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/*
* db - main command loop and error/interrupt handling
*/
#include "defs.h"
#include "fns.h"
int wtflag = OREAD;
BOOL kflag;
BOOL mkfault;
ADDR maxoff;
int xargc; /* bullshit */
extern BOOL executing;
extern int infile;
int exitflg;
extern int eof;
int alldigs(char*);
void fault(void*, char*);
extern char *Ipath;
jmp_buf env;
static char *errmsg;
Fhdr *symhdr, *corhdr;
void
usage(void)
{
fprint(2, "usage: db [-kw] [-m machine] [-I dir] [symfile] [pid]\n");
exits("usage");
}
void
main(int argc, char **argv)
{
int i, omode;
char *s;
char *name;
Fhdr *hdr;
name = 0;
outputinit();
maxoff = MAXOFF;
omode = OREAD;
ARGBEGIN{
default:
usage();
case 'A':
abort();
case 'k':
kflag = 1;
break;
case 'w':
omode = ORDWR;
break;
case 'I':
s = ARGF();
if(s == 0)
dprint("missing -I argument\n");
else
Ipath = s;
break;
case 'm':
name = ARGF();
if(name == 0)
dprint("missing -m argument\n");
break;
}ARGEND
/*
* Unix and Plan 9 differ on what the right order of pid, text, and core is.
* I never remember anyway. Let's just accept them in any order.
*/
for(i=0; i<argc; i++){
if(alldigs(argv[i])){
if(pid){
dprint("already have pid %d; ignoring pid %d\n", pid, argv[i]);
continue;
}
if(corhdr){
dprint("already have core %s; ignoring pid %d\n", corfil, pid);
continue;
}
pid = atoi(argv[i]);
continue;
}
if((hdr = crackhdr(argv[i], omode)) == nil){
dprint("crackhdr %s: %r\n", argv[i]);
continue;
}
dprint("%s: %s %s %s\n", argv[i], hdr->aname, hdr->mname, hdr->fname);
if(hdr->ftype == FCORE){
if(pid){
dprint("already have pid %d; ignoring core %s\n", pid, argv[i]);
uncrackhdr(hdr);
continue;
}
if(corhdr){
dprint("already have core %s; ignoring core %s\n", corfil, argv[i]);
uncrackhdr(hdr);
continue;
}
corhdr = hdr;
corfil = argv[i];
}else{
if(symhdr){
dprint("already have text %s; ignoring text %s\n", symfil, argv[i]);
uncrackhdr(hdr);
continue;
}
symhdr = hdr;
symfil = argv[i];
}
}
if(symhdr==nil){
symfil = "a.out";
if(pid){
if((s = proctextfile(pid)) != nil){
dprint("pid %d: text %s\n", pid, s);
symfil = s;
}
}
/* XXX pull command from core */
if((symhdr = crackhdr(symfil, omode)) == nil){
dprint("crackhdr %s: %r\n", symfil);
symfil = nil;
}
}
if(!mach)
mach = machcpu;
/*
* Set up maps.
*/
symmap = allocmap();
cormap = allocmap();
if(symmap == nil || cormap == nil)
sysfatal("allocating maps: %r");
if(symhdr){
if(mapfile(symhdr, 0, symmap, nil) < 0)
dprint("mapping %s: %r\n", symfil);
mapfile(symhdr, 0, cormap, nil);
}
dotmap = dumbmap(-1);
/*
* show initial state and drop into the execution loop.
*/
notify(fault);
setsym();
if(setjmp(env) == 0){
if (pid || corhdr)
setcor(); /* could get error */
if (correg) {
dprint("%s\n", mach->exc(cormap, correg));
printpc();
}
}
setjmp(env);
if (executing)
delbp();
executing = FALSE;
for (;;) {
flushbuf();
if (errmsg) {
dprint(errmsg);
printc('\n');
errmsg = 0;
exitflg = 0;
}
if (mkfault) {
mkfault=0;
printc('\n');
prints(DBNAME);
}
clrinp();
rdc();
reread();
if (eof) {
if (infile == STDIN)
done();
iclose(-1, 0);
eof = 0;
longjmp(env, 1);
}
exitflg = 0;
command(0, 0);
reread();
if (rdc() != '\n')
error("newline expected");
}
}
int
alldigs(char *s)
{
while(*s){
if(*s<'0' || '9'<*s)
return 0;
s++;
}
return 1;
}
void
done(void)
{
if (pid)
endpcs();
exits(exitflg? "error": 0);
}
/*
* An error occurred; save the message for later printing,
* close open files, and reset to main command loop.
*/
void
error(char *n)
{
errmsg = n;
iclose(0, 1);
oclose();
flush();
delbp();
ending = 0;
longjmp(env, 1);
}
void
errors(char *m, char *n)
{
static char buf[128];
sprint(buf, "%s: %s", m, n);
error(buf);
}
/*
* An interrupt occurred;
* seek to the end of the current file
* and remember that there was a fault.
*/
void
fault(void *a, char *s)
{
USED(a);
if(strncmp(s, "interrupt", 9) == 0){
seek(infile, 0L, 2);
mkfault++;
noted(NCONT);
}
noted(NDFLT);
}
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