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, Boolean *remain_seen) 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, remain_seen); 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 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS), 645 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 646 arsp->rel_isdesc->is_file->ifl_name, 647 ld_reloc_sym_name(arsp), 648 arsp->rel_isdesc->is_name, 649 EC_OFF(arsp->rel_roffset)); 650 } 651 return (FIX_ERROR); 652 653 case R_386_TLS_IE: 654 /* 655 * These transitions are a little different than the 656 * others, in that we could have multiple instructions 657 * pointed to by a single relocation. Depending upon the 658 * instruction, we perform a different code transition. 659 * 660 * Here's the known transitions: 661 * 1) movl foo@indntpoff, %eax 662 * 0xa1, foo@indntpoff 663 * 664 * 2) movl foo@indntpoff, %eax 665 * 0x8b, 0x05 | (reg << 3), foo@gotntpoff 666 * 667 * 3) addl foo@indntpoff, %eax 668 * 0x03, 0x05 | (reg << 3), foo@gotntpoff 669 * 670 * Transitions IE -> LE 671 * 672 * 1) movl $foo@ntpoff, %eax 673 * 0xb8, foo@ntpoff 674 * 675 * 2) movl $foo@ntpoff, %reg 676 * 0xc7, 0xc0 | reg, foo@ntpoff 677 * 678 * 3) addl $foo@ntpoff, %reg 679 * 0x81, 0xc0 | reg, foo@ntpoff 680 */ 681 arsp->rel_rtype = R_386_TLS_LE; 682 offset--; 683 if (offset[0] == 0xa1) { 684 /* case 1 above */ 685 offset[0] = 0xb8; /* movl */ 686 return (FIX_RELOC); 687 } 688 689 offset--; 690 if (offset[0] == 0x8b) { 691 /* case 2 above */ 692 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 693 offset[0] = 0xc7; /* movl */ 694 offset[1] = 0xc0 | r2; 695 return (FIX_RELOC); 696 } 697 if (offset[0] == 0x03) { 698 /* case 3 above */ 699 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 700 offset[0] = 0x81; /* addl */ 701 offset[1] = 0xc0 | r2; 702 return (FIX_RELOC); 703 } 704 /* 705 * Unexpected instruction sequence - fatal error. 706 */ 707 { 708 Conv_inv_buf_t inv_buf; 709 710 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS), 711 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 712 arsp->rel_isdesc->is_file->ifl_name, 713 ld_reloc_sym_name(arsp), 714 arsp->rel_isdesc->is_name, 715 EC_OFF(arsp->rel_roffset)); 716 } 717 return (FIX_ERROR); 718 } 719 return (FIX_RELOC); 720 } 721 722 static uintptr_t 723 ld_do_activerelocs(Ofl_desc *ofl) 724 { 725 Rel_desc *arsp; 726 Rel_cachebuf *rcbp; 727 Aliste idx; 728 uintptr_t return_code = 1; 729 ofl_flag_t flags = ofl->ofl_flags; 730 731 if (aplist_nitems(ofl->ofl_actrels.rc_list) != 0) 732 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 733 734 /* 735 * Process active relocations. 736 */ 737 REL_CACHE_TRAVERSE(&ofl->ofl_actrels, idx, rcbp, arsp) { 738 uchar_t *addr; 739 Xword value; 740 Sym_desc *sdp; 741 const char *ifl_name; 742 Xword refaddr; 743 int moved = 0; 744 Gotref gref; 745 Os_desc *osp; 746 747 /* 748 * If the section this relocation is against has been discarded 749 * (-zignore), then discard (skip) the relocation itself. 750 */ 751 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 752 ((arsp->rel_flags & (FLG_REL_GOT | FLG_REL_BSS | 753 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 754 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, arsp)); 755 continue; 756 } 757 758 /* 759 * We determine what the 'got reference' model (if required) 760 * is at this point. This needs to be done before tls_fixup() 761 * since it may 'transition' our instructions. 762 * 763 * The got table entries have already been assigned, 764 * and we bind to those initial entries. 765 */ 766 if (arsp->rel_flags & FLG_REL_DTLS) 767 gref = GOT_REF_TLSGD; 768 else if (arsp->rel_flags & FLG_REL_MTLS) 769 gref = GOT_REF_TLSLD; 770 else if (arsp->rel_flags & FLG_REL_STLS) 771 gref = GOT_REF_TLSIE; 772 else 773 gref = GOT_REF_GENERIC; 774 775 /* 776 * Perform any required TLS fixups. 777 */ 778 if (arsp->rel_flags & FLG_REL_TLSFIX) { 779 Fixupret ret; 780 781 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 782 return (S_ERROR); 783 if (ret == FIX_DONE) 784 continue; 785 } 786 787 /* 788 * If this is a relocation against a move table, or 789 * expanded move table, adjust the relocation entries. 790 */ 791 if (RELAUX_GET_MOVE(arsp)) 792 ld_adj_movereloc(ofl, arsp); 793 794 sdp = arsp->rel_sym; 795 refaddr = arsp->rel_roffset + 796 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 797 798 if (arsp->rel_flags & FLG_REL_CLVAL) 799 value = 0; 800 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) { 801 /* 802 * The value for a symbol pointing to a SECTION 803 * is based off of that sections position. 804 */ 805 if (sdp->sd_isc->is_flags & FLG_IS_RELUPD) { 806 Sym_desc *sym; 807 Xword radd; 808 uchar_t *raddr = (uchar_t *) 809 arsp->rel_isdesc->is_indata->d_buf + 810 arsp->rel_roffset; 811 812 /* 813 * This is a REL platform. Hence, the second 814 * argument of ld_am_I_partial() is the value 815 * stored at the target address where the 816 * relocation is going to be applied. 817 */ 818 if (ld_reloc_targval_get(ofl, arsp, raddr, 819 &radd) == 0) 820 return (S_ERROR); 821 sym = ld_am_I_partial(arsp, radd); 822 if (sym) { 823 Sym *osym = sym->sd_osym; 824 825 /* 826 * The symbol was moved, so adjust the 827 * value relative to the new section. 828 */ 829 value = sym->sd_sym->st_value; 830 moved = 1; 831 832 /* 833 * The original raddend covers the 834 * displacement from the section start 835 * to the desired address. The value 836 * computed above gets us from the 837 * section start to the start of the 838 * symbol range. Adjust the old raddend 839 * to remove the offset from section 840 * start to symbol start, leaving the 841 * displacement within the range of 842 * the symbol. 843 */ 844 if (osym->st_value != 0) { 845 radd -= osym->st_value; 846 if (ld_reloc_targval_set(ofl, 847 arsp, raddr, radd) == 0) 848 return (S_ERROR); 849 } 850 } 851 } 852 if (!moved) { 853 value = _elf_getxoff(sdp->sd_isc->is_indata); 854 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 855 value += sdp->sd_isc-> 856 is_osdesc->os_shdr->sh_addr; 857 } 858 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 859 value -= ofl->ofl_tlsphdr->p_vaddr; 860 861 } else if (IS_SIZE(arsp->rel_rtype)) { 862 /* 863 * Size relocations require the symbols size. 864 */ 865 value = sdp->sd_sym->st_size; 866 867 } else if ((sdp->sd_flags & FLG_SY_CAP) && 868 sdp->sd_aux && sdp->sd_aux->sa_PLTndx) { 869 /* 870 * If relocation is against a capabilities symbol, we 871 * need to jump to an associated PLT, so that at runtime 872 * ld.so.1 is involved to determine the best binding 873 * choice. Otherwise, the value is the symbols value. 874 */ 875 value = ld_calc_plt_addr(sdp, ofl); 876 877 } else 878 value = sdp->sd_sym->st_value; 879 880 /* 881 * Relocation against the GLOBAL_OFFSET_TABLE. 882 */ 883 if ((arsp->rel_flags & FLG_REL_GOT) && 884 !ld_reloc_set_aux_osdesc(ofl, arsp, ofl->ofl_osgot)) 885 return (S_ERROR); 886 osp = RELAUX_GET_OSDESC(arsp); 887 888 /* 889 * If loadable and not producing a relocatable object add the 890 * sections virtual address to the reference address. 891 */ 892 if ((arsp->rel_flags & FLG_REL_LOAD) && 893 ((flags & FLG_OF_RELOBJ) == 0)) 894 refaddr += 895 arsp->rel_isdesc->is_osdesc->os_shdr->sh_addr; 896 897 /* 898 * If this entry has a PLT assigned to it, its value is actually 899 * the address of the PLT (and not the address of the function). 900 */ 901 if (IS_PLT(arsp->rel_rtype)) { 902 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 903 value = ld_calc_plt_addr(sdp, ofl); 904 } 905 906 /* 907 * Determine whether the value needs further adjustment. Filter 908 * through the attributes of the relocation to determine what 909 * adjustment is required. Note, many of the following cases 910 * are only applicable when a .got is present. As a .got is 911 * not generated when a relocatable object is being built, 912 * any adjustments that require a .got need to be skipped. 913 */ 914 if ((arsp->rel_flags & FLG_REL_GOT) && 915 ((flags & FLG_OF_RELOBJ) == 0)) { 916 Xword R1addr; 917 uintptr_t R2addr; 918 Word gotndx; 919 Gotndx *gnp; 920 921 /* 922 * Perform relocation against GOT table. Since this 923 * doesn't fit exactly into a relocation we place the 924 * appropriate byte in the GOT directly 925 * 926 * Calculate offset into GOT at which to apply 927 * the relocation. 928 */ 929 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL); 930 assert(gnp); 931 932 if (arsp->rel_rtype == R_386_TLS_DTPOFF32) 933 gotndx = gnp->gn_gotndx + 1; 934 else 935 gotndx = gnp->gn_gotndx; 936 937 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE); 938 939 /* 940 * Add the GOTs data's offset. 941 */ 942 R2addr = R1addr + (uintptr_t)osp->os_outdata->d_buf; 943 944 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT, 945 M_MACH, SHT_REL, arsp, R1addr, value, 946 ld_reloc_sym_name)); 947 948 /* 949 * And do it. 950 */ 951 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 952 *(Xword *)R2addr = ld_bswap_Xword(value); 953 else 954 *(Xword *)R2addr = value; 955 continue; 956 957 } else if (IS_GOT_BASED(arsp->rel_rtype) && 958 ((flags & FLG_OF_RELOBJ) == 0)) { 959 value -= ofl->ofl_osgot->os_shdr->sh_addr; 960 961 } else if (IS_GOT_PC(arsp->rel_rtype) && 962 ((flags & FLG_OF_RELOBJ) == 0)) { 963 value = (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) - 964 refaddr; 965 966 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) && 967 (((flags & FLG_OF_RELOBJ) == 0) || 968 (osp == sdp->sd_isc->is_osdesc))) { 969 value -= refaddr; 970 971 } else if (IS_TLS_INS(arsp->rel_rtype) && 972 IS_GOT_RELATIVE(arsp->rel_rtype) && 973 ((flags & FLG_OF_RELOBJ) == 0)) { 974 Gotndx *gnp; 975 976 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL); 977 assert(gnp); 978 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 979 if (arsp->rel_rtype == R_386_TLS_IE) { 980 value += ofl->ofl_osgot->os_shdr->sh_addr; 981 } 982 983 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 984 ((flags & FLG_OF_RELOBJ) == 0)) { 985 Gotndx *gnp; 986 987 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 988 GOT_REF_GENERIC, ofl, NULL); 989 assert(gnp); 990 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 991 992 } else if ((arsp->rel_flags & FLG_REL_STLS) && 993 ((flags & FLG_OF_RELOBJ) == 0)) { 994 Xword tlsstatsize; 995 996 /* 997 * This is the LE TLS reference model. Static 998 * offset is hard-coded. 999 */ 1000 tlsstatsize = S_ROUND(ofl->ofl_tlsphdr->p_memsz, 1001 M_TLSSTATALIGN); 1002 value = tlsstatsize - value; 1003 1004 /* 1005 * Since this code is fixed up, it assumes a 1006 * negative offset that can be added to the 1007 * thread pointer. 1008 */ 1009 if ((arsp->rel_rtype == R_386_TLS_LDO_32) || 1010 (arsp->rel_rtype == R_386_TLS_LE)) 1011 value = -value; 1012 } 1013 1014 if (arsp->rel_isdesc->is_file) 1015 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 1016 else 1017 ifl_name = MSG_INTL(MSG_STR_NULL); 1018 1019 /* 1020 * Make sure we have data to relocate. Compiler and assembler 1021 * developers have been known to generate relocations against 1022 * invalid sections (normally .bss), so for their benefit give 1023 * them sufficient information to help analyze the problem. 1024 * End users should never see this. 1025 */ 1026 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 1027 Conv_inv_buf_t inv_buf; 1028 1029 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_EMPTYSEC), 1030 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 1031 ifl_name, ld_reloc_sym_name(arsp), 1032 EC_WORD(arsp->rel_isdesc->is_scnndx), 1033 arsp->rel_isdesc->is_name); 1034 return (S_ERROR); 1035 } 1036 1037 /* 1038 * Get the address of the data item we need to modify. 1039 */ 1040 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 1041 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata)); 1042 1043 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT, 1044 M_MACH, SHT_REL, arsp, EC_NATPTR(addr), value, 1045 ld_reloc_sym_name)); 1046 addr += (uintptr_t)osp->os_outdata->d_buf; 1047 1048 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 1049 ofl->ofl_size) || (arsp->rel_roffset > 1050 osp->os_shdr->sh_size)) { 1051 Conv_inv_buf_t inv_buf; 1052 int class; 1053 1054 if (((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 1055 ofl->ofl_size) 1056 class = ERR_FATAL; 1057 else 1058 class = ERR_WARNING; 1059 1060 ld_eprintf(ofl, class, MSG_INTL(MSG_REL_INVALOFFSET), 1061 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 1062 ifl_name, EC_WORD(arsp->rel_isdesc->is_scnndx), 1063 arsp->rel_isdesc->is_name, ld_reloc_sym_name(arsp), 1064 EC_ADDR((uintptr_t)addr - 1065 (uintptr_t)ofl->ofl_nehdr)); 1066 1067 if (class == ERR_FATAL) { 1068 return_code = S_ERROR; 1069 continue; 1070 } 1071 } 1072 1073 /* 1074 * The relocation is additive. Ignore the previous symbol 1075 * value if this local partial symbol is expanded. 1076 */ 1077 if (moved) 1078 value -= *addr; 1079 1080 /* 1081 * If we have a replacement value for the relocation 1082 * target, put it in place now. 1083 */ 1084 if (arsp->rel_flags & FLG_REL_NADDEND) { 1085 Xword addend = arsp->rel_raddend; 1086 1087 if (ld_reloc_targval_set(ofl, arsp, addr, addend) == 0) 1088 return (S_ERROR); 1089 } 1090 1091 /* 1092 * If '-z noreloc' is specified - skip the do_reloc_ld stage. 1093 */ 1094 if (OFL_DO_RELOC(ofl)) { 1095 if (do_reloc_ld(arsp, addr, &value, ld_reloc_sym_name, 1096 ifl_name, OFL_SWAP_RELOC_DATA(ofl, arsp), 1097 ofl->ofl_lml) == 0) { 1098 ofl->ofl_flags |= FLG_OF_FATAL; 1099 return_code = S_ERROR; 1100 } 1101 } 1102 } 1103 return (return_code); 1104 } 1105 1106 /* 1107 * Add an output relocation record. 1108 */ 1109 static uintptr_t 1110 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1111 { 1112 Rel_desc *orsp; 1113 Sym_desc *sdp = rsp->rel_sym; 1114 1115 /* 1116 * Static executables *do not* want any relocations against them. 1117 * Since our engine still creates relocations against a WEAK UNDEFINED 1118 * symbol in a static executable, it's best to disable them here 1119 * instead of through out the relocation code. 1120 */ 1121 if (OFL_IS_STATIC_EXEC(ofl)) 1122 return (1); 1123 1124 /* 1125 * If we are adding a output relocation against a section 1126 * symbol (non-RELATIVE) then mark that section. These sections 1127 * will be added to the .dynsym symbol table. 1128 */ 1129 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1130 ((flags & FLG_REL_SCNNDX) || 1131 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1132 1133 /* 1134 * If this is a COMMON symbol - no output section 1135 * exists yet - (it's created as part of sym_validate()). 1136 * So - we mark here that when it's created it should 1137 * be tagged with the FLG_OS_OUTREL flag. 1138 */ 1139 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1140 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1141 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1142 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1143 else 1144 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1145 } else { 1146 Os_desc *osp; 1147 Is_desc *isp = sdp->sd_isc; 1148 1149 if (isp && ((osp = isp->is_osdesc) != NULL) && 1150 ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1151 ofl->ofl_dynshdrcnt++; 1152 osp->os_flags |= FLG_OS_OUTREL; 1153 } 1154 } 1155 } 1156 1157 /* Enter it into the output relocation cache */ 1158 if ((orsp = ld_reloc_enter(ofl, &ofl->ofl_outrels, rsp, flags)) == NULL) 1159 return (S_ERROR); 1160 1161 if (flags & FLG_REL_GOT) 1162 ofl->ofl_relocgotsz += (Xword)sizeof (Rel); 1163 else if (flags & FLG_REL_PLT) 1164 ofl->ofl_relocpltsz += (Xword)sizeof (Rel); 1165 else if (flags & FLG_REL_BSS) 1166 ofl->ofl_relocbsssz += (Xword)sizeof (Rel); 1167 else if (flags & FLG_REL_NOINFO) 1168 ofl->ofl_relocrelsz += (Xword)sizeof (Rel); 1169 else 1170 RELAUX_GET_OSDESC(orsp)->os_szoutrels += (Xword)sizeof (Rel); 1171 1172 if (orsp->rel_rtype == M_R_RELATIVE) 1173 ofl->ofl_relocrelcnt++; 1174 1175 /* 1176 * We don't perform sorting on PLT relocations because 1177 * they have already been assigned a PLT index and if we 1178 * were to sort them we would have to re-assign the plt indexes. 1179 */ 1180 if (!(flags & FLG_REL_PLT)) 1181 ofl->ofl_reloccnt++; 1182 1183 /* 1184 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1185 */ 1186 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1187 ofl->ofl_flags |= FLG_OF_BLDGOT; 1188 1189 /* 1190 * Identify and possibly warn of a displacement relocation. 1191 */ 1192 if (orsp->rel_flags & FLG_REL_DISP) { 1193 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1194 1195 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1196 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1197 } 1198 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL, 1199 M_MACH, orsp)); 1200 return (1); 1201 } 1202 1203 /* 1204 * process relocation for a LOCAL symbol 1205 */ 1206 static uintptr_t 1207 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1208 { 1209 ofl_flag_t flags = ofl->ofl_flags; 1210 Sym_desc *sdp = rsp->rel_sym; 1211 Word shndx = sdp->sd_sym->st_shndx; 1212 1213 /* 1214 * if ((shared object) and (not pc relative relocation) and 1215 * (not against ABS symbol)) 1216 * then 1217 * build R_386_RELATIVE 1218 * fi 1219 */ 1220 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1221 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1222 !(IS_GOT_BASED(rsp->rel_rtype)) && 1223 !(rsp->rel_isdesc != NULL && 1224 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1225 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1226 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1227 Word ortype = rsp->rel_rtype; 1228 1229 rsp->rel_rtype = R_386_RELATIVE; 1230 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR) 1231 return (S_ERROR); 1232 rsp->rel_rtype = ortype; 1233 } 1234 1235 /* 1236 * If the relocation is against a 'non-allocatable' section 1237 * and we can not resolve it now - then give a warning 1238 * message. 1239 * 1240 * We can not resolve the symbol if either: 1241 * a) it's undefined 1242 * b) it's defined in a shared library and a 1243 * COPY relocation hasn't moved it to the executable 1244 * 1245 * Note: because we process all of the relocations against the 1246 * text segment before any others - we know whether 1247 * or not a copy relocation will be generated before 1248 * we get here (see reloc_init()->reloc_segments()). 1249 */ 1250 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1251 ((shndx == SHN_UNDEF) || 1252 ((sdp->sd_ref == REF_DYN_NEED) && 1253 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1254 Conv_inv_buf_t inv_buf; 1255 Os_desc *osp = RELAUX_GET_OSDESC(rsp); 1256 1257 /* 1258 * If the relocation is against a SHT_SUNW_ANNOTATE 1259 * section - then silently ignore that the relocation 1260 * can not be resolved. 1261 */ 1262 if (osp && (osp->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1263 return (0); 1264 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), 1265 conv_reloc_386_type(rsp->rel_rtype, 0, &inv_buf), 1266 rsp->rel_isdesc->is_file->ifl_name, 1267 ld_reloc_sym_name(rsp), osp->os_name); 1268 return (1); 1269 } 1270 1271 /* 1272 * Perform relocation. 1273 */ 1274 return (ld_add_actrel(NULL, rsp, ofl)); 1275 } 1276 1277 static uintptr_t 1278 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1279 { 1280 Word rtype = rsp->rel_rtype; 1281 Sym_desc *sdp = rsp->rel_sym; 1282 ofl_flag_t flags = ofl->ofl_flags; 1283 Gotndx *gnp; 1284 1285 /* 1286 * If we're building an executable - use either the IE or LE access 1287 * model. If we're building a shared object process any IE model. 1288 */ 1289 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1290 /* 1291 * Set the DF_STATIC_TLS flag. 1292 */ 1293 ofl->ofl_dtflags |= DF_STATIC_TLS; 1294 1295 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1296 /* 1297 * Assign a GOT entry for static TLS references. 1298 */ 1299 if ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 1300 GOT_REF_TLSIE, ofl, NULL)) == NULL) { 1301 1302 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1303 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1304 rtype, R_386_TLS_TPOFF, NULL) == S_ERROR) 1305 return (S_ERROR); 1306 } 1307 1308 /* 1309 * IE access model. 1310 */ 1311 if (IS_TLS_IE(rtype)) { 1312 if (ld_add_actrel(FLG_REL_STLS, 1313 rsp, ofl) == S_ERROR) 1314 return (S_ERROR); 1315 1316 /* 1317 * A non-pic shared object needs to adjust the 1318 * active relocation (indntpoff). 1319 */ 1320 if (((flags & FLG_OF_EXEC) == 0) && 1321 (rtype == R_386_TLS_IE)) { 1322 rsp->rel_rtype = R_386_RELATIVE; 1323 return (ld_add_outrel(NULL, rsp, ofl)); 1324 } 1325 return (1); 1326 } 1327 1328 /* 1329 * Fixups are required for other executable models. 1330 */ 1331 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1332 rsp, ofl)); 1333 } 1334 1335 /* 1336 * LE access model. 1337 */ 1338 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32)) 1339 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1340 1341 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1342 rsp, ofl)); 1343 } 1344 1345 /* 1346 * Building a shared object. 1347 * 1348 * Assign a GOT entry for a dynamic TLS reference. 1349 */ 1350 if (IS_TLS_LD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 1351 GOT_REF_TLSLD, ofl, NULL)) == NULL)) { 1352 1353 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1354 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, NULL) == S_ERROR) 1355 return (S_ERROR); 1356 1357 } else if (IS_TLS_GD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, 1358 GOT_REF_TLSGD, ofl, NULL)) == NULL)) { 1359 1360 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1361 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32, 1362 R_386_TLS_DTPOFF32) == S_ERROR) 1363 return (S_ERROR); 1364 } 1365 1366 /* 1367 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1368 * cause a call to __tls_get_addr(). Convert this relocation to that 1369 * symbol now, and prepare for the PLT magic. 1370 */ 1371 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) { 1372 Sym_desc *tlsgetsym; 1373 1374 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU), 1375 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1376 return (S_ERROR); 1377 1378 rsp->rel_sym = tlsgetsym; 1379 rsp->rel_rtype = R_386_PLT32; 1380 1381 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1382 return (S_ERROR); 1383 1384 rsp->rel_sym = sdp; 1385 rsp->rel_rtype = rtype; 1386 return (1); 1387 } 1388 1389 if (IS_TLS_LD(rtype)) 1390 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1391 1392 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1393 } 1394 1395 /* ARGSUSED4 */ 1396 static uintptr_t 1397 ld_assign_got_ndx(Alist **alpp, Gotndx *pgnp, Gotref gref, Ofl_desc *ofl, 1398 Rel_desc *rsp, Sym_desc *sdp) 1399 { 1400 Gotndx gn, *gnp; 1401 uint_t gotents; 1402 1403 if (pgnp) 1404 return (1); 1405 1406 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1407 gotents = 2; 1408 else 1409 gotents = 1; 1410 1411 gn.gn_addend = 0; 1412 gn.gn_gotndx = ofl->ofl_gotcnt; 1413 gn.gn_gotref = gref; 1414 1415 ofl->ofl_gotcnt += gotents; 1416 1417 if (gref == GOT_REF_TLSLD) { 1418 if (ofl->ofl_tlsldgotndx == NULL) { 1419 if ((gnp = libld_malloc(sizeof (Gotndx))) == NULL) 1420 return (S_ERROR); 1421 (void) memcpy(gnp, &gn, sizeof (Gotndx)); 1422 ofl->ofl_tlsldgotndx = gnp; 1423 } 1424 return (1); 1425 } 1426 1427 /* 1428 * GOT indexes are maintained on an Alist, where there is typically 1429 * only one index. The usage of this list is to scan the list to find 1430 * an index, and then apply that index immediately to a relocation. 1431 * Thus there are no external references to these GOT index structures 1432 * that can be compromised by the Alist being reallocated. 1433 */ 1434 if (alist_append(alpp, &gn, sizeof (Gotndx), AL_CNT_SDP_GOT) == NULL) 1435 return (S_ERROR); 1436 1437 return (1); 1438 } 1439 1440 static void 1441 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 1442 { 1443 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 1444 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++; 1445 ofl->ofl_flags |= FLG_OF_BLDGOT; 1446 } 1447 1448 /* 1449 * Initializes .got[0] with the _DYNAMIC symbol value. 1450 */ 1451 static uintptr_t 1452 ld_fillin_gotplt(Ofl_desc *ofl) 1453 { 1454 ofl_flag_t flags = ofl->ofl_flags; 1455 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 1456 1457 if (ofl->ofl_osgot) { 1458 Sym_desc *sdp; 1459 1460 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 1461 SYM_NOHASH, NULL, ofl)) != NULL) { 1462 uchar_t *genptr; 1463 1464 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 1465 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 1466 /* LINTED */ 1467 *(Word *)genptr = (Word)sdp->sd_sym->st_value; 1468 if (bswap) 1469 /* LINTED */ 1470 *(Word *)genptr = 1471 /* LINTED */ 1472 ld_bswap_Word(*(Word *)genptr); 1473 } 1474 } 1475 1476 /* 1477 * Fill in the reserved slot in the procedure linkage table the first 1478 * entry is: 1479 * if (building a.out) { 1480 * PUSHL got[1] # the address of the link map entry 1481 * JMP * got[2] # the address of rtbinder 1482 * } else { 1483 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry 1484 * JMP * got[2]@GOT(%ebx) # the address of rtbinder 1485 * } 1486 */ 1487 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { 1488 uchar_t *pltent; 1489 1490 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 1491 if (!(flags & FLG_OF_SHAROBJ)) { 1492 pltent[0] = M_SPECIAL_INST; 1493 pltent[1] = M_PUSHL_DISP; 1494 pltent += 2; 1495 /* LINTED */ 1496 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1497 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE); 1498 if (bswap) 1499 /* LINTED */ 1500 *(Word *)pltent = 1501 /* LINTED */ 1502 ld_bswap_Word(*(Word *)pltent); 1503 pltent += 4; 1504 pltent[0] = M_SPECIAL_INST; 1505 pltent[1] = M_JMP_DISP_IND; 1506 pltent += 2; 1507 /* LINTED */ 1508 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1509 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE); 1510 if (bswap) 1511 /* LINTED */ 1512 *(Word *)pltent = 1513 /* LINTED */ 1514 ld_bswap_Word(*(Word *)pltent); 1515 } else { 1516 pltent[0] = M_SPECIAL_INST; 1517 pltent[1] = M_PUSHL_REG_DISP; 1518 pltent += 2; 1519 /* LINTED */ 1520 *(Word *)pltent = (Word)(M_GOT_XLINKMAP * 1521 M_GOT_ENTSIZE); 1522 if (bswap) 1523 /* LINTED */ 1524 *(Word *)pltent = 1525 /* LINTED */ 1526 ld_bswap_Word(*(Word *)pltent); 1527 pltent += 4; 1528 pltent[0] = M_SPECIAL_INST; 1529 pltent[1] = M_JMP_REG_DISP_IND; 1530 pltent += 2; 1531 /* LINTED */ 1532 *(Word *)pltent = (Word)(M_GOT_XRTLD * 1533 M_GOT_ENTSIZE); 1534 if (bswap) 1535 /* LINTED */ 1536 *(Word *)pltent = 1537 /* LINTED */ 1538 ld_bswap_Word(*(Word *)pltent); 1539 } 1540 } 1541 return (1); 1542 } 1543 1544 1545 1546 /* 1547 * Template for generating "void (*)(void)" function 1548 */ 1549 static const uchar_t nullfunc_tmpl[] = { /* IA32 */ 1550 /* 0x00 */ 0xc3 /* ret */ 1551 }; 1552 1553 1554 1555 /* 1556 * Function used to provide fill padding in SHF_EXECINSTR sections 1557 * 1558 * entry: 1559 * 1560 * base - base address of section being filled 1561 * offset - starting offset for fill within memory referenced by base 1562 * cnt - # bytes to be filled 1563 * 1564 * exit: 1565 * The fill has been completed. 1566 */ 1567 static void 1568 execfill(void *base, off_t off, size_t cnt) 1569 { 1570 /* 1571 * 0x90 is an X86 NOP instruction in both 32 and 64-bit worlds. 1572 * There are no alignment constraints. 1573 */ 1574 (void) memset(off + (char *)base, 0x90, cnt); 1575 } 1576 1577 1578 /* 1579 * Return the ld_targ definition for this target. 1580 */ 1581 const Target * 1582 ld_targ_init_x86(void) 1583 { 1584 static const Target _ld_targ = { 1585 { /* Target_mach */ 1586 M_MACH, /* m_mach */ 1587 M_MACHPLUS, /* m_machplus */ 1588 M_FLAGSPLUS, /* m_flagsplus */ 1589 M_CLASS, /* m_class */ 1590 M_DATA, /* m_data */ 1591 1592 M_SEGM_ALIGN, /* m_segm_align */ 1593 M_SEGM_ORIGIN, /* m_segm_origin */ 1594 M_SEGM_AORIGIN, /* m_segm_aorigin */ 1595 M_DATASEG_PERM, /* m_dataseg_perm */ 1596 M_STACK_PERM, /* m_stack_perm */ 1597 M_WORD_ALIGN, /* m_word_align */ 1598 MSG_ORIG(MSG_PTH_RTLD), /* m_def_interp */ 1599 1600 /* Relocation type codes */ 1601 M_R_ARRAYADDR, /* m_r_arrayaddr */ 1602 M_R_COPY, /* m_r_copy */ 1603 M_R_GLOB_DAT, /* m_r_glob_dat */ 1604 M_R_JMP_SLOT, /* m_r_jmp_slot */ 1605 M_R_NUM, /* m_r_num */ 1606 M_R_NONE, /* m_r_none */ 1607 M_R_RELATIVE, /* m_r_relative */ 1608 M_R_REGISTER, /* m_r_register */ 1609 1610 /* Relocation related constants */ 1611 M_REL_DT_COUNT, /* m_rel_dt_count */ 1612 M_REL_DT_ENT, /* m_rel_dt_ent */ 1613 M_REL_DT_SIZE, /* m_rel_dt_size */ 1614 M_REL_DT_TYPE, /* m_rel_dt_type */ 1615 M_REL_SHT_TYPE, /* m_rel_sht_type */ 1616 1617 /* GOT related constants */ 1618 M_GOT_ENTSIZE, /* m_got_entsize */ 1619 M_GOT_XNumber, /* m_got_xnumber */ 1620 1621 /* PLT related constants */ 1622 M_PLT_ALIGN, /* m_plt_align */ 1623 M_PLT_ENTSIZE, /* m_plt_entsize */ 1624 M_PLT_RESERVSZ, /* m_plt_reservsz */ 1625 M_PLT_SHF_FLAGS, /* m_plt_shf_flags */ 1626 1627 /* Section type of .eh_frame/.eh_frame_hdr sections */ 1628 SHT_PROGBITS, /* m_sht_unwind */ 1629 1630 M_DT_REGISTER, /* m_dt_register */ 1631 }, 1632 { /* Target_machid */ 1633 M_ID_ARRAY, /* id_array */ 1634 M_ID_BSS, /* id_bss */ 1635 M_ID_CAP, /* id_cap */ 1636 M_ID_CAPINFO, /* id_capinfo */ 1637 M_ID_CAPCHAIN, /* id_capchain */ 1638 M_ID_DATA, /* id_data */ 1639 M_ID_DYNAMIC, /* id_dynamic */ 1640 M_ID_DYNSORT, /* id_dynsort */ 1641 M_ID_DYNSTR, /* id_dynstr */ 1642 M_ID_DYNSYM, /* id_dynsym */ 1643 M_ID_DYNSYM_NDX, /* id_dynsym_ndx */ 1644 M_ID_GOT, /* id_got */ 1645 M_ID_UNKNOWN, /* id_gotdata (unused) */ 1646 M_ID_HASH, /* id_hash */ 1647 M_ID_INTERP, /* id_interp */ 1648 M_ID_LBSS, /* id_lbss */ 1649 M_ID_LDYNSYM, /* id_ldynsym */ 1650 M_ID_NOTE, /* id_note */ 1651 M_ID_NULL, /* id_null */ 1652 M_ID_PLT, /* id_plt */ 1653 M_ID_REL, /* id_rel */ 1654 M_ID_STRTAB, /* id_strtab */ 1655 M_ID_SYMINFO, /* id_syminfo */ 1656 M_ID_SYMTAB, /* id_symtab */ 1657 M_ID_SYMTAB_NDX, /* id_symtab_ndx */ 1658 M_ID_TEXT, /* id_text */ 1659 M_ID_TLS, /* id_tls */ 1660 M_ID_TLSBSS, /* id_tlsbss */ 1661 M_ID_UNKNOWN, /* id_unknown */ 1662 M_ID_UNWIND, /* id_unwind */ 1663 M_ID_UNWINDHDR, /* id_unwindhdr */ 1664 M_ID_USER, /* id_user */ 1665 M_ID_VERSION, /* id_version */ 1666 }, 1667 { /* Target_nullfunc */ 1668 nullfunc_tmpl, /* nf_template */ 1669 sizeof (nullfunc_tmpl), /* nf_size */ 1670 }, 1671 { /* Target_fillfunc */ 1672 execfill /* ff_execfill */ 1673 }, 1674 { /* Target_machrel */ 1675 reloc_table, 1676 1677 ld_init_rel, /* mr_init_rel */ 1678 ld_mach_eflags, /* mr_mach_eflags */ 1679 ld_mach_make_dynamic, /* mr_mach_make_dynamic */ 1680 ld_mach_update_odynamic, /* mr_mach_update_odynamic */ 1681 ld_calc_plt_addr, /* mr_calc_plt_addr */ 1682 ld_perform_outreloc, /* mr_perform_outreloc */ 1683 ld_do_activerelocs, /* mr_do_activerelocs */ 1684 ld_add_outrel, /* mr_add_outrel */ 1685 NULL, /* mr_reloc_register */ 1686 ld_reloc_local, /* mr_reloc_local */ 1687 NULL, /* mr_reloc_GOTOP */ 1688 ld_reloc_TLS, /* mr_reloc_TLS */ 1689 NULL, /* mr_assign_got */ 1690 ld_find_got_ndx, /* mr_find_got_ndx */ 1691 ld_calc_got_offset, /* mr_calc_got_offset */ 1692 ld_assign_got_ndx, /* mr_assign_got_ndx */ 1693 ld_assign_plt_ndx, /* mr_assign_plt_ndx */ 1694 NULL, /* mr_allocate_got */ 1695 ld_fillin_gotplt, /* mr_fillin_gotplt */ 1696 }, 1697 { /* Target_machsym */ 1698 NULL, /* ms_reg_check */ 1699 NULL, /* ms_mach_sym_typecheck */ 1700 NULL, /* ms_is_regsym */ 1701 NULL, /* ms_reg_find */ 1702 NULL /* ms_reg_enter */ 1703 } 1704 }; 1705 1706 return (&_ld_targ); 1707 } 1708