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Last change on this file since df7f5cea was 208b5f5, checked in by Martin Decky <martin@…>, 12 years ago
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1	#
2	# Copyright (c) 2013 Jakub Klama
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/trap.h>
30	#include <arch/regwin.h>
31
32	.text
33
34	.global trap_table
35	.global reset_trap
36	.global preemptible_trap
37	.global interrupt_trap
38	.global syscall_trap
39	.global window_overflow_trap
40	.global window_underflow_trap
41	.global write_to_invalid
42	.global read_from_invalid
43	.global flush_windows
44
45	.macro get_wim_number reg
46	clr \reg
47	mov %wim, %g5
48
49	1:
50	andcc %g5, 1, %g0
51	bne 2f
52	nop
53	srl %g5, 1, %g5
54	inc \reg
55	b 1b
56
57	2:
58	nop
59	.endm
60
61	.macro get_cwp reg
62	mov %psr, \reg
63	and \reg, 0x7, \reg
64	.endm
65
66	.macro switch_to_invalid saved_wim, saved_psr
67	get_wim_number %l3
68	mov %wim, \saved_wim ! save WIM
69	mov %g0, %wim ! clear WIM
70	mov %psr, \saved_psr ! read PSR
71	and \saved_psr, 0xfffffff0, %l4
72	or %l4, %l3, %l3 ! set CWP
73	mov %l3, %psr ! write PSR
74	nop
75	nop
76	nop
77	nop ! wait for PSR to be effective
78	.endm
79
80	.macro switch_back wim, psr
81	mov \wim, %wim ! saved WIM
82	mov \psr, %psr ! saved PSR
83	nop
84	nop
85	nop
86	nop
87	.endm
88
89	/* Save next window to kernel stack or UWB */
90	.macro inline_save_kernel
91	mov %wim, %l3
92	sll %l3, 7, %l4
93	srl %l3, 1, %l3
94	or %l3, %l4, %l3
95	and %l3, 0xff, %l3
96	mov %g0, %wim
97
98	mov %l5, %g5
99	mov %l6, %g6
100	mov %l7, %g7
101
102	save
103	std %l0, [%sp + 0]
104	std %l2, [%sp + 8]
105	std %l4, [%sp + 16]
106	std %l6, [%sp + 24]
107	std %i0, [%sp + 32]
108	std %i2, [%sp + 40]
109	std %i4, [%sp + 48]
110	std %i6, [%sp + 56]
111	mov %g5, %l5
112	mov %g6, %l6
113	mov %g7, %l7
114	restore
115	mov %l3, %wim
116	.endm
117
118	.macro inline_save_uspace uwb
119	mov %wim, %l3
120	sll %l3, 7, %l4
121	srl %l3, 1, %l3
122	or %l3, %l4, %l3
123	and %l3, 0xff, %l3
124	mov %g0, %wim
125	mov \uwb, %g3
126
127	mov %l5, %g5
128	mov %l6, %g6
129	mov %l7, %g7
130
131	save
132	std %l0, [%g3 + 0]
133	std %l2, [%g3 + 8]
134	std %l4, [%g3 + 16]
135	std %l6, [%g3 + 24]
136	std %i0, [%g3 + 32]
137	std %i2, [%g3 + 40]
138	std %i4, [%g3 + 48]
139	std %i6, [%g3 + 56]
140	mov %g5, %l5
141	mov %g6, %l6
142	mov %g7, %l7
143	add \uwb, 64, \uwb
144	restore
145	mov %l3, %wim
146	.endm
147
148	/* Restore window from kernel stack or UWB */
149	.macro inline_restore_kernel
150	mov %wim, %l3
151	srl %l3, 7, %l4
152	sll %l3, 1, %l3
153	or %l3, %l4, %l3
154	and %l3, 0xff, %l3
155
156	mov %g0, %wim
157	restore
158	mov %l5, %g5
159	mov %l6, %g6
160	mov %l7, %g7
161	restore
162	mov %g5, %l5
163	mov %g6, %l6
164	mov %g7, %l7
165	save
166
167	ldd [%sp + 0], %l0
168	ldd [%sp + 8], %l2
169	ldd [%sp + 16], %l4
170	ldd [%sp + 24], %l6
171	ldd [%sp + 32], %i0
172	ldd [%sp + 40], %i2
173	ldd [%sp + 48], %i4
174	ldd [%sp + 56], %i6
175	save
176
177	mov %l3, %wim
178	.endm
179
180	.macro inline_restore_uspace uwb
181	mov %wim, %l3
182	srl %l3, 7, %l4
183	sll %l3, 1, %l3
184	or %l3, %l4, %l3
185	and %l3, 0xff, %l3
186
187	mov %g0, %wim
188	restore
189	mov %l5, %g5
190	mov %l6, %g6
191	mov %l7, %g7
192	restore
193	mov %g5, %l5
194	mov %g6, %l6
195	mov %g7, %l7
196	save
197
198	sub \uwb, 64, \uwb
199	ldd [\uwb + 0], %l0
200	ldd [\uwb + 8], %l2
201	ldd [\uwb + 16], %l4
202	ldd [\uwb + 24], %l6
203	ldd [\uwb + 32], %i0
204	ldd [\uwb + 40], %i2
205	ldd [\uwb + 48], %i4
206	ldd [\uwb + 56], %i6
207	save
208
209	mov %l3, %wim
210	.endm
211
212	.macro if_from_kernel label
213	mov %psr, %l3
214	and %l3, (1 << 6), %l3
215	cmp %l3, 0
216	bne \label
217	nop
218	.endm
219
220	write_to_invalid:
221	! Write value 1
222	mov %o0, %g7
223	switch_to_invalid %g3, %g4
224	mov %g7, %l5
225	switch_back %g3, %g4
226	! Write value 2
227	mov %o1, %g7
228	switch_to_invalid %g3, %g4
229	mov %g7, %l6
230	switch_back %g3, %g4
231	! Write value 3
232	mov %o2, %g7
233	switch_to_invalid %g3, %g4
234	mov %g7, %l7
235	switch_back %g3, %g4
236	retl
237	nop
238
239	read_from_invalid:
240	! Read value 1
241	mov %o0, %g7
242	switch_to_invalid %g3, %g4
243	st %l5, [%g7]
244	switch_back %g3, %g4
245	! Write value 2
246	mov %o1, %g7
247	switch_to_invalid %g3, %g4
248	st %l6, [%g7]
249	switch_back %g3, %g4
250	! Write value 3
251	mov %o2, %g7
252	switch_to_invalid %g3, %g4
253	st %l7, [%g7]
254	switch_back %g3, %g4
255	retl
256	nop
257
258	reset_trap:
259	set 0x80000100, %l0
260	set 'r', %l1
261	sta %l1, [%l0] 0x1c
262	rett
263
264	window_overflow_trap:
265	mov %g7, %l0
266
267	/* Check whether previous mode was usermode */
268	mov %psr, %l4
269	and %l4, (1 << 6), %l4
270	cmp %l4, 0
271	bne 1f
272	nop
273
274	/* User space: */
275
276	/*
277	* Time to check whether desired stack page is mapped
278	* on the MMU. If so, process with saving window directly.
279	* If not, go to preemptible trap handler.
280	*/
281	mov %wim, %g5
282	mov %g0, %wim
283	save
284	mov %sp, %g4
285	restore
286	mov %g5, %wim
287
288	/* Check beginning of %sp */
289	and %g4, 0xfffff000, %l4
290	lda [%l4] 0x18, %l4
291	cmp %l4, 0
292	bne 1f
293	nop
294
295	/* Prepare args for preemptible handler */
296	mov %g4, %o0
297	set preemptible_save_uspace, %o2
298	b preemptible_trap
299	nop
300
301	/* Check end of %sp */
302	add %g4, 56, %g4
303	and %l4, 0xfffff000, %l4
304	lda [%l4] 0x18, %l4
305	cmp %l4, 0
306	bne 1f
307	nop
308
309	/* Prepare args for preemptible handler */
310	mov %g4, %o0
311	set preemptible_save_uspace, %o2
312	b preemptible_trap
313	nop
314
315	/* Kernel: */
316
317	1:
318	/* Rotate WIM on bit right, we have 8 windows */
319	mov %wim, %l3
320	sll %l3, 7, %l4
321	srl %l3, 1, %l3
322	or %l3, %l4, %l3
323	and %l3, 0xff, %l3
324
325	/* Disable WIM traps */
326	mov %g0,%wim
327	nop; nop; nop
328
329	/* Save invalid window data */
330	mov %l5, %g5 ! kernel stack pointer
331	mov %l6, %g6 ! kernel wbuf
332	mov %l7, %g7
333
334	/*
335	* We should check whether window needs to be saved
336	* to kernel stack or uwb.
337	*/
338	cmp %g7, 0
339	bne 2f
340	nop
341
342	/* Dump registers to stack */
343	save
344	std %l0, [%sp + 0]
345	std %l2, [%sp + 8]
346	std %l4, [%sp + 16]
347	std %l6, [%sp + 24]
348	std %i0, [%sp + 32]
349	std %i2, [%sp + 40]
350	std %i4, [%sp + 48]
351	std %i6, [%sp + 56]
352	b 3f
353	nop
354
355	/* Dump registers to uwb */
356	2:
357	save
358	std %l0, [%g6 + 0]
359	std %l2, [%g6 + 8]
360	std %l4, [%g6 + 16]
361	std %l6, [%g6 + 24]
362	std %i0, [%g6 + 32]
363	std %i2, [%g6 + 40]
364	std %i4, [%g6 + 48]
365	std %i6, [%g6 + 56]
366	add %g6, 64, %g6
367
368	/* Check whether it's the last user window to be saved */
369	and %g7, 0x7, %l5
370	mov %psr, %l4
371	and %l4, 0x7, %l4
372	cmp %l5, %l4
373	bne 3f
374	nop
375
376	/* Clear uspace window mark */
377	clr %g7
378
379	3:
380	/* Back to where we should be */
381	mov %g5, %l5
382	mov %g6, %l6
383	mov %g7, %l7
384	restore
385
386	/* Set new value of window */
387	mov %l3,%wim
388	nop; nop; nop
389
390	/* Go home */
391	mov %l0, %g7
392	jmp %l1
393	rett %l2
394
395	window_underflow_trap:
396	mov %g7, %l0
397
398	/* Check whether previous mode was usermode */
399	mov %psr, %l4
400	and %l4, (1 << 6), %l4
401	cmp %l4, 0
402	bne 1f
403	nop
404
405	/* User space: */
406
407	/*
408	* Time to check whether desired stack page is mapped
409	* on the MMU. If so, process with saving window directly.
410	* If not, go to preemptible trap handler.
411	*/
412	mov %wim, %g5
413	mov %g0, %wim
414	restore
415	restore
416	mov %sp, %g4
417	save
418	save
419	mov %g5, %wim
420	and %sp, 0xfffff000, %l4
421	lda [%l4] 0x18, %l4
422	cmp %l4, 0
423	bne 1f
424	nop
425
426	/* Prepare args for preemptible handler */
427	mov %g4, %o0
428	set preemptible_restore_uspace, %o2
429	b preemptible_trap
430	nop
431
432	1:
433	/* Rotate WIM on bit LEFT, we have 8 windows */
434	mov %wim, %l3
435	srl %l3, 7, %l4
436	sll %l3, 1, %l3
437	or %l3, %l4, %l3
438	and %l3, 0xff, %l3
439
440	/* Disable WIM traps */
441	mov %g0, %wim
442	nop; nop; nop
443
444	/* Kernel: */
445	restore
446	restore
447	mov %l5, %g5 ! kernel stack pointer
448	mov %l6, %g6 ! kernel wbuf
449	mov %l7, %g7
450
451	ldd [%sp + 0], %l0
452	ldd [%sp + 8], %l2
453	ldd [%sp + 16], %l4
454	ldd [%sp + 24], %l6
455	ldd [%sp + 32], %i0
456	ldd [%sp + 40], %i2
457	ldd [%sp + 48], %i4
458	ldd [%sp + 56], %i6
459	b 2f
460	nop
461
462	2:
463	/* Restore invalid window data */
464	restore
465	mov %g5, %l5
466	mov %g6, %l6
467	mov %g7, %l7
468	save
469	save
470	save
471
472	/* Set new value of window */
473	mov %l3, %wim
474	nop; nop; nop
475
476	/* Go home */
477	mov %l0, %g7
478	jmp %l1
479	rett %l2
480
481	flush_windows:
482	mov 7, %g1
483	1:
484	subcc %g1, 1, %g1
485	bg 1b
486	save %sp, -64, %sp
487
488	mov 7, %g1
489	1:
490	subcc %g1, 1, %g1
491	bg 1b
492	restore
493
494	retl
495	nop
496
497	preemptible_trap:
498	/* Save %g7 */
499	mov %g7, %l0
500
501	/* Check whether we landed in invalid window */
502	get_wim_number %g6
503	get_cwp %g7
504	cmp %g6, %g7
505	bne 4f
506	nop
507
508	/* We are in invalid window. Check whether previous mode was usermode. */
509	if_from_kernel 3f
510
511	/* Trap originated from user space */
512	/* Kernel stack pointer is at %l5, uwb is at %l6 */
513	inline_save_uspace %l6
514
515	/* Set uspace window mark */
516	mov %psr, %l7
517	inc %l7
518	and %l7, 0x7, %l7
519	or %l7, 0x10, %l7
520	b 4f
521	nop
522
523	3:
524	/* Trap originated from kernel */
525	inline_save_kernel
526
527	4:
528	/* Check whether previous mode was user mode */
529	if_from_kernel 5f
530
531	/* Load kernel stack pointer from invalid window */
532	switch_to_invalid %g5, %g6
533
534	/* set uspace window mark */
535	mov %g6, %l7
536	inc %l7
537	and %l7, 0x7, %l7
538	or %l7, 0x10, %l7
539
540	/* Save stack pointer */
541	mov %l5, %g7
542	switch_back %g5, %g6
543	mov %g7, %sp
544	## mov %sp, %fp
545
546	5:
547	/* Set up stack frame */
548	sub %sp, 128, %sp
549
550	/* Save trap data on stack */
551	mov %psr, %l5
552	st %l1, [%sp + 92]
553	st %l2, [%sp + 96]
554	st %l5, [%sp + 100]
555	st %g1, [%sp + 104]
556	st %g2, [%sp + 108]
557	st %g3, [%sp + 112]
558	st %g4, [%sp + 116]
559	st %l0, [%sp + 120]
560
561	/* Enable traps */
562	mov %psr, %l0
563	or %l0, (1 << 5), %l0
564	or %l0, 0xf00, %l0
565	mov %l0, %psr
566	nop
567	nop
568	nop
569	nop
570
571	/* Flush windows to stack */
572	call flush_windows
573	nop
574
575	/* Jump to actual subroutine */
576	call %o2
577	add %sp, 128, %o1
578
579	/* Return from handler (leave PIL disabled) */
580	ld [%sp + 92], %l1
581	ld [%sp + 96], %l2
582	ld [%sp + 100], %l0
583	or %l0, 0xf00, %l0
584	mov %l0, %psr
585	nop
586	nop
587	nop
588	nop
589	nop
590
591	/*
592	* If trap originated from user space, clear user space window mark
593	* and save uwb address for future use.
594	*/
595	if_from_kernel 9f
596	switch_to_invalid %g5, %g6
597	clr %l7
598	mov %l5, %g2
599	mov %l6, %g7
600	switch_back %g5, %g6
601	mov %g7, %g1
602
603	/* If trap originated from user space, restore all windows from UWB */
604	/* UWB pointer is at %g1 */
605	0:
606	mov %g0, %wim
607	clr %g5
608	andcc %g1, UWB_ALIGNMENT - 1, %g0
609	bz 0f
610	nop
611
612	restore
613	sub %g1, 64, %g1
614	ldd [%g1 + 0], %l0
615	ldd [%g1 + 8], %l2
616	ldd [%g1 + 16], %l4
617	ldd [%g1 + 24], %l6
618	ldd [%g1 + 32], %i0
619	ldd [%g1 + 40], %i2
620	ldd [%g1 + 48], %i4
621	ldd [%g1 + 56], %i6
622	inc %g5
623	and %g5, 0x7, %g5
624	ba 0b
625	nop
626
627	/*
628	* We've restored all uspace windows. Now time to
629	* fix CWP and WIM.
630	*/
631	0:
632	restore
633	get_cwp %g7
634	clr %g5
635	inc %g5
636	sll %g5, %g7, %g5
637
638	/* Write values to invalid window and switch back */
639	mov %g2, %l5
640	mov %g1, %l6
641	clr %l7
642	switch_back %g5, %g6
643
644	mov %sp, %l3
645	sub %g2, 128, %sp
646	ld [%sp + 104], %g1
647	ld [%sp + 108], %g2
648	ld [%sp + 112], %g3
649	ld [%sp + 116], %g4
650	ld [%sp + 120], %g7
651
652	mov %l3, %sp
653	b 10f
654	nop
655
656	9:
657	inline_restore_kernel
658
659	ld [%sp + 104], %g1
660	ld [%sp + 108], %g2
661	ld [%sp + 112], %g3
662	ld [%sp + 116], %g4
663	ld [%sp + 120], %g7
664
665	/* Restore old sp */
666	add %sp, 128, %sp
667
668	10:
669	jmp %l1
670	rett %l2
671
672	interrupt_trap:
673	/* Save %g7 */
674	mov %g7, %l0
675
676	/* Check whether we landed in invalid window */
677	get_wim_number %g6
678	get_cwp %g7
679	cmp %g6, %g7
680	bne 4f
681	nop
682
683	/* We are in invalid window. Check whether previous mode was user mode */
684	if_from_kernel 3f
685
686	/* Trap originated from user space */
687	/* Kernel stack pointer is at %l5, uwb is at %l6 */
688	inline_save_uspace %l6
689
690	/* Set uspace window mark */
691	mov %psr, %l7
692	inc %l7
693	and %l7, 0x7, %l7
694	or %l7, 0x10, %l7
695	b 4f
696	nop
697
698	3:
699	/* Trap originated from kernel */
700	inline_save_kernel
701
702	4:
703	/* Check whether previous mode was user mode */
704	if_from_kernel 5f
705
706	/* Load kernel stack pointer from invalid window */
707	switch_to_invalid %g5, %g6
708
709	/* Set user space window mark */
710	mov %g6, %l7
711	inc %l7
712	and %l7, 0x7, %l7
713	or %l7, 0x10, %l7
714
715	/* Save stack pointer */
716	mov %l5, %g7
717	switch_back %g5, %g6
718	mov %g7, %sp
719
720	5:
721	/* Set up stack frame */
722	sub %sp, 128, %sp
723
724	/* Save trap data on stack */
725	mov %psr, %l5
726	st %l1, [%sp + 92]
727	st %l2, [%sp + 96]
728	st %l5, [%sp + 100]
729	st %g1, [%sp + 104]
730	st %g2, [%sp + 108]
731	st %g3, [%sp + 112]
732	st %g4, [%sp + 116]
733	st %l0, [%sp + 120]
734
735	/* Enable traps (without PIL) */
736	mov %psr, %l0
737	or %l0, (1 << 5), %l0
738	or %l0, 0xf00, %l0
739	mov %l0, %psr
740	nop
741	nop
742	nop
743	nop
744
745	/* Flush windows to stack */
746	call flush_windows
747	nop
748
749	/* Jump to actual subroutine */
750	call irq_exception
751	add %sp, 128, %o1
752
753	/* Return from handler (leave PIL disabled) */
754	ld [%sp + 92], %l1
755	ld [%sp + 96], %l2
756	ld [%sp + 100], %l0
757	or %l0, 0xf00, %l0
758	mov %l0, %psr
759	nop
760	nop
761	nop
762	nop
763	nop
764
765	/*
766	* If trap originated from user space, clear user space window mark
767	* and save uwb address for future use.
768	*/
769	if_from_kernel 9f
770	switch_to_invalid %g5, %g6
771	clr %l7
772	mov %l5, %g2
773	mov %l6, %g7
774	switch_back %g5, %g6
775	mov %g7, %g1
776
777	/* If trap originated from user space, restore all windows from UWB */
778	/* UWB pointer is at %g1 */
779	0:
780	mov %g0, %wim
781	clr %g5
782	andcc %g1, UWB_ALIGNMENT - 1, %g0
783	bz 0f
784	nop
785
786	restore
787	sub %g1, 64, %g1
788	ldd [%g1 + 0], %l0
789	ldd [%g1 + 8], %l2
790	ldd [%g1 + 16], %l4
791	ldd [%g1 + 24], %l6
792	ldd [%g1 + 32], %i0
793	ldd [%g1 + 40], %i2
794	ldd [%g1 + 48], %i4
795	ldd [%g1 + 56], %i6
796	inc %g5
797	and %g5, 0x7, %g5
798	ba 0b
799	nop
800
801	/*
802	* We've restored all user space windows. Now time to
803	* fix CWP and WIM.
804	*/
805	0:
806	restore
807	get_cwp %g7
808	clr %g5
809	inc %g5
810	sll %g5, %g7, %g5
811
812	/* Write values to invalid window and switch back */
813	mov %g2, %l5
814	mov %g1, %l6
815	clr %l7
816	switch_back %g5, %g6
817
818	mov %sp, %l3
819	sub %g2, 128, %sp
820	ld [%sp + 104], %g1
821	ld [%sp + 108], %g2
822	ld [%sp + 112], %g3
823	ld [%sp + 116], %g4
824	ld [%sp + 120], %g7
825
826	mov %l3, %sp
827	b 10f
828	nop
829
830	9:
831	inline_restore_kernel
832
833	ld [%sp + 104], %g1
834	ld [%sp + 108], %g2
835	ld [%sp + 112], %g3
836	ld [%sp + 116], %g4
837	ld [%sp + 120], %g7
838
839	/* Restore old sp */
840	add %sp, 128, %sp
841
842	10:
843	jmp %l1
844	rett %l2
845
846	syscall_trap:
847	/* Save %g7 */
848	mov %g7, %l0
849
850	/* Check whether we landed in invalid window */
851	get_wim_number %g6
852	get_cwp %g7
853	cmp %g6, %g7
854	bne 4f
855	nop
856
857	/* We are in invalid window. Check whether previous mode was user mode */
858	if_from_kernel 3f
859
860	/* Trap originated from user space */
861	/* Kernel stack pointer is at %l5, uwb is at %l6 */
862	inline_save_uspace %l6
863
864	/* Set user space window mark */
865	mov %psr, %l7
866	inc %l7
867	and %l7, 0x7, %l7
868	or %l7, 0x10, %l7
869	b 4f
870	nop
871
872	3:
873	/* Trap originated from kernel */
874	inline_save_kernel
875
876	4:
877	/* Check whether previous mode was user mode */
878	if_from_kernel 5f
879
880	/* Load kernel stack pointer from invalid window */
881	switch_to_invalid %g5, %g6
882
883	/* Set user space window mark */
884	mov %g6, %l7
885	inc %l7
886	and %l7, 0x7, %l7
887	or %l7, 0x10, %l7
888
889	/* Save stack pointer */
890	mov %l5, %g7
891	switch_back %g5, %g6
892	mov %g7, %sp
893	## mov %sp, %fp
894
895	5:
896	/* Set up stack frame */
897	sub %sp, 128, %sp
898
899	/* Save trap data on stack */
900	mov %psr, %l5
901	st %l1, [%sp + 92]
902	st %l2, [%sp + 96]
903	st %l5, [%sp + 100]
904	st %g1, [%sp + 104]
905	st %g2, [%sp + 108]
906	st %g3, [%sp + 112]
907	st %g4, [%sp + 116]
908	st %l0, [%sp + 120]
909
910	/* Enable traps (without PIL) */
911	mov %psr, %l0
912	or %l0, (1 << 5), %l0
913	or %l0, 0xf00, %l0
914	mov %l0, %psr
915	nop
916	nop
917	nop
918	nop
919
920	/* Flush windows */
921	call flush_windows
922	nop
923
924	/* Jump to actual subroutine */
925	sub %o0, 0x80, %o0
926	st %o0, [%sp + 92]
927	mov %i0, %o0
928	mov %i1, %o1
929	mov %i2, %o2
930	mov %i3, %o3
931	mov %i4, %o4
932	call syscall
933	mov %i5, %o5
934
935	/* Return from handler (with PIL disabled) */
936	ld [%sp + 92], %l1
937	ld [%sp + 96], %l2
938	ld [%sp + 100], %l0
939	mov %o0, %i0
940	mov %psr, %l1
941	and %l1, 0xf, %l1
942	or %l1, 0x00000f00, %l1
943	and %l0, 0xfffffff0, %l0
944	or %l0, %l1, %l0
945	mov %l0, %psr
946	nop
947	nop
948	nop
949	nop
950	nop
951
952	/*
953	* If trap originated from user space, clear user space window mark
954	* and save uwb address for future use.
955	*/
956	if_from_kernel 8f
957	switch_to_invalid %g5, %g6
958	mov %l5, %g2
959	mov %l6, %g1
960	mov %l7, %g7
961	switch_back %g5, %g6
962
963	/* If trap originated from user space, restore all windows from UWB */
964	/* UWB pointer is at %g1 */
965	0:
966	mov %g0, %wim
967	clr %g5
968	andcc %g1, UWB_ALIGNMENT - 1, %g0
969	bz 0f
970	nop
971
972	restore
973	sub %g1, 64, %g1
974	ldd [%g1 + 0], %l0
975	ldd [%g1 + 8], %l2
976	ldd [%g1 + 16], %l4
977	ldd [%g1 + 24], %l6
978	ldd [%g1 + 32], %i0
979	ldd [%g1 + 40], %i2
980	ldd [%g1 + 48], %i4
981	ldd [%g1 + 56], %i6
982	inc %g5
983	and %g5, 0x7, %g5
984	ba 0b
985	nop
986
987	/*
988	* We've restored all user space windows. Now time to
989	* fix CWP and WIM.
990	*/
991	0:
992	restore
993	get_cwp %g7
994	clr %g5
995	inc %g5
996	sll %g5, %g7, %g5
997
998	/* Write values to invalid window and switch back */
999	mov %g2, %l5
1000	mov %g1, %l6
1001	clr %l7
1002	switch_back %g5, %g6
1003
1004	8:
1005	mov %sp, %l1
1006	sub %g2, 128, %sp
1007	ld [%sp + 104], %g1
1008	ld [%sp + 108], %g2
1009	ld [%sp + 112], %g3
1010	ld [%sp + 116], %g4
1011	ld [%sp + 120], %g7
1012
1013	mov %l1, %sp
1014	nop
1015	nop
1016	nop
1017
1018	jmp %l2
1019	rett %l2 + 4
1020
1021	#define STRAP(_vector, _handler) \
1022	.org trap_table + _vector * TRAP_ENTRY_SIZE; \
1023	mov %psr, %l0 ; \
1024	sethi %hi(_handler), %l4 ; \
1025	jmp %lo(_handler) + %l4 ; \
1026	nop
1027
1028	#define TRAP(_vector, _handler) \
1029	.org trap_table + _vector * TRAP_ENTRY_SIZE; \
1030	set _vector, %o0 ; \
1031	sethi %hi(_handler), %o2 ; \
1032	b preemptible_trap ; \
1033	or %o2, %lo(_handler), %o2 ;
1034
1035	#define SYSCALL(_vector) \
1036	.org trap_table + _vector * TRAP_ENTRY_SIZE; \
1037	set _vector, %o0 ; \
1038	b syscall_trap ; \
1039	nop ;
1040
1041	#define INTERRUPT(_vector, _priority) \
1042	.org trap_table + _vector * TRAP_ENTRY_SIZE; \
1043	mov _priority, %o0 ; \
1044	b interrupt_trap ; \
1045	nop ;
1046	nop ;
1047
1048	#define BADTRAP(_vector) \
1049	.org trap_table + _vector * TRAP_ENTRY_SIZE ; \
1050	ta 0 ;
1051
1052	.align TRAP_TABLE_SIZE
1053	trap_table:
1054	STRAP(0x0, reset_trap)
1055	TRAP(0x1, instruction_access_exception)
1056	TRAP(0x2, illegal_instruction)
1057	TRAP(0x3, privileged_instruction)
1058	TRAP(0x4, fp_disabled)
1059	STRAP(0x5, window_overflow_trap)
1060	STRAP(0x6, window_underflow_trap)
1061	TRAP(0x7, mem_address_not_aligned)
1062	TRAP(0x8, fp_exception)
1063	TRAP(0x9, data_access_exception)
1064	TRAP(0xa, tag_overflow)
1065	BADTRAP(0xb)
1066	BADTRAP(0xc)
1067	BADTRAP(0xd)
1068	BADTRAP(0xe)
1069	BADTRAP(0xf)
1070	BADTRAP(0x10)
1071	INTERRUPT(0x11, 1)
1072	INTERRUPT(0x12, 2)
1073	INTERRUPT(0x13, 3)
1074	INTERRUPT(0x14, 4)
1075	INTERRUPT(0x15, 5)
1076	INTERRUPT(0x16, 6)
1077	INTERRUPT(0x17, 7)
1078	INTERRUPT(0x18, 8)
1079	INTERRUPT(0x19, 9)
1080	INTERRUPT(0x1a, 10)
1081	INTERRUPT(0x1b, 11)
1082	INTERRUPT(0x1c, 12)
1083	INTERRUPT(0x1d, 13)
1084	INTERRUPT(0x1e, 14)
1085	INTERRUPT(0x1f, 15)
1086	TRAP(0x21, instruction_access_error)
1087	BADTRAP(0x22)
1088	BADTRAP(0x23)
1089	BADTRAP(0x24)
1090	BADTRAP(0x25)
1091	BADTRAP(0x26)
1092	BADTRAP(0x27)
1093	BADTRAP(0x28)
1094	TRAP(0x29, data_access_error)
1095	TRAP(0x2a, division_by_zero)
1096	TRAP(0x2b, data_store_error)
1097	TRAP(0x2c, data_access_mmu_miss)
1098	BADTRAP(0x2d)
1099	BADTRAP(0x2e)
1100	BADTRAP(0x2f)
1101	BADTRAP(0x30)
1102	BADTRAP(0x31)
1103	BADTRAP(0x32)
1104	BADTRAP(0x33)
1105	BADTRAP(0x34)
1106	BADTRAP(0x35)
1107	BADTRAP(0x36)
1108	BADTRAP(0x37)
1109	BADTRAP(0x38)
1110	BADTRAP(0x39)
1111	BADTRAP(0x3a)
1112	BADTRAP(0x3b)
1113	BADTRAP(0x3c)
1114	BADTRAP(0x3d)
1115	BADTRAP(0x3e)
1116	BADTRAP(0x3f)
1117	BADTRAP(0x40)
1118	BADTRAP(0x41)
1119	BADTRAP(0x42)
1120	BADTRAP(0x43)
1121	BADTRAP(0x44)
1122	BADTRAP(0x45)
1123	BADTRAP(0x46)
1124	BADTRAP(0x47)
1125	BADTRAP(0x48)
1126	BADTRAP(0x49)
1127	BADTRAP(0x4a)
1128	BADTRAP(0x4b)
1129	BADTRAP(0x4c)
1130	BADTRAP(0x4d)
1131	BADTRAP(0x4e)
1132	BADTRAP(0x4f)
1133	BADTRAP(0x50)
1134	BADTRAP(0x51)
1135	BADTRAP(0x52)
1136	BADTRAP(0x53)
1137	BADTRAP(0x54)
1138	BADTRAP(0x55)
1139	BADTRAP(0x56)
1140	BADTRAP(0x57)
1141	BADTRAP(0x58)
1142	BADTRAP(0x59)
1143	BADTRAP(0x5a)
1144	BADTRAP(0x5b)
1145	BADTRAP(0x5c)
1146	BADTRAP(0x5d)
1147	BADTRAP(0x5e)
1148	BADTRAP(0x5f)
1149	BADTRAP(0x60)
1150	BADTRAP(0x61)
1151	BADTRAP(0x62)
1152	BADTRAP(0x63)
1153	BADTRAP(0x64)
1154	BADTRAP(0x65)
1155	BADTRAP(0x66)
1156	BADTRAP(0x67)
1157	BADTRAP(0x68)
1158	BADTRAP(0x69)
1159	BADTRAP(0x6a)
1160	BADTRAP(0x6b)
1161	BADTRAP(0x6c)
1162	BADTRAP(0x6d)
1163	BADTRAP(0x6e)
1164	BADTRAP(0x6f)
1165	BADTRAP(0x70)
1166	BADTRAP(0x71)
1167	BADTRAP(0x72)
1168	BADTRAP(0x73)
1169	BADTRAP(0x74)
1170	BADTRAP(0x75)
1171	BADTRAP(0x76)
1172	BADTRAP(0x77)
1173	BADTRAP(0x78)
1174	BADTRAP(0x79)
1175	BADTRAP(0x7a)
1176	BADTRAP(0x7b)
1177	BADTRAP(0x7c)
1178	BADTRAP(0x7d)
1179	BADTRAP(0x7e)
1180	BADTRAP(0x7f)
1181	SYSCALL(0x80)
1182	SYSCALL(0x81)
1183	SYSCALL(0x82)
1184	SYSCALL(0x83)
1185	SYSCALL(0x84)
1186	SYSCALL(0x85)
1187	SYSCALL(0x86)
1188	SYSCALL(0x87)
1189	SYSCALL(0x88)
1190	SYSCALL(0x89)
1191	SYSCALL(0x8a)
1192	SYSCALL(0x8b)
1193	SYSCALL(0x8c)
1194	SYSCALL(0x8d)
1195	SYSCALL(0x8e)
1196	SYSCALL(0x8f)
1197	SYSCALL(0x90)
1198	SYSCALL(0x91)
1199	SYSCALL(0x92)
1200	SYSCALL(0x93)
1201	SYSCALL(0x94)
1202	SYSCALL(0x95)
1203	SYSCALL(0x96)
1204	SYSCALL(0x97)
1205	SYSCALL(0x98)
1206	SYSCALL(0x99)
1207	SYSCALL(0x9a)
1208	SYSCALL(0x9b)
1209	SYSCALL(0x9c)
1210	SYSCALL(0x9d)
1211	SYSCALL(0x9e)
1212	SYSCALL(0x9f)
1213	SYSCALL(0xa0)
1214	SYSCALL(0xa1)
1215	SYSCALL(0xa2)
1216	SYSCALL(0xa3)
1217	SYSCALL(0xa4)
1218	SYSCALL(0xa5)
1219	SYSCALL(0xa6)
1220	SYSCALL(0xa7)
1221	SYSCALL(0xa8)
1222	SYSCALL(0xa9)
1223	SYSCALL(0xaa)
1224	SYSCALL(0xab)
1225	SYSCALL(0xac)
1226	SYSCALL(0xad)
1227	SYSCALL(0xae)
1228	SYSCALL(0xaf)
1229	SYSCALL(0xb0)
1230	SYSCALL(0xb1)
1231	SYSCALL(0xb2)
1232	SYSCALL(0xb3)
1233	SYSCALL(0xb4)
1234	SYSCALL(0xb5)
1235	SYSCALL(0xb6)
1236	SYSCALL(0xb7)
1237	SYSCALL(0xb8)
1238	SYSCALL(0xb9)
1239	SYSCALL(0xba)
1240	SYSCALL(0xbb)
1241	SYSCALL(0xbc)
1242	SYSCALL(0xbd)
1243	SYSCALL(0xbe)
1244	SYSCALL(0xbf)
1245	SYSCALL(0xc0)
1246	SYSCALL(0xc1)
1247	SYSCALL(0xc2)
1248	SYSCALL(0xc3)
1249	SYSCALL(0xc4)
1250	SYSCALL(0xc5)
1251	SYSCALL(0xc6)
1252	SYSCALL(0xc7)
1253	SYSCALL(0xc8)
1254	SYSCALL(0xc9)
1255	SYSCALL(0xca)
1256	SYSCALL(0xcb)
1257	SYSCALL(0xcc)
1258	SYSCALL(0xcd)
1259	SYSCALL(0xce)
1260	SYSCALL(0xcf)

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