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 { 560 Conv_inv_buf_t inv_buf; 561 562 eprintf(ofl->ofl_lml, ERR_FATAL, 563 MSG_INTL(MSG_REL_BADTLSINS), 564 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 565 arsp->rel_isdesc->is_file->ifl_name, 566 demangle(arsp->rel_sname), 567 arsp->rel_isdesc->is_name, 568 EC_OFF(arsp->rel_roffset)); 569 } 570 return (FIX_ERROR); 571 572 case R_386_TLS_IE: 573 /* 574 * These transitions are a little different than the 575 * others, in that we could have multiple instructions 576 * pointed to by a single relocation. Depending upon the 577 * instruction, we perform a different code transition. 578 * 579 * Here's the known transitions: 580 * 1) movl foo@indntpoff, %eax 581 * 0xa1, foo@indntpoff 582 * 583 * 2) movl foo@indntpoff, %eax 584 * 0x8b, 0x05 | (reg << 3), foo@gotntpoff 585 * 586 * 3) addl foo@indntpoff, %eax 587 * 0x03, 0x05 | (reg << 3), foo@gotntpoff 588 * 589 * Transitions IE -> LE 590 * 591 * 1) movl $foo@ntpoff, %eax 592 * 0xb8, foo@ntpoff 593 * 594 * 2) movl $foo@ntpoff, %reg 595 * 0xc7, 0xc0 | reg, foo@ntpoff 596 * 597 * 3) addl $foo@ntpoff, %reg 598 * 0x81, 0xc0 | reg, foo@ntpoff 599 */ 600 arsp->rel_rtype = R_386_TLS_LE; 601 offset--; 602 if (offset[0] == 0xa1) { 603 /* case 1 above */ 604 offset[0] = 0xb8; /* movl */ 605 return (FIX_RELOC); 606 } 607 608 offset--; 609 if (offset[0] == 0x8b) { 610 /* case 2 above */ 611 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 612 offset[0] = 0xc7; /* movl */ 613 offset[1] = 0xc0 | r2; 614 return (FIX_RELOC); 615 } 616 if (offset[0] == 0x03) { 617 /* case 3 above */ 618 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 619 offset[0] = 0x81; /* addl */ 620 offset[1] = 0xc0 | r2; 621 return (FIX_RELOC); 622 } 623 /* 624 * Unexpected instruction sequence - fatal error. 625 */ 626 { 627 Conv_inv_buf_t inv_buf; 628 629 eprintf(ofl->ofl_lml, ERR_FATAL, 630 MSG_INTL(MSG_REL_BADTLSINS), 631 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf), 632 arsp->rel_isdesc->is_file->ifl_name, 633 demangle(arsp->rel_sname), 634 arsp->rel_isdesc->is_name, 635 EC_OFF(arsp->rel_roffset)); 636 } 637 return (FIX_ERROR); 638 } 639 return (FIX_RELOC); 640 } 641 642 uintptr_t 643 ld_do_activerelocs(Ofl_desc *ofl) 644 { 645 Rel_desc *arsp; 646 Rel_cache *rcp; 647 Listnode *lnp; 648 uintptr_t return_code = 1; 649 Word flags = ofl->ofl_flags; 650 Word dtflags1 = ofl->ofl_dtflags_1; 651 652 if (ofl->ofl_actrels.head) 653 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 654 655 /* 656 * Process active relocations. 657 */ 658 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 659 /* LINTED */ 660 for (arsp = (Rel_desc *)(rcp + 1); 661 arsp < rcp->rc_free; arsp++) { 662 uchar_t *addr; 663 Xword value; 664 Sym_desc *sdp; 665 const char *ifl_name; 666 Xword refaddr; 667 int moved = 0; 668 Gotref gref; 669 670 /* 671 * If the section this relocation is against has been 672 * discarded (-zignore), then discard (skip) the 673 * relocation itself. 674 */ 675 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 676 ((arsp->rel_flags & 677 (FLG_REL_GOT | FLG_REL_BSS | 678 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 679 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 680 M_MACH, arsp)); 681 continue; 682 } 683 684 /* 685 * We deteremine what the 'got reference' 686 * model (if required) is at this point. This 687 * needs to be done before tls_fixup() since 688 * it may 'transition' our instructions. 689 * 690 * The got table entries have already been assigned, 691 * and we bind to those initial entries. 692 */ 693 if (arsp->rel_flags & FLG_REL_DTLS) 694 gref = GOT_REF_TLSGD; 695 else if (arsp->rel_flags & FLG_REL_MTLS) 696 gref = GOT_REF_TLSLD; 697 else if (arsp->rel_flags & FLG_REL_STLS) 698 gref = GOT_REF_TLSIE; 699 else 700 gref = GOT_REF_GENERIC; 701 702 /* 703 * Perform any required TLS fixups. 704 */ 705 if (arsp->rel_flags & FLG_REL_TLSFIX) { 706 Fixupret ret; 707 708 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 709 return (S_ERROR); 710 if (ret == FIX_DONE) 711 continue; 712 } 713 714 /* 715 * If this is a relocation against a move table, or 716 * expanded move table, adjust the relocation entries. 717 */ 718 if (arsp->rel_move) 719 ld_adj_movereloc(ofl, arsp); 720 721 sdp = arsp->rel_sym; 722 refaddr = arsp->rel_roffset + 723 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 724 725 if (arsp->rel_flags & FLG_REL_CLVAL) 726 value = 0; 727 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 728 STT_SECTION) { 729 Sym_desc *sym; 730 731 /* 732 * The value for a symbol pointing to a SECTION 733 * is based off of that sections position. 734 * 735 * The second argument of the ld_am_I_partial() 736 * is the value stored at the target address 737 * relocation is going to be applied. 738 */ 739 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 740 /* LINTED */ 741 (sym = ld_am_I_partial(arsp, *(Xword *) 742 ((uchar_t *) 743 arsp->rel_isdesc->is_indata->d_buf + 744 arsp->rel_roffset)))) { 745 /* 746 * If the symbol is moved, 747 * adjust the value 748 */ 749 value = sym->sd_sym->st_value; 750 moved = 1; 751 } else { 752 value = _elf_getxoff( 753 sdp->sd_isc->is_indata); 754 if (sdp->sd_isc->is_shdr->sh_flags & 755 SHF_ALLOC) 756 value += sdp->sd_isc-> 757 is_osdesc->os_shdr->sh_addr; 758 } 759 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 760 value -= ofl->ofl_tlsphdr->p_vaddr; 761 762 } else if (IS_SIZE(arsp->rel_rtype)) { 763 /* 764 * Size relocations require the symbols size. 765 */ 766 value = sdp->sd_sym->st_size; 767 } else { 768 /* 769 * Else the value is the symbols value. 770 */ 771 value = sdp->sd_sym->st_value; 772 } 773 774 /* 775 * Relocation against the GLOBAL_OFFSET_TABLE. 776 */ 777 if (arsp->rel_flags & FLG_REL_GOT) 778 arsp->rel_osdesc = ofl->ofl_osgot; 779 780 /* 781 * If loadable and not producing a relocatable object 782 * add the sections virtual address to the reference 783 * address. 784 */ 785 if ((arsp->rel_flags & FLG_REL_LOAD) && 786 ((flags & FLG_OF_RELOBJ) == 0)) 787 refaddr += arsp->rel_isdesc->is_osdesc-> 788 os_shdr->sh_addr; 789 790 /* 791 * If this entry has a PLT assigned to it, it's 792 * value is actually the address of the PLT (and 793 * not the address of the function). 794 */ 795 if (IS_PLT(arsp->rel_rtype)) { 796 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 797 value = ld_calc_plt_addr(sdp, ofl); 798 } 799 800 /* 801 * Determine whether the value needs further adjustment. 802 * Filter through the attributes of the relocation to 803 * determine what adjustment is required. Note, many 804 * of the following cases are only applicable when a 805 * .got is present. As a .got is not generated when a 806 * relocatable object is being built, any adjustments 807 * that require a .got need to be skipped. 808 */ 809 if ((arsp->rel_flags & FLG_REL_GOT) && 810 ((flags & FLG_OF_RELOBJ) == 0)) { 811 Xword R1addr; 812 uintptr_t R2addr; 813 Word gotndx; 814 Gotndx *gnp; 815 816 /* 817 * Perform relocation against GOT table. Since 818 * this doesn't fit exactly into a relocation 819 * we place the appropriate byte in the GOT 820 * directly 821 * 822 * Calculate offset into GOT at which to apply 823 * the relocation. 824 */ 825 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 826 ofl, 0); 827 assert(gnp); 828 829 if (arsp->rel_rtype == R_386_TLS_DTPOFF32) 830 gotndx = gnp->gn_gotndx + 1; 831 else 832 gotndx = gnp->gn_gotndx; 833 834 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE); 835 836 /* 837 * Add the GOTs data's offset. 838 */ 839 R2addr = R1addr + (uintptr_t) 840 arsp->rel_osdesc->os_outdata->d_buf; 841 842 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 843 ELF_DBG_LD, M_MACH, SHT_REL, 844 arsp->rel_rtype, R1addr, value, 845 arsp->rel_sname, arsp->rel_osdesc)); 846 847 /* 848 * And do it. 849 */ 850 *(Xword *)R2addr = value; 851 continue; 852 853 } else if (IS_GOT_BASED(arsp->rel_rtype) && 854 ((flags & FLG_OF_RELOBJ) == 0)) { 855 value -= ofl->ofl_osgot->os_shdr->sh_addr; 856 857 } else if (IS_GOT_PC(arsp->rel_rtype) && 858 ((flags & FLG_OF_RELOBJ) == 0)) { 859 value = 860 (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) - 861 refaddr; 862 863 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) && 864 (((flags & FLG_OF_RELOBJ) == 0) || 865 (arsp->rel_osdesc == sdp->sd_isc->is_osdesc))) { 866 value -= refaddr; 867 868 } else if (IS_TLS_INS(arsp->rel_rtype) && 869 IS_GOT_RELATIVE(arsp->rel_rtype) && 870 ((flags & FLG_OF_RELOBJ) == 0)) { 871 Gotndx *gnp; 872 873 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 874 ofl, 0); 875 assert(gnp); 876 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 877 if (arsp->rel_rtype == R_386_TLS_IE) { 878 value += 879 ofl->ofl_osgot->os_shdr->sh_addr; 880 } 881 882 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 883 ((flags & FLG_OF_RELOBJ) == 0)) { 884 Gotndx *gnp; 885 886 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 887 GOT_REF_GENERIC, ofl, 0); 888 assert(gnp); 889 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 890 891 } else if ((arsp->rel_flags & FLG_REL_STLS) && 892 ((flags & FLG_OF_RELOBJ) == 0)) { 893 Xword tlsstatsize; 894 895 /* 896 * This is the LE TLS reference model. Static 897 * offset is hard-coded. 898 */ 899 tlsstatsize = 900 S_ROUND(ofl->ofl_tlsphdr->p_memsz, 901 M_TLSSTATALIGN); 902 value = tlsstatsize - value; 903 904 /* 905 * Since this code is fixed up, it assumes a 906 * negative offset that can be added to the 907 * thread pointer. 908 */ 909 if ((arsp->rel_rtype == R_386_TLS_LDO_32) || 910 (arsp->rel_rtype == R_386_TLS_LE)) 911 value = -value; 912 } 913 914 if (arsp->rel_isdesc->is_file) 915 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 916 else 917 ifl_name = MSG_INTL(MSG_STR_NULL); 918 919 /* 920 * Make sure we have data to relocate. Compiler and 921 * assembler developers have been known to generate 922 * relocations against invalid sections (normally .bss), 923 * so for their benefit give them sufficient information 924 * to help analyze the problem. End users should never 925 * see this. 926 */ 927 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 928 Conv_inv_buf_t inv_buf; 929 930 eprintf(ofl->ofl_lml, ERR_FATAL, 931 MSG_INTL(MSG_REL_EMPTYSEC), 932 conv_reloc_386_type(arsp->rel_rtype, 933 0, &inv_buf), 934 ifl_name, demangle(arsp->rel_sname), 935 arsp->rel_isdesc->is_name); 936 return (S_ERROR); 937 } 938 939 /* 940 * Get the address of the data item we need to modify. 941 */ 942 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 943 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 944 is_indata)); 945 946 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 947 M_MACH, SHT_REL, arsp->rel_rtype, EC_NATPTR(addr), 948 value, arsp->rel_sname, arsp->rel_osdesc)); 949 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 950 951 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 952 ofl->ofl_size) || (arsp->rel_roffset > 953 arsp->rel_osdesc->os_shdr->sh_size)) { 954 Conv_inv_buf_t inv_buf; 955 int class; 956 957 if (((uintptr_t)addr - 958 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 959 class = ERR_FATAL; 960 else 961 class = ERR_WARNING; 962 963 eprintf(ofl->ofl_lml, class, 964 MSG_INTL(MSG_REL_INVALOFFSET), 965 conv_reloc_386_type(arsp->rel_rtype, 966 0, &inv_buf), 967 ifl_name, arsp->rel_isdesc->is_name, 968 demangle(arsp->rel_sname), 969 EC_ADDR((uintptr_t)addr - 970 (uintptr_t)ofl->ofl_nehdr)); 971 972 if (class == ERR_FATAL) { 973 return_code = S_ERROR; 974 continue; 975 } 976 } 977 978 /* 979 * The relocation is additive. Ignore the previous 980 * symbol value if this local partial symbol is 981 * expanded. 982 */ 983 if (moved) 984 value -= *addr; 985 986 /* 987 * If '-z noreloc' is specified - skip the do_reloc 988 * stage. 989 */ 990 if ((flags & FLG_OF_RELOBJ) || 991 !(dtflags1 & DF_1_NORELOC)) { 992 if (do_reloc((uchar_t)arsp->rel_rtype, addr, 993 &value, arsp->rel_sname, ifl_name, 994 ofl->ofl_lml) == 0) 995 return_code = S_ERROR; 996 } 997 } 998 } 999 return (return_code); 1000 } 1001 1002 /* 1003 * Add an output relocation record. 1004 */ 1005 uintptr_t 1006 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1007 { 1008 Rel_desc *orsp; 1009 Rel_cache *rcp; 1010 Sym_desc *sdp = rsp->rel_sym; 1011 1012 /* 1013 * Static executables *do not* want any relocations against them. 1014 * Since our engine still creates relocations against a WEAK UNDEFINED 1015 * symbol in a static executable, it's best to disable them here 1016 * instead of through out the relocation code. 1017 */ 1018 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 1019 (FLG_OF_STATIC | FLG_OF_EXEC)) 1020 return (1); 1021 1022 /* 1023 * If no relocation cache structures are available allocate 1024 * a new one and link it into the cache list. 1025 */ 1026 if ((ofl->ofl_outrels.tail == 0) || 1027 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1028 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1029 static size_t nextsize = 0; 1030 size_t size; 1031 1032 /* 1033 * Output relocation numbers can vary considerably between 1034 * building executables or shared objects (pic vs. non-pic), 1035 * etc. But, they typically aren't very large, so for these 1036 * objects use a standard bucket size. For building relocatable 1037 * objects, typically there will be an output relocation for 1038 * every input relocation. 1039 */ 1040 if (nextsize == 0) { 1041 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1042 if ((size = ofl->ofl_relocincnt) == 0) 1043 size = REL_LOIDESCNO; 1044 if (size > REL_HOIDESCNO) 1045 nextsize = REL_HOIDESCNO; 1046 else 1047 nextsize = REL_LOIDESCNO; 1048 } else 1049 nextsize = size = REL_HOIDESCNO; 1050 } else 1051 size = nextsize; 1052 1053 size = size * sizeof (Rel_desc); 1054 1055 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1056 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1057 return (S_ERROR); 1058 1059 /* LINTED */ 1060 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1061 /* LINTED */ 1062 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1063 } 1064 1065 /* 1066 * If we are adding a output relocation against a section 1067 * symbol (non-RELATIVE) then mark that section. These sections 1068 * will be added to the .dynsym symbol table. 1069 */ 1070 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1071 ((flags & FLG_REL_SCNNDX) || 1072 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1073 1074 /* 1075 * If this is a COMMON symbol - no output section 1076 * exists yet - (it's created as part of sym_validate()). 1077 * So - we mark here that when it's created it should 1078 * be tagged with the FLG_OS_OUTREL flag. 1079 */ 1080 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1081 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1082 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1083 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1084 else 1085 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1086 } else { 1087 Os_desc *osp = sdp->sd_isc->is_osdesc; 1088 1089 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1090 ofl->ofl_dynshdrcnt++; 1091 osp->os_flags |= FLG_OS_OUTREL; 1092 } 1093 } 1094 } 1095 1096 *orsp = *rsp; 1097 orsp->rel_flags |= flags; 1098 1099 rcp->rc_free++; 1100 ofl->ofl_outrelscnt++; 1101 1102 if (flags & FLG_REL_GOT) 1103 ofl->ofl_relocgotsz += (Xword)sizeof (Rel); 1104 else if (flags & FLG_REL_PLT) 1105 ofl->ofl_relocpltsz += (Xword)sizeof (Rel); 1106 else if (flags & FLG_REL_BSS) 1107 ofl->ofl_relocbsssz += (Xword)sizeof (Rel); 1108 else if (flags & FLG_REL_NOINFO) 1109 ofl->ofl_relocrelsz += (Xword)sizeof (Rel); 1110 else 1111 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rel); 1112 1113 if (orsp->rel_rtype == M_R_RELATIVE) 1114 ofl->ofl_relocrelcnt++; 1115 1116 /* 1117 * We don't perform sorting on PLT relocations because 1118 * they have already been assigned a PLT index and if we 1119 * were to sort them we would have to re-assign the plt indexes. 1120 */ 1121 if (!(flags & FLG_REL_PLT)) 1122 ofl->ofl_reloccnt++; 1123 1124 /* 1125 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1126 */ 1127 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1128 ofl->ofl_flags |= FLG_OF_BLDGOT; 1129 1130 /* 1131 * Identify and possibly warn of a displacement relocation. 1132 */ 1133 if (orsp->rel_flags & FLG_REL_DISP) { 1134 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1135 1136 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1137 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1138 } 1139 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL, 1140 M_MACH, orsp)); 1141 return (1); 1142 } 1143 1144 /* 1145 * Stub routine since register symbols are not supported on i386. 1146 */ 1147 /* ARGSUSED */ 1148 uintptr_t 1149 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1150 { 1151 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_NOREG)); 1152 return (S_ERROR); 1153 } 1154 1155 /* 1156 * process relocation for a LOCAL symbol 1157 */ 1158 uintptr_t 1159 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1160 { 1161 Word flags = ofl->ofl_flags; 1162 Sym_desc *sdp = rsp->rel_sym; 1163 Word shndx = sdp->sd_sym->st_shndx; 1164 1165 /* 1166 * if ((shared object) and (not pc relative relocation) and 1167 * (not against ABS symbol)) 1168 * then 1169 * build R_386_RELATIVE 1170 * fi 1171 */ 1172 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1173 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1174 !(IS_GOT_BASED(rsp->rel_rtype)) && 1175 !(rsp->rel_isdesc != NULL && 1176 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1177 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1178 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1179 Word ortype = rsp->rel_rtype; 1180 1181 rsp->rel_rtype = R_386_RELATIVE; 1182 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR) 1183 return (S_ERROR); 1184 rsp->rel_rtype = ortype; 1185 } 1186 1187 /* 1188 * If the relocation is against a 'non-allocatable' section 1189 * and we can not resolve it now - then give a warning 1190 * message. 1191 * 1192 * We can not resolve the symbol if either: 1193 * a) it's undefined 1194 * b) it's defined in a shared library and a 1195 * COPY relocation hasn't moved it to the executable 1196 * 1197 * Note: because we process all of the relocations against the 1198 * text segment before any others - we know whether 1199 * or not a copy relocation will be generated before 1200 * we get here (see reloc_init()->reloc_segments()). 1201 */ 1202 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1203 ((shndx == SHN_UNDEF) || 1204 ((sdp->sd_ref == REF_DYN_NEED) && 1205 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1206 Conv_inv_buf_t inv_buf; 1207 1208 /* 1209 * If the relocation is against a SHT_SUNW_ANNOTATE 1210 * section - then silently ignore that the relocation 1211 * can not be resolved. 1212 */ 1213 if (rsp->rel_osdesc && 1214 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1215 return (0); 1216 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), 1217 conv_reloc_386_type(rsp->rel_rtype, 0, &inv_buf), 1218 rsp->rel_isdesc->is_file->ifl_name, 1219 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1220 return (1); 1221 } 1222 1223 /* 1224 * Perform relocation. 1225 */ 1226 return (ld_add_actrel(NULL, rsp, ofl)); 1227 } 1228 1229 uintptr_t 1230 /* ARGSUSED */ 1231 ld_reloc_GOTOP(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1232 { 1233 /* 1234 * Stub routine for common code compatibility, we shouldn't 1235 * actually get here on x86. 1236 */ 1237 assert(0); 1238 return (S_ERROR); 1239 } 1240 1241 uintptr_t 1242 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1243 { 1244 Word rtype = rsp->rel_rtype; 1245 Sym_desc *sdp = rsp->rel_sym; 1246 Word flags = ofl->ofl_flags; 1247 Gotndx *gnp; 1248 1249 /* 1250 * If we're building an executable - use either the IE or LE access 1251 * model. If we're building a shared object process any IE model. 1252 */ 1253 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1254 /* 1255 * Set the DF_STATIC_TLS flag. 1256 */ 1257 ofl->ofl_dtflags |= DF_STATIC_TLS; 1258 1259 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1260 /* 1261 * Assign a GOT entry for static TLS references. 1262 */ 1263 if ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1264 GOT_REF_TLSIE, ofl, 0)) == 0) { 1265 1266 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1267 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1268 rtype, R_386_TLS_TPOFF, 0) == S_ERROR) 1269 return (S_ERROR); 1270 } 1271 1272 /* 1273 * IE access model. 1274 */ 1275 if (IS_TLS_IE(rtype)) { 1276 if (ld_add_actrel(FLG_REL_STLS, 1277 rsp, ofl) == S_ERROR) 1278 return (S_ERROR); 1279 1280 /* 1281 * A non-pic shared object needs to adjust the 1282 * active relocation (indntpoff). 1283 */ 1284 if (((flags & FLG_OF_EXEC) == 0) && 1285 (rtype == R_386_TLS_IE)) { 1286 rsp->rel_rtype = R_386_RELATIVE; 1287 return (ld_add_outrel(NULL, rsp, ofl)); 1288 } 1289 return (1); 1290 } 1291 1292 /* 1293 * Fixups are required for other executable models. 1294 */ 1295 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1296 rsp, ofl)); 1297 } 1298 1299 /* 1300 * LE access model. 1301 */ 1302 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32)) 1303 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1304 1305 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1306 rsp, ofl)); 1307 } 1308 1309 /* 1310 * Building a shared object. 1311 * 1312 * Assign a GOT entry for a dynamic TLS reference. 1313 */ 1314 if (IS_TLS_LD(rtype) && ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1315 GOT_REF_TLSLD, ofl, 0)) == 0)) { 1316 1317 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1318 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, 0) == S_ERROR) 1319 return (S_ERROR); 1320 1321 } else if (IS_TLS_GD(rtype) && 1322 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1323 ofl, 0)) == 0)) { 1324 1325 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1326 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32, 1327 R_386_TLS_DTPOFF32) == S_ERROR) 1328 return (S_ERROR); 1329 } 1330 1331 /* 1332 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1333 * cause a call to __tls_get_addr(). Convert this relocation to that 1334 * symbol now, and prepare for the PLT magic. 1335 */ 1336 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) { 1337 Sym_desc *tlsgetsym; 1338 1339 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU), 1340 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1341 return (S_ERROR); 1342 1343 rsp->rel_sym = tlsgetsym; 1344 rsp->rel_sname = tlsgetsym->sd_name; 1345 rsp->rel_rtype = R_386_PLT32; 1346 1347 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1348 return (S_ERROR); 1349 1350 rsp->rel_sym = sdp; 1351 rsp->rel_sname = sdp->sd_name; 1352 rsp->rel_rtype = rtype; 1353 return (1); 1354 } 1355 1356 if (IS_TLS_LD(rtype)) 1357 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1358 1359 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1360 } 1361 1362 /* ARGSUSED3 */ 1363 Gotndx * 1364 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1365 { 1366 Listnode * lnp; 1367 Gotndx * gnp; 1368 1369 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1370 return (ofl->ofl_tlsldgotndx); 1371 1372 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1373 if (gnp->gn_gotref == gref) 1374 return (gnp); 1375 } 1376 return ((Gotndx *)0); 1377 } 1378 1379 Xword 1380 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1381 { 1382 Os_desc *osp = ofl->ofl_osgot; 1383 Sym_desc *sdp = rdesc->rel_sym; 1384 Xword gotndx; 1385 Gotref gref; 1386 Gotndx *gnp; 1387 1388 if (rdesc->rel_flags & FLG_REL_DTLS) 1389 gref = GOT_REF_TLSGD; 1390 else if (rdesc->rel_flags & FLG_REL_MTLS) 1391 gref = GOT_REF_TLSLD; 1392 else if (rdesc->rel_flags & FLG_REL_STLS) 1393 gref = GOT_REF_TLSIE; 1394 else 1395 gref = GOT_REF_GENERIC; 1396 1397 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, 0); 1398 assert(gnp); 1399 1400 gotndx = (Xword)gnp->gn_gotndx; 1401 1402 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1403 (rdesc->rel_rtype == R_386_TLS_DTPOFF32)) 1404 gotndx++; 1405 1406 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE))); 1407 } 1408 1409 1410 /* ARGSUSED4 */ 1411 uintptr_t 1412 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1413 Rel_desc * rsp, Sym_desc * sdp) 1414 { 1415 Gotndx *gnp; 1416 uint_t gotents; 1417 1418 if (pgnp) 1419 return (1); 1420 1421 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1422 gotents = 2; 1423 else 1424 gotents = 1; 1425 1426 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 1427 return (S_ERROR); 1428 gnp->gn_gotndx = ofl->ofl_gotcnt; 1429 gnp->gn_gotref = gref; 1430 1431 ofl->ofl_gotcnt += gotents; 1432 1433 if (gref == GOT_REF_TLSLD) { 1434 ofl->ofl_tlsldgotndx = gnp; 1435 return (1); 1436 } 1437 1438 if (list_appendc(lst, (void *)gnp) == 0) 1439 return (S_ERROR); 1440 1441 return (1); 1442 } 1443 1444 void 1445 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 1446 { 1447 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 1448 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++; 1449 ofl->ofl_flags |= FLG_OF_BLDGOT; 1450 } 1451 1452 /* 1453 * Initializes .got[0] with the _DYNAMIC symbol value. 1454 */ 1455 uintptr_t 1456 ld_fillin_gotplt(Ofl_desc *ofl) 1457 { 1458 Word flags = ofl->ofl_flags; 1459 1460 if (ofl->ofl_osgot) { 1461 Sym_desc *sdp; 1462 1463 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 1464 SYM_NOHASH, 0, ofl)) != NULL) { 1465 uchar_t *genptr; 1466 1467 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 1468 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 1469 /* LINTED */ 1470 *(Word *)genptr = (Word)sdp->sd_sym->st_value; 1471 } 1472 } 1473 1474 /* 1475 * Fill in the reserved slot in the procedure linkage table the first 1476 * entry is: 1477 * if (building a.out) { 1478 * PUSHL got[1] # the address of the link map entry 1479 * JMP * got[2] # the address of rtbinder 1480 * } else { 1481 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry 1482 * JMP * got[2]@GOT(%ebx) # the address of rtbinder 1483 * } 1484 */ 1485 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { 1486 uchar_t *pltent; 1487 1488 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 1489 if (!(flags & FLG_OF_SHAROBJ)) { 1490 pltent[0] = M_SPECIAL_INST; 1491 pltent[1] = M_PUSHL_DISP; 1492 pltent += 2; 1493 /* LINTED */ 1494 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1495 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE); 1496 pltent += 4; 1497 pltent[0] = M_SPECIAL_INST; 1498 pltent[1] = M_JMP_DISP_IND; 1499 pltent += 2; 1500 /* LINTED */ 1501 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1502 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE); 1503 } else { 1504 pltent[0] = M_SPECIAL_INST; 1505 pltent[1] = M_PUSHL_REG_DISP; 1506 pltent += 2; 1507 /* LINTED */ 1508 *(Word *)pltent = (Word)(M_GOT_XLINKMAP * 1509 M_GOT_ENTSIZE); 1510 pltent += 4; 1511 pltent[0] = M_SPECIAL_INST; 1512 pltent[1] = M_JMP_REG_DISP_IND; 1513 pltent += 2; 1514 /* LINTED */ 1515 *(Word *)pltent = (Word)(M_GOT_XRTLD * 1516 M_GOT_ENTSIZE); 1517 } 1518 } 1519 return (1); 1520 } 1521