1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 #if defined(_KERNEL) 27 #include <sys/types.h> 28 #include "reloc.h" 29 #else 30 #define ELF_TARGET_AMD64 31 #if defined(DO_RELOC_LIBLD) 32 #undef DO_RELOC_LIBLD 33 #define DO_RELOC_LIBLD_X86 34 #endif 35 #include <stdio.h> 36 #include "sgs.h" 37 #include "machdep.h" 38 #include "libld.h" 39 #include "reloc.h" 40 #include "conv.h" 41 #include "msg.h" 42 #endif 43 44 /* 45 * We need to build this code differently when it is used for 46 * cross linking: 47 * - Data alignment requirements can differ from those 48 * of the running system, so we can't access data 49 * in units larger than a byte 50 * - We have to include code to do byte swapping when the 51 * target and linker host use different byte ordering, 52 * but such code is a waste when running natively. 53 */ 54 #if !defined(DO_RELOC_LIBLD) || defined(__x86) 55 #define DORELOC_NATIVE 56 #endif 57 58 /* 59 * This table represents the current relocations that do_reloc() is able to 60 * process. The relocations below that are marked SPECIAL are relocations that 61 * take special processing and shouldn't actually ever be passed to do_reloc(). 62 */ 63 const Rel_entry reloc_table[R_AMD64_NUM] = { 64 /* R_AMD64_NONE */ {0, FLG_RE_NOTREL, 0, 0, 0}, 65 /* R_AMD64_64 */ {0, FLG_RE_NOTREL, 8, 0, 0}, 66 /* R_AMD64_PC32 */ {0, FLG_RE_PCREL, 4, 0, 0}, 67 /* R_AMD64_GOT32 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 68 /* R_AMD64_PLT32 */ {0, FLG_RE_PCREL | FLG_RE_PLTREL | 69 FLG_RE_VERIFY | FLG_RE_SIGN, 4, 0, 0}, 70 /* R_AMD64_COPY */ {0, FLG_RE_NOTSUP, 0, 0, 0}, /* SPECIAL */ 71 /* R_AMD64_GLOB_DAT */ {0, FLG_RE_NOTREL, 8, 0, 0}, 72 /* R_AMD64_JUMP_SLOT */ {0, FLG_RE_NOTSUP, 0, 0, 0}, /* SPECIAL */ 73 /* R_AMD64_RELATIVE */ {0, FLG_RE_NOTREL, 8, 0, 0}, 74 /* R_AMD64_GOTPCREL */ {0, FLG_RE_GOTPC | FLG_RE_GOTADD, 4, 0, 0}, 75 /* R_AMD64_32 */ {0, FLG_RE_NOTREL, 4, 0, 0}, 76 /* R_AMD64_32S */ {0, FLG_RE_NOTREL, 4, 0, 0}, 77 /* R_AMD64_16 */ {0, FLG_RE_NOTREL, 2, 0, 0}, 78 /* R_AMD64_PC16 */ {0, FLG_RE_PCREL, 2, 0, 0}, 79 /* R_AMD64_8 */ {0, FLG_RE_NOTREL, 1, 0, 0}, 80 /* R_AMD64_PC8 */ {0, FLG_RE_PCREL, 1, 0, 0}, 81 /* R_AMD64_DTPMOD64 */ {0, FLG_RE_NOTREL, 8, 0, 0}, 82 /* R_AMD64_DTPOFF64 */ {0, FLG_RE_NOTREL, 8, 0, 0}, 83 /* R_AMD64_TPOFF64 */ {0, FLG_RE_NOTREL, 8, 0, 0}, 84 /* R_AMD64_TLSGD */ {0, FLG_RE_GOTPC | FLG_RE_GOTADD | FLG_RE_TLSGD, 85 4, 0, 0}, 86 /* R_AMD64_TLSLD */ {0, FLG_RE_GOTPC | FLG_RE_GOTADD | FLG_RE_TLSLD, 87 4, 0, 0}, 88 /* R_AMD64_DTPOFF32 */ {0, FLG_RE_TLSLD, 4}, 89 /* R_AMD64_GOTTPOFF */ {0, FLG_RE_GOTPC | FLG_RE_GOTADD | FLG_RE_TLSIE, 90 4, 0, 0}, 91 /* R_AMD64_TPOFF32 */ {0, FLG_RE_TLSLE, 4, 0, 0}, 92 /* R_AMD64_PC64 */ {0, FLG_RE_PCREL, 8, 0, 0}, 93 /* R_AMD64_GOTOFF64 */ {0, FLG_RE_GOTREL, 8, 0, 0}, 94 /* R_AMD64_GOTPC32 */ {0, FLG_RE_PCREL | FLG_RE_GOTPC | FLG_RE_LOCLBND, 95 4, 0, 0}, 96 /* R_AMD64_GOT64 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 97 /* R_AMD64_GOTPCREL64 */ {FLG_RE_NOTSUP, 0, 0, 0}, 98 /* R_AMD64_GOTPC6 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 99 /* R_AMD64_GOTPLT64 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 100 /* R_AMD64_PLTOFF64 */ {0, FLG_RE_NOTSUP, 0, 0, 0}, 101 /* R_AMD64_SIZE32 */ {0, FLG_RE_SIZE, 4, 0, 0}, 102 /* R_AMD64_SIZE64 */ {0, FLG_RE_SIZE, 8, 0, 0} 103 }; 104 #if (R_AMD64_NUM != (R_AMD64_SIZE64 + 1)) 105 #error "R_AMD64_NUM has grown" 106 #endif 107 108 /* 109 * Write a single relocated value to its reference location. 110 * We assume we wish to add the relocation amount, value, to the 111 * value of the address already present at the offset. 112 * 113 * NAME VALUE FIELD CALCULATION 114 * 115 * R_AMD64_NONE 0 none none 116 * R_AMD64_64 1 word64 S + A 117 * R_AMD64_PC32 2 word64 S + A 118 * R_AMD64_GOT32 3 word32 G + A 119 * R_AMD64_PLT32 4 word32 L + A - P 120 * R_AMD64_COPY 5 none none 121 * R_AMD64_GLOB_DAT 6 word64 S 122 * R_AMD64_JUMP_SLOT 7 word64 S 123 * R_AMD64_RELATIVE 8 word64 B + A 124 * R_AMD64_GOTPCREL 9 word32 G + GOT + A - P 125 * R_AMD64_32 10 word32 S + A 126 * R_AMD64_32S 11 word32 S + A 127 * R_AMD64_16 12 word16 S + A 128 * R_AMD64_PC16 13 word16 S + A - P 129 * R_AMD64_8 14 word8 S + A 130 * R_AMD64_PC8 15 word8 S + A - P 131 * R_AMD64_DTPMOD64 16 word64 132 * R_AMD64_DTPOFF64 17 word64 133 * R_AMD64_TPOFF64 18 word64 134 * R_AMD64_TLSGD 19 word32 135 * R_AMD64_TLSLD 20 word32 136 * R_AMD64_DTPOFF32 21 word32 137 * R_AMD64_GOTTPOFF 22 word32 138 * R_AMD64_TPOFF32 23 word32 139 * R_AMD64_PC64 24 word32 S + A - P 140 * R_AMD64_GOTOFF64 25 word32 S + A - GOT 141 * R_AMD64_GOTPC32 26 word32 GOT + A - P 142 * R_AMD64_GOT64 27 reserved for future expansion 143 * R_AMD64_GOTPCREL64 28 reserved for future expansion 144 * R_AMD64_GOTPC64 29 reserved for future expansion 145 * R_AMD64_GOTPLT64 30 reserved for future expansion 146 * R_AMD64_PLTOFF64 31 reserved for future expansion 147 * R_AMD64_SIZE32 32 word32 Z + A 148 * R_AMD64_SIZE64 33 word64 Z + A 149 * 150 * Relocation calculations: 151 * A Represents the addend used to compute the value of the 152 * relocatable field. 153 * 154 * B Represents the base address at which a shared objects has 155 * been loaded into memory during executaion. Generally, a 156 * shared objects is built with a 0 base virtual address, 157 * but the execution address will be different. 158 * 159 * G Represents the offset into the global offset table 160 * at which the relocation entry's symbol will reside 161 * during execution. 162 * 163 * GOT Rrepresents the address of the global offset table. 164 * 165 * L Represents the place (section offset or address) of 166 * the Procedure Linkage Table entry for a symbol. 167 * 168 * P Represents the place (section offset or address) of the 169 * storage unit being relocated (computed using r_offset). 170 * 171 * S Represents the value of the symbol whose index resides 172 * in the relocation entry. 173 * 174 * Z the size of the symbol whose index resides in the relocation 175 * entry 176 */ 177 178 179 /* 180 * Bits that must be cleared or identical for a value to act as if extended in 181 * the given way. 182 */ 183 #define ZEROEXBITS 0xffffffff00000000ULL 184 #define SIGNEXBITS 0xffffffff80000000ULL 185 186 /* BEGIN CSTYLED */ 187 #if defined(_KERNEL) 188 #define lml 0 /* Needed by arglist of REL_ERR_* macros */ 189 int 190 do_reloc_krtld(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 191 const char *file) 192 #elif defined(DO_RELOC_LIBLD) 193 /*ARGSUSED5*/ 194 int 195 do_reloc_ld(Rel_desc *rdesc, uchar_t *off, Xword *value, 196 rel_desc_sname_func_t rel_desc_sname_func, 197 const char *file, int bswap, void *lml) 198 #else 199 int 200 do_reloc_rtld(uchar_t rtype, uchar_t *off, Xword *value, const char *sym, 201 const char *file, void *lml) 202 #endif 203 { 204 /* END CSTYLED */ 205 #ifdef DO_RELOC_LIBLD 206 #define sym (* rel_desc_sname_func)(rdesc) 207 uchar_t rtype = rdesc->rel_rtype; 208 #endif 209 const Rel_entry *rep; 210 211 rep = &reloc_table[rtype]; 212 213 switch (rep->re_fsize) { 214 case 1: 215 /* LINTED */ 216 *((uchar_t *)off) = (uchar_t)(*value); 217 break; 218 219 case 2: 220 #if defined(DORELOC_NATIVE) 221 /* LINTED */ 222 *((Half *)off) = (Half)(*value); 223 #else 224 { 225 Half v = (Half)(*value); 226 uchar_t *v_bytes = (uchar_t *)&v; 227 228 if (bswap) { 229 UL_ASSIGN_BSWAP_HALF(off, v_bytes); 230 } else { 231 UL_ASSIGN_HALF(off, v_bytes); 232 } 233 } 234 #endif 235 break; 236 237 case 4: 238 /* 239 * The amd64 psABI requires that we perform the following 240 * verifications: 241 * 242 * The R_AMD64_32 and R_AMD64_32S relocations truncate the 243 * computed value to 32bits. Verify that the generated value 244 * for the R_AMD64_32/32S relocation zero-extends (sign 245 * extends) to the original 64-bit value. 246 * 247 * Also, the following relocations are all 32 bit PC relative 248 * references. Validate that the value being written will fit 249 * in the field provided. 250 * 251 * R_AMD64_PC32, R_AMD64_GOTPC32, R_AMD64_GOTPCREL 252 */ 253 if (rtype == R_AMD64_32) { 254 /* 255 * Verify that this value will act as a zero-extended 256 * unsigned 32 bit value. That is, that the upper 257 * 32 bits are zero. 258 */ 259 if ((*value & ZEROEXBITS) != 0) { 260 /* 261 * To keep chkmsg() happy: 262 * MSG_INTL(MSG_REL_NOFIT) 263 */ 264 REL_ERR_NOFIT(lml, file, sym, rtype, *value); 265 return (0); 266 } 267 } else if ((rtype == R_AMD64_32S) || (rtype == R_AMD64_PC32) || 268 (rtype == R_AMD64_GOTPCREL) || (rtype == R_AMD64_GOTPC32)) { 269 /* 270 * Verify that this value will act as a sign-extended 271 * signed 32 bit value, that is that the upper 33 bits 272 * are either all zero or all one. 273 */ 274 if (((*value & SIGNEXBITS) != SIGNEXBITS) && 275 ((*value & SIGNEXBITS) != 0)) { 276 /* 277 * To keep chkmsg() happy: 278 * MSG_INTL(MSG_REL_NOFIT) 279 */ 280 REL_ERR_NOFIT(lml, file, sym, rtype, *value); 281 return (0); 282 } 283 } 284 285 #if defined(DORELOC_NATIVE) 286 /* LINTED */ 287 *((Word *)off) += *value; 288 #else 289 { 290 Word v; 291 uchar_t *v_bytes = (uchar_t *)&v; 292 293 if (bswap) { 294 UL_ASSIGN_BSWAP_WORD(v_bytes, off); 295 v += *value; 296 UL_ASSIGN_BSWAP_WORD(off, v_bytes); 297 } else { 298 UL_ASSIGN_WORD(v_bytes, off); 299 v += *value; 300 UL_ASSIGN_WORD(off, v_bytes); 301 } 302 } 303 #endif 304 break; 305 306 case 8: 307 #if defined(DORELOC_NATIVE) 308 /* LINTED */ 309 *((Xword *)off) += *value; 310 #else 311 { 312 Xword v; 313 uchar_t *v_bytes = (uchar_t *)&v; 314 315 if (bswap) { 316 UL_ASSIGN_BSWAP_XWORD(v_bytes, off); 317 v += *value; 318 UL_ASSIGN_BSWAP_XWORD(off, v_bytes); 319 } else { 320 UL_ASSIGN_XWORD(v_bytes, off); 321 v += *value; 322 UL_ASSIGN_XWORD(off, v_bytes); 323 } 324 } 325 #endif 326 break; 327 default: 328 /* 329 * To keep chkmsg() happy: MSG_INTL(MSG_REL_UNSUPSZ) 330 */ 331 REL_ERR_UNSUPSZ(lml, file, sym, rtype, rep->re_fsize); 332 return (0); 333 } 334 return (1); 335 336 #ifdef DO_RELOC_LIBLD 337 #undef sym 338 #endif 339 } 340