1 /*-
2 * Copyright (c) 1996 Bruce D. Evans.
3 * 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.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/5.0/sys/i386/isa/prof_machdep.c 99932 2002-07-13 22:28:34Z bde $
27 */
28
29 #ifdef GUPROF
30 #include "opt_i586_guprof.h"
31 #include "opt_perfmon.h"
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/gmon.h>
36 #include <sys/kernel.h>
37 #include <sys/sysctl.h>
38
39 #include <machine/clock.h>
40 #include <machine/perfmon.h>
41 #include <machine/profile.h>
42 #undef MCOUNT
43 #endif
44
45 #include <machine/asmacros.h>
46
47 #ifdef PC98
48 #include <pc98/pc98/pc98.h>
49 #else
50 #include <i386/isa/isa.h>
51 #endif
52 #include <i386/isa/timerreg.h>
53
54 #ifdef GUPROF
55 #define CPUTIME_CLOCK_UNINITIALIZED 0
56 #define CPUTIME_CLOCK_I8254 1
57 #define CPUTIME_CLOCK_TSC 2
58 #define CPUTIME_CLOCK_I586_PMC 3
59 #define CPUTIME_CLOCK_I8254_SHIFT 7
60
61 int cputime_bias = 1; /* initialize for locality of reference */
62
63 static int cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
64 #ifdef I586_PMC_GUPROF
65 static u_int cputime_clock_pmc_conf = I586_PMC_GUPROF;
66 static int cputime_clock_pmc_init;
67 static struct gmonparam saved_gmp;
68 #endif
69 #endif /* GUPROF */
70
71 #ifdef __GNUC__
72 __asm(" \n\
73 GM_STATE = 0 \n\
74 GMON_PROF_OFF = 3 \n\
75 \n\
76 .text \n\
77 .p2align 4,0x90 \n\
78 .globl __mcount \n\
79 .type __mcount,@function \n\
80 __mcount: \n\
81 # \n\
82 # Check that we are profiling. Do it early for speed. \n\
83 # \n\
84 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
85 je .mcount_exit \n\
86 # \n\
87 # __mcount is the same as [.]mcount except the caller \n\
88 # hasn't changed the stack except to call here, so the \n\
89 # caller's raddr is above our raddr. \n\
90 # \n\
91 movl 4(%esp),%edx \n\
92 jmp .got_frompc \n\
93 \n\
94 .p2align 4,0x90 \n\
95 .globl " __XSTRING(HIDENAME(mcount)) " \n\
96 " __XSTRING(HIDENAME(mcount)) ": \n\
97 .globl __cyg_profile_func_enter \n\
98 __cyg_profile_func_enter: \n\
99 cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
100 je .mcount_exit \n\
101 # \n\
102 # The caller's stack frame has already been built, so \n\
103 # %ebp is the caller's frame pointer. The caller's \n\
104 # raddr is in the caller's frame following the caller's \n\
105 # caller's frame pointer. \n\
106 # \n\
107 movl 4(%ebp),%edx \n\
108 .got_frompc: \n\
109 # \n\
110 # Our raddr is the caller's pc. \n\
111 # \n\
112 movl (%esp),%eax \n\
113 \n\
114 pushfl \n\
115 pushl %eax \n\
116 pushl %edx \n\
117 cli \n\
118 call " __XSTRING(CNAME(mcount)) " \n\
119 addl $8,%esp \n\
120 popfl \n\
121 .mcount_exit: \n\
122 ret \n\
123 ");
124 #else /* !__GNUC__ */
125 #error
126 #endif /* __GNUC__ */
127
128 #ifdef GUPROF
129 /*
130 * [.]mexitcount saves the return register(s), loads selfpc and calls
131 * mexitcount(selfpc) to do the work. Someday it should be in a machine
132 * dependent file together with cputime(), __mcount and [.]mcount. cputime()
133 * can't just be put in machdep.c because it has to be compiled without -pg.
134 */
135 #ifdef __GNUC__
136 __asm(" \n\
137 .text \n\
138 # \n\
139 # Dummy label to be seen when gprof -u hides [.]mexitcount. \n\
140 # \n\
141 .p2align 4,0x90 \n\
142 .globl __mexitcount \n\
143 .type __mexitcount,@function \n\
144 __mexitcount: \n\
145 nop \n\
146 \n\
147 GMON_PROF_HIRES = 4 \n\
148 \n\
149 .p2align 4,0x90 \n\
150 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
151 " __XSTRING(HIDENAME(mexitcount)) ": \n\
152 .globl __cyg_profile_func_exit \n\
153 __cyg_profile_func_exit: \n\
154 cmpl $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
155 jne .mexitcount_exit \n\
156 pushl %edx \n\
157 pushl %eax \n\
158 movl 8(%esp),%eax \n\
159 pushfl \n\
160 pushl %eax \n\
161 cli \n\
162 call " __XSTRING(CNAME(mexitcount)) " \n\
163 addl $4,%esp \n\
164 popfl \n\
165 popl %eax \n\
166 popl %edx \n\
167 .mexitcount_exit: \n\
168 ret \n\
169 ");
170 #else /* !__GNUC__ */
171 #error
172 #endif /* __GNUC__ */
173
174 /*
175 * Return the time elapsed since the last call. The units are machine-
176 * dependent.
177 */
178 int
179 cputime()
180 {
181 u_int count;
182 int delta;
183 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
184 defined(PERFMON) && defined(I586_PMC_GUPROF)
185 u_quad_t event_count;
186 #endif
187 u_char high, low;
188 static u_int prev_count;
189
190 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
191 if (cputime_clock == CPUTIME_CLOCK_TSC) {
192 count = (u_int)rdtsc();
193 delta = (int)(count - prev_count);
194 prev_count = count;
195 return (delta);
196 }
197 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
198 if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
199 /*
200 * XXX permon_read() should be inlined so that the
201 * perfmon module doesn't need to be compiled with
202 * profiling disabled and so that it is fast.
203 */
204 perfmon_read(0, &event_count);
205
206 count = (u_int)event_count;
207 delta = (int)(count - prev_count);
208 prev_count = count;
209 return (delta);
210 }
211 #endif /* PERFMON && I586_PMC_GUPROF */
212 #endif /* (I586_CPU || I686_CPU) && !SMP */
213
214 /*
215 * Read the current value of the 8254 timer counter 0.
216 */
217 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
218 low = inb(TIMER_CNTR0);
219 high = inb(TIMER_CNTR0);
220 count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
221
222 /*
223 * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
224 * While profiling is enabled, this routine is called at least twice
225 * per timer reset (for mcounting and mexitcounting hardclock()),
226 * so at most one reset has occurred since the last call, and one
227 * has occurred iff the current count is larger than the previous
228 * count. This allows counter underflow to be detected faster
229 * than in microtime().
230 */
231 delta = prev_count - count;
232 prev_count = count;
233 if ((int) delta <= 0)
234 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
235 return (delta);
236 }
237
238 static int
239 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
240 {
241 int clock;
242 int error;
243 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
244 int event;
245 struct pmc pmc;
246 #endif
247
248 clock = cputime_clock;
249 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
250 if (clock == CPUTIME_CLOCK_I586_PMC) {
251 pmc.pmc_val = cputime_clock_pmc_conf;
252 clock += pmc.pmc_event;
253 }
254 #endif
255 error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
256 if (error == 0 && req->newptr != NULL) {
257 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
258 if (clock >= CPUTIME_CLOCK_I586_PMC) {
259 event = clock - CPUTIME_CLOCK_I586_PMC;
260 if (event >= 256)
261 return (EINVAL);
262 pmc.pmc_num = 0;
263 pmc.pmc_event = event;
264 pmc.pmc_unit = 0;
265 pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
266 pmc.pmc_mask = 0;
267 cputime_clock_pmc_conf = pmc.pmc_val;
268 cputime_clock = CPUTIME_CLOCK_I586_PMC;
269 } else
270 #endif
271 {
272 if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
273 return (EINVAL);
274 cputime_clock = clock;
275 }
276 }
277 return (error);
278 }
279
280 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
281 0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
282
283 /*
284 * The start and stop routines need not be here since we turn off profiling
285 * before calling them. They are here for convenience.
286 */
287
288 void
289 startguprof(gp)
290 struct gmonparam *gp;
291 {
292 if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
293 cputime_clock = CPUTIME_CLOCK_I8254;
294 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
295 if (tsc_freq != 0)
296 cputime_clock = CPUTIME_CLOCK_TSC;
297 #endif
298 }
299 gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
300 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
301 if (cputime_clock == CPUTIME_CLOCK_TSC)
302 gp->profrate = tsc_freq;
303 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
304 else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
305 if (perfmon_avail() &&
306 perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
307 if (perfmon_start(0) != 0)
308 perfmon_fini(0);
309 else {
310 /* XXX 1 event == 1 us. */
311 gp->profrate = 1000000;
312
313 saved_gmp = *gp;
314
315 /* Zap overheads. They are invalid. */
316 gp->cputime_overhead = 0;
317 gp->mcount_overhead = 0;
318 gp->mcount_post_overhead = 0;
319 gp->mcount_pre_overhead = 0;
320 gp->mexitcount_overhead = 0;
321 gp->mexitcount_post_overhead = 0;
322 gp->mexitcount_pre_overhead = 0;
323
324 cputime_clock_pmc_init = TRUE;
325 }
326 }
327 }
328 #endif /* PERFMON && I586_PMC_GUPROF */
329 #endif /* (I586_CPU || I686_CPU) && !SMP */
330 cputime_bias = 0;
331 cputime();
332 }
333
334 void
335 stopguprof(gp)
336 struct gmonparam *gp;
337 {
338 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
339 if (cputime_clock_pmc_init) {
340 *gp = saved_gmp;
341 perfmon_fini(0);
342 cputime_clock_pmc_init = FALSE;
343 }
344 #endif
345 }
346
347 #else /* !GUPROF */
348 #ifdef __GNUC__
349 __asm(" \n\
350 .text \n\
351 .p2align 4,0x90 \n\
352 .globl " __XSTRING(HIDENAME(mexitcount)) " \n\
353 " __XSTRING(HIDENAME(mexitcount)) ": \n\
354 ret \n\
355 ");
356 #else /* !__GNUC__ */
357 #error
358 #endif /* __GNUC__ */
359 #endif /* GUPROF */
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