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7127 remove -Wno-missing-braces from Makefile.uts
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--- old/usr/src/uts/common/dtrace/systrace.c
+++ new/usr/src/uts/common/dtrace/systrace.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 23 * Use is subject to license terms.
24 24 */
25 25
26 26
27 27 #include <sys/dtrace.h>
28 28 #include <sys/systrace.h>
29 29 #include <sys/stat.h>
30 30 #include <sys/systm.h>
31 31 #include <sys/conf.h>
32 32 #include <sys/ddi.h>
33 33 #include <sys/sunddi.h>
34 34 #include <sys/atomic.h>
35 35
36 36 #define SYSTRACE_ARTIFICIAL_FRAMES 1
37 37
38 38 #define SYSTRACE_SHIFT 16
39 39 #define SYSTRACE_ISENTRY(x) ((int)(x) >> SYSTRACE_SHIFT)
40 40 #define SYSTRACE_SYSNUM(x) ((int)(x) & ((1 << SYSTRACE_SHIFT) - 1))
41 41 #define SYSTRACE_ENTRY(id) ((1 << SYSTRACE_SHIFT) | (id))
42 42 #define SYSTRACE_RETURN(id) (id)
43 43
44 44 #if ((1 << SYSTRACE_SHIFT) <= NSYSCALL)
45 45 #error 1 << SYSTRACE_SHIFT must exceed number of system calls
46 46 #endif
47 47
48 48 static dev_info_t *systrace_devi;
49 49 static dtrace_provider_id_t systrace_id;
50 50
51 51 static void
52 52 systrace_init(struct sysent *actual, systrace_sysent_t **interposed)
53 53 {
54 54 systrace_sysent_t *sysent = *interposed;
55 55 int i;
56 56
57 57 if (sysent == NULL) {
58 58 *interposed = sysent = kmem_zalloc(sizeof (systrace_sysent_t) *
59 59 NSYSCALL, KM_SLEEP);
60 60 }
61 61
62 62 for (i = 0; i < NSYSCALL; i++) {
63 63 struct sysent *a = &actual[i];
64 64 systrace_sysent_t *s = &sysent[i];
65 65
66 66 if (LOADABLE_SYSCALL(a) && !LOADED_SYSCALL(a))
67 67 continue;
68 68
69 69 if (a->sy_callc == dtrace_systrace_syscall)
70 70 continue;
71 71
72 72 #ifdef _SYSCALL32_IMPL
73 73 if (a->sy_callc == dtrace_systrace_syscall32)
74 74 continue;
75 75 #endif
76 76
77 77 s->stsy_underlying = a->sy_callc;
78 78 }
79 79 }
80 80
81 81 /*ARGSUSED*/
82 82 static void
83 83 systrace_provide(void *arg, const dtrace_probedesc_t *desc)
84 84 {
85 85 int i;
86 86
87 87 if (desc != NULL)
88 88 return;
89 89
90 90 systrace_init(sysent, &systrace_sysent);
91 91 #ifdef _SYSCALL32_IMPL
92 92 systrace_init(sysent32, &systrace_sysent32);
93 93 #endif
94 94
95 95 for (i = 0; i < NSYSCALL; i++) {
96 96 if (systrace_sysent[i].stsy_underlying == NULL)
97 97 continue;
98 98
99 99 if (dtrace_probe_lookup(systrace_id, NULL,
100 100 syscallnames[i], "entry") != 0)
101 101 continue;
102 102
103 103 (void) dtrace_probe_create(systrace_id, NULL, syscallnames[i],
104 104 "entry", SYSTRACE_ARTIFICIAL_FRAMES,
105 105 (void *)((uintptr_t)SYSTRACE_ENTRY(i)));
106 106 (void) dtrace_probe_create(systrace_id, NULL, syscallnames[i],
107 107 "return", SYSTRACE_ARTIFICIAL_FRAMES,
108 108 (void *)((uintptr_t)SYSTRACE_RETURN(i)));
109 109
110 110 systrace_sysent[i].stsy_entry = DTRACE_IDNONE;
111 111 systrace_sysent[i].stsy_return = DTRACE_IDNONE;
112 112 #ifdef _SYSCALL32_IMPL
113 113 systrace_sysent32[i].stsy_entry = DTRACE_IDNONE;
114 114 systrace_sysent32[i].stsy_return = DTRACE_IDNONE;
115 115 #endif
116 116 }
117 117 }
118 118
119 119 /*ARGSUSED*/
120 120 static void
121 121 systrace_destroy(void *arg, dtrace_id_t id, void *parg)
122 122 {
123 123 int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
124 124
125 125 /*
126 126 * There's nothing to do here but assert that we have actually been
127 127 * disabled.
128 128 */
129 129 if (SYSTRACE_ISENTRY((uintptr_t)parg)) {
130 130 ASSERT(systrace_sysent[sysnum].stsy_entry == DTRACE_IDNONE);
131 131 #ifdef _SYSCALL32_IMPL
132 132 ASSERT(systrace_sysent32[sysnum].stsy_entry == DTRACE_IDNONE);
133 133 #endif
134 134 } else {
135 135 ASSERT(systrace_sysent[sysnum].stsy_return == DTRACE_IDNONE);
136 136 #ifdef _SYSCALL32_IMPL
137 137 ASSERT(systrace_sysent32[sysnum].stsy_return == DTRACE_IDNONE);
138 138 #endif
139 139 }
140 140 }
141 141
142 142 /*ARGSUSED*/
143 143 static int
144 144 systrace_enable(void *arg, dtrace_id_t id, void *parg)
145 145 {
146 146 int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
147 147 int enabled = (systrace_sysent[sysnum].stsy_entry != DTRACE_IDNONE ||
148 148 systrace_sysent[sysnum].stsy_return != DTRACE_IDNONE);
149 149
150 150 if (SYSTRACE_ISENTRY((uintptr_t)parg)) {
151 151 systrace_sysent[sysnum].stsy_entry = id;
152 152 #ifdef _SYSCALL32_IMPL
153 153 systrace_sysent32[sysnum].stsy_entry = id;
154 154 #endif
155 155 } else {
156 156 systrace_sysent[sysnum].stsy_return = id;
157 157 #ifdef _SYSCALL32_IMPL
158 158 systrace_sysent32[sysnum].stsy_return = id;
159 159 #endif
160 160 }
161 161
162 162 if (enabled) {
163 163 ASSERT(sysent[sysnum].sy_callc == dtrace_systrace_syscall);
164 164 return (0);
165 165 }
166 166
167 167 (void) atomic_cas_ptr(&sysent[sysnum].sy_callc,
168 168 (void *)systrace_sysent[sysnum].stsy_underlying,
169 169 (void *)dtrace_systrace_syscall);
170 170 #ifdef _SYSCALL32_IMPL
171 171 (void) atomic_cas_ptr(&sysent32[sysnum].sy_callc,
172 172 (void *)systrace_sysent32[sysnum].stsy_underlying,
173 173 (void *)dtrace_systrace_syscall32);
174 174 #endif
175 175 return (0);
176 176 }
177 177
178 178 /*ARGSUSED*/
179 179 static void
180 180 systrace_disable(void *arg, dtrace_id_t id, void *parg)
181 181 {
182 182 int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
183 183 int disable = (systrace_sysent[sysnum].stsy_entry == DTRACE_IDNONE ||
184 184 systrace_sysent[sysnum].stsy_return == DTRACE_IDNONE);
185 185
186 186 if (disable) {
187 187 (void) atomic_cas_ptr(&sysent[sysnum].sy_callc,
188 188 (void *)dtrace_systrace_syscall,
189 189 (void *)systrace_sysent[sysnum].stsy_underlying);
190 190
191 191 #ifdef _SYSCALL32_IMPL
192 192 (void) atomic_cas_ptr(&sysent32[sysnum].sy_callc,
193 193 (void *)dtrace_systrace_syscall32,
194 194 (void *)systrace_sysent32[sysnum].stsy_underlying);
195 195 #endif
196 196 }
197 197
198 198 if (SYSTRACE_ISENTRY((uintptr_t)parg)) {
199 199 systrace_sysent[sysnum].stsy_entry = DTRACE_IDNONE;
200 200 #ifdef _SYSCALL32_IMPL
201 201 systrace_sysent32[sysnum].stsy_entry = DTRACE_IDNONE;
202 202 #endif
203 203 } else {
204 204 systrace_sysent[sysnum].stsy_return = DTRACE_IDNONE;
205 205 #ifdef _SYSCALL32_IMPL
206 206 systrace_sysent32[sysnum].stsy_return = DTRACE_IDNONE;
207 207 #endif
208 208 }
209 209 }
210 210
211 211 static dtrace_pattr_t systrace_attr = {
212 212 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
213 213 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
214 214 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
215 215 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
216 216 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
217 217 };
218 218
219 219 static dtrace_pops_t systrace_pops = {
220 220 systrace_provide,
221 221 NULL,
222 222 systrace_enable,
223 223 systrace_disable,
224 224 NULL,
225 225 NULL,
226 226 NULL,
227 227 NULL,
228 228 NULL,
229 229 systrace_destroy
230 230 };
231 231
232 232 static int
233 233 systrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
234 234 {
235 235 switch (cmd) {
236 236 case DDI_ATTACH:
237 237 break;
238 238 case DDI_RESUME:
239 239 return (DDI_SUCCESS);
240 240 default:
241 241 return (DDI_FAILURE);
242 242 }
243 243
244 244 systrace_probe = (void (*)())dtrace_probe;
245 245 membar_enter();
246 246
247 247 if (ddi_create_minor_node(devi, "systrace", S_IFCHR, 0,
248 248 DDI_PSEUDO, NULL) == DDI_FAILURE ||
249 249 dtrace_register("syscall", &systrace_attr, DTRACE_PRIV_USER, NULL,
250 250 &systrace_pops, NULL, &systrace_id) != 0) {
251 251 systrace_probe = systrace_stub;
252 252 ddi_remove_minor_node(devi, NULL);
253 253 return (DDI_FAILURE);
254 254 }
255 255
256 256 ddi_report_dev(devi);
257 257 systrace_devi = devi;
258 258
259 259 return (DDI_SUCCESS);
260 260 }
261 261
262 262 static int
263 263 systrace_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
264 264 {
265 265 switch (cmd) {
266 266 case DDI_DETACH:
267 267 break;
268 268 case DDI_SUSPEND:
269 269 return (DDI_SUCCESS);
270 270 default:
271 271 return (DDI_FAILURE);
272 272 }
273 273
274 274 if (dtrace_unregister(systrace_id) != 0)
275 275 return (DDI_FAILURE);
276 276
277 277 ddi_remove_minor_node(devi, NULL);
278 278 systrace_probe = systrace_stub;
279 279 return (DDI_SUCCESS);
280 280 }
281 281
282 282 /*ARGSUSED*/
283 283 static int
284 284 systrace_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
285 285 {
286 286 int error;
287 287
288 288 switch (infocmd) {
289 289 case DDI_INFO_DEVT2DEVINFO:
290 290 *result = (void *)systrace_devi;
291 291 error = DDI_SUCCESS;
292 292 break;
293 293 case DDI_INFO_DEVT2INSTANCE:
294 294 *result = (void *)0;
295 295 error = DDI_SUCCESS;
296 296 break;
297 297 default:
298 298 error = DDI_FAILURE;
299 299 }
300 300 return (error);
301 301 }
302 302
303 303 /*ARGSUSED*/
304 304 static int
305 305 systrace_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
306 306 {
307 307 return (0);
308 308 }
309 309
310 310 static struct cb_ops systrace_cb_ops = {
311 311 systrace_open, /* open */
312 312 nodev, /* close */
313 313 nulldev, /* strategy */
314 314 nulldev, /* print */
315 315 nodev, /* dump */
316 316 nodev, /* read */
317 317 nodev, /* write */
318 318 nodev, /* ioctl */
319 319 nodev, /* devmap */
320 320 nodev, /* mmap */
321 321 nodev, /* segmap */
322 322 nochpoll, /* poll */
323 323 ddi_prop_op, /* cb_prop_op */
324 324 0, /* streamtab */
325 325 D_NEW | D_MP /* Driver compatibility flag */
326 326 };
327 327
328 328 static struct dev_ops systrace_ops = {
329 329 DEVO_REV, /* devo_rev, */
330 330 0, /* refcnt */
331 331 systrace_info, /* get_dev_info */
332 332 nulldev, /* identify */
333 333 nulldev, /* probe */
334 334 systrace_attach, /* attach */
335 335 systrace_detach, /* detach */
336 336 nodev, /* reset */
337 337 &systrace_cb_ops, /* driver operations */
338 338 NULL, /* bus operations */
339 339 nodev, /* dev power */
340 340 ddi_quiesce_not_needed, /* quiesce */
341 341 };
342 342
343 343 /*
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344 344 * Module linkage information for the kernel.
345 345 */
346 346 static struct modldrv modldrv = {
347 347 &mod_driverops, /* module type (this is a pseudo driver) */
348 348 "System Call Tracing", /* name of module */
349 349 &systrace_ops, /* driver ops */
350 350 };
351 351
352 352 static struct modlinkage modlinkage = {
353 353 MODREV_1,
354 - (void *)&modldrv,
355 - NULL
354 + { (void *)&modldrv, NULL }
356 355 };
357 356
358 357 int
359 358 _init(void)
360 359 {
361 360 return (mod_install(&modlinkage));
362 361 }
363 362
364 363 int
365 364 _info(struct modinfo *modinfop)
366 365 {
367 366 return (mod_info(&modlinkage, modinfop));
368 367 }
369 368
370 369 int
371 370 _fini(void)
372 371 {
373 372 return (mod_remove(&modlinkage));
374 373 }
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