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/6.1/sys/amd64/amd64/prof_machdep.c 158179 2006-04-30 16:44:43Z 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 #include <machine/timerreg.h>
   52 
   53 #ifdef GUPROF
   54 #define CPUTIME_CLOCK_UNINITIALIZED     0
   55 #define CPUTIME_CLOCK_I8254             1
   56 #define CPUTIME_CLOCK_TSC               2
   57 #define CPUTIME_CLOCK_I586_PMC          3
   58 #define CPUTIME_CLOCK_I8254_SHIFT       7
   59 
   60 int     cputime_bias = 1;       /* initialize for locality of reference */
   61 
   62 static int      cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
   63 #ifdef I586_PMC_GUPROF
   64 static u_int    cputime_clock_pmc_conf = I586_PMC_GUPROF;
   65 static int      cputime_clock_pmc_init;
   66 static struct gmonparam saved_gmp;
   67 #endif
   68 #endif /* GUPROF */
   69 
   70 #ifdef __GNUCLIKE_ASM
   71 __asm("                                                         \n\
   72 GM_STATE        =       0                                       \n\
   73 GMON_PROF_OFF   =       3                                       \n\
   74                                                                 \n\
   75         .text                                                   \n\
   76         .p2align 4,0x90                                         \n\
   77         .globl  __mcount                                        \n\
   78         .type   __mcount,@function                              \n\
   79 __mcount:                                                       \n\
   80         #                                                       \n\
   81         # Check that we are profiling.  Do it early for speed.  \n\
   82         #                                                       \n\
   83         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
   84         je      .mcount_exit                                    \n\
   85         #                                                       \n\
   86         # __mcount is the same as [.]mcount except the caller   \n\
   87         # hasn't changed the stack except to call here, so the  \n\
   88         # caller's raddr is above our raddr.                    \n\
   89         #                                                       \n\
   90         pushq   %rax                                            \n\
   91         pushq   %rdx                                            \n\
   92         pushq   %rcx                                            \n\
   93         pushq   %rsi                                            \n\
   94         pushq   %rdi                                            \n\
   95         pushq   %r8                                             \n\
   96         pushq   %r9                                             \n\
   97         movq    7*8+8(%rsp),%rdi                                \n\
   98         jmp     .got_frompc                                     \n\
   99                                                                 \n\
  100         .p2align 4,0x90                                         \n\
  101         .globl  " __XSTRING(HIDENAME(mcount)) "                 \n\
  102 " __XSTRING(HIDENAME(mcount)) ":                                \n\
  103         .globl  __cyg_profile_func_enter                        \n\
  104 __cyg_profile_func_enter:                                       \n\
  105         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  106         je      .mcount_exit                                    \n\
  107         #                                                       \n\
  108         # The caller's stack frame has already been built, so   \n\
  109         # %rbp is the caller's frame pointer.  The caller's     \n\
  110         # raddr is in the caller's frame following the caller's \n\
  111         # caller's frame pointer.                               \n\
  112         #                                                       \n\
  113         pushq   %rax                                            \n\
  114         pushq   %rdx                                            \n\
  115         pushq   %rcx                                            \n\
  116         pushq   %rsi                                            \n\
  117         pushq   %rdi                                            \n\
  118         pushq   %r8                                             \n\
  119         pushq   %r9                                             \n\
  120         movq    8(%rbp),%rdi                                    \n\
  121 .got_frompc:                                                    \n\
  122         #                                                       \n\
  123         # Our raddr is the caller's pc.                         \n\
  124         #                                                       \n\
  125         movq    7*8(%rsp),%rsi                                  \n\
  126                                                                 \n\
  127         pushfq                                                  \n\
  128         cli                                                     \n\
  129         call    " __XSTRING(CNAME(mcount)) "                    \n\
  130         popfq                                                   \n\
  131         popq    %r9                                             \n\
  132         popq    %r8                                             \n\
  133         popq    %rdi                                            \n\
  134         popq    %rsi                                            \n\
  135         popq    %rcx                                            \n\
  136         popq    %rdx                                            \n\
  137         popq    %rax                                            \n\
  138 .mcount_exit:                                                   \n\
  139         ret                                                     \n\
  140 ");
  141 #else /* !__GNUCLIKE_ASM */
  142 #error this file needs to be ported to your compiler
  143 #endif /* __GNUCLIKE_ASM */
  144 
  145 #ifdef GUPROF
  146 /*
  147  * [.]mexitcount saves the return register(s), loads selfpc and calls
  148  * mexitcount(selfpc) to do the work.  Someday it should be in a machine
  149  * dependent file together with cputime(), __mcount and [.]mcount.  cputime()
  150  * can't just be put in machdep.c because it has to be compiled without -pg.
  151  */
  152 #ifdef __GNUCLIKE_ASM
  153 __asm("                                                         \n\
  154         .text                                                   \n\
  155 #                                                               \n\
  156 # Dummy label to be seen when gprof -u hides [.]mexitcount.     \n\
  157 #                                                               \n\
  158         .p2align 4,0x90                                         \n\
  159         .globl  __mexitcount                                    \n\
  160         .type   __mexitcount,@function                          \n\
  161 __mexitcount:                                                   \n\
  162         nop                                                     \n\
  163                                                                 \n\
  164 GMON_PROF_HIRES =       4                                       \n\
  165                                                                 \n\
  166         .p2align 4,0x90                                         \n\
  167         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
  168 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
  169         .globl  __cyg_profile_func_exit                         \n\
  170 __cyg_profile_func_exit:                                        \n\
  171         cmpl    $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  172         jne     .mexitcount_exit                                \n\
  173         pushq   %rax                                            \n\
  174         pushq   %rdx                                            \n\
  175         pushq   %rcx                                            \n\
  176         pushq   %rsi                                            \n\
  177         pushq   %rdi                                            \n\
  178         pushq   %r8                                             \n\
  179         pushq   %r9                                             \n\
  180         movq    7*8(%rsp),%rdi                                  \n\
  181         pushfq                                                  \n\
  182         cli                                                     \n\
  183         call    " __XSTRING(CNAME(mexitcount)) "                \n\
  184         popfq                                                   \n\
  185         popq    %r9                                             \n\
  186         popq    %r8                                             \n\
  187         popq    %rdi                                            \n\
  188         popq    %rsi                                            \n\
  189         popq    %rcx                                            \n\
  190         popq    %rdx                                            \n\
  191         popq    %rax                                            \n\
  192 .mexitcount_exit:                                               \n\
  193         ret                                                     \n\
  194 ");
  195 #else /* !__GNUCLIKE_ASM */
  196 #error this file needs to be ported to your compiler
  197 #endif /* __GNUCLIKE_ASM */
  198 
  199 /*
  200  * Return the time elapsed since the last call.  The units are machine-
  201  * dependent.
  202  */
  203 int
  204 cputime()
  205 {
  206         u_int count;
  207         int delta;
  208 #if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
  209     defined(PERFMON) && defined(I586_PMC_GUPROF)
  210         u_quad_t event_count;
  211 #endif
  212         u_char high, low;
  213         static u_int prev_count;
  214 
  215 #ifndef SMP
  216         if (cputime_clock == CPUTIME_CLOCK_TSC) {
  217                 /*
  218                  * Scale the TSC a little to make cputime()'s frequency
  219                  * fit in an int, assuming that the TSC frequency fits
  220                  * in a u_int.  Use a fixed scale since dynamic scaling
  221                  * would be slower and we can't really use the low bit
  222                  * of precision.
  223                  */
  224                 count = (u_int)rdtsc() & ~1u;
  225                 delta = (int)(count - prev_count) >> 1;
  226                 prev_count = count;
  227                 return (delta);
  228         }
  229 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  230         if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
  231                 /*
  232                  * XXX permon_read() should be inlined so that the
  233                  * perfmon module doesn't need to be compiled with
  234                  * profiling disabled and so that it is fast.
  235                  */
  236                 perfmon_read(0, &event_count);
  237 
  238                 count = (u_int)event_count;
  239                 delta = (int)(count - prev_count);
  240                 prev_count = count;
  241                 return (delta);
  242         }
  243 #endif /* PERFMON && I586_PMC_GUPROF */
  244 #endif /* !SMP */
  245 
  246         /*
  247          * Read the current value of the 8254 timer counter 0.
  248          */
  249         outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
  250         low = inb(TIMER_CNTR0);
  251         high = inb(TIMER_CNTR0);
  252         count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
  253 
  254         /*
  255          * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
  256          * While profiling is enabled, this routine is called at least twice
  257          * per timer reset (for mcounting and mexitcounting hardclock()),
  258          * so at most one reset has occurred since the last call, and one
  259          * has occurred iff the current count is larger than the previous
  260          * count.  This allows counter underflow to be detected faster
  261          * than in microtime().
  262          */
  263         delta = prev_count - count;
  264         prev_count = count;
  265         if ((int) delta <= 0)
  266                 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
  267         return (delta);
  268 }
  269 
  270 static int
  271 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
  272 {
  273         int clock;
  274         int error;
  275 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  276         int event;
  277         struct pmc pmc;
  278 #endif
  279 
  280         clock = cputime_clock;
  281 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  282         if (clock == CPUTIME_CLOCK_I586_PMC) {
  283                 pmc.pmc_val = cputime_clock_pmc_conf;
  284                 clock += pmc.pmc_event;
  285         }
  286 #endif
  287         error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
  288         if (error == 0 && req->newptr != NULL) {
  289 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  290                 if (clock >= CPUTIME_CLOCK_I586_PMC) {
  291                         event = clock - CPUTIME_CLOCK_I586_PMC;
  292                         if (event >= 256)
  293                                 return (EINVAL);
  294                         pmc.pmc_num = 0;
  295                         pmc.pmc_event = event;
  296                         pmc.pmc_unit = 0;
  297                         pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
  298                         pmc.pmc_mask = 0;
  299                         cputime_clock_pmc_conf = pmc.pmc_val;
  300                         cputime_clock = CPUTIME_CLOCK_I586_PMC;
  301                 } else
  302 #endif
  303                 {
  304                         if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
  305                                 return (EINVAL);
  306                         cputime_clock = clock;
  307                 }
  308         }
  309         return (error);
  310 }
  311 
  312 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
  313             0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
  314 
  315 /*
  316  * The start and stop routines need not be here since we turn off profiling
  317  * before calling them.  They are here for convenience.
  318  */
  319 
  320 void
  321 startguprof(gp)
  322         struct gmonparam *gp;
  323 {
  324         if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
  325                 cputime_clock = CPUTIME_CLOCK_I8254;
  326 #ifndef SMP
  327                 if (tsc_freq != 0)
  328                         cputime_clock = CPUTIME_CLOCK_TSC;
  329 #endif
  330         }
  331         gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
  332 #ifndef SMP
  333         if (cputime_clock == CPUTIME_CLOCK_TSC)
  334                 gp->profrate = tsc_freq >> 1;
  335 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  336         else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
  337                 if (perfmon_avail() &&
  338                     perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
  339                         if (perfmon_start(0) != 0)
  340                                 perfmon_fini(0);
  341                         else {
  342                                 /* XXX 1 event == 1 us. */
  343                                 gp->profrate = 1000000;
  344 
  345                                 saved_gmp = *gp;
  346 
  347                                 /* Zap overheads.  They are invalid. */
  348                                 gp->cputime_overhead = 0;
  349                                 gp->mcount_overhead = 0;
  350                                 gp->mcount_post_overhead = 0;
  351                                 gp->mcount_pre_overhead = 0;
  352                                 gp->mexitcount_overhead = 0;
  353                                 gp->mexitcount_post_overhead = 0;
  354                                 gp->mexitcount_pre_overhead = 0;
  355 
  356                                 cputime_clock_pmc_init = TRUE;
  357                         }
  358                 }
  359         }
  360 #endif /* PERFMON && I586_PMC_GUPROF */
  361 #endif /* !SMP */
  362         cputime_bias = 0;
  363         cputime();
  364 }
  365 
  366 void
  367 stopguprof(gp)
  368         struct gmonparam *gp;
  369 {
  370 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
  371         if (cputime_clock_pmc_init) {
  372                 *gp = saved_gmp;
  373                 perfmon_fini(0);
  374                 cputime_clock_pmc_init = FALSE;
  375         }
  376 #endif
  377 }
  378 
  379 #else /* !GUPROF */
  380 #ifdef __GNUCLIKE_ASM
  381 __asm("                                                         \n\
  382         .text                                                   \n\
  383         .p2align 4,0x90                                         \n\
  384         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
  385 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
  386         ret                                                     \n\
  387 ");
  388 #else /* !__GNUCLIKE_ASM */
  389 #error this file needs to be ported to your compiler
  390 #endif /* __GNUCLIKE_ASM */
  391 #endif /* GUPROF */

Cache object: 50fc41780fdb54f7368134aaacccaa15


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