ref: 4308f6e7e6586e3a27aa46c4d54c434b8533b16d
dir: /sys/src/9/alphapc/trap.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "ureg.h"
#include "io.h"
#include "../port/error.h"
void noted(Ureg*, Ureg**, ulong);
void rfnote(Ureg**);
void kernfault(Ureg*, int);
void illegal(Ureg *);
void fen(Ureg *);
char *regname[]={
"type", "a0", "a1",
"a2", "R0", "R1",
"R2", "R3", "R4",
"R5", "R6", "R7",
"R8", "R9", "R10",
"R11", "R12", "R13",
"R14", "R15", "R19",
"R20", "R21", "R22",
"R23", "R24", "R25",
"R26", "R27", "R28",
"R30", "status", "PC",
"R29", "R16", "R17",
"R18",
};
static Lock vctllock;
static Vctl *vctl[256];
void
intrenable(int irq, void (*f)(Ureg*, void*), void* a, int tbdf, char *name)
{
int vno;
Vctl *v;
if(f == nil){
print("intrenable: nil handler for %d, tbdf 0x%uX for %s\n",
irq, tbdf, name);
return;
}
v = xalloc(sizeof(Vctl));
v->isintr = 1;
v->irq = irq;
v->tbdf = tbdf;
v->f = f;
v->a = a;
strncpy(v->name, name, KNAMELEN-1);
v->name[KNAMELEN-1] = 0;
ilock(&vctllock);
vno = arch->intrenable(v);
if(vno == -1){
iunlock(&vctllock);
print("intrenable: couldn't enable irq %d, tbdf 0x%uX for %s\n",
irq, tbdf, v->name);
xfree(v);
return;
}
if(vctl[vno]){
if(vctl[vno]->isr != v->isr || vctl[vno]->eoi != v->eoi)
panic("intrenable: handler: %s %s %#p %#p %#p %#p",
vctl[vno]->name, v->name,
vctl[vno]->isr, v->isr, vctl[vno]->eoi, v->eoi);
v->next = vctl[vno];
}
vctl[vno] = v;
iunlock(&vctllock);
}
int
intrdisable(int irq, void (*f)(Ureg *, void *), void *a, int tbdf, char *name)
{
Vctl **pv, *v;
int vno;
/*
* For now, none of this will work with the APIC code,
* there is no mapping between irq and vector as the IRQ
* is pretty meaningless.
*/
if(arch->intrvecno == nil)
return -1;
vno = arch->intrvecno(irq);
ilock(&vctllock);
for(pv = &vctl[vno]; *pv != nil; pv = &((*pv)->next)){
if((*pv)->irq != irq)
continue;
if((*pv)->tbdf != tbdf)
continue;
if((*pv)->f != f)
continue;
if((*pv)->a != a)
continue;
if(strcmp((*pv)->name, name) != 0)
continue;
break;
}
assert(*pv != nil);
v = *pv;
*pv = (*pv)->next; /* Link out the entry */
if (vctl[vno] == nil && arch->intrdisable != nil)
arch->intrdisable(irq);
iunlock(&vctllock);
xfree(v);
return 0;
}
int
irqallocread(char *buf, long n, vlong offset)
{
int vno;
Vctl *v;
long oldn;
char str[11+1+KNAMELEN+1], *p;
int m;
if(n < 0 || offset < 0)
error(Ebadarg);
oldn = n;
for(vno=0; vno<nelem(vctl); vno++){
for(v=vctl[vno]; v; v=v->next){
m = snprint(str, sizeof str, "%11d %11d %.*s\n", vno, v->irq, KNAMELEN, v->name);
if(m <= offset) /* if do not want this, skip entry */
offset -= m;
else{
/* skip offset bytes */
m -= offset;
p = str+offset;
offset = 0;
/* write at most max(n,m) bytes */
if(m > n)
m = n;
memmove(buf, p, m);
n -= m;
buf += m;
if(n == 0)
return oldn;
}
}
}
return oldn - n;
}
typedef struct Mcheck Mcheck;
struct Mcheck
{
ulong len;
ulong inprogress;
ulong procoff;
ulong sysoff;
ulong code;
};
static char *
smcheck(ulong code)
{
switch (code) {
case 0x80: return "tag parity error";
case 0x82: return "tag control parity error";
case 0x84: return "generic hard error";
case 0x86: return "correctable ECC error";
case 0x88: return "uncorrectable ECC error";
case 0x8a: return "OS-specific PAL bugcheck";
case 0x90: return "callsys in kernel mode";
case 0x96: return "i-cache read retryable error";
case 0x98: return "processor detected hard error";
case 0x203: return "system detected uncorrectable ECC error";
case 0x205: return "parity error detected by CIA";
case 0x207: return "non-existent memory error";
case 0x209: return "PCI SERR detected";
case 0x20b: return "PCI data parity error detected";
case 0x20d: return "PCI address parity error detected";
case 0x20f: return "PCI master abort error";
case 0x211: return "PCI target abort error";
case 0x213: return "scatter/gather PTE invalid error";
case 0x215: return "flash ROM write error";
case 0x217: return "IOA timeout detected";
case 0x219: return "IOCHK#, EISA add-in board parity or other catastrophic error";
case 0x21b: return "EISA fail-safe timer timeout";
case 0x21d: return "EISA bus time-out";
case 0x21f: return "EISA software generated NMI";
case 0x221: return "unexpected ev5 IRQ[3] interrupt";
default: return "unknown mcheck";
}
}
void
mcheck(Ureg *ur, void *x)
{
Mcheck *m;
uvlong *data;
int i, col;
m = x;
data = x;
iprint("panic: Machine Check @%#p: %s (%lux) len %lud\n",
m, smcheck(m->code), m->code, m->len);
iprint("proc offset %lux sys offset %lux\n", m->procoff, m->sysoff);
for (i = 0, col = 0; i < m->len/8; i++) {
iprint("%.3x: %.16llux%s", 8*i, data[i], (col == 2) ? "\n" : " ");
if (col++ == 2)
col = 0;
}
if(col != 2)
print("\n");
print("\n");
dumpregs(ur);
prflush();
firmware();
}
void
intr(Ureg *ur)
{
int i, vno;
Vctl *ctl, *v;
Mach *mach;
vno = (ulong)ur->a1>>4;
vno -= 0x80;
if(vno < nelem(vctl) && (ctl = vctl[vno])){
if(ctl->isintr){
m->intr++;
if(vno >= VectorPIC && vno <= MaxVectorPIC)
m->lastintr = vno-VectorPIC;
}
if(ctl->isr)
ctl->isr(vno);
for(v = ctl; v != nil; v = v->next) {
if(v->f)
v->f(ur, v->a);
}
if(ctl->eoi)
ctl->eoi(vno);
if(ctl->isintr && up)
preempted();
}
else if(vno >= VectorPIC && vno <= MaxVectorPIC){
/*
* An unknown interrupt.
* Check for a default IRQ7. This can happen when
* the IRQ input goes away before the acknowledge.
* In this case, a 'default IRQ7' is generated, but
* the corresponding bit in the ISR isn't set.
* In fact, just ignore all such interrupts.
*/
iprint("cpu%d: spurious interrupt %d, last %d",
m->machno, vno-VectorPIC, m->lastintr);
for(i = 0; i < MAXMACH; i++){
if(active.machs[i] == 0)
continue;
mach = MACHP(i);
if(m->machno == mach->machno)
continue;
iprint(": cpu%d: last %d", mach->machno, mach->lastintr);
}
iprint("\n");
m->spuriousintr++;
return;
}
else{
dumpregs(ur);
print("unknown intr: %d\n", vno); /* */
}
}
void
trap(Ureg *ur)
{
char buf[ERRMAX];
int clockintr, user, x;
user = ur->status&UMODE;
if(user){
up = m->proc;
up->dbgreg = ur;
}
clockintr = 0;
switch ((int)ur->type) {
case 1: /* arith */
fptrap(ur);
break;
case 2: /* bad instr or FEN */
illegal(ur);
break;
case 3: /* intr */
m->intr++;
switch ((int)ur->a0) {
case 0: /* interprocessor */
panic("interprocessor intr");
break;
case 1: /* clock */
clockintr = 1;
clock(ur);
break;
case 2: /* machine check */
mcheck(ur, (void*)(KZERO|(ulong)ur->a2));
break;
case 3: /* device */
intr(ur);
break;
case 4: /* perf counter */
panic("perf count");
break;
default:
panic("bad intr");
break;
}
break;
case 4: /* memory fault */
if(up == 0)
kernfault(ur, (ulong)ur->a1);
x = up->insyscall;
up->insyscall = 1;
spllo();
faultalpha(ur);
up->insyscall = x;
break;
case 6: /* alignment fault */
ur->pc -= 4;
sprint(buf, "trap: unaligned addr 0x%lux", (ulong)ur->a0);
fataltrap(ur, buf);
break;
default: /* cannot happen */
panic("bad trap type %d", (int)ur->type);
break;
}
splhi();
/* delaysched set because we held a lock or because our quantum ended */
if(up && up->delaysched && clockintr){
sched();
splhi();
}
if(user){
if(up->procctl || up->nnote)
notify(ur);
kexit(ur);
}
}
void
trapinit(void)
{
splhi();
wrent(0, intr0);
wrent(1, arith);
wrent(2, fault0);
wrent(3, illegal0);
wrent(4, unaligned);
wrent(5, syscall0);
}
void
fataltrap(Ureg *ur, char *reason)
{
char buf[ERRMAX];
if(ur->status&UMODE) {
spllo();
sprint(buf, "sys: %s", reason);
postnote(up, 1, buf, NDebug);
return;
}
print("kernel %s pc=%lux\n", reason, (ulong)ur->pc);
dumpregs(ur);
dumpstack();
if(m->machno == 0)
spllo();
exit(1);
}
void
kernfault(Ureg *ur, int code)
{
Label l;
char *s;
splhi();
if (code == 0)
s = "read";
else if (code == 1)
s = "write";
else
s = "ifetch";
print("panic: kfault %s VA=0x%lux\n", s, (ulong)ur->a0);
print("u=%#p status=0x%lux pc=0x%lux sp=0x%lux\n",
up, (ulong)ur->status, (ulong)ur->pc, (ulong)ur->sp);
dumpregs(ur);
l.sp = ur->sp;
l.pc = ur->pc;
dumpstack();
exit(1);
}
void
dumpregs(Ureg *ur)
{
int i, col;
uvlong *l;
if(up)
print("registers for %s %ld\n", up->text, up->pid);
else
print("registers for kernel\n");
l = &ur->type;
col = 0;
for (i = 0; i < sizeof regname/sizeof(char*); i++, l++) {
print("%-7s%.16llux%s", regname[i], *l, col == 2 ? "\n" : " ");
if (col++ == 2)
col = 0;
}
print("\n");
}
/*
* Fill in enough of Ureg to get a stack trace, and call a function.
* Used by debugging interface rdb.
*/
static void
getpcsp(ulong *pc, ulong *sp)
{
*pc = getcallerpc(&pc);
*sp = (ulong)&pc-8;
}
void
callwithureg(void (*fn)(Ureg*))
{
Ureg ureg;
getpcsp((ulong*)&ureg.pc, (ulong*)&ureg.sp);
ureg.r26 = getcallerpc(&fn);
fn(&ureg);
}
void
_dumpstack(Ureg *ureg)
{
ulong l, sl, el, v, i, instr, op;
extern ulong etext;
l=(ulong)&l;
if(l&4)
l += 4;
if(up == 0){
el = (ulong)m+BY2PG;
sl = el-KSTACK;
}
else{
sl = (ulong)up->kstack;
el = sl + KSTACK;
}
if(l > el || l < sl){
el = (ulong)m+BY2PG;
sl = el-KSTACK;
}
if(l > el || l < sl)
return;
print("ktrace /kernel/path %.8lux %.8lux %.8lux\n", (ulong)ureg->pc, (ulong)ureg->sp, (ulong)ureg->r26);
i = 0;
for(; l<el; l+=8){
v = *(ulong*)l - 4;
if(KTZERO < v && v < (ulong)&etext && (v&3) == 0){
/*
* Check for JSR/BSR
*/
instr = *(ulong*)v;
op = (instr>>26);
if(op == 26 || op == 52){
print("%lux=%lux ", l, v);
i++;
}
}
if(i == 4){
i = 0;
print("\n");
}
}
if(i)
print("\n");
}
void
dumpstack(void)
{
callwithureg(_dumpstack);
}
int
notify(Ureg *ur)
{
int l;
ulong sp;
Note *n;
if(up->procctl)
procctl();
if(up->nnote == 0)
return 0;
if(up->fpstate == FPactive){
savefpregs(&up->fpsave);
up->fpstate = FPinactive;
}
up->fpstate |= FPillegal;
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-15) /* " pc=0x12345678\0" */
l = ERRMAX-15;
sprint(n->msg+l, " pc=0x%lux", (ulong)ur->pc);
}
if(n->flag != NUser && (up->notified || up->notify==0)) {
qunlock(&up->debug);
if(n->flag == NDebug)
pprint("suicide: %s\n", n->msg);
pexit(n->msg, n->flag!=NDebug);
}
if(up->notified) {
qunlock(&up->debug);
splhi();
return 0;
}
if(!up->notify) {
qunlock(&up->debug);
pexit(n->msg, n->flag!=NDebug);
}
sp = ur->usp & ~(BY2V-1);
sp -= sizeof(Ureg);
if(!okaddr((uintptr)up->notify, BY2WD, 0)
|| !okaddr(sp-ERRMAX-6*BY2WD, sizeof(Ureg)+ERRMAX-6*BY2WD, 1)) {
qunlock(&up->debug);
pprint("suicide: bad address or sp in notify\n");
pexit("Suicide", 0);
}
memmove((Ureg*)sp, ur, sizeof(Ureg));
*(Ureg**)(sp-BY2WD) = up->ureg; /* word under Ureg is old up->ureg */
up->ureg = (void*)sp;
sp -= 2*BY2WD+ERRMAX;
memmove((char*)sp, up->note[0].msg, ERRMAX);
sp -= 4*BY2WD;
*(ulong*)(sp+3*BY2WD) = sp+4*BY2WD; /* arg 2 is string */
ur->r0 = (ulong)up->ureg; /* arg 1 (R0) is ureg* */
*(ulong*)(sp+2*BY2WD) = (ulong)up->ureg; /* arg 1 0(FP) is ureg* */
*(ulong*)(sp+0*BY2WD) = 0; /* arg 0 is pc */
ur->usp = sp;
ur->pc = (ulong)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);
splhi();
return 1;
}
/*
* Check that status is OK to return from note.
*/
int
validstatus(ulong kstatus, ulong ustatus)
{
if((kstatus & 7) != (ustatus & 7))
return 0;
if((ustatus&UMODE) != UMODE)
return 0;
return 1;
}
/*
* Return user to state before notify()
*/
void
noted(Ureg *kur, Ureg **urp, ulong arg0)
{
Ureg *nur;
ulong oureg, sp;
qlock(&up->debug);
if(arg0!=NRSTR && !up->notified) {
qunlock(&up->debug);
pprint("call to noted() when not notified\n");
pexit("Suicide", 0);
}
up->notified = 0;
up->fpstate &= ~FPillegal;
nur = up->ureg;
oureg = (ulong)nur;
if((oureg & (BY2V-1))
|| !okaddr(oureg-BY2WD, BY2WD+sizeof(Ureg), 0)){
qunlock(&up->debug);
pprint("bad ureg in noted or call to noted() when not notified\n");
pexit("Suicide", 0);
}
if(!validstatus(kur->status, nur->status)) {
qunlock(&up->debug);
pprint("bad noted ureg status %lux\n", (ulong)nur->status);
pexit("Suicide", 0);
}
memmove(*urp, up->ureg, sizeof(Ureg));
switch(arg0) {
case NCONT:
case NRSTR:
if(!okaddr(nur->pc, BY2WD, 0) || !okaddr(nur->usp, BY2WD, 0)){
qunlock(&up->debug);
pprint("suicide: trap in noted\n");
pexit("Suicide", 0);
}
up->ureg = (Ureg*)(*(ulong*)(oureg-BY2WD));
qunlock(&up->debug);
splhi();
rfnote(urp);
break;
case NSAVE:
if(!okaddr(nur->pc, BY2WD, 0) || !okaddr(nur->usp, BY2WD, 0)){
qunlock(&up->debug);
pprint("suicide: trap in noted\n");
pexit("Suicide", 0);
}
qunlock(&up->debug);
sp = oureg-4*BY2WD-ERRMAX;
splhi();
(*urp)->sp = sp;
((ulong*)sp)[1] = oureg; /* arg 1 0(FP) is ureg* */
((ulong*)sp)[0] = 0; /* arg 0 is pc */
(*urp)->r0 = oureg; /* arg 1 is ureg* */
rfnote(urp);
break;
default:
up->lastnote.flag = NDebug;
/* fall through */
case NDFLT:
qunlock(&up->debug);
if(up->lastnote.flag == NDebug)
pprint("suicide: %s\n", up->lastnote.msg);
pexit(up->lastnote.msg, up->lastnote.flag!=NDebug);
}
}
#include "../port/systab.h"
long
syscall(Ureg *aur)
{
int i;
char *e;
long ret;
ulong sp;
Ureg *ur;
ulong scallnr;
m->syscall++;
up = m->proc;
up->insyscall = 1;
ur = aur;
up->pc = ur->pc;
up->dbgreg = aur;
ur->type = 5; /* for debugging */
scallnr = ur->r0;
up->scallnr = ur->r0;
spllo();
sp = ur->sp;
up->nerrlab = 0;
ret = -1;
if(!waserror()) {
if(scallnr >= nsyscall || systab[scallnr] == nil){
pprint("bad sys call %d pc %lux\n", up->scallnr, (ulong)ur->pc);
postnote(up, 1, "sys: bad sys call", NDebug);
error(Ebadarg);
}
if(sp & (BY2WD-1)){ /* XXX too weak? */
pprint("odd sp in sys call pc %lux sp %lux\n",
(ulong)ur->pc, (ulong)ur->sp);
postnote(up, 1, "sys: odd stack", NDebug);
error(Ebadarg);
}
if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-sizeof(Sargs)))
validaddr(sp, sizeof(Sargs), 0);
up->s = *((Sargs*)(sp+2*BY2WD));
up->psstate = sysctab[scallnr];
ret = systab[scallnr]((va_list)up->s.args);
poperror();
}else{
/* failure: save the error buffer for errstr */
e = up->syserrstr;
up->syserrstr = up->errstr;
up->errstr = e;
}
if(up->nerrlab){
print("bad errstack [%uld]: %d extra\n", scallnr, up->nerrlab);
for(i = 0; i < NERR; i++)
print("sp=%lux pc=%lux\n",
up->errlab[i].sp, up->errlab[i].pc);
panic("error stack");
}
up->nerrlab = 0;
up->psstate = 0;
up->insyscall = 0;
if(scallnr == NOTED) /* ugly hack */
noted(ur, &aur, *(ulong*)(sp+2*BY2WD)); /* doesn't return */
if(scallnr!=RFORK && (up->procctl || up->nnote)){
ur->r0 = ret; /* load up for noted() */
if(notify(ur))
return ur->r0;
}
return ret;
}
void
forkchild(Proc *p, Ureg *ur)
{
Ureg *cur;
p->sched.sp = (ulong)p->kstack+KSTACK-(4*BY2WD+sizeof(Ureg));
p->sched.pc = (ulong)forkret;
cur = (Ureg*)(p->sched.sp+4*BY2WD);
memmove(cur, ur, sizeof(Ureg));
/* Things from bottom of syscall we never got to execute */
p->psstate = 0;
p->insyscall = 0;
}
static
void
linkproc(void)
{
spllo();
up->kpfun(up->kparg);
pexit("kproc exiting", 0);
}
void
kprocchild(Proc *p, void (*func)(void*), void *arg)
{
p->sched.pc = (ulong)linkproc;
p->sched.sp = (ulong)p->kstack+KSTACK;
p->kpfun = func;
p->kparg = arg;
}
uintptr
execregs(uintptr entry, ulong ssize, ulong nargs)
{
Ureg *ur;
ulong *sp;
sp = (ulong*)(USTKTOP - ssize);
*--sp = nargs;
ur = (Ureg*)up->dbgreg;
ur->usp = (ulong)sp;
ur->pc = entry;
return USTKTOP-BY2WD; /* address of user-level clock */
}
uintptr
userpc(void)
{
Ureg *ur;
ur = (Ureg*)up->dbgreg;
return ur->pc;
}
/* This routine must save the values of registers the user is not permitted to write
* from devproc and then restore the saved values before returning
*/
void
setregisters(Ureg *xp, char *pureg, char *uva, int n)
{
ulong status;
status = xp->status;
memmove(pureg, uva, n);
xp->status = status;
}
/* Give enough context in the ureg to produce a kernel stack for
* a sleeping process
*/
void
setkernur(Ureg *xp, Proc *p)
{
xp->pc = p->sched.pc;
xp->sp = p->sched.sp;
xp->r26 = (ulong)sched;
}
uintptr
dbgpc(Proc *p)
{
Ureg *ur;
ur = p->dbgreg;
if(ur == 0)
return 0;
return ur->pc;
}
void
illegal(Ureg *ur)
{
switch ((int)ur->a0) {
case 0: /* breakpoint */
ur->pc -= 4;
fataltrap(ur, "breakpoint");
break;
case 1: /* bugchk */
fataltrap(ur, "trap: bugchk");
break;
case 2: /* gentrap */
fataltrap(ur, "trap: gentrap");
break;
case 3: /* FEN */
fen(ur);
break;
case 4: /* opDEC */
fataltrap(ur, "trap: illegal instruction");
break;
default:
panic("illegal illegal %d", (int)ur->a0);
break;
}
}
void
fen(Ureg *ur)
{
if(up){
switch(up->fpstate){
case FPinit:
restfpregs(&initfp);
up->fpstate = FPactive;
//print("EI=%lux+", initfp.fpstatus);
return;
case FPinactive:
restfpregs(&up->fpsave);
up->fpstate = FPactive;
//print("EIA=%lux+", up->fpsave.fpstatus);
return;
}
}
fataltrap(ur, "trap: floating enable"); /* should never happen */
}