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freebsd/sys/i386/isa/prof_machdep.c
Bruce Evans ea2b3e3d1b Fixed profiling of elf kernels. Made high resolution profiling compile 
for elf kernels (it is broken for all kernels due to lack of egcs support).

Renaming of many assembler labels is avoided by declaring by declaring
the labels that need to be visible to gprof as having type "function"
and depending on the elf version of gprof being zealous about discarding
the others.  A few type declarations are still missing, mainly for SMP.

PR:		9413
Submitted by:	Assar Westerlund <assar@sics.se> (initial parts)
1999-05-06 09:44:57 +00:00

356 lines
9.7 KiB
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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 1.11 1998/12/14 18:21:34 bde Exp $
*/
#ifdef GUPROF
#include "opt_i586_guprof.h"
#include "opt_perfmon.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/gmon.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <machine/clock.h>
#include <machine/perfmon.h>
#include <machine/profile.h>
#undef MCOUNT
#endif
#include <machine/asmacros.h>
#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_TSC 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(" \n\
GM_STATE = 0 \n\
GMON_PROF_OFF = 3 \n\
\n\
.text \n\
.align 4,0x90 \n\
.globl __mcount \n\
.type __mcount,@function \n\
__mcount: \n\
# \n\
# Check that we are profiling. Do it early for speed. \n\
# \n\
cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
je .mcount_exit \n\
# \n\
# __mcount is the same as [.]mcount except the caller \n\
# hasn't changed the stack except to call here, so the \n\
# caller's raddr is above our raddr. \n\
# \n\
movl 4(%esp),%edx \n\
jmp .got_frompc \n\
\n\
.align 4,0x90 \n\
.globl " __XSTRING(HIDENAME(mcount)) " \n\
" __XSTRING(HIDENAME(mcount)) ": \n\
cmpl $GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
je .mcount_exit \n\
# \n\
# The caller's stack frame has already been built, so \n\
# %ebp is the caller's frame pointer. The caller's \n\
# raddr is in the caller's frame following the caller's \n\
# caller's frame pointer. \n\
# \n\
movl 4(%ebp),%edx \n\
.got_frompc: \n\
# \n\
# Our raddr is the caller's pc. \n\
# \n\
movl (%esp),%eax \n\
\n\
pushfl \n\
pushl %eax \n\
pushl %edx \n\
cli \n\
call " __XSTRING(CNAME(mcount)) " \n\
addl $8,%esp \n\
popfl \n\
.mcount_exit: \n\
ret \n\
");
#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(" \n\
.text \n\
# \n\
# Dummy label to be seen when gprof -u hides [.]mexitcount. \n\
# \n\
.align 4,0x90 \n\
.globl __mexitcount \n\
.type __mexitcount,@function \n\
__mexitcount: \n\
nop \n\
\n\
GMON_PROF_HIRES = 4 \n\
\n\
.align 4,0x90 \n\
.globl " __XSTRING(HIDENAME(mexitcount)) " \n\
" __XSTRING(HIDENAME(mexitcount)) ": \n\
cmpl $GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
jne .mexitcount_exit \n\
pushl %edx \n\
pushl %eax \n\
movl 8(%esp),%eax \n\
pushfl \n\
pushl %eax \n\
cli \n\
call " __XSTRING(CNAME(mexitcount)) " \n\
addl $4,%esp \n\
popfl \n\
popl %eax \n\
popl %edx \n\
.mexitcount_exit: \n\
ret \n\
");
#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;
#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP) && \
defined(PERFMON) && defined(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)) && !defined(SMP)
if (cputime_clock == CPUTIME_CLOCK_TSC) {
count = (u_int)rdtsc();
delta = (int)(count - prev_count);
prev_count = count;
return (delta);
}
#if defined(PERFMON) && defined(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 /* PERFMON && I586_PMC_GUPROF */
#endif /* (I586_CPU || I686_CPU) && !SMP */
/*
* 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);
}
static int
sysctl_machdep_cputime_clock SYSCTL_HANDLER_ARGS
{
int clock;
int error;
#if defined(PERFMON) && defined(I586_PMC_GUPROF)
int event;
struct pmc pmc;
#endif
clock = cputime_clock;
#if defined(PERFMON) && defined(I586_PMC_GUPROF)
if (clock == CPUTIME_CLOCK_I586_PMC) {
pmc.pmc_val = cputime_clock_pmc_conf;
clock += pmc.pmc_event;
}
#endif
error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
if (error == 0 && req->newptr != NULL) {
#if defined(PERFMON) && defined(I586_PMC_GUPROF)
if (clock >= CPUTIME_CLOCK_I586_PMC) {
event = clock - CPUTIME_CLOCK_I586_PMC;
if (event >= 256)
return (EINVAL);
pmc.pmc_num = 0;
pmc.pmc_event = event;
pmc.pmc_unit = 0;
pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
pmc.pmc_mask = 0;
cputime_clock_pmc_conf = pmc.pmc_val;
cputime_clock = CPUTIME_CLOCK_I586_PMC;
} else
#endif
{
if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
return (EINVAL);
cputime_clock = clock;
}
}
return (error);
}
SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
/*
* 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)) && !defined(SMP)
if (tsc_freq != 0)
cputime_clock = CPUTIME_CLOCK_TSC;
#endif
}
gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
if (cputime_clock == CPUTIME_CLOCK_TSC)
gp->profrate = tsc_freq;
#if defined(PERFMON) && defined(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 /* PERFMON && I586_PMC_GUPROF */
#endif /* (I586_CPU || I686_CPU) && !SMP */
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(" \n\
.text \n\
.align 4,0x90 \n\
.globl " __XSTRING(HIDENAME(mexitcount)) " \n\
" __XSTRING(HIDENAME(mexitcount)) ": \n\
ret \n\
");
#else /* !__GNUC__ */
#error
#endif /* __GNUC__ */
#endif /* GUPROF */
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