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 2007 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <string.h> 33 #include <stdio.h> 34 #include <sys/elf_386.h> 35 #include <debug.h> 36 #include <reloc.h> 37 #include "msg.h" 38 #include "_libld.h" 39 40 Word 41 ld_init_rel(Rel_desc *reld, void *reloc) 42 { 43 Rel * rel = (Rel *)reloc; 44 45 /* LINTED */ 46 reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info); 47 reld->rel_roffset = rel->r_offset; 48 reld->rel_raddend = 0; 49 reld->rel_typedata = 0; 50 51 return ((Word)ELF_R_SYM(rel->r_info)); 52 } 53 54 void 55 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl) 56 { 57 ofl->ofl_dehdr->e_flags |= ehdr->e_flags; 58 } 59 60 void 61 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt) 62 { 63 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) { 64 /* 65 * Create this entry if we are going to create a PLT table. 66 */ 67 if (ofl->ofl_pltcnt) 68 (*cnt)++; /* DT_PLTGOT */ 69 } 70 } 71 72 void 73 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn) 74 { 75 if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) { 76 (*dyn)->d_tag = DT_PLTGOT; 77 if (ofl->ofl_osgot) 78 (*dyn)->d_un.d_ptr = ofl->ofl_osgot->os_shdr->sh_addr; 79 else 80 (*dyn)->d_un.d_ptr = 0; 81 (*dyn)++; 82 } 83 } 84 85 Xword 86 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 87 { 88 Xword value; 89 90 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 91 M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * M_PLT_ENTSIZE); 92 return (value); 93 } 94 95 /* 96 * Build a single plt entry - code is: 97 * if (building a.out) 98 * JMP *got_off 99 * else 100 * JMP *got_off@GOT(%ebx) 101 * PUSHL &rel_off 102 * JMP -n(%pc) # -n is pcrel offset to first plt entry 103 * 104 * The got_off@GOT entry gets filled with the address of the PUSHL, 105 * so the first pass through the plt jumps back here, jumping 106 * in turn to the first plt entry, which jumps to the dynamic 107 * linker. The dynamic linker then patches the GOT, rerouting 108 * future plt calls to the proper destination. 109 */ 110 static void 111 plt_entry(Ofl_desc * ofl, Word rel_off, Sym_desc * sdp) 112 { 113 uchar_t *pltent, *gotent; 114 Sword plt_off; 115 Word got_off; 116 117 got_off = sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE; 118 plt_off = M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * 119 M_PLT_ENTSIZE); 120 pltent = (uchar_t *)(ofl->ofl_osplt->os_outdata->d_buf) + plt_off; 121 gotent = (uchar_t *)(ofl->ofl_osgot->os_outdata->d_buf) + got_off; 122 123 /* 124 * Fill in the got entry with the address of the next instruction. 125 */ 126 /* LINTED */ 127 *(Word *)gotent = ofl->ofl_osplt->os_shdr->sh_addr + plt_off + 128 M_PLT_INSSIZE; 129 130 if (!(ofl->ofl_flags & FLG_OF_SHAROBJ)) { 131 pltent[0] = M_SPECIAL_INST; 132 pltent[1] = M_JMP_DISP_IND; 133 pltent += 2; 134 /* LINTED */ 135 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->sh_addr + 136 got_off); 137 } else { 138 pltent[0] = M_SPECIAL_INST; 139 pltent[1] = M_JMP_REG_DISP_IND; 140 pltent += 2; 141 /* LINTED */ 142 *(Word *)pltent = (Word)got_off; 143 } 144 pltent += 4; 145 146 pltent[0] = M_INST_PUSHL; 147 pltent++; 148 /* LINTED */ 149 *(Word *)pltent = (Word)rel_off; 150 pltent += 4; 151 152 plt_off = -(plt_off + 16); /* JMP, PUSHL, JMP take 16 bytes */ 153 pltent[0] = M_INST_JMP; 154 pltent++; 155 /* LINTED */ 156 *(Word *)pltent = (Word)plt_off; 157 } 158 159 uintptr_t 160 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl) 161 { 162 Os_desc * relosp, * osp = 0; 163 Word ndx, roffset, value; 164 Rel rea; 165 char *relbits; 166 Sym_desc * sdp, * psym = (Sym_desc *)0; 167 int sectmoved = 0; 168 169 sdp = orsp->rel_sym; 170 171 /* 172 * If the section this relocation is against has been discarded 173 * (-zignore), then also discard (skip) the relocation itself. 174 */ 175 if (orsp->rel_isdesc && ((orsp->rel_flags & 176 (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) && 177 (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) { 178 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp)); 179 return (1); 180 } 181 182 /* 183 * If this is a relocation against a move table, or expanded move 184 * table, adjust the relocation entries. 185 */ 186 if (orsp->rel_move) 187 ld_adj_movereloc(ofl, orsp); 188 189 /* 190 * If this is a relocation against a section using a partial initialized 191 * symbol, adjust the embedded symbol info. 192 * 193 * The second argument of the am_I_partial() is the value stored at the 194 * target address relocation is going to be applied. 195 */ 196 if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) { 197 if (ofl->ofl_parsym.head && 198 (sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 199 /* LINTED */ 200 (psym = ld_am_I_partial(orsp, *(Xword *) 201 ((uchar_t *)(orsp->rel_isdesc->is_indata->d_buf) + 202 orsp->rel_roffset)))) { 203 DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym)); 204 sectmoved = 1; 205 } 206 } 207 208 value = sdp->sd_sym->st_value; 209 210 if (orsp->rel_flags & FLG_REL_GOT) { 211 osp = ofl->ofl_osgot; 212 roffset = (Word)ld_calc_got_offset(orsp, ofl); 213 214 } else if (orsp->rel_flags & FLG_REL_PLT) { 215 /* 216 * Note that relocations for PLT's actually 217 * cause a relocation againt the GOT. 218 */ 219 osp = ofl->ofl_osplt; 220 roffset = (Word) (ofl->ofl_osgot->os_shdr->sh_addr) + 221 sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE; 222 223 plt_entry(ofl, osp->os_relosdesc->os_szoutrels, sdp); 224 225 } else if (orsp->rel_flags & FLG_REL_BSS) { 226 /* 227 * This must be a R_386_COPY. For these set the roffset to 228 * point to the new symbols location. 229 */ 230 osp = ofl->ofl_isbss->is_osdesc; 231 roffset = (Word)value; 232 } else { 233 osp = orsp->rel_osdesc; 234 235 /* 236 * Calculate virtual offset of reference point; equals offset 237 * into section + vaddr of section for loadable sections, or 238 * offset plus section displacement for nonloadable sections. 239 */ 240 roffset = orsp->rel_roffset + 241 (Off)_elf_getxoff(orsp->rel_isdesc->is_indata); 242 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) 243 roffset += orsp->rel_isdesc->is_osdesc-> 244 os_shdr->sh_addr; 245 } 246 247 if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0)) 248 relosp = ofl->ofl_osrel; 249 250 /* 251 * Assign the symbols index for the output relocation. If the 252 * relocation refers to a SECTION symbol then it's index is based upon 253 * the output sections symbols index. Otherwise the index can be 254 * derived from the symbols index itself. 255 */ 256 if (orsp->rel_rtype == R_386_RELATIVE) 257 ndx = STN_UNDEF; 258 else if ((orsp->rel_flags & FLG_REL_SCNNDX) || 259 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) { 260 if (sectmoved == 0) { 261 /* 262 * Check for a null input section. This can 263 * occur if this relocation references a symbol 264 * generated by sym_add_sym(). 265 */ 266 if ((sdp->sd_isc != 0) && 267 (sdp->sd_isc->is_osdesc != 0)) 268 ndx = sdp->sd_isc->is_osdesc->os_scnsymndx; 269 else 270 ndx = sdp->sd_shndx; 271 } else 272 ndx = ofl->ofl_sunwdata1ndx; 273 } else 274 ndx = sdp->sd_symndx; 275 276 relbits = (char *)relosp->os_outdata->d_buf; 277 278 rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype); 279 rea.r_offset = roffset; 280 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_REL, &rea, relosp->os_name, 281 orsp->rel_sname)); 282 283 /* 284 * Assert we haven't walked off the end of our relocation table. 285 */ 286 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 287 288 (void) memcpy((relbits + relosp->os_szoutrels), 289 (char *)&rea, sizeof (Rel)); 290 relosp->os_szoutrels += sizeof (Rel); 291 292 /* 293 * Determine if this relocation is against a non-writable, allocatable 294 * section. If so we may need to provide a text relocation diagnostic. 295 * Note that relocations against the .plt (R_386_JMP_SLOT) actually 296 * result in modifications to the .got. 297 */ 298 if (orsp->rel_rtype == R_386_JMP_SLOT) 299 osp = ofl->ofl_osgot; 300 301 ld_reloc_remain_entry(orsp, osp, ofl); 302 return (1); 303 } 304 305 /* 306 * i386 Instructions for TLS processing 307 */ 308 static uchar_t tlsinstr_gd_ie[] = { 309 /* 310 * 0x00 movl %gs:0x0, %eax 311 */ 312 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, 313 /* 314 * 0x06 addl x(%eax), %eax 315 * 0x0c ... 316 */ 317 0x03, 0x80, 0x00, 0x00, 0x00, 0x00 318 }; 319 320 static uchar_t tlsinstr_gd_le[] = { 321 /* 322 * 0x00 movl %gs:0x0, %eax 323 */ 324 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, 325 /* 326 * 0x06 addl $0x0, %eax 327 */ 328 0x05, 0x00, 0x00, 0x00, 0x00, 329 /* 330 * 0x0b nop 331 * 0x0c 332 */ 333 0x90 334 }; 335 336 static uchar_t tlsinstr_gd_ie_movgs[] = { 337 /* 338 * movl %gs:0x0,%eax 339 */ 340 0x65, 0xa1, 0x00, 0x00, 0x00, 00 341 }; 342 343 #define TLS_GD_IE_MOV 0x8b /* movl opcode */ 344 #define TLS_GD_IE_POP 0x58 /* popl + reg */ 345 346 #define TLS_GD_LE_MOVL 0xb8 /* movl + reg */ 347 348 #define TLS_NOP 0x90 /* NOP instruction */ 349 350 #define MODRM_MSK_MOD 0xc0 351 #define MODRM_MSK_RO 0x38 352 #define MODRM_MSK_RM 0x07 353 354 #define SIB_MSK_SS 0xc0 355 #define SIB_MSK_IND 0x38 356 #define SIB_MSK_BS 0x07 357 358 static Fixupret 359 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp) 360 { 361 Sym_desc *sdp = arsp->rel_sym; 362 Word rtype = arsp->rel_rtype; 363 uchar_t *offset, r1, r2; 364 365 offset = (uchar_t *)((uintptr_t)arsp->rel_roffset + 366 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) + 367 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 368 369 if (sdp->sd_ref == REF_DYN_NEED) { 370 /* 371 * IE reference model 372 */ 373 switch (rtype) { 374 case R_386_TLS_GD: 375 /* 376 * Transition: 377 * 0x0 leal x@tlsgd(,r1,1), %eax 378 * 0x7 call ___tls_get_addr 379 * 0xc 380 * To: 381 * 0x0 movl %gs:0, %eax 382 * 0x6 addl x@gotntpoff(r1), %eax 383 */ 384 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 385 R_386_TLS_GOTIE, arsp)); 386 arsp->rel_rtype = R_386_TLS_GOTIE; 387 arsp->rel_roffset += 5; 388 389 /* 390 * Adjust 'offset' to beginning of instruction 391 * sequence. 392 */ 393 offset -= 3; 394 r1 = (offset[2] & SIB_MSK_IND) >> 3; 395 (void) memcpy(offset, tlsinstr_gd_ie, 396 sizeof (tlsinstr_gd_ie)); 397 398 /* 399 * set register %r1 into the addl 400 * instruction. 401 */ 402 offset[0x7] |= r1; 403 return (FIX_RELOC); 404 405 case R_386_TLS_GD_PLT: 406 /* 407 * Fixup done via the TLS_GD relocation 408 */ 409 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 410 R_386_NONE, arsp)); 411 return (FIX_DONE); 412 } 413 } 414 415 /* 416 * LE reference model 417 */ 418 switch (rtype) { 419 case R_386_TLS_GD: 420 /* 421 * Transition: 422 * 0x0 leal x@tlsgd(,r1,1), %eax 423 * 0x7 call ___tls_get_addr 424 * 0xc 425 * To: 426 * 0x0 movl %gs:0, %eax 427 * 0x6 addl $x@ntpoff, %eax 428 * 0xb nop 429 * 0xc 430 */ 431 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 432 R_386_TLS_LE, arsp)); 433 434 arsp->rel_rtype = R_386_TLS_LE; 435 arsp->rel_roffset += 4; 436 437 /* 438 * Adjust 'offset' to beginning of instruction 439 * sequence. 440 */ 441 offset -= 3; 442 (void) memcpy(offset, tlsinstr_gd_le, 443 sizeof (tlsinstr_gd_le)); 444 return (FIX_RELOC); 445 446 case R_386_TLS_GD_PLT: 447 case R_386_PLT32: 448 /* 449 * Fixup done via the TLS_GD relocation 450 */ 451 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 452 R_386_NONE, arsp)); 453 return (FIX_DONE); 454 455 case R_386_TLS_LDM_PLT: 456 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 457 R_386_NONE, arsp)); 458 459 /* 460 * Transition: 461 * call __tls_get_addr() 462 * to: 463 * nop 464 * nop 465 * nop 466 * nop 467 * nop 468 */ 469 *(offset - 1) = TLS_NOP; 470 *(offset) = TLS_NOP; 471 *(offset + 1) = TLS_NOP; 472 *(offset + 2) = TLS_NOP; 473 *(offset + 3) = TLS_NOP; 474 return (FIX_DONE); 475 476 case R_386_TLS_LDM: 477 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 478 R_386_NONE, arsp)); 479 480 /* 481 * Transition: 482 * 483 * 0x00 leal x1@tlsldm(%ebx), %eax 484 * 0x06 call ___tls_get_addr 485 * 486 * to: 487 * 488 * 0x00 movl %gs:0, %eax 489 */ 490 (void) memcpy(offset - 2, tlsinstr_gd_ie_movgs, 491 sizeof (tlsinstr_gd_ie_movgs)); 492 return (FIX_DONE); 493 494 case R_386_TLS_LDO_32: 495 /* 496 * Instructions: 497 * 498 * 0x10 leal x1@dtpoff(%eax), %edx R_386_TLS_LDO_32 499 * to 500 * 0x10 leal x1@ntpoff(%eax), %edx R_386_TLS_LE 501 * 502 */ 503 offset -= 2; 504 505 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 506 R_386_TLS_LE, arsp)); 507 arsp->rel_rtype = R_386_TLS_LE; 508 return (FIX_RELOC); 509 510 case R_386_TLS_GOTIE: 511 /* 512 * These transitions are a little different than the 513 * others, in that we could have multiple instructions 514 * pointed to by a single relocation. Depending upon the 515 * instruction, we perform a different code transition. 516 * 517 * Here's the known transitions: 518 * 519 * 1) movl foo@gotntpoff(%reg1), %reg2 520 * 0x8b, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 521 * 522 * 2) addl foo@gotntpoff(%reg1), %reg2 523 * 0x03, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 524 * 525 * Transitions IE -> LE 526 * 527 * 1) movl $foo@ntpoff, %reg2 528 * 0xc7, 0xc0 | reg2, foo@ntpoff 529 * 530 * 2) addl $foo@ntpoff, %reg2 531 * 0x81, 0xc0 | reg2, foo@ntpoff 532 * 533 * Note: reg1 != 4 (%esp) 534 */ 535 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 536 R_386_TLS_LE, arsp)); 537 arsp->rel_rtype = R_386_TLS_LE; 538 539 offset -= 2; 540 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 541 if (offset[0] == 0x8b) { 542 /* case 1 above */ 543 offset[0] = 0xc7; /* movl */ 544 offset[1] = 0xc0 | r2; 545 return (FIX_RELOC); 546 } 547 548 if (offset[0] == 0x03) { 549 /* case 2 above */ 550 assert(offset[0] == 0x03); 551 offset[0] = 0x81; /* addl */ 552 offset[1] = 0xc0 | r2; 553 return (FIX_RELOC); 554 } 555 556 /* 557 * Unexpected instruction sequence - fatal error. 558 */ 559 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS), 560 conv_reloc_386_type(arsp->rel_rtype, 0), 561 arsp->rel_isdesc->is_file->ifl_name, 562 demangle(arsp->rel_sname), arsp->rel_isdesc->is_name, 563 EC_OFF(arsp->rel_roffset)); 564 return (FIX_ERROR); 565 566 case R_386_TLS_IE: 567 /* 568 * These transitions are a little different than the 569 * others, in that we could have multiple instructions 570 * pointed to by a single relocation. Depending upon the 571 * instruction, we perform a different code transition. 572 * 573 * Here's the known transitions: 574 * 1) movl foo@indntpoff, %eax 575 * 0xa1, foo@indntpoff 576 * 577 * 2) movl foo@indntpoff, %eax 578 * 0x8b, 0x05 | (reg << 3), foo@gotntpoff 579 * 580 * 3) addl foo@indntpoff, %eax 581 * 0x03, 0x05 | (reg << 3), foo@gotntpoff 582 * 583 * Transitions IE -> LE 584 * 585 * 1) movl $foo@ntpoff, %eax 586 * 0xb8, foo@ntpoff 587 * 588 * 2) movl $foo@ntpoff, %reg 589 * 0xc7, 0xc0 | reg, foo@ntpoff 590 * 591 * 3) addl $foo@ntpoff, %reg 592 * 0x81, 0xc0 | reg, foo@ntpoff 593 */ 594 arsp->rel_rtype = R_386_TLS_LE; 595 offset--; 596 if (offset[0] == 0xa1) { 597 /* case 1 above */ 598 offset[0] = 0xb8; /* movl */ 599 return (FIX_RELOC); 600 } 601 602 offset--; 603 if (offset[0] == 0x8b) { 604 /* case 2 above */ 605 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 606 offset[0] = 0xc7; /* movl */ 607 offset[1] = 0xc0 | r2; 608 return (FIX_RELOC); 609 } 610 if (offset[0] == 0x03) { 611 /* case 3 above */ 612 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 613 offset[0] = 0x81; /* addl */ 614 offset[1] = 0xc0 | r2; 615 return (FIX_RELOC); 616 } 617 /* 618 * Unexpected instruction sequence - fatal error. 619 */ 620 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS), 621 conv_reloc_386_type(arsp->rel_rtype, 0), 622 arsp->rel_isdesc->is_file->ifl_name, 623 demangle(arsp->rel_sname), arsp->rel_isdesc->is_name, 624 EC_OFF(arsp->rel_roffset)); 625 return (FIX_ERROR); 626 } 627 return (FIX_RELOC); 628 } 629 630 uintptr_t 631 ld_do_activerelocs(Ofl_desc *ofl) 632 { 633 Rel_desc *arsp; 634 Rel_cache *rcp; 635 Listnode *lnp; 636 uintptr_t return_code = 1; 637 Word flags = ofl->ofl_flags; 638 Word dtflags1 = ofl->ofl_dtflags_1; 639 640 if (ofl->ofl_actrels.head) 641 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 642 643 /* 644 * Process active relocations. 645 */ 646 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 647 /* LINTED */ 648 for (arsp = (Rel_desc *)(rcp + 1); 649 arsp < rcp->rc_free; arsp++) { 650 uchar_t *addr; 651 Xword value; 652 Sym_desc *sdp; 653 const char *ifl_name; 654 Xword refaddr; 655 int moved = 0; 656 Gotref gref; 657 658 /* 659 * If the section this relocation is against has been 660 * discarded (-zignore), then discard (skip) the 661 * relocation itself. 662 */ 663 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 664 ((arsp->rel_flags & 665 (FLG_REL_GOT | FLG_REL_BSS | 666 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 667 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 668 M_MACH, arsp)); 669 continue; 670 } 671 672 /* 673 * We deteremine what the 'got reference' 674 * model (if required) is at this point. This 675 * needs to be done before tls_fixup() since 676 * it may 'transition' our instructions. 677 * 678 * The got table entries have already been assigned, 679 * and we bind to those initial entries. 680 */ 681 if (arsp->rel_flags & FLG_REL_DTLS) 682 gref = GOT_REF_TLSGD; 683 else if (arsp->rel_flags & FLG_REL_MTLS) 684 gref = GOT_REF_TLSLD; 685 else if (arsp->rel_flags & FLG_REL_STLS) 686 gref = GOT_REF_TLSIE; 687 else 688 gref = GOT_REF_GENERIC; 689 690 /* 691 * Perform any required TLS fixups. 692 */ 693 if (arsp->rel_flags & FLG_REL_TLSFIX) { 694 Fixupret ret; 695 696 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 697 return (S_ERROR); 698 if (ret == FIX_DONE) 699 continue; 700 } 701 702 /* 703 * If this is a relocation against a move table, or 704 * expanded move table, adjust the relocation entries. 705 */ 706 if (arsp->rel_move) 707 ld_adj_movereloc(ofl, arsp); 708 709 sdp = arsp->rel_sym; 710 refaddr = arsp->rel_roffset + 711 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 712 713 if (arsp->rel_flags & FLG_REL_CLVAL) 714 value = 0; 715 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 716 STT_SECTION) { 717 Sym_desc *sym; 718 719 /* 720 * The value for a symbol pointing to a SECTION 721 * is based off of that sections position. 722 * 723 * The second argument of the ld_am_I_partial() 724 * is the value stored at the target address 725 * relocation is going to be applied. 726 */ 727 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 728 /* LINTED */ 729 (sym = ld_am_I_partial(arsp, *(Xword *) 730 ((uchar_t *) 731 arsp->rel_isdesc->is_indata->d_buf + 732 arsp->rel_roffset)))) { 733 /* 734 * If the symbol is moved, 735 * adjust the value 736 */ 737 value = sym->sd_sym->st_value; 738 moved = 1; 739 } else { 740 value = _elf_getxoff( 741 sdp->sd_isc->is_indata); 742 if (sdp->sd_isc->is_shdr->sh_flags & 743 SHF_ALLOC) 744 value += sdp->sd_isc-> 745 is_osdesc->os_shdr->sh_addr; 746 } 747 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 748 value -= ofl->ofl_tlsphdr->p_vaddr; 749 750 } else if (IS_SIZE(arsp->rel_rtype)) { 751 /* 752 * Size relocations require the symbols size. 753 */ 754 value = sdp->sd_sym->st_size; 755 } else { 756 /* 757 * Else the value is the symbols value. 758 */ 759 value = sdp->sd_sym->st_value; 760 } 761 762 /* 763 * Relocation against the GLOBAL_OFFSET_TABLE. 764 */ 765 if (arsp->rel_flags & FLG_REL_GOT) 766 arsp->rel_osdesc = ofl->ofl_osgot; 767 768 /* 769 * If loadable and not producing a relocatable object 770 * add the sections virtual address to the reference 771 * address. 772 */ 773 if ((arsp->rel_flags & FLG_REL_LOAD) && 774 ((flags & FLG_OF_RELOBJ) == 0)) 775 refaddr += arsp->rel_isdesc->is_osdesc-> 776 os_shdr->sh_addr; 777 778 /* 779 * If this entry has a PLT assigned to it, it's 780 * value is actually the address of the PLT (and 781 * not the address of the function). 782 */ 783 if (IS_PLT(arsp->rel_rtype)) { 784 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 785 value = ld_calc_plt_addr(sdp, ofl); 786 } 787 788 /* 789 * Determine whether the value needs further adjustment. 790 * Filter through the attributes of the relocation to 791 * determine what adjustment is required. Note, many 792 * of the following cases are only applicable when a 793 * .got is present. As a .got is not generated when a 794 * relocatable object is being built, any adjustments 795 * that require a .got need to be skipped. 796 */ 797 if ((arsp->rel_flags & FLG_REL_GOT) && 798 ((flags & FLG_OF_RELOBJ) == 0)) { 799 Xword R1addr; 800 uintptr_t R2addr; 801 Word gotndx; 802 Gotndx *gnp; 803 804 /* 805 * Perform relocation against GOT table. Since 806 * this doesn't fit exactly into a relocation 807 * we place the appropriate byte in the GOT 808 * directly 809 * 810 * Calculate offset into GOT at which to apply 811 * the relocation. 812 */ 813 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 814 ofl, 0); 815 assert(gnp); 816 817 if (arsp->rel_rtype == R_386_TLS_DTPOFF32) 818 gotndx = gnp->gn_gotndx + 1; 819 else 820 gotndx = gnp->gn_gotndx; 821 822 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE); 823 824 /* 825 * Add the GOTs data's offset. 826 */ 827 R2addr = R1addr + (uintptr_t) 828 arsp->rel_osdesc->os_outdata->d_buf; 829 830 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 831 ELF_DBG_LD, M_MACH, SHT_REL, 832 arsp->rel_rtype, R1addr, value, 833 arsp->rel_sname, arsp->rel_osdesc)); 834 835 /* 836 * And do it. 837 */ 838 *(Xword *)R2addr = value; 839 continue; 840 841 } else if (IS_GOT_BASED(arsp->rel_rtype) && 842 ((flags & FLG_OF_RELOBJ) == 0)) { 843 value -= ofl->ofl_osgot->os_shdr->sh_addr; 844 845 } else if (IS_GOT_PC(arsp->rel_rtype) && 846 ((flags & FLG_OF_RELOBJ) == 0)) { 847 value = 848 (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) - 849 refaddr; 850 851 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) && 852 (((flags & FLG_OF_RELOBJ) == 0) || 853 (arsp->rel_osdesc == sdp->sd_isc->is_osdesc))) { 854 value -= refaddr; 855 856 } else if (IS_TLS_INS(arsp->rel_rtype) && 857 IS_GOT_RELATIVE(arsp->rel_rtype) && 858 ((flags & FLG_OF_RELOBJ) == 0)) { 859 Gotndx *gnp; 860 861 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 862 ofl, 0); 863 assert(gnp); 864 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 865 if (arsp->rel_rtype == R_386_TLS_IE) { 866 value += 867 ofl->ofl_osgot->os_shdr->sh_addr; 868 } 869 870 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 871 ((flags & FLG_OF_RELOBJ) == 0)) { 872 Gotndx *gnp; 873 874 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 875 GOT_REF_GENERIC, ofl, 0); 876 assert(gnp); 877 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 878 879 } else if ((arsp->rel_flags & FLG_REL_STLS) && 880 ((flags & FLG_OF_RELOBJ) == 0)) { 881 Xword tlsstatsize; 882 883 /* 884 * This is the LE TLS reference model. Static 885 * offset is hard-coded. 886 */ 887 tlsstatsize = 888 S_ROUND(ofl->ofl_tlsphdr->p_memsz, 889 M_TLSSTATALIGN); 890 value = tlsstatsize - value; 891 892 /* 893 * Since this code is fixed up, it assumes a 894 * negative offset that can be added to the 895 * thread pointer. 896 */ 897 if ((arsp->rel_rtype == R_386_TLS_LDO_32) || 898 (arsp->rel_rtype == R_386_TLS_LE)) 899 value = -value; 900 } 901 902 if (arsp->rel_isdesc->is_file) 903 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 904 else 905 ifl_name = MSG_INTL(MSG_STR_NULL); 906 907 /* 908 * Make sure we have data to relocate. Compiler and 909 * assembler developers have been known to generate 910 * relocations against invalid sections (normally .bss), 911 * so for their benefit give them sufficient information 912 * to help analyze the problem. End users should never 913 * see this. 914 */ 915 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 916 eprintf(ofl->ofl_lml, ERR_FATAL, 917 MSG_INTL(MSG_REL_EMPTYSEC), 918 conv_reloc_386_type(arsp->rel_rtype, 0), 919 ifl_name, demangle(arsp->rel_sname), 920 arsp->rel_isdesc->is_name); 921 return (S_ERROR); 922 } 923 924 /* 925 * Get the address of the data item we need to modify. 926 */ 927 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 928 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 929 is_indata)); 930 931 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 932 M_MACH, SHT_REL, arsp->rel_rtype, EC_NATPTR(addr), 933 value, arsp->rel_sname, arsp->rel_osdesc)); 934 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 935 936 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 937 ofl->ofl_size) || (arsp->rel_roffset > 938 arsp->rel_osdesc->os_shdr->sh_size)) { 939 int class; 940 941 if (((uintptr_t)addr - 942 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 943 class = ERR_FATAL; 944 else 945 class = ERR_WARNING; 946 947 eprintf(ofl->ofl_lml, class, 948 MSG_INTL(MSG_REL_INVALOFFSET), 949 conv_reloc_386_type(arsp->rel_rtype, 0), 950 ifl_name, arsp->rel_isdesc->is_name, 951 demangle(arsp->rel_sname), 952 EC_ADDR((uintptr_t)addr - 953 (uintptr_t)ofl->ofl_nehdr)); 954 955 if (class == ERR_FATAL) { 956 return_code = S_ERROR; 957 continue; 958 } 959 } 960 961 /* 962 * The relocation is additive. Ignore the previous 963 * symbol value if this local partial symbol is 964 * expanded. 965 */ 966 if (moved) 967 value -= *addr; 968 969 /* 970 * If '-z noreloc' is specified - skip the do_reloc 971 * stage. 972 */ 973 if ((flags & FLG_OF_RELOBJ) || 974 !(dtflags1 & DF_1_NORELOC)) { 975 if (do_reloc((uchar_t)arsp->rel_rtype, addr, 976 &value, arsp->rel_sname, ifl_name, 977 ofl->ofl_lml) == 0) 978 return_code = S_ERROR; 979 } 980 } 981 } 982 return (return_code); 983 } 984 985 /* 986 * Add an output relocation record. 987 */ 988 uintptr_t 989 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 990 { 991 Rel_desc *orsp; 992 Rel_cache *rcp; 993 Sym_desc *sdp = rsp->rel_sym; 994 995 /* 996 * Static executables *do not* want any relocations against them. 997 * Since our engine still creates relocations against a WEAK UNDEFINED 998 * symbol in a static executable, it's best to disable them here 999 * instead of through out the relocation code. 1000 */ 1001 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 1002 (FLG_OF_STATIC | FLG_OF_EXEC)) 1003 return (1); 1004 1005 /* 1006 * If no relocation cache structures are available allocate 1007 * a new one and link it into the cache list. 1008 */ 1009 if ((ofl->ofl_outrels.tail == 0) || 1010 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1011 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1012 static size_t nextsize = 0; 1013 size_t size; 1014 1015 /* 1016 * Output relocation numbers can vary considerably between 1017 * building executables or shared objects (pic vs. non-pic), 1018 * etc. But, they typically aren't very large, so for these 1019 * objects use a standard bucket size. For building relocatable 1020 * objects, typically there will be an output relocation for 1021 * every input relocation. 1022 */ 1023 if (nextsize == 0) { 1024 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1025 if ((size = ofl->ofl_relocincnt) == 0) 1026 size = REL_LOIDESCNO; 1027 if (size > REL_HOIDESCNO) 1028 nextsize = REL_HOIDESCNO; 1029 else 1030 nextsize = REL_LOIDESCNO; 1031 } else 1032 nextsize = size = REL_HOIDESCNO; 1033 } else 1034 size = nextsize; 1035 1036 size = size * sizeof (Rel_desc); 1037 1038 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1039 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1040 return (S_ERROR); 1041 1042 /* LINTED */ 1043 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1044 /* LINTED */ 1045 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1046 } 1047 1048 /* 1049 * If we are adding a output relocation against a section 1050 * symbol (non-RELATIVE) then mark that section. These sections 1051 * will be added to the .dynsym symbol table. 1052 */ 1053 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1054 ((flags & FLG_REL_SCNNDX) || 1055 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1056 1057 /* 1058 * If this is a COMMON symbol - no output section 1059 * exists yet - (it's created as part of sym_validate()). 1060 * So - we mark here that when it's created it should 1061 * be tagged with the FLG_OS_OUTREL flag. 1062 */ 1063 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1064 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1065 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1066 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1067 else 1068 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1069 } else { 1070 Os_desc *osp = sdp->sd_isc->is_osdesc; 1071 1072 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1073 ofl->ofl_dynshdrcnt++; 1074 osp->os_flags |= FLG_OS_OUTREL; 1075 } 1076 } 1077 } 1078 1079 *orsp = *rsp; 1080 orsp->rel_flags |= flags; 1081 1082 rcp->rc_free++; 1083 ofl->ofl_outrelscnt++; 1084 1085 if (flags & FLG_REL_GOT) 1086 ofl->ofl_relocgotsz += (Xword)sizeof (Rel); 1087 else if (flags & FLG_REL_PLT) 1088 ofl->ofl_relocpltsz += (Xword)sizeof (Rel); 1089 else if (flags & FLG_REL_BSS) 1090 ofl->ofl_relocbsssz += (Xword)sizeof (Rel); 1091 else if (flags & FLG_REL_NOINFO) 1092 ofl->ofl_relocrelsz += (Xword)sizeof (Rel); 1093 else 1094 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rel); 1095 1096 if (orsp->rel_rtype == M_R_RELATIVE) 1097 ofl->ofl_relocrelcnt++; 1098 1099 /* 1100 * We don't perform sorting on PLT relocations because 1101 * they have already been assigned a PLT index and if we 1102 * were to sort them we would have to re-assign the plt indexes. 1103 */ 1104 if (!(flags & FLG_REL_PLT)) 1105 ofl->ofl_reloccnt++; 1106 1107 /* 1108 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1109 */ 1110 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1111 ofl->ofl_flags |= FLG_OF_BLDGOT; 1112 1113 /* 1114 * Identify and possibly warn of a displacement relocation. 1115 */ 1116 if (orsp->rel_flags & FLG_REL_DISP) { 1117 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1118 1119 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1120 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1121 } 1122 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL, 1123 M_MACH, orsp)); 1124 return (1); 1125 } 1126 1127 /* 1128 * Stub routine since register symbols are not supported on i386. 1129 */ 1130 /* ARGSUSED */ 1131 uintptr_t 1132 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1133 { 1134 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_NOREG)); 1135 return (S_ERROR); 1136 } 1137 1138 /* 1139 * process relocation for a LOCAL symbol 1140 */ 1141 uintptr_t 1142 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1143 { 1144 Word flags = ofl->ofl_flags; 1145 Sym_desc *sdp = rsp->rel_sym; 1146 Word shndx = sdp->sd_sym->st_shndx; 1147 1148 /* 1149 * if ((shared object) and (not pc relative relocation) and 1150 * (not against ABS symbol)) 1151 * then 1152 * build R_386_RELATIVE 1153 * fi 1154 */ 1155 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1156 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1157 !(IS_GOT_BASED(rsp->rel_rtype)) && 1158 !(rsp->rel_isdesc != NULL && 1159 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1160 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1161 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1162 Word ortype = rsp->rel_rtype; 1163 1164 rsp->rel_rtype = R_386_RELATIVE; 1165 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR) 1166 return (S_ERROR); 1167 rsp->rel_rtype = ortype; 1168 } 1169 1170 /* 1171 * If the relocation is against a 'non-allocatable' section 1172 * and we can not resolve it now - then give a warning 1173 * message. 1174 * 1175 * We can not resolve the symbol if either: 1176 * a) it's undefined 1177 * b) it's defined in a shared library and a 1178 * COPY relocation hasn't moved it to the executable 1179 * 1180 * Note: because we process all of the relocations against the 1181 * text segment before any others - we know whether 1182 * or not a copy relocation will be generated before 1183 * we get here (see reloc_init()->reloc_segments()). 1184 */ 1185 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1186 ((shndx == SHN_UNDEF) || 1187 ((sdp->sd_ref == REF_DYN_NEED) && 1188 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1189 /* 1190 * If the relocation is against a SHT_SUNW_ANNOTATE 1191 * section - then silently ignore that the relocation 1192 * can not be resolved. 1193 */ 1194 if (rsp->rel_osdesc && 1195 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1196 return (0); 1197 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), 1198 conv_reloc_386_type(rsp->rel_rtype, 0), 1199 rsp->rel_isdesc->is_file->ifl_name, 1200 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1201 return (1); 1202 } 1203 1204 /* 1205 * Perform relocation. 1206 */ 1207 return (ld_add_actrel(NULL, rsp, ofl)); 1208 } 1209 1210 uintptr_t 1211 /* ARGSUSED */ 1212 ld_reloc_GOTOP(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1213 { 1214 /* 1215 * Stub routine for common code compatibility, we shouldn't 1216 * actually get here on x86. 1217 */ 1218 assert(0); 1219 return (S_ERROR); 1220 } 1221 1222 uintptr_t 1223 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1224 { 1225 Word rtype = rsp->rel_rtype; 1226 Sym_desc *sdp = rsp->rel_sym; 1227 Word flags = ofl->ofl_flags; 1228 Gotndx *gnp; 1229 1230 /* 1231 * If we're building an executable - use either the IE or LE access 1232 * model. If we're building a shared object process any IE model. 1233 */ 1234 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1235 /* 1236 * Set the DF_STATIC_TLS flag. 1237 */ 1238 ofl->ofl_dtflags |= DF_STATIC_TLS; 1239 1240 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1241 /* 1242 * Assign a GOT entry for static TLS references. 1243 */ 1244 if ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1245 GOT_REF_TLSIE, ofl, 0)) == 0) { 1246 1247 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1248 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1249 rtype, R_386_TLS_TPOFF, 0) == S_ERROR) 1250 return (S_ERROR); 1251 } 1252 1253 /* 1254 * IE access model. 1255 */ 1256 if (IS_TLS_IE(rtype)) { 1257 if (ld_add_actrel(FLG_REL_STLS, 1258 rsp, ofl) == S_ERROR) 1259 return (S_ERROR); 1260 1261 /* 1262 * A non-pic shared object needs to adjust the 1263 * active relocation (indntpoff). 1264 */ 1265 if (((flags & FLG_OF_EXEC) == 0) && 1266 (rtype == R_386_TLS_IE)) { 1267 rsp->rel_rtype = R_386_RELATIVE; 1268 return (ld_add_outrel(NULL, rsp, ofl)); 1269 } 1270 return (1); 1271 } 1272 1273 /* 1274 * Fixups are required for other executable models. 1275 */ 1276 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1277 rsp, ofl)); 1278 } 1279 1280 /* 1281 * LE access model. 1282 */ 1283 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32)) 1284 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1285 1286 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1287 rsp, ofl)); 1288 } 1289 1290 /* 1291 * Building a shared object. 1292 * 1293 * Assign a GOT entry for a dynamic TLS reference. 1294 */ 1295 if (IS_TLS_LD(rtype) && ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1296 GOT_REF_TLSLD, ofl, 0)) == 0)) { 1297 1298 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1299 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, 0) == S_ERROR) 1300 return (S_ERROR); 1301 1302 } else if (IS_TLS_GD(rtype) && 1303 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1304 ofl, 0)) == 0)) { 1305 1306 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1307 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32, 1308 R_386_TLS_DTPOFF32) == S_ERROR) 1309 return (S_ERROR); 1310 } 1311 1312 /* 1313 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1314 * cause a call to __tls_get_addr(). Convert this relocation to that 1315 * symbol now, and prepare for the PLT magic. 1316 */ 1317 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) { 1318 Sym_desc *tlsgetsym; 1319 1320 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU), 1321 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1322 return (S_ERROR); 1323 1324 rsp->rel_sym = tlsgetsym; 1325 rsp->rel_sname = tlsgetsym->sd_name; 1326 rsp->rel_rtype = R_386_PLT32; 1327 1328 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1329 return (S_ERROR); 1330 1331 rsp->rel_sym = sdp; 1332 rsp->rel_sname = sdp->sd_name; 1333 rsp->rel_rtype = rtype; 1334 return (1); 1335 } 1336 1337 if (IS_TLS_LD(rtype)) 1338 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1339 1340 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1341 } 1342 1343 /* ARGSUSED3 */ 1344 Gotndx * 1345 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1346 { 1347 Listnode * lnp; 1348 Gotndx * gnp; 1349 1350 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1351 return (ofl->ofl_tlsldgotndx); 1352 1353 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1354 if (gnp->gn_gotref == gref) 1355 return (gnp); 1356 } 1357 return ((Gotndx *)0); 1358 } 1359 1360 Xword 1361 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1362 { 1363 Os_desc *osp = ofl->ofl_osgot; 1364 Sym_desc *sdp = rdesc->rel_sym; 1365 Xword gotndx; 1366 Gotref gref; 1367 Gotndx *gnp; 1368 1369 if (rdesc->rel_flags & FLG_REL_DTLS) 1370 gref = GOT_REF_TLSGD; 1371 else if (rdesc->rel_flags & FLG_REL_MTLS) 1372 gref = GOT_REF_TLSLD; 1373 else if (rdesc->rel_flags & FLG_REL_STLS) 1374 gref = GOT_REF_TLSIE; 1375 else 1376 gref = GOT_REF_GENERIC; 1377 1378 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, 0); 1379 assert(gnp); 1380 1381 gotndx = (Xword)gnp->gn_gotndx; 1382 1383 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1384 (rdesc->rel_rtype == R_386_TLS_DTPOFF32)) 1385 gotndx++; 1386 1387 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE))); 1388 } 1389 1390 1391 /* ARGSUSED4 */ 1392 uintptr_t 1393 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1394 Rel_desc * rsp, Sym_desc * sdp) 1395 { 1396 Gotndx *gnp; 1397 uint_t gotents; 1398 1399 if (pgnp) 1400 return (1); 1401 1402 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1403 gotents = 2; 1404 else 1405 gotents = 1; 1406 1407 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 1408 return (S_ERROR); 1409 gnp->gn_gotndx = ofl->ofl_gotcnt; 1410 gnp->gn_gotref = gref; 1411 1412 ofl->ofl_gotcnt += gotents; 1413 1414 if (gref == GOT_REF_TLSLD) { 1415 ofl->ofl_tlsldgotndx = gnp; 1416 return (1); 1417 } 1418 1419 if (list_appendc(lst, (void *)gnp) == 0) 1420 return (S_ERROR); 1421 1422 return (1); 1423 } 1424 1425 void 1426 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 1427 { 1428 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 1429 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++; 1430 ofl->ofl_flags |= FLG_OF_BLDGOT; 1431 } 1432 1433 /* 1434 * Initializes .got[0] with the _DYNAMIC symbol value. 1435 */ 1436 uintptr_t 1437 ld_fillin_gotplt(Ofl_desc *ofl) 1438 { 1439 Word flags = ofl->ofl_flags; 1440 1441 if (ofl->ofl_osgot) { 1442 Sym_desc *sdp; 1443 1444 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 1445 SYM_NOHASH, 0, ofl)) != NULL) { 1446 uchar_t *genptr; 1447 1448 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 1449 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 1450 /* LINTED */ 1451 *(Word *)genptr = (Word)sdp->sd_sym->st_value; 1452 } 1453 } 1454 1455 /* 1456 * Fill in the reserved slot in the procedure linkage table the first 1457 * entry is: 1458 * if (building a.out) { 1459 * PUSHL got[1] # the address of the link map entry 1460 * JMP * got[2] # the address of rtbinder 1461 * } else { 1462 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry 1463 * JMP * got[2]@GOT(%ebx) # the address of rtbinder 1464 * } 1465 */ 1466 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { 1467 uchar_t *pltent; 1468 1469 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 1470 if (!(flags & FLG_OF_SHAROBJ)) { 1471 pltent[0] = M_SPECIAL_INST; 1472 pltent[1] = M_PUSHL_DISP; 1473 pltent += 2; 1474 /* LINTED */ 1475 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1476 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE); 1477 pltent += 4; 1478 pltent[0] = M_SPECIAL_INST; 1479 pltent[1] = M_JMP_DISP_IND; 1480 pltent += 2; 1481 /* LINTED */ 1482 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1483 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE); 1484 } else { 1485 pltent[0] = M_SPECIAL_INST; 1486 pltent[1] = M_PUSHL_REG_DISP; 1487 pltent += 2; 1488 /* LINTED */ 1489 *(Word *)pltent = (Word)(M_GOT_XLINKMAP * 1490 M_GOT_ENTSIZE); 1491 pltent += 4; 1492 pltent[0] = M_SPECIAL_INST; 1493 pltent[1] = M_JMP_REG_DISP_IND; 1494 pltent += 2; 1495 /* LINTED */ 1496 *(Word *)pltent = (Word)(M_GOT_XRTLD * 1497 M_GOT_ENTSIZE); 1498 } 1499 } 1500 return (1); 1501 } 1502