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) 1990, 1991 UNIX System Laboratories, Inc. 24 * Copyright (c) 1988 AT&T 25 * All Rights Reserved 26 * 27 * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved. 28 */ 29 30 /* Get the x86 version of the relocation engine */ 31 #define DO_RELOC_LIBLD_X86 32 33 #include <string.h> 34 #include <stdio.h> 35 #include <sys/elf_386.h> 36 #include <debug.h> 37 #include <reloc.h> 38 #include <i386/machdep_x86.h> 39 #include "msg.h" 40 #include "_libld.h" 41 42 /* 43 * Search the GOT index list for a GOT entry with a matching reference. 44 */ 45 /* ARGSUSED3 */ 46 static Gotndx * 47 ld_find_got_ndx(Alist *alp, Gotref gref, Ofl_desc *ofl, Rel_desc *rdesc) 48 { 49 Aliste idx; 50 Gotndx *gnp; 51 52 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 53 return (ofl->ofl_tlsldgotndx); 54 55 for (ALIST_TRAVERSE(alp, idx, gnp)) { 56 if (gnp->gn_gotref == gref) 57 return (gnp); 58 } 59 return (NULL); 60 } 61 62 static Xword 63 ld_calc_got_offset(Rel_desc *rdesc, Ofl_desc *ofl) 64 { 65 Os_desc *osp = ofl->ofl_osgot; 66 Sym_desc *sdp = rdesc->rel_sym; 67 Xword gotndx; 68 Gotref gref; 69 Gotndx *gnp; 70 71 if (rdesc->rel_flags & FLG_REL_DTLS) 72 gref = GOT_REF_TLSGD; 73 else if (rdesc->rel_flags & FLG_REL_MTLS) 74 gref = GOT_REF_TLSLD; 75 else if (rdesc->rel_flags & FLG_REL_STLS) 76 gref = GOT_REF_TLSIE; 77 else 78 gref = GOT_REF_GENERIC; 79 80 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL); 81 assert(gnp); 82 83 gotndx = (Xword)gnp->gn_gotndx; 84 85 if ((rdesc->rel_flags & FLG_REL_DTLS) && 86 (rdesc->rel_rtype == R_386_TLS_DTPOFF32)) 87 gotndx++; 88 89 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE))); 90 } 91 92 static Word 93 ld_init_rel(Rel_desc *reld, Word *typedata, void *reloc) 94 { 95 Rel *rel = (Rel *)reloc; 96 97 /* LINTED */ 98 reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info, M_MACH); 99 reld->rel_roffset = rel->r_offset; 100 reld->rel_raddend = 0; 101 *typedata = 0; 102 103 return ((Word)ELF_R_SYM(rel->r_info)); 104 } 105 106 static void 107 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl) 108 { 109 ofl->ofl_dehdr->e_flags |= ehdr->e_flags; 110 } 111 112 static void 113 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt) 114 { 115 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) { 116 /* 117 * Create this entry if we are going to create a PLT table. 118 */ 119 if (ofl->ofl_pltcnt) 120 (*cnt)++; /* DT_PLTGOT */ 121 } 122 } 123 124 static void 125 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn) 126 { 127 if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) { 128 (*dyn)->d_tag = DT_PLTGOT; 129 if (ofl->ofl_osgot) 130 (*dyn)->d_un.d_ptr = ofl->ofl_osgot->os_shdr->sh_addr; 131 else 132 (*dyn)->d_un.d_ptr = 0; 133 (*dyn)++; 134 } 135 } 136 137 static Xword 138 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 139 { 140 Xword value; 141 142 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 143 M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * M_PLT_ENTSIZE); 144 return (value); 145 } 146 147 /* 148 * Build a single plt entry - code is: 149 * if (building a.out) 150 * JMP *got_off 151 * else 152 * JMP *got_off@GOT(%ebx) 153 * PUSHL &rel_off 154 * JMP -n(%pc) # -n is pcrel offset to first plt entry 155 * 156 * The got_off@GOT entry gets filled with the address of the PUSHL, 157 * so the first pass through the plt jumps back here, jumping 158 * in turn to the first plt entry, which jumps to the dynamic 159 * linker. The dynamic linker then patches the GOT, rerouting 160 * future plt calls to the proper destination. 161 */ 162 static void 163 plt_entry(Ofl_desc * ofl, Word rel_off, Sym_desc * sdp) 164 { 165 uchar_t *pltent, *gotent; 166 Sword plt_off; 167 Word got_off; 168 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 169 170 got_off = sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE; 171 plt_off = M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * 172 M_PLT_ENTSIZE); 173 pltent = (uchar_t *)(ofl->ofl_osplt->os_outdata->d_buf) + plt_off; 174 gotent = (uchar_t *)(ofl->ofl_osgot->os_outdata->d_buf) + got_off; 175 176 /* 177 * Fill in the got entry with the address of the next instruction. 178 */ 179 /* LINTED */ 180 *(Word *)gotent = ofl->ofl_osplt->os_shdr->sh_addr + plt_off + 181 M_PLT_INSSIZE; 182 if (bswap) 183 /* LINTED */ 184 *(Word *)gotent = ld_bswap_Word(*(Word *)gotent); 185 186 if (!(ofl->ofl_flags & FLG_OF_SHAROBJ)) { 187 pltent[0] = M_SPECIAL_INST; 188 pltent[1] = M_JMP_DISP_IND; 189 pltent += 2; 190 /* LINTED */ 191 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->sh_addr + 192 got_off); 193 } else { 194 pltent[0] = M_SPECIAL_INST; 195 pltent[1] = M_JMP_REG_DISP_IND; 196 pltent += 2; 197 /* LINTED */ 198 *(Word *)pltent = (Word)got_off; 199 } 200 if (bswap) 201 /* LINTED */ 202 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 203 pltent += 4; 204 205 pltent[0] = M_INST_PUSHL; 206 pltent++; 207 /* LINTED */ 208 *(Word *)pltent = (Word)rel_off; 209 if (bswap) 210 /* LINTED */ 211 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 212 pltent += 4; 213 214 plt_off = -(plt_off + 16); /* JMP, PUSHL, JMP take 16 bytes */ 215 pltent[0] = M_INST_JMP; 216 pltent++; 217 /* LINTED */ 218 *(Word *)pltent = (Word)plt_off; 219 if (bswap) 220 /* LINTED */ 221 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 222 } 223 224 static uintptr_t 225 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl) 226 { 227 Os_desc * relosp, * osp = 0; 228 Word ndx, roffset, value; 229 Rel rea; 230 char *relbits; 231 Sym_desc * sdp, * psym = (Sym_desc *)0; 232 int sectmoved = 0; 233 234 sdp = orsp->rel_sym; 235 236 /* 237 * If the section this relocation is against has been discarded 238 * (-zignore), then also discard (skip) the relocation itself. 239 */ 240 if (orsp->rel_isdesc && ((orsp->rel_flags & 241 (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) && 242 (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) { 243 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp)); 244 return (1); 245 } 246 247 /* 248 * If this is a relocation against a move table, or expanded move 249 * table, adjust the relocation entries. 250 */ 251 if (RELAUX_GET_MOVE(orsp)) 252 ld_adj_movereloc(ofl, orsp); 253 254 /* 255 * If this is a relocation against a section using a partial initialized 256 * symbol, adjust the embedded symbol info. 257 * 258 * The second argument of the am_I_partial() is the value stored at the 259 * target address relocation is going to be applied. 260 */ 261 if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) { 262 if (ofl->ofl_parsyms && 263 (sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 264 /* LINTED */ 265 (psym = ld_am_I_partial(orsp, *(Xword *) 266 ((uchar_t *)(orsp->rel_isdesc->is_indata->d_buf) + 267 orsp->rel_roffset)))) { 268 DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym)); 269 sectmoved = 1; 270 } 271 } 272 273 value = sdp->sd_sym->st_value; 274 275 if (orsp->rel_flags & FLG_REL_GOT) { 276 osp = ofl->ofl_osgot; 277 roffset = (Word)ld_calc_got_offset(orsp, ofl); 278 279 } else if (orsp->rel_flags & FLG_REL_PLT) { 280 /* 281 * Note that relocations for PLT's actually 282 * cause a relocation againt the GOT. 283 */ 284 osp = ofl->ofl_osplt; 285 roffset = (Word) (ofl->ofl_osgot->os_shdr->sh_addr) + 286 sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE; 287 288 plt_entry(ofl, osp->os_relosdesc->os_szoutrels, sdp); 289 290 } else if (orsp->rel_flags & FLG_REL_BSS) { 291 /* 292 * This must be a R_386_COPY. For these set the roffset to 293 * point to the new symbols location. 294 */ 295 osp = ofl->ofl_isbss->is_osdesc; 296 roffset = (Word)value; 297 } else { 298 osp = RELAUX_GET_OSDESC(orsp); 299 300 /* 301 * Calculate virtual offset of reference point; equals offset 302 * into section + vaddr of section for loadable sections, or 303 * offset plus section displacement for nonloadable sections. 304 */ 305 roffset = orsp->rel_roffset + 306 (Off)_elf_getxoff(orsp->rel_isdesc->is_indata); 307 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) 308 roffset += orsp->rel_isdesc->is_osdesc-> 309 os_shdr->sh_addr; 310 } 311 312 if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0)) 313 relosp = ofl->ofl_osrel; 314 315 /* 316 * Assign the symbols index for the output relocation. If the 317 * relocation refers to a SECTION symbol then it's index is based upon 318 * the output sections symbols index. Otherwise the index can be 319 * derived from the symbols index itself. 320 */ 321 if (orsp->rel_rtype == R_386_RELATIVE) 322 ndx = STN_UNDEF; 323 else if ((orsp->rel_flags & FLG_REL_SCNNDX) || 324 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) { 325 if (sectmoved == 0) { 326 /* 327 * Check for a null input section. This can 328 * occur if this relocation references a symbol 329 * generated by sym_add_sym(). 330 */ 331 if (sdp->sd_isc && sdp->sd_isc->is_osdesc) 332 ndx = sdp->sd_isc->is_osdesc->os_identndx; 333 else 334 ndx = sdp->sd_shndx; 335 } else 336 ndx = ofl->ofl_parexpnndx; 337 } else 338 ndx = sdp->sd_symndx; 339 340 /* 341 * If we have a replacement value for the relocation 342 * target, put it in place now. 343 */ 344 if (orsp->rel_flags & FLG_REL_NADDEND) { 345 Xword addend = orsp->rel_raddend; 346 uchar_t *addr; 347 348 /* 349 * Get the address of the data item we need to modify. 350 */ 351 addr = (uchar_t *)((uintptr_t)orsp->rel_roffset + 352 (uintptr_t)_elf_getxoff(orsp->rel_isdesc->is_indata)); 353 addr += (uintptr_t)RELAUX_GET_OSDESC(orsp)->os_outdata->d_buf; 354 if (ld_reloc_targval_set(ofl, orsp, addr, addend) == 0) 355 return (S_ERROR); 356 } 357 358 relbits = (char *)relosp->os_outdata->d_buf; 359 360 rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype); 361 rea.r_offset = roffset; 362 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_REL, &rea, relosp->os_name, 363 ld_reloc_sym_name(orsp))); 364 365 /* 366 * Assert we haven't walked off the end of our relocation table. 367 */ 368 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 369 370 (void) memcpy((relbits + relosp->os_szoutrels), 371 (char *)&rea, sizeof (Rel)); 372 relosp->os_szoutrels += sizeof (Rel); 373 374 /* 375 * Determine if this relocation is against a non-writable, allocatable 376 * section. If so we may need to provide a text relocation diagnostic. 377 * Note that relocations against the .plt (R_386_JMP_SLOT) actually 378 * result in modifications to the .got. 379 */ 380 if (orsp->rel_rtype == R_386_JMP_SLOT) 381 osp = ofl->ofl_osgot; 382 383 ld_reloc_remain_entry(orsp, osp, ofl); 384 return (1); 385 } 386 387 /* 388 * i386 Instructions for TLS processing 389 */ 390 static uchar_t tlsinstr_gd_ie[] = { 391 /* 392 * 0x00 movl %gs:0x0, %eax 393 */ 394 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, 395 /* 396 * 0x06 addl x(%eax), %eax 397 * 0x0c ... 398 */ 399 0x03, 0x80, 0x00, 0x00, 0x00, 0x00 400 }; 401 402 static uchar_t tlsinstr_gd_le[] = { 403 /* 404 * 0x00 movl %gs:0x0, %eax 405 */ 406 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, 407 /* 408 * 0x06 addl $0x0, %eax 409 */ 410 0x05, 0x00, 0x00, 0x00, 0x00, 411 /* 412 * 0x0b nop 413 * 0x0c 414 */ 415 0x90 416 }; 417 418 static uchar_t tlsinstr_gd_ie_movgs[] = { 419 /* 420 * movl %gs:0x0,%eax 421 */ 422 0x65, 0xa1, 0x00, 0x00, 0x00, 00 423 }; 424 425 #define TLS_GD_IE_MOV 0x8b /* movl opcode */ 426 #define TLS_GD_IE_POP 0x58 /* popl + reg */ 427 428 #define TLS_GD_LE_MOVL 0xb8 /* movl + reg */ 429 430 #define TLS_NOP 0x90 /* NOP instruction */ 431 432 #define MODRM_MSK_MOD 0xc0 433 #define MODRM_MSK_RO 0x38 434 #define MODRM_MSK_RM 0x07 435 436 #define SIB_MSK_SS 0xc0 437 #define SIB_MSK_IND 0x38 438 #define SIB_MSK_BS 0x07 439 440 static Fixupret 441 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp) 442 { 443 Sym_desc *sdp = arsp->rel_sym; 444 Word rtype = arsp->rel_rtype; 445 uchar_t *offset, r1, r2; 446 447 offset = (uchar_t *)((uintptr_t)arsp->rel_roffset + 448 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) + 449 (uintptr_t)RELAUX_GET_OSDESC(arsp)->os_outdata->d_buf); 450 451 if (sdp->sd_ref == REF_DYN_NEED) { 452 /* 453 * IE reference model 454 */ 455 switch (rtype) { 456 case R_386_TLS_GD: 457 /* 458 * Transition: 459 * 0x0 leal x@tlsgd(,r1,1), %eax 460 * 0x7 call ___tls_get_addr 461 * 0xc 462 * To: 463 * 0x0 movl %gs:0, %eax 464 * 0x6 addl x@gotntpoff(r1), %eax 465 */ 466 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 467 R_386_TLS_GOTIE, arsp, ld_reloc_sym_name)); 468 arsp->rel_rtype = R_386_TLS_GOTIE; 469 arsp->rel_roffset += 5; 470 471 /* 472 * Adjust 'offset' to beginning of instruction 473 * sequence. 474 */ 475 offset -= 3; 476 r1 = (offset[2] & SIB_MSK_IND) >> 3; 477 (void) memcpy(offset, tlsinstr_gd_ie, 478 sizeof (tlsinstr_gd_ie)); 479 480 /* 481 * set register %r1 into the addl 482 * instruction. 483 */ 484 offset[0x7] |= r1; 485 return (FIX_RELOC); 486 487 case R_386_TLS_GD_PLT: 488 /* 489 * Fixup done via the TLS_GD relocation 490 */ 491 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 492 R_386_NONE, arsp, ld_reloc_sym_name)); 493 return (FIX_DONE); 494 } 495 } 496 497 /* 498 * LE reference model 499 */ 500 switch (rtype) { 501 case R_386_TLS_GD: 502 /* 503 * Transition: 504 * 0x0 leal x@tlsgd(,r1,1), %eax 505 * 0x7 call ___tls_get_addr 506 * 0xc 507 * To: 508 * 0x0 movl %gs:0, %eax 509 * 0x6 addl $x@ntpoff, %eax 510 * 0xb nop 511 * 0xc 512 */ 513 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 514 R_386_TLS_LE, arsp, ld_reloc_sym_name)); 515 516 arsp->rel_rtype = R_386_TLS_LE; 517 arsp->rel_roffset += 4; 518 519 /* 520 * Adjust 'offset' to beginning of instruction 521 * sequence. 522 */ 523 offset -= 3; 524 (void) memcpy(offset, tlsinstr_gd_le, 525 sizeof (tlsinstr_gd_le)); 526 return (FIX_RELOC); 527 528 case R_386_TLS_GD_PLT: 529 case R_386_PLT32: 530 /* 531 * Fixup done via the TLS_GD relocation 532 */ 533 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 534 R_386_NONE, arsp, ld_reloc_sym_name)); 535 return (FIX_DONE); 536 537 case R_386_TLS_LDM_PLT: 538 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 539 R_386_NONE, arsp, ld_reloc_sym_name)); 540 541 /* 542 * Transition: 543 * call __tls_get_addr() 544 * to: 545 * nop 546 * nop 547 * nop 548 * nop 549 * nop 550 */ 551 *(offset - 1) = TLS_NOP; 552 *(offset) = TLS_NOP; 553 *(offset + 1) = TLS_NOP; 554 *(offset + 2) = TLS_NOP; 555 *(offset + 3) = TLS_NOP; 556 return (FIX_DONE); 557 558 case R_386_TLS_LDM: 559 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 560 R_386_NONE, arsp, ld_reloc_sym_name)); 561 562 /* 563 * Transition: 564 * 565 * 0x00 leal x1@tlsldm(%ebx), %eax 566 * 0x06 call ___tls_get_addr 567 * 568 * to: 569 * 570 * 0x00 movl %gs:0, %eax 571 */ 572 (void) memcpy(offset - 2, tlsinstr_gd_ie_movgs, 573 sizeof (tlsinstr_gd_ie_movgs)); 574 return (FIX_DONE); 575 576 case R_386_TLS_LDO_32: 577 /* 578 * Instructions: 579 * 580 * 0x10 leal x1@dtpoff(%eax), %edx R_386_TLS_LDO_32 581 * to 582 * 0x10 leal x1@ntpoff(%eax), %edx R_386_TLS_LE 583 * 584 */ 585 offset -= 2; 586 587 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 588 R_386_TLS_LE, arsp, ld_reloc_sym_name)); 589 arsp->rel_rtype = R_386_TLS_LE; 590 return (FIX_RELOC); 591 592 case R_386_TLS_GOTIE: 593 /* 594 * These transitions are a little different than the 595 * others, in that we could have multiple instructions 596 * pointed to by a single relocation. Depending upon the 597 * instruction, we perform a different code transition. 598 * 599 * Here's the known transitions: 600 * 601 * 1) movl foo@gotntpoff(%reg1), %reg2 602 * 0x8b, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 603 * 604 * 2) addl foo@gotntpoff(%reg1), %reg2 605 * 0x03, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 606 * 607 * Transitions IE -> LE 608 * 609 * 1) movl $foo@ntpoff, %reg2 610 * 0xc7, 0xc0 | reg2, foo@ntpoff 611 * 612 * 2) addl $foo@ntpoff, %reg2 613 * 0x81, 0xc0 | reg2, foo@ntpoff 614 * 615 * Note: reg1 != 4 (%esp) 616 */ 617 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 618 R_386_TLS_LE, arsp, ld_reloc_sym_name)); 619 arsp->rel_rtype = R_386_TLS_LE; 620 621 offset -= 2; 622 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 623 if (offset[0] == 0x8b) { 624 /* case 1 above */ 625 offset[0] = 0xc7; /* movl */ 626 offset[1] = 0xc0 | r2; 627 return (FIX_RELOC); 628 } 629 630 if (offset[0] == 0x03) { 631 /* case 2 above */ 632 assert(offset[0] == 0x03); 633 offset[0] = 0x81; /* addl */ 634 offset[1] = 0xc0 | r2; 635 return (FIX_RELOC); 636 } 637 638 /* 639 * Unexpected instruction sequence - fatal error. 640 */ 641 { 642 Conv_inv_buf_t inv_buf; 643 644 eprintf(ofl->ofl_lml, ERR_FATAL, 645 MSG_INTL(MSG_REL_BADTLSINS), 646 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 647 arsp->rel_isdesc->is_file->ifl_name, 648 ld_reloc_sym_name(arsp), 649 arsp->rel_isdesc->is_name, 650 EC_OFF(arsp->rel_roffset)); 651 } 652 return (FIX_ERROR); 653 654 case R_386_TLS_IE: 655 /* 656 * These transitions are a little different than the 657 * others, in that we could have multiple instructions 658 * pointed to by a single relocation. Depending upon the 659 * instruction, we perform a different code transition. 660 * 661 * Here's the known transitions: 662 * 1) movl foo@indntpoff, %eax 663 * 0xa1, foo@indntpoff 664 * 665 * 2) movl foo@indntpoff, %eax 666 * 0x8b, 0x05 | (reg << 3), foo@gotntpoff 667 * 668 * 3) addl foo@indntpoff, %eax 669 * 0x03, 0x05 | (reg << 3), foo@gotntpoff 670 * 671 * Transitions IE -> LE 672 * 673 * 1) movl $foo@ntpoff, %eax 674 * 0xb8, foo@ntpoff 675 * 676 * 2) movl $foo@ntpoff, %reg 677 * 0xc7, 0xc0 | reg, foo@ntpoff 678 * 679 * 3) addl $foo@ntpoff, %reg 680 * 0x81, 0xc0 | reg, foo@ntpoff 681 */ 682 arsp->rel_rtype = R_386_TLS_LE; 683 offset--; 684 if (offset[0] == 0xa1) { 685 /* case 1 above */ 686 offset[0] = 0xb8; /* movl */ 687 return (FIX_RELOC); 688 } 689 690 offset--; 691 if (offset[0] == 0x8b) { 692 /* case 2 above */ 693 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 694 offset[0] = 0xc7; /* movl */ 695 offset[1] = 0xc0 | r2; 696 return (FIX_RELOC); 697 } 698 if (offset[0] == 0x03) { 699 /* case 3 above */ 700 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 701 offset[0] = 0x81; /* addl */ 702 offset[1] = 0xc0 | r2; 703 return (FIX_RELOC); 704 } 705 /* 706 * Unexpected instruction sequence - fatal error. 707 */ 708 { 709 Conv_inv_buf_t inv_buf; 710 711 eprintf(ofl->ofl_lml, ERR_FATAL, 712 MSG_INTL(MSG_REL_BADTLSINS), 713 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 714 arsp->rel_isdesc->is_file->ifl_name, 715 ld_reloc_sym_name(arsp), 716 arsp->rel_isdesc->is_name, 717 EC_OFF(arsp->rel_roffset)); 718 } 719 return (FIX_ERROR); 720 } 721 return (FIX_RELOC); 722 } 723 724 static uintptr_t 725 ld_do_activerelocs(Ofl_desc *ofl) 726 { 727 Rel_desc *arsp; 728 Rel_cachebuf *rcbp; 729 Aliste idx; 730 uintptr_t return_code = 1; 731 ofl_flag_t flags = ofl->ofl_flags; 732 733 if (aplist_nitems(ofl->ofl_actrels.rc_list) != 0) 734 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 735 736 /* 737 * Process active relocations. 738 */ 739 REL_CACHE_TRAVERSE(&ofl->ofl_actrels, idx, rcbp, arsp) { 740 uchar_t *addr; 741 Xword value; 742 Sym_desc *sdp; 743 const char *ifl_name; 744 Xword refaddr; 745 int moved = 0; 746 Gotref gref; 747 Os_desc *osp; 748 749 /* 750 * If the section this relocation is against has been discarded 751 * (-zignore), then discard (skip) the relocation itself. 752 */ 753 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 754 ((arsp->rel_flags & (FLG_REL_GOT | FLG_REL_BSS | 755 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 756 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, arsp)); 757 continue; 758 } 759 760 /* 761 * We determine what the 'got reference' model (if required) 762 * is at this point. This needs to be done before tls_fixup() 763 * since it may 'transition' our instructions. 764 * 765 * The got table entries have already been assigned, 766 * and we bind to those initial entries. 767 */ 768 if (arsp->rel_flags & FLG_REL_DTLS) 769 gref = GOT_REF_TLSGD; 770 else if (arsp->rel_flags & FLG_REL_MTLS) 771 gref = GOT_REF_TLSLD; 772 else if (arsp->rel_flags & FLG_REL_STLS) 773 gref = GOT_REF_TLSIE; 774 else 775 gref = GOT_REF_GENERIC; 776 777 /* 778 * Perform any required TLS fixups. 779 */ 780 if (arsp->rel_flags & FLG_REL_TLSFIX) { 781 Fixupret ret; 782 783 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 784 return (S_ERROR); 785 if (ret == FIX_DONE) 786 continue; 787 } 788 789 /* 790 * If this is a relocation against a move table, or 791 * expanded move table, adjust the relocation entries. 792 */ 793 if (RELAUX_GET_MOVE(arsp)) 794 ld_adj_movereloc(ofl, arsp); 795 796 sdp = arsp->rel_sym; 797 refaddr = arsp->rel_roffset + 798 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 799 800 if (arsp->rel_flags & FLG_REL_CLVAL) 801 value = 0; 802 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) { 803 /* 804 * The value for a symbol pointing to a SECTION 805 * is based off of that sections position. 806 */ 807 if (sdp->sd_isc->is_flags & FLG_IS_RELUPD) { 808 Sym_desc *sym; 809 Xword radd; 810 uchar_t *raddr = (uchar_t *) 811 arsp->rel_isdesc->is_indata->d_buf + 812 arsp->rel_roffset; 813 814 /* 815 * This is a REL platform. Hence, the second 816 * argument of ld_am_I_partial() is the value 817 * stored at the target address where the 818 * relocation is going to be applied. 819 */ 820 if (ld_reloc_targval_get(ofl, arsp, raddr, 821 &radd) == 0) 822 return (S_ERROR); 823 sym = ld_am_I_partial(arsp, radd); 824 if (sym) { 825 Sym *osym = sym->sd_osym; 826 827 /* 828 * The symbol was moved, so adjust the 829 * value relative to the new section. 830 */ 831 value = sym->sd_sym->st_value; 832 moved = 1; 833 834 /* 835 * The original raddend covers the 836 * displacement from the section start 837 * to the desired address. The value 838 * computed above gets us from the 839 * section start to the start of the 840 * symbol range. Adjust the old raddend 841 * to remove the offset from section 842 * start to symbol start, leaving the 843 * displacement within the range of 844 * the symbol. 845 */ 846 if (osym->st_value != 0) { 847 radd -= osym->st_value; 848 if (ld_reloc_targval_set(ofl, 849 arsp, raddr, radd) == 0) 850 return (S_ERROR); 851 } 852 } 853 } 854 if (!moved) { 855 value = _elf_getxoff(sdp->sd_isc->is_indata); 856 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 857 value += sdp->sd_isc-> 858 is_osdesc->os_shdr->sh_addr; 859 } 860 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 861 value -= ofl->ofl_tlsphdr->p_vaddr; 862 863 } else if (IS_SIZE(arsp->rel_rtype)) { 864 /* 865 * Size relocations require the symbols size. 866 */ 867 value = sdp->sd_sym->st_size; 868 869 } else if ((sdp->sd_flags & FLG_SY_CAP) && 870 sdp->sd_aux && sdp->sd_aux->sa_PLTndx) { 871 /* 872 * If relocation is against a capabilities symbol, we 873 * need to jump to an associated PLT, so that at runtime 874 * ld.so.1 is involved to determine the best binding 875 * choice. Otherwise, the value is the symbols value. 876 */ 877 value = ld_calc_plt_addr(sdp, ofl); 878 879 } else 880 value = sdp->sd_sym->st_value; 881 882 /* 883 * Relocation against the GLOBAL_OFFSET_TABLE. 884 */ 885 if ((arsp->rel_flags & FLG_REL_GOT) && 886 !ld_reloc_set_aux_osdesc(ofl, arsp, ofl->ofl_osgot)) 887 return (S_ERROR); 888 osp = RELAUX_GET_OSDESC(arsp); 889 890 /* 891 * If loadable and not producing a relocatable object add the 892 * sections virtual address to the reference address. 893 */ 894 if ((arsp->rel_flags & FLG_REL_LOAD) && 895 ((flags & FLG_OF_RELOBJ) == 0)) 896 refaddr += 897 arsp->rel_isdesc->is_osdesc->os_shdr->sh_addr; 898 899 /* 900 * If this entry has a PLT assigned to it, its value is actually 901 * the address of the PLT (and not the address of the function). 902 */ 903 if (IS_PLT(arsp->rel_rtype)) { 904 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 905 value = ld_calc_plt_addr(sdp, ofl); 906 } 907 908 /* 909 * Determine whether the value needs further adjustment. Filter 910 * through the attributes of the relocation to determine what 911 * adjustment is required. Note, many of the following cases 912 * are only applicable when a .got is present. As a .got is 913 * not generated when a relocatable object is being built, 914 * any adjustments that require a .got need to be skipped. 915 */ 916 if ((arsp->rel_flags & FLG_REL_GOT) && 917 ((flags & FLG_OF_RELOBJ) == 0)) { 918 Xword R1addr; 919 uintptr_t R2addr; 920 Word gotndx; 921 Gotndx *gnp; 922 923 /* 924 * Perform relocation against GOT table. Since this 925 * doesn't fit exactly into a relocation we place the 926 * appropriate byte in the GOT directly 927 * 928 * Calculate offset into GOT at which to apply 929 * the relocation. 930 */ 931 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL); 932 assert(gnp); 933 934 if (arsp->rel_rtype == R_386_TLS_DTPOFF32) 935 gotndx = gnp->gn_gotndx + 1; 936 else 937 gotndx = gnp->gn_gotndx; 938 939 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE); 940 941 /* 942 * Add the GOTs data's offset. 943 */ 944 R2addr = R1addr + (uintptr_t)osp->os_outdata->d_buf; 945 946 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT, 947 M_MACH, SHT_REL, arsp, R1addr, value, 948 ld_reloc_sym_name)); 949 950 /* 951 * And do it. 952 */ 953 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 954 *(Xword *)R2addr = ld_bswap_Xword(value); 955 else 956 *(Xword *)R2addr = value; 957 continue; 958 959 } else if (IS_GOT_BASED(arsp->rel_rtype) && 960 ((flags & FLG_OF_RELOBJ) == 0)) { 961 value -= ofl->ofl_osgot->os_shdr->sh_addr; 962 963 } else if (IS_GOT_PC(arsp->rel_rtype) && 964 ((flags & FLG_OF_RELOBJ) == 0)) { 965 value = (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) - 966 refaddr; 967 968 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) && 969 (((flags & FLG_OF_RELOBJ) == 0) || 970 (osp == sdp->sd_isc->is_osdesc))) { 971 value -= refaddr; 972 973 } else if (IS_TLS_INS(arsp->rel_rtype) && 974 IS_GOT_RELATIVE(arsp->rel_rtype) && 975 ((flags & FLG_OF_RELOBJ) == 0)) { 976 Gotndx *gnp; 977 978 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL); 979 assert(gnp); 980 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 981 if (arsp->rel_rtype == R_386_TLS_IE) { 982 value += ofl->ofl_osgot->os_shdr->sh_addr; 983 } 984 985 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 986 ((flags & FLG_OF_RELOBJ) == 0)) { 987 Gotndx *gnp; 988 989 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 990 GOT_REF_GENERIC, ofl, NULL); 991 assert(gnp); 992 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 993 994 } else if ((arsp->rel_flags & FLG_REL_STLS) && 995 ((flags & FLG_OF_RELOBJ) == 0)) { 996 Xword tlsstatsize; 997 998 /* 999 * This is the LE TLS reference model. Static 1000 * offset is hard-coded. 1001 */ 1002 tlsstatsize = S_ROUND(ofl->ofl_tlsphdr->p_memsz, 1003 M_TLSSTATALIGN); 1004 value = tlsstatsize - value; 1005 1006 /* 1007 * Since this code is fixed up, it assumes a 1008 * negative offset that can be added to the 1009 * thread pointer. 1010 */ 1011 if ((arsp->rel_rtype == R_386_TLS_LDO_32) || 1012 (arsp->rel_rtype == R_386_TLS_LE)) 1013 value = -value; 1014 } 1015 1016 if (arsp->rel_isdesc->is_file) 1017 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 1018 else 1019 ifl_name = MSG_INTL(MSG_STR_NULL); 1020 1021 /* 1022 * Make sure we have data to relocate. Compiler and assembler 1023 * developers have been known to generate relocations against 1024 * invalid sections (normally .bss), so for their benefit give 1025 * them sufficient information to help analyze the problem. 1026 * End users should never see this. 1027 */ 1028 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 1029 Conv_inv_buf_t inv_buf; 1030 1031 eprintf(ofl->ofl_lml, ERR_FATAL, 1032 MSG_INTL(MSG_REL_EMPTYSEC), 1033 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 1034 ifl_name, ld_reloc_sym_name(arsp), 1035 EC_WORD(arsp->rel_isdesc->is_scnndx), 1036 arsp->rel_isdesc->is_name); 1037 return (S_ERROR); 1038 } 1039 1040 /* 1041 * Get the address of the data item we need to modify. 1042 */ 1043 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 1044 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata)); 1045 1046 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT, 1047 M_MACH, SHT_REL, arsp, EC_NATPTR(addr), value, 1048 ld_reloc_sym_name)); 1049 addr += (uintptr_t)osp->os_outdata->d_buf; 1050 1051 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 1052 ofl->ofl_size) || (arsp->rel_roffset > 1053 osp->os_shdr->sh_size)) { 1054 Conv_inv_buf_t inv_buf; 1055 int class; 1056 1057 if (((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 1058 ofl->ofl_size) 1059 class = ERR_FATAL; 1060 else 1061 class = ERR_WARNING; 1062 1063 eprintf(ofl->ofl_lml, class, 1064 MSG_INTL(MSG_REL_INVALOFFSET), 1065 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 1066 ifl_name, EC_WORD(arsp->rel_isdesc->is_scnndx), 1067 arsp->rel_isdesc->is_name, ld_reloc_sym_name(arsp), 1068 EC_ADDR((uintptr_t)addr - 1069 (uintptr_t)ofl->ofl_nehdr)); 1070 1071 if (class == ERR_FATAL) { 1072 return_code = S_ERROR; 1073 continue; 1074 } 1075 } 1076 1077 /* 1078 * The relocation is additive. Ignore the previous symbol 1079 * value if this local partial symbol is expanded. 1080 */ 1081 if (moved) 1082 value -= *addr; 1083 1084 /* 1085 * If we have a replacement value for the relocation 1086 * target, put it in place now. 1087 */ 1088 if (arsp->rel_flags & FLG_REL_NADDEND) { 1089 Xword addend = arsp->rel_raddend; 1090 1091 if (ld_reloc_targval_set(ofl, arsp, addr, addend) == 0) 1092 return (S_ERROR); 1093 } 1094 1095 /* 1096 * If '-z noreloc' is specified - skip the do_reloc_ld stage. 1097 */ 1098 if (OFL_DO_RELOC(ofl)) { 1099 if (do_reloc_ld(arsp, addr, &value, ld_reloc_sym_name, 1100 ifl_name, OFL_SWAP_RELOC_DATA(ofl, arsp), 1101 ofl->ofl_lml) == 0) 1102 return_code = S_ERROR; 1103 } 1104 } 1105 return (return_code); 1106 } 1107 1108 /* 1109 * Add an output relocation record. 1110 */ 1111 static uintptr_t 1112 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1113 { 1114 Rel_desc *orsp; 1115 Sym_desc *sdp = rsp->rel_sym; 1116 1117 /* 1118 * Static executables *do not* want any relocations against them. 1119 * Since our engine still creates relocations against a WEAK UNDEFINED 1120 * symbol in a static executable, it's best to disable them here 1121 * instead of through out the relocation code. 1122 */ 1123 if (OFL_IS_STATIC_EXEC(ofl)) 1124 return (1); 1125 1126 /* 1127 * If we are adding a output relocation against a section 1128 * symbol (non-RELATIVE) then mark that section. These sections 1129 * will be added to the .dynsym symbol table. 1130 */ 1131 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1132 ((flags & FLG_REL_SCNNDX) || 1133 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1134 1135 /* 1136 * If this is a COMMON symbol - no output section 1137 * exists yet - (it's created as part of sym_validate()). 1138 * So - we mark here that when it's created it should 1139 * be tagged with the FLG_OS_OUTREL flag. 1140 */ 1141 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1142 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1143 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1144 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1145 else 1146 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1147 } else { 1148 Os_desc *osp; 1149 Is_desc *isp = sdp->sd_isc; 1150 1151 if (isp && ((osp = isp->is_osdesc) != NULL) && 1152 ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1153 ofl->ofl_dynshdrcnt++; 1154 osp->os_flags |= FLG_OS_OUTREL; 1155 } 1156 } 1157 } 1158 1159 /* Enter it into the output relocation cache */ 1160 if ((orsp = ld_reloc_enter(ofl, &ofl->ofl_outrels, rsp, flags)) == NULL) 1161 return (S_ERROR); 1162 1163 if (flags & FLG_REL_GOT) 1164 ofl->ofl_relocgotsz += (Xword)sizeof (Rel); 1165 else if (flags & FLG_REL_PLT) 1166 ofl->ofl_relocpltsz += (Xword)sizeof (Rel); 1167 else if (flags & FLG_REL_BSS) 1168 ofl->ofl_relocbsssz += (Xword)sizeof (Rel); 1169 else if (flags & FLG_REL_NOINFO) 1170 ofl->ofl_relocrelsz += (Xword)sizeof (Rel); 1171 else 1172 RELAUX_GET_OSDESC(orsp)->os_szoutrels += (Xword)sizeof (Rel); 1173 1174 if (orsp->rel_rtype == M_R_RELATIVE) 1175 ofl->ofl_relocrelcnt++; 1176 1177 /* 1178 * We don't perform sorting on PLT relocations because 1179 * they have already been assigned a PLT index and if we 1180 * were to sort them we would have to re-assign the plt indexes. 1181 */ 1182 if (!(flags & FLG_REL_PLT)) 1183 ofl->ofl_reloccnt++; 1184 1185 /* 1186 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1187 */ 1188 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1189 ofl->ofl_flags |= FLG_OF_BLDGOT; 1190 1191 /* 1192 * Identify and possibly warn of a displacement relocation. 1193 */ 1194 if (orsp->rel_flags & FLG_REL_DISP) { 1195 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1196 1197 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1198 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1199 } 1200 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL, 1201 M_MACH, orsp)); 1202 return (1); 1203 } 1204 1205 /* 1206 * process relocation for a LOCAL symbol 1207 */ 1208 static uintptr_t 1209 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1210 { 1211 ofl_flag_t flags = ofl->ofl_flags; 1212 Sym_desc *sdp = rsp->rel_sym; 1213 Word shndx = sdp->sd_sym->st_shndx; 1214 1215 /* 1216 * if ((shared object) and (not pc relative relocation) and 1217 * (not against ABS symbol)) 1218 * then 1219 * build R_386_RELATIVE 1220 * fi 1221 */ 1222 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1223 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1224 !(IS_GOT_BASED(rsp->rel_rtype)) && 1225 !(rsp->rel_isdesc != NULL && 1226 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1227 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1228 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1229 Word ortype = rsp->rel_rtype; 1230 1231 rsp->rel_rtype = R_386_RELATIVE; 1232 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR) 1233 return (S_ERROR); 1234 rsp->rel_rtype = ortype; 1235 } 1236 1237 /* 1238 * If the relocation is against a 'non-allocatable' section 1239 * and we can not resolve it now - then give a warning 1240 * message. 1241 * 1242 * We can not resolve the symbol if either: 1243 * a) it's undefined 1244 * b) it's defined in a shared library and a 1245 * COPY relocation hasn't moved it to the executable 1246 * 1247 * Note: because we process all of the relocations against the 1248 * text segment before any others - we know whether 1249 * or not a copy relocation will be generated before 1250 * we get here (see reloc_init()->reloc_segments()). 1251 */ 1252 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1253 ((shndx == SHN_UNDEF) || 1254 ((sdp->sd_ref == REF_DYN_NEED) && 1255 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1256 Conv_inv_buf_t inv_buf; 1257 Os_desc *osp = RELAUX_GET_OSDESC(rsp); 1258 1259 /* 1260 * If the relocation is against a SHT_SUNW_ANNOTATE 1261 * section - then silently ignore that the relocation 1262 * can not be resolved. 1263 */ 1264 if (osp && (osp->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1265 return (0); 1266 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), 1267 conv_reloc_386_type(rsp->rel_rtype, 0, &inv_buf), 1268 rsp->rel_isdesc->is_file->ifl_name, 1269 ld_reloc_sym_name(rsp), osp->os_name); 1270 return (1); 1271 } 1272 1273 /* 1274 * Perform relocation. 1275 */ 1276 return (ld_add_actrel(NULL, rsp, ofl)); 1277 } 1278 1279 static uintptr_t 1280 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1281 { 1282 Word rtype = rsp->rel_rtype; 1283 Sym_desc *sdp = rsp->rel_sym; 1284 ofl_flag_t flags = ofl->ofl_flags; 1285 Gotndx *gnp; 1286 1287 /* 1288 * If we're building an executable - use either the IE or LE access 1289 * model. If we're building a shared object process any IE model. 1290 */ 1291 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1292 /* 1293 * Set the DF_STATIC_TLS flag. 1294 */ 1295 ofl->ofl_dtflags |= DF_STATIC_TLS; 1296 1297 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1298 /* 1299 * Assign a GOT entry for static TLS references. 1300 */ 1301 if ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 1302 GOT_REF_TLSIE, ofl, NULL)) == NULL) { 1303 1304 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1305 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1306 rtype, R_386_TLS_TPOFF, NULL) == S_ERROR) 1307 return (S_ERROR); 1308 } 1309 1310 /* 1311 * IE access model. 1312 */ 1313 if (IS_TLS_IE(rtype)) { 1314 if (ld_add_actrel(FLG_REL_STLS, 1315 rsp, ofl) == S_ERROR) 1316 return (S_ERROR); 1317 1318 /* 1319 * A non-pic shared object needs to adjust the 1320 * active relocation (indntpoff). 1321 */ 1322 if (((flags & FLG_OF_EXEC) == 0) && 1323 (rtype == R_386_TLS_IE)) { 1324 rsp->rel_rtype = R_386_RELATIVE; 1325 return (ld_add_outrel(NULL, rsp, ofl)); 1326 } 1327 return (1); 1328 } 1329 1330 /* 1331 * Fixups are required for other executable models. 1332 */ 1333 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1334 rsp, ofl)); 1335 } 1336 1337 /* 1338 * LE access model. 1339 */ 1340 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32)) 1341 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1342 1343 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1344 rsp, ofl)); 1345 } 1346 1347 /* 1348 * Building a shared object. 1349 * 1350 * Assign a GOT entry for a dynamic TLS reference. 1351 */ 1352 if (IS_TLS_LD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 1353 GOT_REF_TLSLD, ofl, NULL)) == NULL)) { 1354 1355 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1356 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, NULL) == S_ERROR) 1357 return (S_ERROR); 1358 1359 } else if (IS_TLS_GD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 1360 GOT_REF_TLSGD, ofl, NULL)) == NULL)) { 1361 1362 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1363 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32, 1364 R_386_TLS_DTPOFF32) == S_ERROR) 1365 return (S_ERROR); 1366 } 1367 1368 /* 1369 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1370 * cause a call to __tls_get_addr(). Convert this relocation to that 1371 * symbol now, and prepare for the PLT magic. 1372 */ 1373 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) { 1374 Sym_desc *tlsgetsym; 1375 1376 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU), 1377 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1378 return (S_ERROR); 1379 1380 rsp->rel_sym = tlsgetsym; 1381 rsp->rel_rtype = R_386_PLT32; 1382 1383 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1384 return (S_ERROR); 1385 1386 rsp->rel_sym = sdp; 1387 rsp->rel_rtype = rtype; 1388 return (1); 1389 } 1390 1391 if (IS_TLS_LD(rtype)) 1392 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1393 1394 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1395 } 1396 1397 /* ARGSUSED4 */ 1398 static uintptr_t 1399 ld_assign_got_ndx(Alist **alpp, Gotndx *pgnp, Gotref gref, Ofl_desc *ofl, 1400 Rel_desc *rsp, Sym_desc *sdp) 1401 { 1402 Gotndx gn, *gnp; 1403 uint_t gotents; 1404 1405 if (pgnp) 1406 return (1); 1407 1408 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1409 gotents = 2; 1410 else 1411 gotents = 1; 1412 1413 gn.gn_addend = 0; 1414 gn.gn_gotndx = ofl->ofl_gotcnt; 1415 gn.gn_gotref = gref; 1416 1417 ofl->ofl_gotcnt += gotents; 1418 1419 if (gref == GOT_REF_TLSLD) { 1420 if (ofl->ofl_tlsldgotndx == NULL) { 1421 if ((gnp = libld_malloc(sizeof (Gotndx))) == NULL) 1422 return (S_ERROR); 1423 (void) memcpy(gnp, &gn, sizeof (Gotndx)); 1424 ofl->ofl_tlsldgotndx = gnp; 1425 } 1426 return (1); 1427 } 1428 1429 /* 1430 * GOT indexes are maintained on an Alist, where there is typically 1431 * only one index. The usage of this list is to scan the list to find 1432 * an index, and then apply that index immediately to a relocation. 1433 * Thus there are no external references to these GOT index structures 1434 * that can be compromised by the Alist being reallocated. 1435 */ 1436 if (alist_append(alpp, &gn, sizeof (Gotndx), AL_CNT_SDP_GOT) == NULL) 1437 return (S_ERROR); 1438 1439 return (1); 1440 } 1441 1442 static void 1443 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 1444 { 1445 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 1446 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++; 1447 ofl->ofl_flags |= FLG_OF_BLDGOT; 1448 } 1449 1450 /* 1451 * Initializes .got[0] with the _DYNAMIC symbol value. 1452 */ 1453 static uintptr_t 1454 ld_fillin_gotplt(Ofl_desc *ofl) 1455 { 1456 ofl_flag_t flags = ofl->ofl_flags; 1457 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 1458 1459 if (ofl->ofl_osgot) { 1460 Sym_desc *sdp; 1461 1462 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 1463 SYM_NOHASH, NULL, ofl)) != NULL) { 1464 uchar_t *genptr; 1465 1466 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 1467 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 1468 /* LINTED */ 1469 *(Word *)genptr = (Word)sdp->sd_sym->st_value; 1470 if (bswap) 1471 /* LINTED */ 1472 *(Word *)genptr = 1473 /* LINTED */ 1474 ld_bswap_Word(*(Word *)genptr); 1475 } 1476 } 1477 1478 /* 1479 * Fill in the reserved slot in the procedure linkage table the first 1480 * entry is: 1481 * if (building a.out) { 1482 * PUSHL got[1] # the address of the link map entry 1483 * JMP * got[2] # the address of rtbinder 1484 * } else { 1485 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry 1486 * JMP * got[2]@GOT(%ebx) # the address of rtbinder 1487 * } 1488 */ 1489 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { 1490 uchar_t *pltent; 1491 1492 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 1493 if (!(flags & FLG_OF_SHAROBJ)) { 1494 pltent[0] = M_SPECIAL_INST; 1495 pltent[1] = M_PUSHL_DISP; 1496 pltent += 2; 1497 /* LINTED */ 1498 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1499 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE); 1500 if (bswap) 1501 /* LINTED */ 1502 *(Word *)pltent = 1503 /* LINTED */ 1504 ld_bswap_Word(*(Word *)pltent); 1505 pltent += 4; 1506 pltent[0] = M_SPECIAL_INST; 1507 pltent[1] = M_JMP_DISP_IND; 1508 pltent += 2; 1509 /* LINTED */ 1510 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1511 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE); 1512 if (bswap) 1513 /* LINTED */ 1514 *(Word *)pltent = 1515 /* LINTED */ 1516 ld_bswap_Word(*(Word *)pltent); 1517 } else { 1518 pltent[0] = M_SPECIAL_INST; 1519 pltent[1] = M_PUSHL_REG_DISP; 1520 pltent += 2; 1521 /* LINTED */ 1522 *(Word *)pltent = (Word)(M_GOT_XLINKMAP * 1523 M_GOT_ENTSIZE); 1524 if (bswap) 1525 /* LINTED */ 1526 *(Word *)pltent = 1527 /* LINTED */ 1528 ld_bswap_Word(*(Word *)pltent); 1529 pltent += 4; 1530 pltent[0] = M_SPECIAL_INST; 1531 pltent[1] = M_JMP_REG_DISP_IND; 1532 pltent += 2; 1533 /* LINTED */ 1534 *(Word *)pltent = (Word)(M_GOT_XRTLD * 1535 M_GOT_ENTSIZE); 1536 if (bswap) 1537 /* LINTED */ 1538 *(Word *)pltent = 1539 /* LINTED */ 1540 ld_bswap_Word(*(Word *)pltent); 1541 } 1542 } 1543 return (1); 1544 } 1545 1546 1547 1548 /* 1549 * Template for generating "void (*)(void)" function 1550 */ 1551 static const uchar_t nullfunc_tmpl[] = { /* IA32 */ 1552 /* 0x00 */ 0xc3 /* ret */ 1553 }; 1554 1555 1556 1557 /* 1558 * Function used to provide fill padding in SHF_EXECINSTR sections 1559 * 1560 * entry: 1561 * 1562 * base - base address of section being filled 1563 * offset - starting offset for fill within memory referenced by base 1564 * cnt - # bytes to be filled 1565 * 1566 * exit: 1567 * The fill has been completed. 1568 */ 1569 static void 1570 execfill(void *base, off_t off, size_t cnt) 1571 { 1572 /* 1573 * 0x90 is an X86 NOP instruction in both 32 and 64-bit worlds. 1574 * There are no alignment constraints. 1575 */ 1576 (void) memset(off + (char *)base, 0x90, cnt); 1577 } 1578 1579 1580 /* 1581 * Return the ld_targ definition for this target. 1582 */ 1583 const Target * 1584 ld_targ_init_x86(void) 1585 { 1586 static const Target _ld_targ = { 1587 { /* Target_mach */ 1588 M_MACH, /* m_mach */ 1589 M_MACHPLUS, /* m_machplus */ 1590 M_FLAGSPLUS, /* m_flagsplus */ 1591 M_CLASS, /* m_class */ 1592 M_DATA, /* m_data */ 1593 1594 M_SEGM_ALIGN, /* m_segm_align */ 1595 M_SEGM_ORIGIN, /* m_segm_origin */ 1596 M_SEGM_AORIGIN, /* m_segm_aorigin */ 1597 M_DATASEG_PERM, /* m_dataseg_perm */ 1598 M_STACK_PERM, /* m_stack_perm */ 1599 M_WORD_ALIGN, /* m_word_align */ 1600 MSG_ORIG(MSG_PTH_RTLD), /* m_def_interp */ 1601 1602 /* Relocation type codes */ 1603 M_R_ARRAYADDR, /* m_r_arrayaddr */ 1604 M_R_COPY, /* m_r_copy */ 1605 M_R_GLOB_DAT, /* m_r_glob_dat */ 1606 M_R_JMP_SLOT, /* m_r_jmp_slot */ 1607 M_R_NUM, /* m_r_num */ 1608 M_R_NONE, /* m_r_none */ 1609 M_R_RELATIVE, /* m_r_relative */ 1610 M_R_REGISTER, /* m_r_register */ 1611 1612 /* Relocation related constants */ 1613 M_REL_DT_COUNT, /* m_rel_dt_count */ 1614 M_REL_DT_ENT, /* m_rel_dt_ent */ 1615 M_REL_DT_SIZE, /* m_rel_dt_size */ 1616 M_REL_DT_TYPE, /* m_rel_dt_type */ 1617 M_REL_SHT_TYPE, /* m_rel_sht_type */ 1618 1619 /* GOT related constants */ 1620 M_GOT_ENTSIZE, /* m_got_entsize */ 1621 M_GOT_XNumber, /* m_got_xnumber */ 1622 1623 /* PLT related constants */ 1624 M_PLT_ALIGN, /* m_plt_align */ 1625 M_PLT_ENTSIZE, /* m_plt_entsize */ 1626 M_PLT_RESERVSZ, /* m_plt_reservsz */ 1627 M_PLT_SHF_FLAGS, /* m_plt_shf_flags */ 1628 1629 /* Section type of .eh_frame/.eh_frame_hdr sections */ 1630 SHT_PROGBITS, /* m_sht_unwind */ 1631 1632 M_DT_REGISTER, /* m_dt_register */ 1633 }, 1634 { /* Target_machid */ 1635 M_ID_ARRAY, /* id_array */ 1636 M_ID_BSS, /* id_bss */ 1637 M_ID_CAP, /* id_cap */ 1638 M_ID_CAPINFO, /* id_capinfo */ 1639 M_ID_CAPCHAIN, /* id_capchain */ 1640 M_ID_DATA, /* id_data */ 1641 M_ID_DYNAMIC, /* id_dynamic */ 1642 M_ID_DYNSORT, /* id_dynsort */ 1643 M_ID_DYNSTR, /* id_dynstr */ 1644 M_ID_DYNSYM, /* id_dynsym */ 1645 M_ID_DYNSYM_NDX, /* id_dynsym_ndx */ 1646 M_ID_GOT, /* id_got */ 1647 M_ID_UNKNOWN, /* id_gotdata (unused) */ 1648 M_ID_HASH, /* id_hash */ 1649 M_ID_INTERP, /* id_interp */ 1650 M_ID_LBSS, /* id_lbss */ 1651 M_ID_LDYNSYM, /* id_ldynsym */ 1652 M_ID_NOTE, /* id_note */ 1653 M_ID_NULL, /* id_null */ 1654 M_ID_PLT, /* id_plt */ 1655 M_ID_REL, /* id_rel */ 1656 M_ID_STRTAB, /* id_strtab */ 1657 M_ID_SYMINFO, /* id_syminfo */ 1658 M_ID_SYMTAB, /* id_symtab */ 1659 M_ID_SYMTAB_NDX, /* id_symtab_ndx */ 1660 M_ID_TEXT, /* id_text */ 1661 M_ID_TLS, /* id_tls */ 1662 M_ID_TLSBSS, /* id_tlsbss */ 1663 M_ID_UNKNOWN, /* id_unknown */ 1664 M_ID_UNWIND, /* id_unwind */ 1665 M_ID_UNWINDHDR, /* id_unwindhdr */ 1666 M_ID_USER, /* id_user */ 1667 M_ID_VERSION, /* id_version */ 1668 }, 1669 { /* Target_nullfunc */ 1670 nullfunc_tmpl, /* nf_template */ 1671 sizeof (nullfunc_tmpl), /* nf_size */ 1672 }, 1673 { /* Target_fillfunc */ 1674 execfill /* ff_execfill */ 1675 }, 1676 { /* Target_machrel */ 1677 reloc_table, 1678 1679 ld_init_rel, /* mr_init_rel */ 1680 ld_mach_eflags, /* mr_mach_eflags */ 1681 ld_mach_make_dynamic, /* mr_mach_make_dynamic */ 1682 ld_mach_update_odynamic, /* mr_mach_update_odynamic */ 1683 ld_calc_plt_addr, /* mr_calc_plt_addr */ 1684 ld_perform_outreloc, /* mr_perform_outreloc */ 1685 ld_do_activerelocs, /* mr_do_activerelocs */ 1686 ld_add_outrel, /* mr_add_outrel */ 1687 NULL, /* mr_reloc_register */ 1688 ld_reloc_local, /* mr_reloc_local */ 1689 NULL, /* mr_reloc_GOTOP */ 1690 ld_reloc_TLS, /* mr_reloc_TLS */ 1691 NULL, /* mr_assign_got */ 1692 ld_find_got_ndx, /* mr_find_got_ndx */ 1693 ld_calc_got_offset, /* mr_calc_got_offset */ 1694 ld_assign_got_ndx, /* mr_assign_got_ndx */ 1695 ld_assign_plt_ndx, /* mr_assign_plt_ndx */ 1696 NULL, /* mr_allocate_got */ 1697 ld_fillin_gotplt, /* mr_fillin_gotplt */ 1698 }, 1699 { /* Target_machsym */ 1700 NULL, /* ms_reg_check */ 1701 NULL, /* ms_mach_sym_typecheck */ 1702 NULL, /* ms_is_regsym */ 1703 NULL, /* ms_reg_find */ 1704 NULL /* ms_reg_enter */ 1705 } 1706 }; 1707 1708 return (&_ld_targ); 1709 } 1710