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 2009 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 /* 33 * SPARC machine dependent and a.out format file class dependent functions. 34 * Contains routines for performing function binding and symbol relocations. 35 */ 36 37 #include <stdio.h> 38 #include <sys/types.h> 39 #include <sys/mman.h> 40 #include <synch.h> 41 #include <dlfcn.h> 42 #include <debug.h> 43 #include "_a.out.h" 44 #include "_rtld.h" 45 #include "_audit.h" 46 #include "_inline.h" 47 #include "msg.h" 48 49 extern void iflush_range(caddr_t, size_t); 50 51 /* 52 * Function binding routine - invoked on the first call to a function through 53 * the procedure linkage table; 54 * passes first through an assembly language interface. 55 * 56 * Takes the address of the PLT entry where the call originated, 57 * the offset into the relocation table of the associated 58 * relocation entry and the address of the link map (rt_private_map struct) 59 * for the entry. 60 * 61 * Returns the address of the function referenced after re-writing the PLT 62 * entry to invoke the function directly. 63 * 64 * On error, causes process to terminate with a signal. 65 */ 66 ulong_t 67 aout_bndr(caddr_t pc) 68 { 69 Rt_map *lmp, *nlmp, *llmp; 70 struct relocation_info *rp; 71 struct nlist *sp; 72 Sym *sym; 73 char *name; 74 int rndx, entry; 75 ulong_t symval; 76 Slookup sl; 77 uint_t binfo; 78 Lm_list *lml; 79 80 /* 81 * For compatibility with libthread (TI_VERSION 1) we track the entry 82 * value. A zero value indicates we have recursed into ld.so.1 to 83 * further process a locking request (see comments in completion()). 84 * Under this recursion we disable tsort and cleanup activities. 85 */ 86 entry = enter(0); 87 88 for (lmp = lml_main.lm_head; lmp; lmp = NEXT_RT_MAP(lmp)) { 89 if (THIS_IS_AOUT(lmp)) { 90 if (pc > (caddr_t)(LM2LP(lmp)->lp_plt) && 91 pc < (caddr_t)((int)LM2LP(lmp)->lp_plt + 92 AOUTDYN(lmp)->v2->ld_plt_sz)) { 93 break; 94 } 95 } 96 } 97 98 #define LAST22BITS 0x3fffff 99 100 /* LINTED */ 101 rndx = *(int *)(pc + (sizeof (ulong_t *) * 2)) & LAST22BITS; 102 rp = &LM2LP(lmp)->lp_rp[rndx]; 103 sp = &LM2LP(lmp)->lp_symtab[rp->r_symbolnum]; 104 name = &LM2LP(lmp)->lp_symstr[sp->n_un.n_strx]; 105 106 /* 107 * Determine the last link-map of this list, this'll be the starting 108 * point for any tsort() processing. 109 */ 110 lml = LIST(lmp); 111 llmp = lml->lm_tail; 112 113 /* 114 * Find definition for symbol. Initialize the symbol lookup data 115 * structure. 116 */ 117 SLOOKUP_INIT(sl, name, lmp, lml->lm_head, ld_entry_cnt, 0, 0, 0, 0, 118 LKUP_DEFT); 119 120 if ((sym = aout_lookup_sym(&sl, &nlmp, &binfo, NULL)) == 0) { 121 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_REL_NOSYM), NAME(lmp), 122 demangle(name)); 123 rtldexit(lml, 1); 124 } 125 126 symval = sym->st_value; 127 if (!(FLAGS(nlmp) & FLG_RT_FIXED) && 128 (sym->st_shndx != SHN_ABS)) 129 symval += (int)(ADDR(nlmp)); 130 if ((lmp != nlmp) && ((FLAGS1(nlmp) & FL1_RT_NOINIFIN) == 0)) { 131 /* 132 * Record that this new link map is now bound to the caller. 133 */ 134 if (bind_one(lmp, nlmp, BND_REFER) == 0) 135 rtldexit(lml, 1); 136 } 137 138 /* 139 * Print binding information and rebuild PLT entry. 140 */ 141 DBG_CALL(Dbg_bind_global(lmp, (Addr)(ADDR(lmp) + rp->r_address), 142 (Off)rp->r_address, (Xword)(-1), PLT_T_NONE, nlmp, 143 (Addr)symval, sym->st_value, name, binfo)); 144 145 if (!(rtld_flags & RT_FL_NOBIND)) 146 aout_plt_write((caddr_t)(ADDR(lmp) + rp->r_address), symval); 147 148 /* 149 * Complete any processing for newly loaded objects. Note we don't 150 * know exactly where any new objects are loaded (we know the object 151 * that supplied the symbol, but others may have been loaded lazily as 152 * we searched for the symbol), so sorting starts from the last 153 * link-map know on entry to this routine. 154 */ 155 if (entry) 156 load_completion(llmp); 157 158 /* 159 * Make sure the object to which we've bound has had it's .init fired. 160 * Cleanup before return to user code. 161 */ 162 if (entry) { 163 is_dep_init(nlmp, lmp); 164 leave(lml, 0); 165 } 166 167 return (symval); 168 } 169 170 171 #define IS_PC_RELATIVE(X) (pc_rel_type[(X)] == 1) 172 173 static const uchar_t pc_rel_type[] = { 174 0, /* RELOC_8 */ 175 0, /* RELOC_16 */ 176 0, /* RELOC_32 */ 177 1, /* RELOC_DISP8 */ 178 1, /* RELOC_DISP16 */ 179 1, /* RELOC_DISP32 */ 180 1, /* RELOC_WDISP30 */ 181 1, /* RELOC_WDISP22 */ 182 0, /* RELOC_HI22 */ 183 0, /* RELOC_22 */ 184 0, /* RELOC_13 */ 185 0, /* RELOC_LO10 */ 186 0, /* RELOC_SFA_BASE */ 187 0, /* RELOC_SFA_OFF13 */ 188 0, /* RELOC_BASE10 */ 189 0, /* RELOC_BASE13 */ 190 0, /* RELOC_BASE22 */ 191 0, /* RELOC_PC10 */ 192 0, /* RELOC_PC22 */ 193 0, /* RELOC_JMP_TBL */ 194 0, /* RELOC_SEGOFF16 */ 195 0, /* RELOC_GLOB_DAT */ 196 0, /* RELOC_JMP_SLOT */ 197 0 /* RELOC_RELATIVE */ 198 }; 199 200 int 201 aout_reloc(Rt_map *lmp, uint_t plt, int *in_nfavl, APlist **textrel) 202 { 203 int k; /* loop temporary */ 204 int nr; /* number of relocations */ 205 char *name; /* symbol being searched for */ 206 long value; /* relocation temporary */ 207 long *ra; /* cached relocation address */ 208 struct relocation_info *rp; /* current relocation */ 209 struct nlist *sp; /* symbol table of "symbol" */ 210 Rt_map * _lmp; /* lm which holds symbol definition */ 211 Sym * sym; /* symbol definition */ 212 int ret = 1; 213 APlist *bound = NULL; 214 Lm_list *lml = LIST(lmp); 215 216 DBG_CALL(Dbg_reloc_run(lmp, SHT_RELA, plt, DBG_REL_START)); 217 218 /* 219 * If we've been called upon to promote an RTLD_LAZY object to an 220 * RTLD_NOW don't bother to do anything - a.out's are bound as if 221 * RTLD_NOW regardless. 222 */ 223 if (plt) 224 return (1); 225 226 rp = LM2LP(lmp)->lp_rp; 227 nr = GETRELSZ(AOUTDYN(lmp)) / sizeof (struct relocation_info); 228 229 /* 230 * Initialize _PLT_, if any. 231 */ 232 if (AOUTDYN(lmp)->v2->ld_plt_sz) 233 aout_plt_write((caddr_t)LM2LP(lmp)->lp_plt->jb_inst, 234 (ulong_t)aout_rtbndr); 235 236 /* 237 * Loop through relocations. 238 */ 239 for (k = 0; k < nr; k++, rp++) { 240 mmapobj_result_t *mpp; 241 242 /* LINTED */ 243 ra = (long *)&((char *)ADDR(lmp))[rp->r_address]; 244 245 /* 246 * Make sure the segment is writable. 247 */ 248 if (((mpp = find_segment((caddr_t)ra, lmp)) != NULL) && 249 ((mpp->mr_prot & PROT_WRITE) == 0)) { 250 if ((set_prot(lmp, mpp, 1) == 0) || 251 (aplist_append(textrel, mpp, 252 AL_CNT_TEXTREL) == NULL)) { 253 ret = 0; 254 break; 255 } 256 } 257 258 /* 259 * Perform the relocation. 260 */ 261 if (rp->r_extern == 0) { 262 name = (char *)0; 263 value = ADDR(lmp); 264 } else { 265 Slookup sl; 266 uint_t binfo; 267 268 if (rp->r_type == RELOC_JMP_SLOT) 269 continue; 270 sp = &LM2LP(lmp)->lp_symtab[rp->r_symbolnum]; 271 name = &LM2LP(lmp)->lp_symstr[sp->n_un.n_strx]; 272 273 /* 274 * Locate symbol. Initialize the symbol lookup data 275 * structure. 276 */ 277 SLOOKUP_INIT(sl, name, lmp, 0, ld_entry_cnt, 278 0, 0, 0, 0, LKUP_STDRELOC); 279 280 if ((sym = aout_lookup_sym(&sl, &_lmp, 281 &binfo, in_nfavl)) == 0) { 282 if (lml->lm_flags & LML_FLG_TRC_WARN) { 283 (void) 284 printf(MSG_INTL(MSG_LDD_SYM_NFOUND), 285 demangle(name), NAME(lmp)); 286 continue; 287 } else { 288 eprintf(lml, ERR_FATAL, 289 MSG_INTL(MSG_REL_NOSYM), NAME(lmp), 290 demangle(name)); 291 ret = 0; 292 break; 293 } 294 } 295 296 /* 297 * If symbol was found in an object other than the 298 * referencing object then record the binding. 299 */ 300 if ((lmp != _lmp) && 301 ((FLAGS1(_lmp) & FL1_RT_NOINIFIN) == 0)) { 302 if (aplist_test(&bound, _lmp, 303 AL_CNT_RELBIND) == 0) { 304 ret = 0; 305 break; 306 } 307 } 308 309 value = sym->st_value + rp->r_addend; 310 if (!(FLAGS(_lmp) & FLG_RT_FIXED) && 311 (sym->st_shndx != SHN_COMMON) && 312 (sym->st_shndx != SHN_ABS)) 313 value += ADDR(_lmp); 314 315 if (IS_PC_RELATIVE(rp->r_type)) 316 value -= (long)ADDR(lmp); 317 318 DBG_CALL(Dbg_bind_global(lmp, (Addr)ra, 319 (Off)(ra - ADDR(lmp)), (Xword)(-1), PLT_T_NONE, 320 _lmp, (Addr)value, sym->st_value, name, binfo)); 321 } 322 323 /* 324 * Perform a specific relocation operation. 325 */ 326 switch (rp->r_type) { 327 case RELOC_RELATIVE: 328 value += *ra << (32-22); 329 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 330 ((value >> (32 - 22)) & S_MASK(22)); 331 ra++; 332 value += (*ra & S_MASK(10)); 333 *(long *)ra = (*(long *)ra & ~S_MASK(10)) | 334 (value & S_MASK(10)); 335 break; 336 case RELOC_8: 337 case RELOC_DISP8: 338 value += *ra & S_MASK(8); 339 if (!S_INRANGE(value, 8)) { 340 eprintf(lml, ERR_FATAL, 341 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 342 (name ? demangle(name) : 343 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 8, 344 (uint_t)ra); 345 } 346 *ra = value; 347 break; 348 case RELOC_LO10: 349 case RELOC_BASE10: 350 value += *ra & S_MASK(10); 351 *(long *)ra = (*(long *)ra & ~S_MASK(10)) | 352 (value & S_MASK(10)); 353 break; 354 case RELOC_BASE13: 355 case RELOC_13: 356 value += *ra & S_MASK(13); 357 *(long *)ra = (*(long *)ra & ~S_MASK(13)) | 358 (value & S_MASK(13)); 359 break; 360 case RELOC_16: 361 case RELOC_DISP16: 362 value += *ra & S_MASK(16); 363 if (!S_INRANGE(value, 16)) { 364 eprintf(lml, ERR_FATAL, 365 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 366 (name ? demangle(name) : 367 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 16, 368 (uint_t)ra); 369 } 370 *(short *)ra = value; 371 break; 372 case RELOC_22: 373 case RELOC_BASE22: 374 value += *ra & S_MASK(22); 375 if (!S_INRANGE(value, 22)) { 376 eprintf(lml, ERR_FATAL, 377 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 378 (name ? demangle(name) : 379 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 22, 380 (uint_t)ra); 381 } 382 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 383 (value & S_MASK(22)); 384 break; 385 case RELOC_HI22: 386 value += (*ra & S_MASK(22)) << (32 - 22); 387 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 388 ((value >> (32 - 22)) & S_MASK(22)); 389 break; 390 case RELOC_WDISP22: 391 value += *ra & S_MASK(22); 392 value >>= 2; 393 if (!S_INRANGE(value, 22)) { 394 eprintf(lml, ERR_FATAL, 395 MSG_INTL(MSG_REL_OVERFLOW), NAME(lmp), 396 (name ? demangle(name) : 397 MSG_INTL(MSG_STR_UNKNOWN)), (int)value, 22, 398 (uint_t)ra); 399 } 400 *(long *)ra = (*(long *)ra & ~S_MASK(22)) | 401 (value & S_MASK(22)); 402 break; 403 case RELOC_WDISP30: 404 value += *ra & S_MASK(30); 405 value >>= 2; 406 *(long *)ra = (*(long *)ra & ~S_MASK(30)) | 407 (value & S_MASK(30)); 408 break; 409 case RELOC_32: 410 case RELOC_GLOB_DAT: 411 case RELOC_DISP32: 412 value += *ra; 413 *(long *)ra = value; 414 break; 415 default: 416 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_REL_UNIMPL), 417 NAME(lmp), (name ? demangle(name) : 418 MSG_INTL(MSG_STR_UNKNOWN)), rp->r_type); 419 ret = 0; 420 break; 421 } 422 423 /* 424 * If this relocation is against a text segment we must make 425 * sure that the instruction cache is flushed. 426 */ 427 if (textrel) { 428 if (rp->r_type == RELOC_RELATIVE) 429 iflush_range((caddr_t)(ra - 1), 0x8); 430 else 431 iflush_range((caddr_t)ra, 0x4); 432 } 433 } 434 435 return (relocate_finish(lmp, bound, ret)); 436 } 437