Stuck at home?

Check our new online training!

Stuck at home?

All Bootlin training courses
are now available
through on-line seminars

Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/*
 * arch/score/kernel/entry.S
 *
 * Score Processor version.
 *
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Chen Liqin <liqin.chen@sunplusct.com>
 *  Lennox Wu <lennox.wu@sunplusct.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/linkage.h>

#include <asm/asmmacro.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>

/*
 * disable interrupts.
 */
.macro	disable_irq
	mfcr	r8, cr0
	srli	r8, r8, 1
	slli	r8, r8, 1
	mtcr	r8, cr0
	nop
	nop
	nop
	nop
	nop
.endm

/*
 * enable interrupts.
 */
.macro	enable_irq
	mfcr	r8, cr0
	ori	r8, 1
	mtcr	r8, cr0
	nop
	nop
	nop
	nop
	nop
.endm

__INIT
ENTRY(debug_exception_vector)
	nop!
	nop!
	nop!
	nop!
	nop!
	nop!
	nop!
	nop!

ENTRY(general_exception_vector)			# should move to addr 0x200
	j	general_exception
	nop!
	nop!
	nop!
	nop!
	nop!
	nop!

ENTRY(interrupt_exception_vector)		# should move to addr 0x210
	j	interrupt_exception
	nop!
	nop!
	nop!
	nop!
	nop!
	nop!

	.section ".text", "ax"
	.align	2;
general_exception:
	mfcr	r31, cr2
	nop
	la	r30, exception_handlers
	andi	r31, 0x1f			# get ecr.exc_code
	slli	r31, r31, 2
	add	r30, r30, r31
	lw	r30, [r30]
	br	r30

interrupt_exception:
	SAVE_ALL
	mfcr	r4, cr2
	nop
	lw	r16, [r28, TI_REGS]
	sw	r0, [r28, TI_REGS]
	la	r3, ret_from_irq
	srli	r4, r4, 18			# get ecr.ip[7:2], interrupt No.
	mv	r5, r0
	j	do_IRQ

ENTRY(handle_nmi)				# NMI #1
	SAVE_ALL
	mv	r4, r0
	la	r8, nmi_exception_handler
	brl	r8
	j	restore_all

ENTRY(handle_adelinsn)				# AdEL-instruction #2
	SAVE_ALL
	mfcr	r8, cr6
	nop
	nop
	sw	r8, [r0, PT_EMA]
	mv	r4, r0
	la	r8, do_adelinsn
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_ibe)				# BusEL-instruction #5
	SAVE_ALL
	mv	r4, r0
	la	r8, do_be
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_pel)				# P-EL #6
	SAVE_ALL
	mv	r4, r0
	la	r8, do_pel
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_ccu)				# CCU #8
	SAVE_ALL
	mv	r4, r0
	la	r8, do_ccu
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_ri)				# RI #9
	SAVE_ALL
	mv	r4, r0
	la	r8, do_ri
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_tr)				# Trap #10
	SAVE_ALL
	mv	r4, r0
	la	r8, do_tr
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_adedata)				# AdES-instruction #12
	SAVE_ALL
	mfcr	r8, cr6
	nop
	nop
	sw	r8, [r0, PT_EMA]
	mv	r4, r0
	la	r8, do_adedata
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_cee)				# CeE #16
	SAVE_ALL
	mv	r4, r0
	la	r8, do_cee
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_cpe)				# CpE #17
	SAVE_ALL
	mv	r4, r0
	la	r8, do_cpe
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_dbe)				# BusEL-data #18
	SAVE_ALL
	mv	r4, r0
	la	r8, do_be
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

ENTRY(handle_reserved)				# others
	SAVE_ALL
	mv	r4, r0
	la	r8, do_reserved
	brl	r8
	mv	r4, r0
	j	ret_from_exception
	nop

#ifndef CONFIG_PREEMPT
#define resume_kernel	restore_all
#else
#define __ret_from_irq	ret_from_exception
#endif

	.align	2
#ifndef CONFIG_PREEMPT
ENTRY(ret_from_exception)
	disable_irq			# preempt stop
	nop
	j	__ret_from_irq
	nop
#endif

ENTRY(ret_from_irq)
	sw	r16, [r28, TI_REGS]

ENTRY(__ret_from_irq)
	lw	r8, [r0, PT_PSR]	# returning to kernel mode?
	andri.c	r8, r8, KU_USER
	beq	resume_kernel

resume_userspace:
	disable_irq
	lw	r6, [r28, TI_FLAGS]	# current->work
	li	r8, _TIF_WORK_MASK
	and.c	r8, r8, r6		# ignoring syscall_trace
	bne	work_pending
	nop
	j	restore_all
	nop

#ifdef CONFIG_PREEMPT
resume_kernel:
	disable_irq
	lw	r8, [r28, TI_PRE_COUNT]
	cmpz.c	r8
	bne	restore_all
need_resched:
	lw	r8, [r28, TI_FLAGS]
	andri.c	r9, r8, _TIF_NEED_RESCHED
	beq	restore_all
	lw	r8, [r28, PT_PSR]		# Interrupts off?
	andri.c	r8, r8, 1
	beq	restore_all
	bl	preempt_schedule_irq
	nop
	j	need_resched
	nop
#endif

ENTRY(ret_from_kernel_thread)
	bl	schedule_tail			# r4=struct task_struct *prev
	nop
	mv	r4, r13
	brl	r12
	j	syscall_exit

ENTRY(ret_from_fork)
	bl	schedule_tail			# r4=struct task_struct *prev

ENTRY(syscall_exit)
	nop
	disable_irq
	lw	r6, [r28, TI_FLAGS]		# current->work
	li	r8, _TIF_WORK_MASK
	and.c	r8, r6, r8
	bne	syscall_exit_work

ENTRY(restore_all)					# restore full frame
	RESTORE_ALL_AND_RET

work_pending:
	andri.c	r8, r6, _TIF_NEED_RESCHED # r6 is preloaded with TI_FLAGS
	beq	work_notifysig
work_resched:
	bl	schedule
	nop
	disable_irq
	lw	r6, [r28, TI_FLAGS]
	li	r8, _TIF_WORK_MASK
	and.c	r8, r6, r8	# is there any work to be done
				# other than syscall tracing?
	beq	restore_all
	andri.c	r8, r6, _TIF_NEED_RESCHED
	bne	work_resched

work_notifysig:
	mv	r4, r0
	li	r5, 0
	bl	do_notify_resume	# r6 already loaded
	nop
	j	resume_userspace
	nop

ENTRY(syscall_exit_work)
	li	r8, _TIF_SYSCALL_TRACE
	and.c	r8, r8, r6		# r6 is preloaded with TI_FLAGS
	beq	work_pending		# trace bit set?
	nop
	enable_irq
	mv	r4, r0
	li	r5, 1
	bl	do_syscall_trace
	nop
	b	resume_userspace
	nop

.macro	save_context	reg
	sw	r12, [\reg, THREAD_REG12];
	sw	r13, [\reg, THREAD_REG13];
	sw	r14, [\reg, THREAD_REG14];
	sw	r15, [\reg, THREAD_REG15];
	sw	r16, [\reg, THREAD_REG16];
	sw	r17, [\reg, THREAD_REG17];
	sw	r18, [\reg, THREAD_REG18];
	sw	r19, [\reg, THREAD_REG19];
	sw	r20, [\reg, THREAD_REG20];
	sw	r21, [\reg, THREAD_REG21];
	sw	r29, [\reg, THREAD_REG29];
	sw	r2, [\reg, THREAD_REG2];
	sw	r0, [\reg, THREAD_REG0]
.endm

.macro	restore_context	reg
	lw	r12, [\reg, THREAD_REG12];
	lw	r13, [\reg, THREAD_REG13];
	lw	r14, [\reg, THREAD_REG14];
	lw	r15, [\reg, THREAD_REG15];
	lw	r16, [\reg, THREAD_REG16];
	lw	r17, [\reg, THREAD_REG17];
	lw	r18, [\reg, THREAD_REG18];
	lw	r19, [\reg, THREAD_REG19];
	lw	r20, [\reg, THREAD_REG20];
	lw	r21, [\reg, THREAD_REG21];
	lw	r29, [\reg, THREAD_REG29];
	lw	r0, [\reg, THREAD_REG0];
	lw	r2, [\reg, THREAD_REG2];
	lw	r3, [\reg, THREAD_REG3]
.endm

/*
 * task_struct *resume(task_struct *prev, task_struct *next,
 *			struct thread_info *next_ti)
 */
ENTRY(resume)
	mfcr	r9, cr0
	nop
	nop
	sw	r9, [r4, THREAD_PSR]
	save_context	r4
	sw	r3, [r4, THREAD_REG3]

	mv	r28, r6
	restore_context	r5
	mv	r8, r6
	addi	r8, KERNEL_STACK_SIZE
	subi	r8, 32
	la 	r9, kernelsp;
	sw 	r8, [r9];

	mfcr	r9, cr0
	ldis	r7, 0x00ff
	nop
	and	r9, r9, r7
	lw	r6, [r5, THREAD_PSR]
	not	r7, r7
	and	r6, r6, r7
	or	r6, r6, r9
	mtcr	r6, cr0
	nop; nop; nop; nop; nop
	br	r3

ENTRY(handle_sys)
	SAVE_ALL
	sw	r8, [r0, 16]		# argument 5 from user r8
	sw	r9, [r0, 20]		# argument 6 from user r9
	enable_irq

	sw	r4, [r0, PT_ORIG_R4]	#for restart syscall
	sw	r7, [r0, PT_ORIG_R7]	#for restart syscall
	sw	r27, [r0, PT_IS_SYSCALL] # it from syscall

	lw	r9, [r0, PT_EPC]	# skip syscall on return
	addi	r9, 4
	sw	r9, [r0, PT_EPC]

	cmpi.c	r27, __NR_syscalls 	# check syscall number
	bcs	illegal_syscall

	slli	r8, r27, 2		# get syscall routine
	la	r11, sys_call_table
	add	r11, r11, r8
	lw	r10, [r11]		# get syscall entry

	cmpz.c	r10
	beq	illegal_syscall

	lw	r8, [r28, TI_FLAGS]
	li	r9, _TIF_SYSCALL_TRACE
	and.c	r8, r8, r9
	bne	syscall_trace_entry

	brl	r10			# Do The Real system call

	cmpi.c	r4, 0
	blt	1f
	ldi	r8, 0
	sw	r8, [r0, PT_R7]
	b 2f
1:
	cmpi.c	r4, -MAX_ERRNO - 1
	ble	2f
	ldi	r8, 0x1;
	sw	r8, [r0, PT_R7]
	neg	r4, r4
2:
	sw	r4, [r0, PT_R4]		# save result

syscall_return:
	disable_irq
	lw	r6, [r28, TI_FLAGS]	# current->work
	li	r8, _TIF_WORK_MASK
	and.c	r8, r6, r8
	bne	syscall_return_work
	j	restore_all

syscall_return_work:
	j	syscall_exit_work

syscall_trace_entry:
	mv	r16, r10
	mv	r4, r0
	li	r5, 0
	bl	do_syscall_trace

	mv	r8, r16
	lw	r4, [r0, PT_R4]		# Restore argument registers
	lw	r5, [r0, PT_R5]
	lw	r6, [r0, PT_R6]
	lw	r7, [r0, PT_R7]
	brl	r8

	li	r8, -MAX_ERRNO - 1
	sw	r8, [r0, PT_R7]		# set error flag

	neg	r4, r4			# error
	sw	r4, [r0, PT_R0]		# set flag for syscall
					# restarting
1:	sw	r4, [r0, PT_R2]		# result
	j	syscall_exit

illegal_syscall:
	ldi	r4, -ENOSYS		# error
	sw	r4, [r0, PT_ORIG_R4]
	sw	r4, [r0, PT_R4]
	ldi	r9, 1			# set error flag
	sw	r9, [r0, PT_R7]
	j	syscall_return

ENTRY(sys_rt_sigreturn)
	mv	r4, r0
	la	r8, score_rt_sigreturn
	br	r8