1993/0212/power/trap.c (diff list | history)

1993/0212/sys/src/9/power/trap.c:1,615 – 1993/0225/sys/src/9/power/trap.c:1,616 (short | long | prev | next)
1990/0227		#include "u.h"
1992/0321		#include "../port/lib.h"
1990/0227		#include "mem.h" #include "dat.h" #include "fns.h" #include "ureg.h" #include "io.h"
1992/0111		#include "../port/error.h"
1990/0227		void (*vmevec[256])(int);
1991/0717		void noted(Ureg**, ulong);
1990/0227		void rfnote(Ureg**); char *excname[] = {
1992/0102		"trap: external interrupt", "trap: TLB modification", "trap: TLB miss (load or fetch)", "trap: TLB miss (store)", "trap: address error (load or fetch)", "trap: address error (store)", "trap: bus error (fetch)", "trap: bus error (data load or store)", "trap: system call",
1990/0227		"breakpoint",
1992/0102		"trap: reserved instruction", "trap: coprocessor unusable", "trap: arithmetic overflow", "trap: undefined 13", "trap: undefined 14",
1992/0803		"trap: undefined 15", /* used as sys call for debugger */
1990/0227		};
1992/1129		char *fpcause[] = { "inexact operation", "underflow", "overflow", "division by zero", "invalid operation", };
1992/0806		char *fpexcname(Ureg*, ulong, char*);
1992/1129		#define FPEXPMASK (0x3f<<12) /* Floating exception bits in fcr31 */
1990/0227		char *regname[]={ "STATUS", "PC", "SP", "CAUSE", "BADADDR", "TLBVIRT", "HI", "LO", "R31", "R30", "R28", "R27", "R26", "R25", "R24", "R23", "R22", "R21", "R20", "R19", "R18", "R17", "R16", "R15", "R14", "R13", "R12", "R11", "R10", "R9", "R8", "R7", "R6", "R5", "R4", "R3", "R2", "R1", }; void trap(Ureg *ur) { int ecode;
1992/0802		ulong fcr31;
1992/1129		int user, cop, x, fpchk;
1992/1128		char buf[2*ERRLEN], buf1[ERRLEN], *fpexcep;
1992/1129
1992/1202		m->ur = ur;
1992/1129		ecode = (ur->cause>>2)&0xf;
1990/0227		user = ur->status&KUP;
1992/1129		fpchk = 0;
1993/0106		if(user) { u->dbgreg = ur; if(u->p->fpstate == FPactive) { if((ur->status&CU1) == 0) /* Paranoid */ panic("FPactive but no CU1"); u->p->fpstate = FPinactive; ur->status &= ~CU1; savefpregs(&u->fpsave); fptrap(ur); fpchk = 1; }
1992/1128		}
1990/0227		switch(ecode){ case CINT:
1992/1128		if(ur->cause&INTR3) { /* FP trap */
1992/1129		clrfpintr();
1992/1128		ur->cause &= ~INTR3;
1991/0209		} intr(ur);
1990/0227		break; case CTLBM: case CTLBL: case CTLBS: if(u == 0)
1990/0802		panic("fault u==0 pc %lux addr %lux", ur->pc, ur->badvaddr);
1992/1129
1990/0227		x = u->p->insyscall; u->p->insyscall = 1;
1992/1130		spllo();
1990/1212		faultmips(ur, user, ecode);
1990/0227		u->p->insyscall = x; break; case CCPU:
1992/1128		cop = (ur->cause>>28)&3;
1993/0106		if(user && cop == 1) {
1992/1128		if(u->p->fpstate == FPinit) {
1992/1129		u->p->fpstate = FPinactive; fcr31 = u->fpsave.fpstatus; u->fpsave = initfp; u->fpsave.fpstatus = fcr31;
1992/1128		break; }
1992/1129		if(u->p->fpstate == FPinactive)
1992/1128		break;
1990/0227		}
1992/1128		/* Fallthrough */
1990/0227		default:
1992/1128		if(user) {
1990/0227		spllo();
1992/1128		sprint(buf, "sys: %s", excname[ecode]);
1990/0227		postnote(u->p, 1, buf, NDebug);
1992/1128		break;
1990/0227		}
1992/1128		print("kernel %s pc=%lux\n", excname[ecode], ur->pc); dumpregs(ur); dumpstack(); if(m->machno == 0) spllo(); exit(1);
1990/0227		}
1991/0705
1992/1129		if(fpchk) { fcr31 = u->fpsave.fpstatus; if((fcr31>>12) & ((fcr31>>7)|0x20) & 0x3f) { spllo(); fpexcep = fpexcname(ur, fcr31, buf1); sprint(buf, "sys: fp: %s", fpexcep); postnote(u->p, 1, buf, NDebug);
1991/1114		}
1990/0227		}
1992/1129		splhi(); if(!user) return; notify(ur); if(u->p->fpstate == FPinactive) {
1993/0107		restfpregs(&u->fpsave, u->fpsave.fpstatus);
1992/1129		u->p->fpstate = FPactive; ur->status |= CU1; }
1990/0227		} void
1991/0209		intr(Ureg *ur)
1990/0227		{ long v;
1993/0211		int i, any, limit;
1991/0209		ulong cause;
1991/0219		static int bogies;
1992/1217		uchar pend, xxx;
1990/0227
1991/0425		m->intr++;
1991/0209		cause = ur->cause&(INTR5|INTR4|INTR3|INTR2|INTR1);
1992/1128
1990/0227		if(cause & INTR1){ duartintr(); cause &= ~INTR1; }
1992/1128
1993/0211		for(limit = 50; (cause&INTR5) && limit; limit--) {
1991/0212		any = 0;
1990/0227		if(!(*MPBERR1 & (1<<8))){
1990/0911		print("MP bus error %lux %lux\n", *MPBERR0, *MPBERR1);
1992/1128		print("PC %lux R31 %lux\n", ur->pc, ur->r31);
1990/0227		*MPBERR0 = 0; i = *SBEADDR;
1990/1214		USED(i);
1991/0212		any = 1;
1990/0227		} /* * directions from IO2 manual * 1. clear all IO2 masks */
1991/0212		*IO2CLRMASK = 0xff000000;
1990/0227		/* * 2. wait for interrupt in progress */ while(!(*INTPENDREG & (1<<5))) ; /* * 3. read pending interrupts */
1991/0316		pend = SBCCREG->fintpending;
1990/0227		/* * 4. clear pending register */ i = SBCCREG->flevel;
1990/1214		USED(i);
1991/0316		/* * 4a. attempt to fix problem */ if(!(*INTPENDREG & (1<<5))) print("pause again\n"); while(!(*INTPENDREG & (1<<5))) ; xxx = SBCCREG->fintpending; if(xxx){ print("new pend %ux\n", xxx); i = SBCCREG->flevel;
1991/0425		USED(i);
1991/0316		}
1990/0227		/* * 5a. process lance, scsi */ if(pend & 1) { v = INTVECREG->i[0].vec;
1990/0907		if(!(v & (1<<12))){
1992/1128		print("ioberr %lux %lux\n", *MPBERR0, *MPBERR1); print("PC %lux R31 %lux\n", ur->pc, ur->r31);
1990/0907		*MPBERR0 = 0;
1991/0212		any = 1;
1990/0907		}
1990/0911		if(ioid < IO3R1){
1991/0212		if(!(v & 7)) any = 1;
1990/0907		if(!(v & (1<<2))) lanceintr(); if(!(v & (1<<1))) lanceparity(); if(!(v & (1<<0))) print("SCSI interrupt\n");
1991/0212		}else{ if(v & 7) any = 1;
1990/0907		if(v & (1<<2))
1990/0911		lanceintr();
1990/0907		if(v & (1<<1))
1992/1208		scsiintr(1);
1990/0907		if(v & (1<<0))
1992/1208		scsiintr(0);
1990/0907		}
1990/0227		} /* * 5b. process vme
1991/0212		* i can guess your level
1990/0227		*/
1991/0212		for(i=1; pend>>=1; i++){
1990/0227		if(pend & 1) { v = INTVECREG->i[i].vec;
1990/0907		if(!(v & (1<<12))){
1991/0212		print("io2 mp bus error %d %lux %lux\n", i, *MPBERR0, *MPBERR1);
1990/0907		*MPBERR0 = 0; }
1990/0227		v &= 0xff; (*vmevec[v])(v);
1991/0212		any = 1;
1990/0227		} } /* * 6. re-enable interrupts */
1991/0212		*IO2SETMASK = 0xff000000;
1992/1209		if(any == 0) cause &= ~INTR5;
1990/0227		}
1993/0211		if(limit == 0) {
1993/0212		LEDON(LED5);
1993/0211		print("intr: unable to identify and clear level5\n"); cause &= ~INTR5;
1993/0212		LEDOFF(LED5);
1993/0211		}
1992/1128
1992/1129		if(cause & (INTR2|INTR4)) {
1992/1128		clock(ur); cause &= ~(INTR2|INTR4); }
1990/0227		if(cause) panic("cause %lux %lux\n", u, cause); }
1992/0803		char*
1992/0806		fpexcname(Ureg *ur, ulong fcr31, char *buf)
1990/0227		{ int i;
1992/0806		char *s; ulong fppc;
1990/0227
1992/0806		fppc = ur->pc; if(ur->cause & (1<<31)) /* branch delay */ fppc += 4; s = 0;
1992/0803		if(fcr31 & (1<<17))
1992/0806		s = "unimplemented operation"; else{ fcr31 >>= 7; /* trap enable bits */ fcr31 &= (fcr31>>5); /* anded with exceptions */ for(i=0; i<5; i++) if(fcr31 & (1<<i))
1992/1129		s = fpcause[i];
1992/0806		} if(s == 0) return "no floating point exception";
1992/1129
1992/0806		sprint(buf, "%s fppc=0x%lux", s, fppc); return buf;
1990/0227		}
1990/03091
1990/0227		void dumpstack(void) { ulong l, v; extern ulong etext;
1992/1129		if(u == 0) return; for(l=(ulong)&l; l<USERADDR+BY2PG; l+=4){ v = *(ulong*)l; if(KTZERO < v && v < (ulong)&etext){ print("%lux=%lux\n", l, v); delay(100);
1990/0227		}
1992/1129		}
1990/0227		} void dumpregs(Ureg *ur) { int i; ulong *l; if(u)
1992/1124		print("registers for %s %d\n", u->p->text, u->p->pid);
1990/0227		else
1992/1124		print("registers for kernel\n");
1992/1129
1990/0227		l = &ur->status;
1992/0319		for(i=0; i<sizeof regname/sizeof(char*); i+=2, l+=2){
1992/1124		print("%s\t%.8lux\t%s\t%.8lux\n", regname[i], l[0], regname[i+1], l[1]); prflush();
1992/0319		}
1990/0227		}
1992/0108		int
1990/0227		notify(Ureg *ur) {
1992/1129		int l; ulong sp;
1991/1218		Note *n;
1990/0227
1991/1110		if(u->p->procctl) procctl(u->p);
1991/1230		if(u->nnote == 0)
1992/0108		return 0;
1991/1114
1992/1129		spllo();
1991/1216		qlock(&u->p->debug);
1991/0727		u->p->notepending = 0;
1991/1218		n = &u->note[0];
1992/1129		if(strncmp(n->msg, "sys:", 4) == 0) {
1991/1218		l = strlen(n->msg); if(l > ERRLEN-15) /* " pc=0x12345678\0" */ l = ERRLEN-15;
1992/1128
1992/0806		sprint(n->msg+l, " pc=0x%lux", ur->pc);
1991/1218		}
1992/1128
1992/1129		if(n->flag != NUser && (u->notified || u->notify==0)) {
1992/0714		if(n->flag == NDebug)
1991/1218		pprint("suicide: %s\n", n->msg);
1992/1128
1991/1216		qunlock(&u->p->debug);
1991/1218		pexit(n->msg, n->flag!=NDebug);
1990/0227		}
1992/1128		if(u->notified) { qunlock(&u->p->debug);
1992/1129		splhi();
1992/1128		return 0;
1990/0227		}
1992/1128		if(!u->notify) { qunlock(&u->p->debug); pexit(n->msg, n->flag!=NDebug); } u->svstatus = ur->status;
1992/1129		sp = ur->usp - sizeof(Ureg);
1992/1128
1992/1129		if(sp&0x3 || !okaddr((ulong)u->notify, BY2WD, 0)
1992/1208		|| !okaddr(sp-ERRLEN-3*BY2WD, sizeof(Ureg)+ERRLEN+3*BY2WD, 1)) {
1992/1128		pprint("suicide: bad address or sp in notify\n"); qunlock(&u->p->debug); pexit("Suicide", 0); }
1992/1129
1992/1128		u->ureg = (void*)sp; memmove((Ureg*)sp, ur, sizeof(Ureg)); sp -= ERRLEN; memmove((char*)sp, u->note[0].msg, ERRLEN); sp -= 3*BY2WD; *(ulong*)(sp+2*BY2WD) = sp+3*BY2WD; /* arg 2 is string */ u->svr1 = ur->r1; /* save away r1 */ ur->r1 = (ulong)u->ureg; /* arg 1 is ureg* */
1993/0225		ur->r1 = (ulong)u->ureg; /* arg 1 (R1) is ureg* */ *(ulong*)(sp+1*BY2WD) = (ulong)u->ureg; /* arg 1 0(FP) is ureg* */
1992/1128		*(ulong*)(sp+0*BY2WD) = 0; /* arg 0 is pc */ ur->usp = sp; ur->pc = (ulong)u->notify; u->notified = 1; u->nnote--; memmove(&u->lastnote, &u->note[0], sizeof(Note)); memmove(&u->note[0], &u->note[1], u->nnote*sizeof(Note));
1991/1216		qunlock(&u->p->debug);
1992/1129		splhi();
1992/1128		return 1;
1990/0227		} /* * Return user to state before notify() */ void
1991/0717		noted(Ureg **urp, ulong arg0)
1990/0227		{
1991/0503		Ureg *nur; nur = u->ureg;
1992/1130		if(nur->status != u->svstatus) {
1991/0717		pprint("bad noted ureg status %lux\n", nur->status);
1991/0503		pexit("Suicide", 0); }
1991/1216		qlock(&u->p->debug);
1992/1129		if(!u->notified) {
1991/1216		qunlock(&u->p->debug);
1991/0814		pprint("call to noted() when not notified\n");
1992/1129		pexit("Suicide", 0);
1990/0619		}
1990/0227		u->notified = 0;
1991/0318		memmove(*urp, u->ureg, sizeof(Ureg));
1992/0102		(*urp)->r1 = u->svr1;
1992/1129		switch(arg0) {
1991/0717		case NCONT:
1992/0616		if(!okaddr(nur->pc, 1, 0) || !okaddr(nur->usp, BY2WD, 0)){
1991/0814		pprint("suicide: trap in noted\n");
1991/1216		qunlock(&u->p->debug);
1992/1129		pexit("Suicide", 0);
1991/0814		}
1991/0717		splhi();
1991/1216		qunlock(&u->p->debug);
1991/0717		rfnote(urp); break; default: pprint("unknown noted arg 0x%lux\n", arg0); u->lastnote.flag = NDebug; /* fall through */
1991/0718		case NDFLT:
1991/0717		if(u->lastnote.flag == NDebug) pprint("suicide: %s\n", u->lastnote.msg);
1991/1216		qunlock(&u->p->debug);
1991/0717		pexit(u->lastnote.msg, u->lastnote.flag!=NDebug); }
1990/0227		}
1991/0731		#include "../port/systab.h"
1990/0227		long syscall(Ureg *aur) { long ret; ulong sp; Ureg *ur;
1992/0407		Proc *p;
1990/0227
1991/0425		m->syscall++;
1992/0407		p = u->p; p->insyscall = 1;
1990/0227		ur = aur;
1992/0805		p->pc = ur->pc;
1991/1110		u->dbgreg = aur;
1992/1130		ur->cause = 15<<2; /* for debugging: system call is undef 15; */
1992/0407		if(p->fpstate == FPactive) {
1992/1129		if((ur->status&CU1) == 0) panic("syscall: FPactive but no CU1");
1991/0314		u->fpsave.fpstatus = fcr31();
1992/0407		p->fpstate = FPinit;
1990/0227		ur->status &= ~CU1; }
1992/1129
1990/0227		spllo();
1991/0705
1992/0803		if(p->procctl) procctl(p);
1992/06271		u->scallnr = ur->r1;
1990/0227		u->nerrlab = 0;
1992/1130		sp = ur->sp;
1990/0227		ret = -1;
1990/0511		if(!waserror()){
1992/06271		if(u->scallnr >= sizeof systab/sizeof systab[0]) { pprint("bad sys call number %d pc %lux\n", u->scallnr, ur->pc);
1992/0625		postnote(p, 1, "sys: bad sys call", NDebug);
1990/11211		error(Ebadarg);
1990/0511		}
1992/0625
1990/0511		if(sp & (BY2WD-1)){
1992/0625		pprint("odd sp in sys call pc %lux sp %lux\n", ur->pc, ur->sp); postnote(p, 1, "sys: odd stack", NDebug); error(Ebadarg);
1990/0511		}
1992/0625		if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-sizeof(Sargs))) validaddr(sp, sizeof(Sargs), 0); u->s = *((Sargs*)(sp+BY2WD));
1992/06271		p->psstate = sysctab[u->scallnr];
1992/0625
1992/06271		ret = (*systab[u->scallnr])(u->s.args);
1992/0803		poperror();
1990/0511		}
1990/0227		ur->pc += 4; u->nerrlab = 0;
1992/0407		p->psstate = 0; p->insyscall = 0;
1992/0803		if(u->scallnr == NOTED) /* ugly hack */
1991/0717		noted(&aur, *(ulong*)(sp+BY2WD)); /* doesn't return */
1992/1129
1991/1114		splhi();
1992/06271		if(u->scallnr!=RFORK && (p->procctl || u->nnote)){
1992/1128		ur->r1 = ret; /* load up for noted() */
1992/0108		if(notify(ur)) return ur->r1;
1990/0227		}
1991/0705
1990/0227		return ret; }
1991/1214		long execregs(ulong entry, ulong ssize, ulong nargs)
1990/1226		{
1991/1214		ulong *sp; sp = (ulong*)(USTKTOP - ssize); *--sp = nargs; ((Ureg*)UREGADDR)->usp = (ulong)sp; ((Ureg*)UREGADDR)->pc = entry - 4; /* syscall advances it */
1992/0805		u->fpsave.fpstatus = initfp.fpstatus;
1991/1214		return USTKTOP-BY2WD; /* address of user-level clock */
1990/0227		}
1992/0120		ulong userpc(void) { return ((Ureg*)UREGADDR)->pc; }
1990/0227		void novme(int v) { static count = 0; print("vme intr 0x%.2x\n", v); count++; if(count >= 10) panic("too many vme intr"); } void setvmevec(int v, void (*f)(int)) { void (*g)(int); v &= 0xff; g = vmevec[v];
1992/0612		if(g && g != novme && g != f)
1990/0227		print("second setvmevec to 0x%.2x\n", v); vmevec[v] = f;
1991/1110		}
1991/1111		/* This routine must save the values of registers the user is not permitted to write
1992/0802		* from devproc and then restore the saved values before returning
1991/1110		*/ void setregisters(Ureg *xp, char *pureg, char *uva, int n) { ulong status; status = xp->status; memmove(pureg, uva, n); xp->status = status;
1990/0227		}