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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/sysmacros.h> 31 32 #include <strings.h> 33 #include <alloca.h> 34 #include <assert.h> 35 #include <stdlib.h> 36 #include <errno.h> 37 #include <limits.h> 38 39 #include <dt_impl.h> 40 #include <dt_strtab.h> 41 #include <dt_program.h> 42 #include <dt_provider.h> 43 #include <dt_xlator.h> 44 #include <dt_dof.h> 45 46 void 47 dt_dof_init(dtrace_hdl_t *dtp) 48 { 49 dt_dof_t *ddo = &dtp->dt_dof; 50 51 ddo->ddo_hdl = dtp; 52 ddo->ddo_nsecs = 0; 53 ddo->ddo_strsec = DOF_SECIDX_NONE; 54 ddo->ddo_xlimport = NULL; 55 ddo->ddo_xlexport = NULL; 56 57 dt_buf_create(dtp, &ddo->ddo_secs, "section headers", 0); 58 dt_buf_create(dtp, &ddo->ddo_strs, "string table", 0); 59 dt_buf_create(dtp, &ddo->ddo_ldata, "loadable data", 0); 60 dt_buf_create(dtp, &ddo->ddo_udata, "unloadable data", 0); 61 62 dt_buf_create(dtp, &ddo->ddo_probes, "probe data", 0); 63 dt_buf_create(dtp, &ddo->ddo_args, "probe args", 0); 64 dt_buf_create(dtp, &ddo->ddo_offs, "probe offs", 0); 65 dt_buf_create(dtp, &ddo->ddo_enoffs, "probe is-enabled offs", 0); 66 dt_buf_create(dtp, &ddo->ddo_rels, "probe rels", 0); 67 68 dt_buf_create(dtp, &ddo->ddo_xlms, "xlate members", 0); 69 } 70 71 void 72 dt_dof_fini(dtrace_hdl_t *dtp) 73 { 74 dt_dof_t *ddo = &dtp->dt_dof; 75 76 dt_free(dtp, ddo->ddo_xlimport); 77 dt_free(dtp, ddo->ddo_xlexport); 78 79 dt_buf_destroy(dtp, &ddo->ddo_secs); 80 dt_buf_destroy(dtp, &ddo->ddo_strs); 81 dt_buf_destroy(dtp, &ddo->ddo_ldata); 82 dt_buf_destroy(dtp, &ddo->ddo_udata); 83 84 dt_buf_destroy(dtp, &ddo->ddo_probes); 85 dt_buf_destroy(dtp, &ddo->ddo_args); 86 dt_buf_destroy(dtp, &ddo->ddo_offs); 87 dt_buf_destroy(dtp, &ddo->ddo_enoffs); 88 dt_buf_destroy(dtp, &ddo->ddo_rels); 89 90 dt_buf_destroy(dtp, &ddo->ddo_xlms); 91 } 92 93 static int 94 dt_dof_reset(dtrace_hdl_t *dtp, dtrace_prog_t *pgp) 95 { 96 dt_dof_t *ddo = &dtp->dt_dof; 97 uint_t i, nx = dtp->dt_xlatorid; 98 99 assert(ddo->ddo_hdl == dtp); 100 ddo->ddo_pgp = pgp; 101 102 ddo->ddo_nsecs = 0; 103 ddo->ddo_strsec = DOF_SECIDX_NONE; 104 105 dt_free(dtp, ddo->ddo_xlimport); 106 dt_free(dtp, ddo->ddo_xlexport); 107 108 ddo->ddo_xlimport = dt_alloc(dtp, sizeof (dof_secidx_t) * nx); 109 ddo->ddo_xlexport = dt_alloc(dtp, sizeof (dof_secidx_t) * nx); 110 111 if (nx != 0 && (ddo->ddo_xlimport == NULL || ddo->ddo_xlexport == NULL)) 112 return (-1); /* errno is set for us */ 113 114 for (i = 0; i < nx; i++) { 115 ddo->ddo_xlimport[i] = DOF_SECIDX_NONE; 116 ddo->ddo_xlexport[i] = DOF_SECIDX_NONE; 117 } 118 119 dt_buf_reset(dtp, &ddo->ddo_secs); 120 dt_buf_reset(dtp, &ddo->ddo_strs); 121 dt_buf_reset(dtp, &ddo->ddo_ldata); 122 dt_buf_reset(dtp, &ddo->ddo_udata); 123 124 dt_buf_reset(dtp, &ddo->ddo_probes); 125 dt_buf_reset(dtp, &ddo->ddo_args); 126 dt_buf_reset(dtp, &ddo->ddo_offs); 127 dt_buf_reset(dtp, &ddo->ddo_enoffs); 128 dt_buf_reset(dtp, &ddo->ddo_rels); 129 130 dt_buf_reset(dtp, &ddo->ddo_xlms); 131 return (0); 132 } 133 134 /* 135 * Add a loadable DOF section to the file using the specified data buffer and 136 * the specified DOF section attributes. DOF_SECF_LOAD must be set in flags. 137 * If 'data' is NULL, the caller is responsible for manipulating the ldata buf. 138 */ 139 static dof_secidx_t 140 dof_add_lsect(dt_dof_t *ddo, const void *data, uint32_t type, 141 uint32_t align, uint32_t flags, uint32_t entsize, uint64_t size) 142 { 143 dtrace_hdl_t *dtp = ddo->ddo_hdl; 144 dof_sec_t s; 145 146 s.dofs_type = type; 147 s.dofs_align = align; 148 s.dofs_flags = flags | DOF_SECF_LOAD; 149 s.dofs_entsize = entsize; 150 s.dofs_offset = dt_buf_offset(&ddo->ddo_ldata, align); 151 s.dofs_size = size; 152 153 dt_buf_write(dtp, &ddo->ddo_secs, &s, sizeof (s), sizeof (uint64_t)); 154 155 if (data != NULL) 156 dt_buf_write(dtp, &ddo->ddo_ldata, data, size, align); 157 158 return (ddo->ddo_nsecs++); 159 } 160 161 /* 162 * Add an unloadable DOF section to the file using the specified data buffer 163 * and DOF section attributes. DOF_SECF_LOAD must *not* be set in flags. 164 * If 'data' is NULL, the caller is responsible for manipulating the udata buf. 165 */ 166 static dof_secidx_t 167 dof_add_usect(dt_dof_t *ddo, const void *data, uint32_t type, 168 uint32_t align, uint32_t flags, uint32_t entsize, uint64_t size) 169 { 170 dtrace_hdl_t *dtp = ddo->ddo_hdl; 171 dof_sec_t s; 172 173 s.dofs_type = type; 174 s.dofs_align = align; 175 s.dofs_flags = flags & ~DOF_SECF_LOAD; 176 s.dofs_entsize = entsize; 177 s.dofs_offset = dt_buf_offset(&ddo->ddo_udata, align); 178 s.dofs_size = size; 179 180 dt_buf_write(dtp, &ddo->ddo_secs, &s, sizeof (s), sizeof (uint64_t)); 181 182 if (data != NULL) 183 dt_buf_write(dtp, &ddo->ddo_udata, data, size, align); 184 185 return (ddo->ddo_nsecs++); 186 } 187 188 /* 189 * Add a string to the global string table associated with the DOF. The offset 190 * of the string is returned as an index into the string table. 191 */ 192 static dof_stridx_t 193 dof_add_string(dt_dof_t *ddo, const char *s) 194 { 195 dt_buf_t *bp = &ddo->ddo_strs; 196 dof_stridx_t i = dt_buf_len(bp); 197 198 if (i != 0 && (s == NULL || *s == '\0')) 199 return (0); /* string table has \0 at offset 0 */ 200 201 dt_buf_write(ddo->ddo_hdl, bp, s, strlen(s) + 1, sizeof (char)); 202 return (i); 203 } 204 205 static dof_attr_t 206 dof_attr(const dtrace_attribute_t *ap) 207 { 208 return (DOF_ATTR(ap->dtat_name, ap->dtat_data, ap->dtat_class)); 209 } 210 211 static dof_secidx_t 212 dof_add_difo(dt_dof_t *ddo, const dtrace_difo_t *dp) 213 { 214 dof_secidx_t dsecs[5]; /* enough for all possible DIFO sections */ 215 uint_t nsecs = 0; 216 217 dof_difohdr_t *dofd; 218 dof_relohdr_t dofr; 219 dof_secidx_t relsec; 220 221 dof_secidx_t strsec = DOF_SECIDX_NONE; 222 dof_secidx_t intsec = DOF_SECIDX_NONE; 223 dof_secidx_t hdrsec = DOF_SECIDX_NONE; 224 225 if (dp->dtdo_buf != NULL) { 226 dsecs[nsecs++] = dof_add_lsect(ddo, dp->dtdo_buf, 227 DOF_SECT_DIF, sizeof (dif_instr_t), 0, 228 sizeof (dif_instr_t), sizeof (dif_instr_t) * dp->dtdo_len); 229 } 230 231 if (dp->dtdo_inttab != NULL) { 232 dsecs[nsecs++] = intsec = dof_add_lsect(ddo, dp->dtdo_inttab, 233 DOF_SECT_INTTAB, sizeof (uint64_t), 0, 234 sizeof (uint64_t), sizeof (uint64_t) * dp->dtdo_intlen); 235 } 236 237 if (dp->dtdo_strtab != NULL) { 238 dsecs[nsecs++] = strsec = dof_add_lsect(ddo, dp->dtdo_strtab, 239 DOF_SECT_STRTAB, sizeof (char), 0, 0, dp->dtdo_strlen); 240 } 241 242 if (dp->dtdo_vartab != NULL) { 243 dsecs[nsecs++] = dof_add_lsect(ddo, dp->dtdo_vartab, 244 DOF_SECT_VARTAB, sizeof (uint_t), 0, sizeof (dtrace_difv_t), 245 sizeof (dtrace_difv_t) * dp->dtdo_varlen); 246 } 247 248 if (dp->dtdo_xlmtab != NULL) { 249 dof_xlref_t *xlt, *xlp; 250 dt_node_t **pnp; 251 252 xlt = alloca(sizeof (dof_xlref_t) * dp->dtdo_xlmlen); 253 pnp = dp->dtdo_xlmtab; 254 255 /* 256 * dtdo_xlmtab contains pointers to the translator members. 257 * The translator itself is in sect ddo_xlimport[dxp->dx_id]. 258 * The XLMEMBERS entries are in order by their dn_membid, so 259 * the member section offset is the population count of bits 260 * in ddo_pgp->dp_xlrefs[] up to and not including dn_membid. 261 */ 262 for (xlp = xlt; xlp < xlt + dp->dtdo_xlmlen; xlp++) { 263 dt_node_t *dnp = *pnp++; 264 dt_xlator_t *dxp = dnp->dn_membexpr->dn_xlator; 265 266 xlp->dofxr_xlator = ddo->ddo_xlimport[dxp->dx_id]; 267 xlp->dofxr_member = dt_popcb( 268 ddo->ddo_pgp->dp_xrefs[dxp->dx_id], dnp->dn_membid); 269 xlp->dofxr_argn = (uint32_t)dxp->dx_arg; 270 } 271 272 dsecs[nsecs++] = dof_add_lsect(ddo, xlt, DOF_SECT_XLTAB, 273 sizeof (dof_secidx_t), 0, sizeof (dof_xlref_t), 274 sizeof (dof_xlref_t) * dp->dtdo_xlmlen); 275 } 276 277 /* 278 * Copy the return type and the array of section indices that form the 279 * DIFO into a single dof_difohdr_t and then add DOF_SECT_DIFOHDR. 280 */ 281 assert(nsecs <= sizeof (dsecs) / sizeof (dsecs[0])); 282 dofd = alloca(sizeof (dtrace_diftype_t) + sizeof (dsecs)); 283 bcopy(&dp->dtdo_rtype, &dofd->dofd_rtype, sizeof (dtrace_diftype_t)); 284 bcopy(dsecs, &dofd->dofd_links, sizeof (dof_secidx_t) * nsecs); 285 286 hdrsec = dof_add_lsect(ddo, dofd, DOF_SECT_DIFOHDR, 287 sizeof (dof_secidx_t), 0, 0, 288 sizeof (dtrace_diftype_t) + sizeof (dof_secidx_t) * nsecs); 289 290 /* 291 * Add any other sections related to dtrace_difo_t. These are not 292 * referenced in dof_difohdr_t because they are not used by emulation. 293 */ 294 if (dp->dtdo_kreltab != NULL) { 295 relsec = dof_add_lsect(ddo, dp->dtdo_kreltab, DOF_SECT_RELTAB, 296 sizeof (uint64_t), 0, sizeof (dof_relodesc_t), 297 sizeof (dof_relodesc_t) * dp->dtdo_krelen); 298 299 /* 300 * This code assumes the target of all relocations is the 301 * integer table 'intsec' (DOF_SECT_INTTAB). If other sections 302 * need relocation in the future this will need to change. 303 */ 304 dofr.dofr_strtab = strsec; 305 dofr.dofr_relsec = relsec; 306 dofr.dofr_tgtsec = intsec; 307 308 (void) dof_add_lsect(ddo, &dofr, DOF_SECT_KRELHDR, 309 sizeof (dof_secidx_t), 0, 0, sizeof (dof_relohdr_t)); 310 } 311 312 if (dp->dtdo_ureltab != NULL) { 313 relsec = dof_add_lsect(ddo, dp->dtdo_ureltab, DOF_SECT_RELTAB, 314 sizeof (uint64_t), 0, sizeof (dof_relodesc_t), 315 sizeof (dof_relodesc_t) * dp->dtdo_urelen); 316 317 /* 318 * This code assumes the target of all relocations is the 319 * integer table 'intsec' (DOF_SECT_INTTAB). If other sections 320 * need relocation in the future this will need to change. 321 */ 322 dofr.dofr_strtab = strsec; 323 dofr.dofr_relsec = relsec; 324 dofr.dofr_tgtsec = intsec; 325 326 (void) dof_add_lsect(ddo, &dofr, DOF_SECT_URELHDR, 327 sizeof (dof_secidx_t), 0, 0, sizeof (dof_relohdr_t)); 328 } 329 330 return (hdrsec); 331 } 332 333 static void 334 dof_add_translator(dt_dof_t *ddo, const dt_xlator_t *dxp, uint_t type) 335 { 336 dtrace_hdl_t *dtp = ddo->ddo_hdl; 337 dof_xlmember_t dofxm; 338 dof_xlator_t dofxl; 339 dof_secidx_t *xst; 340 341 char buf[DT_TYPE_NAMELEN]; 342 dt_node_t *dnp; 343 uint_t i = 0; 344 345 assert(type == DOF_SECT_XLIMPORT || type == DOF_SECT_XLEXPORT); 346 xst = type == DOF_SECT_XLIMPORT ? ddo->ddo_xlimport : ddo->ddo_xlexport; 347 348 if (xst[dxp->dx_id] != DOF_SECIDX_NONE) 349 return; /* translator has already been emitted */ 350 351 dt_buf_reset(dtp, &ddo->ddo_xlms); 352 353 /* 354 * Generate an array of dof_xlmember_t's into ddo_xlms. If we are 355 * importing the translator, add only those members referenced by the 356 * program and set the dofxm_difo reference of each member to NONE. If 357 * we're exporting the translator, add all members and a DIFO for each. 358 */ 359 for (dnp = dxp->dx_members; dnp != NULL; dnp = dnp->dn_list, i++) { 360 if (type == DOF_SECT_XLIMPORT) { 361 if (!BT_TEST(ddo->ddo_pgp->dp_xrefs[dxp->dx_id], i)) 362 continue; /* member is not referenced */ 363 dofxm.dofxm_difo = DOF_SECIDX_NONE; 364 } else { 365 dofxm.dofxm_difo = dof_add_difo(ddo, 366 dxp->dx_membdif[dnp->dn_membid]); 367 } 368 369 dofxm.dofxm_name = dof_add_string(ddo, dnp->dn_membname); 370 dt_node_diftype(dtp, dnp, &dofxm.dofxm_type); 371 372 dt_buf_write(dtp, &ddo->ddo_xlms, 373 &dofxm, sizeof (dofxm), sizeof (uint32_t)); 374 } 375 376 dofxl.dofxl_members = dof_add_lsect(ddo, NULL, DOF_SECT_XLMEMBERS, 377 sizeof (uint32_t), 0, sizeof (dofxm), dt_buf_len(&ddo->ddo_xlms)); 378 379 dt_buf_concat(dtp, &ddo->ddo_ldata, &ddo->ddo_xlms, sizeof (uint32_t)); 380 381 dofxl.dofxl_strtab = ddo->ddo_strsec; 382 dofxl.dofxl_argv = dof_add_string(ddo, ctf_type_name( 383 dxp->dx_src_ctfp, dxp->dx_src_type, buf, sizeof (buf))); 384 dofxl.dofxl_argc = 1; 385 dofxl.dofxl_type = dof_add_string(ddo, ctf_type_name( 386 dxp->dx_dst_ctfp, dxp->dx_dst_type, buf, sizeof (buf))); 387 dofxl.dofxl_attr = dof_attr(&dxp->dx_souid.di_attr); 388 389 xst[dxp->dx_id] = dof_add_lsect(ddo, &dofxl, type, 390 sizeof (uint32_t), 0, 0, sizeof (dofxl)); 391 } 392 393 /*ARGSUSED*/ 394 static int 395 dof_add_probe(dt_idhash_t *dhp, dt_ident_t *idp, void *data) 396 { 397 dt_dof_t *ddo = data; 398 dtrace_hdl_t *dtp = ddo->ddo_hdl; 399 dt_probe_t *prp = idp->di_data; 400 401 dof_probe_t dofpr; 402 dof_relodesc_t dofr; 403 dt_probe_instance_t *pip; 404 dt_node_t *dnp; 405 406 char buf[DT_TYPE_NAMELEN]; 407 uint_t i; 408 409 dofpr.dofpr_addr = 0; 410 dofpr.dofpr_name = dof_add_string(ddo, prp->pr_name); 411 dofpr.dofpr_nargv = dt_buf_len(&ddo->ddo_strs); 412 413 for (dnp = prp->pr_nargs; dnp != NULL; dnp = dnp->dn_list) { 414 (void) dof_add_string(ddo, ctf_type_name(dnp->dn_ctfp, 415 dnp->dn_type, buf, sizeof (buf))); 416 } 417 418 dofpr.dofpr_xargv = dt_buf_len(&ddo->ddo_strs); 419 420 for (dnp = prp->pr_xargs; dnp != NULL; dnp = dnp->dn_list) { 421 (void) dof_add_string(ddo, ctf_type_name(dnp->dn_ctfp, 422 dnp->dn_type, buf, sizeof (buf))); 423 } 424 425 dofpr.dofpr_argidx = dt_buf_len(&ddo->ddo_args) / sizeof (uint8_t); 426 427 for (i = 0; i < prp->pr_xargc; i++) { 428 dt_buf_write(dtp, &ddo->ddo_args, &prp->pr_mapping[i], 429 sizeof (uint8_t), sizeof (uint8_t)); 430 } 431 432 dofpr.dofpr_nargc = prp->pr_nargc; 433 dofpr.dofpr_xargc = prp->pr_xargc; 434 dofpr.dofpr_pad1 = 0; 435 dofpr.dofpr_pad2 = 0; 436 437 for (pip = prp->pr_inst; pip != NULL; pip = pip->pi_next) { 438 dt_dprintf("adding probe for %s:%s\n", pip->pi_fname, 439 prp->pr_name); 440 441 dofpr.dofpr_func = dof_add_string(ddo, pip->pi_fname); 442 443 /* 444 * There should be one probe offset or is-enabled probe offset 445 * or else this probe instance won't have been created. The 446 * kernel will reject DOF which has a probe with no offsets. 447 */ 448 assert(pip->pi_noffs + pip->pi_nenoffs > 0); 449 450 dofpr.dofpr_offidx = 451 dt_buf_len(&ddo->ddo_offs) / sizeof (uint32_t); 452 dofpr.dofpr_noffs = pip->pi_noffs; 453 dt_buf_write(dtp, &ddo->ddo_offs, pip->pi_offs, 454 pip->pi_noffs * sizeof (uint32_t), sizeof (uint32_t)); 455 456 dofpr.dofpr_enoffidx = 457 dt_buf_len(&ddo->ddo_enoffs) / sizeof (uint32_t); 458 dofpr.dofpr_nenoffs = pip->pi_nenoffs; 459 dt_buf_write(dtp, &ddo->ddo_enoffs, pip->pi_enoffs, 460 pip->pi_nenoffs * sizeof (uint32_t), sizeof (uint32_t)); 461 462 /* 463 * If pi_rname isn't set, the relocation will be against the 464 * function name. If it is, the relocation will be against 465 * pi_rname. This will be used if the function is scoped 466 * locally so an alternate symbol is added for the purpose 467 * of this relocation. 468 */ 469 if (pip->pi_rname[0] == '\0') 470 dofr.dofr_name = dofpr.dofpr_func; 471 else 472 dofr.dofr_name = dof_add_string(ddo, pip->pi_rname); 473 dofr.dofr_type = DOF_RELO_SETX; 474 dofr.dofr_offset = dt_buf_len(&ddo->ddo_probes); 475 dofr.dofr_data = 0; 476 477 dt_buf_write(dtp, &ddo->ddo_rels, &dofr, 478 sizeof (dofr), sizeof (uint64_t)); 479 480 dt_buf_write(dtp, &ddo->ddo_probes, &dofpr, 481 sizeof (dofpr), sizeof (uint64_t)); 482 } 483 484 return (0); 485 } 486 487 static void 488 dof_add_provider(dt_dof_t *ddo, const dt_provider_t *pvp) 489 { 490 dtrace_hdl_t *dtp = ddo->ddo_hdl; 491 dof_provider_t dofpv; 492 dof_relohdr_t dofr; 493 dof_secidx_t *dofs; 494 ulong_t xr, nxr; 495 size_t sz; 496 id_t i; 497 498 if (pvp->pv_flags & DT_PROVIDER_IMPL) 499 return; /* ignore providers that are exported by dtrace(7D) */ 500 501 nxr = dt_popcb(pvp->pv_xrefs, pvp->pv_xrmax); 502 dofs = alloca(sizeof (dof_secidx_t) * (nxr + 1)); 503 xr = 1; /* reserve dofs[0] for the provider itself */ 504 505 /* 506 * For each translator referenced by the provider (pv_xrefs), emit an 507 * exported translator section for it if one hasn't been created yet. 508 */ 509 for (i = 0; i < pvp->pv_xrmax; i++) { 510 if (BT_TEST(pvp->pv_xrefs, i) && 511 dtp->dt_xlatemode == DT_XL_DYNAMIC) { 512 dof_add_translator(ddo, 513 dt_xlator_lookup_id(dtp, i), DOF_SECT_XLEXPORT); 514 dofs[xr++] = ddo->ddo_xlexport[i]; 515 } 516 } 517 518 dt_buf_reset(dtp, &ddo->ddo_probes); 519 dt_buf_reset(dtp, &ddo->ddo_args); 520 dt_buf_reset(dtp, &ddo->ddo_offs); 521 dt_buf_reset(dtp, &ddo->ddo_enoffs); 522 dt_buf_reset(dtp, &ddo->ddo_rels); 523 524 (void) dt_idhash_iter(pvp->pv_probes, dof_add_probe, ddo); 525 526 dofpv.dofpv_probes = dof_add_lsect(ddo, NULL, DOF_SECT_PROBES, 527 sizeof (uint64_t), 0, sizeof (dof_probe_t), 528 dt_buf_len(&ddo->ddo_probes)); 529 530 dt_buf_concat(dtp, &ddo->ddo_ldata, 531 &ddo->ddo_probes, sizeof (uint64_t)); 532 533 dofpv.dofpv_prargs = dof_add_lsect(ddo, NULL, DOF_SECT_PRARGS, 534 sizeof (uint8_t), 0, sizeof (uint8_t), dt_buf_len(&ddo->ddo_args)); 535 536 dt_buf_concat(dtp, &ddo->ddo_ldata, &ddo->ddo_args, sizeof (uint8_t)); 537 538 dofpv.dofpv_proffs = dof_add_lsect(ddo, NULL, DOF_SECT_PROFFS, 539 sizeof (uint_t), 0, sizeof (uint_t), dt_buf_len(&ddo->ddo_offs)); 540 541 dt_buf_concat(dtp, &ddo->ddo_ldata, &ddo->ddo_offs, sizeof (uint_t)); 542 543 if ((sz = dt_buf_len(&ddo->ddo_enoffs)) != 0) { 544 dofpv.dofpv_prenoffs = dof_add_lsect(ddo, NULL, 545 DOF_SECT_PRENOFFS, sizeof (uint_t), 0, sizeof (uint_t), sz); 546 } else { 547 dofpv.dofpv_prenoffs = DOF_SECT_NONE; 548 } 549 550 dt_buf_concat(dtp, &ddo->ddo_ldata, &ddo->ddo_enoffs, sizeof (uint_t)); 551 552 dofpv.dofpv_strtab = ddo->ddo_strsec; 553 dofpv.dofpv_name = dof_add_string(ddo, pvp->pv_desc.dtvd_name); 554 555 dofpv.dofpv_provattr = dof_attr(&pvp->pv_desc.dtvd_attr.dtpa_provider); 556 dofpv.dofpv_modattr = dof_attr(&pvp->pv_desc.dtvd_attr.dtpa_mod); 557 dofpv.dofpv_funcattr = dof_attr(&pvp->pv_desc.dtvd_attr.dtpa_func); 558 dofpv.dofpv_nameattr = dof_attr(&pvp->pv_desc.dtvd_attr.dtpa_name); 559 dofpv.dofpv_argsattr = dof_attr(&pvp->pv_desc.dtvd_attr.dtpa_args); 560 561 dofs[0] = dof_add_lsect(ddo, &dofpv, DOF_SECT_PROVIDER, 562 sizeof (dof_secidx_t), 0, 0, sizeof (dof_provider_t)); 563 564 dofr.dofr_strtab = dofpv.dofpv_strtab; 565 dofr.dofr_tgtsec = dofpv.dofpv_probes; 566 dofr.dofr_relsec = dof_add_lsect(ddo, NULL, DOF_SECT_RELTAB, 567 sizeof (uint64_t), 0, sizeof (dof_relodesc_t), 568 dt_buf_len(&ddo->ddo_rels)); 569 570 dt_buf_concat(dtp, &ddo->ddo_ldata, &ddo->ddo_rels, sizeof (uint64_t)); 571 572 (void) dof_add_lsect(ddo, &dofr, DOF_SECT_URELHDR, 573 sizeof (dof_secidx_t), 0, 0, sizeof (dof_relohdr_t)); 574 575 if (nxr != 0 && dtp->dt_xlatemode == DT_XL_DYNAMIC) { 576 (void) dof_add_lsect(ddo, dofs, DOF_SECT_PREXPORT, 577 sizeof (dof_secidx_t), 0, sizeof (dof_secidx_t), 578 sizeof (dof_secidx_t) * (nxr + 1)); 579 } 580 } 581 582 static int 583 dof_hdr(dtrace_hdl_t *dtp, uint8_t dofversion, dof_hdr_t *hp) 584 { 585 /* 586 * If our config values cannot fit in a uint8_t, we can't generate a 587 * DOF header since the values won't fit. This can only happen if the 588 * user forcibly compiles a program with an artificial configuration. 589 */ 590 if (dtp->dt_conf.dtc_difversion > UINT8_MAX || 591 dtp->dt_conf.dtc_difintregs > UINT8_MAX || 592 dtp->dt_conf.dtc_diftupregs > UINT8_MAX) 593 return (dt_set_errno(dtp, EOVERFLOW)); 594 595 bzero(hp, sizeof (dof_hdr_t)); 596 597 hp->dofh_ident[DOF_ID_MAG0] = DOF_MAG_MAG0; 598 hp->dofh_ident[DOF_ID_MAG1] = DOF_MAG_MAG1; 599 hp->dofh_ident[DOF_ID_MAG2] = DOF_MAG_MAG2; 600 hp->dofh_ident[DOF_ID_MAG3] = DOF_MAG_MAG3; 601 602 if (dtp->dt_conf.dtc_ctfmodel == CTF_MODEL_LP64) 603 hp->dofh_ident[DOF_ID_MODEL] = DOF_MODEL_LP64; 604 else 605 hp->dofh_ident[DOF_ID_MODEL] = DOF_MODEL_ILP32; 606 607 hp->dofh_ident[DOF_ID_ENCODING] = DOF_ENCODE_NATIVE; 608 hp->dofh_ident[DOF_ID_VERSION] = dofversion; 609 hp->dofh_ident[DOF_ID_DIFVERS] = dtp->dt_conf.dtc_difversion; 610 hp->dofh_ident[DOF_ID_DIFIREG] = dtp->dt_conf.dtc_difintregs; 611 hp->dofh_ident[DOF_ID_DIFTREG] = dtp->dt_conf.dtc_diftupregs; 612 613 hp->dofh_hdrsize = sizeof (dof_hdr_t); 614 hp->dofh_secsize = sizeof (dof_sec_t); 615 hp->dofh_secoff = sizeof (dof_hdr_t); 616 617 return (0); 618 } 619 620 void * 621 dtrace_dof_create(dtrace_hdl_t *dtp, dtrace_prog_t *pgp, uint_t flags) 622 { 623 dt_dof_t *ddo = &dtp->dt_dof; 624 625 const dtrace_ecbdesc_t *edp, *last; 626 const dtrace_probedesc_t *pdp; 627 const dtrace_actdesc_t *ap; 628 const dt_stmt_t *stp; 629 630 uint_t maxacts = 0; 631 uint_t maxfmt = 0; 632 633 dt_provider_t *pvp; 634 dt_xlator_t *dxp; 635 dof_actdesc_t *dofa; 636 dof_sec_t *sp; 637 size_t ssize, lsize; 638 dof_hdr_t h; 639 640 dt_buf_t dof; 641 char *fmt; 642 uint_t i; 643 644 if (flags & ~DTRACE_D_MASK) { 645 (void) dt_set_errno(dtp, EINVAL); 646 return (NULL); 647 } 648 649 flags |= dtp->dt_dflags; 650 651 if (dof_hdr(dtp, pgp->dp_dofversion, &h) != 0) 652 return (NULL); 653 654 if (dt_dof_reset(dtp, pgp) != 0) 655 return (NULL); 656 657 /* 658 * Iterate through the statement list computing the maximum number of 659 * actions and the maximum format string for allocating local buffers. 660 */ 661 for (last = NULL, stp = dt_list_next(&pgp->dp_stmts); 662 stp != NULL; stp = dt_list_next(stp), last = edp) { 663 664 dtrace_stmtdesc_t *sdp = stp->ds_desc; 665 dtrace_actdesc_t *ap = sdp->dtsd_action; 666 667 if (sdp->dtsd_fmtdata != NULL) { 668 i = dtrace_printf_format(dtp, 669 sdp->dtsd_fmtdata, NULL, 0); 670 maxfmt = MAX(maxfmt, i); 671 } 672 673 if ((edp = sdp->dtsd_ecbdesc) == last) 674 continue; /* same ecb as previous statement */ 675 676 for (i = 0, ap = edp->dted_action; ap; ap = ap->dtad_next) 677 i++; 678 679 maxacts = MAX(maxacts, i); 680 } 681 682 dofa = alloca(sizeof (dof_actdesc_t) * maxacts); 683 fmt = alloca(maxfmt + 1); 684 685 ddo->ddo_strsec = dof_add_lsect(ddo, NULL, DOF_SECT_STRTAB, 1, 0, 0, 0); 686 (void) dof_add_string(ddo, ""); 687 688 /* 689 * If there are references to dynamic translators in the program, add 690 * an imported translator table entry for each referenced translator. 691 */ 692 if (pgp->dp_xrefslen != 0) { 693 for (dxp = dt_list_next(&dtp->dt_xlators); 694 dxp != NULL; dxp = dt_list_next(dxp)) { 695 if (dxp->dx_id < pgp->dp_xrefslen && 696 pgp->dp_xrefs[dxp->dx_id] != NULL) 697 dof_add_translator(ddo, dxp, DOF_SECT_XLIMPORT); 698 } 699 } 700 701 /* 702 * Now iterate through the statement list, creating the DOF section 703 * headers and data for each one and adding them to our buffers. 704 */ 705 for (last = NULL, stp = dt_list_next(&pgp->dp_stmts); 706 stp != NULL; stp = dt_list_next(stp), last = edp) { 707 708 dof_secidx_t probesec = DOF_SECIDX_NONE; 709 dof_secidx_t prdsec = DOF_SECIDX_NONE; 710 dof_secidx_t actsec = DOF_SECIDX_NONE; 711 712 const dt_stmt_t *next = stp; 713 dtrace_stmtdesc_t *sdp = stp->ds_desc; 714 dof_stridx_t strndx = 0; 715 dof_probedesc_t dofp; 716 dof_ecbdesc_t dofe; 717 uint_t i; 718 719 if ((edp = stp->ds_desc->dtsd_ecbdesc) == last) 720 continue; /* same ecb as previous statement */ 721 722 pdp = &edp->dted_probe; 723 724 /* 725 * Add a DOF_SECT_PROBEDESC for the ECB's probe description, 726 * and copy the probe description strings into the string table. 727 */ 728 dofp.dofp_strtab = ddo->ddo_strsec; 729 dofp.dofp_provider = dof_add_string(ddo, pdp->dtpd_provider); 730 dofp.dofp_mod = dof_add_string(ddo, pdp->dtpd_mod); 731 dofp.dofp_func = dof_add_string(ddo, pdp->dtpd_func); 732 dofp.dofp_name = dof_add_string(ddo, pdp->dtpd_name); 733 dofp.dofp_id = pdp->dtpd_id; 734 735 probesec = dof_add_lsect(ddo, &dofp, DOF_SECT_PROBEDESC, 736 sizeof (dof_secidx_t), 0, 737 sizeof (dof_probedesc_t), sizeof (dof_probedesc_t)); 738 739 /* 740 * If there is a predicate DIFO associated with the ecbdesc, 741 * write out the DIFO sections and save the DIFO section index. 742 */ 743 if (edp->dted_pred.dtpdd_difo != NULL) 744 prdsec = dof_add_difo(ddo, edp->dted_pred.dtpdd_difo); 745 746 /* 747 * Now iterate through the action list generating DIFOs as 748 * referenced therein and adding action descriptions to 'dofa'. 749 */ 750 for (i = 0, ap = edp->dted_action; 751 ap != NULL; ap = ap->dtad_next, i++) { 752 753 if (ap->dtad_difo != NULL) { 754 dofa[i].dofa_difo = 755 dof_add_difo(ddo, ap->dtad_difo); 756 } else 757 dofa[i].dofa_difo = DOF_SECIDX_NONE; 758 759 /* 760 * If the first action in a statement has format data, 761 * add the format string to the global string table. 762 */ 763 if (sdp != NULL && ap == sdp->dtsd_action) { 764 if (sdp->dtsd_fmtdata != NULL) { 765 (void) dtrace_printf_format(dtp, 766 sdp->dtsd_fmtdata, fmt, maxfmt + 1); 767 strndx = dof_add_string(ddo, fmt); 768 } else 769 strndx = 0; /* use dtad_arg instead */ 770 771 if ((next = dt_list_next(next)) != NULL) 772 sdp = next->ds_desc; 773 else 774 sdp = NULL; 775 } 776 777 if (strndx != 0) { 778 dofa[i].dofa_arg = strndx; 779 dofa[i].dofa_strtab = ddo->ddo_strsec; 780 } else { 781 dofa[i].dofa_arg = ap->dtad_arg; 782 dofa[i].dofa_strtab = DOF_SECIDX_NONE; 783 } 784 785 dofa[i].dofa_kind = ap->dtad_kind; 786 dofa[i].dofa_ntuple = ap->dtad_ntuple; 787 dofa[i].dofa_uarg = ap->dtad_uarg; 788 } 789 790 if (i > 0) { 791 actsec = dof_add_lsect(ddo, dofa, DOF_SECT_ACTDESC, 792 sizeof (uint64_t), 0, sizeof (dof_actdesc_t), 793 sizeof (dof_actdesc_t) * i); 794 } 795 796 /* 797 * Now finally, add the DOF_SECT_ECBDESC referencing all the 798 * previously created sub-sections. 799 */ 800 dofe.dofe_probes = probesec; 801 dofe.dofe_pred = prdsec; 802 dofe.dofe_actions = actsec; 803 dofe.dofe_pad = 0; 804 dofe.dofe_uarg = edp->dted_uarg; 805 806 (void) dof_add_lsect(ddo, &dofe, DOF_SECT_ECBDESC, 807 sizeof (uint64_t), 0, 0, sizeof (dof_ecbdesc_t)); 808 } 809 810 /* 811 * If any providers are user-defined, output DOF sections corresponding 812 * to the providers and the probes and arguments that they define. 813 */ 814 if (flags & DTRACE_D_PROBES) { 815 for (pvp = dt_list_next(&dtp->dt_provlist); 816 pvp != NULL; pvp = dt_list_next(pvp)) 817 dof_add_provider(ddo, pvp); 818 } 819 820 /* 821 * If we're not stripping unloadable sections, generate compiler 822 * comments and any other unloadable miscellany. 823 */ 824 if (!(flags & DTRACE_D_STRIP)) { 825 (void) dof_add_usect(ddo, _dtrace_version, DOF_SECT_COMMENTS, 826 sizeof (char), 0, 0, strlen(_dtrace_version) + 1); 827 (void) dof_add_usect(ddo, &dtp->dt_uts, DOF_SECT_UTSNAME, 828 sizeof (char), 0, 0, sizeof (struct utsname)); 829 } 830 831 /* 832 * Compute and fill in the appropriate values for the dof_hdr_t's 833 * dofh_secnum, dofh_loadsz, and dofh_filez values. 834 */ 835 h.dofh_secnum = ddo->ddo_nsecs; 836 ssize = sizeof (h) + dt_buf_len(&ddo->ddo_secs); 837 assert(ssize == sizeof (h) + sizeof (dof_sec_t) * ddo->ddo_nsecs); 838 839 h.dofh_loadsz = ssize + 840 dt_buf_len(&ddo->ddo_ldata) + 841 dt_buf_len(&ddo->ddo_strs); 842 843 if (dt_buf_len(&ddo->ddo_udata) != 0) { 844 lsize = roundup(h.dofh_loadsz, sizeof (uint64_t)); 845 h.dofh_filesz = lsize + dt_buf_len(&ddo->ddo_udata); 846 } else { 847 lsize = h.dofh_loadsz; 848 h.dofh_filesz = lsize; 849 } 850 851 /* 852 * Set the global DOF_SECT_STRTAB's offset to be after the header, 853 * section headers, and other loadable data. Since we're going to 854 * iterate over the buffer data directly, we must check for errors. 855 */ 856 if ((i = dt_buf_error(&ddo->ddo_secs)) != 0) { 857 (void) dt_set_errno(dtp, i); 858 return (NULL); 859 } 860 861 sp = dt_buf_ptr(&ddo->ddo_secs); 862 assert(sp[ddo->ddo_strsec].dofs_type == DOF_SECT_STRTAB); 863 864 sp[ddo->ddo_strsec].dofs_offset = ssize + dt_buf_len(&ddo->ddo_ldata); 865 sp[ddo->ddo_strsec].dofs_size = dt_buf_len(&ddo->ddo_strs); 866 867 /* 868 * Now relocate all the other section headers by adding the appropriate 869 * delta to their respective dofs_offset values. 870 */ 871 for (i = 0; i < ddo->ddo_nsecs; i++, sp++) { 872 if (i == ddo->ddo_strsec) 873 continue; /* already relocated above */ 874 875 if (sp->dofs_flags & DOF_SECF_LOAD) 876 sp->dofs_offset += ssize; 877 else 878 sp->dofs_offset += lsize; 879 } 880 881 /* 882 * Finally, assemble the complete in-memory DOF buffer by writing the 883 * header and then concatenating all our buffers. dt_buf_concat() will 884 * propagate any errors and cause dt_buf_claim() to return NULL. 885 */ 886 dt_buf_create(dtp, &dof, "dof", h.dofh_filesz); 887 888 dt_buf_write(dtp, &dof, &h, sizeof (h), sizeof (uint64_t)); 889 dt_buf_concat(dtp, &dof, &ddo->ddo_secs, sizeof (uint64_t)); 890 dt_buf_concat(dtp, &dof, &ddo->ddo_ldata, sizeof (uint64_t)); 891 dt_buf_concat(dtp, &dof, &ddo->ddo_strs, sizeof (char)); 892 dt_buf_concat(dtp, &dof, &ddo->ddo_udata, sizeof (uint64_t)); 893 894 return (dt_buf_claim(dtp, &dof)); 895 } 896 897 void 898 dtrace_dof_destroy(dtrace_hdl_t *dtp, void *dof) 899 { 900 dt_free(dtp, dof); 901 } 902 903 void * 904 dtrace_getopt_dof(dtrace_hdl_t *dtp) 905 { 906 dof_hdr_t *dof; 907 dof_sec_t *sec; 908 dof_optdesc_t *dofo; 909 int i, nopts = 0, len = sizeof (dof_hdr_t) + 910 roundup(sizeof (dof_sec_t), sizeof (uint64_t)); 911 912 for (i = 0; i < DTRACEOPT_MAX; i++) { 913 if (dtp->dt_options[i] != DTRACEOPT_UNSET) 914 nopts++; 915 } 916 917 len += sizeof (dof_optdesc_t) * nopts; 918 919 if ((dof = dt_zalloc(dtp, len)) == NULL || 920 dof_hdr(dtp, DOF_VERSION, dof) != 0) { 921 dt_free(dtp, dof); 922 return (NULL); 923 } 924 925 dof->dofh_secnum = 1; /* only DOF_SECT_OPTDESC */ 926 dof->dofh_loadsz = len; 927 dof->dofh_filesz = len; 928 929 /* 930 * Fill in the option section header... 931 */ 932 sec = (dof_sec_t *)((uintptr_t)dof + sizeof (dof_hdr_t)); 933 sec->dofs_type = DOF_SECT_OPTDESC; 934 sec->dofs_align = sizeof (uint64_t); 935 sec->dofs_flags = DOF_SECF_LOAD; 936 sec->dofs_entsize = sizeof (dof_optdesc_t); 937 938 dofo = (dof_optdesc_t *)((uintptr_t)sec + 939 roundup(sizeof (dof_sec_t), sizeof (uint64_t))); 940 941 sec->dofs_offset = (uintptr_t)dofo - (uintptr_t)dof; 942 sec->dofs_size = sizeof (dof_optdesc_t) * nopts; 943 944 for (i = 0; i < DTRACEOPT_MAX; i++) { 945 if (dtp->dt_options[i] == DTRACEOPT_UNSET) 946 continue; 947 948 dofo->dofo_option = i; 949 dofo->dofo_strtab = DOF_SECIDX_NONE; 950 dofo->dofo_value = dtp->dt_options[i]; 951 dofo++; 952 } 953 954 return (dof); 955 } 956 957 void * 958 dtrace_geterr_dof(dtrace_hdl_t *dtp) 959 { 960 if (dtp->dt_errprog != NULL) 961 return (dtrace_dof_create(dtp, dtp->dt_errprog, 0)); 962 963 (void) dt_set_errno(dtp, EDT_BADERROR); 964 return (NULL); 965 } 966