WebSVN – HelenOS-historic – Blame – /kernel/trunk/arch/mips32/src/exception.c

Rev	Author	Line No.	Line
1	jermar	1	/*
319	jermar	2	* Copyright (C) 2003-2004 Jakub Jermar
1	jermar	3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	#include <arch/exception.h>
195	vana	30	#include <arch/interrupt.h>
1	jermar	31	#include <panic.h>
		32	#include <arch/cp0.h>
		33	#include <arch/types.h>
		34	#include <arch.h>
227	jermar	35	#include <debug.h>
391	jermar	36	#include <proc/thread.h>
1	jermar	37
317	palkovsky	38	void exception(struct exception_regdump *pstate)
1	jermar	39	{
330	palkovsky	40	int cause;
1	jermar	41	int excno;
123	decky	42	__u32 epc_shift = 0;
213	jermar	43
227	jermar	44	ASSERT(CPU != NULL);
		45
213	jermar	46	/*
		47	* NOTE ON OPERATION ORDERING
		48	*
317	palkovsky	49	* On entry, cpu_priority_high() must be called before
		50	* exception bit is cleared.
213	jermar	51	*/
		52
313	palkovsky	53	cpu_priority_high();
		54	cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit \|
		55	cp0_status_um_bit));
327	palkovsky	56
326	palkovsky	57	/* Save pstate so that the threads can access it */
327	palkovsky	58	/* If THREAD->pstate is set, this is nested exception,
		59	* do not rewrite it
		60	*/
		61	if (THREAD && !THREAD->pstate)
326	palkovsky	62	THREAD->pstate = pstate;
1	jermar	63
330	palkovsky	64	cause = cp0_cause_read();
		65	excno = cp0_cause_excno(cause);
1	jermar	66	/* decode exception number and process the exception */
330	palkovsky	67	switch (excno) {
123	decky	68	case EXC_Int:
332	palkovsky	69	interrupt(pstate);
123	decky	70	break;
1	jermar	71	case EXC_TLBL:
123	decky	72	case EXC_TLBS:
317	palkovsky	73	tlb_invalid(pstate);
123	decky	74	break;
327	palkovsky	75	case EXC_CpU:
		76	#ifdef FPU_LAZY
330	palkovsky	77	if (cp0_cause_coperr(cause) == fpu_cop_id)
		78	scheduler_fpu_lazy_request();
		79	else
327	palkovsky	80	#endif
330	palkovsky	81	panic("unhandled Coprocessor Unusable Exception\n");
327	palkovsky	82	break;
123	decky	83	case EXC_Mod:
389	jermar	84	tlb_modified(pstate);
123	decky	85	break;
		86	case EXC_AdEL:
		87	panic("unhandled Address Error Exception - load or instruction fetch\n");
		88	break;
		89	case EXC_AdES:
		90	panic("unhandled Address Error Exception - store\n");
		91	break;
		92	case EXC_IBE:
		93	panic("unhandled Bus Error Exception - fetch instruction\n");
		94	break;
		95	case EXC_DBE:
		96	panic("unhandled Bus Error Exception - data reference: load or store\n");
		97	break;
		98	case EXC_Bp:
		99	/* it is necessary to not re-execute BREAK instruction after returning from Exception handler
		100	(see page 138 in R4000 Manual for more information) */
		101	epc_shift = 4;
		102	break;
		103	case EXC_RI:
		104	panic("unhandled Reserved Instruction Exception\n");
		105	break;
		106	case EXC_Ov:
		107	panic("unhandled Arithmetic Overflow Exception\n");
		108	break;
		109	case EXC_Tr:
		110	panic("unhandled Trap Exception\n");
		111	break;
		112	case EXC_VCEI:
		113	panic("unhandled Virtual Coherency Exception - instruction\n");
		114	break;
		115	case EXC_FPE:
		116	panic("unhandled Floating-Point Exception\n");
		117	break;
		118	case EXC_WATCH:
		119	panic("unhandled reference to WatchHi/WatchLo address\n");
		120	break;
		121	case EXC_VCED:
		122	panic("unhandled Virtual Coherency Exception - data\n");
		123	break;
		124	default:
		125	panic("unhandled exception %d\n", excno);
1	jermar	126	}
		127
317	palkovsky	128	pstate->epc += epc_shift;
327	palkovsky	129	/* Set to NULL, so that we can still support nested
		130	* exceptions
		131	* TODO: We should probably set EXL bit before this command,
		132	* nesting. On the other hand, if some exception occurs between
		133	* here and ERET, it won't set anything on the pstate anyway.
		134	*/
326	palkovsky	135	if (THREAD)
		136	THREAD->pstate = NULL;
1	jermar	137	}

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