423 lines
12 KiB
C
423 lines
12 KiB
C
/*-
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* Copyright (c) 1991 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. [rescinded 22 July 1999]
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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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/* Mangled into a form that works on Sparc Solaris 2 by Mark Eichin
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* for Cygnus Support, July 1992.
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*/
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#include "config.h"
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#include "system.h"
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#if 0
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#include "sparc/gmon.h"
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#else
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struct phdr {
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char *lpc;
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char *hpc;
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int ncnt;
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};
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#define HISTFRACTION 2
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#define HISTCOUNTER unsigned short
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#define HASHFRACTION 1
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#define ARCDENSITY 2
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#define MINARCS 50
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struct tostruct {
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char *selfpc;
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long count;
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unsigned short link;
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};
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struct rawarc {
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unsigned long raw_frompc;
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unsigned long raw_selfpc;
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long raw_count;
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};
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#define ROUNDDOWN(x,y) (((x)/(y))*(y))
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#define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
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#endif
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/* extern mcount() asm ("mcount"); */
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/*extern*/ char *minbrk /* asm ("minbrk") */;
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/*
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* froms is actually a bunch of unsigned shorts indexing tos
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*/
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static int profiling = 3;
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static unsigned short *froms;
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static struct tostruct *tos = 0;
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static long tolimit = 0;
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static char *s_lowpc = 0;
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static char *s_highpc = 0;
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static unsigned long s_textsize = 0;
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static int ssiz;
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static char *sbuf;
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static int s_scale;
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/* see profil(2) where this is describe (incorrectly) */
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#define SCALE_1_TO_1 0x10000L
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#define MSG "No space for profiling buffer(s)\n"
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static void moncontrol PARAMS ((int));
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extern void monstartup PARAMS ((char *, char *));
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extern void _mcleanup PARAMS ((void));
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void monstartup(lowpc, highpc)
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char *lowpc;
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char *highpc;
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{
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int monsize;
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char *buffer;
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register int o;
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/*
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* round lowpc and highpc to multiples of the density we're using
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* so the rest of the scaling (here and in gprof) stays in ints.
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*/
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lowpc = (char *)
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ROUNDDOWN((unsigned long)lowpc, HISTFRACTION*sizeof(HISTCOUNTER));
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s_lowpc = lowpc;
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highpc = (char *)
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ROUNDUP((unsigned long)highpc, HISTFRACTION*sizeof(HISTCOUNTER));
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s_highpc = highpc;
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s_textsize = highpc - lowpc;
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monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr);
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buffer = sbrk( monsize );
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if ( buffer == (char *) -1 ) {
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write( 2 , MSG , sizeof(MSG) );
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return;
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}
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froms = (unsigned short *) sbrk( s_textsize / HASHFRACTION );
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if ( froms == (unsigned short *) -1 ) {
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write( 2 , MSG , sizeof(MSG) );
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froms = 0;
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return;
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}
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tolimit = s_textsize * ARCDENSITY / 100;
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if ( tolimit < MINARCS ) {
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tolimit = MINARCS;
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} else if ( tolimit > 65534 ) {
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tolimit = 65534;
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}
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tos = (struct tostruct *) sbrk( tolimit * sizeof( struct tostruct ) );
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if ( tos == (struct tostruct *) -1 ) {
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write( 2 , MSG , sizeof(MSG) );
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froms = 0;
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tos = 0;
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return;
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}
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minbrk = sbrk(0);
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tos[0].link = 0;
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sbuf = buffer;
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ssiz = monsize;
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( (struct phdr *) buffer ) -> lpc = lowpc;
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( (struct phdr *) buffer ) -> hpc = highpc;
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( (struct phdr *) buffer ) -> ncnt = ssiz;
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monsize -= sizeof(struct phdr);
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if ( monsize <= 0 )
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return;
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o = highpc - lowpc;
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if( monsize < o )
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#ifndef hp300
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s_scale = ( (float) monsize / o ) * SCALE_1_TO_1;
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#else /* avoid floating point */
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{
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int quot = o / monsize;
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if (quot >= 0x10000)
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s_scale = 1;
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else if (quot >= 0x100)
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s_scale = 0x10000 / quot;
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else if (o >= 0x800000)
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s_scale = 0x1000000 / (o / (monsize >> 8));
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else
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s_scale = 0x1000000 / ((o << 8) / monsize);
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}
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#endif
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else
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s_scale = SCALE_1_TO_1;
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moncontrol(1);
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}
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void
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_mcleanup()
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{
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int fd;
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int fromindex;
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int endfrom;
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char *frompc;
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int toindex;
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struct rawarc rawarc;
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char *profdir;
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const char *proffile;
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char *progname;
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char buf[PATH_MAX];
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extern char **___Argv;
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moncontrol(0);
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if ((profdir = getenv("PROFDIR")) != NULL) {
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/* If PROFDIR contains a null value, no profiling output is produced */
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if (*profdir == '\0') {
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return;
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}
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progname=strrchr(___Argv[0], '/');
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if (progname == NULL)
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progname=___Argv[0];
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else
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progname++;
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sprintf(buf, "%s/%ld.%s", profdir, (long) getpid(), progname);
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proffile = buf;
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} else {
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proffile = "gmon.out";
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}
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fd = creat( proffile, 0666 );
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if ( fd < 0 ) {
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perror( proffile );
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return;
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}
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# ifdef DEBUG
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fprintf( stderr , "[mcleanup] sbuf 0x%x ssiz %d\n" , sbuf , ssiz );
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# endif /* DEBUG */
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write( fd , sbuf , ssiz );
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endfrom = s_textsize / (HASHFRACTION * sizeof(*froms));
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for ( fromindex = 0 ; fromindex < endfrom ; fromindex++ ) {
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if ( froms[fromindex] == 0 ) {
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continue;
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}
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frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms));
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for (toindex=froms[fromindex]; toindex!=0; toindex=tos[toindex].link) {
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# ifdef DEBUG
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fprintf( stderr ,
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"[mcleanup] frompc 0x%x selfpc 0x%x count %d\n" ,
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frompc , tos[toindex].selfpc , tos[toindex].count );
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# endif /* DEBUG */
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rawarc.raw_frompc = (unsigned long) frompc;
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rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;
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rawarc.raw_count = tos[toindex].count;
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write( fd , &rawarc , sizeof rawarc );
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}
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}
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close( fd );
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}
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/*
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* The Sparc stack frame is only held together by the frame pointers
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* in the register windows. According to the SVR4 SPARC ABI
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* Supplement, Low Level System Information/Operating System
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* Interface/Software Trap Types, a type 3 trap will flush all of the
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* register windows to the stack, which will make it possible to walk
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* the frames and find the return addresses.
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* However, it seems awfully expensive to incur a trap (system
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* call) for every function call. It turns out that "call" simply puts
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* the return address in %o7 expecting the "save" in the procedure to
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* shift it into %i7; this means that before the "save" occurs, %o7
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* contains the address of the call to mcount, and %i7 still contains
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* the caller above that. The asm mcount here simply saves those
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* registers in argument registers and branches to internal_mcount,
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* simulating a call with arguments.
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* Kludges:
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* 1) the branch to internal_mcount is hard coded; it should be
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* possible to tell asm to use the assembler-name of a symbol.
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* 2) in theory, the function calling mcount could have saved %i7
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* somewhere and reused the register; in practice, I *think* this will
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* break longjmp (and maybe the debugger) but I'm not certain. (I take
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* some comfort in the knowledge that it will break the native mcount
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* as well.)
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* 3) if builtin_return_address worked, this could be portable.
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* However, it would really have to be optimized for arguments of 0
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* and 1 and do something like what we have here in order to avoid the
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* trap per function call performance hit.
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* 4) the atexit and monsetup calls prevent this from simply
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* being a leaf routine that doesn't do a "save" (and would thus have
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* access to %o7 and %i7 directly) but the call to write() at the end
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* would have also prevented this.
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*
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* -- [eichin:19920702.1107EST]
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*/
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static void internal_mcount PARAMS ((char *, unsigned short *)) ATTRIBUTE_UNUSED;
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/* i7 == last ret, -> frompcindex */
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/* o7 == current ret, -> selfpc */
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/* Solaris 2 libraries use _mcount. */
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asm(".global _mcount; _mcount: mov %i7,%o1; mov %o7,%o0;b,a internal_mcount");
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/* This is for compatibility with old versions of gcc which used mcount. */
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asm(".global mcount; mcount: mov %i7,%o1; mov %o7,%o0;b,a internal_mcount");
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static void internal_mcount(selfpc, frompcindex)
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register char *selfpc;
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register unsigned short *frompcindex;
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{
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register struct tostruct *top;
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register struct tostruct *prevtop;
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register long toindex;
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static char already_setup;
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/*
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* find the return address for mcount,
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* and the return address for mcount's caller.
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*/
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if(!already_setup) {
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extern char etext[];
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already_setup = 1;
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monstartup(0, (char *)etext);
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#ifdef USE_ONEXIT
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on_exit(_mcleanup, 0);
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#else
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atexit(_mcleanup);
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#endif
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}
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/*
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* check that we are profiling
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* and that we aren't recursively invoked.
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*/
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if (profiling) {
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goto out;
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}
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profiling++;
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/*
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* check that frompcindex is a reasonable pc value.
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* for example: signal catchers get called from the stack,
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* not from text space. too bad.
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*/
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frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc);
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if ((unsigned long)frompcindex > s_textsize) {
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goto done;
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}
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frompcindex =
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&froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))];
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toindex = *frompcindex;
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if (toindex == 0) {
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/*
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* first time traversing this arc
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*/
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toindex = ++tos[0].link;
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if (toindex >= tolimit) {
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goto overflow;
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}
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*frompcindex = toindex;
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top = &tos[toindex];
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top->selfpc = selfpc;
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top->count = 1;
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top->link = 0;
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goto done;
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}
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top = &tos[toindex];
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if (top->selfpc == selfpc) {
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/*
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* arc at front of chain; usual case.
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*/
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top->count++;
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goto done;
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}
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/*
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* have to go looking down chain for it.
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* top points to what we are looking at,
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* prevtop points to previous top.
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* we know it is not at the head of the chain.
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*/
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for (; /* goto done */; ) {
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if (top->link == 0) {
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/*
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* top is end of the chain and none of the chain
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* had top->selfpc == selfpc.
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* so we allocate a new tostruct
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* and link it to the head of the chain.
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*/
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toindex = ++tos[0].link;
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if (toindex >= tolimit) {
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goto overflow;
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}
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top = &tos[toindex];
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top->selfpc = selfpc;
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top->count = 1;
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top->link = *frompcindex;
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*frompcindex = toindex;
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goto done;
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}
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/*
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* otherwise, check the next arc on the chain.
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*/
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prevtop = top;
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top = &tos[top->link];
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if (top->selfpc == selfpc) {
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/*
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* there it is.
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* increment its count
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* move it to the head of the chain.
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*/
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top->count++;
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toindex = prevtop->link;
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prevtop->link = top->link;
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top->link = *frompcindex;
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*frompcindex = toindex;
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goto done;
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}
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}
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done:
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profiling--;
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/* and fall through */
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out:
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return; /* normal return restores saved registers */
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overflow:
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profiling++; /* halt further profiling */
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# define TOLIMIT "mcount: tos overflow\n"
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write(2, TOLIMIT, sizeof(TOLIMIT));
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goto out;
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}
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/*
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* Control profiling
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* profiling is what mcount checks to see if
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* all the data structures are ready.
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*/
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static void moncontrol(mode)
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int mode;
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{
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if (mode) {
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/* start */
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profil((unsigned short *)(sbuf + sizeof(struct phdr)),
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ssiz - sizeof(struct phdr),
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(long)s_lowpc, s_scale);
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profiling = 0;
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} else {
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/* stop */
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profil((unsigned short *)0, 0, 0, 0);
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profiling = 3;
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}
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}
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