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 <link.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 8 118 119 switch (rtype) { 120 case R_X86_64_64: /* S + A */ 121 addr = symaddr(ef, symidx); 122 if (addr == 0) 123 return (ESRCH); 124 val = addr + addend; 125 *where = val; 126 break; 127 case R_X86_64_RELATIVE: 128 addr = (Elf_Addr)addend + relbase; 129 val = addr; 130 *where = val; 131 break; 132 default: 133 printf("\nunhandled relocation type %u\n", (u_int)rtype); 134 return (EFTYPE); 135 } 136 137 return (0); 138 #elif defined(__i386__) && __ELF_WORD_SIZE == 32 139 Elf_Addr addend, addr, *where, val; 140 Elf_Size rtype, symidx; 141 const Elf_Rel *rel; 142 const Elf_Rela *rela; 143 144 switch (reltype) { 145 case ELF_RELOC_REL: 146 rel = (const Elf_Rel *)reldata; 147 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 148 dataaddr); 149 addend = 0; 150 rtype = ELF_R_TYPE(rel->r_info); 151 symidx = ELF_R_SYM(rel->r_info); 152 addend = 0; 153 break; 154 case ELF_RELOC_RELA: 155 rela = (const Elf_Rela *)reldata; 156 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 157 dataaddr); 158 addend = rela->r_addend; 159 rtype = ELF_R_TYPE(rela->r_info); 160 symidx = ELF_R_SYM(rela->r_info); 161 break; 162 default: 163 return (EINVAL); 164 } 165 166 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 167 return (0); 168 169 if (reltype == ELF_RELOC_REL) 170 addend = *where; 171 172 /* XXX, definitions not available on amd64. */ 173 #define R_386_32 1 /* Add symbol value. */ 174 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */ 175 #define R_386_RELATIVE 8 /* Add load address of shared object. */ 176 177 switch (rtype) { 178 case R_386_RELATIVE: 179 addr = addend + relbase; 180 *where = addr; 181 break; 182 case R_386_32: /* S + A */ 183 addr = symaddr(ef, symidx); 184 if (addr == 0) 185 return (ESRCH); 186 val = addr + addend; 187 *where = val; 188 break; 189 default: 190 printf("\nunhandled relocation type %u\n", (u_int)rtype); 191 return (EFTYPE); 192 } 193 194 return (0); 195 #elif defined(__powerpc__) 196 Elf_Size w; 197 const Elf_Rela *rela; 198 199 switch (reltype) { 200 case ELF_RELOC_RELA: 201 rela = reldata; 202 if (relbase + rela->r_offset >= dataaddr && 203 relbase + rela->r_offset < dataaddr + len) { 204 switch (ELF_R_TYPE(rela->r_info)) { 205 case R_PPC_RELATIVE: 206 w = relbase + rela->r_addend; 207 bcopy(&w, (u_char *)data + (relbase + 208 rela->r_offset - dataaddr), sizeof(w)); 209 break; 210 default: 211 printf("\nunhandled relocation type %u\n", 212 (u_int)ELF_R_TYPE(rela->r_info)); 213 return (EFTYPE); 214 } 215 } 216 break; 217 } 218 219 return (0); 220 #else 221 (void)ef; 222 (void)symaddr; 223 (void)reldata; 224 (void)reltype; 225 (void)relbase; 226 (void)dataaddr; 227 (void)data; 228 (void)len; 229 return (EOPNOTSUPP); 230 #endif 231 } 232