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/*-
* Copyright (c) 1996 Bruce D. Evans.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: prof_machdep.c,v 1.3 1996/10/17 19:32:10 bde Exp $
*/
#ifdef GUPROF
#include "opt_cpu.h"
#include "opt_i586_guprof.h"
#include "opt_perfmon.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/gmon.h>
#include <machine/clock.h>
#include <machine/perfmon.h>
#include <machine/profile.h>
#endif
#ifdef PC98
#include <pc98/pc98/pc98.h>
#else
#include <i386/isa/isa.h>
#endif
#include <i386/isa/timerreg.h>
#ifdef GUPROF
#define CPUTIME_CLOCK_UNINITIALIZED 0
#define CPUTIME_CLOCK_I8254 1
#define CPUTIME_CLOCK_I586_CTR 2
#define CPUTIME_CLOCK_I586_PMC 3
#define CPUTIME_CLOCK_I8254_SHIFT 7
int cputime_bias = 1; /* initialize for locality of reference */
static int cputime_clock = CPUTIME_CLOCK_UNINITIALIZED;
#ifdef I586_PMC_GUPROF
static u_int cputime_clock_pmc_conf = I586_PMC_GUPROF;
static int cputime_clock_pmc_init;
static struct gmonparam saved_gmp;
#endif
#endif /* GUPROF */
#ifdef __GNUC__
asm("
GM_STATE = 0
GMON_PROF_OFF = 3
.text
.align 4,0x90
.globl __mcount
__mcount:
#
# Check that we are profiling. Do it early for speed.
#
cmpl $GMON_PROF_OFF,__gmonparam+GM_STATE
je Lmcount_exit
#
# __mcount is the same as mcount except the caller hasn't changed
# the stack except to call here, so the caller's raddr is above
# our raddr.
#
movl 4(%esp),%edx
jmp Lgot_frompc
.align 4,0x90
.globl mcount
mcount:
cmpl $GMON_PROF_OFF,__gmonparam+GM_STATE
je Lmcount_exit
#
# The caller's stack frame has already been built, so %ebp is
# the caller's frame pointer. The caller's raddr is in the
# caller's frame following the caller's caller's frame pointer.
#
movl 4(%ebp),%edx
Lgot_frompc:
#
# Our raddr is the caller's pc.
#
movl (%esp),%eax
pushfl
pushl %eax
pushl %edx
cli
call _mcount
addl $8,%esp
popfl
Lmcount_exit:
ret
");
#else /* !__GNUC__ */
#error
#endif /* __GNUC__ */
#ifdef GUPROF
/*
* mexitcount saves the return register(s), loads selfpc and calls
* mexitcount(selfpc) to do the work. Someday it should be in a machine
* dependent file together with cputime(), __mcount and mcount. cputime()
* can't just be put in machdep.c because it has to be compiled without -pg.
*/
#ifdef __GNUC__
asm("
.text
#
# Dummy label to be seen when gprof -u hides mexitcount.
#
.align 4,0x90
.globl __mexitcount
__mexitcount:
nop
GMON_PROF_HIRES = 4
.align 4,0x90
.globl mexitcount
mexitcount:
cmpl $GMON_PROF_HIRES,__gmonparam+GM_STATE
jne Lmexitcount_exit
pushl %edx
pushl %eax
movl 8(%esp),%eax
pushfl
pushl %eax
cli
call _mexitcount
addl $4,%esp
popfl
popl %eax
popl %edx
Lmexitcount_exit:
ret
");
#else /* !__GNUC__ */
#error
#endif /* __GNUC__ */
/*
* Return the time elapsed since the last call. The units are machine-
* dependent.
*/
int
cputime()
{
u_int count;
int delta;
#ifdef I586_PMC_GUPROF
u_quad_t event_count;
#endif
u_char high, low;
static u_int prev_count;
#if defined(I586_CPU) || defined(I686_CPU)
if (cputime_clock == CPUTIME_CLOCK_I586_CTR) {
count = (u_int)rdtsc();
delta = (int)(count - prev_count);
prev_count = count;
return (delta);
}
#ifdef I586_PMC_GUPROF
if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
/*
* XXX permon_read() should be inlined so that the
* perfmon module doesn't need to be compiled with
* profiling disabled and so that it is fast.
*/
perfmon_read(0, &event_count);
count = (u_int)event_count;
delta = (int)(count - prev_count);
prev_count = count;
return (delta);
}
#endif /* I586_PMC_GUPROF */
#endif /* I586_CPU or I686_CPU */
/*
* Read the current value of the 8254 timer counter 0.
*/
outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
low = inb(TIMER_CNTR0);
high = inb(TIMER_CNTR0);
count = ((high << 8) | low) << CPUTIME_CLOCK_I8254_SHIFT;
/*
* The timer counts down from TIMER_CNTR0_MAX to 0 and then resets.
* While profiling is enabled, this routine is called at least twice
* per timer reset (for mcounting and mexitcounting hardclock()),
* so at most one reset has occurred since the last call, and one
* has occurred iff the current count is larger than the previous
* count. This allows counter underflow to be detected faster
* than in microtime().
*/
delta = prev_count - count;
prev_count = count;
if ((int) delta <= 0)
return (delta + (timer0_max_count << CPUTIME_CLOCK_I8254_SHIFT));
return (delta);
}
/*
* The start and stop routines need not be here since we turn off profiling
* before calling them. They are here for convenience.
*/
void
startguprof(gp)
struct gmonparam *gp;
{
if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
cputime_clock = CPUTIME_CLOCK_I8254;
#if defined(I586_CPU) || defined(I686_CPU)
if (i586_ctr_freq != 0)
cputime_clock = CPUTIME_CLOCK_I586_CTR;
#endif
}
gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
#if defined(I586_CPU) || defined(I686_CPU)
if (cputime_clock == CPUTIME_CLOCK_I586_CTR)
gp->profrate = i586_ctr_freq;
#ifdef I586_PMC_GUPROF
else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
if (perfmon_avail() &&
perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
if (perfmon_start(0) != 0)
perfmon_fini(0);
else {
/* XXX 1 event == 1 us. */
gp->profrate = 1000000;
saved_gmp = *gp;
/* Zap overheads. They are invalid. */
gp->cputime_overhead = 0;
gp->mcount_overhead = 0;
gp->mcount_post_overhead = 0;
gp->mcount_pre_overhead = 0;
gp->mexitcount_overhead = 0;
gp->mexitcount_post_overhead = 0;
gp->mexitcount_pre_overhead = 0;
cputime_clock_pmc_init = TRUE;
}
}
}
#endif /* I586_PMC_GUPROF */
#endif /* I586_CPU or I686_CPU */
cputime_bias = 0;
cputime();
}
void
stopguprof(gp)
struct gmonparam *gp;
{
#if defined(PERFMON) && defined(I586_PMC_GUPROF)
if (cputime_clock_pmc_init) {
*gp = saved_gmp;
perfmon_fini(0);
cputime_clock_pmc_init = FALSE;
}
#endif
}
#else /* !GUPROF */
#ifdef __GNUC__
asm("
.text
.align 4,0x90
.globl mexitcount
mexitcount:
ret
");
#else /* !__GNUC__ */
#error
#endif /* __GNUC__ */
#endif /* GUPROF */
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