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; 650 651 if (ofl->ofl_actrels.head) 652 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 653 654 /* 655 * Process active relocations. 656 */ 657 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 658 /* LINTED */ 659 for (arsp = (Rel_desc *)(rcp + 1); 660 arsp < rcp->rc_free; arsp++) { 661 uchar_t *addr; 662 Xword value; 663 Sym_desc *sdp; 664 const char *ifl_name; 665 Xword refaddr; 666 int moved = 0; 667 Gotref gref; 668 669 /* 670 * If the section this relocation is against has been 671 * discarded (-zignore), then discard (skip) the 672 * relocation itself. 673 */ 674 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 675 ((arsp->rel_flags & 676 (FLG_REL_GOT | FLG_REL_BSS | 677 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 678 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 679 M_MACH, arsp)); 680 continue; 681 } 682 683 /* 684 * We deteremine what the 'got reference' 685 * model (if required) is at this point. This 686 * needs to be done before tls_fixup() since 687 * it may 'transition' our instructions. 688 * 689 * The got table entries have already been assigned, 690 * and we bind to those initial entries. 691 */ 692 if (arsp->rel_flags & FLG_REL_DTLS) 693 gref = GOT_REF_TLSGD; 694 else if (arsp->rel_flags & FLG_REL_MTLS) 695 gref = GOT_REF_TLSLD; 696 else if (arsp->rel_flags & FLG_REL_STLS) 697 gref = GOT_REF_TLSIE; 698 else 699 gref = GOT_REF_GENERIC; 700 701 /* 702 * Perform any required TLS fixups. 703 */ 704 if (arsp->rel_flags & FLG_REL_TLSFIX) { 705 Fixupret ret; 706 707 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 708 return (S_ERROR); 709 if (ret == FIX_DONE) 710 continue; 711 } 712 713 /* 714 * If this is a relocation against a move table, or 715 * expanded move table, adjust the relocation entries. 716 */ 717 if (arsp->rel_move) 718 ld_adj_movereloc(ofl, arsp); 719 720 sdp = arsp->rel_sym; 721 refaddr = arsp->rel_roffset + 722 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 723 724 if (arsp->rel_flags & FLG_REL_CLVAL) 725 value = 0; 726 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 727 STT_SECTION) { 728 Sym_desc *sym; 729 730 /* 731 * The value for a symbol pointing to a SECTION 732 * is based off of that sections position. 733 * 734 * The second argument of the ld_am_I_partial() 735 * is the value stored at the target address 736 * relocation is going to be applied. 737 */ 738 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 739 /* LINTED */ 740 (sym = ld_am_I_partial(arsp, *(Xword *) 741 ((uchar_t *) 742 arsp->rel_isdesc->is_indata->d_buf + 743 arsp->rel_roffset)))) { 744 /* 745 * If the symbol is moved, 746 * adjust the value 747 */ 748 value = sym->sd_sym->st_value; 749 moved = 1; 750 } else { 751 value = _elf_getxoff( 752 sdp->sd_isc->is_indata); 753 if (sdp->sd_isc->is_shdr->sh_flags & 754 SHF_ALLOC) 755 value += sdp->sd_isc-> 756 is_osdesc->os_shdr->sh_addr; 757 } 758 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 759 value -= ofl->ofl_tlsphdr->p_vaddr; 760 761 } else if (IS_SIZE(arsp->rel_rtype)) { 762 /* 763 * Size relocations require the symbols size. 764 */ 765 value = sdp->sd_sym->st_size; 766 } else { 767 /* 768 * Else the value is the symbols value. 769 */ 770 value = sdp->sd_sym->st_value; 771 } 772 773 /* 774 * Relocation against the GLOBAL_OFFSET_TABLE. 775 */ 776 if (arsp->rel_flags & FLG_REL_GOT) 777 arsp->rel_osdesc = ofl->ofl_osgot; 778 779 /* 780 * If loadable and not producing a relocatable object 781 * add the sections virtual address to the reference 782 * address. 783 */ 784 if ((arsp->rel_flags & FLG_REL_LOAD) && 785 ((flags & FLG_OF_RELOBJ) == 0)) 786 refaddr += arsp->rel_isdesc->is_osdesc-> 787 os_shdr->sh_addr; 788 789 /* 790 * If this entry has a PLT assigned to it, it's 791 * value is actually the address of the PLT (and 792 * not the address of the function). 793 */ 794 if (IS_PLT(arsp->rel_rtype)) { 795 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 796 value = ld_calc_plt_addr(sdp, ofl); 797 } 798 799 /* 800 * Determine whether the value needs further adjustment. 801 * Filter through the attributes of the relocation to 802 * determine what adjustment is required. Note, many 803 * of the following cases are only applicable when a 804 * .got is present. As a .got is not generated when a 805 * relocatable object is being built, any adjustments 806 * that require a .got need to be skipped. 807 */ 808 if ((arsp->rel_flags & FLG_REL_GOT) && 809 ((flags & FLG_OF_RELOBJ) == 0)) { 810 Xword R1addr; 811 uintptr_t R2addr; 812 Word gotndx; 813 Gotndx *gnp; 814 815 /* 816 * Perform relocation against GOT table. Since 817 * this doesn't fit exactly into a relocation 818 * we place the appropriate byte in the GOT 819 * directly 820 * 821 * Calculate offset into GOT at which to apply 822 * the relocation. 823 */ 824 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 825 ofl, 0); 826 assert(gnp); 827 828 if (arsp->rel_rtype == R_386_TLS_DTPOFF32) 829 gotndx = gnp->gn_gotndx + 1; 830 else 831 gotndx = gnp->gn_gotndx; 832 833 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE); 834 835 /* 836 * Add the GOTs data's offset. 837 */ 838 R2addr = R1addr + (uintptr_t) 839 arsp->rel_osdesc->os_outdata->d_buf; 840 841 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 842 ELF_DBG_LD, M_MACH, SHT_REL, 843 arsp->rel_rtype, R1addr, value, 844 arsp->rel_sname, arsp->rel_osdesc)); 845 846 /* 847 * And do it. 848 */ 849 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 850 *(Xword *)R2addr = 851 ld_byteswap_Xword(value); 852 else 853 *(Xword *)R2addr = value; 854 continue; 855 856 } else if (IS_GOT_BASED(arsp->rel_rtype) && 857 ((flags & FLG_OF_RELOBJ) == 0)) { 858 value -= ofl->ofl_osgot->os_shdr->sh_addr; 859 860 } else if (IS_GOT_PC(arsp->rel_rtype) && 861 ((flags & FLG_OF_RELOBJ) == 0)) { 862 value = 863 (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) - 864 refaddr; 865 866 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) && 867 (((flags & FLG_OF_RELOBJ) == 0) || 868 (arsp->rel_osdesc == sdp->sd_isc->is_osdesc))) { 869 value -= refaddr; 870 871 } else if (IS_TLS_INS(arsp->rel_rtype) && 872 IS_GOT_RELATIVE(arsp->rel_rtype) && 873 ((flags & FLG_OF_RELOBJ) == 0)) { 874 Gotndx *gnp; 875 876 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 877 ofl, 0); 878 assert(gnp); 879 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 880 if (arsp->rel_rtype == R_386_TLS_IE) { 881 value += 882 ofl->ofl_osgot->os_shdr->sh_addr; 883 } 884 885 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 886 ((flags & FLG_OF_RELOBJ) == 0)) { 887 Gotndx *gnp; 888 889 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 890 GOT_REF_GENERIC, ofl, 0); 891 assert(gnp); 892 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 893 894 } else if ((arsp->rel_flags & FLG_REL_STLS) && 895 ((flags & FLG_OF_RELOBJ) == 0)) { 896 Xword tlsstatsize; 897 898 /* 899 * This is the LE TLS reference model. Static 900 * offset is hard-coded. 901 */ 902 tlsstatsize = 903 S_ROUND(ofl->ofl_tlsphdr->p_memsz, 904 M_TLSSTATALIGN); 905 value = tlsstatsize - value; 906 907 /* 908 * Since this code is fixed up, it assumes a 909 * negative offset that can be added to the 910 * thread pointer. 911 */ 912 if ((arsp->rel_rtype == R_386_TLS_LDO_32) || 913 (arsp->rel_rtype == R_386_TLS_LE)) 914 value = -value; 915 } 916 917 if (arsp->rel_isdesc->is_file) 918 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 919 else 920 ifl_name = MSG_INTL(MSG_STR_NULL); 921 922 /* 923 * Make sure we have data to relocate. Compiler and 924 * assembler developers have been known to generate 925 * relocations against invalid sections (normally .bss), 926 * so for their benefit give them sufficient information 927 * to help analyze the problem. End users should never 928 * see this. 929 */ 930 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 931 Conv_inv_buf_t inv_buf; 932 933 eprintf(ofl->ofl_lml, ERR_FATAL, 934 MSG_INTL(MSG_REL_EMPTYSEC), 935 conv_reloc_386_type(arsp->rel_rtype, 936 0, &inv_buf), 937 ifl_name, demangle(arsp->rel_sname), 938 arsp->rel_isdesc->is_name); 939 return (S_ERROR); 940 } 941 942 /* 943 * Get the address of the data item we need to modify. 944 */ 945 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 946 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 947 is_indata)); 948 949 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 950 M_MACH, SHT_REL, arsp->rel_rtype, EC_NATPTR(addr), 951 value, arsp->rel_sname, arsp->rel_osdesc)); 952 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 953 954 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 955 ofl->ofl_size) || (arsp->rel_roffset > 956 arsp->rel_osdesc->os_shdr->sh_size)) { 957 Conv_inv_buf_t inv_buf; 958 int class; 959 960 if (((uintptr_t)addr - 961 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 962 class = ERR_FATAL; 963 else 964 class = ERR_WARNING; 965 966 eprintf(ofl->ofl_lml, class, 967 MSG_INTL(MSG_REL_INVALOFFSET), 968 conv_reloc_386_type(arsp->rel_rtype, 969 0, &inv_buf), 970 ifl_name, arsp->rel_isdesc->is_name, 971 demangle(arsp->rel_sname), 972 EC_ADDR((uintptr_t)addr - 973 (uintptr_t)ofl->ofl_nehdr)); 974 975 if (class == ERR_FATAL) { 976 return_code = S_ERROR; 977 continue; 978 } 979 } 980 981 /* 982 * The relocation is additive. Ignore the previous 983 * symbol value if this local partial symbol is 984 * expanded. 985 */ 986 if (moved) 987 value -= *addr; 988 989 /* 990 * If '-z noreloc' is specified - skip the do_reloc_ld 991 * stage. 992 */ 993 if (OFL_DO_RELOC(ofl)) { 994 if (do_reloc_ld((uchar_t)arsp->rel_rtype, addr, 995 &value, arsp->rel_sname, ifl_name, 996 OFL_SWAP_RELOC_DATA(ofl, arsp), 997 ofl->ofl_lml) == 0) 998 return_code = S_ERROR; 999 } 1000 } 1001 } 1002 return (return_code); 1003 } 1004 1005 /* 1006 * Add an output relocation record. 1007 */ 1008 uintptr_t 1009 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1010 { 1011 Rel_desc *orsp; 1012 Rel_cache *rcp; 1013 Sym_desc *sdp = rsp->rel_sym; 1014 1015 /* 1016 * Static executables *do not* want any relocations against them. 1017 * Since our engine still creates relocations against a WEAK UNDEFINED 1018 * symbol in a static executable, it's best to disable them here 1019 * instead of through out the relocation code. 1020 */ 1021 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 1022 (FLG_OF_STATIC | FLG_OF_EXEC)) 1023 return (1); 1024 1025 /* 1026 * If no relocation cache structures are available allocate 1027 * a new one and link it into the cache list. 1028 */ 1029 if ((ofl->ofl_outrels.tail == 0) || 1030 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1031 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1032 static size_t nextsize = 0; 1033 size_t size; 1034 1035 /* 1036 * Output relocation numbers can vary considerably between 1037 * building executables or shared objects (pic vs. non-pic), 1038 * etc. But, they typically aren't very large, so for these 1039 * objects use a standard bucket size. For building relocatable 1040 * objects, typically there will be an output relocation for 1041 * every input relocation. 1042 */ 1043 if (nextsize == 0) { 1044 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1045 if ((size = ofl->ofl_relocincnt) == 0) 1046 size = REL_LOIDESCNO; 1047 if (size > REL_HOIDESCNO) 1048 nextsize = REL_HOIDESCNO; 1049 else 1050 nextsize = REL_LOIDESCNO; 1051 } else 1052 nextsize = size = REL_HOIDESCNO; 1053 } else 1054 size = nextsize; 1055 1056 size = size * sizeof (Rel_desc); 1057 1058 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1059 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1060 return (S_ERROR); 1061 1062 /* LINTED */ 1063 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1064 /* LINTED */ 1065 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1066 } 1067 1068 /* 1069 * If we are adding a output relocation against a section 1070 * symbol (non-RELATIVE) then mark that section. These sections 1071 * will be added to the .dynsym symbol table. 1072 */ 1073 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1074 ((flags & FLG_REL_SCNNDX) || 1075 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1076 1077 /* 1078 * If this is a COMMON symbol - no output section 1079 * exists yet - (it's created as part of sym_validate()). 1080 * So - we mark here that when it's created it should 1081 * be tagged with the FLG_OS_OUTREL flag. 1082 */ 1083 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1084 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1085 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1086 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1087 else 1088 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1089 } else { 1090 Os_desc *osp = sdp->sd_isc->is_osdesc; 1091 1092 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1093 ofl->ofl_dynshdrcnt++; 1094 osp->os_flags |= FLG_OS_OUTREL; 1095 } 1096 } 1097 } 1098 1099 *orsp = *rsp; 1100 orsp->rel_flags |= flags; 1101 1102 rcp->rc_free++; 1103 ofl->ofl_outrelscnt++; 1104 1105 if (flags & FLG_REL_GOT) 1106 ofl->ofl_relocgotsz += (Xword)sizeof (Rel); 1107 else if (flags & FLG_REL_PLT) 1108 ofl->ofl_relocpltsz += (Xword)sizeof (Rel); 1109 else if (flags & FLG_REL_BSS) 1110 ofl->ofl_relocbsssz += (Xword)sizeof (Rel); 1111 else if (flags & FLG_REL_NOINFO) 1112 ofl->ofl_relocrelsz += (Xword)sizeof (Rel); 1113 else 1114 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rel); 1115 1116 if (orsp->rel_rtype == M_R_RELATIVE) 1117 ofl->ofl_relocrelcnt++; 1118 1119 /* 1120 * We don't perform sorting on PLT relocations because 1121 * they have already been assigned a PLT index and if we 1122 * were to sort them we would have to re-assign the plt indexes. 1123 */ 1124 if (!(flags & FLG_REL_PLT)) 1125 ofl->ofl_reloccnt++; 1126 1127 /* 1128 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1129 */ 1130 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1131 ofl->ofl_flags |= FLG_OF_BLDGOT; 1132 1133 /* 1134 * Identify and possibly warn of a displacement relocation. 1135 */ 1136 if (orsp->rel_flags & FLG_REL_DISP) { 1137 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1138 1139 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1140 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1141 } 1142 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL, 1143 M_MACH, orsp)); 1144 return (1); 1145 } 1146 1147 /* 1148 * Stub routine since register symbols are not supported on i386. 1149 */ 1150 /* ARGSUSED */ 1151 uintptr_t 1152 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1153 { 1154 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_NOREG)); 1155 return (S_ERROR); 1156 } 1157 1158 /* 1159 * process relocation for a LOCAL symbol 1160 */ 1161 uintptr_t 1162 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1163 { 1164 Word flags = ofl->ofl_flags; 1165 Sym_desc *sdp = rsp->rel_sym; 1166 Word shndx = sdp->sd_sym->st_shndx; 1167 1168 /* 1169 * if ((shared object) and (not pc relative relocation) and 1170 * (not against ABS symbol)) 1171 * then 1172 * build R_386_RELATIVE 1173 * fi 1174 */ 1175 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1176 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1177 !(IS_GOT_BASED(rsp->rel_rtype)) && 1178 !(rsp->rel_isdesc != NULL && 1179 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1180 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1181 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1182 Word ortype = rsp->rel_rtype; 1183 1184 rsp->rel_rtype = R_386_RELATIVE; 1185 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR) 1186 return (S_ERROR); 1187 rsp->rel_rtype = ortype; 1188 } 1189 1190 /* 1191 * If the relocation is against a 'non-allocatable' section 1192 * and we can not resolve it now - then give a warning 1193 * message. 1194 * 1195 * We can not resolve the symbol if either: 1196 * a) it's undefined 1197 * b) it's defined in a shared library and a 1198 * COPY relocation hasn't moved it to the executable 1199 * 1200 * Note: because we process all of the relocations against the 1201 * text segment before any others - we know whether 1202 * or not a copy relocation will be generated before 1203 * we get here (see reloc_init()->reloc_segments()). 1204 */ 1205 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1206 ((shndx == SHN_UNDEF) || 1207 ((sdp->sd_ref == REF_DYN_NEED) && 1208 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1209 Conv_inv_buf_t inv_buf; 1210 1211 /* 1212 * If the relocation is against a SHT_SUNW_ANNOTATE 1213 * section - then silently ignore that the relocation 1214 * can not be resolved. 1215 */ 1216 if (rsp->rel_osdesc && 1217 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1218 return (0); 1219 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), 1220 conv_reloc_386_type(rsp->rel_rtype, 0, &inv_buf), 1221 rsp->rel_isdesc->is_file->ifl_name, 1222 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1223 return (1); 1224 } 1225 1226 /* 1227 * Perform relocation. 1228 */ 1229 return (ld_add_actrel(NULL, rsp, ofl)); 1230 } 1231 1232 uintptr_t 1233 /* ARGSUSED */ 1234 ld_reloc_GOTOP(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1235 { 1236 /* 1237 * Stub routine for common code compatibility, we shouldn't 1238 * actually get here on x86. 1239 */ 1240 assert(0); 1241 return (S_ERROR); 1242 } 1243 1244 uintptr_t 1245 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1246 { 1247 Word rtype = rsp->rel_rtype; 1248 Sym_desc *sdp = rsp->rel_sym; 1249 Word flags = ofl->ofl_flags; 1250 Gotndx *gnp; 1251 1252 /* 1253 * If we're building an executable - use either the IE or LE access 1254 * model. If we're building a shared object process any IE model. 1255 */ 1256 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1257 /* 1258 * Set the DF_STATIC_TLS flag. 1259 */ 1260 ofl->ofl_dtflags |= DF_STATIC_TLS; 1261 1262 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1263 /* 1264 * Assign a GOT entry for static TLS references. 1265 */ 1266 if ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1267 GOT_REF_TLSIE, ofl, 0)) == 0) { 1268 1269 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1270 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1271 rtype, R_386_TLS_TPOFF, 0) == S_ERROR) 1272 return (S_ERROR); 1273 } 1274 1275 /* 1276 * IE access model. 1277 */ 1278 if (IS_TLS_IE(rtype)) { 1279 if (ld_add_actrel(FLG_REL_STLS, 1280 rsp, ofl) == S_ERROR) 1281 return (S_ERROR); 1282 1283 /* 1284 * A non-pic shared object needs to adjust the 1285 * active relocation (indntpoff). 1286 */ 1287 if (((flags & FLG_OF_EXEC) == 0) && 1288 (rtype == R_386_TLS_IE)) { 1289 rsp->rel_rtype = R_386_RELATIVE; 1290 return (ld_add_outrel(NULL, rsp, ofl)); 1291 } 1292 return (1); 1293 } 1294 1295 /* 1296 * Fixups are required for other executable models. 1297 */ 1298 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1299 rsp, ofl)); 1300 } 1301 1302 /* 1303 * LE access model. 1304 */ 1305 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32)) 1306 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1307 1308 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1309 rsp, ofl)); 1310 } 1311 1312 /* 1313 * Building a shared object. 1314 * 1315 * Assign a GOT entry for a dynamic TLS reference. 1316 */ 1317 if (IS_TLS_LD(rtype) && ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1318 GOT_REF_TLSLD, ofl, 0)) == 0)) { 1319 1320 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1321 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, 0) == S_ERROR) 1322 return (S_ERROR); 1323 1324 } else if (IS_TLS_GD(rtype) && 1325 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1326 ofl, 0)) == 0)) { 1327 1328 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1329 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32, 1330 R_386_TLS_DTPOFF32) == S_ERROR) 1331 return (S_ERROR); 1332 } 1333 1334 /* 1335 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1336 * cause a call to __tls_get_addr(). Convert this relocation to that 1337 * symbol now, and prepare for the PLT magic. 1338 */ 1339 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) { 1340 Sym_desc *tlsgetsym; 1341 1342 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU), 1343 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1344 return (S_ERROR); 1345 1346 rsp->rel_sym = tlsgetsym; 1347 rsp->rel_sname = tlsgetsym->sd_name; 1348 rsp->rel_rtype = R_386_PLT32; 1349 1350 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1351 return (S_ERROR); 1352 1353 rsp->rel_sym = sdp; 1354 rsp->rel_sname = sdp->sd_name; 1355 rsp->rel_rtype = rtype; 1356 return (1); 1357 } 1358 1359 if (IS_TLS_LD(rtype)) 1360 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1361 1362 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1363 } 1364 1365 /* ARGSUSED3 */ 1366 Gotndx * 1367 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1368 { 1369 Listnode * lnp; 1370 Gotndx * gnp; 1371 1372 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1373 return (ofl->ofl_tlsldgotndx); 1374 1375 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1376 if (gnp->gn_gotref == gref) 1377 return (gnp); 1378 } 1379 return ((Gotndx *)0); 1380 } 1381 1382 Xword 1383 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1384 { 1385 Os_desc *osp = ofl->ofl_osgot; 1386 Sym_desc *sdp = rdesc->rel_sym; 1387 Xword gotndx; 1388 Gotref gref; 1389 Gotndx *gnp; 1390 1391 if (rdesc->rel_flags & FLG_REL_DTLS) 1392 gref = GOT_REF_TLSGD; 1393 else if (rdesc->rel_flags & FLG_REL_MTLS) 1394 gref = GOT_REF_TLSLD; 1395 else if (rdesc->rel_flags & FLG_REL_STLS) 1396 gref = GOT_REF_TLSIE; 1397 else 1398 gref = GOT_REF_GENERIC; 1399 1400 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, 0); 1401 assert(gnp); 1402 1403 gotndx = (Xword)gnp->gn_gotndx; 1404 1405 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1406 (rdesc->rel_rtype == R_386_TLS_DTPOFF32)) 1407 gotndx++; 1408 1409 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE))); 1410 } 1411 1412 1413 /* ARGSUSED4 */ 1414 uintptr_t 1415 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1416 Rel_desc * rsp, Sym_desc * sdp) 1417 { 1418 Gotndx *gnp; 1419 uint_t gotents; 1420 1421 if (pgnp) 1422 return (1); 1423 1424 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1425 gotents = 2; 1426 else 1427 gotents = 1; 1428 1429 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 1430 return (S_ERROR); 1431 gnp->gn_gotndx = ofl->ofl_gotcnt; 1432 gnp->gn_gotref = gref; 1433 1434 ofl->ofl_gotcnt += gotents; 1435 1436 if (gref == GOT_REF_TLSLD) { 1437 ofl->ofl_tlsldgotndx = gnp; 1438 return (1); 1439 } 1440 1441 if (list_appendc(lst, (void *)gnp) == 0) 1442 return (S_ERROR); 1443 1444 return (1); 1445 } 1446 1447 void 1448 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 1449 { 1450 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 1451 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++; 1452 ofl->ofl_flags |= FLG_OF_BLDGOT; 1453 } 1454 1455 /* 1456 * Initializes .got[0] with the _DYNAMIC symbol value. 1457 */ 1458 uintptr_t 1459 ld_fillin_gotplt(Ofl_desc *ofl) 1460 { 1461 Word flags = ofl->ofl_flags; 1462 1463 if (ofl->ofl_osgot) { 1464 Sym_desc *sdp; 1465 1466 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 1467 SYM_NOHASH, 0, ofl)) != NULL) { 1468 uchar_t *genptr; 1469 1470 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 1471 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 1472 /* LINTED */ 1473 *(Word *)genptr = (Word)sdp->sd_sym->st_value; 1474 } 1475 } 1476 1477 /* 1478 * Fill in the reserved slot in the procedure linkage table the first 1479 * entry is: 1480 * if (building a.out) { 1481 * PUSHL got[1] # the address of the link map entry 1482 * JMP * got[2] # the address of rtbinder 1483 * } else { 1484 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry 1485 * JMP * got[2]@GOT(%ebx) # the address of rtbinder 1486 * } 1487 */ 1488 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { 1489 uchar_t *pltent; 1490 1491 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 1492 if (!(flags & FLG_OF_SHAROBJ)) { 1493 pltent[0] = M_SPECIAL_INST; 1494 pltent[1] = M_PUSHL_DISP; 1495 pltent += 2; 1496 /* LINTED */ 1497 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1498 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE); 1499 pltent += 4; 1500 pltent[0] = M_SPECIAL_INST; 1501 pltent[1] = M_JMP_DISP_IND; 1502 pltent += 2; 1503 /* LINTED */ 1504 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1505 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE); 1506 } else { 1507 pltent[0] = M_SPECIAL_INST; 1508 pltent[1] = M_PUSHL_REG_DISP; 1509 pltent += 2; 1510 /* LINTED */ 1511 *(Word *)pltent = (Word)(M_GOT_XLINKMAP * 1512 M_GOT_ENTSIZE); 1513 pltent += 4; 1514 pltent[0] = M_SPECIAL_INST; 1515 pltent[1] = M_JMP_REG_DISP_IND; 1516 pltent += 2; 1517 /* LINTED */ 1518 *(Word *)pltent = (Word)(M_GOT_XRTLD * 1519 M_GOT_ENTSIZE); 1520 } 1521 } 1522 return (1); 1523 } 1524