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mon.c
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C/C++ Source or Header
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1990-11-05
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5KB
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210 lines
/*
* mon.c
*
*
* Profiling stuff for the decStation.
*
*
*/
#include "gmon.h"
extern void monitor();
extern void moncontrol();
/*
*----------------------------------------------------------------------
*
* _mcount --
*
* This is supposed to record each procedure call, so that gprof
* can print a call graph. But it is just a null procedure because
* the mips compiler doesn't use a frame pointer.
*
* Once we switch over to gcc, we will have a frame pointer, and
* we will be able to look at the stack and find out who the caller
* was.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
_mcount()
{
return;
}
/*
* 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 );
}
/*VARARGS1*/
void
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.
*/
void
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;
}
return;
}