xref: /inferno-os/os/boot/puma/trap.c (revision 74a4d8c26dd3c1e9febcb717cfd6cb6512991a7a)

#include "boot.h"

typedef struct IrqEntry {
		void	(*r)(Ureg*, void*);
		void 	*a;
} IrqEntry;

IrqEntry Irq[V_MAXNUM+1];

static void dumpstk(ulong *);
void dumpregs(Ureg* ureg);

void
setvec(int v, void (*f)(Ureg*, void*), void* a)
{
	if(v < 0 || v >= V_MAXNUM)
		panic("setvec: interrupt source %d out of range\n", v);
	Irq[v].r = f;
	Irq[v].a = a;
}

ulong irqstack[64];
ulong fiqstack[64];
ulong abtstack[64];
ulong undstack[64];

static void
safeintr(Ureg*, void *a)
{
	int v = (int)a;
//	print("spurious interrupt %d\n", v);
	USED(v);
}

void
trapinit(void)
{
	int offset;
	ulong op;
	int v;
	int s;

	s = splhi();

	/* set up stacks for various exceptions */
	setr13(PsrMirq, irqstack+nelem(irqstack)-1);
	setr13(PsrMfiq, fiqstack+nelem(fiqstack)-1);
	setr13(PsrMabt, abtstack+nelem(abtstack)-1);
	setr13(PsrMund, undstack+nelem(undstack)-1);

	for(v = 0; v <= V_MAXNUM; v++) {
		Irq[v].r = safeintr;
		Irq[v].a = (void *)v;
	}

	/* Reset Exception */
	offset = ((((ulong) _vsvccall) - 0x0)-8) >> 2;
	op = ( 0xea << 24 ) | offset;
	*((ulong *) 0x0) = op;

	/* Undefined Instruction Exception */
	offset = ((((ulong) _vundcall) - 0x4)-8) >> 2;
	op = ( 0xea << 24 ) | offset;
	*((ulong *) 0x4) = op;

	/* SWI Exception */
	offset = ((((ulong) _vsvccall) - 0x8)-8) >> 2;
	op = ( 0xea << 24 ) | offset;
	*((ulong *) 0x8) = op;

	/* Prefetch Abort Exception */
	offset = ((((ulong) _vpabcall) - 0xc)-8) >> 2;
	op = ( 0xea << 24 ) | offset;
	*((ulong *) 0xc) = op;

	/* Data Abort Exception */
	offset = ((((ulong) _vdabcall) - 0x10)-8) >> 2;
	op = ( 0xea << 24 ) | offset;
	*((ulong *) 0x10) = op;

	/* IRQ Exception */
 	offset = ((((ulong) _virqcall) - 0x18)-8) >> 2;
	op = ( 0xea << 24 ) | offset;
	*((ulong *) 0x18) = op;

	/* FIQ Exception */
 	offset = ((((ulong) _vfiqcall) - 0x1c)-8) >> 2;
	op = ( 0xea << 24 ) | offset;
	*((ulong *) 0x1c) = op;


	flushIcache();
	writeBackDC();
	flushDcache();
	flushIcache();
	drainWBuffer();

	splx(s);
}

/*
 *  trap is called splhi().
 */

void
trap(Ureg* ureg)
{
	ushort mask;
	IrqEntry *ip;

	/*
	 * All interrupts/exceptions should be resumed at ureg->pc-4,
	 * except for Data Abort which resumes at ureg->pc-8.
	 */
	ureg->pc -= 4;

	switch(ureg->type) {
	case PsrMirq:				/* Interrupt Request */
		mask = *(uchar*)HARI1 | ((*(uchar*)HARI2) << 8);
		ip = Irq;
		while (mask != 0) {
			if(mask&1)
				ip->r(ureg, ip->a);
			ip++;
			mask >>= 1;
		}
		break;

	case PsrMfiq:					/* FIQ */
		mask = *(uchar*)HARI1 & HARI1_FIQ_MASK;
		ip = Irq;
		while (mask != 0) {
			if(mask&1)
				ip->r(ureg, ip->a);
			ip++;
			mask >>= 1;
		}
		break;

	case PsrMund:			/* Undefined instruction */
		dumpregs(ureg);
		panic("Undefined Instruction Exception\n");
		break;

	case PsrMsvc:				/* Jump through 0 or SWI  */
		dumpregs(ureg);
		panic("SVC/SWI Exception\n");
		break;

	case PsrMabt:					/* Prefetch abort */
		ureg->pc -= 4;
		/* FALLTHROUGH */

	case PsrMabt+1:	{				/* Data abort */
		uint far =0;
		uint fsr =0;

		USED(far,fsr);
		fsr = 0;	/*mmuregr(CpFSR);*/
		far = 0;	/*mmuregr(CpFAR);	*/
		if (ureg->type == PsrMabt)
			print("Prefetch Abort/");
		print("Data Abort\n");

		print("Data Abort: FSR %8.8uX FAR %8.8uX\n", fsr, far);
		/* FALLTHROUGH */
	}
	default:
		dumpregs(ureg);
		panic("exception %uX\n", ureg->type);
		break;
	}

	splhi();
}

void
dumpregs(Ureg* ureg)
{
	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: %8.8uX\n", ureg);
/*	print("CPSR %8.8uX SPSR %8.8uX\n", cpsrr(), spsrr());*/
}