Commit | Line | Data |
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1da177e4 LT |
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. | |
619b6e18 | 9 | * Copyright (C) 2002, 2007 Maciej W. Rozycki |
1da177e4 | 10 | */ |
1da177e4 LT |
11 | #include <linux/init.h> |
12 | ||
13 | #include <asm/asm.h> | |
41c594ab | 14 | #include <asm/asmmacro.h> |
1da177e4 | 15 | #include <asm/cacheops.h> |
192ef366 | 16 | #include <asm/irqflags.h> |
1da177e4 LT |
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> | |
5b10496b | 22 | #include <asm/page.h> |
c65a5480 | 23 | #include <asm/thread_info.h> |
1da177e4 LT |
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; \ | |
32 | 9: b 9b; \ | |
33 | .set pop; \ | |
34 | TEXT(msg) | |
35 | ||
36 | __INIT | |
37 | ||
38 | NESTED(except_vec0_generic, 0, sp) | |
39 | PANIC_PIC("Exception vector 0 called") | |
40 | END(except_vec0_generic) | |
41 | ||
42 | NESTED(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 | */ | |
52 | NESTED(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 | |
875d43e7 | 60 | #ifdef CONFIG_64BIT |
1da177e4 LT |
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 | */ | |
74 | NESTED(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 | |
875d43e7 | 87 | #ifdef CONFIG_64BIT |
69903d65 | 88 | dsll k1, k1, 1 |
1da177e4 LT |
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 | |
69903d65 | 96 | * physical address. We can safely invalidate the line pointed to by |
1da177e4 LT |
97 | * c0_badvaddr because after return from this exception handler the |
98 | * load / store will be re-executed. | |
99 | */ | |
100 | handle_vced: | |
69903d65 | 101 | MFC0 k0, CP0_BADVADDR |
1da177e4 LT |
102 | li k1, -4 # Is this ... |
103 | and k0, k1 # ... really needed? | |
104 | mtc0 zero, CP0_TAGLO | |
69903d65 TS |
105 | cache Index_Store_Tag_D, (k0) |
106 | cache Hit_Writeback_Inv_SD, (k0) | |
1da177e4 LT |
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 | ||
115 | handle_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 | ||
e4ac58af RB |
128 | __FINIT |
129 | ||
c65a5480 AN |
130 | .align 5 /* 32 byte rollback region */ |
131 | LEAF(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 | |
146 | 1: | |
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 | |
160 | 9: | |
161 | .set pop | |
162 | .endm | |
163 | ||
e4ac58af | 164 | .align 5 |
c65a5480 | 165 | BUILD_ROLLBACK_PROLOGUE handle_int |
e4ac58af | 166 | NESTED(handle_int, PT_SIZE, sp) |
fe99f1b1 CD |
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 | ||
c6563e85 | 185 | mfc0 k0, CP0_EPC |
fe99f1b1 CD |
186 | .set noreorder |
187 | j k0 | |
188 | rfe | |
189 | #else | |
190 | and k0, ST0_IE | |
191 | bnez k0, 1f | |
192 | ||
193 | eret | |
194 | #endif | |
195 | 1: | |
196 | .set pop | |
197 | #endif | |
e4ac58af RB |
198 | SAVE_ALL |
199 | CLI | |
192ef366 | 200 | TRACE_IRQS_OFF |
e4ac58af | 201 | |
937a8015 RB |
202 | LONG_L s0, TI_REGS($28) |
203 | LONG_S sp, TI_REGS($28) | |
f431baa5 AN |
204 | PTR_LA ra, ret_from_irq |
205 | j plat_irq_dispatch | |
e4ac58af RB |
206 | END(handle_int) |
207 | ||
208 | __INIT | |
209 | ||
1da177e4 LT |
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 | */ | |
219 | NESTED(except_vec4, 0, sp) | |
220 | 1: 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 | */ | |
229 | NESTED(except_vec_ejtag_debug, 0, sp) | |
230 | j ejtag_debug_handler | |
231 | END(except_vec_ejtag_debug) | |
232 | ||
233 | __FINIT | |
234 | ||
e01402b1 RB |
235 | /* |
236 | * Vectored interrupt handler. | |
237 | * This prototype is copied to ebase + n*IntCtl.VS and patched | |
238 | * to invoke the handler | |
239 | */ | |
c65a5480 | 240 | BUILD_ROLLBACK_PROLOGUE except_vec_vi |
e01402b1 RB |
241 | NESTED(except_vec_vi, 0, sp) |
242 | SAVE_SOME | |
243 | SAVE_AT | |
244 | .set push | |
245 | .set noreorder | |
41c594ab RB |
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 | */ | |
7df42461 | 252 | FEXPORT(except_vec_vi_mori) |
41c594ab RB |
253 | ori a0, $0, 0 |
254 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
7df42461 | 255 | FEXPORT(except_vec_vi_lui) |
e01402b1 RB |
256 | lui v0, 0 /* Patched */ |
257 | j except_vec_vi_handler | |
7df42461 | 258 | FEXPORT(except_vec_vi_ori) |
e01402b1 RB |
259 | ori v0, 0 /* Patched */ |
260 | .set pop | |
261 | END(except_vec_vi) | |
262 | EXPORT(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 | */ | |
268 | NESTED(except_vec_vi_handler, 0, sp) | |
269 | SAVE_TEMP | |
270 | SAVE_STATIC | |
41c594ab RB |
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 | |
0db34215 | 283 | #ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP |
41c594ab | 284 | mfc0 t2, CP0_TCCONTEXT |
8531a35e KK |
285 | or t2, t0, t2 |
286 | mtc0 t2, CP0_TCCONTEXT | |
0db34215 | 287 | #endif /* CONFIG_MIPS_MT_SMTC_IM_BACKSTOP */ |
41c594ab RB |
288 | xor t1, t1, t0 |
289 | mtc0 t1, CP0_STATUS | |
4277ff5e | 290 | _ehb |
41c594ab | 291 | #endif /* CONFIG_MIPS_MT_SMTC */ |
e01402b1 | 292 | CLI |
8c364435 RB |
293 | #ifdef CONFIG_TRACE_IRQFLAGS |
294 | move s0, v0 | |
295 | #ifdef CONFIG_MIPS_MT_SMTC | |
296 | move s1, a0 | |
297 | #endif | |
192ef366 | 298 | TRACE_IRQS_OFF |
8c364435 RB |
299 | #ifdef CONFIG_MIPS_MT_SMTC |
300 | move a0, s1 | |
301 | #endif | |
302 | move v0, s0 | |
303 | #endif | |
937a8015 RB |
304 | |
305 | LONG_L s0, TI_REGS($28) | |
306 | LONG_S sp, TI_REGS($28) | |
23126692 | 307 | PTR_LA ra, ret_from_irq |
f431baa5 | 308 | jr v0 |
e01402b1 RB |
309 | END(except_vec_vi_handler) |
310 | ||
1da177e4 LT |
311 | /* |
312 | * EJTAG debug exception handler. | |
313 | */ | |
314 | NESTED(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 | ||
332 | ejtag_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 | |
344 | EXPORT(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 | */ | |
356 | NESTED(except_vec_nmi, 0, sp) | |
357 | j nmi_handler | |
358 | END(except_vec_nmi) | |
359 | ||
360 | __FINIT | |
361 | ||
362 | NESTED(nmi_handler, PT_SIZE, sp) | |
363 | .set push | |
364 | .set noat | |
1da177e4 LT |
365 | SAVE_ALL |
366 | move a0, sp | |
367 | jal nmi_exception_handler | |
368 | RESTORE_ALL | |
4f0638ba | 369 | .set mips3 |
1da177e4 LT |
370 | eret |
371 | .set pop | |
372 | END(nmi_handler) | |
373 | ||
374 | .macro __build_clear_none | |
375 | .endm | |
376 | ||
377 | .macro __build_clear_sti | |
192ef366 | 378 | TRACE_IRQS_ON |
1da177e4 LT |
379 | STI |
380 | .endm | |
381 | ||
382 | .macro __build_clear_cli | |
383 | CLI | |
192ef366 | 384 | TRACE_IRQS_OFF |
1da177e4 LT |
385 | .endm |
386 | ||
387 | .macro __build_clear_fpe | |
388 | cfc1 a1, fcr31 | |
389 | li a2, ~(0x3f << 12) | |
390 | and a2, a1 | |
391 | ctc1 a2, fcr31 | |
192ef366 | 392 | TRACE_IRQS_ON |
1da177e4 LT |
393 | STI |
394 | .endm | |
395 | ||
396 | .macro __build_clear_ade | |
397 | MFC0 t0, CP0_BADVADDR | |
398 | PTR_S t0, PT_BVADDR(sp) | |
399 | KMODE | |
400 | .endm | |
401 | ||
402 | .macro __BUILD_silent exception | |
403 | .endm | |
404 | ||
405 | /* Gas tries to parse the PRINT argument as a string containing | |
406 | string escapes and emits bogus warnings if it believes to | |
407 | recognize an unknown escape code. So make the arguments | |
408 | start with an n and gas will believe \n is ok ... */ | |
409 | .macro __BUILD_verbose nexception | |
410 | LONG_L a1, PT_EPC(sp) | |
766160c2 | 411 | #ifdef CONFIG_32BIT |
1da177e4 | 412 | PRINT("Got \nexception at %08lx\012") |
42a3b4f2 | 413 | #endif |
766160c2 | 414 | #ifdef CONFIG_64BIT |
1da177e4 | 415 | PRINT("Got \nexception at %016lx\012") |
42a3b4f2 | 416 | #endif |
1da177e4 LT |
417 | .endm |
418 | ||
419 | .macro __BUILD_count exception | |
420 | LONG_L t0,exception_count_\exception | |
421 | LONG_ADDIU t0, 1 | |
422 | LONG_S t0,exception_count_\exception | |
423 | .comm exception_count\exception, 8, 8 | |
424 | .endm | |
425 | ||
426 | .macro __BUILD_HANDLER exception handler clear verbose ext | |
427 | .align 5 | |
428 | NESTED(handle_\exception, PT_SIZE, sp) | |
429 | .set noat | |
430 | SAVE_ALL | |
431 | FEXPORT(handle_\exception\ext) | |
432 | __BUILD_clear_\clear | |
433 | .set at | |
434 | __BUILD_\verbose \exception | |
435 | move a0, sp | |
23126692 AN |
436 | PTR_LA ra, ret_from_exception |
437 | j do_\handler | |
1da177e4 LT |
438 | END(handle_\exception) |
439 | .endm | |
440 | ||
441 | .macro BUILD_HANDLER exception handler clear verbose | |
442 | __BUILD_HANDLER \exception \handler \clear \verbose _int | |
443 | .endm | |
444 | ||
445 | BUILD_HANDLER adel ade ade silent /* #4 */ | |
446 | BUILD_HANDLER ades ade ade silent /* #5 */ | |
447 | BUILD_HANDLER ibe be cli silent /* #6 */ | |
448 | BUILD_HANDLER dbe be cli silent /* #7 */ | |
449 | BUILD_HANDLER bp bp sti silent /* #9 */ | |
450 | BUILD_HANDLER ri ri sti silent /* #10 */ | |
451 | BUILD_HANDLER cpu cpu sti silent /* #11 */ | |
452 | BUILD_HANDLER ov ov sti silent /* #12 */ | |
453 | BUILD_HANDLER tr tr sti silent /* #13 */ | |
454 | BUILD_HANDLER fpe fpe fpe silent /* #15 */ | |
455 | BUILD_HANDLER mdmx mdmx sti silent /* #22 */ | |
456 | BUILD_HANDLER watch watch sti verbose /* #23 */ | |
457 | BUILD_HANDLER mcheck mcheck cli verbose /* #24 */ | |
e35a5e35 | 458 | BUILD_HANDLER mt mt sti silent /* #25 */ |
e50c0a8f | 459 | BUILD_HANDLER dsp dsp sti silent /* #26 */ |
1da177e4 LT |
460 | BUILD_HANDLER reserved reserved sti verbose /* others */ |
461 | ||
5b10496b AN |
462 | .align 5 |
463 | LEAF(handle_ri_rdhwr_vivt) | |
464 | #ifdef CONFIG_MIPS_MT_SMTC | |
465 | PANIC_PIC("handle_ri_rdhwr_vivt called") | |
466 | #else | |
467 | .set push | |
468 | .set noat | |
469 | .set noreorder | |
470 | /* check if TLB contains a entry for EPC */ | |
471 | MFC0 k1, CP0_ENTRYHI | |
472 | andi k1, 0xff /* ASID_MASK */ | |
473 | MFC0 k0, CP0_EPC | |
474 | PTR_SRL k0, PAGE_SHIFT + 1 | |
475 | PTR_SLL k0, PAGE_SHIFT + 1 | |
476 | or k1, k0 | |
477 | MTC0 k1, CP0_ENTRYHI | |
478 | mtc0_tlbw_hazard | |
479 | tlbp | |
480 | tlb_probe_hazard | |
481 | mfc0 k1, CP0_INDEX | |
482 | .set pop | |
483 | bltz k1, handle_ri /* slow path */ | |
484 | /* fall thru */ | |
485 | #endif | |
486 | END(handle_ri_rdhwr_vivt) | |
487 | ||
488 | LEAF(handle_ri_rdhwr) | |
489 | .set push | |
490 | .set noat | |
491 | .set noreorder | |
492 | /* 0x7c03e83b: rdhwr v1,$29 */ | |
493 | MFC0 k1, CP0_EPC | |
494 | lui k0, 0x7c03 | |
495 | lw k1, (k1) | |
496 | ori k0, 0xe83b | |
497 | .set reorder | |
498 | bne k0, k1, handle_ri /* if not ours */ | |
499 | /* The insn is rdhwr. No need to check CAUSE.BD here. */ | |
500 | get_saved_sp /* k1 := current_thread_info */ | |
501 | .set noreorder | |
502 | MFC0 k0, CP0_EPC | |
503 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
504 | ori k1, _THREAD_MASK | |
505 | xori k1, _THREAD_MASK | |
506 | LONG_L v1, TI_TP_VALUE(k1) | |
507 | LONG_ADDIU k0, 4 | |
508 | jr k0 | |
509 | rfe | |
510 | #else | |
619b6e18 | 511 | #ifndef CONFIG_CPU_DADDI_WORKAROUNDS |
5b10496b | 512 | LONG_ADDIU k0, 4 /* stall on $k0 */ |
619b6e18 MR |
513 | #else |
514 | .set at=v1 | |
515 | LONG_ADDIU k0, 4 | |
516 | .set noat | |
517 | #endif | |
5b10496b AN |
518 | MTC0 k0, CP0_EPC |
519 | /* I hope three instructions between MTC0 and ERET are enough... */ | |
520 | ori k1, _THREAD_MASK | |
521 | xori k1, _THREAD_MASK | |
522 | LONG_L v1, TI_TP_VALUE(k1) | |
523 | .set mips3 | |
524 | eret | |
525 | .set mips0 | |
526 | #endif | |
527 | .set pop | |
528 | END(handle_ri_rdhwr) | |
529 | ||
875d43e7 | 530 | #ifdef CONFIG_64BIT |
1da177e4 LT |
531 | /* A temporary overflow handler used by check_daddi(). */ |
532 | ||
533 | __INIT | |
534 | ||
535 | BUILD_HANDLER daddi_ov daddi_ov none silent /* #12 */ | |
536 | #endif |