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11c981a9 RM |
1 | /*- |
2 | * Copyright (c) 1983, 1992, 1993 | |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
11c981a9 RM |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
11c981a9 RM |
29 | #include <sys/param.h> |
30 | #include <sys/time.h> | |
31 | #include <sys/gmon.h> | |
b20e47cb | 32 | #include <sys/gmon_out.h> |
5ae9d168 | 33 | #include <sys/uio.h> |
11c981a9 | 34 | |
3996f34b | 35 | #include <errno.h> |
11c981a9 RM |
36 | #include <stdio.h> |
37 | #include <fcntl.h> | |
b20e47cb RM |
38 | #include <unistd.h> |
39 | ||
40 | #include <stdio.h> | |
11c981a9 RM |
41 | #include <stdlib.h> |
42 | #include <string.h> | |
43 | #include <unistd.h> | |
66539a73 | 44 | #include <libc-internal.h> |
fbb37d25 | 45 | #include <not-cancel.h> |
d68171ed | 46 | |
8dcc6a3f UD |
47 | #ifdef USE_IN_LIBIO |
48 | # include <wchar.h> | |
49 | #endif | |
50 | ||
100351c3 UD |
51 | /* Head of basic-block list or NULL. */ |
52 | struct __bb *__bb_head attribute_hidden; | |
b20e47cb | 53 | |
0e47dbd0 | 54 | struct gmonparam _gmonparam attribute_hidden = { GMON_PROF_OFF }; |
11c981a9 | 55 | |
b20e47cb RM |
56 | /* |
57 | * See profil(2) where this is described: | |
58 | */ | |
11c981a9 | 59 | static int s_scale; |
11c981a9 RM |
60 | #define SCALE_1_TO_1 0x10000L |
61 | ||
fbb37d25 | 62 | #define ERR(s) write_not_cancel (STDERR_FILENO, s, sizeof (s) - 1) |
b20e47cb | 63 | |
79937577 UD |
64 | void moncontrol (int mode); |
65 | void __moncontrol (int mode); | |
66 | static void write_hist (int fd) internal_function; | |
67 | static void write_call_graph (int fd) internal_function; | |
68 | static void write_bb_counts (int fd) internal_function; | |
11336c16 | 69 | |
b20e47cb RM |
70 | /* |
71 | * Control profiling | |
72 | * profiling is what mcount checks to see if | |
73 | * all the data structures are ready. | |
74 | */ | |
75 | void | |
3996f34b | 76 | __moncontrol (mode) |
a68b0d31 | 77 | int mode; |
b20e47cb RM |
78 | { |
79 | struct gmonparam *p = &_gmonparam; | |
80 | ||
14e9dd67 UD |
81 | /* Don't change the state if we ran into an error. */ |
82 | if (p->state == GMON_PROF_ERROR) | |
83 | return; | |
84 | ||
b20e47cb RM |
85 | if (mode) |
86 | { | |
87 | /* start */ | |
9a0a462c | 88 | __profil((void *) p->kcount, p->kcountsize, p->lowpc, s_scale); |
b20e47cb RM |
89 | p->state = GMON_PROF_ON; |
90 | } | |
91 | else | |
92 | { | |
93 | /* stop */ | |
9a0a462c | 94 | __profil(NULL, 0, 0, 0); |
b20e47cb RM |
95 | p->state = GMON_PROF_OFF; |
96 | } | |
97 | } | |
69173865 | 98 | weak_alias (__moncontrol, moncontrol) |
11c981a9 | 99 | |
11c981a9 RM |
100 | |
101 | void | |
3996f34b | 102 | __monstartup (lowpc, highpc) |
a68b0d31 UD |
103 | u_long lowpc; |
104 | u_long highpc; | |
11c981a9 | 105 | { |
b20e47cb RM |
106 | register int o; |
107 | char *cp; | |
108 | struct gmonparam *p = &_gmonparam; | |
109 | ||
110 | /* | |
111 | * round lowpc and highpc to multiples of the density we're using | |
112 | * so the rest of the scaling (here and in gprof) stays in ints. | |
113 | */ | |
114 | p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); | |
115 | p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); | |
116 | p->textsize = p->highpc - p->lowpc; | |
69ac9d07 | 117 | p->kcountsize = ROUNDUP(p->textsize / HISTFRACTION, sizeof(*p->froms)); |
b20e47cb RM |
118 | p->hashfraction = HASHFRACTION; |
119 | p->log_hashfraction = -1; | |
9a0a462c UD |
120 | /* The following test must be kept in sync with the corresponding |
121 | test in mcount.c. */ | |
b20e47cb RM |
122 | if ((HASHFRACTION & (HASHFRACTION - 1)) == 0) { |
123 | /* if HASHFRACTION is a power of two, mcount can use shifting | |
124 | instead of integer division. Precompute shift amount. */ | |
125 | p->log_hashfraction = ffs(p->hashfraction * sizeof(*p->froms)) - 1; | |
126 | } | |
127 | p->fromssize = p->textsize / HASHFRACTION; | |
128 | p->tolimit = p->textsize * ARCDENSITY / 100; | |
129 | if (p->tolimit < MINARCS) | |
130 | p->tolimit = MINARCS; | |
131 | else if (p->tolimit > MAXARCS) | |
132 | p->tolimit = MAXARCS; | |
133 | p->tossize = p->tolimit * sizeof(struct tostruct); | |
11c981a9 | 134 | |
0413b54c | 135 | cp = calloc (p->kcountsize + p->fromssize + p->tossize, 1); |
b20e47cb RM |
136 | if (! cp) |
137 | { | |
14e9dd67 UD |
138 | ERR("monstartup: out of memory\n"); |
139 | p->tos = NULL; | |
140 | p->state = GMON_PROF_ERROR; | |
b20e47cb RM |
141 | return; |
142 | } | |
b20e47cb RM |
143 | p->tos = (struct tostruct *)cp; |
144 | cp += p->tossize; | |
be5b0fbc | 145 | p->kcount = (HISTCOUNTER *)cp; |
b20e47cb | 146 | cp += p->kcountsize; |
be5b0fbc | 147 | p->froms = (ARCINDEX *)cp; |
11c981a9 | 148 | |
b20e47cb RM |
149 | p->tos[0].link = 0; |
150 | ||
151 | o = p->highpc - p->lowpc; | |
d68171ed | 152 | if (p->kcountsize < (u_long) o) |
b20e47cb | 153 | { |
11c981a9 | 154 | #ifndef hp300 |
b20e47cb RM |
155 | s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; |
156 | #else | |
157 | /* avoid floating point operations */ | |
158 | int quot = o / p->kcountsize; | |
159 | ||
160 | if (quot >= 0x10000) | |
161 | s_scale = 1; | |
162 | else if (quot >= 0x100) | |
163 | s_scale = 0x10000 / quot; | |
164 | else if (o >= 0x800000) | |
165 | s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); | |
166 | else | |
167 | s_scale = 0x1000000 / ((o << 8) / p->kcountsize); | |
11c981a9 | 168 | #endif |
b20e47cb RM |
169 | } else |
170 | s_scale = SCALE_1_TO_1; | |
11c981a9 | 171 | |
3996f34b | 172 | __moncontrol(1); |
11c981a9 | 173 | } |
0ecb606c | 174 | weak_alias (__monstartup, monstartup) |
11c981a9 | 175 | |
b20e47cb RM |
176 | |
177 | static void | |
dfd2257a | 178 | internal_function |
a68b0d31 UD |
179 | write_hist (fd) |
180 | int fd; | |
11c981a9 | 181 | { |
5ae9d168 UD |
182 | u_char tag = GMON_TAG_TIME_HIST; |
183 | struct gmon_hist_hdr thdr __attribute__ ((aligned (__alignof__ (char *)))); | |
11c981a9 | 184 | |
b20e47cb RM |
185 | if (_gmonparam.kcountsize > 0) |
186 | { | |
5ae9d168 UD |
187 | struct iovec iov[3] = |
188 | { | |
189 | { &tag, sizeof (tag) }, | |
190 | { &thdr, sizeof (struct gmon_hist_hdr) }, | |
191 | { _gmonparam.kcount, _gmonparam.kcountsize } | |
192 | }; | |
193 | ||
194 | *(char **) thdr.low_pc = (char *) _gmonparam.lowpc; | |
195 | *(char **) thdr.high_pc = (char *) _gmonparam.highpc; | |
3996f34b UD |
196 | *(int32_t *) thdr.hist_size = (_gmonparam.kcountsize |
197 | / sizeof (HISTCOUNTER)); | |
198 | *(int32_t *) thdr.prof_rate = __profile_frequency (); | |
5ae9d168 | 199 | strncpy (thdr.dimen, "seconds", sizeof (thdr.dimen)); |
b20e47cb | 200 | thdr.dimen_abbrev = 's'; |
11c981a9 | 201 | |
fbb37d25 | 202 | writev_not_cancel_no_status (fd, iov, 3); |
b20e47cb | 203 | } |
11c981a9 RM |
204 | } |
205 | ||
b20e47cb RM |
206 | |
207 | static void | |
dfd2257a | 208 | internal_function |
a68b0d31 UD |
209 | write_call_graph (fd) |
210 | int fd; | |
11c981a9 | 211 | { |
e7fd8a39 | 212 | #define NARCS_PER_WRITEV 32 |
5ae9d168 | 213 | u_char tag = GMON_TAG_CG_ARC; |
e7fd8a39 | 214 | struct gmon_cg_arc_record raw_arc[NARCS_PER_WRITEV] |
5ae9d168 | 215 | __attribute__ ((aligned (__alignof__ (char*)))); |
be5b0fbc | 216 | ARCINDEX from_index, to_index; |
eb64f8cb | 217 | u_long from_len; |
b20e47cb | 218 | u_long frompc; |
e7fd8a39 UD |
219 | struct iovec iov[2 * NARCS_PER_WRITEV]; |
220 | int nfilled; | |
b20e47cb | 221 | |
e7fd8a39 | 222 | for (nfilled = 0; nfilled < NARCS_PER_WRITEV; ++nfilled) |
5ae9d168 | 223 | { |
e7fd8a39 UD |
224 | iov[2 * nfilled].iov_base = &tag; |
225 | iov[2 * nfilled].iov_len = sizeof (tag); | |
5ae9d168 | 226 | |
e7fd8a39 UD |
227 | iov[2 * nfilled + 1].iov_base = &raw_arc[nfilled]; |
228 | iov[2 * nfilled + 1].iov_len = sizeof (struct gmon_cg_arc_record); | |
229 | } | |
230 | ||
231 | nfilled = 0; | |
5ae9d168 | 232 | from_len = _gmonparam.fromssize / sizeof (*_gmonparam.froms); |
b20e47cb RM |
233 | for (from_index = 0; from_index < from_len; ++from_index) |
234 | { | |
235 | if (_gmonparam.froms[from_index] == 0) | |
236 | continue; | |
237 | ||
238 | frompc = _gmonparam.lowpc; | |
239 | frompc += (from_index * _gmonparam.hashfraction | |
5ae9d168 | 240 | * sizeof (*_gmonparam.froms)); |
b20e47cb RM |
241 | for (to_index = _gmonparam.froms[from_index]; |
242 | to_index != 0; | |
243 | to_index = _gmonparam.tos[to_index].link) | |
244 | { | |
328c5f65 UD |
245 | struct arc |
246 | { | |
247 | char *frompc; | |
248 | char *selfpc; | |
249 | int32_t count; | |
250 | } | |
251 | arc; | |
252 | ||
253 | arc.frompc = (char *) frompc; | |
254 | arc.selfpc = (char *) _gmonparam.tos[to_index].selfpc; | |
255 | arc.count = _gmonparam.tos[to_index].count; | |
256 | memcpy (raw_arc + nfilled, &arc, sizeof (raw_arc [0])); | |
e7fd8a39 UD |
257 | |
258 | if (++nfilled == NARCS_PER_WRITEV) | |
3e5f5557 | 259 | { |
fbb37d25 | 260 | writev_not_cancel_no_status (fd, iov, 2 * nfilled); |
3e5f5557 UD |
261 | nfilled = 0; |
262 | } | |
11c981a9 | 263 | } |
b20e47cb | 264 | } |
e7fd8a39 | 265 | if (nfilled > 0) |
fbb37d25 | 266 | writev_not_cancel_no_status (fd, iov, 2 * nfilled); |
11c981a9 RM |
267 | } |
268 | ||
b20e47cb RM |
269 | |
270 | static void | |
dfd2257a | 271 | internal_function |
a68b0d31 UD |
272 | write_bb_counts (fd) |
273 | int fd; | |
11c981a9 | 274 | { |
b20e47cb | 275 | struct __bb *grp; |
5ae9d168 | 276 | u_char tag = GMON_TAG_BB_COUNT; |
3e5f5557 UD |
277 | size_t ncounts; |
278 | size_t i; | |
b20e47cb | 279 | |
5ae9d168 UD |
280 | struct iovec bbhead[2] = |
281 | { | |
282 | { &tag, sizeof (tag) }, | |
283 | { &ncounts, sizeof (ncounts) } | |
284 | }; | |
3e5f5557 UD |
285 | struct iovec bbbody[8]; |
286 | size_t nfilled; | |
5ae9d168 | 287 | |
3e5f5557 UD |
288 | for (i = 0; i < (sizeof (bbbody) / sizeof (bbbody[0])); i += 2) |
289 | { | |
290 | bbbody[i].iov_len = sizeof (grp->addresses[0]); | |
291 | bbbody[i + 1].iov_len = sizeof (grp->counts[0]); | |
292 | } | |
5ae9d168 | 293 | |
b20e47cb RM |
294 | /* Write each group of basic-block info (all basic-blocks in a |
295 | compilation unit form a single group). */ | |
296 | ||
297 | for (grp = __bb_head; grp; grp = grp->next) | |
298 | { | |
299 | ncounts = grp->ncounts; | |
fbb37d25 | 300 | writev_not_cancel_no_status (fd, bbhead, 2); |
e7fd8a39 | 301 | for (nfilled = i = 0; i < ncounts; ++i) |
b20e47cb | 302 | { |
3e5f5557 UD |
303 | if (nfilled > (sizeof (bbbody) / sizeof (bbbody[0])) - 2) |
304 | { | |
fbb37d25 | 305 | writev_not_cancel_no_status (fd, bbbody, nfilled); |
3e5f5557 UD |
306 | nfilled = 0; |
307 | } | |
308 | ||
309 | bbbody[nfilled++].iov_base = (char *) &grp->addresses[i]; | |
310 | bbbody[nfilled++].iov_base = &grp->counts[i]; | |
b20e47cb | 311 | } |
e7fd8a39 | 312 | if (nfilled > 0) |
fbb37d25 | 313 | writev_not_cancel_no_status (fd, bbbody, nfilled); |
b20e47cb | 314 | } |
11c981a9 RM |
315 | } |
316 | ||
317 | ||
0413b54c UD |
318 | static void |
319 | write_gmon (void) | |
b20e47cb | 320 | { |
5ae9d168 | 321 | struct gmon_hdr ghdr __attribute__ ((aligned (__alignof__ (int)))); |
14c44e2e UD |
322 | int fd = -1; |
323 | char *env; | |
b20e47cb | 324 | |
b7eb7b0f UD |
325 | #ifndef O_NOFOLLOW |
326 | # define O_NOFOLLOW 0 | |
327 | #endif | |
328 | ||
14c44e2e UD |
329 | env = getenv ("GMON_OUT_PREFIX"); |
330 | if (env != NULL && !__libc_enable_secure) | |
b20e47cb | 331 | { |
14c44e2e UD |
332 | size_t len = strlen (env); |
333 | char buf[len + 20]; | |
0ecb606c | 334 | __snprintf (buf, sizeof (buf), "%s.%u", env, __getpid ()); |
fbb37d25 | 335 | fd = open_not_cancel (buf, O_CREAT|O_TRUNC|O_WRONLY|O_NOFOLLOW, 0666); |
14c44e2e UD |
336 | } |
337 | ||
338 | if (fd == -1) | |
339 | { | |
fbb37d25 UD |
340 | fd = open_not_cancel ("gmon.out", O_CREAT|O_TRUNC|O_WRONLY|O_NOFOLLOW, |
341 | 0666); | |
14c44e2e UD |
342 | if (fd < 0) |
343 | { | |
344 | char buf[300]; | |
345 | int errnum = errno; | |
0ecb606c JJ |
346 | __fxprintf (NULL, "_mcleanup: gmon.out: %s\n", |
347 | __strerror_r (errnum, buf, sizeof buf)); | |
14c44e2e UD |
348 | return; |
349 | } | |
b20e47cb RM |
350 | } |
351 | ||
352 | /* write gmon.out header: */ | |
3996f34b | 353 | memset (&ghdr, '\0', sizeof (struct gmon_hdr)); |
5ae9d168 | 354 | memcpy (&ghdr.cookie[0], GMON_MAGIC, sizeof (ghdr.cookie)); |
3996f34b | 355 | *(int32_t *) ghdr.version = GMON_VERSION; |
fbb37d25 | 356 | write_not_cancel (fd, &ghdr, sizeof (struct gmon_hdr)); |
b20e47cb RM |
357 | |
358 | /* write PC histogram: */ | |
5ae9d168 | 359 | write_hist (fd); |
b20e47cb RM |
360 | |
361 | /* write call-graph: */ | |
5ae9d168 | 362 | write_call_graph (fd); |
b20e47cb RM |
363 | |
364 | /* write basic-block execution counts: */ | |
5ae9d168 | 365 | write_bb_counts (fd); |
b20e47cb | 366 | |
fbb37d25 | 367 | close_not_cancel_no_status (fd); |
0413b54c UD |
368 | } |
369 | ||
370 | ||
371 | void | |
372 | __write_profiling (void) | |
373 | { | |
374 | int save = _gmonparam.state; | |
375 | _gmonparam.state = GMON_PROF_OFF; | |
376 | if (save == GMON_PROF_ON) | |
377 | write_gmon (); | |
378 | _gmonparam.state = save; | |
379 | } | |
f5bf21a7 UD |
380 | #ifndef SHARED |
381 | /* This symbol isn't used anywhere in the DSO and it is not exported. | |
382 | This would normally mean it should be removed to get the same API | |
383 | in static libraries. But since profiling is special in static libs | |
384 | anyway we keep it. But not when building the DSO since some | |
385 | quality assurance tests will otherwise trigger. */ | |
0413b54c | 386 | weak_alias (__write_profiling, write_profiling) |
f5bf21a7 | 387 | #endif |
0413b54c UD |
388 | |
389 | ||
390 | void | |
391 | _mcleanup (void) | |
392 | { | |
14e9dd67 | 393 | __moncontrol (0); |
0413b54c | 394 | |
14e9dd67 | 395 | if (_gmonparam.state != GMON_PROF_ERROR) |
0413b54c UD |
396 | write_gmon (); |
397 | ||
14e9dd67 UD |
398 | /* free the memory. */ |
399 | if (_gmonparam.tos != NULL) | |
ebbad4cc | 400 | free (_gmonparam.tos); |
b20e47cb | 401 | } |