sys/platform/pc32/isa/prof_machdep.c

   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: src/sys/i386/isa/prof_machdep.c,v 1.14.2.1 2000/08/03 00:09:30 ps Exp $
  27  * $DragonFly: src/sys/platform/pc32/isa/prof_machdep.c,v 1.2 2003/06/17 04:28:37 dillon Exp $
  28  */
  29
  30 #ifdef GUPROF
  31 #include "opt_i586_guprof.h"
  32 #include "opt_perfmon.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/gmon.h>
  37 #include <sys/kernel.h>
  38 #include <sys/sysctl.h>
  39
  40 #include <machine/clock.h>
  41 #include <machine/perfmon.h>
  42 #include <machine/profile.h>
  43 #undef MCOUNT
  44 #endif
  45
  46 #include <machine/asmacros.h>
  47
  48 #ifdef PC98
  49 #include <pc98/pc98/pc98.h>
  50 #else
  51 #include <i386/isa/isa.h>
  52 #endif
  53 #include <i386/isa/timerreg.h>
  54
  55 #ifdef GUPROF
  56 #define CPUTIME_CLOCK_UNINITIALIZED     0
  57 #define CPUTIME_CLOCK_I8254             1
  58 #define CPUTIME_CLOCK_TSC               2
  59 #define CPUTIME_CLOCK_I586_PMC          3
  60 #define CPUTIME_CLOCK_I8254_SHIFT       7
  61
  62 int     cputime_bias = 1;       /* initialize for locality of reference */
  63
  64 static int      cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
  65 #ifdef I586_PMC_GUPROF
  66 static u_int    cputime_clock_pmc_conf = I586_PMC_GUPROF;
  67 static int      cputime_clock_pmc_init;
  68 static struct gmonparam saved_gmp;
  69 #endif
  70 #endif /* GUPROF */
  71
  72 #ifdef __GNUC__
  73 __asm("                                                         \n\
  74 GM_STATE        =       0                                       \n\
  75 GMON_PROF_OFF   =       3                                       \n\
  76                                                                 \n\
  77         .text                                                   \n\
  78         .p2align 4,0x90                                         \n\
  79         .globl  __mcount                                        \n\
  80         .type   __mcount,@function                              \n\
  81 __mcount:                                                       \n\
  82         #                                                       \n\
  83         # Check that we are profiling.  Do it early for speed.  \n\
  84         #                                                       \n\
  85         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  86         je      .mcount_exit                                    \n\
  87         #                                                       \n\
  88         # __mcount is the same as [.]mcount except the caller   \n\
  89         # hasn't changed the stack except to call here, so the  \n\
  90         # caller's raddr is above our raddr.                    \n\
  91         #                                                       \n\
  92         movl    4(%esp),%edx                                    \n\
  93         jmp     .got_frompc                                     \n\
  94                                                                 \n\
  95         .p2align 4,0x90                                         \n\
  96         .globl  " __XSTRING(HIDENAME(mcount)) "                 \n\
  97 " __XSTRING(HIDENAME(mcount)) ":                                \n\
  98         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  99         je      .mcount_exit                                    \n\
 100         #                                                       \n\
 101         # The caller's stack frame has already been built, so   \n\
 102         # %ebp is the caller's frame pointer.  The caller's     \n\
 103         # raddr is in the caller's frame following the caller's \n\
 104         # caller's frame pointer.                               \n\
 105         #                                                       \n\
 106         movl    4(%ebp),%edx                                    \n\
 107 .got_frompc:                                                    \n\
 108         #                                                       \n\
 109         # Our raddr is the caller's pc.                         \n\
 110         #                                                       \n\
 111         movl    (%esp),%eax                                     \n\
 112                                                                 \n\
 113         pushfl                                                  \n\
 114         pushl   %eax                                            \n\
 115         pushl   %edx                                            \n\
 116         cli                                                     \n\
 117         call    " __XSTRING(CNAME(mcount)) "                    \n\
 118         addl    $8,%esp                                         \n\
 119         popfl                                                   \n\
 120 .mcount_exit:                                                   \n\
 121         ret                                                     \n\
 122 ");
 123 #else /* !__GNUC__ */
 124 #error
 125 #endif /* __GNUC__ */
 126
 127 #ifdef GUPROF
 128 /*
 129  * [.]mexitcount saves the return register(s), loads selfpc and calls
 130  * mexitcount(selfpc) to do the work.  Someday it should be in a machine
 131  * dependent file together with cputime(), __mcount and [.]mcount.  cputime()
 132  * can't just be put in machdep.c because it has to be compiled without -pg.
 133  */
 134 #ifdef __GNUC__
 135 __asm("                                                         \n\
 136         .text                                                   \n\
 137 #                                                               \n\
 138 # Dummy label to be seen when gprof -u hides [.]mexitcount.     \n\
 139 #                                                               \n\
 140         .p2align 4,0x90                                         \n\
 141         .globl  __mexitcount                                    \n\
 142         .type   __mexitcount,@function                          \n\
 143 __mexitcount:                                                   \n\
 144         nop                                                     \n\
 145                                                                 \n\
 146 GMON_PROF_HIRES =       4                                       \n\
 147                                                                 \n\
 148         .p2align 4,0x90                                         \n\
 149         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
 150 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
 151         cmpl    $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
 152         jne     .mexitcount_exit                                \n\
 153         pushl   %edx                                            \n\
 154         pushl   %eax                                            \n\
 155         movl    8(%esp),%eax                                    \n\
 156         pushfl                                                  \n\
 157         pushl   %eax                                            \n\
 158         cli                                                     \n\
 159         call    " __XSTRING(CNAME(mexitcount)) "                \n\
 160         addl    $4,%esp                                         \n\
 161         popfl                                                   \n\
 162         popl    %eax                                            \n\
 163         popl    %edx                                            \n\
 164 .mexitcount_exit:                                               \n\
 165         ret                                                     \n\
 166 ");
 167 #else /* !__GNUC__ */
 168 #error
 169 #endif /* __GNUC__ */
 170
 171 /*
 172  * Return the time elapsed since the last call.  The units are machine-
 173  * dependent.
 174  */
 175 int
 176 cputime()
 177 {
 178         u_int count;
 179         int delta;
 180 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
 181     defined(PERFMON) && defined(I586_PMC_GUPROF)
 182         u_quad_t event_count;
 183 #endif
 184         u_char high, low;
 185         static u_int prev_count;
 186
 187 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
 188         if (cputime_clock == CPUTIME_CLOCK_TSC) {
 189                 count = (u_int)rdtsc();
 190                 delta = (int)(count - prev_count);
 191                 prev_count = count;
 192                 return (delta);
 193         }
 194 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 195         if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
 196                 /*
 197                  * XXX permon_read() should be inlined so that the
 198                  * perfmon module doesn't need to be compiled with
 199                  * profiling disabled and so that it is fast.
 200                  */
 201                 perfmon_read(0, &event_count);
 202
 203                 count = (u_int)event_count;
 204                 delta = (int)(count - prev_count);
 205                 prev_count = count;
 206                 return (delta);
 207         }
 208 #endif /* PERFMON && I586_PMC_GUPROF */
 209 #endif /* (I586_CPU || I686_CPU) && !SMP */
 210
 211         /*
 212          * Read the current value of the 8254 timer counter 0.
 213          */
 214         outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
 215         low = inb(TIMER_CNTR0);
 216         high = inb(TIMER_CNTR0);
 217         count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
 218
 219         /*
 220          * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
 221          * While profiling is enabled, this routine is called at least twice
 222          * per timer reset (for mcounting and mexitcounting hardclock()),
 223          * so at most one reset has occurred since the last call, and one
 224          * has occurred iff the current count is larger than the previous
 225          * count.  This allows counter underflow to be detected faster
 226          * than in microtime().
 227          */
 228         delta = prev_count - count;
 229         prev_count = count;
 230         if ((int) delta <= 0)
 231                 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
 232         return (delta);
 233 }
 234
 235 static int
 236 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
 237 {
 238         int clock;
 239         int error;
 240 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 241         int event;
 242         struct pmc pmc;
 243 #endif
 244
 245         clock = cputime_clock;
 246 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 247         if (clock == CPUTIME_CLOCK_I586_PMC) {
 248                 pmc.pmc_val = cputime_clock_pmc_conf;
 249                 clock += pmc.pmc_event;
 250         }
 251 #endif
 252         error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
 253         if (error == 0 && req->newptr != NULL) {
 254 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 255                 if (clock >= CPUTIME_CLOCK_I586_PMC) {
 256                         event = clock - CPUTIME_CLOCK_I586_PMC;
 257                         if (event >= 256)
 258                                 return (EINVAL);
 259                         pmc.pmc_num = 0;
 260                         pmc.pmc_event = event;
 261                         pmc.pmc_unit = 0;
 262                         pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
 263                         pmc.pmc_mask = 0;
 264                         cputime_clock_pmc_conf = pmc.pmc_val;
 265                         cputime_clock = CPUTIME_CLOCK_I586_PMC;
 266                 } else
 267 #endif
 268                 {
 269                         if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
 270                                 return (EINVAL);
 271                         cputime_clock = clock;
 272                 }
 273         }
 274         return (error);
 275 }
 276
 277 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
 278             0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
 279
 280 /*
 281  * The start and stop routines need not be here since we turn off profiling
 282  * before calling them.  They are here for convenience.
 283  */
 284
 285 void
 286 startguprof(gp)
 287         struct gmonparam *gp;
 288 {
 289         if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
 290                 cputime_clock = CPUTIME_CLOCK_I8254;
 291 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
 292                 if (tsc_freq != 0)
 293                         cputime_clock = CPUTIME_CLOCK_TSC;
 294 #endif
 295         }
 296         gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
 297 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
 298         if (cputime_clock == CPUTIME_CLOCK_TSC)
 299                 gp->profrate = tsc_freq;
 300 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 301         else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
 302                 if (perfmon_avail() &&
 303                     perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
 304                         if (perfmon_start(0) != 0)
 305                                 perfmon_fini(0);
 306                         else {
 307                                 /* XXX 1 event == 1 us. */
 308                                 gp->profrate = 1000000;
 309
 310                                 saved_gmp = *gp;
 311
 312                                 /* Zap overheads.  They are invalid. */
 313                                 gp->cputime_overhead = 0;
 314                                 gp->mcount_overhead = 0;
 315                                 gp->mcount_post_overhead = 0;
 316                                 gp->mcount_pre_overhead = 0;
 317                                 gp->mexitcount_overhead = 0;
 318                                 gp->mexitcount_post_overhead = 0;
 319                                 gp->mexitcount_pre_overhead = 0;
 320
 321                                 cputime_clock_pmc_init = TRUE;
 322                         }
 323                 }
 324         }
 325 #endif /* PERFMON && I586_PMC_GUPROF */
 326 #endif /* (I586_CPU || I686_CPU) && !SMP */
 327         cputime_bias = 0;
 328         cputime();
 329 }
 330
 331 void
 332 stopguprof(gp)
 333         struct gmonparam *gp;
 334 {
 335 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 336         if (cputime_clock_pmc_init) {
 337                 *gp = saved_gmp;
 338                 perfmon_fini(0);
 339                 cputime_clock_pmc_init = FALSE;
 340         }
 341 #endif
 342 }
 343
 344 #else /* !GUPROF */
 345 #ifdef __GNUC__
 346 __asm("                                                         \n\
 347         .text                                                   \n\
 348         .p2align 4,0x90                                         \n\
 349         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
 350 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
 351         ret                                                     \n\
 352 ");
 353 #else /* !__GNUC__ */
 354 #error
 355 #endif /* __GNUC__ */
 356 #endif /* GUPROF */