sys/platform/pc64/isa/prof_machdep.c

   1 /*-
   2  * Copyright (c) 1996 Bruce D. Evans.
   3  * Copyright (c) 2008 The DragonFly Project.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/i386/isa/prof_machdep.c,v 1.14.2.1 2000/08/03 00:09:30 ps Exp $
  28  */
  29
  30 #ifdef GUPROF
  31 #include "opt_i586_guprof.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/profile.h>
  41 #undef MCOUNT
  42 #endif
  43
  44 #include <machine/asmacros.h>
  45
  46 #include <bus/isa/isa.h>
  47 #include <machine_base/isa/timerreg.h>
  48
  49 #ifdef GUPROF
  50 #define CPUTIME_CLOCK_UNINITIALIZED     0
  51 #define CPUTIME_CLOCK_I8254             1
  52 #define CPUTIME_CLOCK_TSC               2
  53 #define CPUTIME_CLOCK_I586_PMC          3
  54 #define CPUTIME_CLOCK_I8254_SHIFT       7
  55
  56 int     cputime_bias = 1;       /* initialize for locality of reference */
  57
  58 static int      cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
  59 #endif /* GUPROF */
  60
  61 #ifdef __GNUC__
  62 __asm("                                                         \n\
  63 GM_STATE        =       0                                       \n\
  64 GMON_PROF_OFF   =       3                                       \n\
  65                                                                 \n\
  66         .text                                                   \n\
  67         .p2align 4,0x90                                         \n\
  68         .globl  __mcount                                        \n\
  69         .type   __mcount,@function                              \n\
  70 __mcount:                                                       \n\
  71         #                                                       \n\
  72         # Check that we are profiling.  Do it early for speed.  \n\
  73         #                                                       \n\
  74         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  75         je      .mcount_exit                                    \n\
  76         #                                                       \n\
  77         # __mcount is the same as [.]mcount except the caller   \n\
  78         # hasn't changed the stack except to call here, so the  \n\
  79         # caller's raddr is above our raddr.                    \n\
  80         #                                                       \n\
  81         pushl   %eax                                            \n\
  82         pushl   %ecx                                            \n\
  83         pushl   %edx                                            \n\
  84         movl    12+4(%esp),%edx                                 \n\
  85         jmp     .got_frompc                                     \n\
  86                                                                 \n\
  87         .p2align 4,0x90                                         \n\
  88         .globl  " __XSTRING(HIDENAME(mcount)) "                 \n\
  89 " __XSTRING(HIDENAME(mcount)) ":                                \n\
  90         cmpl    $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
  91         je      .mcount_exit                                    \n\
  92         #                                                       \n\
  93         # The caller's stack frame has already been built, so   \n\
  94         # %ebp is the caller's frame pointer.  The caller's     \n\
  95         # raddr is in the caller's frame following the caller's \n\
  96         # caller's frame pointer.                               \n\
  97         #                                                       \n\
  98         pushl   %eax                                            \n\
  99         pushl   %ecx                                            \n\
 100         pushl   %edx                                            \n\
 101         movl    4(%ebp),%edx                                    \n\
 102 .got_frompc:                                                    \n\
 103         #                                                       \n\
 104         # Our raddr is the caller's pc.                         \n\
 105         #                                                       \n\
 106         movl    (%esp),%eax                                     \n\
 107                                                                 \n\
 108         pushfl                                                  \n\
 109         pushl   %eax                                            \n\
 110         pushl   %edx                                            \n\
 111         cli                                                     \n\
 112         call    " __XSTRING(CNAME(mcount)) "                    \n\
 113         addl    $8,%esp                                         \n\
 114         popfl                                                   \n\
 115         popl    %edx                                            \n\
 116         popl    %ecx                                            \n\
 117         popl    %eax                                            \n\
 118 .mcount_exit:                                                   \n\
 119         ret                                                     \n\
 120 ");
 121 #else /* !__GNUC__ */
 122 #error
 123 #endif /* __GNUC__ */
 124
 125 #ifdef GUPROF
 126 /*
 127  * [.]mexitcount saves the return register(s), loads selfpc and calls
 128  * mexitcount(selfpc) to do the work.  Someday it should be in a machine
 129  * dependent file together with cputime(), __mcount and [.]mcount.  cputime()
 130  * can't just be put in machdep.c because it has to be compiled without -pg.
 131  */
 132 #ifdef __GNUC__
 133 __asm("                                                         \n\
 134         .text                                                   \n\
 135 #                                                               \n\
 136 # Dummy label to be seen when gprof -u hides [.]mexitcount.     \n\
 137 #                                                               \n\
 138         .p2align 4,0x90                                         \n\
 139         .globl  __mexitcount                                    \n\
 140         .type   __mexitcount,@function                          \n\
 141 __mexitcount:                                                   \n\
 142         nop                                                     \n\
 143                                                                 \n\
 144 GMON_PROF_HIRES =       4                                       \n\
 145                                                                 \n\
 146         .p2align 4,0x90                                         \n\
 147         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
 148 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
 149         cmpl    $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
 150         jne     .mexitcount_exit                                \n\
 151         pushl   %edx                                            \n\
 152         pushl   %ecx                                            \n\
 153         pushl   %eax                                            \n\
 154         movl    12(%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    %ecx                                            \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(void)
 177 {
 178         u_int count;
 179         int delta;
 180         u_char high, low;
 181         static u_int prev_count;
 182
 183         /*
 184          * Read the current value of the 8254 timer counter 0.
 185          */
 186         outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
 187         low = inb(TIMER_CNTR0);
 188         high = inb(TIMER_CNTR0);
 189         count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
 190
 191         /*
 192          * The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
 193          * While profiling is enabled, this routine is called at least twice
 194          * per timer reset (for mcounting and mexitcounting hardclock()),
 195          * so at most one reset has occurred since the last call, and one
 196          * has occurred iff the current count is larger than the previous
 197          * count.  This allows counter underflow to be detected faster
 198          * than in microtime().
 199          */
 200         delta = prev_count - count;
 201         prev_count = count;
 202         if (delta <= 0)
 203                 return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
 204         return (delta);
 205 }
 206
 207 static int
 208 sysctl_machdep_cputime_clock(SYSCTL_HANDLER_ARGS)
 209 {
 210         int clock;
 211         int error;
 212
 213         clock = cputime_clock;
 214         error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
 215         if (error == 0 && req->newptr != NULL) {
 216                 if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
 217                         return (EINVAL);
 218                 cputime_clock = clock;
 219         }
 220         return (error);
 221 }
 222
 223 SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
 224             0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
 225
 226 /*
 227  * The start and stop routines need not be here since we turn off profiling
 228  * before calling them.  They are here for convenience.
 229  */
 230
 231 void
 232 startguprof(struct gmonparam *gp)
 233 {
 234         if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED)
 235                 cputime_clock = CPUTIME_CLOCK_I8254;
 236         gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
 237         cputime_bias = 0;
 238         cputime();
 239 }
 240
 241 void
 242 stopguprof(struct gmonparam *gp)
 243 {
 244 }
 245
 246 #else /* !GUPROF */
 247 #ifdef __GNUC__
 248 __asm("                                                         \n\
 249         .text                                                   \n\
 250         .p2align 4,0x90                                         \n\
 251         .globl  " __XSTRING(HIDENAME(mexitcount)) "             \n\
 252 " __XSTRING(HIDENAME(mexitcount)) ":                            \n\
 253         ret                                                     \n\
 254 ");
 255 #else /* !__GNUC__ */
 256 #error
 257 #endif /* __GNUC__ */
 258 #endif /* GUPROF */