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- /*-
- * Copyright (c) 1987 The Regents of the University of California.
- * 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)gmon.c 5.5 (Berkeley) 5/22/91";
- #endif /* not lint */
-
- #include <unistd.h>
- #include "gmon.h"
-
- extern mcount() asm ("mcount");
- extern char *minbrk asm ("minbrk");
-
- /*
- * froms is actually a bunch of unsigned shorts indexing tos
- */
- static int profiling = 3;
- static unsigned short *froms;
- static struct tostruct *tos = 0;
- static long tolimit = 0;
- static char *s_lowpc = 0;
- static char *s_highpc = 0;
- static unsigned long s_textsize = 0;
-
- static int ssiz;
- static char *sbuf;
- static int s_scale;
- /* see profil(2) where this is describe (incorrectly) */
- #define SCALE_1_TO_1 0x10000L
-
- char nospace_msg[] = "No space for profiling buffer(s)\n";
- #define NOSPACE() (void) write(2, nospace_msg, sizeof nospace_msg - 1)
-
- char overflow_msg[] = "mcount: tos overflow\n";
- #define OVERFLOW() (void) write(2, overflow_msg, sizeof overflow_msg - 1)
-
- monstartup(lowpc, highpc)
- char *lowpc;
- char *highpc;
- {
- int monsize;
- char *buffer;
- int o;
- struct phdr *p;
-
- /*
- * Round lowpc and highpc to multiples of the density we're using
- * so the rest of the scaling (here and in gprof) stays in ints.
- */
- lowpc = (char *)
- ROUNDDOWN((unsigned)lowpc, HISTFRACTION*sizeof(HISTCOUNTER));
- s_lowpc = lowpc;
- highpc = (char *)
- ROUNDUP((unsigned)highpc, HISTFRACTION*sizeof(HISTCOUNTER));
- s_highpc = highpc;
- s_textsize = highpc - lowpc;
- monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr);
- monsize = (monsize + 3) & ~3;
- buffer = sbrk(monsize);
- if (buffer == (char *) -1) {
- NOSPACE();
- return;
- }
- froms = (unsigned short *) sbrk(s_textsize / HASHFRACTION);
- if (froms == (unsigned short *) -1) {
- NOSPACE();
- froms = 0;
- return;
- }
- tolimit = s_textsize * ARCDENSITY / 100;
- if (tolimit < MINARCS)
- tolimit = MINARCS;
- else if (tolimit > 65534)
- tolimit = 65534;
- tos = (struct tostruct *) sbrk((tolimit*sizeof(struct tostruct)+3)&~3);
- if (tos == (struct tostruct *) -1) {
- NOSPACE();
- froms = 0;
- tos = 0;
- return;
- }
- minbrk = sbrk(0);
- tos[0].link = 0;
- sbuf = buffer;
- ssiz = monsize;
- p = (struct phdr *) buffer;
- p->lpc = lowpc;
- p->hpc = highpc;
- p->ncnt = ssiz;
- monsize -= sizeof(struct phdr);
- if (monsize <= 0)
- return;
- o = highpc - lowpc;
- if(monsize < o)
- s_scale = ((float) monsize / o) * SCALE_1_TO_1;
- else
- s_scale = SCALE_1_TO_1;
- moncontrol(1);
- }
-
- _mcleanup()
- {
- int fd;
- int fromindex;
- int endfrom;
- char *frompc;
- int toindex;
- struct rawarc rawarc;
-
- moncontrol(0);
- fd = creat("gmon.out", 0666);
- if (fd < 0) {
- perror("mcount: gmon.out");
- return;
- }
- (void) write(fd, sbuf, ssiz);
- endfrom = s_textsize / (HASHFRACTION * sizeof(*froms));
- for (fromindex = 0; fromindex < endfrom; fromindex++) {
- if (froms[fromindex] == 0)
- continue;
- frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms));
- for (toindex = froms[fromindex];
- toindex != 0;
- toindex = tos[toindex].link) {
- rawarc.raw_frompc = (unsigned long) frompc;
- rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;
- rawarc.raw_count = tos[toindex].count;
- (void) write(fd, &rawarc, sizeof rawarc);
- }
- }
- close(fd);
- }
-
- mcount(cntpa)
- long **cntpa;
- {
- register char *selfpc;
- register unsigned short *frompcindex;
- register struct tostruct *top;
- register struct tostruct *prevtop;
- register long toindex;
-
- /*
- * Find the return address for mcount,
- * and address of counter pointer.
- */
- selfpc = *((char **)&cntpa-3); /* -8(fp) */
- frompcindex = (unsigned short *)(*((((long *)*((char **)&cntpa-1)))-2));
-
- /*
- * Check that we are profiling
- * and that we aren't recursively invoked.
- */
- if (profiling)
- return;
- profiling++;
-
- /*
- * Check that frompcindex is a reasonable pc value.
- * for example: signal catchers get called from the stack,
- * not from text space. too bad.
- */
- frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc);
- if ((unsigned long)frompcindex > s_textsize)
- goto done;
- frompcindex =
- &froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))];
-
- toindex = *frompcindex;
- if (toindex == 0) {
- /*
- * First time traversing this arc
- */
- toindex = ++tos[0].link;
- if (toindex >= tolimit) {
- profiling++; /* stop profiling */
- OVERFLOW();
- return;
- }
- *frompcindex = toindex;
- top = &tos[toindex];
- top->selfpc = selfpc;
- top->count = 1;
- top->link = 0;
- goto done;
- }
- top = &tos[toindex];
- if (top->selfpc == selfpc) {
- /*
- * Arc at front of chain; usual case.
- */
- top->count++;
- goto done;
- }
-
- /*
- * Have to go looking down chain for it.
- * top points to what we are looking at,
- * prevtop points to previous top.
- * We know it is not at the head of the chain.
- */
- for (;;) {
- if (top->link == 0) {
- /*
- * top is end of the chain and none of the chain
- * had top->selfpc == selfpc,
- * so we allocate a new tostruct
- * and link it to the head of the chain.
- */
- toindex = ++tos[0].link;
- if (toindex >= tolimit) {
- profiling++; /* stop profiling */
- OVERFLOW();
- return;
- }
- top = &tos[toindex];
- top->selfpc = selfpc;
- top->count = 1;
- top->link = *frompcindex;
- *frompcindex = toindex;
- goto done;
- }
- /*
- * Otherwise, check the next arc on the chain.
- */
- prevtop = top;
- top = &tos[top->link];
- if (top->selfpc == selfpc) {
- /*
- * There it is.
- * Increment its count and
- * move it to the head of the chain.
- */
- top->count++;
- toindex = prevtop->link;
- prevtop->link = top->link;
- top->link = *frompcindex;
- *frompcindex = toindex;
- goto done;
- }
-
- }
- done:
- profiling--;
- return;
- }
-
- /*
- * While profiling is enabled, we set the variable 'profiling' to indicate
- * that all the data structures are ready.
- */
- moncontrol(mode)
- int mode;
- {
- if (mode) {
- /* start */
- profil(sbuf + sizeof(struct phdr), ssiz - sizeof(struct phdr),
- (int)s_lowpc, s_scale);
- profiling = 0;
- } else {
- /* stop */
- profil((char *)0, 0, 0, 0);
- profiling = 3;
- }
- }
-