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>
1	jermar	36
317	palkovsky	37	void exception(struct exception_regdump *pstate)
1	jermar	38	{
330	palkovsky	39	int cause;
1	jermar	40	int excno;
123	decky	41	__u32 epc_shift = 0;
213	jermar	42
227	jermar	43	ASSERT(CPU != NULL);
		44
213	jermar	45	/*
		46	* NOTE ON OPERATION ORDERING
		47	*
317	palkovsky	48	* On entry, cpu_priority_high() must be called before
		49	* exception bit is cleared.
213	jermar	50	*/
		51
313	palkovsky	52	cpu_priority_high();
		53	cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit \|
		54	cp0_status_um_bit));
327	palkovsky	55
326	palkovsky	56	/* Save pstate so that the threads can access it */
327	palkovsky	57	/* If THREAD->pstate is set, this is nested exception,
		58	* do not rewrite it
		59	*/
		60	if (THREAD && !THREAD->pstate)
326	palkovsky	61	THREAD->pstate = pstate;
1	jermar	62
330	palkovsky	63	cause = cp0_cause_read();
		64	excno = cp0_cause_excno(cause);
1	jermar	65	/* decode exception number and process the exception */
330	palkovsky	66	switch (excno) {
123	decky	67	case EXC_Int:
332	palkovsky	68	interrupt(pstate);
123	decky	69	break;
1	jermar	70	case EXC_TLBL:
123	decky	71	case EXC_TLBS:
317	palkovsky	72	tlb_invalid(pstate);
123	decky	73	break;
327	palkovsky	74	case EXC_CpU:
		75	#ifdef FPU_LAZY
330	palkovsky	76	if (cp0_cause_coperr(cause) == fpu_cop_id)
		77	scheduler_fpu_lazy_request();
		78	else
327	palkovsky	79	#endif
330	palkovsky	80	panic("unhandled Coprocessor Unusable Exception\n");
327	palkovsky	81	break;
123	decky	82	case EXC_Mod:
		83	panic("unhandled TLB Modification Exception\n");
		84	break;
		85	case EXC_AdEL:
		86	panic("unhandled Address Error Exception - load or instruction fetch\n");
		87	break;
		88	case EXC_AdES:
		89	panic("unhandled Address Error Exception - store\n");
		90	break;
		91	case EXC_IBE:
		92	panic("unhandled Bus Error Exception - fetch instruction\n");
		93	break;
		94	case EXC_DBE:
		95	panic("unhandled Bus Error Exception - data reference: load or store\n");
		96	break;
		97	case EXC_Bp:
		98	/* it is necessary to not re-execute BREAK instruction after returning from Exception handler
		99	(see page 138 in R4000 Manual for more information) */
		100	epc_shift = 4;
		101	break;
		102	case EXC_RI:
		103	panic("unhandled Reserved Instruction Exception\n");
		104	break;
		105	case EXC_Ov:
		106	panic("unhandled Arithmetic Overflow Exception\n");
		107	break;
		108	case EXC_Tr:
		109	panic("unhandled Trap Exception\n");
		110	break;
		111	case EXC_VCEI:
		112	panic("unhandled Virtual Coherency Exception - instruction\n");
		113	break;
		114	case EXC_FPE:
		115	panic("unhandled Floating-Point Exception\n");
		116	break;
		117	case EXC_WATCH:
		118	panic("unhandled reference to WatchHi/WatchLo address\n");
		119	break;
		120	case EXC_VCED:
		121	panic("unhandled Virtual Coherency Exception - data\n");
		122	break;
		123	default:
		124	panic("unhandled exception %d\n", excno);
1	jermar	125	}
		126
317	palkovsky	127	pstate->epc += epc_shift;
327	palkovsky	128	/* Set to NULL, so that we can still support nested
		129	* exceptions
		130	* TODO: We should probably set EXL bit before this command,
		131	* nesting. On the other hand, if some exception occurs between
		132	* here and ERET, it won't set anything on the pstate anyway.
		133	*/
326	palkovsky	134	if (THREAD)
		135	THREAD->pstate = NULL;
1	jermar	136	}

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