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 <errno.h> 37#include <stand.h> 38 39#define FREEBSD_ELF 40#include <link.h> 41 42#include "bootstrap.h" 43 44#define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) 45 46/* 47 * Apply a single intra-module relocation to the data. `relbase' is the 48 * target relocation base for the section (i.e. it corresponds to where 49 * r_offset == 0). `dataaddr' is the relocated address corresponding to 50 * the start of the data, and `len' is the number of bytes. 51 */ 52int 53__elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr, const void *reldata, 54 int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len) 55{ 56#ifdef __sparc__ 57 Elf_Size w; 58 const Elf_Rela *a; 59 60 switch (reltype) { 61 case ELF_RELOC_RELA: 62 a = reldata; 63 if (relbase + a->r_offset >= dataaddr && 64 relbase + a->r_offset < dataaddr + len) { 65 switch (ELF_R_TYPE(a->r_info)) { 66 case R_SPARC_RELATIVE: 67 w = relbase + a->r_addend; 68 bcopy(&w, (u_char *)data + (relbase + 69 a->r_offset - dataaddr), sizeof(w)); 70 break; 71 default: 72 printf("\nunhandled relocation type %u\n", 73 (u_int)ELF_R_TYPE(a->r_info)); 74 return (EFTYPE); 75 } 76 } 77 break; 78 } 79 80 return (0); 81#elif (defined(__i386__) || defined(__amd64__)) && __ELF_WORD_SIZE == 64 82 Elf64_Addr *where, val; 83 Elf_Addr addend, addr; 84 Elf_Size rtype, symidx; 85 const Elf_Rel *rel; 86 const Elf_Rela *rela; 87 88 switch (reltype) { 89 case ELF_RELOC_REL: 90 rel = (const Elf_Rel *)reldata; 91 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 92 dataaddr); 93 addend = 0; 94 rtype = ELF_R_TYPE(rel->r_info); 95 symidx = ELF_R_SYM(rel->r_info); 96 addend = 0; 97 break; 98 case ELF_RELOC_RELA: 99 rela = (const Elf_Rela *)reldata; 100 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 101 dataaddr); 102 addend = rela->r_addend; 103 rtype = ELF_R_TYPE(rela->r_info); 104 symidx = ELF_R_SYM(rela->r_info); 105 break; 106 default: 107 return (EINVAL); 108 } 109 110 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 111 return (0); 112 113 if (reltype == ELF_RELOC_REL) 114 addend = *where; 115 116/* XXX, definitions not available on i386. */ 117#define R_X86_64_64 1 118#define R_X86_64_RELATIVE 8 119 120 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 default: 134 printf("\nunhandled relocation type %u\n", (u_int)rtype); 135 return (EFTYPE); 136 } 137 138 return (0); 139#elif defined(__i386__) && __ELF_WORD_SIZE == 32 140 Elf_Addr addend, addr, *where, val; 141 Elf_Size rtype, symidx; 142 const Elf_Rel *rel; 143 const Elf_Rela *rela; 144 145 switch (reltype) { 146 case ELF_RELOC_REL: 147 rel = (const Elf_Rel *)reldata; 148 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset - 149 dataaddr); 150 addend = 0; 151 rtype = ELF_R_TYPE(rel->r_info); 152 symidx = ELF_R_SYM(rel->r_info); 153 addend = 0; 154 break; 155 case ELF_RELOC_RELA: 156 rela = (const Elf_Rela *)reldata; 157 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset - 158 dataaddr); 159 addend = rela->r_addend; 160 rtype = ELF_R_TYPE(rela->r_info); 161 symidx = ELF_R_SYM(rela->r_info); 162 break; 163 default: 164 return (EINVAL); 165 } 166 167 if ((char *)where < (char *)data || (char *)where >= (char *)data + len) 168 return (0); 169 170 if (reltype == ELF_RELOC_REL) 171 addend = *where; 172 173/* XXX, definitions not available on amd64. */ 174#define R_386_32 1 /* Add symbol value. */ 175#define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */ 176#define R_386_RELATIVE 8 /* Add load address of shared object. */ 177 178 switch (rtype) { 179 case R_386_RELATIVE: 180 addr = addend + relbase; 181 *where = addr; 182 break; 183 case R_386_32: /* S + A */ 184 addr = symaddr(ef, symidx); 185 if (addr == 0) 186 return (ESRCH); 187 val = addr + addend; 188 *where = val; 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__) 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 case R_PPC_RELATIVE: 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