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