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 2008 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 /* 277 * If we have a replacement value for the relocation 278 * target, put it in place now. 279 */ 280 if (orsp->rel_flags & FLG_REL_NADDEND) { 281 Xword addend = orsp->rel_raddend; 282 uchar_t *addr; 283 284 /* 285 * Get the address of the data item we need to modify. 286 */ 287 addr = (uchar_t *)((uintptr_t)orsp->rel_roffset + 288 (uintptr_t)_elf_getxoff(orsp->rel_isdesc->is_indata)); 289 addr += (uintptr_t)orsp->rel_osdesc->os_outdata->d_buf; 290 if (ld_reloc_targval_set(ofl, orsp, addr, addend) == 0) 291 return (S_ERROR); 292 } 293 294 relbits = (char *)relosp->os_outdata->d_buf; 295 296 rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype); 297 rea.r_offset = roffset; 298 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_REL, &rea, relosp->os_name, 299 orsp->rel_sname)); 300 301 /* 302 * Assert we haven't walked off the end of our relocation table. 303 */ 304 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 305 306 (void) memcpy((relbits + relosp->os_szoutrels), 307 (char *)&rea, sizeof (Rel)); 308 relosp->os_szoutrels += sizeof (Rel); 309 310 /* 311 * Determine if this relocation is against a non-writable, allocatable 312 * section. If so we may need to provide a text relocation diagnostic. 313 * Note that relocations against the .plt (R_386_JMP_SLOT) actually 314 * result in modifications to the .got. 315 */ 316 if (orsp->rel_rtype == R_386_JMP_SLOT) 317 osp = ofl->ofl_osgot; 318 319 ld_reloc_remain_entry(orsp, osp, ofl); 320 return (1); 321 } 322 323 /* 324 * i386 Instructions for TLS processing 325 */ 326 static uchar_t tlsinstr_gd_ie[] = { 327 /* 328 * 0x00 movl %gs:0x0, %eax 329 */ 330 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, 331 /* 332 * 0x06 addl x(%eax), %eax 333 * 0x0c ... 334 */ 335 0x03, 0x80, 0x00, 0x00, 0x00, 0x00 336 }; 337 338 static uchar_t tlsinstr_gd_le[] = { 339 /* 340 * 0x00 movl %gs:0x0, %eax 341 */ 342 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, 343 /* 344 * 0x06 addl $0x0, %eax 345 */ 346 0x05, 0x00, 0x00, 0x00, 0x00, 347 /* 348 * 0x0b nop 349 * 0x0c 350 */ 351 0x90 352 }; 353 354 static uchar_t tlsinstr_gd_ie_movgs[] = { 355 /* 356 * movl %gs:0x0,%eax 357 */ 358 0x65, 0xa1, 0x00, 0x00, 0x00, 00 359 }; 360 361 #define TLS_GD_IE_MOV 0x8b /* movl opcode */ 362 #define TLS_GD_IE_POP 0x58 /* popl + reg */ 363 364 #define TLS_GD_LE_MOVL 0xb8 /* movl + reg */ 365 366 #define TLS_NOP 0x90 /* NOP instruction */ 367 368 #define MODRM_MSK_MOD 0xc0 369 #define MODRM_MSK_RO 0x38 370 #define MODRM_MSK_RM 0x07 371 372 #define SIB_MSK_SS 0xc0 373 #define SIB_MSK_IND 0x38 374 #define SIB_MSK_BS 0x07 375 376 static Fixupret 377 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp) 378 { 379 Sym_desc *sdp = arsp->rel_sym; 380 Word rtype = arsp->rel_rtype; 381 uchar_t *offset, r1, r2; 382 383 offset = (uchar_t *)((uintptr_t)arsp->rel_roffset + 384 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) + 385 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 386 387 if (sdp->sd_ref == REF_DYN_NEED) { 388 /* 389 * IE reference model 390 */ 391 switch (rtype) { 392 case R_386_TLS_GD: 393 /* 394 * Transition: 395 * 0x0 leal x@tlsgd(,r1,1), %eax 396 * 0x7 call ___tls_get_addr 397 * 0xc 398 * To: 399 * 0x0 movl %gs:0, %eax 400 * 0x6 addl x@gotntpoff(r1), %eax 401 */ 402 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 403 R_386_TLS_GOTIE, arsp)); 404 arsp->rel_rtype = R_386_TLS_GOTIE; 405 arsp->rel_roffset += 5; 406 407 /* 408 * Adjust 'offset' to beginning of instruction 409 * sequence. 410 */ 411 offset -= 3; 412 r1 = (offset[2] & SIB_MSK_IND) >> 3; 413 (void) memcpy(offset, tlsinstr_gd_ie, 414 sizeof (tlsinstr_gd_ie)); 415 416 /* 417 * set register %r1 into the addl 418 * instruction. 419 */ 420 offset[0x7] |= r1; 421 return (FIX_RELOC); 422 423 case R_386_TLS_GD_PLT: 424 /* 425 * Fixup done via the TLS_GD relocation 426 */ 427 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 428 R_386_NONE, arsp)); 429 return (FIX_DONE); 430 } 431 } 432 433 /* 434 * LE reference model 435 */ 436 switch (rtype) { 437 case R_386_TLS_GD: 438 /* 439 * Transition: 440 * 0x0 leal x@tlsgd(,r1,1), %eax 441 * 0x7 call ___tls_get_addr 442 * 0xc 443 * To: 444 * 0x0 movl %gs:0, %eax 445 * 0x6 addl $x@ntpoff, %eax 446 * 0xb nop 447 * 0xc 448 */ 449 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 450 R_386_TLS_LE, arsp)); 451 452 arsp->rel_rtype = R_386_TLS_LE; 453 arsp->rel_roffset += 4; 454 455 /* 456 * Adjust 'offset' to beginning of instruction 457 * sequence. 458 */ 459 offset -= 3; 460 (void) memcpy(offset, tlsinstr_gd_le, 461 sizeof (tlsinstr_gd_le)); 462 return (FIX_RELOC); 463 464 case R_386_TLS_GD_PLT: 465 case R_386_PLT32: 466 /* 467 * Fixup done via the TLS_GD relocation 468 */ 469 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 470 R_386_NONE, arsp)); 471 return (FIX_DONE); 472 473 case R_386_TLS_LDM_PLT: 474 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 475 R_386_NONE, arsp)); 476 477 /* 478 * Transition: 479 * call __tls_get_addr() 480 * to: 481 * nop 482 * nop 483 * nop 484 * nop 485 * nop 486 */ 487 *(offset - 1) = TLS_NOP; 488 *(offset) = TLS_NOP; 489 *(offset + 1) = TLS_NOP; 490 *(offset + 2) = TLS_NOP; 491 *(offset + 3) = TLS_NOP; 492 return (FIX_DONE); 493 494 case R_386_TLS_LDM: 495 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 496 R_386_NONE, arsp)); 497 498 /* 499 * Transition: 500 * 501 * 0x00 leal x1@tlsldm(%ebx), %eax 502 * 0x06 call ___tls_get_addr 503 * 504 * to: 505 * 506 * 0x00 movl %gs:0, %eax 507 */ 508 (void) memcpy(offset - 2, tlsinstr_gd_ie_movgs, 509 sizeof (tlsinstr_gd_ie_movgs)); 510 return (FIX_DONE); 511 512 case R_386_TLS_LDO_32: 513 /* 514 * Instructions: 515 * 516 * 0x10 leal x1@dtpoff(%eax), %edx R_386_TLS_LDO_32 517 * to 518 * 0x10 leal x1@ntpoff(%eax), %edx R_386_TLS_LE 519 * 520 */ 521 offset -= 2; 522 523 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 524 R_386_TLS_LE, arsp)); 525 arsp->rel_rtype = R_386_TLS_LE; 526 return (FIX_RELOC); 527 528 case R_386_TLS_GOTIE: 529 /* 530 * These transitions are a little different than the 531 * others, in that we could have multiple instructions 532 * pointed to by a single relocation. Depending upon the 533 * instruction, we perform a different code transition. 534 * 535 * Here's the known transitions: 536 * 537 * 1) movl foo@gotntpoff(%reg1), %reg2 538 * 0x8b, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 539 * 540 * 2) addl foo@gotntpoff(%reg1), %reg2 541 * 0x03, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 542 * 543 * Transitions IE -> LE 544 * 545 * 1) movl $foo@ntpoff, %reg2 546 * 0xc7, 0xc0 | reg2, foo@ntpoff 547 * 548 * 2) addl $foo@ntpoff, %reg2 549 * 0x81, 0xc0 | reg2, foo@ntpoff 550 * 551 * Note: reg1 != 4 (%esp) 552 */ 553 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 554 R_386_TLS_LE, arsp)); 555 arsp->rel_rtype = R_386_TLS_LE; 556 557 offset -= 2; 558 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 559 if (offset[0] == 0x8b) { 560 /* case 1 above */ 561 offset[0] = 0xc7; /* movl */ 562 offset[1] = 0xc0 | r2; 563 return (FIX_RELOC); 564 } 565 566 if (offset[0] == 0x03) { 567 /* case 2 above */ 568 assert(offset[0] == 0x03); 569 offset[0] = 0x81; /* addl */ 570 offset[1] = 0xc0 | r2; 571 return (FIX_RELOC); 572 } 573 574 /* 575 * Unexpected instruction sequence - fatal error. 576 */ 577 { 578 Conv_inv_buf_t inv_buf; 579 580 eprintf(ofl->ofl_lml, ERR_FATAL, 581 MSG_INTL(MSG_REL_BADTLSINS), 582 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 583 arsp->rel_isdesc->is_file->ifl_name, 584 demangle(arsp->rel_sname), 585 arsp->rel_isdesc->is_name, 586 EC_OFF(arsp->rel_roffset)); 587 } 588 return (FIX_ERROR); 589 590 case R_386_TLS_IE: 591 /* 592 * These transitions are a little different than the 593 * others, in that we could have multiple instructions 594 * pointed to by a single relocation. Depending upon the 595 * instruction, we perform a different code transition. 596 * 597 * Here's the known transitions: 598 * 1) movl foo@indntpoff, %eax 599 * 0xa1, foo@indntpoff 600 * 601 * 2) movl foo@indntpoff, %eax 602 * 0x8b, 0x05 | (reg << 3), foo@gotntpoff 603 * 604 * 3) addl foo@indntpoff, %eax 605 * 0x03, 0x05 | (reg << 3), foo@gotntpoff 606 * 607 * Transitions IE -> LE 608 * 609 * 1) movl $foo@ntpoff, %eax 610 * 0xb8, foo@ntpoff 611 * 612 * 2) movl $foo@ntpoff, %reg 613 * 0xc7, 0xc0 | reg, foo@ntpoff 614 * 615 * 3) addl $foo@ntpoff, %reg 616 * 0x81, 0xc0 | reg, foo@ntpoff 617 */ 618 arsp->rel_rtype = R_386_TLS_LE; 619 offset--; 620 if (offset[0] == 0xa1) { 621 /* case 1 above */ 622 offset[0] = 0xb8; /* movl */ 623 return (FIX_RELOC); 624 } 625 626 offset--; 627 if (offset[0] == 0x8b) { 628 /* case 2 above */ 629 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 630 offset[0] = 0xc7; /* movl */ 631 offset[1] = 0xc0 | r2; 632 return (FIX_RELOC); 633 } 634 if (offset[0] == 0x03) { 635 /* case 3 above */ 636 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 637 offset[0] = 0x81; /* addl */ 638 offset[1] = 0xc0 | r2; 639 return (FIX_RELOC); 640 } 641 /* 642 * Unexpected instruction sequence - fatal error. 643 */ 644 { 645 Conv_inv_buf_t inv_buf; 646 647 eprintf(ofl->ofl_lml, ERR_FATAL, 648 MSG_INTL(MSG_REL_BADTLSINS), 649 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 650 arsp->rel_isdesc->is_file->ifl_name, 651 demangle(arsp->rel_sname), 652 arsp->rel_isdesc->is_name, 653 EC_OFF(arsp->rel_roffset)); 654 } 655 return (FIX_ERROR); 656 } 657 return (FIX_RELOC); 658 } 659 660 uintptr_t 661 ld_do_activerelocs(Ofl_desc *ofl) 662 { 663 Rel_desc *arsp; 664 Rel_cache *rcp; 665 Listnode *lnp; 666 uintptr_t return_code = 1; 667 Word flags = ofl->ofl_flags; 668 669 if (ofl->ofl_actrels.head) 670 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 671 672 /* 673 * Process active relocations. 674 */ 675 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 676 /* LINTED */ 677 for (arsp = (Rel_desc *)(rcp + 1); 678 arsp < rcp->rc_free; arsp++) { 679 uchar_t *addr; 680 Xword value; 681 Sym_desc *sdp; 682 const char *ifl_name; 683 Xword refaddr; 684 int moved = 0; 685 Gotref gref; 686 687 /* 688 * If the section this relocation is against has been 689 * discarded (-zignore), then discard (skip) the 690 * relocation itself. 691 */ 692 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 693 ((arsp->rel_flags & 694 (FLG_REL_GOT | FLG_REL_BSS | 695 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 696 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 697 M_MACH, arsp)); 698 continue; 699 } 700 701 /* 702 * We deteremine what the 'got reference' 703 * model (if required) is at this point. This 704 * needs to be done before tls_fixup() since 705 * it may 'transition' our instructions. 706 * 707 * The got table entries have already been assigned, 708 * and we bind to those initial entries. 709 */ 710 if (arsp->rel_flags & FLG_REL_DTLS) 711 gref = GOT_REF_TLSGD; 712 else if (arsp->rel_flags & FLG_REL_MTLS) 713 gref = GOT_REF_TLSLD; 714 else if (arsp->rel_flags & FLG_REL_STLS) 715 gref = GOT_REF_TLSIE; 716 else 717 gref = GOT_REF_GENERIC; 718 719 /* 720 * Perform any required TLS fixups. 721 */ 722 if (arsp->rel_flags & FLG_REL_TLSFIX) { 723 Fixupret ret; 724 725 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 726 return (S_ERROR); 727 if (ret == FIX_DONE) 728 continue; 729 } 730 731 /* 732 * If this is a relocation against a move table, or 733 * expanded move table, adjust the relocation entries. 734 */ 735 if (arsp->rel_move) 736 ld_adj_movereloc(ofl, arsp); 737 738 sdp = arsp->rel_sym; 739 refaddr = arsp->rel_roffset + 740 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 741 742 if (arsp->rel_flags & FLG_REL_CLVAL) 743 value = 0; 744 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 745 STT_SECTION) { 746 Sym_desc *sym; 747 748 /* 749 * The value for a symbol pointing to a SECTION 750 * is based off of that sections position. 751 * 752 * The second argument of the ld_am_I_partial() 753 * is the value stored at the target address 754 * relocation is going to be applied. 755 */ 756 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 757 /* LINTED */ 758 (sym = ld_am_I_partial(arsp, *(Xword *) 759 ((uchar_t *) 760 arsp->rel_isdesc->is_indata->d_buf + 761 arsp->rel_roffset)))) { 762 /* 763 * If the symbol is moved, 764 * adjust the value 765 */ 766 value = sym->sd_sym->st_value; 767 moved = 1; 768 } else { 769 value = _elf_getxoff( 770 sdp->sd_isc->is_indata); 771 if (sdp->sd_isc->is_shdr->sh_flags & 772 SHF_ALLOC) 773 value += sdp->sd_isc-> 774 is_osdesc->os_shdr->sh_addr; 775 } 776 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 777 value -= ofl->ofl_tlsphdr->p_vaddr; 778 779 } else if (IS_SIZE(arsp->rel_rtype)) { 780 /* 781 * Size relocations require the symbols size. 782 */ 783 value = sdp->sd_sym->st_size; 784 } else { 785 /* 786 * Else the value is the symbols value. 787 */ 788 value = sdp->sd_sym->st_value; 789 } 790 791 /* 792 * Relocation against the GLOBAL_OFFSET_TABLE. 793 */ 794 if (arsp->rel_flags & FLG_REL_GOT) 795 arsp->rel_osdesc = ofl->ofl_osgot; 796 797 /* 798 * If loadable and not producing a relocatable object 799 * add the sections virtual address to the reference 800 * address. 801 */ 802 if ((arsp->rel_flags & FLG_REL_LOAD) && 803 ((flags & FLG_OF_RELOBJ) == 0)) 804 refaddr += arsp->rel_isdesc->is_osdesc-> 805 os_shdr->sh_addr; 806 807 /* 808 * If this entry has a PLT assigned to it, it's 809 * value is actually the address of the PLT (and 810 * not the address of the function). 811 */ 812 if (IS_PLT(arsp->rel_rtype)) { 813 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 814 value = ld_calc_plt_addr(sdp, ofl); 815 } 816 817 /* 818 * Determine whether the value needs further adjustment. 819 * Filter through the attributes of the relocation to 820 * determine what adjustment is required. Note, many 821 * of the following cases are only applicable when a 822 * .got is present. As a .got is not generated when a 823 * relocatable object is being built, any adjustments 824 * that require a .got need to be skipped. 825 */ 826 if ((arsp->rel_flags & FLG_REL_GOT) && 827 ((flags & FLG_OF_RELOBJ) == 0)) { 828 Xword R1addr; 829 uintptr_t R2addr; 830 Word gotndx; 831 Gotndx *gnp; 832 833 /* 834 * Perform relocation against GOT table. Since 835 * this doesn't fit exactly into a relocation 836 * we place the appropriate byte in the GOT 837 * directly 838 * 839 * Calculate offset into GOT at which to apply 840 * the relocation. 841 */ 842 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 843 ofl, 0); 844 assert(gnp); 845 846 if (arsp->rel_rtype == R_386_TLS_DTPOFF32) 847 gotndx = gnp->gn_gotndx + 1; 848 else 849 gotndx = gnp->gn_gotndx; 850 851 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE); 852 853 /* 854 * Add the GOTs data's offset. 855 */ 856 R2addr = R1addr + (uintptr_t) 857 arsp->rel_osdesc->os_outdata->d_buf; 858 859 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 860 ELF_DBG_LD, M_MACH, SHT_REL, 861 arsp->rel_rtype, R1addr, value, 862 arsp->rel_sname, arsp->rel_osdesc)); 863 864 /* 865 * And do it. 866 */ 867 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 868 *(Xword *)R2addr = 869 ld_byteswap_Xword(value); 870 else 871 *(Xword *)R2addr = value; 872 continue; 873 874 } else if (IS_GOT_BASED(arsp->rel_rtype) && 875 ((flags & FLG_OF_RELOBJ) == 0)) { 876 value -= ofl->ofl_osgot->os_shdr->sh_addr; 877 878 } else if (IS_GOT_PC(arsp->rel_rtype) && 879 ((flags & FLG_OF_RELOBJ) == 0)) { 880 value = 881 (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) - 882 refaddr; 883 884 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) && 885 (((flags & FLG_OF_RELOBJ) == 0) || 886 (arsp->rel_osdesc == sdp->sd_isc->is_osdesc))) { 887 value -= refaddr; 888 889 } else if (IS_TLS_INS(arsp->rel_rtype) && 890 IS_GOT_RELATIVE(arsp->rel_rtype) && 891 ((flags & FLG_OF_RELOBJ) == 0)) { 892 Gotndx *gnp; 893 894 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 895 ofl, 0); 896 assert(gnp); 897 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 898 if (arsp->rel_rtype == R_386_TLS_IE) { 899 value += 900 ofl->ofl_osgot->os_shdr->sh_addr; 901 } 902 903 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 904 ((flags & FLG_OF_RELOBJ) == 0)) { 905 Gotndx *gnp; 906 907 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 908 GOT_REF_GENERIC, ofl, 0); 909 assert(gnp); 910 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 911 912 } else if ((arsp->rel_flags & FLG_REL_STLS) && 913 ((flags & FLG_OF_RELOBJ) == 0)) { 914 Xword tlsstatsize; 915 916 /* 917 * This is the LE TLS reference model. Static 918 * offset is hard-coded. 919 */ 920 tlsstatsize = 921 S_ROUND(ofl->ofl_tlsphdr->p_memsz, 922 M_TLSSTATALIGN); 923 value = tlsstatsize - value; 924 925 /* 926 * Since this code is fixed up, it assumes a 927 * negative offset that can be added to the 928 * thread pointer. 929 */ 930 if ((arsp->rel_rtype == R_386_TLS_LDO_32) || 931 (arsp->rel_rtype == R_386_TLS_LE)) 932 value = -value; 933 } 934 935 if (arsp->rel_isdesc->is_file) 936 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 937 else 938 ifl_name = MSG_INTL(MSG_STR_NULL); 939 940 /* 941 * Make sure we have data to relocate. Compiler and 942 * assembler developers have been known to generate 943 * relocations against invalid sections (normally .bss), 944 * so for their benefit give them sufficient information 945 * to help analyze the problem. End users should never 946 * see this. 947 */ 948 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 949 Conv_inv_buf_t inv_buf; 950 951 eprintf(ofl->ofl_lml, ERR_FATAL, 952 MSG_INTL(MSG_REL_EMPTYSEC), 953 conv_reloc_386_type(arsp->rel_rtype, 954 0, &inv_buf), 955 ifl_name, demangle(arsp->rel_sname), 956 arsp->rel_isdesc->is_name); 957 return (S_ERROR); 958 } 959 960 /* 961 * Get the address of the data item we need to modify. 962 */ 963 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 964 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 965 is_indata)); 966 967 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 968 M_MACH, SHT_REL, arsp->rel_rtype, EC_NATPTR(addr), 969 value, arsp->rel_sname, arsp->rel_osdesc)); 970 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 971 972 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 973 ofl->ofl_size) || (arsp->rel_roffset > 974 arsp->rel_osdesc->os_shdr->sh_size)) { 975 Conv_inv_buf_t inv_buf; 976 int class; 977 978 if (((uintptr_t)addr - 979 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 980 class = ERR_FATAL; 981 else 982 class = ERR_WARNING; 983 984 eprintf(ofl->ofl_lml, class, 985 MSG_INTL(MSG_REL_INVALOFFSET), 986 conv_reloc_386_type(arsp->rel_rtype, 987 0, &inv_buf), 988 ifl_name, arsp->rel_isdesc->is_name, 989 demangle(arsp->rel_sname), 990 EC_ADDR((uintptr_t)addr - 991 (uintptr_t)ofl->ofl_nehdr)); 992 993 if (class == ERR_FATAL) { 994 return_code = S_ERROR; 995 continue; 996 } 997 } 998 999 /* 1000 * The relocation is additive. Ignore the previous 1001 * symbol value if this local partial symbol is 1002 * expanded. 1003 */ 1004 if (moved) 1005 value -= *addr; 1006 1007 /* 1008 * If we have a replacement value for the relocation 1009 * target, put it in place now. 1010 */ 1011 if (arsp->rel_flags & FLG_REL_NADDEND) { 1012 Xword addend = arsp->rel_raddend; 1013 1014 if (ld_reloc_targval_set(ofl, arsp, 1015 addr, addend) == 0) 1016 return (S_ERROR); 1017 } 1018 1019 /* 1020 * If '-z noreloc' is specified - skip the do_reloc_ld 1021 * stage. 1022 */ 1023 if (OFL_DO_RELOC(ofl)) { 1024 if (do_reloc_ld((uchar_t)arsp->rel_rtype, addr, 1025 &value, arsp->rel_sname, ifl_name, 1026 OFL_SWAP_RELOC_DATA(ofl, arsp), 1027 ofl->ofl_lml) == 0) 1028 return_code = S_ERROR; 1029 } 1030 } 1031 } 1032 return (return_code); 1033 } 1034 1035 /* 1036 * Add an output relocation record. 1037 */ 1038 uintptr_t 1039 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1040 { 1041 Rel_desc *orsp; 1042 Rel_cache *rcp; 1043 Sym_desc *sdp = rsp->rel_sym; 1044 1045 /* 1046 * Static executables *do not* want any relocations against them. 1047 * Since our engine still creates relocations against a WEAK UNDEFINED 1048 * symbol in a static executable, it's best to disable them here 1049 * instead of through out the relocation code. 1050 */ 1051 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 1052 (FLG_OF_STATIC | FLG_OF_EXEC)) 1053 return (1); 1054 1055 /* 1056 * If no relocation cache structures are available allocate 1057 * a new one and link it into the cache list. 1058 */ 1059 if ((ofl->ofl_outrels.tail == 0) || 1060 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1061 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1062 static size_t nextsize = 0; 1063 size_t size; 1064 1065 /* 1066 * Output relocation numbers can vary considerably between 1067 * building executables or shared objects (pic vs. non-pic), 1068 * etc. But, they typically aren't very large, so for these 1069 * objects use a standard bucket size. For building relocatable 1070 * objects, typically there will be an output relocation for 1071 * every input relocation. 1072 */ 1073 if (nextsize == 0) { 1074 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1075 if ((size = ofl->ofl_relocincnt) == 0) 1076 size = REL_LOIDESCNO; 1077 if (size > REL_HOIDESCNO) 1078 nextsize = REL_HOIDESCNO; 1079 else 1080 nextsize = REL_LOIDESCNO; 1081 } else 1082 nextsize = size = REL_HOIDESCNO; 1083 } else 1084 size = nextsize; 1085 1086 size = size * sizeof (Rel_desc); 1087 1088 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1089 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1090 return (S_ERROR); 1091 1092 /* LINTED */ 1093 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1094 /* LINTED */ 1095 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1096 } 1097 1098 /* 1099 * If we are adding a output relocation against a section 1100 * symbol (non-RELATIVE) then mark that section. These sections 1101 * will be added to the .dynsym symbol table. 1102 */ 1103 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1104 ((flags & FLG_REL_SCNNDX) || 1105 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1106 1107 /* 1108 * If this is a COMMON symbol - no output section 1109 * exists yet - (it's created as part of sym_validate()). 1110 * So - we mark here that when it's created it should 1111 * be tagged with the FLG_OS_OUTREL flag. 1112 */ 1113 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1114 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1115 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1116 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1117 else 1118 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1119 } else { 1120 Os_desc *osp = sdp->sd_isc->is_osdesc; 1121 1122 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1123 ofl->ofl_dynshdrcnt++; 1124 osp->os_flags |= FLG_OS_OUTREL; 1125 } 1126 } 1127 } 1128 1129 *orsp = *rsp; 1130 orsp->rel_flags |= flags; 1131 1132 rcp->rc_free++; 1133 ofl->ofl_outrelscnt++; 1134 1135 if (flags & FLG_REL_GOT) 1136 ofl->ofl_relocgotsz += (Xword)sizeof (Rel); 1137 else if (flags & FLG_REL_PLT) 1138 ofl->ofl_relocpltsz += (Xword)sizeof (Rel); 1139 else if (flags & FLG_REL_BSS) 1140 ofl->ofl_relocbsssz += (Xword)sizeof (Rel); 1141 else if (flags & FLG_REL_NOINFO) 1142 ofl->ofl_relocrelsz += (Xword)sizeof (Rel); 1143 else 1144 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rel); 1145 1146 if (orsp->rel_rtype == M_R_RELATIVE) 1147 ofl->ofl_relocrelcnt++; 1148 1149 /* 1150 * We don't perform sorting on PLT relocations because 1151 * they have already been assigned a PLT index and if we 1152 * were to sort them we would have to re-assign the plt indexes. 1153 */ 1154 if (!(flags & FLG_REL_PLT)) 1155 ofl->ofl_reloccnt++; 1156 1157 /* 1158 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1159 */ 1160 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1161 ofl->ofl_flags |= FLG_OF_BLDGOT; 1162 1163 /* 1164 * Identify and possibly warn of a displacement relocation. 1165 */ 1166 if (orsp->rel_flags & FLG_REL_DISP) { 1167 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1168 1169 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1170 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1171 } 1172 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL, 1173 M_MACH, orsp)); 1174 return (1); 1175 } 1176 1177 /* 1178 * Stub routine since register symbols are not supported on i386. 1179 */ 1180 /* ARGSUSED */ 1181 uintptr_t 1182 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1183 { 1184 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_NOREG)); 1185 return (S_ERROR); 1186 } 1187 1188 /* 1189 * process relocation for a LOCAL symbol 1190 */ 1191 uintptr_t 1192 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1193 { 1194 Word flags = ofl->ofl_flags; 1195 Sym_desc *sdp = rsp->rel_sym; 1196 Word shndx = sdp->sd_sym->st_shndx; 1197 1198 /* 1199 * if ((shared object) and (not pc relative relocation) and 1200 * (not against ABS symbol)) 1201 * then 1202 * build R_386_RELATIVE 1203 * fi 1204 */ 1205 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1206 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1207 !(IS_GOT_BASED(rsp->rel_rtype)) && 1208 !(rsp->rel_isdesc != NULL && 1209 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1210 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1211 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1212 Word ortype = rsp->rel_rtype; 1213 1214 rsp->rel_rtype = R_386_RELATIVE; 1215 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR) 1216 return (S_ERROR); 1217 rsp->rel_rtype = ortype; 1218 } 1219 1220 /* 1221 * If the relocation is against a 'non-allocatable' section 1222 * and we can not resolve it now - then give a warning 1223 * message. 1224 * 1225 * We can not resolve the symbol if either: 1226 * a) it's undefined 1227 * b) it's defined in a shared library and a 1228 * COPY relocation hasn't moved it to the executable 1229 * 1230 * Note: because we process all of the relocations against the 1231 * text segment before any others - we know whether 1232 * or not a copy relocation will be generated before 1233 * we get here (see reloc_init()->reloc_segments()). 1234 */ 1235 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1236 ((shndx == SHN_UNDEF) || 1237 ((sdp->sd_ref == REF_DYN_NEED) && 1238 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1239 Conv_inv_buf_t inv_buf; 1240 1241 /* 1242 * If the relocation is against a SHT_SUNW_ANNOTATE 1243 * section - then silently ignore that the relocation 1244 * can not be resolved. 1245 */ 1246 if (rsp->rel_osdesc && 1247 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1248 return (0); 1249 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), 1250 conv_reloc_386_type(rsp->rel_rtype, 0, &inv_buf), 1251 rsp->rel_isdesc->is_file->ifl_name, 1252 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1253 return (1); 1254 } 1255 1256 /* 1257 * Perform relocation. 1258 */ 1259 return (ld_add_actrel(NULL, rsp, ofl)); 1260 } 1261 1262 uintptr_t 1263 /* ARGSUSED */ 1264 ld_reloc_GOTOP(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1265 { 1266 /* 1267 * Stub routine for common code compatibility, we shouldn't 1268 * actually get here on x86. 1269 */ 1270 assert(0); 1271 return (S_ERROR); 1272 } 1273 1274 uintptr_t 1275 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1276 { 1277 Word rtype = rsp->rel_rtype; 1278 Sym_desc *sdp = rsp->rel_sym; 1279 Word flags = ofl->ofl_flags; 1280 Gotndx *gnp; 1281 1282 /* 1283 * If we're building an executable - use either the IE or LE access 1284 * model. If we're building a shared object process any IE model. 1285 */ 1286 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1287 /* 1288 * Set the DF_STATIC_TLS flag. 1289 */ 1290 ofl->ofl_dtflags |= DF_STATIC_TLS; 1291 1292 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1293 /* 1294 * Assign a GOT entry for static TLS references. 1295 */ 1296 if ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1297 GOT_REF_TLSIE, ofl, 0)) == 0) { 1298 1299 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1300 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1301 rtype, R_386_TLS_TPOFF, 0) == S_ERROR) 1302 return (S_ERROR); 1303 } 1304 1305 /* 1306 * IE access model. 1307 */ 1308 if (IS_TLS_IE(rtype)) { 1309 if (ld_add_actrel(FLG_REL_STLS, 1310 rsp, ofl) == S_ERROR) 1311 return (S_ERROR); 1312 1313 /* 1314 * A non-pic shared object needs to adjust the 1315 * active relocation (indntpoff). 1316 */ 1317 if (((flags & FLG_OF_EXEC) == 0) && 1318 (rtype == R_386_TLS_IE)) { 1319 rsp->rel_rtype = R_386_RELATIVE; 1320 return (ld_add_outrel(NULL, rsp, ofl)); 1321 } 1322 return (1); 1323 } 1324 1325 /* 1326 * Fixups are required for other executable models. 1327 */ 1328 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1329 rsp, ofl)); 1330 } 1331 1332 /* 1333 * LE access model. 1334 */ 1335 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32)) 1336 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1337 1338 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1339 rsp, ofl)); 1340 } 1341 1342 /* 1343 * Building a shared object. 1344 * 1345 * Assign a GOT entry for a dynamic TLS reference. 1346 */ 1347 if (IS_TLS_LD(rtype) && ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1348 GOT_REF_TLSLD, ofl, 0)) == 0)) { 1349 1350 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1351 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, 0) == S_ERROR) 1352 return (S_ERROR); 1353 1354 } else if (IS_TLS_GD(rtype) && 1355 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1356 ofl, 0)) == 0)) { 1357 1358 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1359 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32, 1360 R_386_TLS_DTPOFF32) == S_ERROR) 1361 return (S_ERROR); 1362 } 1363 1364 /* 1365 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1366 * cause a call to __tls_get_addr(). Convert this relocation to that 1367 * symbol now, and prepare for the PLT magic. 1368 */ 1369 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) { 1370 Sym_desc *tlsgetsym; 1371 1372 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU), 1373 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1374 return (S_ERROR); 1375 1376 rsp->rel_sym = tlsgetsym; 1377 rsp->rel_sname = tlsgetsym->sd_name; 1378 rsp->rel_rtype = R_386_PLT32; 1379 1380 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1381 return (S_ERROR); 1382 1383 rsp->rel_sym = sdp; 1384 rsp->rel_sname = sdp->sd_name; 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 /* ARGSUSED3 */ 1396 Gotndx * 1397 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1398 { 1399 Listnode * lnp; 1400 Gotndx * gnp; 1401 1402 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1403 return (ofl->ofl_tlsldgotndx); 1404 1405 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1406 if (gnp->gn_gotref == gref) 1407 return (gnp); 1408 } 1409 return ((Gotndx *)0); 1410 } 1411 1412 Xword 1413 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1414 { 1415 Os_desc *osp = ofl->ofl_osgot; 1416 Sym_desc *sdp = rdesc->rel_sym; 1417 Xword gotndx; 1418 Gotref gref; 1419 Gotndx *gnp; 1420 1421 if (rdesc->rel_flags & FLG_REL_DTLS) 1422 gref = GOT_REF_TLSGD; 1423 else if (rdesc->rel_flags & FLG_REL_MTLS) 1424 gref = GOT_REF_TLSLD; 1425 else if (rdesc->rel_flags & FLG_REL_STLS) 1426 gref = GOT_REF_TLSIE; 1427 else 1428 gref = GOT_REF_GENERIC; 1429 1430 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, 0); 1431 assert(gnp); 1432 1433 gotndx = (Xword)gnp->gn_gotndx; 1434 1435 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1436 (rdesc->rel_rtype == R_386_TLS_DTPOFF32)) 1437 gotndx++; 1438 1439 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE))); 1440 } 1441 1442 1443 /* ARGSUSED4 */ 1444 uintptr_t 1445 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1446 Rel_desc * rsp, Sym_desc * sdp) 1447 { 1448 Gotndx *gnp; 1449 uint_t gotents; 1450 1451 if (pgnp) 1452 return (1); 1453 1454 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1455 gotents = 2; 1456 else 1457 gotents = 1; 1458 1459 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 1460 return (S_ERROR); 1461 gnp->gn_gotndx = ofl->ofl_gotcnt; 1462 gnp->gn_gotref = gref; 1463 1464 ofl->ofl_gotcnt += gotents; 1465 1466 if (gref == GOT_REF_TLSLD) { 1467 ofl->ofl_tlsldgotndx = gnp; 1468 return (1); 1469 } 1470 1471 if (list_appendc(lst, (void *)gnp) == 0) 1472 return (S_ERROR); 1473 1474 return (1); 1475 } 1476 1477 void 1478 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 1479 { 1480 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 1481 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++; 1482 ofl->ofl_flags |= FLG_OF_BLDGOT; 1483 } 1484 1485 /* 1486 * Initializes .got[0] with the _DYNAMIC symbol value. 1487 */ 1488 uintptr_t 1489 ld_fillin_gotplt(Ofl_desc *ofl) 1490 { 1491 Word flags = ofl->ofl_flags; 1492 1493 if (ofl->ofl_osgot) { 1494 Sym_desc *sdp; 1495 1496 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 1497 SYM_NOHASH, 0, ofl)) != NULL) { 1498 uchar_t *genptr; 1499 1500 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 1501 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 1502 /* LINTED */ 1503 *(Word *)genptr = (Word)sdp->sd_sym->st_value; 1504 } 1505 } 1506 1507 /* 1508 * Fill in the reserved slot in the procedure linkage table the first 1509 * entry is: 1510 * if (building a.out) { 1511 * PUSHL got[1] # the address of the link map entry 1512 * JMP * got[2] # the address of rtbinder 1513 * } else { 1514 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry 1515 * JMP * got[2]@GOT(%ebx) # the address of rtbinder 1516 * } 1517 */ 1518 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { 1519 uchar_t *pltent; 1520 1521 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 1522 if (!(flags & FLG_OF_SHAROBJ)) { 1523 pltent[0] = M_SPECIAL_INST; 1524 pltent[1] = M_PUSHL_DISP; 1525 pltent += 2; 1526 /* LINTED */ 1527 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1528 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE); 1529 pltent += 4; 1530 pltent[0] = M_SPECIAL_INST; 1531 pltent[1] = M_JMP_DISP_IND; 1532 pltent += 2; 1533 /* LINTED */ 1534 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1535 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE); 1536 } else { 1537 pltent[0] = M_SPECIAL_INST; 1538 pltent[1] = M_PUSHL_REG_DISP; 1539 pltent += 2; 1540 /* LINTED */ 1541 *(Word *)pltent = (Word)(M_GOT_XLINKMAP * 1542 M_GOT_ENTSIZE); 1543 pltent += 4; 1544 pltent[0] = M_SPECIAL_INST; 1545 pltent[1] = M_JMP_REG_DISP_IND; 1546 pltent += 2; 1547 /* LINTED */ 1548 *(Word *)pltent = (Word)(M_GOT_XRTLD * 1549 M_GOT_ENTSIZE); 1550 } 1551 } 1552 return (1); 1553 } 1554