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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 1988 AT&T 29 * All Rights Reserved 30 */ 31 32 #pragma ident "%Z%%M% %I% %E% SMI" 33 34 /* 35 * SPARC machine dependent and a.out format file class dependent functions. 36 * Contains routines for performing function binding and symbol relocations. 37 */ 38 39 #include <stdio.h> 40 #include <sys/types.h> 41 #include <sys/mman.h> 42 #include <synch.h> 43 #include <dlfcn.h> 44 #include <debug.h> 45 #include "_a.out.h" 46 #include "_rtld.h" 47 #include "_audit.h" 48 #include "msg.h" 49 50 extern void iflush_range(caddr_t, size_t); 51 52 /* 53 * Function binding routine - invoked on the first call to a function through 54 * the procedure linkage table; 55 * passes first through an assembly language interface. 56 * 57 * Takes the address of the PLT entry where the call originated, 58 * the offset into the relocation table of the associated 59 * relocation entry and the address of the link map (rt_private_map struct) 60 * for the entry. 61 * 62 * Returns the address of the function referenced after re-writing the PLT 63 * entry to invoke the function directly. 64 * 65 * On error, causes process to terminate with a signal. 66 */ 67 ulong_t 68 aout_bndr(caddr_t pc) 69 { 70 Rt_map *lmp, *nlmp, *llmp; 71 struct relocation_info *rp; 72 struct nlist *sp; 73 Sym *sym; 74 char *name; 75 int rndx, entry; 76 ulong_t symval; 77 Slookup sl; 78 uint_t binfo; 79 Lm_list *lml; 80 81 /* 82 * For compatibility with libthread (TI_VERSION 1) we track the entry 83 * value. A zero value indicates we have recursed into ld.so.1 to 84 * further process a locking request (see comments in completion()). 85 * Under this recursion we disable tsort and cleanup activities. 86 */ 87 entry = enter(0); 88 89 for (lmp = lml_main.lm_head; lmp; lmp = (Rt_map *)NEXT(lmp)) { 90 if (FCT(lmp) == &aout_fct) { 91 if (pc > (caddr_t)(LM2LP(lmp)->lp_plt) && 92 pc < (caddr_t)((int)LM2LP(lmp)->lp_plt + 93 AOUTDYN(lmp)->v2->ld_plt_sz)) { 94 break; 95 } 96 } 97 } 98 99 #define LAST22BITS 0x3fffff 100 101 /* LINTED */ 102 rndx = *(int *)(pc + (sizeof (ulong_t *) * 2)) & LAST22BITS; 103 rp = &LM2LP(lmp)->lp_rp[rndx]; 104 sp = &LM2LP(lmp)->lp_symtab[rp->r_symbolnum]; 105 name = &LM2LP(lmp)->lp_symstr[sp->n_un.n_strx]; 106 107 /* 108 * Determine the last link-map of this list, this'll be the starting 109 * point for any tsort() processing. 110 */ 111 lml = LIST(lmp); 112 llmp = lml->lm_tail; 113 114 /* 115 * Find definition for symbol. Initialize the symbol lookup data 116 * structure. 117 */ 118 SLOOKUP_INIT(sl, name, lmp, lml->lm_head, ld_entry_cnt, 0, 0, 0, 0, 119 LKUP_DEFT); 120 121 if ((sym = aout_lookup_sym(&sl, &nlmp, &binfo, NULL)) == 0) { 122 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_REL_NOSYM), NAME(lmp), 123 demangle(name)); 124 rtldexit(lml, 1); 125 } 126 127 symval = sym->st_value; 128 if (!(FLAGS(nlmp) & FLG_RT_FIXED) && 129 (sym->st_shndx != SHN_ABS)) 130 symval += (int)(ADDR(nlmp)); 131 if ((lmp != nlmp) && ((FLAGS1(nlmp) & FL1_RT_NOINIFIN) == 0)) { 132 /* 133 * Record that this new link map is now bound to the caller. 134 */ 135 if (bind_one(lmp, nlmp, BND_REFER) == 0) 136 rtldexit(lml, 1); 137 } 138 139 /* 140 * Print binding information and rebuild PLT entry. 141 */ 142 DBG_CALL(Dbg_bind_global(lmp, (Addr)(ADDR(lmp) + rp->r_address), 143 (Off)rp->r_address, (Xword)(-1), PLT_T_NONE, nlmp, 144 (Addr)symval, sym->st_value, name, binfo)); 145 146 if (!(rtld_flags & RT_FL_NOBIND)) 147 aout_plt_write((caddr_t)(ADDR(lmp) + rp->r_address), symval); 148 149 /* 150 * Complete any processing for newly loaded objects. Note we don't 151 * know exactly where any new objects are loaded (we know the object 152 * that supplied the symbol, but others may have been loaded lazily as 153 * we searched for the symbol), so sorting starts from the last 154 * link-map know on entry to this routine. 155 */ 156 if (entry) 157 load_completion(llmp); 158 159 /* 160 * If the object we've bound to is in the process of being initialized 161 * by another thread, determine whether we should block. 162 */ 163 is_dep_ready(nlmp, lmp, DBG_WAIT_SYMBOL); 164 165 /* 166 * Make sure the object to which we've bound has had it's .init fired. 167 * Cleanup before return to user code. 168 */ 169 if (entry) { 170 is_dep_init(nlmp, lmp); 171 leave(lml, 0); 172 } 173 174 return (symval); 175 } 176 177 178 #define IS_PC_RELATIVE(X) (pc_rel_type[(X)] == 1) 179 180 static const uchar_t pc_rel_type[] = { 181 0, /* RELOC_8 */ 182 0, /* RELOC_16 */ 183 0, /* RELOC_32 */ 184 1, /* RELOC_DISP8 */ 185 1, /* RELOC_DISP16 */ 186 1, /* RELOC_DISP32 */ 187 1, /* RELOC_WDISP30 */ 188 1, /* RELOC_WDISP22 */ 189 0, /* RELOC_HI22 */ 190 0, /* RELOC_22 */ 191 0, /* RELOC_13 */ 192 0, /* RELOC_LO10 */ 193 0, /* RELOC_SFA_BASE */ 194 0, /* RELOC_SFA_OFF13 */ 195 0, /* RELOC_BASE10 */ 196 0, /* RELOC_BASE13 */ 197 0, /* RELOC_BASE22 */ 198 0, /* RELOC_PC10 */ 199 0, /* RELOC_PC22 */ 200 0, /* RELOC_JMP_TBL */ 201 0, /* RELOC_SEGOFF16 */ 202 0, /* RELOC_GLOB_DAT */ 203 0, /* RELOC_JMP_SLOT */ 204 0 /* RELOC_RELATIVE */ 205 }; 206 207 int 208 aout_reloc(Rt_map * lmp, uint_t plt, int *in_nfavl) 209 { 210 int k; /* loop temporary */ 211 int nr; /* number of relocations */ 212 char *name; /* symbol being searched for */ 213 long *et; /* cached _etext of object */ 214 long value; /* relocation temporary */ 215 long *ra; /* cached relocation address */ 216 struct relocation_info *rp; /* current relocation */ 217 struct nlist *sp; /* symbol table of "symbol" */ 218 Rt_map * _lmp; /* lm which holds symbol definition */ 219 Sym * sym; /* symbol definition */ 220 int textrel = 0, ret = 1; 221 APlist *bound = NULL; 222 Lm_list *lml = LIST(lmp); 223 224 DBG_CALL(Dbg_reloc_run(lmp, SHT_RELA, plt, DBG_REL_START)); 225 226 /* 227 * If we've been called upon to promote an RTLD_LAZY object to an 228 * RTLD_NOW don't bother to do anything - a.out's are bound as if 229 * RTLD_NOW regardless. 230 */ 231 if (plt) 232 return (1); 233 234 rp = LM2LP(lmp)->lp_rp; 235 et = (long *)ETEXT(lmp); 236 nr = GETRELSZ(AOUTDYN(lmp)) / sizeof (struct relocation_info); 237 238 /* 239 * Initialize _PLT_, if any. 240 */ 241 if (AOUTDYN(lmp)->v2->ld_plt_sz) 242 aout_plt_write((caddr_t)LM2LP(lmp)->lp_plt->jb_inst, 243 (ulong_t)aout_rtbndr); 244 245 /* 246 * Loop through relocations. 247 */ 248 for (k = 0; k < nr; k++, rp++) { 249 /* LINTED */ 250 ra = (long *)&((char *)ADDR(lmp))[rp->r_address]; 251 252 /* 253 * Check to see if we're relocating in the text segment 254 * and turn off the write protect if necessary. 255 */ 256 if ((ra < et) && (textrel == 0)) { 257 if (aout_set_prot(lmp, PROT_WRITE) == 0) { 258 ret = 0; 259 break; 260 } 261 textrel = 1; 262 } 263 264 /* 265 * Perform the relocation. 266 */ 267 if (rp->r_extern == 0) { 268 name = (char *)0; 269 value = ADDR(lmp); 270 } else { 271 Slookup sl; 272 uint_t binfo; 273 274 if (rp->r_type == RELOC_JMP_SLOT) 275 continue; 276 sp = &LM2LP(lmp)->lp_symtab[rp->r_symbolnum]; 277 name = &LM2LP(lmp)->lp_symstr[sp->n_un.n_strx]; 278 279 /* 280 * Locate symbol. Initialize the symbol lookup data 281 * structure. 282 */ 283 SLOOKUP_INIT(sl, name, lmp, 0, ld_entry_cnt, 0, 0, 0, 0, 284 LKUP_STDRELOC); 285 286 if ((sym = aout_lookup_sym(&sl, &_lmp, 287 &binfo, in_nfavl)) == 0) { 288 if (lml->lm_flags & LML_FLG_TRC_WARN) { 289 (void) 290 printf(MSG_INTL(MSG_LDD_SYM_NFOUND), 291 demangle(name), NAME(lmp)); 292 continue; 293 } else { 294 eprintf(lml, ERR_FATAL, 295 MSG_INTL(MSG_REL_NOSYM), NAME(lmp), 296 demangle(name)); 297 ret = 0; 298 break; 299 } 300 } 301 302 /* 303 * If symbol was found in an object other than the 304 * referencing object then record the binding. 305 */ 306 if ((lmp != _lmp) && 307 ((FLAGS1(_lmp) & FL1_RT_NOINIFIN) == 0)) { 308 if (aplist_test(&bound, _lmp, 309 AL_CNT_RELBIND) == 0) { 310 ret = 0; 311 break; 312 } 313 } 314 315 value = sym->st_value + rp->r_addend; 316 if (!(FLAGS(_lmp) & FLG_RT_FIXED) && 317 (sym->st_shndx != SHN_COMMON) && 318 (sym->st_shndx != SHN_ABS)) 319 value += ADDR(_lmp); 320 321 if (IS_PC_RELATIVE(rp->r_type)) 322 value -= (long)ADDR(lmp); 323 324 DBG_CALL(Dbg_bind_global(lmp, (Addr)ra, 325 (Off)(ra - ADDR(lmp)), (Xword)(-1), PLT_T_NONE, 326 _lmp, (Addr)value, sym->st_value, name, binfo)); 327 } 328 329 /* 330 * Perform a specific relocation operation. 331 */ 332 switch (rp->r_type) { 333 case RELOC_RELATIVE: 334 value += *ra << (32-22); 335 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 336 ((value >> (32 - 22)) & S_MASK(22)); 337 ra++; 338 value += (*ra & S_MASK(10)); 339 *(long *)ra = (*(long *)ra & ~S_MASK(10)) | 340 (value & S_MASK(10)); 341 break; 342 case RELOC_8: 343 case RELOC_DISP8: 344 value += *ra & S_MASK(8); 345 if (!S_INRANGE(value, 8)) { 346 eprintf(lml, ERR_FATAL, 347 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 348 (name ? demangle(name) : 349 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 8, 350 (uint_t)ra); 351 } 352 *ra = value; 353 break; 354 case RELOC_LO10: 355 case RELOC_BASE10: 356 value += *ra & S_MASK(10); 357 *(long *)ra = (*(long *)ra & ~S_MASK(10)) | 358 (value & S_MASK(10)); 359 break; 360 case RELOC_BASE13: 361 case RELOC_13: 362 value += *ra & S_MASK(13); 363 *(long *)ra = (*(long *)ra & ~S_MASK(13)) | 364 (value & S_MASK(13)); 365 break; 366 case RELOC_16: 367 case RELOC_DISP16: 368 value += *ra & S_MASK(16); 369 if (!S_INRANGE(value, 16)) { 370 eprintf(lml, ERR_FATAL, 371 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 372 (name ? demangle(name) : 373 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 16, 374 (uint_t)ra); 375 } 376 *(short *)ra = value; 377 break; 378 case RELOC_22: 379 case RELOC_BASE22: 380 value += *ra & S_MASK(22); 381 if (!S_INRANGE(value, 22)) { 382 eprintf(lml, ERR_FATAL, 383 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 384 (name ? demangle(name) : 385 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 22, 386 (uint_t)ra); 387 } 388 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 389 (value & S_MASK(22)); 390 break; 391 case RELOC_HI22: 392 value += (*ra & S_MASK(22)) << (32 - 22); 393 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 394 ((value >> (32 - 22)) & S_MASK(22)); 395 break; 396 case RELOC_WDISP22: 397 value += *ra & S_MASK(22); 398 value >>= 2; 399 if (!S_INRANGE(value, 22)) { 400 eprintf(lml, ERR_FATAL, 401 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 402 (name ? demangle(name) : 403 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 22, 404 (uint_t)ra); 405 } 406 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 407 (value & S_MASK(22)); 408 break; 409 case RELOC_WDISP30: 410 value += *ra & S_MASK(30); 411 value >>= 2; 412 *(long *)ra = (*(long *)ra & ~S_MASK(30)) | 413 (value & S_MASK(30)); 414 break; 415 case RELOC_32: 416 case RELOC_GLOB_DAT: 417 case RELOC_DISP32: 418 value += *ra; 419 *(long *)ra = value; 420 break; 421 default: 422 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_REL_UNIMPL), 423 NAME(lmp), (name ? demangle(name) : 424 MSG_INTL(MSG_STR_UNKNOWN)), rp->r_type); 425 ret = 0; 426 break; 427 } 428 429 /* 430 * If this relocation is against a text segment we must make 431 * sure that the instruction cache is flushed. 432 */ 433 if (textrel) { 434 if (rp->r_type == RELOC_RELATIVE) 435 iflush_range((caddr_t)(ra - 1), 0x8); 436 else 437 iflush_range((caddr_t)ra, 0x4); 438 } 439 } 440 441 return (relocate_finish(lmp, bound, textrel, ret)); 442 } 443