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529 jermar 1
#
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# Copyright (C) 2005 Jakub Jermar
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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/**
634 jermar 30
 * This file contains two trap tables.
31
 * First, trap_table, is the one wich contains handlers implemented by
32
 * kernel. During initialization, these handlers are copied out to
33
 * the second trap table, trap_table_save, and the first table is
34
 * overwritten with copy of OFW's own trap table. The copy is then patched
35
 * from the trap_table_save.
36
 *
37
 * This arrangement is beneficial because kernel handlers stay on their
38
 * link-time addresses which is good for debugging.
529 jermar 39
 */
666 jermar 40
 
41
.register %g2, #scratch
42
.register %g3, #scratch
43
.register %g6, #scratch
44
.register %g7, #scratch 
45
 
529 jermar 46
.text
47
 
630 jermar 48
#include <arch/trap/trap_table.h>
49
#include <arch/trap/regwin.h>
663 jermar 50
#include <arch/trap/interrupt.h>
667 jermar 51
#include <arch/trap/exception.h>
863 jermar 52
#include <arch/trap/mmu.h>
667 jermar 53
#include <arch/stack.h>
529 jermar 54
 
55
#define TABLE_SIZE	TRAP_TABLE_SIZE
56
#define ENTRY_SIZE	TRAP_TABLE_ENTRY_SIZE
57
 
58
/*
634 jermar 59
 * Kernel trap table.
529 jermar 60
 */
61
.align TABLE_SIZE
62
.global trap_table
63
trap_table:
64
 
667 jermar 65
/* TT = 0x08, TL = 0, instruction_access_exception */
66
.org trap_table + TT_INSTRUCTION_ACCESS_EXCEPTION*ENTRY_SIZE
67
.global instruction_access_exception
68
instruction_access_exception:
69
	SIMPLE_HANDLER do_instruction_access_exc
70
 
663 jermar 71
/* TT = 0x24, TL = 0, clean_window handler */
634 jermar 72
.org trap_table + TT_CLEAN_WINDOW*ENTRY_SIZE
630 jermar 73
.global clean_window_handler
74
clean_window_handler:
75
	CLEAN_WINDOW_HANDLER
529 jermar 76
 
667 jermar 77
/* TT = 0x34, TL = 0, mem_address_not_aligned */
78
.org trap_table + TT_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE
79
.global mem_address_not_aligned
80
mem_address_not_aligned:
81
	SIMPLE_HANDLER do_mem_address_not_aligned
82
 
664 jermar 83
/* TT = 0x41, TL = 0, interrupt_level_1 handler */
84
.org trap_table + TT_INTERRUPT_LEVEL_1*ENTRY_SIZE
85
.global interrupt_level_1_handler
86
interrupt_level_1_handler:
87
	INTERRUPT_LEVEL_N_HANDLER 1
88
 
89
/* TT = 0x42, TL = 0, interrupt_level_2 handler */
90
.org trap_table + TT_INTERRUPT_LEVEL_2*ENTRY_SIZE
91
.global interrupt_level_2_handler
92
interrupt_level_2_handler:
93
	INTERRUPT_LEVEL_N_HANDLER 2
94
 
95
/* TT = 0x43, TL = 0, interrupt_level_3 handler */
96
.org trap_table + TT_INTERRUPT_LEVEL_3*ENTRY_SIZE
97
.global interrupt_level_3_handler
98
interrupt_level_3_handler:
99
	INTERRUPT_LEVEL_N_HANDLER 3
100
 
101
/* TT = 0x44, TL = 0, interrupt_level_4 handler */
102
.org trap_table + TT_INTERRUPT_LEVEL_4*ENTRY_SIZE
103
.global interrupt_level_4_handler
104
interrupt_level_4_handler:
105
	INTERRUPT_LEVEL_N_HANDLER 4
106
 
107
/* TT = 0x45, TL = 0, interrupt_level_5 handler */
108
.org trap_table + TT_INTERRUPT_LEVEL_5*ENTRY_SIZE
109
.global interrupt_level_5_handler
110
interrupt_level_5_handler:
111
	INTERRUPT_LEVEL_N_HANDLER 5
112
 
113
/* TT = 0x46, TL = 0, interrupt_level_6 handler */
114
.org trap_table + TT_INTERRUPT_LEVEL_6*ENTRY_SIZE
115
.global interrupt_level_6_handler
116
interrupt_level_6_handler:
117
	INTERRUPT_LEVEL_N_HANDLER 6
118
 
119
/* TT = 0x47, TL = 0, interrupt_level_7 handler */
120
.org trap_table + TT_INTERRUPT_LEVEL_7*ENTRY_SIZE
121
.global interrupt_level_7_handler
122
interrupt_level_7_handler:
123
	INTERRUPT_LEVEL_N_HANDLER 7
124
 
125
/* TT = 0x48, TL = 0, interrupt_level_8 handler */
126
.org trap_table + TT_INTERRUPT_LEVEL_8*ENTRY_SIZE
127
.global interrupt_level_8_handler
128
interrupt_level_8_handler:
129
	INTERRUPT_LEVEL_N_HANDLER 8
130
 
131
/* TT = 0x49, TL = 0, interrupt_level_9 handler */
132
.org trap_table + TT_INTERRUPT_LEVEL_9*ENTRY_SIZE
133
.global interrupt_level_9_handler
134
interrupt_level_9_handler:
135
	INTERRUPT_LEVEL_N_HANDLER 9
136
 
137
/* TT = 0x4a, TL = 0, interrupt_level_10 handler */
138
.org trap_table + TT_INTERRUPT_LEVEL_10*ENTRY_SIZE
139
.global interrupt_level_10_handler
140
interrupt_level_10_handler:
141
	INTERRUPT_LEVEL_N_HANDLER 10
142
 
143
/* TT = 0x4b, TL = 0, interrupt_level_11 handler */
144
.org trap_table + TT_INTERRUPT_LEVEL_11*ENTRY_SIZE
145
.global interrupt_level_11_handler
146
interrupt_level_11_handler:
147
	INTERRUPT_LEVEL_N_HANDLER 11
148
 
149
/* TT = 0x4c, TL = 0, interrupt_level_12 handler */
150
.org trap_table + TT_INTERRUPT_LEVEL_12*ENTRY_SIZE
151
.global interrupt_level_12_handler
152
interrupt_level_12_handler:
153
	INTERRUPT_LEVEL_N_HANDLER 12
154
 
155
/* TT = 0x4d, TL = 0, interrupt_level_13 handler */
156
.org trap_table + TT_INTERRUPT_LEVEL_13*ENTRY_SIZE
157
.global interrupt_level_13_handler
158
interrupt_level_13_handler:
159
	INTERRUPT_LEVEL_N_HANDLER 13
160
 
161
/* TT = 0x4e, TL = 0, interrupt_level_14 handler */
162
.org trap_table + TT_INTERRUPT_LEVEL_14*ENTRY_SIZE
163
.global interrupt_level_14_handler
164
interrupt_level_14_handler:
165
	INTERRUPT_LEVEL_N_HANDLER 14
166
 
167
/* TT = 0x4f, TL = 0, interrupt_level_15 handler */
168
.org trap_table + TT_INTERRUPT_LEVEL_15*ENTRY_SIZE
169
.global interrupt_level_15_handler
170
interrupt_level_15_handler:
171
	INTERRUPT_LEVEL_N_HANDLER 15
172
 
663 jermar 173
/* TT = 0x60, TL = 0, interrupt_vector_trap handler */
174
.org trap_table + TT_INTERRUPT_VECTOR_TRAP*ENTRY_SIZE
175
.global interrupt_vector_trap_handler
176
interrupt_vector_trap_handler:
177
	INTERRUPT_VECTOR_TRAP_HANDLER
178
 
863 jermar 179
/* TT = 0x64, TL = 0, fast_instruction_access_MMU_miss */
180
.org trap_table + TT_FAST_INSTRUCTION_ACCESS_MMU_MISS*ENTRY_SIZE
181
.global fast_instruction_access_mmu_miss_handler
182
fast_instruction_access_mmu_miss_handler:
183
	FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER
184
 
185
/* TT = 0x68, TL = 0, fast_data_access_MMU_miss */
186
.org trap_table + TT_FAST_DATA_ACCESS_MMU_MISS*ENTRY_SIZE
187
.global fast_data_access_mmu_miss_handler
188
fast_data_access_mmu_miss_handler:
189
	FAST_DATA_ACCESS_MMU_MISS_HANDLER
190
 
191
/* TT = 0x6c, TL = 0, fast_data_access_protection */
192
.org trap_table + TT_FAST_DATA_ACCESS_PROTECTION*ENTRY_SIZE
193
.global fast_data_access_protection_handler
194
fast_data_access_protection_handler:
195
	FAST_DATA_ACCESS_PROTECTION_HANDLER
196
 
663 jermar 197
/* TT = 0x80, TL = 0, spill_0_normal handler */
634 jermar 198
.org trap_table + TT_SPILL_0_NORMAL*ENTRY_SIZE
630 jermar 199
.global spill_0_normal
200
spill_0_normal:
201
	SPILL_NORMAL_HANDLER
529 jermar 202
 
663 jermar 203
/* TT = 0xc0, TL = 0, fill_0_normal handler */
634 jermar 204
.org trap_table + TT_FILL_0_NORMAL*ENTRY_SIZE
663 jermar 205
.global fill_0_normal
630 jermar 206
fill_0_normal:
207
	FILL_NORMAL_HANDLER
208
 
529 jermar 209
/*
663 jermar 210
 * Handlers for TL>0.
529 jermar 211
 */
212
 
667 jermar 213
/* TT = 0x08, TL > 0, instruction_access_exception */
214
.org trap_table + (TT_INSTRUCTION_ACCESS_EXCEPTION+512)*ENTRY_SIZE
215
.global instruction_access_exception_high
216
instruction_access_exception_high:
217
	SIMPLE_HANDLER do_instruction_access_exc
218
 
663 jermar 219
/* TT = 0x24, TL > 0, clean_window handler */
220
.org trap_table + (TT_CLEAN_WINDOW+512)*ENTRY_SIZE
221
.global clean_window_handler_high
222
clean_window_handler_high:
223
	CLEAN_WINDOW_HANDLER
529 jermar 224
 
667 jermar 225
/* TT = 0x34, TL > 0, mem_address_not_aligned */
226
.org trap_table + (TT_MEM_ADDRESS_NOT_ALIGNED+512)*ENTRY_SIZE
227
.global mem_address_not_aligned_high
228
mem_address_not_aligned_high:
229
	SIMPLE_HANDLER do_mem_address_not_aligned
529 jermar 230
 
863 jermar 231
/* TT = 0x64, TL > 0, fast_instruction_access_MMU_miss */
232
.org trap_table + (TT_FAST_INSTRUCTION_ACCESS_MMU_MISS+512)*ENTRY_SIZE
233
.global fast_instruction_access_mmu_miss_handler_high
234
fast_instruction_access_mmu_miss_handler_high:
235
	FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER
236
 
237
/* TT = 0x68, TL > 0, fast_data_access_MMU_miss */
238
.org trap_table + (TT_FAST_DATA_ACCESS_MMU_MISS+512)*ENTRY_SIZE
239
.global fast_data_access_mmu_miss_handler_high
240
fast_data_access_mmu_miss_handler_high:
241
	FAST_DATA_ACCESS_MMU_MISS_HANDLER
242
 
243
/* TT = 0x6c, TL > 0, fast_data_access_protection */
244
.org trap_table + (TT_FAST_DATA_ACCESS_PROTECTION+512)*ENTRY_SIZE
245
.global fast_data_access_protection_handler_high
246
fast_data_access_protection_handler_high:
247
	FAST_DATA_ACCESS_PROTECTION_HANDLER
248
 
663 jermar 249
/* TT = 0x80, TL > 0, spill_0_normal handler */
250
.org trap_table + (TT_SPILL_0_NORMAL+512)*ENTRY_SIZE
251
.global spill_0_normal_high
252
spill_0_normal_high:
253
	SPILL_NORMAL_HANDLER
529 jermar 254
 
663 jermar 255
/* TT = 0xc0, TL > 0, fill_0_normal handler */
256
.org trap_table + (TT_FILL_0_NORMAL+512)*ENTRY_SIZE
257
.global fill_0_normal_high
258
fill_0_normal_high:
259
	FILL_NORMAL_HANDLER
634 jermar 260
 
663 jermar 261
 
262
 
634 jermar 263
/*
264
 * Save trap table.
265
 */
663 jermar 266
.align TABLE_SIZE
634 jermar 267
.global trap_table_save
268
trap_table_save:
269
	.space TABLE_SIZE, 0
666 jermar 270
 
271
 
667 jermar 272
/* Preemptible trap handler.
666 jermar 273
 *
667 jermar 274
 * This trap handler makes arrangements to
275
 * make calling scheduler() possible.
276
 *
277
 * The caller is responsible for doing save
278
 * and allocating PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE
279
 * bytes on stack.
280
 *
666 jermar 281
 * Input registers:
282
 * 	%l0	 	Address of function to call.
283
 * Output registers:
284
 *	 %l1 - %l7 	Copy of %g1 - %g7
285
 */
667 jermar 286
.global preemptible_handler
287
preemptible_handler:
288
	/*
289
	 * Save TSTATE, TPC, TNPC and PSTATE aside.
290
	 */
291
	rdpr %tstate, %g1
292
	rdpr %tpc, %g2
293
	rdpr %tnpc, %g3
294
	rdpr %pstate, %g4
295
 
296
	stx %g1, [%fp + STACK_BIAS + SAVED_TSTATE]
297
	stx %g2, [%fp + STACK_BIAS + SAVED_TPC]
298
	stx %g3, [%fp + STACK_BIAS + SAVED_TNPC]
299
	stx %g4, [%fp + STACK_BIAS + SAVED_PSTATE]
300
 
301
	/*
302
	 * Write 0 to TL.
303
	 */
304
	wrpr %g0, 0, %tl
305
 
306
	/*
307
	 * Alter PSTATE.
308
	 * - switch to normal globals.
309
	 */
310
	and %g4, ~1, %g4		! mask alternate globals
311
	wrpr %g4, 0, %pstate
312
 
313
	/*
314
	 * Save the normal globals.
315
	 */
666 jermar 316
	SAVE_GLOBALS
667 jermar 317
 
318
	/*
319
	 * Call the higher-level handler.
320
	 */
666 jermar 321
	call %l0
322
	nop
667 jermar 323
 
324
	/*
325
	 * Restore the normal global register set.
326
	 */
666 jermar 327
	RESTORE_GLOBALS
667 jermar 328
 
329
	/*
330
	 * Restore PSTATE from saved copy.
331
	 * Alternate globals become active.
332
	 */
333
	ldx [%fp + STACK_BIAS + SAVED_PSTATE], %l4
334
	wrpr %l4, 0, %pstate
335
 
336
	/*
337
	 * Write 1 to TL.
338
	 */
339
	wrpr %g0, 1, %tl
340
 
341
	/*
342
	 * Read TSTATE, TPC and TNPC from saved copy.
343
	 */
344
	ldx [%fp + STACK_BIAS + SAVED_TSTATE], %g1
345
	ldx [%fp + STACK_BIAS + SAVED_TPC], %g2
346
	ldx [%fp + STACK_BIAS + SAVED_TNPC], %g3
347
 
348
	/*
349
	 * Do restore to match the save instruction from the top-level handler.
350
	 */
351
	restore
352
 
353
	/*
354
	 * On execution of retry instruction, CWP will be restored from TSTATE register.
355
	 * However, because of scheduling, it is possible that CWP in saved TSTATE
356
	 * is different from current CWP. The following chunk of code fixes CWP
357
	 * in the saved copy of TSTATE.
358
	 */
359
	rdpr %cwp, %g4		! read current CWP
360
	and %g1, ~0x1f, %g1	! clear CWP field in saved TSTATE
361
	or %g1, %g4, %g1	! write current CWP to TSTATE
362
 
363
	/*
364
	 * Restore TSTATE, TPC and TNPC from saved copies.
365
	 */
366
	wrpr %g1, 0, %tstate
367
	wrpr %g2, 0, %tpc
368
	wrpr %g3, 0, %tnpc
369
 
370
	/*
371
	 * Return from interrupt.
372
	 */
666 jermar 373
	retry