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- #ifndef lint
- static char sccsid[] = "@(#)gmon.c 1.1 86/02/03 SMI";
- #endif
-
- #ifdef DEBUG
- #include <stdio.h>
- #endif DEBUG
-
- #include "gmon.h"
-
- /*
- * froms is actually a bunch of unsigned shorts indexing tos
- */
- extern char profiling;
-
- unsigned short *froms;
- struct tostruct *tos = 0;
- long tolimit = 0;
- char *s_lowpc = 0;
- char *s_highpc = 0;
- unsigned long s_textsize = 0;
- int s_scale;
- char *minsbrk = 0;
-
- static int ssiz;
- static int *sbuf;
-
- #define MSG "No space for monitor buffer(s)\n"
-
- monstartup(lowpc, highpc)
- char *lowpc;
- char *highpc;
- {
- int monsize;
- char *buffer;
- char *sbrk();
-
- /*
- * 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);
- buffer = sbrk( monsize );
- if ( buffer == (char *) -1 ) {
- write( 2 , MSG , sizeof(MSG) );
- return;
- }
- froms = (unsigned short *) sbrk( s_textsize / HASHFRACTION );
- if ( froms == (unsigned short *) -1 ) {
- write( 2 , MSG , sizeof(MSG) );
- 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 ) );
- if ( tos == (struct tostruct *) -1 ) {
- write( 2 , MSG , sizeof(MSG) );
- froms = 0;
- tos = 0;
- return;
- }
- minsbrk = sbrk(0);
- tos[0].link = 0;
- monitor( lowpc , highpc , buffer , monsize , tolimit );
- }
-
- _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;
- }
- # ifdef DEBUG
- fprintf( stderr , "[mcleanup] sbuf 0x%x ssiz %d\n" , sbuf , ssiz );
- # endif DEBUG
- 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) {
- # ifdef DEBUG
- fprintf( stderr ,
- "[mcleanup] frompc 0x%x selfpc 0x%x count %d\n" ,
- frompc , tos[toindex].selfpc , tos[toindex].count );
- # endif DEBUG
- rawarc.raw_frompc = (unsigned long) frompc;
- rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;
- rawarc.raw_count = tos[toindex].count;
- write( fd , &rawarc , sizeof rawarc );
- }
- }
- close( fd );
- }
-
- #if vax
-
- asm(".text");
- asm("#the beginning of mcount()");
- asm(".data");
- mcount()
- {
- register char *selfpc; /* r11 => r5 */
- register unsigned short *frompcindex; /* r10 => r4 */
- register struct tostruct *top; /* r9 => r3 */
- register struct tostruct *prevtop; /* r8 => r2 */
- register long toindex; /* r7 => r1 */
-
- #ifdef lint
- selfpc = (char *)0;
- frompcindex = 0;
- #else not lint
- /*
- * find the return address for mcount,
- * and the return address for mcount's caller.
- */
- asm(" .text"); /* make sure we're in text space */
- asm(" movl (sp), r11"); /* selfpc = ... (jsb frame) */
- asm(" movl 16(fp), r10"); /* frompcindex = (calls frame) */
- #endif not lint
- /*
- * check that we are profiling
- * and that we aren't recursively invoked.
- */
- if (profiling) {
- goto out;
- }
- 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) {
- goto overflow;
- }
- *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 (; /* goto done */; ) {
- 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) {
- goto overflow;
- }
- 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
- * 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--;
- /* and fall through */
- out:
- asm(" rsb");
-
- overflow:
- profiling++; /* halt further profiling */
- # define TOLIMIT "mcount: tos overflow\n"
- write(2, TOLIMIT, sizeof(TOLIMIT));
- goto out;
- }
- asm(".text");
- asm("#the end of mcount()");
- asm(".data");
-
- #endif vax
-
- /*VARARGS1*/
- monitor( lowpc , highpc , buf , bufsiz , nfunc )
- char *lowpc;
- char *highpc;
- int *buf, bufsiz;
- int nfunc; /* not used, available for compatability only */
- {
- register o;
-
- if ( lowpc == 0 ) {
- moncontrol(0);
- _mcleanup();
- return;
- }
- sbuf = buf;
- ssiz = bufsiz;
- ( (struct phdr *) buf ) -> lpc = lowpc;
- ( (struct phdr *) buf ) -> hpc = highpc;
- ( (struct phdr *) buf ) -> ncnt = ssiz;
- o = sizeof(struct phdr);
- buf = (int *) ( ( (int) buf ) + o );
- bufsiz -= o;
- if ( bufsiz <= 0 )
- return;
- o = ( ( (char *) highpc - (char *) lowpc) );
- if( bufsiz < o )
- s_scale = ( (float) bufsiz / o ) * 65536;
- else
- s_scale = 65536;
- moncontrol(1);
- }
-
- /*
- * Control profiling
- * profiling is what mcount checks to see if
- * all the data structures are ready.
- */
- moncontrol(mode)
- int mode;
- {
- if (mode) {
- /* start */
- profil((char*) sbuf + sizeof(struct phdr), ssiz - sizeof(struct phdr),
- s_lowpc, s_scale);
- profiling = 0;
- } else {
- /* stop */
- profil((char *)0, 0, 0, 0);
- profiling = 3;
- }
- }
-
-
- #if vax
-
- /*
- * This is a stub for the "brk" system call, which we want to
- * catch so that it will not deallocate our data space.
- * (of which the program is not aware)
- */
- extern char *curbrk;
-
- brk(addr)
- char *addr;
- {
-
- if (addr < minsbrk)
- addr = minsbrk;
- asm(" chmk $17");
- asm(" jcc 1f");
- asm(" jmp cerror");
- asm("1:");
- curbrk = addr;
- return (0);
- }
- #endif
-