C++ (Cpp) fpunotify Examples

Example #1

File: syscall.c Project: 99years/plan9

/*
 *  Call user, if necessary, with note.
 *  Pass user the Ureg struct and the note on his stack.
 */
int
notify(Ureg* ureg)
{
	int l;
	Mpl pl;
	Note note;
	uintptr sp;
	NFrame *nf;

	/*
	 * Calls procctl splhi, see comment in procctl for the reasoning.
	 */
	if(up->procctl)
		procctl(up);
	if(up->nnote == 0)
		return 0;

	fpunotify(ureg);

	pl = spllo();
	qlock(&up->debug);

	up->notepending = 0;
	memmove(&note, &up->note[0], sizeof(Note));
	if(strncmp(note.msg, "sys:", 4) == 0){
		l = strlen(note.msg);
		if(l > ERRMAX-sizeof(" pc=0x0123456789abcdef"))
			l = ERRMAX-sizeof(" pc=0x0123456789abcdef");
		sprint(note.msg+l, " pc=%#p", ureg->ip);
	}

	if(note.flag != NUser && (up->notified || up->notify == nil)){
		qunlock(&up->debug);
		if(note.flag == NDebug)
			pprint("suicide: %s\n", note.msg);
		pexit(note.msg, note.flag != NDebug);
	}

	if(up->notified){
		qunlock(&up->debug);
		splhi();
		return 0;
	}

	if(up->notify == nil){
		qunlock(&up->debug);
		pexit(note.msg, note.flag != NDebug);
	}
	if(!okaddr(PTR2UINT(up->notify), sizeof(ureg->ip), 0)){
		qunlock(&up->debug);
		pprint("suicide: bad function address %#p in notify\n",
			up->notify);
		pexit("Suicide", 0);
	}

	sp = ureg->sp - sizeof(NFrame);
	if(!okaddr(sp, sizeof(NFrame), 1)){
		qunlock(&up->debug);
		pprint("suicide: bad stack address %#p in notify\n", sp);
		pexit("Suicide", 0);
	}

	nf = UINT2PTR(sp);
	memmove(&nf->ureg, ureg, sizeof(Ureg));
	nf->old = up->ureg;
	up->ureg = nf;	/* actually the NFrame, for noted */
	memmove(nf->msg, note.msg, ERRMAX);
	nf->arg1 = nf->msg;
	nf->arg0 = &nf->ureg;
	ureg->bp = PTR2UINT(nf->arg0);
	nf->ip = 0;

	ureg->sp = sp;
	ureg->ip = PTR2UINT(up->notify);
	up->notified = 1;
	up->nnote--;
	memmove(&up->lastnote, &note, sizeof(Note));
	memmove(&up->note[0], &up->note[1], up->nnote*sizeof(Note));

	qunlock(&up->debug);
	splx(pl);

	return 1;
}

Example #2

File: syscall.c Project: carriercomm/plan9-gpl

/*
 *  Call user, if necessary, with note.
 *  Pass user the Ureg struct and the note on his stack.
 */
int
notify(Ureg* ureg)
{
	int l;
	Note *n;
	u32int s;
	uintptr sp;
	NFrame *nf;

	if(up->procctl)
		procctl(up);
	if(up->nnote == 0)
		return 0;

	fpunotify(ureg);

	s = spllo();
	qlock(&up->debug);

	up->notepending = 0;
	n = &up->note[0];
	if(strncmp(n->msg, "sys:", 4) == 0){
		l = strlen(n->msg);
		if(l > ERRMAX-23)	/* " pc=0x0123456789abcdef\0" */
			l = ERRMAX-23;
		snprint(n->msg + l, sizeof n->msg - l, " pc=%#lux", ureg->pc);
	}

	if(n->flag != NUser && (up->notified || up->notify == 0)){
		if(n->flag == NDebug)
			pprint("suicide: %s\n", n->msg);
		qunlock(&up->debug);
		pexit(n->msg, n->flag != NDebug);
	}

	if(up->notified){
		qunlock(&up->debug);
		splhi();
		return 0;
	}
		
	if(up->notify == nil){
		qunlock(&up->debug);
		pexit(n->msg, n->flag != NDebug);
	}
	if(!okaddr(PTR2UINT(up->notify), 1, 0)){
		pprint("suicide: notify function address %#p\n", up->notify);
		qunlock(&up->debug);
		pexit("Suicide", 0);
	}

	sp = ureg->sp - sizeof(NFrame);
	if(!okaddr(sp, sizeof(NFrame), 1)){
		qunlock(&up->debug);
		pprint("suicide: notify stack address %#p\n", sp);
		pexit("Suicide", 0);
	}

	nf = UINT2PTR(sp);
	memmove(&nf->ureg, ureg, sizeof(Ureg));
	nf->old = up->ureg;
	up->ureg = nf;
	memmove(nf->msg, up->note[0].msg, ERRMAX);
	nf->arg1 = nf->msg;
	nf->arg0 = &nf->ureg;
	ureg->r0 = PTR2UINT(nf->arg0);
	nf->ip = 0;

	ureg->sp = sp;
	ureg->pc = PTR2UINT(up->notify);
	up->notified = 1;
	up->nnote--;
	memmove(&up->lastnote, &up->note[0], sizeof(Note));
	memmove(&up->note[0], &up->note[1], up->nnote*sizeof(Note));

	qunlock(&up->debug);
	splx(s);

	return 1;
}