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/*
*
* debugger
*
*/
#include "defs.h"
#include "fns.h"
char BADEQ[] = "unexpected `='";
BOOL executing;
extern char *lp;
char eqformat[ARB] = "z";
char stformat[ARB] = "zMi";
ADDR ditto;
ADDR dot;
WORD dotinc;
WORD adrval, cntval, loopcnt;
int adrflg, cntflg;
/* command decoding */
int
command(char *buf, int defcom)
{
char *reg;
char savc;
char *savlp=lp;
char savlc = lastc;
char savpc = peekc;
static char lastcom = '=', savecom = '=';
if (defcom == 0)
defcom = lastcom;
if (buf) {
if (*buf==EOR)
return(FALSE);
clrinp();
lp=buf;
}
do {
adrflg=expr(0); /* first address */
if (adrflg){
dot=expv;
ditto=expv;
}
adrval=dot;
if (rdc()==',' && expr(0)) { /* count */
cntflg=TRUE;
cntval=expv;
} else {
cntflg=FALSE;
cntval=1;
reread();
}
if (!eol(rdc()))
lastcom=lastc; /* command */
else {
if (adrflg==0)
dot=inkdot(dotinc);
reread();
lastcom=defcom;
}
switch(lastcom) {
case '/':
case '=':
case '?':
savecom = lastcom;
acommand(lastcom);
break;
case '>':
lastcom = savecom;
savc=rdc();
if (reg=regname(savc))
rput(correg, reg, dot);
else
error("bad variable");
break;
case '!':
lastcom=savecom;
shell();
break;
case '$':
lastcom=savecom;
printdollar(nextchar());
break;
case ':':
if (!executing) {
executing=TRUE;
subpcs(nextchar());
executing=FALSE;
lastcom=savecom;
}
break;
case 0:
prints(DBNAME);
break;
default:
error("bad command");
}
flushbuf();
} while (rdc()==';');
if (buf == 0)
reread();
else {
clrinp();
lp=savlp;
lastc = savlc;
peekc = savpc;
}
if(adrflg)
return dot;
return 1;
}
/*
* [/?][wml]
*/
void
acommand(int pc)
{
int eqcom;
Map *map;
char *fmt;
char buf[512];
if (pc == '=') {
eqcom = 1;
fmt = eqformat;
map = dotmap;
} else {
eqcom = 0;
fmt = stformat;
if (pc == '/')
map = cormap;
else
map = symmap;
}
if (!map) {
sprint(buf, "no map for %c", pc);
error(buf);
}
switch (rdc())
{
case 'm':
if (eqcom)
error(BADEQ);
cmdmap(map);
break;
case 'L':
case 'l':
if (eqcom)
error(BADEQ);
cmdsrc(lastc, map);
break;
case 'W':
case 'w':
if (eqcom)
error(BADEQ);
cmdwrite(lastc, map);
break;
default:
reread();
getformat(fmt);
scanform(cntval, !eqcom, fmt, map, eqcom);
}
}
void
cmdsrc(int c, Map *map)
{
u32int w;
long locval, locmsk;
ADDR savdot;
ushort sh;
char buf[512];
int ret;
if (c == 'L')
dotinc = 4;
else
dotinc = 2;
savdot=dot;
expr(1);
locval=expv;
if (expr(0))
locmsk=expv;
else
locmsk = ~0;
if (c == 'L')
while ((ret = get4(map, dot, &w)) > 0 && (w&locmsk) != locval)
dot = inkdot(dotinc);
else
while ((ret = get2(map, dot, &sh)) > 0 && (sh&locmsk) != locval)
dot = inkdot(dotinc);
if (ret < 0) {
dot=savdot;
error("%r");
}
symoff(buf, 512, dot, CANY);
dprint(buf);
}
static char badwrite[] = "can't write process memory or text image";
void
cmdwrite(int wcom, Map *map)
{
ADDR savdot;
char *format;
int pass;
if (wcom == 'w')
format = "x";
else
format = "X";
expr(1);
pass = 0;
do {
pass++;
savdot=dot;
exform(1, 1, format, map, 0, pass);
dot=savdot;
if (wcom == 'W') {
if (put4(map, dot, expv) <= 0)
error(badwrite);
} else {
if (put2(map, dot, expv) <= 0)
error(badwrite);
}
savdot=dot;
dprint("=%8t");
exform(1, 0, format, map, 0, pass);
newline();
} while (expr(0));
dot=savdot;
}
/*
* collect a register name; return register offset
* this is not what i'd call a good division of labour
*/
char *
regname(int regnam)
{
static char buf[64];
char *p;
int c;
p = buf;
*p++ = regnam;
while (isalnum(c = readchar())) {
if (p >= buf+sizeof(buf)-1)
error("register name too long");
*p++ = c;
}
*p = 0;
reread();
return (buf);
}
/*
* shell escape
*/
void
shell(void)
{
int rc, unixpid;
char *argp = lp;
while (lastc!=EOR)
rdc();
if ((unixpid=fork())==0) {
*lp=0;
execl("/bin/rc", "rc", "-c", argp, 0);
exits("execl"); /* botch */
} else if (unixpid == -1) {
error("cannot fork");
} else {
mkfault = 0;
while ((rc = waitpid()) != unixpid){
if(rc == -1 && mkfault){
mkfault = 0;
continue;
}
break;
}
prints("!");
reread();
}
}
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