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 2006 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 rtype, R_386_TLS_GOTIE, arsp->rel_roffset, 386 sdp->sd_name)); 387 arsp->rel_rtype = R_386_TLS_GOTIE; 388 arsp->rel_roffset += 5; 389 390 /* 391 * Addjust 'offset' to beginning of instruction 392 * sequence. 393 */ 394 offset -= 3; 395 r1 = (offset[2] & SIB_MSK_IND) >> 3; 396 (void) memcpy(offset, tlsinstr_gd_ie, 397 sizeof (tlsinstr_gd_ie)); 398 399 /* 400 * set register %r1 into the addl 401 * instruction. 402 */ 403 offset[0x7] |= r1; 404 return (FIX_RELOC); 405 406 case R_386_TLS_GD_PLT: 407 /* 408 * Fixup done via the TLS_GD relocation 409 */ 410 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 411 rtype, R_386_NONE, arsp->rel_roffset, 412 sdp->sd_name)); 413 return (FIX_DONE); 414 } 415 } 416 417 /* 418 * LE reference model 419 */ 420 switch (rtype) { 421 case R_386_TLS_GD: 422 /* 423 * Transition: 424 * 0x0 leal x@tlsgd(,r1,1), %eax 425 * 0x7 call ___tls_get_addr 426 * 0xc 427 * To: 428 * 0x0 movl %gs:0, %eax 429 * 0x6 addl $x@ntpoff, %eax 430 * 0xb nop 431 * 0xc 432 */ 433 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 434 rtype, R_386_TLS_LE, arsp->rel_roffset, sdp->sd_name)); 435 436 arsp->rel_rtype = R_386_TLS_LE; 437 arsp->rel_roffset += 4; 438 439 /* 440 * Addjust 'offset' to beginning of instruction 441 * sequence. 442 */ 443 offset -= 3; 444 (void) memcpy(offset, tlsinstr_gd_le, 445 sizeof (tlsinstr_gd_le)); 446 return (FIX_RELOC); 447 448 case R_386_TLS_GD_PLT: 449 case R_386_PLT32: 450 /* 451 * Fixup done via the TLS_GD relocation 452 */ 453 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 454 rtype, R_386_NONE, arsp->rel_roffset, sdp->sd_name)); 455 return (FIX_DONE); 456 457 case R_386_TLS_LDM_PLT: 458 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 459 rtype, R_386_NONE, arsp->rel_roffset, sdp->sd_name)); 460 461 /* 462 * Transition: 463 * call __tls_get_addr() 464 * to: 465 * nop 466 * nop 467 * nop 468 * nop 469 * nop 470 */ 471 *(offset - 1) = TLS_NOP; 472 *(offset) = TLS_NOP; 473 *(offset + 1) = TLS_NOP; 474 *(offset + 2) = TLS_NOP; 475 *(offset + 3) = TLS_NOP; 476 return (FIX_DONE); 477 478 case R_386_TLS_LDM: 479 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 480 rtype, R_386_NONE, arsp->rel_roffset, sdp->sd_name)); 481 482 /* 483 * Transition: 484 * 485 * 0x00 leal x1@tlsldm(%ebx), %eax 486 * 0x06 call ___tls_get_addr 487 * 488 * to: 489 * 490 * 0x00 movl %gs:0, %eax 491 */ 492 (void) memcpy(offset - 2, tlsinstr_gd_ie_movgs, 493 sizeof (tlsinstr_gd_ie_movgs)); 494 return (FIX_DONE); 495 496 case R_386_TLS_LDO_32: 497 /* 498 * Instructions: 499 * 500 * 0x10 leal x1@dtpoff(%eax), %edx R_386_TLS_LDO_32 501 * to 502 * 0x10 leal x1@ntpoff(%eax), %edx R_386_TLS_LE 503 * 504 */ 505 offset -= 2; 506 507 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 508 rtype, R_386_TLS_LE, arsp->rel_roffset, sdp->sd_name)); 509 arsp->rel_rtype = R_386_TLS_LE; 510 return (FIX_RELOC); 511 512 case R_386_TLS_GOTIE: 513 /* 514 * These transitions are a little different than the 515 * others, in that we could have multiple instructions 516 * pointed to by a single relocation. Depending upon the 517 * instruction, we perform a different code transition. 518 * 519 * Here's the known transitions: 520 * 521 * 1) movl foo@gotntpoff(%reg1), %reg2 522 * 0x8b, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 523 * 524 * 2) addl foo@gotntpoff(%reg1), %reg2 525 * 0x03, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff 526 * 527 * Transitions IE -> LE 528 * 529 * 1) movl $foo@ntpoff, %reg2 530 * 0xc7, 0xc0 | reg2, foo@ntpoff 531 * 532 * 2) addl $foo@ntpoff, %reg2 533 * 0x81, 0xc0 | reg2, foo@ntpoff 534 * 535 * Note: reg1 != 4 (%esp) 536 */ 537 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 538 rtype, R_386_TLS_LE, arsp->rel_roffset, sdp->sd_name)); 539 arsp->rel_rtype = R_386_TLS_LE; 540 541 offset -= 2; 542 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 543 if (offset[0] == 0x8b) { 544 /* case 1 above */ 545 offset[0] = 0xc7; /* movl */ 546 offset[1] = 0xc0 | r2; 547 return (FIX_RELOC); 548 } 549 550 if (offset[0] == 0x03) { 551 /* case 2 above */ 552 assert(offset[0] == 0x03); 553 offset[0] = 0x81; /* addl */ 554 offset[1] = 0xc0 | r2; 555 return (FIX_RELOC); 556 } 557 558 /* 559 * Unexpected instruction sequence - fatal error. 560 */ 561 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS), 562 conv_reloc_386_type(arsp->rel_rtype, 0), 563 arsp->rel_isdesc->is_file->ifl_name, 564 demangle(arsp->rel_sname), arsp->rel_isdesc->is_name, 565 EC_OFF(arsp->rel_roffset)); 566 return (FIX_ERROR); 567 568 case R_386_TLS_IE: 569 /* 570 * These transitions are a little different than the 571 * others, in that we could have multiple instructions 572 * pointed to by a single relocation. Depending upon the 573 * instruction, we perform a different code transition. 574 * 575 * Here's the known transitions: 576 * 1) movl foo@indntpoff, %eax 577 * 0xa1, foo@indntpoff 578 * 579 * 2) movl foo@indntpoff, %eax 580 * 0x8b, 0x05 | (reg << 3), foo@gotntpoff 581 * 582 * 3) addl foo@indntpoff, %eax 583 * 0x03, 0x05 | (reg << 3), foo@gotntpoff 584 * 585 * Transitions IE -> LE 586 * 587 * 1) movl $foo@ntpoff, %eax 588 * 0xb8, foo@ntpoff 589 * 590 * 2) movl $foo@ntpoff, %reg 591 * 0xc7, 0xc0 | reg, foo@ntpoff 592 * 593 * 3) addl $foo@ntpoff, %reg 594 * 0x81, 0xc0 | reg, foo@ntpoff 595 */ 596 arsp->rel_rtype = R_386_TLS_LE; 597 offset--; 598 if (offset[0] == 0xa1) { 599 /* case 1 above */ 600 offset[0] = 0xb8; /* movl */ 601 return (FIX_RELOC); 602 } 603 604 offset--; 605 if (offset[0] == 0x8b) { 606 /* case 2 above */ 607 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 608 offset[0] = 0xc7; /* movl */ 609 offset[1] = 0xc0 | r2; 610 return (FIX_RELOC); 611 } 612 if (offset[0] == 0x03) { 613 /* case 3 above */ 614 r2 = (offset[1] & MODRM_MSK_RO) >> 3; 615 offset[0] = 0x81; /* addl */ 616 offset[1] = 0xc0 | r2; 617 return (FIX_RELOC); 618 } 619 /* 620 * Unexpected instruction sequence - fatal error. 621 */ 622 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS), 623 conv_reloc_386_type(arsp->rel_rtype, 0), 624 arsp->rel_isdesc->is_file->ifl_name, 625 demangle(arsp->rel_sname), arsp->rel_isdesc->is_name, 626 EC_OFF(arsp->rel_roffset)); 627 return (FIX_ERROR); 628 } 629 return (FIX_RELOC); 630 } 631 632 uintptr_t 633 ld_do_activerelocs(Ofl_desc *ofl) 634 { 635 Rel_desc *arsp; 636 Rel_cache *rcp; 637 Listnode *lnp; 638 uintptr_t return_code = 1; 639 Word flags = ofl->ofl_flags; 640 Word dtflags1 = ofl->ofl_dtflags_1; 641 642 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 643 /* 644 * Process active relocations. 645 */ 646 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 647 /* LINTED */ 648 for (arsp = (Rel_desc *)(rcp + 1); 649 arsp < rcp->rc_free; arsp++) { 650 uchar_t *addr; 651 Xword value; 652 Sym_desc *sdp; 653 const char *ifl_name; 654 Xword refaddr; 655 int moved = 0; 656 Gotref gref; 657 658 /* 659 * If the section this relocation is against has been 660 * discarded (-zignore), then discard (skip) the 661 * relocation itself. 662 */ 663 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 664 ((arsp->rel_flags & 665 (FLG_REL_GOT | FLG_REL_BSS | 666 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 667 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 668 M_MACH, arsp)); 669 continue; 670 } 671 672 /* 673 * We deteremine what the 'got reference' 674 * model (if required) is at this point. This 675 * needs to be done before tls_fixup() since 676 * it may 'transition' our instructions. 677 * 678 * The got table entries have already been assigned, 679 * and we bind to those initial entries. 680 */ 681 if (arsp->rel_flags & FLG_REL_DTLS) 682 gref = GOT_REF_TLSGD; 683 else if (arsp->rel_flags & FLG_REL_MTLS) 684 gref = GOT_REF_TLSLD; 685 else if (arsp->rel_flags & FLG_REL_STLS) 686 gref = GOT_REF_TLSIE; 687 else 688 gref = GOT_REF_GENERIC; 689 690 /* 691 * Perform any required TLS fixups. 692 */ 693 if (arsp->rel_flags & FLG_REL_TLSFIX) { 694 Fixupret ret; 695 696 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 697 return (S_ERROR); 698 if (ret == FIX_DONE) 699 continue; 700 } 701 702 /* 703 * If this is a relocation against a move table, or 704 * expanded move table, adjust the relocation entries. 705 */ 706 if (arsp->rel_move) 707 ld_adj_movereloc(ofl, arsp); 708 709 sdp = arsp->rel_sym; 710 refaddr = arsp->rel_roffset + 711 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 712 713 if (arsp->rel_flags & FLG_REL_CLVAL) 714 value = 0; 715 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 716 STT_SECTION) { 717 Sym_desc *sym; 718 719 /* 720 * The value for a symbol pointing to a SECTION 721 * is based off of that sections position. 722 * 723 * The second argument of the ld_am_I_partial() 724 * is the value stored at the target address 725 * relocation is going to be applied. 726 */ 727 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 728 /* LINTED */ 729 (sym = ld_am_I_partial(arsp, *(Xword *) 730 ((uchar_t *) 731 arsp->rel_isdesc->is_indata->d_buf + 732 arsp->rel_roffset)))) { 733 /* 734 * If the symbol is moved, 735 * adjust the value 736 */ 737 value = sym->sd_sym->st_value; 738 moved = 1; 739 } else { 740 value = _elf_getxoff( 741 sdp->sd_isc->is_indata); 742 if (sdp->sd_isc->is_shdr->sh_flags & 743 SHF_ALLOC) 744 value += sdp->sd_isc-> 745 is_osdesc->os_shdr->sh_addr; 746 } 747 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 748 value -= ofl->ofl_tlsphdr->p_vaddr; 749 } else { 750 /* 751 * else the value is the symbols value 752 */ 753 value = sdp->sd_sym->st_value; 754 } 755 756 /* 757 * Relocation against the GLOBAL_OFFSET_TABLE. 758 */ 759 if (arsp->rel_flags & FLG_REL_GOT) 760 arsp->rel_osdesc = ofl->ofl_osgot; 761 762 /* 763 * If loadable and not producing a relocatable object 764 * add the sections virtual address to the reference 765 * address. 766 */ 767 if ((arsp->rel_flags & FLG_REL_LOAD) && 768 ((flags & FLG_OF_RELOBJ) == 0)) 769 refaddr += arsp->rel_isdesc->is_osdesc-> 770 os_shdr->sh_addr; 771 772 /* 773 * If this entry has a PLT assigned to it, it's 774 * value is actually the address of the PLT (and 775 * not the address of the function). 776 */ 777 if (IS_PLT(arsp->rel_rtype)) { 778 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 779 value = ld_calc_plt_addr(sdp, ofl); 780 } 781 782 /* 783 * Determine whether the value needs further adjustment. 784 * Filter through the attributes of the relocation to 785 * determine what adjustment is required. Note, many 786 * of the following cases are only applicable when a 787 * .got is present. As a .got is not generated when a 788 * relocatable object is being built, any adjustments 789 * that require a .got need to be skipped. 790 */ 791 if ((arsp->rel_flags & FLG_REL_GOT) && 792 ((flags & FLG_OF_RELOBJ) == 0)) { 793 Xword R1addr; 794 uintptr_t R2addr; 795 Word gotndx; 796 Gotndx *gnp; 797 798 /* 799 * Perform relocation against GOT table. Since 800 * this doesn't fit exactly into a relocation 801 * we place the appropriate byte in the GOT 802 * directly 803 * 804 * Calculate offset into GOT at which to apply 805 * the relocation. 806 */ 807 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 808 ofl, 0); 809 assert(gnp); 810 811 if (arsp->rel_rtype == R_386_TLS_DTPOFF32) 812 gotndx = gnp->gn_gotndx + 1; 813 else 814 gotndx = gnp->gn_gotndx; 815 816 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE); 817 818 /* 819 * Add the GOTs data's offset. 820 */ 821 R2addr = R1addr + (uintptr_t) 822 arsp->rel_osdesc->os_outdata->d_buf; 823 824 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 825 ELF_DBG_LD, M_MACH, SHT_REL, 826 arsp->rel_rtype, R1addr, value, 827 arsp->rel_sname, arsp->rel_osdesc)); 828 829 /* 830 * And do it. 831 */ 832 *(Xword *)R2addr = value; 833 continue; 834 835 } else if (IS_GOT_BASED(arsp->rel_rtype) && 836 ((flags & FLG_OF_RELOBJ) == 0)) { 837 value -= ofl->ofl_osgot->os_shdr->sh_addr; 838 839 } else if (IS_GOT_PC(arsp->rel_rtype) && 840 ((flags & FLG_OF_RELOBJ) == 0)) { 841 value = 842 (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) - 843 refaddr; 844 845 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) && 846 (((flags & FLG_OF_RELOBJ) == 0) || 847 (arsp->rel_osdesc == sdp->sd_isc->is_osdesc))) { 848 value -= refaddr; 849 850 } else if (IS_TLS_INS(arsp->rel_rtype) && 851 IS_GOT_RELATIVE(arsp->rel_rtype) && 852 ((flags & FLG_OF_RELOBJ) == 0)) { 853 Gotndx *gnp; 854 855 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 856 ofl, 0); 857 assert(gnp); 858 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 859 if (arsp->rel_rtype == R_386_TLS_IE) { 860 value += 861 ofl->ofl_osgot->os_shdr->sh_addr; 862 } 863 864 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 865 ((flags & FLG_OF_RELOBJ) == 0)) { 866 Gotndx *gnp; 867 868 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 869 GOT_REF_GENERIC, ofl, 0); 870 assert(gnp); 871 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE; 872 873 } else if ((arsp->rel_flags & FLG_REL_STLS) && 874 ((flags & FLG_OF_RELOBJ) == 0)) { 875 Xword tlsstatsize; 876 877 /* 878 * This is the LE TLS reference model. Static 879 * offset is hard-coded. 880 */ 881 tlsstatsize = 882 S_ROUND(ofl->ofl_tlsphdr->p_memsz, 883 M_TLSSTATALIGN); 884 value = tlsstatsize - value; 885 886 /* 887 * Since this code is fixed up, it assumes a 888 * negative offset that can be added to the 889 * thread pointer. 890 */ 891 if ((arsp->rel_rtype == R_386_TLS_LDO_32) || 892 (arsp->rel_rtype == R_386_TLS_LE)) 893 value = -value; 894 } 895 896 if (arsp->rel_isdesc->is_file) 897 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 898 else 899 ifl_name = MSG_INTL(MSG_STR_NULL); 900 901 /* 902 * Make sure we have data to relocate. Compiler and 903 * assembler developers have been known to generate 904 * relocations against invalid sections (normally .bss), 905 * so for their benefit give them sufficient information 906 * to help analyze the problem. End users should never 907 * see this. 908 */ 909 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 910 eprintf(ofl->ofl_lml, ERR_FATAL, 911 MSG_INTL(MSG_REL_EMPTYSEC), 912 conv_reloc_386_type(arsp->rel_rtype, 0), 913 ifl_name, demangle(arsp->rel_sname), 914 arsp->rel_isdesc->is_name); 915 return (S_ERROR); 916 } 917 918 /* 919 * Get the address of the data item we need to modify. 920 */ 921 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 922 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 923 is_indata)); 924 925 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 926 M_MACH, SHT_REL, arsp->rel_rtype, EC_NATPTR(addr), 927 value, arsp->rel_sname, arsp->rel_osdesc)); 928 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 929 930 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 931 ofl->ofl_size) || (arsp->rel_roffset > 932 arsp->rel_osdesc->os_shdr->sh_size)) { 933 int class; 934 935 if (((uintptr_t)addr - 936 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 937 class = ERR_FATAL; 938 else 939 class = ERR_WARNING; 940 941 eprintf(ofl->ofl_lml, class, 942 MSG_INTL(MSG_REL_INVALOFFSET), 943 conv_reloc_386_type(arsp->rel_rtype, 0), 944 ifl_name, arsp->rel_isdesc->is_name, 945 demangle(arsp->rel_sname), 946 EC_ADDR((uintptr_t)addr - 947 (uintptr_t)ofl->ofl_nehdr)); 948 949 if (class == ERR_FATAL) { 950 return_code = S_ERROR; 951 continue; 952 } 953 } 954 955 /* 956 * The relocation is additive. Ignore the previous 957 * symbol value if this local partial symbol is 958 * expanded. 959 */ 960 if (moved) 961 value -= *addr; 962 963 /* 964 * If '-z noreloc' is specified - skip the do_reloc 965 * stage. 966 */ 967 if ((flags & FLG_OF_RELOBJ) || 968 !(dtflags1 & DF_1_NORELOC)) { 969 if (do_reloc((uchar_t)arsp->rel_rtype, addr, 970 &value, arsp->rel_sname, ifl_name, 971 ofl->ofl_lml) == 0) 972 return_code = S_ERROR; 973 } 974 } 975 } 976 return (return_code); 977 } 978 979 /* 980 * Add an output relocation record. 981 */ 982 uintptr_t 983 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 984 { 985 Rel_desc *orsp; 986 Rel_cache *rcp; 987 Sym_desc *sdp = rsp->rel_sym; 988 989 /* 990 * Static executables *do not* want any relocations against them. 991 * Since our engine still creates relocations against a WEAK UNDEFINED 992 * symbol in a static executable, it's best to disable them here 993 * instead of through out the relocation code. 994 */ 995 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 996 (FLG_OF_STATIC | FLG_OF_EXEC)) 997 return (1); 998 999 /* 1000 * If no relocation cache structures are available allocate 1001 * a new one and link it into the cache list. 1002 */ 1003 if ((ofl->ofl_outrels.tail == 0) || 1004 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1005 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1006 static size_t nextsize = 0; 1007 size_t size; 1008 1009 /* 1010 * Output relocation numbers can vary considerably between 1011 * building executables or shared objects (pic vs. non-pic), 1012 * etc. But, they typically aren't very large, so for these 1013 * objects use a standard bucket size. For building relocatable 1014 * objects, typically there will be an output relocation for 1015 * every input relocation. 1016 */ 1017 if (nextsize == 0) { 1018 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1019 if ((size = ofl->ofl_relocincnt) == 0) 1020 size = REL_LOIDESCNO; 1021 if (size > REL_HOIDESCNO) 1022 nextsize = REL_HOIDESCNO; 1023 else 1024 nextsize = REL_LOIDESCNO; 1025 } else 1026 nextsize = size = REL_HOIDESCNO; 1027 } else 1028 size = nextsize; 1029 1030 size = size * sizeof (Rel_desc); 1031 1032 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1033 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1034 return (S_ERROR); 1035 1036 /* LINTED */ 1037 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1038 /* LINTED */ 1039 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1040 } 1041 1042 /* 1043 * If we are adding a output relocation against a section 1044 * symbol (non-RELATIVE) then mark that section. These sections 1045 * will be added to the .dynsym symbol table. 1046 */ 1047 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1048 ((flags & FLG_REL_SCNNDX) || 1049 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1050 1051 /* 1052 * If this is a COMMON symbol - no output section 1053 * exists yet - (it's created as part of sym_validate()). 1054 * So - we mark here that when it's created it should 1055 * be tagged with the FLG_OS_OUTREL flag. 1056 */ 1057 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1058 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1059 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1060 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1061 else 1062 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1063 } else { 1064 Os_desc *osp = sdp->sd_isc->is_osdesc; 1065 1066 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1067 ofl->ofl_dynshdrcnt++; 1068 osp->os_flags |= FLG_OS_OUTREL; 1069 } 1070 } 1071 } 1072 1073 *orsp = *rsp; 1074 orsp->rel_flags |= flags; 1075 1076 rcp->rc_free++; 1077 ofl->ofl_outrelscnt++; 1078 1079 if (flags & FLG_REL_GOT) 1080 ofl->ofl_relocgotsz += (Xword)sizeof (Rel); 1081 else if (flags & FLG_REL_PLT) 1082 ofl->ofl_relocpltsz += (Xword)sizeof (Rel); 1083 else if (flags & FLG_REL_BSS) 1084 ofl->ofl_relocbsssz += (Xword)sizeof (Rel); 1085 else if (flags & FLG_REL_NOINFO) 1086 ofl->ofl_relocrelsz += (Xword)sizeof (Rel); 1087 else 1088 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rel); 1089 1090 if (orsp->rel_rtype == M_R_RELATIVE) 1091 ofl->ofl_relocrelcnt++; 1092 1093 /* 1094 * We don't perform sorting on PLT relocations because 1095 * they have already been assigned a PLT index and if we 1096 * were to sort them we would have to re-assign the plt indexes. 1097 */ 1098 if (!(flags & FLG_REL_PLT)) 1099 ofl->ofl_reloccnt++; 1100 1101 /* 1102 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1103 */ 1104 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1105 ofl->ofl_flags |= FLG_OF_BLDGOT; 1106 1107 /* 1108 * Identify and possibly warn of a displacement relocation. 1109 */ 1110 if (orsp->rel_flags & FLG_REL_DISP) { 1111 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1112 1113 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1114 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1115 } 1116 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL, 1117 M_MACH, orsp)); 1118 return (1); 1119 } 1120 1121 /* 1122 * Stub routine since register symbols are not supported on i386. 1123 */ 1124 /* ARGSUSED */ 1125 uintptr_t 1126 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1127 { 1128 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_NOREG)); 1129 return (S_ERROR); 1130 } 1131 1132 /* 1133 * process relocation for a LOCAL symbol 1134 */ 1135 uintptr_t 1136 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1137 { 1138 Word flags = ofl->ofl_flags; 1139 Sym_desc *sdp = rsp->rel_sym; 1140 Word shndx = sdp->sd_sym->st_shndx; 1141 1142 /* 1143 * if ((shared object) and (not pc relative relocation) and 1144 * (not against ABS symbol)) 1145 * then 1146 * build R_386_RELATIVE 1147 * fi 1148 */ 1149 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1150 !(IS_PC_RELATIVE(rsp->rel_rtype)) && 1151 !(IS_GOT_BASED(rsp->rel_rtype)) && 1152 !(rsp->rel_isdesc != NULL && 1153 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1154 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1155 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1156 Word ortype = rsp->rel_rtype; 1157 1158 rsp->rel_rtype = R_386_RELATIVE; 1159 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR) 1160 return (S_ERROR); 1161 rsp->rel_rtype = ortype; 1162 } 1163 1164 /* 1165 * If the relocation is against a 'non-allocatable' section 1166 * and we can not resolve it now - then give a warning 1167 * message. 1168 * 1169 * We can not resolve the symbol if either: 1170 * a) it's undefined 1171 * b) it's defined in a shared library and a 1172 * COPY relocation hasn't moved it to the executable 1173 * 1174 * Note: because we process all of the relocations against the 1175 * text segment before any others - we know whether 1176 * or not a copy relocation will be generated before 1177 * we get here (see reloc_init()->reloc_segments()). 1178 */ 1179 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1180 ((shndx == SHN_UNDEF) || 1181 ((sdp->sd_ref == REF_DYN_NEED) && 1182 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1183 /* 1184 * If the relocation is against a SHT_SUNW_ANNOTATE 1185 * section - then silently ignore that the relocation 1186 * can not be resolved. 1187 */ 1188 if (rsp->rel_osdesc && 1189 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1190 return (0); 1191 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM), 1192 conv_reloc_386_type(rsp->rel_rtype, 0), 1193 rsp->rel_isdesc->is_file->ifl_name, 1194 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1195 return (1); 1196 } 1197 1198 /* 1199 * Perform relocation. 1200 */ 1201 return (ld_add_actrel(NULL, rsp, ofl)); 1202 } 1203 1204 uintptr_t 1205 /* ARGSUSED */ 1206 ld_reloc_GOTOP(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1207 { 1208 /* 1209 * Stub routine for common code compatibility, we shouldn't 1210 * actually get here on x86. 1211 */ 1212 assert(0); 1213 return (S_ERROR); 1214 } 1215 1216 uintptr_t 1217 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl) 1218 { 1219 Word rtype = rsp->rel_rtype; 1220 Sym_desc *sdp = rsp->rel_sym; 1221 Word flags = ofl->ofl_flags; 1222 Gotndx *gnp; 1223 1224 /* 1225 * If we're building an executable - use either the IE or LE access 1226 * model. If we're building a shared object process any IE model. 1227 */ 1228 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1229 /* 1230 * Set the DF_STATIC_TLS flag. 1231 */ 1232 ofl->ofl_dtflags |= DF_STATIC_TLS; 1233 1234 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1235 /* 1236 * Assign a GOT entry for static TLS references. 1237 */ 1238 if ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1239 GOT_REF_TLSIE, ofl, 0)) == 0) { 1240 1241 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1242 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1243 rtype, R_386_TLS_TPOFF, 0) == S_ERROR) 1244 return (S_ERROR); 1245 } 1246 1247 /* 1248 * IE access model. 1249 */ 1250 if (IS_TLS_IE(rtype)) { 1251 if (ld_add_actrel(FLG_REL_STLS, 1252 rsp, ofl) == S_ERROR) 1253 return (S_ERROR); 1254 1255 /* 1256 * A non-pic shared object needs to adjust the 1257 * active relocation (indntpoff). 1258 */ 1259 if (((flags & FLG_OF_EXEC) == 0) && 1260 (rtype == R_386_TLS_IE)) { 1261 rsp->rel_rtype = R_386_RELATIVE; 1262 return (ld_add_outrel(NULL, rsp, ofl)); 1263 } 1264 return (1); 1265 } 1266 1267 /* 1268 * Fixups are required for other executable models. 1269 */ 1270 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1271 rsp, ofl)); 1272 } 1273 1274 /* 1275 * LE access model. 1276 */ 1277 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32)) 1278 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1279 1280 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1281 rsp, ofl)); 1282 } 1283 1284 /* 1285 * Building a shared object. 1286 * 1287 * Assign a GOT entry for a dynamic TLS reference. 1288 */ 1289 if (IS_TLS_LD(rtype) && ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1290 GOT_REF_TLSLD, ofl, 0)) == 0)) { 1291 1292 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1293 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, 0) == S_ERROR) 1294 return (S_ERROR); 1295 1296 } else if (IS_TLS_GD(rtype) && 1297 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1298 ofl, 0)) == 0)) { 1299 1300 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1301 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32, 1302 R_386_TLS_DTPOFF32) == S_ERROR) 1303 return (S_ERROR); 1304 } 1305 1306 /* 1307 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1308 * cause a call to __tls_get_addr(). Convert this relocation to that 1309 * symbol now, and prepare for the PLT magic. 1310 */ 1311 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) { 1312 Sym_desc * tlsgetsym; 1313 1314 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU), 1315 ofl)) == (Sym_desc *)S_ERROR) 1316 return (S_ERROR); 1317 1318 rsp->rel_sym = tlsgetsym; 1319 rsp->rel_sname = tlsgetsym->sd_name; 1320 rsp->rel_rtype = R_386_PLT32; 1321 1322 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1323 return (S_ERROR); 1324 1325 rsp->rel_sym = sdp; 1326 rsp->rel_sname = sdp->sd_name; 1327 rsp->rel_rtype = rtype; 1328 return (1); 1329 } 1330 1331 if (IS_TLS_LD(rtype)) 1332 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1333 1334 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1335 } 1336 1337 /* ARGSUSED3 */ 1338 Gotndx * 1339 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1340 { 1341 Listnode * lnp; 1342 Gotndx * gnp; 1343 1344 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1345 return (ofl->ofl_tlsldgotndx); 1346 1347 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1348 if (gnp->gn_gotref == gref) 1349 return (gnp); 1350 } 1351 return ((Gotndx *)0); 1352 } 1353 1354 Xword 1355 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1356 { 1357 Os_desc *osp = ofl->ofl_osgot; 1358 Sym_desc *sdp = rdesc->rel_sym; 1359 Xword gotndx; 1360 Gotref gref; 1361 Gotndx *gnp; 1362 1363 if (rdesc->rel_flags & FLG_REL_DTLS) 1364 gref = GOT_REF_TLSGD; 1365 else if (rdesc->rel_flags & FLG_REL_MTLS) 1366 gref = GOT_REF_TLSLD; 1367 else if (rdesc->rel_flags & FLG_REL_STLS) 1368 gref = GOT_REF_TLSIE; 1369 else 1370 gref = GOT_REF_GENERIC; 1371 1372 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, 0); 1373 assert(gnp); 1374 1375 gotndx = (Xword)gnp->gn_gotndx; 1376 1377 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1378 (rdesc->rel_rtype == R_386_TLS_DTPOFF32)) 1379 gotndx++; 1380 1381 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE))); 1382 } 1383 1384 1385 /* ARGSUSED4 */ 1386 uintptr_t 1387 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1388 Rel_desc * rsp, Sym_desc * sdp) 1389 { 1390 Gotndx *gnp; 1391 uint_t gotents; 1392 1393 if (pgnp) 1394 return (1); 1395 1396 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1397 gotents = 2; 1398 else 1399 gotents = 1; 1400 1401 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 1402 return (S_ERROR); 1403 gnp->gn_gotndx = ofl->ofl_gotcnt; 1404 gnp->gn_gotref = gref; 1405 1406 ofl->ofl_gotcnt += gotents; 1407 1408 if (gref == GOT_REF_TLSLD) { 1409 ofl->ofl_tlsldgotndx = gnp; 1410 return (1); 1411 } 1412 1413 if (list_appendc(lst, (void *)gnp) == 0) 1414 return (S_ERROR); 1415 1416 return (1); 1417 } 1418 1419 void 1420 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 1421 { 1422 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 1423 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++; 1424 ofl->ofl_flags |= FLG_OF_BLDGOT; 1425 } 1426 1427 /* 1428 * Initializes .got[0] with the _DYNAMIC symbol value. 1429 */ 1430 uintptr_t 1431 ld_fillin_gotplt(Ofl_desc *ofl) 1432 { 1433 Word flags = ofl->ofl_flags; 1434 1435 if (ofl->ofl_osgot) { 1436 Sym_desc *sdp; 1437 1438 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 1439 SYM_NOHASH, 0, ofl)) != NULL) { 1440 uchar_t *genptr; 1441 1442 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 1443 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 1444 /* LINTED */ 1445 *(Word *)genptr = (Word)sdp->sd_sym->st_value; 1446 } 1447 } 1448 1449 /* 1450 * Fill in the reserved slot in the procedure linkage table the first 1451 * entry is: 1452 * if (building a.out) { 1453 * PUSHL got[1] # the address of the link map entry 1454 * JMP * got[2] # the address of rtbinder 1455 * } else { 1456 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry 1457 * JMP * got[2]@GOT(%ebx) # the address of rtbinder 1458 * } 1459 */ 1460 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) { 1461 uchar_t *pltent; 1462 1463 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 1464 if (!(flags & FLG_OF_SHAROBJ)) { 1465 pltent[0] = M_SPECIAL_INST; 1466 pltent[1] = M_PUSHL_DISP; 1467 pltent += 2; 1468 /* LINTED */ 1469 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1470 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE); 1471 pltent += 4; 1472 pltent[0] = M_SPECIAL_INST; 1473 pltent[1] = M_JMP_DISP_IND; 1474 pltent += 2; 1475 /* LINTED */ 1476 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr-> 1477 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE); 1478 } else { 1479 pltent[0] = M_SPECIAL_INST; 1480 pltent[1] = M_PUSHL_REG_DISP; 1481 pltent += 2; 1482 /* LINTED */ 1483 *(Word *)pltent = (Word)(M_GOT_XLINKMAP * 1484 M_GOT_ENTSIZE); 1485 pltent += 4; 1486 pltent[0] = M_SPECIAL_INST; 1487 pltent[1] = M_JMP_REG_DISP_IND; 1488 pltent += 2; 1489 /* LINTED */ 1490 *(Word *)pltent = (Word)(M_GOT_XRTLD * 1491 M_GOT_ENTSIZE); 1492 } 1493 } 1494 return (1); 1495 } 1496