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 #include <stdio.h> 28 #include <strings.h> 29 #include <sys/types.h> 30 #include <dlfcn.h> 31 #include <libc_int.h> 32 #include <_rtld.h> 33 #include <_elf.h> 34 #include <msg.h> 35 #include <debug.h> 36 37 #define TLSBLOCKCNT 16 /* number of blocks of tmi_bits to allocate */ 38 /* at a time. */ 39 typedef struct { 40 uint_t *tmi_bits; 41 ulong_t tmi_lowfree; 42 ulong_t tmi_cnt; 43 } Tlsmodid; 44 45 static Tlsmodid tmid = {0, 0, 0}; 46 47 static ulong_t 48 tls_getmodid() 49 { 50 ulong_t ndx, cnt; 51 52 if (tmid.tmi_bits == 0) { 53 if ((tmid.tmi_bits = 54 calloc(TLSBLOCKCNT, sizeof (uint_t))) == NULL) 55 return ((ulong_t)-1); 56 tmid.tmi_bits[0] = 1; 57 tmid.tmi_lowfree = 1; 58 tmid.tmi_cnt = TLSBLOCKCNT; 59 return (0); 60 } 61 62 for (cnt = tmid.tmi_lowfree / (sizeof (uint_t) * 8); 63 cnt < tmid.tmi_cnt; cnt++) { 64 uint_t bits; 65 66 /* 67 * If all bits are assigned - move on. 68 */ 69 if ((tmid.tmi_bits[cnt] ^ ~((uint_t)0)) == 0) 70 continue; 71 72 for (ndx = 0, bits = 1; bits; bits = bits << 1, ndx++) { 73 if ((tmid.tmi_bits[cnt] & bits) == 0) { 74 tmid.tmi_bits[cnt] |= bits; 75 ndx = (cnt * (sizeof (uint_t)) * 8) + ndx; 76 tmid.tmi_lowfree = ndx + 1; 77 return (ndx); 78 } 79 } 80 } 81 82 /* 83 * All bits taken - must allocate a new block 84 */ 85 if ((tmid.tmi_bits = realloc(tmid.tmi_bits, 86 ((tmid.tmi_cnt * sizeof (uint_t)) + 87 (TLSBLOCKCNT * sizeof (uint_t))))) == NULL) 88 return ((ulong_t)-1); 89 90 /* 91 * Clear out the tail of the new allocation. 92 */ 93 bzero(&(tmid.tmi_bits[tmid.tmi_cnt]), TLSBLOCKCNT * sizeof (uint_t)); 94 tmid.tmi_bits[tmid.tmi_cnt] = 1; 95 ndx = (tmid.tmi_cnt * sizeof (uint_t)) * 8; 96 tmid.tmi_lowfree = ndx + 1; 97 tmid.tmi_cnt += TLSBLOCKCNT; 98 99 return (ndx); 100 } 101 102 void 103 tls_freemodid(ulong_t modid) 104 { 105 ulong_t i; 106 uint_t j; 107 108 i = modid / (sizeof (uint_t) * 8); 109 /* LINTED */ 110 j = modid % (sizeof (uint_t) * 8); 111 j = ~(1 << j); 112 tmid.tmi_bits[i] &= j; 113 if (modid < tmid.tmi_lowfree) 114 tmid.tmi_lowfree = modid; 115 } 116 117 void 118 tls_modaddrem(Rt_map *lmp, uint_t flag) 119 { 120 Lm_list *lml = LIST(lmp); 121 TLS_modinfo tmi; 122 Phdr *tlsphdr; 123 int (*fptr)(TLS_modinfo *); 124 125 if (flag & TM_FLG_MODADD) { 126 fptr = lml->lm_lcs[CI_TLS_MODADD].lc_un.lc_func; 127 } else if (FLAGS1(lmp) & FL1_RT_TLSADD) { 128 fptr = lml->lm_lcs[CI_TLS_MODREM].lc_un.lc_func; 129 } else { 130 return; 131 } 132 133 tlsphdr = PTTLS(lmp); 134 135 bzero(&tmi, sizeof (tmi)); 136 tmi.tm_modname = PATHNAME(lmp); 137 tmi.tm_modid = TLSMODID(lmp); 138 tmi.tm_tlsblock = (void *)(tlsphdr->p_vaddr); 139 140 if (!(FLAGS(lmp) & FLG_RT_FIXED)) 141 tmi.tm_tlsblock = (void *)((uintptr_t)tmi.tm_tlsblock + 142 ADDR(lmp)); 143 144 tmi.tm_filesz = tlsphdr->p_filesz; 145 tmi.tm_memsz = tlsphdr->p_memsz; 146 tmi.tm_flags = 0; 147 tmi.tm_stattlsoffset = 0; 148 149 DBG_CALL(Dbg_tls_modactivity(LIST(lmp), &tmi, flag)); 150 (void) (*fptr)(&tmi); 151 152 /* 153 * Tag that this link-map has registered its TLS, and, if this object 154 * is being removed, free up the module id. 155 */ 156 FLAGS1(lmp) |= FL1_RT_TLSADD; 157 158 if (flag & TM_FLG_MODREM) 159 tls_freemodid(TLSMODID(lmp)); 160 } 161 162 static ulong_t tls_static_size = 0; /* static TLS buffer size */ 163 static ulong_t tls_static_resv = 512; /* (extra) static TLS reservation */ 164 165 /* 166 * Track any static TLS use, retain the TLS header, and assign a TLS module 167 * identifier. 168 */ 169 int 170 tls_assign(Lm_list *lml, Rt_map *lmp, Phdr *phdr) 171 { 172 ulong_t memsz = S_ROUND(phdr->p_memsz, M_TLSSTATALIGN); 173 ulong_t filesz = phdr->p_filesz; 174 ulong_t resv = tls_static_resv; 175 176 /* 177 * If this object explicitly references static TLS, then there are some 178 * limitations. 179 */ 180 if (FLAGS1(lmp) & FL1_RT_TLSSTAT) { 181 /* 182 * Static TLS is only available to objects on the primary 183 * link-map list. 184 */ 185 if (((lml->lm_flags & LML_FLG_BASELM) == 0) || 186 ((rtld_flags2 & RT_FL2_NOPLM) != 0)) { 187 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_TLS_STATBASE), 188 NAME(lmp)); 189 return (0); 190 } 191 192 /* 193 * All TLS blocks that are processed before thread 194 * initialization, are registered with libc. This 195 * initialization is carried out through a handshake with libc 196 * prior to executing any user code (ie. before the first .init 197 * sections are called). As part of this initialization, a 198 * small backup TLS reservation is added (tls_static_resv). 199 * Only explicit static TLS references that can be satisfied by 200 * this TLS backup reservation can be satisfied. 201 */ 202 if (rtld_flags2 & RT_FL2_PLMSETUP) { 203 /* 204 * Initialized static TLS can not be satisfied from the 205 * TLS backup reservation. 206 */ 207 if (filesz) { 208 eprintf(lml, ERR_FATAL, 209 MSG_INTL(MSG_TLS_STATINIT), NAME(lmp)); 210 return (0); 211 } 212 213 /* 214 * Make sure the backup reservation is sufficient. 215 */ 216 if (memsz > tls_static_resv) { 217 eprintf(lml, ERR_FATAL, 218 MSG_INTL(MSG_TLS_STATSIZE), NAME(lmp), 219 EC_XWORD(memsz), EC_XWORD(tls_static_resv)); 220 return (0); 221 } 222 223 tls_static_resv -= memsz; 224 } 225 } 226 227 /* 228 * If we haven't yet initialized threads, or this static reservation can 229 * be satisfied from the TLS backup reservation, determine the total 230 * static TLS size, and assign this object a static TLS offset. 231 */ 232 if (((rtld_flags2 & RT_FL2_PLMSETUP) == 0) || 233 (FLAGS1(lmp) & FL1_RT_TLSSTAT)) { 234 tls_static_size += memsz; 235 TLSSTATOFF(lmp) = tls_static_size; 236 } 237 238 /* 239 * Retain the PT_TLS header, obtain a new module identifier, and 240 * indicate that this link-map list contains a new TLS object. 241 */ 242 PTTLS(lmp) = phdr; 243 TLSMODID(lmp) = tls_getmodid(); 244 245 /* 246 * Now that we have a TLS module id, generate any static TLS reservation 247 * diagnostic. 248 */ 249 if (resv != tls_static_resv) 250 DBG_CALL(Dbg_tls_static_resv(lmp, memsz, tls_static_resv)); 251 252 return (++lml->lm_tls); 253 } 254 255 int 256 tls_statmod(Lm_list *lml, Rt_map *lmp) 257 { 258 uint_t tlsmodndx, tlsmodcnt = lml->lm_tls; 259 TLS_modinfo **tlsmodlist, *tlsbuflist; 260 Phdr *tlsphdr; 261 int (*fptr)(TLS_modinfo **, ulong_t); 262 263 fptr = lml->lm_lcs[CI_TLS_STATMOD].lc_un.lc_func; 264 265 /* 266 * Allocate a buffer to report the TLS modules, the buffer consists of: 267 * 268 * TLS_modinfo * ptrs[tlsmodcnt + 1] 269 * TLS_modinfo bufs[tlsmodcnt] 270 * 271 * The ptrs are initialized to the bufs - except the last one which 272 * null terminates the array. 273 * 274 * Note, even if no TLS has yet been observed, we still supply a 275 * TLS buffer with a single null entry. This allows us to initialize 276 * the backup TLS reservation. 277 */ 278 if ((tlsmodlist = calloc((sizeof (TLS_modinfo *) * (tlsmodcnt + 1)) + 279 (sizeof (TLS_modinfo) * tlsmodcnt), 1)) == NULL) 280 return (0); 281 282 lml->lm_tls = 0; 283 284 /* 285 * If we don't have any TLS modules - report that and return. 286 */ 287 if (tlsmodcnt == 0) { 288 if (fptr != NULL) 289 (void) (*fptr)(tlsmodlist, tls_static_resv); 290 DBG_CALL(Dbg_tls_static_block(&lml_main, 0, 0, 291 tls_static_resv)); 292 return (1); 293 } 294 295 /* 296 * Initialize the TLS buffer. 297 */ 298 tlsbuflist = (TLS_modinfo *)((uintptr_t)tlsmodlist + 299 ((tlsmodcnt + 1) * sizeof (TLS_modinfo *))); 300 301 for (tlsmodndx = 0; tlsmodndx < tlsmodcnt; tlsmodndx++) 302 tlsmodlist[tlsmodndx] = &tlsbuflist[tlsmodndx]; 303 304 /* 305 * Account for the initial dtv ptr in the TLSSIZE calculation. 306 */ 307 tlsmodndx = 0; 308 for (lmp = lml->lm_head; lmp; lmp = NEXT_RT_MAP(lmp)) { 309 if (THIS_IS_NOT_ELF(lmp) || 310 (PTTLS(lmp) == 0) || (PTTLS(lmp)->p_memsz == 0)) 311 continue; 312 313 tlsphdr = PTTLS(lmp); 314 315 tlsmodlist[tlsmodndx]->tm_modname = PATHNAME(lmp); 316 tlsmodlist[tlsmodndx]->tm_modid = TLSMODID(lmp); 317 tlsmodlist[tlsmodndx]->tm_tlsblock = (void *)(tlsphdr->p_vaddr); 318 319 if (!(FLAGS(lmp) & FLG_RT_FIXED)) { 320 tlsmodlist[tlsmodndx]->tm_tlsblock = (void *) 321 ((uintptr_t)tlsmodlist[tlsmodndx]->tm_tlsblock + 322 ADDR(lmp)); 323 } 324 tlsmodlist[tlsmodndx]->tm_filesz = tlsphdr->p_filesz; 325 tlsmodlist[tlsmodndx]->tm_memsz = tlsphdr->p_memsz; 326 tlsmodlist[tlsmodndx]->tm_flags = TM_FLG_STATICTLS; 327 tlsmodlist[tlsmodndx]->tm_stattlsoffset = TLSSTATOFF(lmp); 328 tlsmodndx++; 329 } 330 331 DBG_CALL(Dbg_tls_static_block(&lml_main, (void *)tlsmodlist, 332 tls_static_size, tls_static_resv)); 333 (void) (*fptr)(tlsmodlist, (tls_static_size + tls_static_resv)); 334 335 /* 336 * We're done with the list - clean it up. 337 */ 338 free(tlsmodlist); 339 return (1); 340 } 341