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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Copyright (C) 2002, 2007 Maciej W. Rozycki
9 * Copyright (C) 2001, 2012 MIPS Technologies, Inc. All rights reserved.
10 */
11#include <linux/init.h>
12
13#include <asm/asm.h>
14#include <asm/asmmacro.h>
15#include <asm/cacheops.h>
16#include <asm/irqflags.h>
17#include <asm/regdef.h>
18#include <asm/fpregdef.h>
19#include <asm/mipsregs.h>
20#include <asm/stackframe.h>
21#include <asm/war.h>
22#include <asm/thread_info.h>
23
24 __INIT
25
26/*
27 * General exception vector for all other CPUs.
28 *
29 * Be careful when changing this, it has to be at most 128 bytes
30 * to fit into space reserved for the exception handler.
31 */
32NESTED(except_vec3_generic, 0, sp)
33 .set push
34 .set noat
35#if R5432_CP0_INTERRUPT_WAR
36 mfc0 k0, CP0_INDEX
37#endif
38 mfc0 k1, CP0_CAUSE
39 andi k1, k1, 0x7c
40#ifdef CONFIG_64BIT
41 dsll k1, k1, 1
42#endif
43 PTR_L k0, exception_handlers(k1)
44 jr k0
45 .set pop
46 END(except_vec3_generic)
47
48/*
49 * General exception handler for CPUs with virtual coherency exception.
50 *
51 * Be careful when changing this, it has to be at most 256 (as a special
52 * exception) bytes to fit into space reserved for the exception handler.
53 */
54NESTED(except_vec3_r4000, 0, sp)
55 .set push
56 .set arch=r4000
57 .set noat
58 mfc0 k1, CP0_CAUSE
59 li k0, 31<<2
60 andi k1, k1, 0x7c
61 .set push
62 .set noreorder
63 .set nomacro
64 beq k1, k0, handle_vced
65 li k0, 14<<2
66 beq k1, k0, handle_vcei
67#ifdef CONFIG_64BIT
68 dsll k1, k1, 1
69#endif
70 .set pop
71 PTR_L k0, exception_handlers(k1)
72 jr k0
73
74 /*
75 * Big shit, we now may have two dirty primary cache lines for the same
76 * physical address. We can safely invalidate the line pointed to by
77 * c0_badvaddr because after return from this exception handler the
78 * load / store will be re-executed.
79 */
80handle_vced:
81 MFC0 k0, CP0_BADVADDR
82 li k1, -4 # Is this ...
83 and k0, k1 # ... really needed?
84 mtc0 zero, CP0_TAGLO
85 cache Index_Store_Tag_D, (k0)
86 cache Hit_Writeback_Inv_SD, (k0)
87#ifdef CONFIG_PROC_FS
88 PTR_LA k0, vced_count
89 lw k1, (k0)
90 addiu k1, 1
91 sw k1, (k0)
92#endif
93 eret
94
95handle_vcei:
96 MFC0 k0, CP0_BADVADDR
97 cache Hit_Writeback_Inv_SD, (k0) # also cleans pi
98#ifdef CONFIG_PROC_FS
99 PTR_LA k0, vcei_count
100 lw k1, (k0)
101 addiu k1, 1
102 sw k1, (k0)
103#endif
104 eret
105 .set pop
106 END(except_vec3_r4000)
107
108 __FINIT
109
110 .align 5 /* 32 byte rollback region */
111LEAF(__r4k_wait)
112 .set push
113 .set noreorder
114 /* start of rollback region */
115 LONG_L t0, TI_FLAGS($28)
116 nop
117 andi t0, _TIF_NEED_RESCHED
118 bnez t0, 1f
119 nop
120 nop
121 nop
122#ifdef CONFIG_CPU_MICROMIPS
123 nop
124 nop
125 nop
126 nop
127#endif
128 .set MIPS_ISA_ARCH_LEVEL_RAW
129 wait
130 /* end of rollback region (the region size must be power of two) */
1311:
132 jr ra
133 nop
134 .set pop
135 END(__r4k_wait)
136
137 .macro BUILD_ROLLBACK_PROLOGUE handler
138 FEXPORT(rollback_\handler)
139 .set push
140 .set noat
141 MFC0 k0, CP0_EPC
142 PTR_LA k1, __r4k_wait
143 ori k0, 0x1f /* 32 byte rollback region */
144 xori k0, 0x1f
145 bne k0, k1, \handler
146 MTC0 k0, CP0_EPC
147 .set pop
148 .endm
149
150 .align 5
151BUILD_ROLLBACK_PROLOGUE handle_int
152NESTED(handle_int, PT_SIZE, sp)
153 .cfi_signal_frame
154#ifdef CONFIG_TRACE_IRQFLAGS
155 /*
156 * Check to see if the interrupted code has just disabled
157 * interrupts and ignore this interrupt for now if so.
158 *
159 * local_irq_disable() disables interrupts and then calls
160 * trace_hardirqs_off() to track the state. If an interrupt is taken
161 * after interrupts are disabled but before the state is updated
162 * it will appear to restore_all that it is incorrectly returning with
163 * interrupts disabled
164 */
165 .set push
166 .set noat
167 mfc0 k0, CP0_STATUS
168#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
169 and k0, ST0_IEP
170 bnez k0, 1f
171
172 mfc0 k0, CP0_EPC
173 .set noreorder
174 j k0
175 rfe
176#else
177 and k0, ST0_IE
178 bnez k0, 1f
179
180 eret
181#endif
1821:
183 .set pop
184#endif
185 SAVE_ALL docfi=1
186 CLI
187 TRACE_IRQS_OFF
188
189 LONG_L s0, TI_REGS($28)
190 LONG_S sp, TI_REGS($28)
191
192 /*
193 * SAVE_ALL ensures we are using a valid kernel stack for the thread.
194 * Check if we are already using the IRQ stack.
195 */
196 move s1, sp # Preserve the sp
197
198 /* Get IRQ stack for this CPU */
199 ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG
200#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
201 lui k1, %hi(irq_stack)
202#else
203 lui k1, %highest(irq_stack)
204 daddiu k1, %higher(irq_stack)
205 dsll k1, 16
206 daddiu k1, %hi(irq_stack)
207 dsll k1, 16
208#endif
209 LONG_SRL k0, SMP_CPUID_PTRSHIFT
210 LONG_ADDU k1, k0
211 LONG_L t0, %lo(irq_stack)(k1)
212
213 # Check if already on IRQ stack
214 PTR_LI t1, ~(_THREAD_SIZE-1)
215 and t1, t1, sp
216 beq t0, t1, 2f
217
218 /* Switch to IRQ stack */
219 li t1, _IRQ_STACK_START
220 PTR_ADD sp, t0, t1
221
222 /* Save task's sp on IRQ stack so that unwinding can follow it */
223 LONG_S s1, 0(sp)
2242:
225 jal plat_irq_dispatch
226
227 /* Restore sp */
228 move sp, s1
229
230 j ret_from_irq
231#ifdef CONFIG_CPU_MICROMIPS
232 nop
233#endif
234 END(handle_int)
235
236 __INIT
237
238/*
239 * Special interrupt vector for MIPS64 ISA & embedded MIPS processors.
240 * This is a dedicated interrupt exception vector which reduces the
241 * interrupt processing overhead. The jump instruction will be replaced
242 * at the initialization time.
243 *
244 * Be careful when changing this, it has to be at most 128 bytes
245 * to fit into space reserved for the exception handler.
246 */
247NESTED(except_vec4, 0, sp)
2481: j 1b /* Dummy, will be replaced */
249 END(except_vec4)
250
251/*
252 * EJTAG debug exception handler.
253 * The EJTAG debug exception entry point is 0xbfc00480, which
254 * normally is in the boot PROM, so the boot PROM must do an
255 * unconditional jump to this vector.
256 */
257NESTED(except_vec_ejtag_debug, 0, sp)
258 j ejtag_debug_handler
259#ifdef CONFIG_CPU_MICROMIPS
260 nop
261#endif
262 END(except_vec_ejtag_debug)
263
264 __FINIT
265
266/*
267 * Vectored interrupt handler.
268 * This prototype is copied to ebase + n*IntCtl.VS and patched
269 * to invoke the handler
270 */
271BUILD_ROLLBACK_PROLOGUE except_vec_vi
272NESTED(except_vec_vi, 0, sp)
273 SAVE_SOME docfi=1
274 SAVE_AT docfi=1
275 .set push
276 .set noreorder
277 PTR_LA v1, except_vec_vi_handler
278FEXPORT(except_vec_vi_lui)
279 lui v0, 0 /* Patched */
280 jr v1
281FEXPORT(except_vec_vi_ori)
282 ori v0, 0 /* Patched */
283 .set pop
284 END(except_vec_vi)
285EXPORT(except_vec_vi_end)
286
287/*
288 * Common Vectored Interrupt code
289 * Complete the register saves and invoke the handler which is passed in $v0
290 */
291NESTED(except_vec_vi_handler, 0, sp)
292 SAVE_TEMP
293 SAVE_STATIC
294 CLI
295#ifdef CONFIG_TRACE_IRQFLAGS
296 move s0, v0
297 TRACE_IRQS_OFF
298 move v0, s0
299#endif
300
301 LONG_L s0, TI_REGS($28)
302 LONG_S sp, TI_REGS($28)
303
304 /*
305 * SAVE_ALL ensures we are using a valid kernel stack for the thread.
306 * Check if we are already using the IRQ stack.
307 */
308 move s1, sp # Preserve the sp
309
310 /* Get IRQ stack for this CPU */
311 ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG
312#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
313 lui k1, %hi(irq_stack)
314#else
315 lui k1, %highest(irq_stack)
316 daddiu k1, %higher(irq_stack)
317 dsll k1, 16
318 daddiu k1, %hi(irq_stack)
319 dsll k1, 16
320#endif
321 LONG_SRL k0, SMP_CPUID_PTRSHIFT
322 LONG_ADDU k1, k0
323 LONG_L t0, %lo(irq_stack)(k1)
324
325 # Check if already on IRQ stack
326 PTR_LI t1, ~(_THREAD_SIZE-1)
327 and t1, t1, sp
328 beq t0, t1, 2f
329
330 /* Switch to IRQ stack */
331 li t1, _IRQ_STACK_START
332 PTR_ADD sp, t0, t1
333
334 /* Save task's sp on IRQ stack so that unwinding can follow it */
335 LONG_S s1, 0(sp)
3362:
337 jalr v0
338
339 /* Restore sp */
340 move sp, s1
341
342 j ret_from_irq
343 END(except_vec_vi_handler)
344
345/*
346 * EJTAG debug exception handler.
347 */
348NESTED(ejtag_debug_handler, PT_SIZE, sp)
349 .set push
350 .set noat
351 MTC0 k0, CP0_DESAVE
352 mfc0 k0, CP0_DEBUG
353
354 sll k0, k0, 30 # Check for SDBBP.
355 bgez k0, ejtag_return
356
357 PTR_LA k0, ejtag_debug_buffer
358 LONG_S k1, 0(k0)
359 SAVE_ALL
360 move a0, sp
361 jal ejtag_exception_handler
362 RESTORE_ALL
363 PTR_LA k0, ejtag_debug_buffer
364 LONG_L k1, 0(k0)
365
366ejtag_return:
367 MFC0 k0, CP0_DESAVE
368 .set mips32
369 deret
370 .set pop
371 END(ejtag_debug_handler)
372
373/*
374 * This buffer is reserved for the use of the EJTAG debug
375 * handler.
376 */
377 .data
378EXPORT(ejtag_debug_buffer)
379 .fill LONGSIZE
380 .previous
381
382 __INIT
383
384/*
385 * NMI debug exception handler for MIPS reference boards.
386 * The NMI debug exception entry point is 0xbfc00000, which
387 * normally is in the boot PROM, so the boot PROM must do a
388 * unconditional jump to this vector.
389 */
390NESTED(except_vec_nmi, 0, sp)
391 j nmi_handler
392#ifdef CONFIG_CPU_MICROMIPS
393 nop
394#endif
395 END(except_vec_nmi)
396
397 __FINIT
398
399NESTED(nmi_handler, PT_SIZE, sp)
400 .cfi_signal_frame
401 .set push
402 .set noat
403 /*
404 * Clear ERL - restore segment mapping
405 * Clear BEV - required for page fault exception handler to work
406 */
407 mfc0 k0, CP0_STATUS
408 ori k0, k0, ST0_EXL
409 li k1, ~(ST0_BEV | ST0_ERL)
410 and k0, k0, k1
411 mtc0 k0, CP0_STATUS
412 _ehb
413 SAVE_ALL
414 move a0, sp
415 jal nmi_exception_handler
416 /* nmi_exception_handler never returns */
417 .set pop
418 END(nmi_handler)
419
420 .macro __build_clear_none
421 .endm
422
423 .macro __build_clear_sti
424 TRACE_IRQS_ON
425 STI
426 .endm
427
428 .macro __build_clear_cli
429 CLI
430 TRACE_IRQS_OFF
431 .endm
432
433 .macro __build_clear_fpe
434 .set push
435 /* gas fails to assemble cfc1 for some archs (octeon).*/ \
436 .set mips1
437 SET_HARDFLOAT
438 cfc1 a1, fcr31
439 .set pop
440 CLI
441 TRACE_IRQS_OFF
442 .endm
443
444 .macro __build_clear_msa_fpe
445 _cfcmsa a1, MSA_CSR
446 CLI
447 TRACE_IRQS_OFF
448 .endm
449
450 .macro __build_clear_ade
451 MFC0 t0, CP0_BADVADDR
452 PTR_S t0, PT_BVADDR(sp)
453 KMODE
454 .endm
455
456 .macro __BUILD_silent exception
457 .endm
458
459 /* Gas tries to parse the PRINT argument as a string containing
460 string escapes and emits bogus warnings if it believes to
461 recognize an unknown escape code. So make the arguments
462 start with an n and gas will believe \n is ok ... */
463 .macro __BUILD_verbose nexception
464 LONG_L a1, PT_EPC(sp)
465#ifdef CONFIG_32BIT
466 PRINT("Got \nexception at %08lx\012")
467#endif
468#ifdef CONFIG_64BIT
469 PRINT("Got \nexception at %016lx\012")
470#endif
471 .endm
472
473 .macro __BUILD_count exception
474 LONG_L t0,exception_count_\exception
475 LONG_ADDIU t0, 1
476 LONG_S t0,exception_count_\exception
477 .comm exception_count\exception, 8, 8
478 .endm
479
480 .macro __BUILD_HANDLER exception handler clear verbose ext
481 .align 5
482 NESTED(handle_\exception, PT_SIZE, sp)
483 .cfi_signal_frame
484 .set noat
485 SAVE_ALL
486 FEXPORT(handle_\exception\ext)
487 __build_clear_\clear
488 .set at
489 __BUILD_\verbose \exception
490 move a0, sp
491 jal do_\handler
492 j ret_from_exception
493 END(handle_\exception)
494 .endm
495
496 .macro BUILD_HANDLER exception handler clear verbose
497 __BUILD_HANDLER \exception \handler \clear \verbose _int
498 .endm
499
500 BUILD_HANDLER adel ade ade silent /* #4 */
501 BUILD_HANDLER ades ade ade silent /* #5 */
502 BUILD_HANDLER ibe be cli silent /* #6 */
503 BUILD_HANDLER dbe be cli silent /* #7 */
504 BUILD_HANDLER bp bp sti silent /* #9 */
505 BUILD_HANDLER ri ri sti silent /* #10 */
506 BUILD_HANDLER cpu cpu sti silent /* #11 */
507 BUILD_HANDLER ov ov sti silent /* #12 */
508 BUILD_HANDLER tr tr sti silent /* #13 */
509 BUILD_HANDLER msa_fpe msa_fpe msa_fpe silent /* #14 */
510 BUILD_HANDLER fpe fpe fpe silent /* #15 */
511 BUILD_HANDLER ftlb ftlb none silent /* #16 */
512 BUILD_HANDLER msa msa sti silent /* #21 */
513 BUILD_HANDLER mdmx mdmx sti silent /* #22 */
514#ifdef CONFIG_HARDWARE_WATCHPOINTS
515 /*
516 * For watch, interrupts will be enabled after the watch
517 * registers are read.
518 */
519 BUILD_HANDLER watch watch cli silent /* #23 */
520#else
521 BUILD_HANDLER watch watch sti verbose /* #23 */
522#endif
523 BUILD_HANDLER mcheck mcheck cli verbose /* #24 */
524 BUILD_HANDLER mt mt sti silent /* #25 */
525 BUILD_HANDLER dsp dsp sti silent /* #26 */
526 BUILD_HANDLER reserved reserved sti verbose /* others */
527
528 .align 5
529 LEAF(handle_ri_rdhwr_tlbp)
530 .set push
531 .set noat
532 .set noreorder
533 /* check if TLB contains a entry for EPC */
534 MFC0 k1, CP0_ENTRYHI
535 andi k1, MIPS_ENTRYHI_ASID | MIPS_ENTRYHI_ASIDX
536 MFC0 k0, CP0_EPC
537 PTR_SRL k0, _PAGE_SHIFT + 1
538 PTR_SLL k0, _PAGE_SHIFT + 1
539 or k1, k0
540 MTC0 k1, CP0_ENTRYHI
541 mtc0_tlbw_hazard
542 tlbp
543 tlb_probe_hazard
544 mfc0 k1, CP0_INDEX
545 .set pop
546 bltz k1, handle_ri /* slow path */
547 /* fall thru */
548 END(handle_ri_rdhwr_tlbp)
549
550 LEAF(handle_ri_rdhwr)
551 .set push
552 .set noat
553 .set noreorder
554 /* MIPS32: 0x7c03e83b: rdhwr v1,$29 */
555 /* microMIPS: 0x007d6b3c: rdhwr v1,$29 */
556 MFC0 k1, CP0_EPC
557#if defined(CONFIG_CPU_MICROMIPS) || defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS64_R2)
558 and k0, k1, 1
559 beqz k0, 1f
560 xor k1, k0
561 lhu k0, (k1)
562 lhu k1, 2(k1)
563 ins k1, k0, 16, 16
564 lui k0, 0x007d
565 b docheck
566 ori k0, 0x6b3c
5671:
568 lui k0, 0x7c03
569 lw k1, (k1)
570 ori k0, 0xe83b
571#else
572 andi k0, k1, 1
573 bnez k0, handle_ri
574 lui k0, 0x7c03
575 lw k1, (k1)
576 ori k0, 0xe83b
577#endif
578 .set reorder
579docheck:
580 bne k0, k1, handle_ri /* if not ours */
581
582isrdhwr:
583 /* The insn is rdhwr. No need to check CAUSE.BD here. */
584 get_saved_sp /* k1 := current_thread_info */
585 .set noreorder
586 MFC0 k0, CP0_EPC
587#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
588 ori k1, _THREAD_MASK
589 xori k1, _THREAD_MASK
590 LONG_L v1, TI_TP_VALUE(k1)
591 LONG_ADDIU k0, 4
592 jr k0
593 rfe
594#else
595#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
596 LONG_ADDIU k0, 4 /* stall on $k0 */
597#else
598 .set at=v1
599 LONG_ADDIU k0, 4
600 .set noat
601#endif
602 MTC0 k0, CP0_EPC
603 /* I hope three instructions between MTC0 and ERET are enough... */
604 ori k1, _THREAD_MASK
605 xori k1, _THREAD_MASK
606 LONG_L v1, TI_TP_VALUE(k1)
607 .set arch=r4000
608 eret
609 .set mips0
610#endif
611 .set pop
612 END(handle_ri_rdhwr)
613
614#ifdef CONFIG_64BIT
615/* A temporary overflow handler used by check_daddi(). */
616
617 __INIT
618
619 BUILD_HANDLER daddi_ov daddi_ov none silent /* #12 */
620#endif
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Copyright (C) 2001 MIPS Technologies, Inc.
9 * Copyright (C) 2002, 2007 Maciej W. Rozycki
10 */
11#include <linux/init.h>
12
13#include <asm/asm.h>
14#include <asm/asmmacro.h>
15#include <asm/cacheops.h>
16#include <asm/irqflags.h>
17#include <asm/regdef.h>
18#include <asm/fpregdef.h>
19#include <asm/mipsregs.h>
20#include <asm/stackframe.h>
21#include <asm/war.h>
22#include <asm/page.h>
23#include <asm/thread_info.h>
24
25#define PANIC_PIC(msg) \
26 .set push; \
27 .set reorder; \
28 PTR_LA a0,8f; \
29 .set noat; \
30 PTR_LA AT, panic; \
31 jr AT; \
329: b 9b; \
33 .set pop; \
34 TEXT(msg)
35
36 __INIT
37
38NESTED(except_vec0_generic, 0, sp)
39 PANIC_PIC("Exception vector 0 called")
40 END(except_vec0_generic)
41
42NESTED(except_vec1_generic, 0, sp)
43 PANIC_PIC("Exception vector 1 called")
44 END(except_vec1_generic)
45
46/*
47 * General exception vector for all other CPUs.
48 *
49 * Be careful when changing this, it has to be at most 128 bytes
50 * to fit into space reserved for the exception handler.
51 */
52NESTED(except_vec3_generic, 0, sp)
53 .set push
54 .set noat
55#if R5432_CP0_INTERRUPT_WAR
56 mfc0 k0, CP0_INDEX
57#endif
58 mfc0 k1, CP0_CAUSE
59 andi k1, k1, 0x7c
60#ifdef CONFIG_64BIT
61 dsll k1, k1, 1
62#endif
63 PTR_L k0, exception_handlers(k1)
64 jr k0
65 .set pop
66 END(except_vec3_generic)
67
68/*
69 * General exception handler for CPUs with virtual coherency exception.
70 *
71 * Be careful when changing this, it has to be at most 256 (as a special
72 * exception) bytes to fit into space reserved for the exception handler.
73 */
74NESTED(except_vec3_r4000, 0, sp)
75 .set push
76 .set mips3
77 .set noat
78 mfc0 k1, CP0_CAUSE
79 li k0, 31<<2
80 andi k1, k1, 0x7c
81 .set push
82 .set noreorder
83 .set nomacro
84 beq k1, k0, handle_vced
85 li k0, 14<<2
86 beq k1, k0, handle_vcei
87#ifdef CONFIG_64BIT
88 dsll k1, k1, 1
89#endif
90 .set pop
91 PTR_L k0, exception_handlers(k1)
92 jr k0
93
94 /*
95 * Big shit, we now may have two dirty primary cache lines for the same
96 * physical address. We can safely invalidate the line pointed to by
97 * c0_badvaddr because after return from this exception handler the
98 * load / store will be re-executed.
99 */
100handle_vced:
101 MFC0 k0, CP0_BADVADDR
102 li k1, -4 # Is this ...
103 and k0, k1 # ... really needed?
104 mtc0 zero, CP0_TAGLO
105 cache Index_Store_Tag_D, (k0)
106 cache Hit_Writeback_Inv_SD, (k0)
107#ifdef CONFIG_PROC_FS
108 PTR_LA k0, vced_count
109 lw k1, (k0)
110 addiu k1, 1
111 sw k1, (k0)
112#endif
113 eret
114
115handle_vcei:
116 MFC0 k0, CP0_BADVADDR
117 cache Hit_Writeback_Inv_SD, (k0) # also cleans pi
118#ifdef CONFIG_PROC_FS
119 PTR_LA k0, vcei_count
120 lw k1, (k0)
121 addiu k1, 1
122 sw k1, (k0)
123#endif
124 eret
125 .set pop
126 END(except_vec3_r4000)
127
128 __FINIT
129
130 .align 5 /* 32 byte rollback region */
131LEAF(r4k_wait)
132 .set push
133 .set noreorder
134 /* start of rollback region */
135 LONG_L t0, TI_FLAGS($28)
136 nop
137 andi t0, _TIF_NEED_RESCHED
138 bnez t0, 1f
139 nop
140 nop
141 nop
142 .set mips3
143 wait
144 /* end of rollback region (the region size must be power of two) */
145 .set pop
1461:
147 jr ra
148 END(r4k_wait)
149
150 .macro BUILD_ROLLBACK_PROLOGUE handler
151 FEXPORT(rollback_\handler)
152 .set push
153 .set noat
154 MFC0 k0, CP0_EPC
155 PTR_LA k1, r4k_wait
156 ori k0, 0x1f /* 32 byte rollback region */
157 xori k0, 0x1f
158 bne k0, k1, 9f
159 MTC0 k0, CP0_EPC
1609:
161 .set pop
162 .endm
163
164 .align 5
165BUILD_ROLLBACK_PROLOGUE handle_int
166NESTED(handle_int, PT_SIZE, sp)
167#ifdef CONFIG_TRACE_IRQFLAGS
168 /*
169 * Check to see if the interrupted code has just disabled
170 * interrupts and ignore this interrupt for now if so.
171 *
172 * local_irq_disable() disables interrupts and then calls
173 * trace_hardirqs_off() to track the state. If an interrupt is taken
174 * after interrupts are disabled but before the state is updated
175 * it will appear to restore_all that it is incorrectly returning with
176 * interrupts disabled
177 */
178 .set push
179 .set noat
180 mfc0 k0, CP0_STATUS
181#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
182 and k0, ST0_IEP
183 bnez k0, 1f
184
185 mfc0 k0, CP0_EPC
186 .set noreorder
187 j k0
188 rfe
189#else
190 and k0, ST0_IE
191 bnez k0, 1f
192
193 eret
194#endif
1951:
196 .set pop
197#endif
198 SAVE_ALL
199 CLI
200 TRACE_IRQS_OFF
201
202 LONG_L s0, TI_REGS($28)
203 LONG_S sp, TI_REGS($28)
204 PTR_LA ra, ret_from_irq
205 j plat_irq_dispatch
206 END(handle_int)
207
208 __INIT
209
210/*
211 * Special interrupt vector for MIPS64 ISA & embedded MIPS processors.
212 * This is a dedicated interrupt exception vector which reduces the
213 * interrupt processing overhead. The jump instruction will be replaced
214 * at the initialization time.
215 *
216 * Be careful when changing this, it has to be at most 128 bytes
217 * to fit into space reserved for the exception handler.
218 */
219NESTED(except_vec4, 0, sp)
2201: j 1b /* Dummy, will be replaced */
221 END(except_vec4)
222
223/*
224 * EJTAG debug exception handler.
225 * The EJTAG debug exception entry point is 0xbfc00480, which
226 * normally is in the boot PROM, so the boot PROM must do a
227 * unconditional jump to this vector.
228 */
229NESTED(except_vec_ejtag_debug, 0, sp)
230 j ejtag_debug_handler
231 END(except_vec_ejtag_debug)
232
233 __FINIT
234
235/*
236 * Vectored interrupt handler.
237 * This prototype is copied to ebase + n*IntCtl.VS and patched
238 * to invoke the handler
239 */
240BUILD_ROLLBACK_PROLOGUE except_vec_vi
241NESTED(except_vec_vi, 0, sp)
242 SAVE_SOME
243 SAVE_AT
244 .set push
245 .set noreorder
246#ifdef CONFIG_MIPS_MT_SMTC
247 /*
248 * To keep from blindly blocking *all* interrupts
249 * during service by SMTC kernel, we also want to
250 * pass the IM value to be cleared.
251 */
252FEXPORT(except_vec_vi_mori)
253 ori a0, $0, 0
254#endif /* CONFIG_MIPS_MT_SMTC */
255FEXPORT(except_vec_vi_lui)
256 lui v0, 0 /* Patched */
257 j except_vec_vi_handler
258FEXPORT(except_vec_vi_ori)
259 ori v0, 0 /* Patched */
260 .set pop
261 END(except_vec_vi)
262EXPORT(except_vec_vi_end)
263
264/*
265 * Common Vectored Interrupt code
266 * Complete the register saves and invoke the handler which is passed in $v0
267 */
268NESTED(except_vec_vi_handler, 0, sp)
269 SAVE_TEMP
270 SAVE_STATIC
271#ifdef CONFIG_MIPS_MT_SMTC
272 /*
273 * SMTC has an interesting problem that interrupts are level-triggered,
274 * and the CLI macro will clear EXL, potentially causing a duplicate
275 * interrupt service invocation. So we need to clear the associated
276 * IM bit of Status prior to doing CLI, and restore it after the
277 * service routine has been invoked - we must assume that the
278 * service routine will have cleared the state, and any active
279 * level represents a new or otherwised unserviced event...
280 */
281 mfc0 t1, CP0_STATUS
282 and t0, a0, t1
283#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
284 mfc0 t2, CP0_TCCONTEXT
285 or t2, t0, t2
286 mtc0 t2, CP0_TCCONTEXT
287#endif /* CONFIG_MIPS_MT_SMTC_IM_BACKSTOP */
288 xor t1, t1, t0
289 mtc0 t1, CP0_STATUS
290 _ehb
291#endif /* CONFIG_MIPS_MT_SMTC */
292 CLI
293#ifdef CONFIG_TRACE_IRQFLAGS
294 move s0, v0
295#ifdef CONFIG_MIPS_MT_SMTC
296 move s1, a0
297#endif
298 TRACE_IRQS_OFF
299#ifdef CONFIG_MIPS_MT_SMTC
300 move a0, s1
301#endif
302 move v0, s0
303#endif
304
305 LONG_L s0, TI_REGS($28)
306 LONG_S sp, TI_REGS($28)
307 PTR_LA ra, ret_from_irq
308 jr v0
309 END(except_vec_vi_handler)
310
311/*
312 * EJTAG debug exception handler.
313 */
314NESTED(ejtag_debug_handler, PT_SIZE, sp)
315 .set push
316 .set noat
317 MTC0 k0, CP0_DESAVE
318 mfc0 k0, CP0_DEBUG
319
320 sll k0, k0, 30 # Check for SDBBP.
321 bgez k0, ejtag_return
322
323 PTR_LA k0, ejtag_debug_buffer
324 LONG_S k1, 0(k0)
325 SAVE_ALL
326 move a0, sp
327 jal ejtag_exception_handler
328 RESTORE_ALL
329 PTR_LA k0, ejtag_debug_buffer
330 LONG_L k1, 0(k0)
331
332ejtag_return:
333 MFC0 k0, CP0_DESAVE
334 .set mips32
335 deret
336 .set pop
337 END(ejtag_debug_handler)
338
339/*
340 * This buffer is reserved for the use of the EJTAG debug
341 * handler.
342 */
343 .data
344EXPORT(ejtag_debug_buffer)
345 .fill LONGSIZE
346 .previous
347
348 __INIT
349
350/*
351 * NMI debug exception handler for MIPS reference boards.
352 * The NMI debug exception entry point is 0xbfc00000, which
353 * normally is in the boot PROM, so the boot PROM must do a
354 * unconditional jump to this vector.
355 */
356NESTED(except_vec_nmi, 0, sp)
357 j nmi_handler
358 END(except_vec_nmi)
359
360 __FINIT
361
362NESTED(nmi_handler, PT_SIZE, sp)
363 .set push
364 .set noat
365 SAVE_ALL
366 move a0, sp
367 jal nmi_exception_handler
368 RESTORE_ALL
369 .set mips3
370 eret
371 .set pop
372 END(nmi_handler)
373
374 .macro __build_clear_none
375 .endm
376
377 .macro __build_clear_sti
378 TRACE_IRQS_ON
379 STI
380 .endm
381
382 .macro __build_clear_cli
383 CLI
384 TRACE_IRQS_OFF
385 .endm
386
387 .macro __build_clear_fpe
388 .set push
389 /* gas fails to assemble cfc1 for some archs (octeon).*/ \
390 .set mips1
391 cfc1 a1, fcr31
392 li a2, ~(0x3f << 12)
393 and a2, a1
394 ctc1 a2, fcr31
395 .set pop
396 TRACE_IRQS_ON
397 STI
398 .endm
399
400 .macro __build_clear_ade
401 MFC0 t0, CP0_BADVADDR
402 PTR_S t0, PT_BVADDR(sp)
403 KMODE
404 .endm
405
406 .macro __BUILD_silent exception
407 .endm
408
409 /* Gas tries to parse the PRINT argument as a string containing
410 string escapes and emits bogus warnings if it believes to
411 recognize an unknown escape code. So make the arguments
412 start with an n and gas will believe \n is ok ... */
413 .macro __BUILD_verbose nexception
414 LONG_L a1, PT_EPC(sp)
415#ifdef CONFIG_32BIT
416 PRINT("Got \nexception at %08lx\012")
417#endif
418#ifdef CONFIG_64BIT
419 PRINT("Got \nexception at %016lx\012")
420#endif
421 .endm
422
423 .macro __BUILD_count exception
424 LONG_L t0,exception_count_\exception
425 LONG_ADDIU t0, 1
426 LONG_S t0,exception_count_\exception
427 .comm exception_count\exception, 8, 8
428 .endm
429
430 .macro __BUILD_HANDLER exception handler clear verbose ext
431 .align 5
432 NESTED(handle_\exception, PT_SIZE, sp)
433 .set noat
434 SAVE_ALL
435 FEXPORT(handle_\exception\ext)
436 __BUILD_clear_\clear
437 .set at
438 __BUILD_\verbose \exception
439 move a0, sp
440 PTR_LA ra, ret_from_exception
441 j do_\handler
442 END(handle_\exception)
443 .endm
444
445 .macro BUILD_HANDLER exception handler clear verbose
446 __BUILD_HANDLER \exception \handler \clear \verbose _int
447 .endm
448
449 BUILD_HANDLER adel ade ade silent /* #4 */
450 BUILD_HANDLER ades ade ade silent /* #5 */
451 BUILD_HANDLER ibe be cli silent /* #6 */
452 BUILD_HANDLER dbe be cli silent /* #7 */
453 BUILD_HANDLER bp bp sti silent /* #9 */
454 BUILD_HANDLER ri ri sti silent /* #10 */
455 BUILD_HANDLER cpu cpu sti silent /* #11 */
456 BUILD_HANDLER ov ov sti silent /* #12 */
457 BUILD_HANDLER tr tr sti silent /* #13 */
458 BUILD_HANDLER fpe fpe fpe silent /* #15 */
459 BUILD_HANDLER mdmx mdmx sti silent /* #22 */
460#ifdef CONFIG_HARDWARE_WATCHPOINTS
461 /*
462 * For watch, interrupts will be enabled after the watch
463 * registers are read.
464 */
465 BUILD_HANDLER watch watch cli silent /* #23 */
466#else
467 BUILD_HANDLER watch watch sti verbose /* #23 */
468#endif
469 BUILD_HANDLER mcheck mcheck cli verbose /* #24 */
470 BUILD_HANDLER mt mt sti silent /* #25 */
471 BUILD_HANDLER dsp dsp sti silent /* #26 */
472 BUILD_HANDLER reserved reserved sti verbose /* others */
473
474 .align 5
475 LEAF(handle_ri_rdhwr_vivt)
476#ifdef CONFIG_MIPS_MT_SMTC
477 PANIC_PIC("handle_ri_rdhwr_vivt called")
478#else
479 .set push
480 .set noat
481 .set noreorder
482 /* check if TLB contains a entry for EPC */
483 MFC0 k1, CP0_ENTRYHI
484 andi k1, 0xff /* ASID_MASK */
485 MFC0 k0, CP0_EPC
486 PTR_SRL k0, PAGE_SHIFT + 1
487 PTR_SLL k0, PAGE_SHIFT + 1
488 or k1, k0
489 MTC0 k1, CP0_ENTRYHI
490 mtc0_tlbw_hazard
491 tlbp
492 tlb_probe_hazard
493 mfc0 k1, CP0_INDEX
494 .set pop
495 bltz k1, handle_ri /* slow path */
496 /* fall thru */
497#endif
498 END(handle_ri_rdhwr_vivt)
499
500 LEAF(handle_ri_rdhwr)
501 .set push
502 .set noat
503 .set noreorder
504 /* 0x7c03e83b: rdhwr v1,$29 */
505 MFC0 k1, CP0_EPC
506 lui k0, 0x7c03
507 lw k1, (k1)
508 ori k0, 0xe83b
509 .set reorder
510 bne k0, k1, handle_ri /* if not ours */
511 /* The insn is rdhwr. No need to check CAUSE.BD here. */
512 get_saved_sp /* k1 := current_thread_info */
513 .set noreorder
514 MFC0 k0, CP0_EPC
515#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
516 ori k1, _THREAD_MASK
517 xori k1, _THREAD_MASK
518 LONG_L v1, TI_TP_VALUE(k1)
519 LONG_ADDIU k0, 4
520 jr k0
521 rfe
522#else
523#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
524 LONG_ADDIU k0, 4 /* stall on $k0 */
525#else
526 .set at=v1
527 LONG_ADDIU k0, 4
528 .set noat
529#endif
530 MTC0 k0, CP0_EPC
531 /* I hope three instructions between MTC0 and ERET are enough... */
532 ori k1, _THREAD_MASK
533 xori k1, _THREAD_MASK
534 LONG_L v1, TI_TP_VALUE(k1)
535 .set mips3
536 eret
537 .set mips0
538#endif
539 .set pop
540 END(handle_ri_rdhwr)
541
542#ifdef CONFIG_64BIT
543/* A temporary overflow handler used by check_daddi(). */
544
545 __INIT
546
547 BUILD_HANDLER daddi_ov daddi_ov none silent /* #12 */
548#endif