The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/prof_machdep.c

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

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