4.3BSD-Tahoe/usr/src/ucb/gprof/tahoe.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)tahoe.c 1.4 (Berkeley) 6/29/88";
#endif /* not lint */
#include "gprof.h"
/*
* a namelist entry to be the child of indirect callf
*/
nltype indirectchild = {
"(*)" , /* the name */
(unsigned long) 0 , /* the pc entry point */
(unsigned long) 0 , /* entry point aligned to histogram */
(double) 0.0 , /* ticks in this routine */
(double) 0.0 , /* cumulative ticks in children */
(long) 0 , /* how many times called */
(long) 0 , /* how many calls to self */
(double) 1.0 , /* propagation fraction */
(double) 0.0 , /* self propagation time */
(double) 0.0 , /* child propagation time */
(bool) 0 , /* print flag */
(int) 0 , /* index in the graph list */
(int) 0 , /* graph call chain top-sort order */
(int) 0 , /* internal number of cycle on */
(struct nl *) &indirectchild , /* pointer to head of cycle */
(struct nl *) 0 , /* pointer to next member of cycle */
(arctype *) 0 , /* list of caller arcs */
(arctype *) 0 /* list of callee arcs */
};
operandenum
operandmode( modep )
unsigned char *modep;
{
long usesreg = ((long)*modep) & 0xf;
switch ( ((long)*modep) >> 4 ) {
case 0:
case 1:
case 2:
case 3:
return literal;
case 4:
return indexed;
case 5:
return reg;
case 6:
return regdef;
case 7:
return autodec;
case 8:
return ( usesreg != 0xe ? autoinc : immediate );
case 9:
return ( usesreg != PC ? autoincdef : absolute );
case 10:
return ( usesreg != PC ? bytedisp : byterel );
case 11:
return ( usesreg != PC ? bytedispdef : bytereldef );
case 12:
return ( usesreg != PC ? worddisp : wordrel );
case 13:
return ( usesreg != PC ? worddispdef : wordreldef );
case 14:
return ( usesreg != PC ? longdisp : longrel );
case 15:
return ( usesreg != PC ? longdispdef : longreldef );
}
/* NOTREACHED */
}
char *
operandname( mode )
operandenum mode;
{
switch ( mode ) {
case literal:
return "literal";
case indexed:
return "indexed";
case reg:
return "register";
case regdef:
return "register deferred";
case autodec:
return "autodecrement";
case autoinc:
return "autoincrement";
case autoincdef:
return "autoincrement deferred";
case bytedisp:
return "byte displacement";
case bytedispdef:
return "byte displacement deferred";
case byterel:
return "byte relative";
case bytereldef:
return "byte relative deferred";
case worddisp:
return "word displacement";
case worddispdef:
return "word displacement deferred";
case wordrel:
return "word relative";
case wordreldef:
return "word relative deferred";
case immediate:
return "immediate";
case absolute:
return "absolute";
case longdisp:
return "long displacement";
case longdispdef:
return "long displacement deferred";
case longrel:
return "long relative";
case longreldef:
return "long relative deferred";
}
/* NOTREACHED */
}
long
operandlength( modep )
unsigned char *modep;
{
switch ( operandmode( modep ) ) {
case literal:
case reg:
case regdef:
case autodec:
case autoinc:
case autoincdef:
return 1;
case bytedisp:
case bytedispdef:
case byterel:
case bytereldef:
return 2;
case worddisp:
case worddispdef:
case wordrel:
case wordreldef:
return 3;
case immediate:
case absolute:
case longdisp:
case longdispdef:
case longrel:
case longreldef:
return 5;
case indexed:
return 1+operandlength( modep + 1 );
}
/* NOTREACHED */
}
unsigned long
reladdr( modep )
char *modep;
{
operandenum mode = operandmode( modep );
char *cp;
short *sp;
long *lp;
int i;
long value = 0;
cp = modep;
cp += 1; /* skip over the mode */
switch ( mode ) {
default:
fprintf( stderr , "[reladdr] not relative address\n" );
return (unsigned long) modep;
case byterel:
return (unsigned long) ( cp + sizeof *cp + *cp );
case wordrel:
for (i = 0; i < sizeof *sp; i++)
value = (value << 8) + (cp[i] & 0xff);
return (unsigned long) ( cp + sizeof *sp + value );
case longrel:
for (i = 0; i < sizeof *lp; i++)
value = (value << 8) + (cp[i] & 0xff);
return (unsigned long) ( cp + sizeof *lp + value );
}
}
findcall( parentp , p_lowpc , p_highpc )
nltype *parentp;
unsigned long p_lowpc;
unsigned long p_highpc;
{
unsigned char *instructp;
long length;
nltype *childp;
operandenum mode;
operandenum firstmode;
unsigned long destpc;
if ( textspace == 0 ) {
return;
}
if ( p_lowpc < s_lowpc ) {
p_lowpc = s_lowpc;
}
if ( p_highpc > s_highpc ) {
p_highpc = s_highpc;
}
# ifdef DEBUG
if ( debug & CALLDEBUG ) {
printf( "[findcall] %s: 0x%x to 0x%x\n" ,
parentp -> name , p_lowpc , p_highpc );
}
# endif DEBUG
for ( instructp = textspace + p_lowpc ;
instructp < textspace + p_highpc ;
instructp += length ) {
length = 1;
if ( *instructp == CALLF ) {
/*
* maybe a callf, better check it out.
* skip the count of the number of arguments.
*/
# ifdef DEBUG
if ( debug & CALLDEBUG ) {
printf( "[findcall]\t0x%x:callf" , instructp - textspace );
}
# endif DEBUG
firstmode = operandmode( instructp+length );
switch ( firstmode ) {
case literal:
case immediate:
break;
default:
goto botched;
}
length += operandlength( instructp+length );
mode = operandmode( instructp + length );
# ifdef DEBUG
if ( debug & CALLDEBUG ) {
printf( "\tfirst operand is %s", operandname( firstmode ) );
printf( "\tsecond operand is %s\n" , operandname( mode ) );
}
# endif DEBUG
switch ( mode ) {
case regdef:
case bytedispdef:
case worddispdef:
case longdispdef:
case bytereldef:
case wordreldef:
case longreldef:
/*
* indirect call: call through pointer
* either *d(r) as a parameter or local
* (r) as a return value
* *f as a global pointer
* [are there others that we miss?,
* e.g. arrays of pointers to functions???]
*/
addarc( parentp , &indirectchild , (long) 0 );
length += operandlength( instructp + length );
continue;
case byterel:
case wordrel:
case longrel:
/*
* regular pc relative addressing
* check that this is the address of
* a function.
*/
destpc = reladdr( instructp+length )
- (unsigned long) textspace;
if ( destpc >= s_lowpc && destpc <= s_highpc ) {
childp = nllookup( destpc );
# ifdef DEBUG
if ( debug & CALLDEBUG ) {
printf( "[findcall]\tdestpc 0x%x" , destpc );
printf( " childp->name %s" , childp -> name );
printf( " childp->value 0x%x\n" ,
childp -> value );
}
# endif DEBUG
if ( childp -> value == destpc ) {
/*
* a hit
*/
addarc( parentp , childp , (long) 0 );
length += operandlength( instructp + length );
continue;
}
goto botched;
}
/*
* else:
* it looked like a callf,
* but it wasn't to anywhere.
*/
goto botched;
default:
botched:
/*
* something funny going on.
*/
# ifdef DEBUG
if ( debug & CALLDEBUG ) {
printf( "[findcall]\tbut it's a botch\n" );
}
# endif DEBUG
length = 1;
continue;
}
}
}
}