912e603778
looking at a high resolution clock for each of the following events: function call, function return, interrupt entry, interrupt exit, and interesting branches. The differences between the times of these events are added at appropriate places in a ordinary histogram (as if very fast statistical profiling sampled the pc at those places) so that ordinary gprof can be used to analyze the times. gmon.h: Histogram counters need to be 4 bytes for microsecond resolutions. They will need to be larger for the 586 clock. The comments were vax-centric and wrong even on vaxes. Does anyone disagree? gprof4.c: The standard gprof should support counters of all integral sizes and the size of the counter should be in the gmon header. This hack will do until then. (Use gprof4 -u to examine the results of non-statistical profiling.) config/*: Non-statistical profiling is configured with `config -pp'. `config -p' still gives ordinary profiling. kgmon/*: Non-statistical profiling is enabled with `kgmon -B'. `kgmon -b' still enables ordinary profiling (and distables non-statistical profiling) if non-statistical profiling is configured.
137 lines
5.8 KiB
C
137 lines
5.8 KiB
C
/*-
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* Copyright (c) 1993 The Regents of the University of California.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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: asmacros.h,v 1.5 1994/09/08 12:25:18 bde Exp $
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*/
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#ifndef _MACHINE_ASMACROS_H_
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#define _MACHINE_ASMACROS_H_
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#ifdef KERNEL
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/* XXX too much duplication in various asm*.h's and gprof.h's */
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#define ALIGN_DATA .align 2 /* 4 byte alignment, zero filled */
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#define ALIGN_TEXT .align 2,0x90 /* 4-byte alignment, nop filled */
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#define SUPERALIGN_TEXT .align 4,0x90 /* 16-byte alignment (better for 486), nop filled */
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#define GEN_ENTRY(name) ALIGN_TEXT; .globl _/**/name; _/**/name:
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#define NON_GPROF_ENTRY(name) GEN_ENTRY(name)
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#ifdef GPROF
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/*
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* __mcount is like mcount except that doesn't require its caller to set
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* up a frame pointer. It must be called before pushing anything onto the
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* stack. gcc should eventually generate code to call __mcount in most
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* cases. This would make -pg in combination with -fomit-frame-pointer
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* useful. gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
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* allow profiling before setting up the frame pointer, but this is
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* inadequate for good handling of special cases, e.g., -fpic works best
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* with profiling after the prologue.
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*
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* Neither __mcount nor mcount requires %eax to point to 4 bytes of data,
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* so don't waste space allocating the data or time setting it up. Changes
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* to avoid the wastage in gcc-2.4.5-compiled code are available.
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*
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* mexitcount is a new profiling feature to allow accurate timing of all
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* functions if an accurate clock is available. Changes to gcc-2.4.5 to
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* support it are are available. The changes currently don't allow not
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* generating mexitcounts for non-kernel code. It is best to call
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* mexitcount right at the end of a function like the MEXITCOUNT macro
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* does, but the changes to gcc only implement calling it as the first
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* thing in the epilogue to avoid problems with -fpic.
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*
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* mcount and __mexitcount may clobber the call-used registers and %ef.
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* mexitcount may clobber %ecx and %ef.
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*
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* Cross-jumping makes accurate timing more difficult. It is handled in
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* many cases by calling mexitcount before jumping. It is not handled
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* for some conditional jumps (e.g., in bcopyx) or for some fault-handling
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* jumps. It is handled for some fault-handling jumps by not sharing the
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* exit routine.
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*
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* ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
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* the main entry point. Note that alt entries are counted twice. They
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* have to be counted as ordinary entries for gprof to get the call times
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* right for the ordinary entries.
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*
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* High local labels are used in macros to avoid clashes with local labels
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* in functions.
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*
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* "ret" is used instead of "RET" because there are a lot of "ret"s.
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* 0xc3 is the opcode for "ret" (#define ret ... ret fails because this
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* file is preprocessed in traditional mode). "ret" clobbers eflags
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* but this doesn't matter.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
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#define ENTRY(name) GEN_ENTRY(name) ; 9: ; MCOUNT
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#define FAKE_MCOUNT(caller) pushl caller ; call __mcount ; popl %ecx
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#define MCOUNT call __mcount
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#define MCOUNT_LABEL(name) GEN_ENTRY(name) ; nop ; ALIGN_TEXT
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#define MEXITCOUNT call mexitcount
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#define ret MEXITCOUNT ; .byte 0xc3
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#else /* not GPROF */
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/*
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* ALTENTRY() has to align because it is before a corresponding ENTRY().
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* ENTRY() has to align to because there may be no ALTENTRY() before it.
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* If there is a previous ALTENTRY() then the alignment code for ENTRY()
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* is empty.
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*/
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#define ALTENTRY(name) GEN_ENTRY(name)
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#define ENTRY(name) GEN_ENTRY(name)
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#define FAKE_MCOUNT(caller)
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#define MCOUNT
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#define MCOUNT_LABEL(name)
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#define MEXITCOUNT
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#endif /* GPROF */
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/* XXX NOP and FASTER_NOP are misleadingly named */
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#ifdef DUMMY_NOPS /* this will break some older machines */
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#define FASTER_NOP
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#define NOP
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#else
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#define FASTER_NOP pushl %eax ; inb $0x84,%al ; popl %eax
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#define NOP pushl %eax ; inb $0x84,%al ; inb $0x84,%al ; popl %eax
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#endif
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#else /* !KERNEL */
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#include "/usr/src/lib/libc/i386/DEFS.h" /* XXX blech */
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#ifndef RCSID
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#define RCSID(a)
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#endif
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#endif /* KERNEL */
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#endif /* !_MACHINE_ASMACROS_H_ */
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