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kernel: make trap() handlers consistent and check for stack overflow in kenter() for all archs

--- a/sys/src/9/arm64/trap.c

+++ b/sys/src/9/arm64/trap.c

@@ -226,7 +226,6 @@

 		}

 		if(scallnr >= nsyscall || systab[scallnr] == nil){

-			pprint("bad sys call number %lud pc %#p", scallnr, ureg->pc);

 			postnote(up, 1, "sys: bad sys call", NDebug);

 			error(Ebadarg);

 		}

--- a/sys/src/9/bcm/trap.c

+++ b/sys/src/9/bcm/trap.c

@@ -136,20 +136,6 @@

 	uintptr va;

 	char buf[ERRMAX];

-	assert(!islo());

-	if(up != nil)

-		rem = ((char*)ureg)-((char*)up - KSTACK);

-	else

-		rem = ((char*)ureg)-((char*)m+sizeof(Mach));

-	if(rem < 256) {

-		iprint("trap: %d stack bytes left, up %#p ureg %#p at pc %#lux\n",

-			rem, up, ureg, ureg->pc);

-		delay(1000);

-		dumpstack();

-		panic("trap: %d stack bytes left, up %#p ureg %#p at pc %#lux",

-			rem, up, ureg, ureg->pc);

-	}

-

 	user = kenter(ureg);

 	/*

 	 * All interrupts/exceptions should be resumed at ureg->pc-4,

--- a/sys/src/9/cycv/trap.c

+++ b/sys/src/9/cycv/trap.c

@@ -237,8 +237,7 @@

 			startns = todget(nil);

 		}

-		if(scallnr >= nsyscall || systab[scallnr] == 0){

-			pprint("bad sys call number %lud pc %lux", scallnr, ureg->pc);

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

 			postnote(up, 1, "sys: bad sys call", NDebug);

 			error(Ebadarg);

 		}

@@ -272,14 +271,14 @@

 	if(scallnr == NOTED)

 		noted(ureg, *((ulong *) up->s.args));

-	if(scallnr != RFORK && (up->procctl || up->nnote)){

-		splhi();

+	splhi();

+	if(scallnr != RFORK && (up->procctl || up->nnote))

 		notify(ureg);

-	}

-	if(up->delaysched)

+	if(up->delaysched){

 		sched();

+		splhi();

+	}

 	kexit(ureg);

-	splhi();

 }

 int

--- a/sys/src/9/kw/syscall.c

+++ b/sys/src/9/kw/syscall.c

@@ -188,16 +188,11 @@

 			splx(s);

 			startns = todget(nil);

 		}

-		if(scallnr >= nsyscall){

-			pprint("bad sys call number %d pc %#lux\n",

-				scallnr, ureg->pc);

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

 			postnote(up, 1, "sys: bad sys call", NDebug);

 			error(Ebadarg);

 		}

 		up->psstate = sysctab[scallnr];

-

-	/*	iprint("%s: syscall %s\n", up->text, sysctab[scallnr]?sysctab[scallnr]:"huh?"); */

-

 		ret = systab[scallnr]((va_list)up->s.args);

 		poperror();

 	}else{

--- a/sys/src/9/kw/trap.c

+++ b/sys/src/9/kw/trap.c

@@ -193,6 +193,7 @@

 	Handler *h;

 	Irq irq;

+	m->perf.intrts = perfticks();

 	clockintr = 0;

 	assert(sort >= 0 && sort < nelem(irqs));

@@ -369,16 +370,6 @@

 	u32int fsr;

 	uintptr va;

 	char buf[ERRMAX];

-

-	if(up != nil)

-		rem = (char*)ureg - ((char*)up - KSTACK);

-	else

-		rem = (char*)ureg - ((char*)m + sizeof(Mach));

-	if(rem < 256) {

-		dumpstack();

-		panic("trap %d bytes remaining, up %#p ureg %#p at pc %#lux",

-			rem, up, ureg, ureg->pc);

-	}

 	user = kenter(ureg);

 	if(ureg->type == PsrMabt+1)

--- a/sys/src/9/mt7688/syscall.c

+++ b/sys/src/9/mt7688/syscall.c

@@ -42,17 +42,12 @@

 	ret = -1;

 	if(!waserror()){

+		if(sp < (USTKTOP-BY2PG) || sp > (USTKTOP-sizeof(Sargs)))

+			validaddr(sp, sizeof(Sargs), 0);

-		if(scallnr >= nsyscall){

-			iprint("bad sys call number %lud pc %#lux\n",

-				scallnr, ureg->pc);

-			postnote(up, 1, "sys: bad sys call", NDebug);

-			error(Ebadarg);

-		}

+		up->s = *((Sargs*)(sp));	/* spim's libc is different to mips ... */

 		if(up->procctl == Proc_tracesyscall){

-			iprint("tracesyscall\n");

-			delay(50);

 			syscallfmt(scallnr, ureg->pc, (va_list)up->s.args);

 			s = splhi();

 			up->procctl = Proc_stopme;

@@ -61,16 +56,11 @@

 			startns = todget(nil);

 		}

-		if(sp < (USTKTOP-BY2PG) || sp > (USTKTOP-sizeof(Sargs)))

-			validaddr(sp, sizeof(Sargs), 0);

-

-		up->s = *((Sargs*)(sp));	/* spim's libc is different to mips ... */

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

+			postnote(up, 1, "sys: bad sys call", NDebug);

+			error(Ebadarg);

+		}

 		up->psstate = sysctab[scallnr];

-

-//		iprint("[%luX] %s: syscall %s\n", (ulong)&ureg, up->text, sysctab[scallnr]?sysctab[scallnr]:"huh?");

-//		delay(20);

-//		dumpregs(ureg);

-

 		ret = systab[scallnr]((va_list)up->s.args);

 		poperror();

 	}else{

@@ -120,6 +110,7 @@

 	/* if we delayed sched because we held a lock, sched now */

 	if(up->delaysched){

 		sched();

+		splhi();

 	}

 	kexit(ureg);

--- a/sys/src/9/mt7688/trap.c

+++ b/sys/src/9/mt7688/trap.c

@@ -152,19 +152,6 @@

 	char buf[2*ERRMAX], buf1[ERRMAX], *fpexcep;

 	static int dumps;

-	if (up && (char *)(ur) - ((char *)up - KSTACK) < 1024 && dumps++ == 0) {

-		iprint("trap: proc %ld kernel stack getting full\n", up->pid);

-		dumpregs(ur);

-		dumpstack();

-		for(;;);

-	}

-	if (up == nil &&

-	    (char *)(ur) - (char *)m->stack < 1024 && dumps++ == 0) {

-		iprint("trap: cpu%d kernel stack getting full\n", m->machno);

-		dumpregs(ur);

-		dumpstack();

-		for(;;);

-	}

 	user = kenter(ur);

 	if (ur->cause & TS)

 		panic("trap: tlb shutdown");

--- a/sys/src/9/mtx/trap.c

+++ b/sys/src/9/mtx/trap.c

@@ -613,18 +613,16 @@

 	up->nerrlab = 0;

 	ret = -1;

 	if(!waserror()){

-		if(scallnr >= nsyscall || systab[scallnr] == nil){

-			pprint("bad sys call number %d pc %lux\n", scallnr, ureg->pc);

-			postnote(up, 1, "sys: bad sys call", NDebug);

-			error(Ebadarg);

-		}

-

 		if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-sizeof(Sargs)-BY2WD))

 			validaddr(sp, sizeof(Sargs)+BY2WD, 0);

 		up->s = *((Sargs*)(sp+BY2WD));

-		up->psstate = sysctab[scallnr];

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

+			postnote(up, 1, "sys: bad sys call", NDebug);

+			error(Ebadarg);

+		}

+		up->psstate = sysctab[scallnr];

 		ret = systab[scallnr](up->s.args);

 		poperror();

 	}else{

--- a/sys/src/9/omap/syscall.c

+++ b/sys/src/9/omap/syscall.c

@@ -181,21 +181,15 @@

 	up->nerrlab = 0;

 	ret = -1;

 	if(!waserror()){

-		if(scallnr >= nsyscall){

-			pprint("bad sys call number %d pc %#lux\n",

-				scallnr, ureg->pc);

-			postnote(up, 1, "sys: bad sys call", NDebug);

-			error(Ebadarg);

-		}

-

 		if(sp < (USTKTOP-BY2PG) || sp > (USTKTOP-sizeof(Sargs)-BY2WD))

 			validaddr(sp, sizeof(Sargs)+BY2WD, 0);

 		up->s = *((Sargs*)(sp+BY2WD));

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

+			postnote(up, 1, "sys: bad sys call", NDebug);

+			error(Ebadarg);

+		}

 		up->psstate = sysctab[scallnr];

-

-	/*	iprint("%s: syscall %s\n", up->text, sysctab[scallnr]?sysctab[scallnr]:"huh?"); */

-

 		ret = systab[scallnr]((va_list)up->s.args);

 		poperror();

 	}else{

--- a/sys/src/9/omap/trap.c

+++ b/sys/src/9/omap/trap.c

@@ -451,20 +451,6 @@

 	uintptr va;

 	char buf[ERRMAX];

-	splhi();			/* paranoia */

-	if(up != nil)

-		rem = ((char*)ureg)-((char*)up-KSTACK);

-	else

-		rem = ((char*)ureg)-((char*)m+sizeof(Mach));

-	if(rem < 1024) {

-		iprint("trap: %d stack bytes left, up %#p ureg %#p at pc %#lux\n",

-			rem, up, ureg, ureg->pc);

-		delay(1000);

-		dumpstack();

-		panic("trap: %d stack bytes left, up %#p ureg %#p at pc %#lux",

-			rem, up, ureg, ureg->pc);

-	}

-

 	user = kenter(ureg);

 	/*

 	 * All interrupts/exceptions should be resumed at ureg->pc-4,

--- a/sys/src/9/pc/trap.c

+++ b/sys/src/9/pc/trap.c

@@ -382,14 +382,11 @@

 static void

 debugbpt(Ureg* ureg, void*)

 {

-	char buf[ERRMAX];

-

 	if(up == 0)

 		panic("kernel bpt");

 	/* restore pc to instruction that caused the trap */

 	ureg->pc--;

-	sprint(buf, "sys: breakpoint");

-	postnote(up, 1, buf, NDebug);

+	postnote(up, 1, "sys: breakpoint", NDebug);

 }

 static void

@@ -500,9 +497,7 @@

 			startns = todget(nil);

 		}

-		if(scallnr >= nsyscall || systab[scallnr] == 0){

-			pprint("bad sys call number %lud pc %lux\n",

-				scallnr, ureg->pc);

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

 			postnote(up, 1, "sys: bad sys call", NDebug);

 			error(Ebadarg);

 		}

@@ -548,13 +543,14 @@

 	if(scallnr == NOTED)

 		noted(ureg, *((ulong*)up->s.args));

-	if(scallnr!=RFORK && (up->procctl || up->nnote)){

-		splhi();

+	splhi();

+	if(scallnr!=RFORK && (up->procctl || up->nnote))

 		notify(ureg);

-	}

 	/* if we delayed sched because we held a lock, sched now */

-	if(up->delaysched)

+	if(up->delaysched){

 		sched();

+		splhi();

+	}

 	kexit(ureg);

 }

--- a/sys/src/9/port/proc.c

+++ b/sys/src/9/port/proc.c

@@ -111,6 +111,19 @@

 	if(user){

 		up->dbgreg = ureg;

 		cycles(&up->kentry);

+	} else {

+		int rem;

+

+		if((uchar*)&ureg < (uchar*)ureg){

+			/* stack grows down */

+			rem = (int)((uintptr)ureg - (up!=nil? (uintptr)up - KSTACK: (uintptr)m->stack));

+		} else {

+			/* stack grows up */

+			rem = (int)((up!=nil? (uintptr)up: (uintptr)m + MACHSIZE) - (uintptr)ureg);

+		}

+		if(rem < 256)

+			panic("kenter: %d stack bytes left, up %#p ureg %#p at pc %#p",

+				rem, up, ureg, ureg->pc);

 	}

 	return user;

 }

--- a/sys/src/9/ppc/trap.c

+++ b/sys/src/9/ppc/trap.c

@@ -282,9 +282,6 @@

 	splhi();

 	if(user) {

-		if (up->fpstate == FPactive && (ureg->srr1 & MSR_FP) == 0){

-			postnote(up, 1, buf, NDebug);

-		}

 		notify(ureg);

 		if(up->fpstate != FPactive)

 			ureg->srr1 &= ~MSR_FP;

@@ -600,18 +597,15 @@

 	up->nerrlab = 0;

 	ret = -1;

 	if(!waserror()){

-		if(scallnr >= nsyscall || systab[scallnr] == nil){

-			pprint("bad sys call number %d pc %lux\n", scallnr, ureg->pc);

-			postnote(up, 1, "sys: bad sys call", NDebug);

-			error(Ebadarg);

-		}

-

 		if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-sizeof(Sargs)-BY2WD))

 			validaddr(sp, sizeof(Sargs)+BY2WD, 0);

 		up->s = *((Sargs*)(sp+BY2WD));

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

+			postnote(up, 1, "sys: bad sys call", NDebug);

+			error(Ebadarg);

+		}

 		up->psstate = sysctab[scallnr];

-

 		ret = systab[scallnr]((va_list)up->s.args);

 		poperror();

 	}else{

--- a/sys/src/9/sgi/trap.c

+++ b/sys/src/9/sgi/trap.c

@@ -158,21 +158,7 @@

 	int ecode, user, cop, x, fpchk;

 	ulong fpfcr31;

 	char buf[2*ERRMAX], buf1[ERRMAX], *fpexcep;

-	static int dumps;

-	if (up && (char *)(ur) - ((char *)up - KSTACK) < 1024 && dumps++ == 0) {

-		iprint("trap: proc %ld kernel stack getting full\n", up->pid);

-		dumpregs(ur);

-		dumpstack();

-		for(;;);

-	}

-	if (up == nil &&

-	    (char *)(ur) - (char *)m->stack < 1024 && dumps++ == 0) {

-		iprint("trap: cpu%d kernel stack getting full\n", m->machno);

-		dumpregs(ur);

-		dumpstack();

-		for(;;);

-	}

 	user = kenter(ur);

 	if (ur->cause & TS)

 		panic("trap: tlb shutdown");

@@ -662,16 +648,7 @@

 	up->nerrlab = 0;

 	ret = -1;

 	if(!waserror()) {

-		if(scallnr >= nsyscall || systab[scallnr] == 0){

-			pprint("bad sys call number %ld pc %#lux\n",

-				scallnr, ur->pc);

-			postnote(up, 1, "sys: bad sys call", NDebug);

-			error(Ebadarg);

-		}

-

 		if(sp & (BY2WD-1)){

-			pprint("odd sp in sys call pc %#lux sp %#lux\n",

-				ur->pc, ur->sp);

 			postnote(up, 1, "sys: odd stack", NDebug);

 			error(Ebadarg);

 		}

@@ -680,6 +657,10 @@

 			validaddr(sp, sizeof(Sargs)+BY2WD, 0);

 		up->s = *((Sargs*)(sp+BY2WD));

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

+			postnote(up, 1, "sys: bad sys call", NDebug);

+			error(Ebadarg);

+		}

 		up->psstate = sysctab[scallnr];

 		ret = systab[scallnr]((va_list)up->s.args);

@@ -714,8 +695,10 @@

 	if(scallnr!=RFORK && (up->procctl || up->nnote))

 		notify(ur);

 	/* if we delayed sched because we held a lock, sched now */

-	if(up->delaysched)

+	if(up->delaysched){

 		sched();

+		splhi();

+	}

 	/* replicate fpstate to ureg status */

 	if(up->fpstate != FPactive)

 		ur->status &= ~CU1;

--- a/sys/src/9/teg2/syscall.c

+++ b/sys/src/9/teg2/syscall.c

@@ -206,21 +206,15 @@

 	l1cache->wb();			/* system is more stable with this */

 	if(!waserror()){

-		if(scallnr >= nsyscall){

-			pprint("bad sys call number %d pc %#lux\n",

-				scallnr, ureg->pc);

-			postnote(up, 1, "sys: bad sys call", NDebug);

-			error(Ebadarg);

-		}

-

 		if(sp < (USTKTOP-BY2PG) || sp > (USTKTOP-sizeof(Sargs)-BY2WD))

 			validaddr(sp, sizeof(Sargs)+BY2WD, 0);

 		up->s = *((Sargs*)(sp+BY2WD));

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

+			postnote(up, 1, "sys: bad sys call", NDebug);

+			error(Ebadarg);

+		}

 		up->psstate = sysctab[scallnr];

-

-	/*	iprint("%s: syscall %s\n", up->text, sysctab[scallnr]?sysctab[scallnr]:"huh?"); */

-

 		ret = systab[scallnr]((va_list)up->s.args);

 		poperror();

 	}else{

--- a/sys/src/9/teg2/trap.c

+++ b/sys/src/9/teg2/trap.c

@@ -633,12 +633,12 @@

 irq(Ureg* ureg)

 {

 	int clockintr, ack;

-	uint irqno, handled, t, ticks;

+	uint irqno, handled;

 	Intrcpuregs *icp = (Intrcpuregs *)soc.intr;

 	Vctl *v;

 	m->intr++;

-	ticks = perfticks();

+	m->perf.intrts = perfticks();

 	handled = 0;

 	ack = intack(icp);

 	irqno = ack & Intrmask;

@@ -677,17 +677,6 @@

 			iprint("cpu%d: unexpected interrupt %d, now masked\n",

 				m->machno, irqno);

 		}

-	t = perfticks();

-	if (0) {			/* left over from another port? */

-		ilock(&nintrlock);

-		ninterrupt++;

-		if(t < ticks)

-			ninterruptticks += ticks-t;

-		else

-			ninterruptticks += t-ticks;

-		iunlock(&nintrlock);

-	}

-	USED(t, ticks);

 	clockintr = m->inclockintr == 1;

 	if (irqno == Loctmrirq)

 		m->inclockintr--;

@@ -818,20 +807,6 @@

 	int user, rem;

 	uintptr va, ifar, ifsr;

-	splhi();			/* paranoia */

-	if(up != nil)

-		rem = ((char*)ureg)-((char*)up-KSTACK);

-	else

-		rem = ((char*)ureg)-((char*)m+sizeof(Mach));

-	if(rem < 1024) {

-		iprint("trap: %d stack bytes left, up %#p ureg %#p m %#p cpu%d at pc %#lux\n",

-			rem, up, ureg, m, m->machno, ureg->pc);

-		dumpstackwithureg(ureg);

-		panic("trap: %d stack bytes left, up %#p ureg %#p at pc %#lux",

-			rem, up, ureg, ureg->pc);

-	}

-

-	m->perf.intrts = perfticks();

 	user = kenter(ureg);

 	/*

 	 * All interrupts/exceptions should be resumed at ureg->pc-4,

--- a/sys/src/9/xen/trap.c

+++ b/sys/src/9/xen/trap.c

@@ -303,15 +303,11 @@

 static void

 debugbpt(Ureg* ureg, void*)

 {

-	char buf[ERRMAX];

-	print("debugbpt\n");

 	if(up == 0)

 		panic("kernel bpt");

 	/* restore pc to instruction that caused the trap */

 	ureg->pc--;

-	sprint(buf, "sys: breakpoint");

-	postnote(up, 1, buf, NDebug);

-	print("debugbpt for proc %lud\n", up->pid);

+	postnote(up, 1, "sys: breakpoint", NDebug);

 }

 static void

@@ -409,19 +405,16 @@

 	up->nerrlab = 0;

 	ret = -1;

 	if(!waserror()){

-		if(scallnr >= nsyscall || systab[scallnr] == 0){

-			pprint("bad sys call number %lud pc %lux\n",

-				scallnr, ureg->pc);

-			postnote(up, 1, "sys: bad sys call", NDebug);

-			error(Ebadarg);

-		}

-

 		if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-sizeof(Sargs)-BY2WD))

 			validaddr(sp, sizeof(Sargs)+BY2WD, 0);

 		up->s = *((Sargs*)(sp+BY2WD));

-		up->psstate = sysctab[scallnr];

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

+			postnote(up, 1, "sys: bad sys call", NDebug);

+			error(Ebadarg);

+		}

+		up->psstate = sysctab[scallnr];

 		ret = systab[scallnr]((va_list)up->s.args);

 		poperror();

 	}else{

@@ -462,13 +455,14 @@

 	if(scallnr == NOTED)

 		noted(ureg, *(ulong*)(sp+BY2WD));

-	if(scallnr!=RFORK && (up->procctl || up->nnote)){

-		splhi();

+	splhi();

+	if(scallnr!=RFORK && (up->procctl || up->nnote))

 		notify(ureg);

-	}

 	/* if we delayed sched because we held a lock, sched now */

-	if(up->delaysched)

+	if(up->delaysched){

 		sched();

+		splhi();

+	}

 	INTRLOG(dprint("before kexit\n");)

 	kexit(ureg);

 }

--- a/sys/src/9/zynq/trap.c

+++ b/sys/src/9/zynq/trap.c

@@ -236,9 +236,7 @@

 			splx(s);

 			startns = todget(nil);

 		}

-		

-		if(scallnr >= nsyscall || systab[scallnr] == 0){

-			pprint("bad sys call number %lud pc %lux", scallnr, ureg->pc);

+		if(scallnr >= nsyscall || systab[scallnr] == nil){

 			postnote(up, 1, "sys: bad sys call", NDebug);

 			error(Ebadarg);

 		}

@@ -272,14 +270,14 @@

 	if(scallnr == NOTED)

 		noted(ureg, *((ulong *) up->s.args));

-	if(scallnr != RFORK && (up->procctl || up->nnote)){

-		splhi();

+	splhi();

+	if(scallnr != RFORK && (up->procctl || up->nnote))

 		notify(ureg);

-	}

-	if(up->delaysched)

+	if(up->delaysched){

 		sched();

+		splhi();

+	}

 	kexit(ureg);

-	splhi();

 }

 int