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  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #pragma ident	"%Z%%M%	%I%	%E% SMI"
27 
28 #include <stddef.h>
29 #include <stdlib.h>
30 #include <strings.h>
31 #include <errno.h>
32 #include <unistd.h>
33 #include <assert.h>
34 #ifdef illumos
35 #include <alloca.h>
36 #endif
37 
38 #include <dt_impl.h>
39 #include <dt_program.h>
40 
41 static const char _dt_errprog[] =
42 "dtrace:::ERROR"
43 "{"
44 "	trace(arg1);"
45 "	trace(arg2);"
46 "	trace(arg3);"
47 "	trace(arg4);"
48 "	trace(arg5);"
49 "}";
50 
51 int
52 dtrace_handle_err(dtrace_hdl_t *dtp, dtrace_handle_err_f *hdlr, void *arg)
53 {
54 	dtrace_prog_t *pgp = NULL;
55 	dt_stmt_t *stp;
56 	dtrace_ecbdesc_t *edp;
57 
58 	/*
59 	 * We don't currently support multiple error handlers.
60 	 */
61 	if (dtp->dt_errhdlr != NULL)
62 		return (dt_set_errno(dtp, EALREADY));
63 
64 	/*
65 	 * If the DTRACEOPT_GRABANON is enabled, the anonymous enabling will
66 	 * already have a dtrace:::ERROR probe enabled; save 'hdlr' and 'arg'
67 	 * but do not bother compiling and enabling _dt_errprog.
68 	 */
69 	if (dtp->dt_options[DTRACEOPT_GRABANON] != DTRACEOPT_UNSET)
70 		goto out;
71 
72 	if ((pgp = dtrace_program_strcompile(dtp, _dt_errprog,
73 	    DTRACE_PROBESPEC_NAME, DTRACE_C_ZDEFS, 0, NULL)) == NULL)
74 		return (dt_set_errno(dtp, dtrace_errno(dtp)));
75 
76 	stp = dt_list_next(&pgp->dp_stmts);
77 	assert(stp != NULL);
78 
79 	edp = stp->ds_desc->dtsd_ecbdesc;
80 	assert(edp != NULL);
81 	edp->dted_uarg = DT_ECB_ERROR;
82 
83 out:
84 	dtp->dt_errhdlr = hdlr;
85 	dtp->dt_errarg = arg;
86 	dtp->dt_errprog = pgp;
87 
88 	return (0);
89 }
90 
91 int
92 dtrace_handle_drop(dtrace_hdl_t *dtp, dtrace_handle_drop_f *hdlr, void *arg)
93 {
94 	if (dtp->dt_drophdlr != NULL)
95 		return (dt_set_errno(dtp, EALREADY));
96 
97 	dtp->dt_drophdlr = hdlr;
98 	dtp->dt_droparg = arg;
99 
100 	return (0);
101 }
102 
103 int
104 dtrace_handle_proc(dtrace_hdl_t *dtp, dtrace_handle_proc_f *hdlr, void *arg)
105 {
106 	if (dtp->dt_prochdlr != NULL)
107 		return (dt_set_errno(dtp, EALREADY));
108 
109 	dtp->dt_prochdlr = hdlr;
110 	dtp->dt_procarg = arg;
111 
112 	return (0);
113 }
114 
115 int
116 dtrace_handle_buffered(dtrace_hdl_t *dtp, dtrace_handle_buffered_f *hdlr,
117     void *arg)
118 {
119 	if (dtp->dt_bufhdlr != NULL)
120 		return (dt_set_errno(dtp, EALREADY));
121 
122 	if (hdlr == NULL)
123 		return (dt_set_errno(dtp, EINVAL));
124 
125 	dtp->dt_bufhdlr = hdlr;
126 	dtp->dt_bufarg = arg;
127 
128 	return (0);
129 }
130 
131 int
132 dtrace_handle_setopt(dtrace_hdl_t *dtp, dtrace_handle_setopt_f *hdlr,
133     void *arg)
134 {
135 	if (hdlr == NULL)
136 		return (dt_set_errno(dtp, EINVAL));
137 
138 	dtp->dt_setopthdlr = hdlr;
139 	dtp->dt_setoptarg = arg;
140 
141 	return (0);
142 }
143 
144 #define	DT_REC(type, ndx) *((type *)((uintptr_t)data->dtpda_data + \
145     epd->dtepd_rec[(ndx)].dtrd_offset))
146 
147 static int
148 dt_handle_err(dtrace_hdl_t *dtp, dtrace_probedata_t *data)
149 {
150 	dtrace_eprobedesc_t *epd = data->dtpda_edesc, *errepd;
151 	dtrace_probedesc_t *pd = data->dtpda_pdesc, *errpd;
152 	dtrace_errdata_t err;
153 	dtrace_epid_t epid;
154 
155 	char where[30];
156 	char details[30];
157 	char offinfo[30];
158 	const int slop = 80;
159 	const char *faultstr;
160 	char *str;
161 	int len;
162 
163 	assert(epd->dtepd_uarg == DT_ECB_ERROR);
164 
165 	if (epd->dtepd_nrecs != 5 || strcmp(pd->dtpd_provider, "dtrace") != 0 ||
166 	    strcmp(pd->dtpd_name, "ERROR") != 0)
167 		return (dt_set_errno(dtp, EDT_BADERROR));
168 
169 	/*
170 	 * This is an error.  We have the following items here:  EPID,
171 	 * faulting action, DIF offset, fault code and faulting address.
172 	 */
173 	epid = (uint32_t)DT_REC(uint64_t, 0);
174 
175 	if (dt_epid_lookup(dtp, epid, &errepd, &errpd) != 0)
176 		return (dt_set_errno(dtp, EDT_BADERROR));
177 
178 	err.dteda_edesc = errepd;
179 	err.dteda_pdesc = errpd;
180 	err.dteda_cpu = data->dtpda_cpu;
181 	err.dteda_action = (int)DT_REC(uint64_t, 1);
182 	err.dteda_offset = (int)DT_REC(uint64_t, 2);
183 	err.dteda_fault = (int)DT_REC(uint64_t, 3);
184 	err.dteda_addr = DT_REC(uint64_t, 4);
185 
186 	faultstr = dtrace_faultstr(dtp, err.dteda_fault);
187 	len = sizeof (where) + sizeof (offinfo) + strlen(faultstr) +
188 	    strlen(errpd->dtpd_provider) + strlen(errpd->dtpd_mod) +
189 	    strlen(errpd->dtpd_name) + strlen(errpd->dtpd_func) +
190 	    slop;
191 
192 	str = (char *)alloca(len);
193 
194 	if (err.dteda_action == 0) {
195 		(void) sprintf(where, "predicate");
196 	} else {
197 		(void) sprintf(where, "action #%d", err.dteda_action);
198 	}
199 
200 	if (err.dteda_offset != -1) {
201 		(void) sprintf(offinfo, " at DIF offset %d", err.dteda_offset);
202 	} else {
203 		offinfo[0] = 0;
204 	}
205 
206 	switch (err.dteda_fault) {
207 	case DTRACEFLT_BADADDR:
208 	case DTRACEFLT_BADALIGN:
209 	case DTRACEFLT_BADSTACK:
210 		(void) sprintf(details, " (0x%llx)",
211 		    (u_longlong_t)err.dteda_addr);
212 		break;
213 
214 	default:
215 		details[0] = 0;
216 	}
217 
218 	(void) snprintf(str, len, "error on enabled probe ID %u "
219 	    "(ID %u: %s:%s:%s:%s): %s%s in %s%s\n",
220 	    epid, errpd->dtpd_id, errpd->dtpd_provider,
221 	    errpd->dtpd_mod, errpd->dtpd_func,
222 	    errpd->dtpd_name, dtrace_faultstr(dtp, err.dteda_fault),
223 	    details, where, offinfo);
224 
225 	err.dteda_msg = str;
226 
227 	if (dtp->dt_errhdlr == NULL)
228 		return (dt_set_errno(dtp, EDT_ERRABORT));
229 
230 	if ((*dtp->dt_errhdlr)(&err, dtp->dt_errarg) == DTRACE_HANDLE_ABORT)
231 		return (dt_set_errno(dtp, EDT_ERRABORT));
232 
233 	return (0);
234 }
235 
236 int
237 dt_handle_liberr(dtrace_hdl_t *dtp, const dtrace_probedata_t *data,
238     const char *faultstr)
239 {
240 	dtrace_probedesc_t *errpd = data->dtpda_pdesc;
241 	dtrace_errdata_t err;
242 	const int slop = 80;
243 	char *str;
244 	int len;
245 
246 	err.dteda_edesc = data->dtpda_edesc;
247 	err.dteda_pdesc = errpd;
248 	err.dteda_cpu = data->dtpda_cpu;
249 	err.dteda_action = -1;
250 	err.dteda_offset = -1;
251 	err.dteda_fault = DTRACEFLT_LIBRARY;
252 	err.dteda_addr = 0;
253 
254 	len = strlen(faultstr) +
255 	    strlen(errpd->dtpd_provider) + strlen(errpd->dtpd_mod) +
256 	    strlen(errpd->dtpd_name) + strlen(errpd->dtpd_func) +
257 	    slop;
258 
259 	str = alloca(len);
260 
261 	(void) snprintf(str, len, "error on enabled probe ID %u "
262 	    "(ID %u: %s:%s:%s:%s): %s\n",
263 	    data->dtpda_edesc->dtepd_epid,
264 	    errpd->dtpd_id, errpd->dtpd_provider,
265 	    errpd->dtpd_mod, errpd->dtpd_func,
266 	    errpd->dtpd_name, faultstr);
267 
268 	err.dteda_msg = str;
269 
270 	if (dtp->dt_errhdlr == NULL)
271 		return (dt_set_errno(dtp, EDT_ERRABORT));
272 
273 	if ((*dtp->dt_errhdlr)(&err, dtp->dt_errarg) == DTRACE_HANDLE_ABORT)
274 		return (dt_set_errno(dtp, EDT_ERRABORT));
275 
276 	return (0);
277 }
278 
279 #define	DROPTAG(x)	x, #x
280 
281 static const struct {
282 	dtrace_dropkind_t dtdrg_kind;
283 	char *dtdrg_tag;
284 } _dt_droptags[] = {
285 	{ DROPTAG(DTRACEDROP_PRINCIPAL) },
286 	{ DROPTAG(DTRACEDROP_AGGREGATION) },
287 	{ DROPTAG(DTRACEDROP_DYNAMIC) },
288 	{ DROPTAG(DTRACEDROP_DYNRINSE) },
289 	{ DROPTAG(DTRACEDROP_DYNDIRTY) },
290 	{ DROPTAG(DTRACEDROP_SPEC) },
291 	{ DROPTAG(DTRACEDROP_SPECBUSY) },
292 	{ DROPTAG(DTRACEDROP_SPECUNAVAIL) },
293 	{ DROPTAG(DTRACEDROP_DBLERROR) },
294 	{ DROPTAG(DTRACEDROP_STKSTROVERFLOW) },
295 	{ 0, NULL }
296 };
297 
298 static const char *
299 dt_droptag(dtrace_dropkind_t kind)
300 {
301 	int i;
302 
303 	for (i = 0; _dt_droptags[i].dtdrg_tag != NULL; i++) {
304 		if (_dt_droptags[i].dtdrg_kind == kind)
305 			return (_dt_droptags[i].dtdrg_tag);
306 	}
307 
308 	return ("DTRACEDROP_UNKNOWN");
309 }
310 
311 int
312 dt_handle_cpudrop(dtrace_hdl_t *dtp, processorid_t cpu,
313     dtrace_dropkind_t what, uint64_t howmany)
314 {
315 	dtrace_dropdata_t drop;
316 	char str[80], *s;
317 	int size;
318 
319 	assert(what == DTRACEDROP_PRINCIPAL || what == DTRACEDROP_AGGREGATION);
320 
321 	bzero(&drop, sizeof (drop));
322 	drop.dtdda_handle = dtp;
323 	drop.dtdda_cpu = cpu;
324 	drop.dtdda_kind = what;
325 	drop.dtdda_drops = howmany;
326 	drop.dtdda_msg = str;
327 
328 	if (dtp->dt_droptags) {
329 		(void) snprintf(str, sizeof (str), "[%s] ", dt_droptag(what));
330 		s = &str[strlen(str)];
331 		size = sizeof (str) - (s - str);
332 	} else {
333 		s = str;
334 		size = sizeof (str);
335 	}
336 
337 	(void) snprintf(s, size, "%llu %sdrop%s on CPU %d\n",
338 	    (u_longlong_t)howmany,
339 	    what == DTRACEDROP_PRINCIPAL ? "" : "aggregation ",
340 	    howmany > 1 ? "s" : "", cpu);
341 
342 	if (dtp->dt_drophdlr == NULL)
343 		return (dt_set_errno(dtp, EDT_DROPABORT));
344 
345 	if ((*dtp->dt_drophdlr)(&drop, dtp->dt_droparg) == DTRACE_HANDLE_ABORT)
346 		return (dt_set_errno(dtp, EDT_DROPABORT));
347 
348 	return (0);
349 }
350 
351 static const struct {
352 	dtrace_dropkind_t dtdrt_kind;
353 	uintptr_t dtdrt_offset;
354 	const char *dtdrt_str;
355 	const char *dtdrt_msg;
356 } _dt_droptab[] = {
357 	{ DTRACEDROP_DYNAMIC,
358 	    offsetof(dtrace_status_t, dtst_dyndrops),
359 	    "dynamic variable drop" },
360 
361 	{ DTRACEDROP_DYNRINSE,
362 	    offsetof(dtrace_status_t, dtst_dyndrops_rinsing),
363 	    "dynamic variable drop", " with non-empty rinsing list" },
364 
365 	{ DTRACEDROP_DYNDIRTY,
366 	    offsetof(dtrace_status_t, dtst_dyndrops_dirty),
367 	    "dynamic variable drop", " with non-empty dirty list" },
368 
369 	{ DTRACEDROP_SPEC,
370 	    offsetof(dtrace_status_t, dtst_specdrops),
371 	    "speculative drop" },
372 
373 	{ DTRACEDROP_SPECBUSY,
374 	    offsetof(dtrace_status_t, dtst_specdrops_busy),
375 	    "failed speculation", " (available buffer(s) still busy)" },
376 
377 	{ DTRACEDROP_SPECUNAVAIL,
378 	    offsetof(dtrace_status_t, dtst_specdrops_unavail),
379 	    "failed speculation", " (no speculative buffer available)" },
380 
381 	{ DTRACEDROP_STKSTROVERFLOW,
382 	    offsetof(dtrace_status_t, dtst_stkstroverflows),
383 	    "jstack()/ustack() string table overflow" },
384 
385 	{ DTRACEDROP_DBLERROR,
386 	    offsetof(dtrace_status_t, dtst_dblerrors),
387 	    "error", " in ERROR probe enabling" },
388 
389 	{ 0, 0, NULL }
390 };
391 
392 int
393 dt_handle_status(dtrace_hdl_t *dtp, dtrace_status_t *old, dtrace_status_t *new)
394 {
395 	dtrace_dropdata_t drop;
396 	char str[80], *s;
397 	uintptr_t base = (uintptr_t)new, obase = (uintptr_t)old;
398 	int i, size;
399 
400 	bzero(&drop, sizeof (drop));
401 	drop.dtdda_handle = dtp;
402 	drop.dtdda_cpu = DTRACE_CPUALL;
403 	drop.dtdda_msg = str;
404 
405 	/*
406 	 * First, check to see if we've been killed -- in which case we abort.
407 	 */
408 	if (new->dtst_killed && !old->dtst_killed)
409 		return (dt_set_errno(dtp, EDT_BRICKED));
410 
411 	for (i = 0; _dt_droptab[i].dtdrt_str != NULL; i++) {
412 		uintptr_t naddr = base + _dt_droptab[i].dtdrt_offset;
413 		uintptr_t oaddr = obase + _dt_droptab[i].dtdrt_offset;
414 
415 		uint64_t nval = *((uint64_t *)naddr);
416 		uint64_t oval = *((uint64_t *)oaddr);
417 
418 		if (nval == oval)
419 			continue;
420 
421 		if (dtp->dt_droptags) {
422 			(void) snprintf(str, sizeof (str), "[%s] ",
423 			    dt_droptag(_dt_droptab[i].dtdrt_kind));
424 			s = &str[strlen(str)];
425 			size = sizeof (str) - (s - str);
426 		} else {
427 			s = str;
428 			size = sizeof (str);
429 		}
430 
431 		(void) snprintf(s, size, "%llu %s%s%s\n",
432 		    (u_longlong_t)(nval - oval),
433 		    _dt_droptab[i].dtdrt_str, (nval - oval > 1) ? "s" : "",
434 		    _dt_droptab[i].dtdrt_msg != NULL ?
435 		    _dt_droptab[i].dtdrt_msg : "");
436 
437 		drop.dtdda_kind = _dt_droptab[i].dtdrt_kind;
438 		drop.dtdda_total = nval;
439 		drop.dtdda_drops = nval - oval;
440 
441 		if (dtp->dt_drophdlr == NULL)
442 			return (dt_set_errno(dtp, EDT_DROPABORT));
443 
444 		if ((*dtp->dt_drophdlr)(&drop,
445 		    dtp->dt_droparg) == DTRACE_HANDLE_ABORT)
446 			return (dt_set_errno(dtp, EDT_DROPABORT));
447 	}
448 
449 	return (0);
450 }
451 
452 int
453 dt_handle_setopt(dtrace_hdl_t *dtp, dtrace_setoptdata_t *data)
454 {
455 	void *arg = dtp->dt_setoptarg;
456 
457 	if (dtp->dt_setopthdlr == NULL)
458 		return (0);
459 
460 	if ((*dtp->dt_setopthdlr)(data, arg) == DTRACE_HANDLE_ABORT)
461 		return (dt_set_errno(dtp, EDT_DIRABORT));
462 
463 	return (0);
464 }
465 
466 int
467 dt_handle(dtrace_hdl_t *dtp, dtrace_probedata_t *data)
468 {
469 	dtrace_eprobedesc_t *epd = data->dtpda_edesc;
470 	int rval;
471 
472 	switch (epd->dtepd_uarg) {
473 	case DT_ECB_ERROR:
474 		rval = dt_handle_err(dtp, data);
475 		break;
476 
477 	default:
478 		return (DTRACE_CONSUME_THIS);
479 	}
480 
481 	if (rval == 0)
482 		return (DTRACE_CONSUME_NEXT);
483 
484 	return (DTRACE_CONSUME_ERROR);
485 }
486