYPE(a->r_info)); 73 return (EFTYPE); 74 } 75 } 76 break; 77 } 78 79 return (0); 80 #elif (defined(__i386__) || defined(__amd64__)) && __ELF_WORD_SIZE == 64 81 Elf64_Addr *where, val; 82 Elf_Addr addend, addr; 83 Elf_Size rtype, symidx; 84 const Elf_Rel *rel; 85 const Elf_Rela *rela; 86 87 switch (reltype) { 88 case ELF_RELOC_REL: 89 rel = (const Elf_Rel *)reldata; 90 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 91 dataaddr); 92 addend = 0; 93 rtype = ELF_R_TYPE(rel->r_info); 94 symidx = ELF_R_SYM(rel->r_info); 95 addend = 0; 96 break; 97 case ELF_RELOC_RELA: 98 rela = (const Elf_Rela *)reldata; 99 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 100 dataaddr); 101 addend = rela->r_addend; 102 rtype = ELF_R_TYPE(rela->r_info); 103 symidx = ELF_R_SYM(rela->r_info); 104 break; 105 default: 106 return (EINVAL); 107 } 108 109 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 110 return (0); 111 112 if (reltype == ELF_RELOC_REL) 113 addend = *where; 114 115 /* XXX, definitions not available on i386. */ 116 #define R_X86_64_64 1 117 #define R_X86_64_RELATIVE 8 118 #define R_X86_64_IRELATIVE 37 119 120 switch (rtype) { 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 case R_X86_64_RELATIVE: 129 addr = (Elf_Addr)addend + relbase; 130 val = addr; 131 *where = val; 132 break; 133 case R_X86_64_IRELATIVE: 134 /* leave it to kernel */ 135 break; 136 default: 137 printf("\nunhandled relocation type %u\n", (u_int)rtype); 138 return (EFTYPE); 139 } 140 141 return (0); 142 #elif defined(__i386__) && __ELF_WORD_SIZE == 32 143 Elf_Addr addend, addr, *where, val; 144 Elf_Size rtype, symidx; 145 const Elf_Rel *rel; 146 const Elf_Rela *rela; 147 148 switch (reltype) { 149 case ELF_RELOC_REL: 150 rel = (const Elf_Rel *)reldata; 151 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 152 dataaddr); 153 addend = 0; 154 rtype = ELF_R_TYPE(rel->r_info); 155 symidx = ELF_R_SYM(rel->r_info); 156 addend = 0; 157 break; 158 case ELF_RELOC_RELA: 159 rela = (const Elf_Rela *)reldata; 160 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 161 dataaddr); 162 addend = rela->r_addend; 163 rtype = ELF_R_TYPE(rela->r_info); 164 symidx = ELF_R_SYM(rela->r_info); 165 break; 166 default: 167 return (EINVAL); 168 } 169 170 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 171 return (0); 172 173 if (reltype == ELF_RELOC_REL) 174 addend = *where; 175 176 /* XXX, definitions not available on amd64. */ 177 #define R_386_32 1 /* Add symbol value. */ 178 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */ 179 #define R_386_RELATIVE 8 /* Add load address of shared object. */ 180 #define R_386_IRELATIVE 42 181 182 switch (rtype) { 183 case R_386_RELATIVE: 184 addr = addend + relbase; 185 *where = addr; 186 break; 187 case R_386_32: /* S + A */ 188 addr = symaddr(ef, symidx); 189 if (addr == 0) 190 return (ESRCH); 191 val = addr + addend; 192 *where = val; 193 break; 194 case R_386_IRELATIVE: 195 /* leave it to kernel */ 196 break; 197 default: 198 printf("\nunhandled relocation type %u\n", (u_int)rtype); 199 return (EFTYPE); 200 } 201 202 return (0); 203 #elif defined(__powerpc__) 204 Elf_Size w; 205 const Elf_Rela *rela; 206 207 switch (reltype) { 208 case ELF_RELOC_RELA: 209 rela = reldata; 210 if (relbase + rela->r_offset >= dataaddr && 211 relbase + rela->r_offset < dataaddr + len) { 212 switch (ELF_R_TYPE(rela->r_info)) { 213 case R_PPC_RELATIVE: 214 w = relbase + rela->r_addend; 215 bcopy(&w, (u_char *)data + (relbase + 216 rela->r_offset - dataaddr), sizeof(w)); 217 break; 218 default: 219 printf("\nunhandled relocation type %u\n", 220 (u_int)ELF_R_TYPE(rela->r_info)); 221 return (EFTYPE); 222 } 223 } 224 break; 225 } 226 227 return (0); 228 #else 229 return (EOPNOTSUPP); 230 #endif 231 } 232