The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/5.4/sys/amd64/amd64/prof_machdep.c 145335 2005-04-20 19:11:07Z cvs2svn $");
   29 
   30 #ifdef GUPROF
   31 #if 0
   32 #include "opt_i586_guprof.h"
   33 #include "opt_perfmon.h"
   34 #endif
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/gmon.h>
   39 #include <sys/kernel.h>
   40 #include <sys/sysctl.h>
   41 
   42 #include <machine/clock.h>
   43 #if 0
   44 #include <machine/perfmon.h>
   45 #endif
   46 #include <machine/profile.h>
   47 #undef MCOUNT
   48 #endif
   49 
   50 #include <machine/asmacros.h>
   51 
   52 #include <i386/isa/isa.h>
   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 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   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         pushq   %rax                                            \n\
   93         pushq   %rdx                                            \n\
   94         pushq   %rcx                                            \n\
   95         pushq   %rsi                                            \n\
   96         pushq   %rdi                                            \n\
   97         pushq   %r8                                             \n\
   98         pushq   %r9                                             \n\
   99         movq    7*8+8(%rsp),%rdi                                \n\
  100         jmp     .got_frompc                                     \n\
  101                                                                 \n\
  102         .p2align 4,0x90                                         \n\
  103         .globl  " __XSTRING(HIDENAME(mcount)) "                 \n\
  104 " __XSTRING(HIDENAME(mcount)) ":                                \n\
  105         .globl  __cyg_profile_func_enter                        \n\
  106 __cyg_profile_func_enter:                                       \n\
  107         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  108         je      .mcount_exit                                    \n\
  109         #                                                       \n\
  110         # The caller's stack frame has already been built, so   \n\
  111         # %rbp is the caller's frame pointer.  The caller's     \n\
  112         # raddr is in the caller's frame following the caller's \n\
  113         # caller's frame pointer.                               \n\
  114         #                                                       \n\
  115         pushq   %rax                                            \n\
  116         pushq   %rdx                                            \n\
  117         pushq   %rcx                                            \n\
  118         pushq   %rsi                                            \n\
  119         pushq   %rdi                                            \n\
  120         pushq   %r8                                             \n\
  121         pushq   %r9                                             \n\
  122         movq    8(%rbp),%rdi                                    \n\
  123 .got_frompc:                                                    \n\
  124         #                                                       \n\
  125         # Our raddr is the caller's pc.                         \n\
  126         #                                                       \n\
  127         movq    7*8(%rsp),%rsi                                  \n\
  128                                                                 \n\
  129         pushfq                                                  \n\
  130         cli                                                     \n\
  131         call    " __XSTRING(CNAME(mcount)) "                    \n\
  132         popfq                                                   \n\
  133         popq    %r9                                             \n\
  134         popq    %r8                                             \n\
  135         popq    %rdi                                            \n\
  136         popq    %rsi                                            \n\
  137         popq    %rcx                                            \n\
  138         popq    %rdx                                            \n\
  139         popq    %rax                                            \n\
  140 .mcount_exit:                                                   \n\
  141         ret                                                     \n\
  142 ");
  143 #else /* !(__GNUC__ || __INTEL_COMPILER) */
  144 #error
  145 #endif /* __GNUC__ || __INTEL_COMPILER */
  146 
  147 #ifdef GUPROF
  148 /*
  149  * [.]mexitcount saves the return register(s), loads selfpc and calls
  150  * mexitcount(selfpc) to do the work.  Someday it should be in a machine
  151  * dependent file together with cputime(), __mcount and [.]mcount.  cputime()
  152  * can't just be put in machdep.c because it has to be compiled without -pg.
  153  */
  154 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  155 __asm("                                                         \n\
  156         .text                                                   \n\
  157 #                                                               \n\
  158 # Dummy label to be seen when gprof -u hides [.]mexitcount.     \n\
  159 #                                                               \n\
  160         .p2align 4,0x90                                         \n\
  161         .globl  __mexitcount                                    \n\
  162         .type   __mexitcount,@function                          \n\
  163 __mexitcount:                                                   \n\
  164         nop                                                     \n\
  165                                                                 \n\
  166 GMON_PROF_HIRES =       4                                       \n\
  167                                                                 \n\
  168         .p2align 4,0x90                                         \n\
  169         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
  170 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
  171         .globl  __cyg_profile_func_exit                         \n\
  172 __cyg_profile_func_exit:                                        \n\
  173         cmpl    $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  174         jne     .mexitcount_exit                                \n\
  175         pushq   %rax                                            \n\
  176         pushq   %rdx                                            \n\
  177         pushq   %rcx                                            \n\
  178         pushq   %rsi                                            \n\
  179         pushq   %rdi                                            \n\
  180         pushq   %r8                                             \n\
  181         pushq   %r9                                             \n\
  182         movq    7*8(%rsp),%rdi                                  \n\
  183         pushfq                                                  \n\
  184         cli                                                     \n\
  185         call    " __XSTRING(CNAME(mexitcount)) "                \n\
  186         popfq                                                   \n\
  187         popq    %r9                                             \n\
  188         popq    %r8                                             \n\
  189         popq    %rdi                                            \n\
  190         popq    %rsi                                            \n\
  191         popq    %rcx                                            \n\
  192         popq    %rdx                                            \n\
  193         popq    %rax                                            \n\
  194 .mexitcount_exit:                                               \n\
  195         ret                                                     \n\
  196 ");
  197 #else /* !(__GNUC__ || __INTEL_COMPILER) */
  198 #error
  199 #endif /* __GNUC__ || __INTEL_COMPILER */
  200 
  201 /*
  202  * Return the time elapsed since the last call.  The units are machine-
  203  * dependent.
  204  */
  205 int
  206 cputime()
  207 {
  208         u_int count;
  209         int delta;
  210 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
  211     defined(PERFMON) && defined(I586_PMC_GUPROF)
  212         u_quad_t event_count;
  213 #endif
  214         u_char high, low;
  215         static u_int prev_count;
  216 
  217 #ifndef SMP
  218         if (cputime_clock == CPUTIME_CLOCK_TSC) {
  219                 /*
  220                  * Scale the TSC a little to make cputime()'s frequency
  221                  * fit in an int, assuming that the TSC frequency fits
  222                  * in a u_int.  Use a fixed scale since dynamic scaling
  223                  * would be slower and we can't really use the low bit
  224                  * of precision.
  225                  */
  226                 count = (u_int)rdtsc() & ~1u;
  227                 delta = (int)(count - prev_count) >> 1;
  228                 prev_count = count;
  229                 return (delta);
  230         }
  231 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  232         if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
  233                 /*
  234                  * XXX permon_read() should be inlined so that the
  235                  * perfmon module doesn't need to be compiled with
  236                  * profiling disabled and so that it is fast.
  237                  */
  238                 perfmon_read(0, &event_count);
  239 
  240                 count = (u_int)event_count;
  241                 delta = (int)(count - prev_count);
  242                 prev_count = count;
  243                 return (delta);
  244         }
  245 #endif /* PERFMON && I586_PMC_GUPROF */
  246 #endif /* !SMP */
  247 
  248         /*
  249          * Read the current value of the 8254 timer counter 0.
  250          */
  251         outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
  252         low = inb(TIMER_CNTR0);
  253         high = inb(TIMER_CNTR0);
  254         count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
  255 
  256         /*
  257          * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
  258          * While profiling is enabled, this routine is called at least twice
  259          * per timer reset (for mcounting and mexitcounting hardclock()),
  260          * so at most one reset has occurred since the last call, and one
  261          * has occurred iff the current count is larger than the previous
  262          * count.  This allows counter underflow to be detected faster
  263          * than in microtime().
  264          */
  265         delta = prev_count - count;
  266         prev_count = count;
  267         if ((int) delta <= 0)
  268                 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
  269         return (delta);
  270 }
  271 
  272 static int
  273 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
  274 {
  275         int clock;
  276         int error;
  277 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  278         int event;
  279         struct pmc pmc;
  280 #endif
  281 
  282         clock = cputime_clock;
  283 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  284         if (clock == CPUTIME_CLOCK_I586_PMC) {
  285                 pmc.pmc_val = cputime_clock_pmc_conf;
  286                 clock += pmc.pmc_event;
  287         }
  288 #endif
  289         error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
  290         if (error == 0 && req->newptr != NULL) {
  291 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  292                 if (clock >= CPUTIME_CLOCK_I586_PMC) {
  293                         event = clock - CPUTIME_CLOCK_I586_PMC;
  294                         if (event >= 256)
  295                                 return (EINVAL);
  296                         pmc.pmc_num = 0;
  297                         pmc.pmc_event = event;
  298                         pmc.pmc_unit = 0;
  299                         pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
  300                         pmc.pmc_mask = 0;
  301                         cputime_clock_pmc_conf = pmc.pmc_val;
  302                         cputime_clock = CPUTIME_CLOCK_I586_PMC;
  303                 } else
  304 #endif
  305                 {
  306                         if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
  307                                 return (EINVAL);
  308                         cputime_clock = clock;
  309                 }
  310         }
  311         return (error);
  312 }
  313 
  314 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
  315             0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
  316 
  317 /*
  318  * The start and stop routines need not be here since we turn off profiling
  319  * before calling them.  They are here for convenience.
  320  */
  321 
  322 void
  323 startguprof(gp)
  324         struct gmonparam *gp;
  325 {
  326         if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
  327                 cputime_clock = CPUTIME_CLOCK_I8254;
  328 #ifndef SMP
  329                 if (tsc_freq != 0)
  330                         cputime_clock = CPUTIME_CLOCK_TSC;
  331 #endif
  332         }
  333         gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
  334 #ifndef SMP
  335         if (cputime_clock == CPUTIME_CLOCK_TSC)
  336                 gp->profrate = tsc_freq >> 1;
  337 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  338         else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
  339                 if (perfmon_avail() &&
  340                     perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
  341                         if (perfmon_start(0) != 0)
  342                                 perfmon_fini(0);
  343                         else {
  344                                 /* XXX 1 event == 1 us. */
  345                                 gp->profrate = 1000000;
  346 
  347                                 saved_gmp = *gp;
  348 
  349                                 /* Zap overheads.  They are invalid. */
  350                                 gp->cputime_overhead = 0;
  351                                 gp->mcount_overhead = 0;
  352                                 gp->mcount_post_overhead = 0;
  353                                 gp->mcount_pre_overhead = 0;
  354                                 gp->mexitcount_overhead = 0;
  355                                 gp->mexitcount_post_overhead = 0;
  356                                 gp->mexitcount_pre_overhead = 0;
  357 
  358                                 cputime_clock_pmc_init = TRUE;
  359                         }
  360                 }
  361         }
  362 #endif /* PERFMON && I586_PMC_GUPROF */
  363 #endif /* !SMP */
  364         cputime_bias = 0;
  365         cputime();
  366 }
  367 
  368 void
  369 stopguprof(gp)
  370         struct gmonparam *gp;
  371 {
  372 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  373         if (cputime_clock_pmc_init) {
  374                 *gp = saved_gmp;
  375                 perfmon_fini(0);
  376                 cputime_clock_pmc_init = FALSE;
  377         }
  378 #endif
  379 }
  380 
  381 #else /* !GUPROF */
  382 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  383 __asm("                                                         \n\
  384         .text                                                   \n\
  385         .p2align 4,0x90                                         \n\
  386         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
  387 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
  388         ret                                                     \n\
  389 ");
  390 #else /* !(__GNUC__ || __INTEL_COMPILER) */
  391 #error
  392 #endif /* __GNUC__ || __INTEL_COMPILER */
  393 #endif /* GUPROF */

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