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  */
  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 #include <bus/isa/isa.h>
  48 #include <machine_base/isa/timerreg.h>
  49
  50 #ifdef GUPROF
  51 #define CPUTIME_CLOCK_UNINITIALIZED     0
  52 #define CPUTIME_CLOCK_I8254             1
  53 #define CPUTIME_CLOCK_TSC               2
  54 #define CPUTIME_CLOCK_I586_PMC          3
  55 #define CPUTIME_CLOCK_I8254_SHIFT       7
  56
  57 int     cputime_bias = 1;       /* initialize for locality of reference */
  58
  59 static int      cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
  60 #ifdef I586_PMC_GUPROF
  61 static u_int    cputime_clock_pmc_conf = I586_PMC_GUPROF;
  62 static int      cputime_clock_pmc_init;
  63 static struct gmonparam saved_gmp;
  64 #endif
  65 #endif /* GUPROF */
  66
  67 #ifdef __GNUC__
  68 __asm("                                                         \n\
  69 GM_STATE        =       0                                       \n\
  70 GMON_PROF_OFF   =       3                                       \n\
  71                                                                 \n\
  72         .text                                                   \n\
  73         .p2align 4,0x90                                         \n\
  74         .globl  __mcount                                        \n\
  75         .type   __mcount,@function                              \n\
  76 __mcount:                                                       \n\
  77         #                                                       \n\
  78         # Check that we are profiling.  Do it early for speed.  \n\
  79         #                                                       \n\
  80         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  81         je      .mcount_exit                                    \n\
  82         #                                                       \n\
  83         # __mcount is the same as [.]mcount except the caller   \n\
  84         # hasn't changed the stack except to call here, so the  \n\
  85         # caller's raddr is above our raddr.                    \n\
  86         #                                                       \n\
  87         pushl   %eax                                            \n\
  88         pushl   %ecx                                            \n\
  89         pushl   %edx                                            \n\
  90         movl    12+4(%esp),%edx                                 \n\
  91         jmp     .got_frompc                                     \n\
  92                                                                 \n\
  93         .p2align 4,0x90                                         \n\
  94         .globl  " __XSTRING(HIDENAME(mcount)) "                 \n\
  95 " __XSTRING(HIDENAME(mcount)) ":                                \n\
  96         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  97         je      .mcount_exit                                    \n\
  98         #                                                       \n\
  99         # The caller's stack frame has already been built, so   \n\
 100         # %ebp is the caller's frame pointer.  The caller's     \n\
 101         # raddr is in the caller's frame following the caller's \n\
 102         # caller's frame pointer.                               \n\
 103         #                                                       \n\
 104         pushl   %eax                                            \n\
 105         pushl   %ecx                                            \n\
 106         pushl   %edx                                            \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         popl    %edx                                            \n\
 122         popl    %ecx                                            \n\
 123         popl    %eax                                            \n\
 124 .mcount_exit:                                                   \n\
 125         ret                                                     \n\
 126 ");
 127 #else /* !__GNUC__ */
 128 #error
 129 #endif /* __GNUC__ */
 130
 131 #ifdef GUPROF
 132 /*
 133  * [.]mexitcount saves the return register(s), loads selfpc and calls
 134  * mexitcount(selfpc) to do the work.  Someday it should be in a machine
 135  * dependent file together with cputime(), __mcount and [.]mcount.  cputime()
 136  * can't just be put in machdep.c because it has to be compiled without -pg.
 137  */
 138 #ifdef __GNUC__
 139 __asm("                                                         \n\
 140         .text                                                   \n\
 141 #                                                               \n\
 142 # Dummy label to be seen when gprof -u hides [.]mexitcount.     \n\
 143 #                                                               \n\
 144         .p2align 4,0x90                                         \n\
 145         .globl  __mexitcount                                    \n\
 146         .type   __mexitcount,@function                          \n\
 147 __mexitcount:                                                   \n\
 148         nop                                                     \n\
 149                                                                 \n\
 150 GMON_PROF_HIRES =       4                                       \n\
 151                                                                 \n\
 152         .p2align 4,0x90                                         \n\
 153         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
 154 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
 155         cmpl    $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
 156         jne     .mexitcount_exit                                \n\
 157         pushl   %edx                                            \n\
 158         pushl   %ecx                                            \n\
 159         pushl   %eax                                            \n\
 160         movl    12(%esp),%eax                                   \n\
 161         pushfl                                                  \n\
 162         pushl   %eax                                            \n\
 163         cli                                                     \n\
 164         call    " __XSTRING(CNAME(mexitcount)) "                \n\
 165         addl    $4,%esp                                         \n\
 166         popfl                                                   \n\
 167         popl    %eax                                            \n\
 168         popl    %ecx                                            \n\
 169         popl    %edx                                            \n\
 170 .mexitcount_exit:                                               \n\
 171         ret                                                     \n\
 172 ");
 173 #else /* !__GNUC__ */
 174 #error
 175 #endif /* __GNUC__ */
 176
 177 /*
 178  * Return the time elapsed since the last call.  The units are machine-
 179  * dependent.
 180  */
 181 int
 182 cputime(void)
 183 {
 184         u_int count;
 185         int delta;
 186         u_char high, low;
 187         static u_int prev_count;
 188
 189         /*
 190          * Read the current value of the 8254 timer counter 0.
 191          */
 192         outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
 193         low = inb(TIMER_CNTR0);
 194         high = inb(TIMER_CNTR0);
 195         count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
 196
 197         /*
 198          * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
 199          * While profiling is enabled, this routine is called at least twice
 200          * per timer reset (for mcounting and mexitcounting hardclock()),
 201          * so at most one reset has occurred since the last call, and one
 202          * has occurred iff the current count is larger than the previous
 203          * count.  This allows counter underflow to be detected faster
 204          * than in microtime().
 205          */
 206         delta = prev_count - count;
 207         prev_count = count;
 208         if (delta <= 0)
 209                 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
 210         return (delta);
 211 }
 212
 213 static int
 214 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
 215 {
 216         int clock;
 217         int error;
 218 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 219         int event;
 220         struct pmc pmc;
 221 #endif
 222
 223         clock = cputime_clock;
 224 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 225         if (clock == CPUTIME_CLOCK_I586_PMC) {
 226                 pmc.pmc_val = cputime_clock_pmc_conf;
 227                 clock += pmc.pmc_event;
 228         }
 229 #endif
 230         error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
 231         if (error == 0 && req->newptr != NULL) {
 232 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 233                 if (clock >= CPUTIME_CLOCK_I586_PMC) {
 234                         event = clock - CPUTIME_CLOCK_I586_PMC;
 235                         if (event >= 256)
 236                                 return (EINVAL);
 237                         pmc.pmc_num = 0;
 238                         pmc.pmc_event = event;
 239                         pmc.pmc_unit = 0;
 240                         pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
 241                         pmc.pmc_mask = 0;
 242                         cputime_clock_pmc_conf = pmc.pmc_val;
 243                         cputime_clock = CPUTIME_CLOCK_I586_PMC;
 244                 } else
 245 #endif
 246                 {
 247                         if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
 248                                 return (EINVAL);
 249                         cputime_clock = clock;
 250                 }
 251         }
 252         return (error);
 253 }
 254
 255 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
 256             0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
 257
 258 /*
 259  * The start and stop routines need not be here since we turn off profiling
 260  * before calling them.  They are here for convenience.
 261  */
 262
 263 void
 264 startguprof(struct gmonparam *gp)
 265 {
 266         if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED)
 267                 cputime_clock = CPUTIME_CLOCK_I8254;
 268         gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
 269         cputime_bias = 0;
 270         cputime();
 271 }
 272
 273 void
 274 stopguprof(struct gmonparam *gp)
 275 {
 276 #if defined(PERFMON) && defined(I586_PMC_GUPROF)
 277         if (cputime_clock_pmc_init) {
 278                 *gp = saved_gmp;
 279                 perfmon_fini(0);
 280                 cputime_clock_pmc_init = FALSE;
 281         }
 282 #endif
 283 }
 284
 285 #else /* !GUPROF */
 286 #ifdef __GNUC__
 287 __asm("                                                         \n\
 288         .text                                                   \n\
 289         .p2align 4,0x90                                         \n\
 290         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
 291 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
 292         ret                                                     \n\
 293 ");
 294 #else /* !__GNUC__ */
 295 #error
 296 #endif /* __GNUC__ */
 297 #endif /* GUPROF */