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-rw-r--r--os/manga/trap.c498
1 files changed, 498 insertions, 0 deletions
diff --git a/os/manga/trap.c b/os/manga/trap.c
new file mode 100644
index 00000000..1ac808ba
--- /dev/null
+++ b/os/manga/trap.c
@@ -0,0 +1,498 @@
+#include "u.h"
+#include "../port/lib.h"
+#include "mem.h"
+#include "dat.h"
+#include "fns.h"
+#include "io.h"
+#include "ureg.h"
+#include "../port/error.h"
+
+#define waslo(sr) (!((sr) & (PsrDirq|PsrDfiq)))
+
+enum
+{
+ MaxVector= 32, /* determined by bits per word */
+ Maxhandler= MaxVector+5 /* max number of interrupt handlers, assuming a few shared */
+};
+
+typedef struct Handler Handler;
+struct Handler {
+ void (*r)(Ureg*, void*);
+ void* a;
+ char name[KNAMELEN];
+ Handler* next;
+ int edge;
+ ulong nintr;
+ ulong ticks;
+ int maxtick;
+};
+
+static Lock veclock;
+
+static struct
+{
+ Handler *ivec[MaxVector];
+ Handler h[Maxhandler];
+ int free;
+ Handler* freelist;
+} halloc;
+
+Instr BREAK = 0xE6BAD010;
+
+int (*breakhandler)(Ureg*, Proc*);
+int (*catchdbg)(Ureg *, uint);
+
+extern void (*serwrite)(char *, int);
+
+void
+intrenable(int sort, int v, void (*r)(Ureg*, void*), void* a, char *name)
+{
+ int o, x;
+ ulong f;
+ GpioReg *g;
+ Handler *h;
+
+ USED(sort);
+ f = v;
+ v &= IRQmask;
+ if(v >= nelem(halloc.ivec))
+ panic("intrenable(%d)", v);
+ ilock(&veclock);
+ if(v >= IRQext0 && v <= IRQtm1){
+ /* need to switch GPIO pins, set mode */
+ g = GPIOREG;
+ if(v <= IRQext3){ /* choice of interrupt type */
+ o = (v-IRQext0)*4; /* b mmm */
+ g->iopc = (g->iopc & ~(7<<o)) | (1<<(o+3)) | ((f>>8)&7)<<o;
+ o = v - IRQext0;
+ if(f & IRQsoft)
+ g->iopm |= 1<<o; /* soft interrupt uses GPIO as output */
+ else
+ g->iopm &= ~(1<<o);
+ }else
+ g->iopc |= 1<<(16+(v-IRQtm0));
+ if(0)
+ iprint("v=%d iopc=%8.8lux iopm=%8.8lux\n", v, g->iopc, g->iopm);
+ }
+ if((h = halloc.freelist) == nil){
+ if(halloc.free >= Maxhandler){
+ iunlock(&veclock);
+ panic("out of interrupt handlers"); /* can't happen */
+ }
+ h = &halloc.h[halloc.free++];
+ }else
+ halloc.freelist = h->next;
+ h->r = r;
+ h->a = a;
+ strncpy(h->name, name, KNAMELEN-1);
+ h->name[KNAMELEN-1] = 0;
+ h->next = halloc.ivec[v];
+ halloc.ivec[v] = h;
+
+ /* enable the corresponding interrupt in the controller */
+ x = splfhi();
+ INTRREG->st = 1<<v;
+ INTRREG->en |= 1<<v;
+ splx(x);
+ iunlock(&veclock);
+}
+
+void
+intrdisable(int sort, int v, void (*r)(Ureg*, void*), void* a, char *name)
+{
+ int x, o;
+ GpioReg *g;
+ Handler *h, **hp;
+
+ USED(sort);
+ v &= IRQmask;
+ if(v >= nelem(halloc.ivec))
+ panic("intrdisable(%d)", v);
+ ilock(&veclock);
+ for(hp = &halloc.ivec[v]; (h = *hp) != nil; hp = &h->next)
+ if(h->r == r && h->a == a && strcmp(h->name, name) == 0){
+ *hp = h->next;
+ h->r = nil;
+ h->next = halloc.freelist;
+ halloc.freelist = h;
+ break;
+ }
+ if(halloc.ivec[v] == nil){
+ if(v >= IRQext0 && v <= IRQtm1){
+ /* need to reset GPIO pins */
+ g = GPIOREG;
+ if(v <= IRQext3){ /* choice of interrupt type */
+ o = (v-IRQext0)*4; /* b mmm */
+ g->iopc &= ~(0xF<<o);
+ g->iopm &= ~(v-IRQext0); /* force to input */
+ }else
+ g->iopc &= ~(1<<(16+(v-IRQtm0)));
+ }
+ x = splfhi();
+ INTRREG->en &= ~(1<<v);
+ splx(x);
+ }
+ iunlock(&veclock);
+}
+
+static void
+intrs(Ureg *ur, ulong ibits)
+{
+ Handler *h;
+ int i, s;
+
+ for(i=0; i<nelem(halloc.ivec) && ibits; i++)
+ if(ibits & (1<<i)){
+ h = halloc.ivec[i];
+ for(; h != nil; h = h->next){
+ INTRREG->st = 1<<i; /* reset edge; has no effect on level interrupts */
+ h->r(ur, h->a);
+ ibits &= ~(1<<i);
+ }
+ }
+ if(ibits != 0){
+ iprint("spurious irq interrupt: %8.8lux\n", ibits);
+ s = splfhi();
+ INTRREG->en &= ~ibits;
+ splx(s);
+ }
+}
+
+/*
+ * initialise R13 in each trap mode, at the start and after suspend reset.
+ */
+void
+trapstacks(void)
+{
+ setr13(PsrMfiq, m->fiqstack+nelem(m->fiqstack));
+ setr13(PsrMirq, m->irqstack+nelem(m->irqstack));
+ setr13(PsrMabt, m->abtstack+nelem(m->abtstack));
+ setr13(PsrMund, m->undstack+nelem(m->undstack));
+}
+
+void
+trapinit(void)
+{
+ IntrReg *intr;
+
+ intr = INTRREG;
+ intr->mc = 0; /* all IRQ not FIQ */
+ intr->en = 0; /* disable everything */
+ intr->st = intr->st; /* reset edges */
+
+ trapstacks();
+
+ memmove(page0->vectors, vectors, sizeof(page0->vectors));
+ memmove(page0->vtable, vtable, sizeof(page0->vtable));
+ dcflush(page0, sizeof(*page0));
+
+ icflushall();
+}
+
+static char *trapnames[PsrMask+1] = {
+ [ PsrMfiq ] "Fiq interrupt",
+ [ PsrMirq ] "Mirq interrupt",
+ [ PsrMsvc ] "SVC/SWI Exception",
+ [ PsrMabt ] "Prefetch Abort/Data Abort",
+ [ PsrMabt+1 ] "Data Abort",
+ [ PsrMund ] "Undefined instruction",
+ [ PsrMsys ] "Sys trap"
+};
+
+static char *
+trapname(int psr)
+{
+ char *s;
+
+ s = trapnames[psr & PsrMask];
+ if(s == nil)
+ s = "Undefined trap";
+ return s;
+}
+
+static void
+sys_trap_error(int type)
+{
+ char errbuf[ERRMAX];
+ sprint(errbuf, "sys: trap: %s\n", trapname(type));
+ error(errbuf);
+}
+
+static void
+faultarm(Ureg *ureg, ulong far)
+{
+ char buf[ERRMAX];
+
+ sprint(buf, "sys: trap: fault pc=%8.8lux addr=0x%lux", (ulong)ureg->pc, far);
+ if(1){
+ iprint("%s\n", buf);
+ dumpregs(ureg);
+ }
+ if(far == ~0)
+ disfault(ureg, "dereference of nil");
+ disfault(ureg, buf);
+}
+
+/*
+ * All traps come here. It might be slightly slower to have all traps call trap
+ * rather than directly vectoring the handler.
+ * However, this avoids a lot of code duplication and possible bugs.
+ * trap is called splfhi().
+ */
+void
+trap(Ureg* ureg)
+{
+ ulong far, fsr;
+ int t, itype;
+ Proc *oup;
+
+ /*
+ * All interrupts/exceptions should be resumed at ureg->pc-4,
+ * except for Data Abort which resumes at ureg->pc-8.
+ */
+ itype = ureg->type;
+ if(itype == PsrMabt+1)
+ ureg->pc -= 8;
+ else
+ ureg->pc -= 4;
+ ureg->sp = (ulong)(ureg+1);
+ if(itype == PsrMfiq){ /* fast interrupt (eg, profiler) */
+ oup = up;
+ up = nil;
+ intrs(ureg, INTRREG->ms & INTRREG->mc); /* just FIQ ones */
+ up = oup;
+ return;
+ }
+
+ /* All other traps */
+
+ if(up){
+ up->pc = ureg->pc;
+ up->dbgreg = ureg;
+ }
+ switch(itype) {
+ case PsrMirq:
+ t = m->ticks; /* CPU time per proc */
+ up = nil; /* no process at interrupt level */
+ splflo(); /* allow fast interrupts */
+ intrs(ureg, INTRREG->ms & ~INTRREG->mc); /* just IRQ */
+ up = m->proc;
+ preemption(m->ticks - t);
+ break;
+
+ case PsrMund: /* Undefined instruction */
+ if(*(ulong*)ureg->pc == BREAK && breakhandler) {
+ int s;
+ Proc *p;
+
+ p = up;
+ /* if(!waslo(ureg->psr) || ureg->pc >= (ulong)splhi && ureg->pc < (ulong)islo)
+ p = 0; */
+ s = breakhandler(ureg, p);
+ if(s == BrkSched) {
+ p->preempted = 0;
+ sched();
+ } else if(s == BrkNoSched) {
+ p->preempted = 1; /* stop it being preempted until next instruction */
+ if(up)
+ up->dbgreg = 0;
+ return;
+ }
+ break;
+ }
+ if(up == nil)
+ goto faultpanic;
+ spllo();
+ if(waserror()) {
+ if(waslo(ureg->psr) && up->type == Interp)
+ disfault(ureg, up->env->errstr);
+ setpanic();
+ dumpregs(ureg);
+ panic("%s", up->env->errstr);
+ }
+ if(!fpiarm(ureg)) {
+ dumpregs(ureg);
+ sys_trap_error(ureg->type);
+ }
+ poperror();
+ break;
+
+ case PsrMsvc: /* Jump through 0 or SWI */
+ if(waslo(ureg->psr) && up && up->type == Interp) {
+ spllo();
+ dumpregs(ureg);
+ sys_trap_error(ureg->type);
+ }
+ setpanic();
+ dumpregs(ureg);
+ panic("SVC/SWI exception");
+ break;
+
+ case PsrMabt: /* Prefetch abort */
+ if(catchdbg && catchdbg(ureg, 0))
+ break;
+ /* FALL THROUGH */
+ case PsrMabt+1: /* Data abort */
+ fsr = mmugetfsr();
+ far = mmugetfar();
+ if(fsr & (1<<9)) {
+ mmuputfsr(fsr & ~(1<<9));
+ if(catchdbg && catchdbg(ureg, fsr))
+ break;
+ print("Debug/");
+ }
+ if(waslo(ureg->psr) && up && up->type == Interp) {
+ spllo();
+ faultarm(ureg, far);
+ }
+ iprint("Data Abort: FSR %8.8luX FAR %8.8luX\n", fsr, far); xdelay(500);serialputs("\n", 1);
+ /* FALL THROUGH */
+
+ default: /* ??? */
+faultpanic:
+ setpanic();
+ dumpregs(ureg);
+ panic("exception %uX %s\n", ureg->type, trapname(ureg->type));
+ break;
+ }
+
+ splhi();
+ if(up)
+ up->dbgreg = 0; /* becomes invalid after return from trap */
+}
+
+void
+setpanic(void)
+{
+ if(breakhandler != 0) /* don't mess up debugger */
+ return;
+/*
+ INTRREG->en = 0;
+ spllo();
+*/
+ splhi();
+ GPIOREG->iopd &= ~(1<<GPIO_status_orange_o);
+ consoleprint = 1;
+ serwrite = serialputs;
+}
+
+int
+isvalid_va(void *v)
+{
+ return (ulong)v >= KZERO && (ulong)v <= (ulong)KADDR(conf.topofmem-1);
+}
+
+void
+dumplongs(char *msg, ulong *v, int n)
+{
+ int i, l;
+
+ l = 0;
+ iprint("%s at %.8p: ", msg, v);
+ for(i=0; i<n; i++){
+ if(l >= 4){
+ iprint("\n %.8p: ", v);
+ l = 0;
+ }
+ if(isvalid_va(v)){
+ iprint(" %.8lux", *v++);
+ l++;
+ }else{
+ iprint(" invalid");
+ break;
+ }
+ }
+ iprint("\n");
+}
+
+static void
+_dumpstack(Ureg *ureg)
+{
+ ulong v, *l, *estack;
+ int i;
+
+ l = (ulong*)(ureg+1);
+ if((ulong)l & 3){
+ iprint("invalid ureg/stack: %.8p\n", l);
+ return;
+ }
+ iprint("dumpstack\n");
+ print("ktrace /kernel/path %.8ux %.8ux %.8ux\n", ureg->pc, ureg->sp, ureg->r14);
+ if(up != nil && l >= (ulong*)up->kstack && l <= (ulong*)(up->kstack+KSTACK-4))
+ estack = (ulong*)(up->kstack+KSTACK);
+ else if(l >= (ulong*)m->stack && l <= (ulong*)((ulong)m+BY2PG-4))
+ estack = (ulong*)((ulong)m+BY2PG-4);
+ else{
+ iprint("unknown stack %8.8p\n", l);
+ return;
+ }
+ iprint("estackx %8.8p\n", estack);
+ i = 0;
+ for(; l<estack; l++) {
+ v = *l;
+ if(KTZERO < v && v < (ulong)etext){
+ iprint("%8.8p=%8.8lux ", l, v);
+ if(i++ == 4){
+ iprint("\n");
+ i = 0;
+ }
+ }
+ }
+ if(i)
+ print("\n");
+}
+
+void
+dumpregs(Ureg* ureg)
+{
+ print("TRAP: %s", trapname(ureg->type));
+ if((ureg->psr & PsrMask) != PsrMsvc)
+ print(" in %s", trapname(ureg->psr));
+ print("\n");
+ print("PSR %8.8uX type %2.2uX PC %8.8uX LINK %8.8uX\n",
+ ureg->psr, ureg->type, ureg->pc, ureg->link);
+ print("R14 %8.8uX R13 %8.8uX R12 %8.8uX R11 %8.8uX R10 %8.8uX\n",
+ ureg->r14, ureg->r13, ureg->r12, ureg->r11, ureg->r10);
+ print("R9 %8.8uX R8 %8.8uX R7 %8.8uX R6 %8.8uX R5 %8.8uX\n",
+ ureg->r9, ureg->r8, ureg->r7, ureg->r6, ureg->r5);
+ print("R4 %8.8uX R3 %8.8uX R2 %8.8uX R1 %8.8uX R0 %8.8uX\n",
+ ureg->r4, ureg->r3, ureg->r2, ureg->r1, ureg->r0);
+ print("Stack is at: %8.8luX\n", ureg);
+ print("PC %8.8lux LINK %8.8lux\n", (ulong)ureg->pc, (ulong)ureg->link);
+
+ if(up)
+ print("Process stack: %8.8lux-%8.8lux\n",
+ up->kstack, up->kstack+KSTACK-4);
+ else
+ print("System stack: %8.8lux-%8.8lux\n",
+ (ulong)(m+1), (ulong)m+BY2PG-4);
+ dumplongs("stack", (ulong *)(ureg + 1), 16);
+ _dumpstack(ureg);
+}
+
+/*
+ * Fill in enough of Ureg to get a stack trace, and call a function.
+ * Used by debugging interface rdb.
+ */
+void
+callwithureg(void (*fn)(Ureg*))
+{
+ Ureg ureg;
+ ureg.pc = getcallerpc(&fn);
+ ureg.sp = (ulong)&fn;
+ ureg.r14 = 0;
+ fn(&ureg);
+}
+
+void
+dumpstack(void)
+{
+return;
+ callwithureg(_dumpstack);
+}
+
+void
+trapspecial(int (*f)(Ureg *, uint))
+{
+ catchdbg = f;
+}
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