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