4.4BSD/usr/src/old/sdb/display.c
static char sccsid[] = "@(#)display.c 4.3 8/17/82";
#include "head.h"
#include <a.out.h>
#include <stab.h>
#include "cdefs.h"
struct user u;
BKPTR bkpthead;
#ifdef FLEXNAMES
#define bread(a,b,c) stread(b,c)
#define blseek(a,b,c) stseek(b,c)
#endif
/* initialize frame pointers to top of call stack */
/* MACHINE DEPENDENT */
struct proct *
initframe() {
argp = *(ADDR *) (((ADDR) &u) + AP);
frame = *(ADDR *) (((ADDR) &u) + FP);
callpc = *(ADDR *) (((ADDR) &u) + PC);
if ((frame == 0) || (frame & 0xf0000000 != 0x70000000))
return(badproc);
return(adrtoprocp(callpc++)); /* ++ because UNIX backs up instrs */
}
struct proct *
nextframe() {
callpc = get(frame+16, DSP);
argp = get(frame+8, DSP);
frame = get(frame+12, DSP) & EVEN;
if (callpc > 0x70000000) {
/* error handler kludge */
callpc = get(frame+64, DSP);
argp = get(frame+8, DSP);
frame = get(frame+12, DSP) & EVEN;
}
if ((frame == 0) || (frame & 0xf0000000 != 0x70000000))
return(badproc);
return(adrtoprocp(callpc-1));
}
/* returns core image address for variable */
/* MACHINE DEPENDENT */
ADDR
formaddr(class, addr)
u_char class;
ADDR addr; {
if (debug) printf("formaddr(%o, %d)\n", class & 0377, addr);
switch(class & STABMASK) {
case N_RSYM:
return(stackreg(addr));
case N_GSYM:
case N_SSYM:
case N_STSYM:
case N_LCSYM:
return(addr);
case N_PSYM:
return(argp+addr);
case N_LSYM:
return(frame+addr);
default:
printf("Bad class in formaddr: 0%o",
class & 0377);
return(0);
}
}
char class;
/*
* stackreg(reg):
* If the register for the current frame is somewhere on the stack
* then return the address of where it is, otherwise its still in
* the register so return the register number.
* We distinguish the two by noting that register numbers are less
* than 16 and that stack addresses are greater.
*
* MACHINE DEPENDENT
*/
ADDR
stackreg(reg) {
register int curframe, regfl, mask, i;
struct proct *procp;
ADDR regaddr;
curframe = frame;
regaddr = reg;
regfl = 0x10000 << reg;
for (procp=initframe(); frame!=curframe; procp=nextframe()) {
if (procp == badproc) {
error("Stackreg error: frame");
return(-1);
}
mask = get(frame+4, DSP);
if (mask & regfl) {
regaddr = frame + 20;
for (i=0; i<reg; i++) {
if (mask & 0x10000)
regaddr += WORDSIZE;
mask = mask >> 1;
}
if (!(mask & 0x10000)) {
error("Stackreg error: contents");
return(-1);
}
}
}
return(regaddr);
}
/* returns address of proc:var. Sets externals class and subflag */
ADDR
varaddr(proc, var)
char *proc, *var; {
return(findvar(proc, var, "", 0));
}
/*
* displays values of variables matching proc:var,
* returns its address
*/
ADDR
dispvar(proc, var, fmt)
char *proc, *var, *fmt; {
return(findvar(proc, var, fmt, 1));
}
/*
* Find and print values of all variables matching proc:var
* using specified format.
* Returns address of last matching variable.
*
* prvar==0 => no output,
* prvar==1 => output value,
* prvar==2 => output addr
*/
ADDR
findvar(proc, var, fmt, prvar)
char *proc, *var, *fmt; {
ADDR addr = -1, a = -1;
int metaflag = 0, match=0, nullflag=0, depthcnt = -1;
char *comblk;
register struct proct *procp;
if (percentflag) { /* kludge for register names */
return(regout(var, prvar, fmt));
}
if (var[0] == '\0') {
error("Unexpected null variable name");
return(-1);
}
metaflag = eqany('*', proc) || eqany('?', proc) ||
eqany('*', var) || eqany('?', var);
if (proc[0] == '\0') {
nullflag++;
proc = curproc()->pname;
}
comblk = colonflag ? "" : "*";
if (integ && !eqany(var[0], "->.[")) {
depthcnt = integ;
}
if (integ) {
if (eqany(var[0], "->.["))
match++;
else
depthcnt = integ;
}
procp = initframe();
if (!eqany(var[0], "->.[") && !(nullflag && colonflag)) {
do {
if (eqpat(proc, procp->pname)) {
match++;
if (--depthcnt==0 || integ==0) {
a = outvar(procp->pname, var, fmt,
metaflag, integ, N_GSYM,
0, prname, comblk, prvar);
if (a != -1)
addr = a;
if (depthcnt == 0)
break;
}
}
} while ((procp=nextframe()) != badproc);
}
if ((colonflag || metaflag || a == -1) &&
(nullflag || eqpat(proc, ""))) {
a = outvar("", var, fmt, metaflag, integ,
N_GSYM, 0, prname, comblk, prvar);
if (a != -1) {
addr = a;
match++;
}
}
if (match==0 && colonflag) {
procp = initframe();
do {
if (eqstr(curproc()->pname, procp->pname))
break;
} while ((procp=nextframe()) != badproc);
a = outvar(curproc()->pname, var, fmt, metaflag,
integ, N_GSYM, 0, prname,
nullflag ? "_BLNK_" : proc, prvar);
if (a != -1) {
addr = a;
match++;
}
}
if (addr == -1 && match == 0) {
addr = extoutvar(var, fmt, metaflag, prvar);
if (addr != -1)
return(addr);
}
if (match == 0) {
printf("%s not an active procedure\n", proc);
return(-1);
}
if (addr == -1) {
if (var[0] == '.')
var++;
if (proc[0])
#ifndef FLEXNAMES
printf("%.16s:%s not found\n", proc, var);
#else
printf("%s:%s not found\n", proc, var);
#endif
else
printf("%s not found\n", var);
return(-1);
}
return(addr);
}
char *
typetodesc(type, subflag)
short type; {
register int ptr, ftn, ary;
register char *desc;
static char *typedesc[] = {
"d", /* undef */
"d", /* farg */
"c", /* char */
"hd", /* short */
"d", /* int */
"ld", /* long */
"f", /* float */
"g", /* double */
"d", /* strty */
"d", /* unionty */
"d", /* enumty */
"d", /* moety */
"bu", /* uchar */
"hu", /* ushort */
"u", /* unsigned */
"lu", /* ulong */
"d" /* ? */
};
ptr = ftn = ary = 0;
desc = typedesc[type&BTMASK];
for (; type & TMASK; type = DECREF(type)) {
if (ISPTR(type)) ptr++;
else if (ISFTN(type)) ftn++;
else if (ISARY(type)) ary++;
}
if ((ptr-subflag == 1 || ary-subflag == 1) && desc[0] == 'c')
return("s");
if (debug)
printf ("PTR %d; FTN %d; ARY %d; DESC %s\n",ptr,ftn,ary,desc);
if (ptr + ary == subflag)
return(desc);
if (ptr) return("x");
if (ptr==1 && ftn==1) return("p");
return(desc);
}
typetosize(type, stsize)
short type; {
register int ptr, ftn, ary;
register int size;
static char typesize[] = {
4, /* undef */
4, /* farg */
1, /* char */
2, /* short */
WORDSIZE, /* int */
4, /* long */
4, /* float */
8, /* double */
0, /* strty */
0, /* unionty */
4, /* enumty */
4, /* moety */
1, /* uchar */
2, /* ushort */
4, /* unsigned */
4, /* ulong */
4 /* ? */
};
ptr = ftn = ary = 0;
size = typesize[type&BTMASK];
for (; type & TMASK; type = DECREF(type)) {
if (ISPTR(type)) ptr++;
else if (ISFTN(type)) ftn++;
else if (ISARY(type)) ary++;
}
if (debug)
printf ("PTR %d; FTN %d; ARY %d; SIZE %d; STSIZE %d\n",
ptr,ftn,ary,size,stsize);
if (ptr>1) return(4);
if (size == 0) return(stsize);
else return(size);
}
/* print breakpoints */
prbkpt() {
register BKPTR bkptr;
register int cnt;
char *cmdp;
cnt = 0;
for (bkptr = bkpthead; bkptr; bkptr=bkptr->nxtbkpt)
if (bkptr->flag) {
cnt++;
printbkpt("", adrtoprocp(bkptr->loc), bkptr->loc);
cmdp = bkptr->comm;
if (*cmdp != '\n') {
printf(" <");
while (*cmdp != '\n')
printf("%c", *cmdp++);
printf(">\n");
}
else
printf("\n");
}
if (cnt == 0)
printf("No breakpoints set\n");
}
/* interactively delete breakpoints */
idbkpt() {
register BKPTR bkptr;
register int yesflg, cnt;
char c;
cnt = 0;
for (bkptr = bkpthead; bkptr; bkptr=bkptr->nxtbkpt)
if (bkptr->flag) {
printbkpt(" ? ", adrtoprocp(bkptr->loc), bkptr->loc);
yesflg = 0;
cnt++;
do {
c = getchar();
if (c == 'y' || c == 'd') yesflg++;
} while (c != '\n');
if (yesflg)
bkptr->flag = 0;
}
if (cnt == 0)
printf("No breakpoints set\n");
}
/* delete all breakpoints */
dabkpt() {
register BKPTR bkptr;
for (bkptr = bkpthead; bkptr; bkptr=bkptr->nxtbkpt)
bkptr->flag = 0;
}
/*
* Print name of breakpoint for a, b, d commands:
*/
printbkpt(s, procp, dot)
char *s; struct proct *procp; ADDR dot; {
adrtolineno(dot);
if (dot != lnfaddr)
printf("0x%x (", dot);
prlnoff(procp, dot);
if (dot != lnfaddr)
printf(")");
printf("%s", s);
}
/* print call frame */
prframe() {
prfrx(0);
}
/* set top to print just the top procedure */
prfrx(top) {
int narg;
long offset;
u_char class;
register int endflg;
char *p;
struct proct *procp;
struct nlist stentry;
if ((procp = initframe()) == badproc) return;
do {
if (get(frame+12, DSP) == 0) return;
p = procp->pname;
if (eqstr("__dbsubc", p)) return;
if (p[0] == '_') {
endflg = 1;
#ifndef FLEXNAMES
printf("%.15s(", p+1);
#else
printf("%s(", p+1);
#endif
}
else {
#ifndef FLEXNAMES
printf("%.16s(", p);
#else
printf("%s(", p);
#endif
endflg = 0;
}
if (endflg == 0) {
offset = procp->st_offset;
blseek(&sbuf, offset, 0);
do {
if (bread(&sbuf, &stentry, sizeof stentry) <
sizeof stentry) {
endflg++;
break;
}
class = stentry.n_type & STABMASK;
} while (class == N_FUN);
while (class != N_PSYM) {
if (bread(&sbuf, &stentry, sizeof stentry) <
sizeof stentry) {
endflg++;
break;
}
class = stentry.n_type & STABMASK;
if (class == N_FUN) {
endflg++;
break;
}
}
}
narg = get(argp, DSP);
if (narg & ~0xff) narg = 0;
argp += WORDSIZE;
while (narg) {
if (endflg) {
printf("%d", get(argp, DSP));
argp += 4;
} else {
int length;
#ifndef FLEXNAMES
printf("%.16s=", stentry.n_name);
#else
printf("%s=", stentry.n_un.n_name);
#endif
dispx(argp, "", N_GSYM, stentry.n_desc,
0, 0, DSP);
length = typetosize(stentry.n_desc, 0);
if (length > WORDSIZE)
argp += length;
else
argp += WORDSIZE;
}
do {
if (endflg) break;
if (bread(&sbuf, &stentry, sizeof stentry) <
sizeof stentry) {
endflg++;
break;
}
class = stentry.n_type & STABMASK;
if (class == N_FUN) {
endflg++;
break;
}
} while (class != N_PSYM);
l1: if (--narg != 0) printf(",");
}
printf(")");
if (debug) printf(" @ 0x%x ", callpc);
if (procp->sfptr != badfile)
printf(" [%s:%d]", adrtofilep(callpc-1)->sfilename,
adrtolineno(callpc-1));
printf("\n");
} while (((procp = nextframe()) != badproc) && !top);
}
INT signo;
STRING signals[];
extern nsig;
sigprint()
{
if (signo < nsig)
printf("%s", signals[signo]);
else
printf("signal %d???", signals[signo]);
}