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. | |
619b6e18 | 8 | * Copyright (C) 2002, 2007 Maciej W. Rozycki |
2a0b24f5 | 9 | * Copyright (C) 2001, 2012 MIPS Technologies, Inc. All rights reserved. |
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> | |
c65a5480 | 22 | #include <asm/thread_info.h> |
1da177e4 | 23 | |
1da177e4 LT |
24 | __INIT |
25 | ||
1da177e4 LT |
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 | */ | |
32 | NESTED(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 | |
875d43e7 | 40 | #ifdef CONFIG_64BIT |
1da177e4 LT |
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 | */ | |
54 | NESTED(except_vec3_r4000, 0, sp) | |
55 | .set push | |
a809d460 | 56 | .set arch=r4000 |
1da177e4 LT |
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 | |
875d43e7 | 67 | #ifdef CONFIG_64BIT |
69903d65 | 68 | dsll k1, k1, 1 |
1da177e4 LT |
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 | |
69903d65 | 76 | * physical address. We can safely invalidate the line pointed to by |
1da177e4 LT |
77 | * c0_badvaddr because after return from this exception handler the |
78 | * load / store will be re-executed. | |
79 | */ | |
80 | handle_vced: | |
69903d65 | 81 | MFC0 k0, CP0_BADVADDR |
1da177e4 LT |
82 | li k1, -4 # Is this ... |
83 | and k0, k1 # ... really needed? | |
84 | mtc0 zero, CP0_TAGLO | |
69903d65 TS |
85 | cache Index_Store_Tag_D, (k0) |
86 | cache Hit_Writeback_Inv_SD, (k0) | |
1da177e4 LT |
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 | ||
95 | handle_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 | ||
e4ac58af RB |
108 | __FINIT |
109 | ||
c65a5480 | 110 | .align 5 /* 32 byte rollback region */ |
087d990b | 111 | LEAF(__r4k_wait) |
c65a5480 AN |
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 | |
2a0b24f5 SH |
122 | #ifdef CONFIG_CPU_MICROMIPS |
123 | nop | |
124 | nop | |
125 | nop | |
126 | nop | |
127 | #endif | |
938c1282 | 128 | .set MIPS_ISA_ARCH_LEVEL_RAW |
c65a5480 AN |
129 | wait |
130 | /* end of rollback region (the region size must be power of two) */ | |
c65a5480 AN |
131 | 1: |
132 | jr ra | |
105c22c5 | 133 | nop |
2a0b24f5 | 134 | .set pop |
087d990b | 135 | END(__r4k_wait) |
c65a5480 AN |
136 | |
137 | .macro BUILD_ROLLBACK_PROLOGUE handler | |
138 | FEXPORT(rollback_\handler) | |
139 | .set push | |
140 | .set noat | |
141 | MFC0 k0, CP0_EPC | |
087d990b | 142 | PTR_LA k1, __r4k_wait |
c65a5480 AN |
143 | ori k0, 0x1f /* 32 byte rollback region */ |
144 | xori k0, 0x1f | |
1eefcbc8 | 145 | bne k0, k1, \handler |
c65a5480 | 146 | MTC0 k0, CP0_EPC |
c65a5480 AN |
147 | .set pop |
148 | .endm | |
149 | ||
70342287 | 150 | .align 5 |
c65a5480 | 151 | BUILD_ROLLBACK_PROLOGUE handle_int |
e4ac58af | 152 | NESTED(handle_int, PT_SIZE, sp) |
fe99f1b1 CD |
153 | #ifdef CONFIG_TRACE_IRQFLAGS |
154 | /* | |
155 | * Check to see if the interrupted code has just disabled | |
156 | * interrupts and ignore this interrupt for now if so. | |
157 | * | |
158 | * local_irq_disable() disables interrupts and then calls | |
159 | * trace_hardirqs_off() to track the state. If an interrupt is taken | |
160 | * after interrupts are disabled but before the state is updated | |
161 | * it will appear to restore_all that it is incorrectly returning with | |
162 | * interrupts disabled | |
163 | */ | |
164 | .set push | |
165 | .set noat | |
166 | mfc0 k0, CP0_STATUS | |
167 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
168 | and k0, ST0_IEP | |
169 | bnez k0, 1f | |
170 | ||
c6563e85 | 171 | mfc0 k0, CP0_EPC |
fe99f1b1 CD |
172 | .set noreorder |
173 | j k0 | |
105c22c5 | 174 | rfe |
fe99f1b1 CD |
175 | #else |
176 | and k0, ST0_IE | |
177 | bnez k0, 1f | |
178 | ||
179 | eret | |
180 | #endif | |
181 | 1: | |
182 | .set pop | |
183 | #endif | |
e4ac58af RB |
184 | SAVE_ALL |
185 | CLI | |
192ef366 | 186 | TRACE_IRQS_OFF |
e4ac58af | 187 | |
937a8015 RB |
188 | LONG_L s0, TI_REGS($28) |
189 | LONG_S sp, TI_REGS($28) | |
f431baa5 | 190 | PTR_LA ra, ret_from_irq |
105c22c5 | 191 | PTR_LA v0, plat_irq_dispatch |
2a0b24f5 SH |
192 | jr v0 |
193 | #ifdef CONFIG_CPU_MICROMIPS | |
194 | nop | |
195 | #endif | |
e4ac58af RB |
196 | END(handle_int) |
197 | ||
198 | __INIT | |
199 | ||
1da177e4 LT |
200 | /* |
201 | * Special interrupt vector for MIPS64 ISA & embedded MIPS processors. | |
202 | * This is a dedicated interrupt exception vector which reduces the | |
203 | * interrupt processing overhead. The jump instruction will be replaced | |
204 | * at the initialization time. | |
205 | * | |
206 | * Be careful when changing this, it has to be at most 128 bytes | |
207 | * to fit into space reserved for the exception handler. | |
208 | */ | |
209 | NESTED(except_vec4, 0, sp) | |
210 | 1: j 1b /* Dummy, will be replaced */ | |
211 | END(except_vec4) | |
212 | ||
213 | /* | |
214 | * EJTAG debug exception handler. | |
215 | * The EJTAG debug exception entry point is 0xbfc00480, which | |
2a0b24f5 | 216 | * normally is in the boot PROM, so the boot PROM must do an |
1da177e4 LT |
217 | * unconditional jump to this vector. |
218 | */ | |
219 | NESTED(except_vec_ejtag_debug, 0, sp) | |
220 | j ejtag_debug_handler | |
2a0b24f5 SH |
221 | #ifdef CONFIG_CPU_MICROMIPS |
222 | nop | |
223 | #endif | |
1da177e4 LT |
224 | END(except_vec_ejtag_debug) |
225 | ||
226 | __FINIT | |
227 | ||
e01402b1 RB |
228 | /* |
229 | * Vectored interrupt handler. | |
230 | * This prototype is copied to ebase + n*IntCtl.VS and patched | |
231 | * to invoke the handler | |
232 | */ | |
c65a5480 | 233 | BUILD_ROLLBACK_PROLOGUE except_vec_vi |
e01402b1 RB |
234 | NESTED(except_vec_vi, 0, sp) |
235 | SAVE_SOME | |
236 | SAVE_AT | |
237 | .set push | |
238 | .set noreorder | |
2a0b24f5 | 239 | PTR_LA v1, except_vec_vi_handler |
7df42461 | 240 | FEXPORT(except_vec_vi_lui) |
e01402b1 | 241 | lui v0, 0 /* Patched */ |
2a0b24f5 | 242 | jr v1 |
7df42461 | 243 | FEXPORT(except_vec_vi_ori) |
e01402b1 RB |
244 | ori v0, 0 /* Patched */ |
245 | .set pop | |
246 | END(except_vec_vi) | |
247 | EXPORT(except_vec_vi_end) | |
248 | ||
249 | /* | |
250 | * Common Vectored Interrupt code | |
251 | * Complete the register saves and invoke the handler which is passed in $v0 | |
252 | */ | |
253 | NESTED(except_vec_vi_handler, 0, sp) | |
254 | SAVE_TEMP | |
255 | SAVE_STATIC | |
256 | CLI | |
8c364435 RB |
257 | #ifdef CONFIG_TRACE_IRQFLAGS |
258 | move s0, v0 | |
192ef366 | 259 | TRACE_IRQS_OFF |
8c364435 RB |
260 | move v0, s0 |
261 | #endif | |
937a8015 RB |
262 | |
263 | LONG_L s0, TI_REGS($28) | |
264 | LONG_S sp, TI_REGS($28) | |
23126692 | 265 | PTR_LA ra, ret_from_irq |
f431baa5 | 266 | jr v0 |
e01402b1 RB |
267 | END(except_vec_vi_handler) |
268 | ||
1da177e4 LT |
269 | /* |
270 | * EJTAG debug exception handler. | |
271 | */ | |
272 | NESTED(ejtag_debug_handler, PT_SIZE, sp) | |
273 | .set push | |
274 | .set noat | |
275 | MTC0 k0, CP0_DESAVE | |
276 | mfc0 k0, CP0_DEBUG | |
277 | ||
278 | sll k0, k0, 30 # Check for SDBBP. | |
279 | bgez k0, ejtag_return | |
280 | ||
281 | PTR_LA k0, ejtag_debug_buffer | |
282 | LONG_S k1, 0(k0) | |
283 | SAVE_ALL | |
284 | move a0, sp | |
285 | jal ejtag_exception_handler | |
286 | RESTORE_ALL | |
287 | PTR_LA k0, ejtag_debug_buffer | |
288 | LONG_L k1, 0(k0) | |
289 | ||
290 | ejtag_return: | |
291 | MFC0 k0, CP0_DESAVE | |
292 | .set mips32 | |
293 | deret | |
105c22c5 | 294 | .set pop |
1da177e4 LT |
295 | END(ejtag_debug_handler) |
296 | ||
297 | /* | |
298 | * This buffer is reserved for the use of the EJTAG debug | |
299 | * handler. | |
300 | */ | |
301 | .data | |
302 | EXPORT(ejtag_debug_buffer) | |
303 | .fill LONGSIZE | |
304 | .previous | |
305 | ||
306 | __INIT | |
307 | ||
308 | /* | |
309 | * NMI debug exception handler for MIPS reference boards. | |
310 | * The NMI debug exception entry point is 0xbfc00000, which | |
311 | * normally is in the boot PROM, so the boot PROM must do a | |
312 | * unconditional jump to this vector. | |
313 | */ | |
314 | NESTED(except_vec_nmi, 0, sp) | |
315 | j nmi_handler | |
2a0b24f5 SH |
316 | #ifdef CONFIG_CPU_MICROMIPS |
317 | nop | |
318 | #endif | |
1da177e4 LT |
319 | END(except_vec_nmi) |
320 | ||
321 | __FINIT | |
322 | ||
323 | NESTED(nmi_handler, PT_SIZE, sp) | |
324 | .set push | |
325 | .set noat | |
83e4da1e LY |
326 | /* |
327 | * Clear ERL - restore segment mapping | |
328 | * Clear BEV - required for page fault exception handler to work | |
329 | */ | |
330 | mfc0 k0, CP0_STATUS | |
105c22c5 | 331 | ori k0, k0, ST0_EXL |
83e4da1e | 332 | li k1, ~(ST0_BEV | ST0_ERL) |
105c22c5 JH |
333 | and k0, k0, k1 |
334 | mtc0 k0, CP0_STATUS | |
83e4da1e | 335 | _ehb |
1da177e4 | 336 | SAVE_ALL |
70342287 | 337 | move a0, sp |
1da177e4 | 338 | jal nmi_exception_handler |
83e4da1e | 339 | /* nmi_exception_handler never returns */ |
1da177e4 LT |
340 | .set pop |
341 | END(nmi_handler) | |
342 | ||
343 | .macro __build_clear_none | |
344 | .endm | |
345 | ||
346 | .macro __build_clear_sti | |
192ef366 | 347 | TRACE_IRQS_ON |
1da177e4 LT |
348 | STI |
349 | .endm | |
350 | ||
351 | .macro __build_clear_cli | |
352 | CLI | |
192ef366 | 353 | TRACE_IRQS_OFF |
1da177e4 LT |
354 | .endm |
355 | ||
356 | .macro __build_clear_fpe | |
25c30003 DD |
357 | .set push |
358 | /* gas fails to assemble cfc1 for some archs (octeon).*/ \ | |
359 | .set mips1 | |
842dfc11 | 360 | SET_HARDFLOAT |
1da177e4 | 361 | cfc1 a1, fcr31 |
25c30003 | 362 | .set pop |
64bedffe JH |
363 | CLI |
364 | TRACE_IRQS_OFF | |
1da177e4 LT |
365 | .endm |
366 | ||
091be550 PB |
367 | .macro __build_clear_msa_fpe |
368 | _cfcmsa a1, MSA_CSR | |
64bedffe JH |
369 | CLI |
370 | TRACE_IRQS_OFF | |
091be550 PB |
371 | .endm |
372 | ||
1da177e4 LT |
373 | .macro __build_clear_ade |
374 | MFC0 t0, CP0_BADVADDR | |
375 | PTR_S t0, PT_BVADDR(sp) | |
376 | KMODE | |
377 | .endm | |
378 | ||
379 | .macro __BUILD_silent exception | |
380 | .endm | |
381 | ||
382 | /* Gas tries to parse the PRINT argument as a string containing | |
383 | string escapes and emits bogus warnings if it believes to | |
384 | recognize an unknown escape code. So make the arguments | |
385 | start with an n and gas will believe \n is ok ... */ | |
70342287 | 386 | .macro __BUILD_verbose nexception |
1da177e4 | 387 | LONG_L a1, PT_EPC(sp) |
766160c2 | 388 | #ifdef CONFIG_32BIT |
1da177e4 | 389 | PRINT("Got \nexception at %08lx\012") |
42a3b4f2 | 390 | #endif |
766160c2 | 391 | #ifdef CONFIG_64BIT |
1da177e4 | 392 | PRINT("Got \nexception at %016lx\012") |
42a3b4f2 | 393 | #endif |
1da177e4 LT |
394 | .endm |
395 | ||
396 | .macro __BUILD_count exception | |
397 | LONG_L t0,exception_count_\exception | |
105c22c5 | 398 | LONG_ADDIU t0, 1 |
1da177e4 LT |
399 | LONG_S t0,exception_count_\exception |
400 | .comm exception_count\exception, 8, 8 | |
401 | .endm | |
402 | ||
403 | .macro __BUILD_HANDLER exception handler clear verbose ext | |
404 | .align 5 | |
405 | NESTED(handle_\exception, PT_SIZE, sp) | |
406 | .set noat | |
407 | SAVE_ALL | |
408 | FEXPORT(handle_\exception\ext) | |
158d3b2a | 409 | __build_clear_\clear |
1da177e4 LT |
410 | .set at |
411 | __BUILD_\verbose \exception | |
412 | move a0, sp | |
23126692 AN |
413 | PTR_LA ra, ret_from_exception |
414 | j do_\handler | |
1da177e4 LT |
415 | END(handle_\exception) |
416 | .endm | |
417 | ||
418 | .macro BUILD_HANDLER exception handler clear verbose | |
70342287 | 419 | __BUILD_HANDLER \exception \handler \clear \verbose _int |
1da177e4 LT |
420 | .endm |
421 | ||
422 | BUILD_HANDLER adel ade ade silent /* #4 */ | |
423 | BUILD_HANDLER ades ade ade silent /* #5 */ | |
424 | BUILD_HANDLER ibe be cli silent /* #6 */ | |
425 | BUILD_HANDLER dbe be cli silent /* #7 */ | |
426 | BUILD_HANDLER bp bp sti silent /* #9 */ | |
427 | BUILD_HANDLER ri ri sti silent /* #10 */ | |
428 | BUILD_HANDLER cpu cpu sti silent /* #11 */ | |
429 | BUILD_HANDLER ov ov sti silent /* #12 */ | |
430 | BUILD_HANDLER tr tr sti silent /* #13 */ | |
091be550 | 431 | BUILD_HANDLER msa_fpe msa_fpe msa_fpe silent /* #14 */ |
1da177e4 | 432 | BUILD_HANDLER fpe fpe fpe silent /* #15 */ |
75b5b5e0 | 433 | BUILD_HANDLER ftlb ftlb none silent /* #16 */ |
1db1af84 | 434 | BUILD_HANDLER msa msa sti silent /* #21 */ |
1da177e4 | 435 | BUILD_HANDLER mdmx mdmx sti silent /* #22 */ |
70342287 | 436 | #ifdef CONFIG_HARDWARE_WATCHPOINTS |
8bc6d05b DD |
437 | /* |
438 | * For watch, interrupts will be enabled after the watch | |
439 | * registers are read. | |
440 | */ | |
441 | BUILD_HANDLER watch watch cli silent /* #23 */ | |
b67b2b70 | 442 | #else |
1da177e4 | 443 | BUILD_HANDLER watch watch sti verbose /* #23 */ |
b67b2b70 | 444 | #endif |
1da177e4 | 445 | BUILD_HANDLER mcheck mcheck cli verbose /* #24 */ |
e35a5e35 | 446 | BUILD_HANDLER mt mt sti silent /* #25 */ |
e50c0a8f | 447 | BUILD_HANDLER dsp dsp sti silent /* #26 */ |
1da177e4 LT |
448 | BUILD_HANDLER reserved reserved sti verbose /* others */ |
449 | ||
5b10496b AN |
450 | .align 5 |
451 | LEAF(handle_ri_rdhwr_vivt) | |
5b10496b AN |
452 | .set push |
453 | .set noat | |
454 | .set noreorder | |
455 | /* check if TLB contains a entry for EPC */ | |
456 | MFC0 k1, CP0_ENTRYHI | |
2db003a5 | 457 | andi k1, MIPS_ENTRYHI_ASID | MIPS_ENTRYHI_ASIDX |
5b10496b | 458 | MFC0 k0, CP0_EPC |
105c22c5 JH |
459 | PTR_SRL k0, _PAGE_SHIFT + 1 |
460 | PTR_SLL k0, _PAGE_SHIFT + 1 | |
5b10496b AN |
461 | or k1, k0 |
462 | MTC0 k1, CP0_ENTRYHI | |
463 | mtc0_tlbw_hazard | |
464 | tlbp | |
465 | tlb_probe_hazard | |
466 | mfc0 k1, CP0_INDEX | |
467 | .set pop | |
468 | bltz k1, handle_ri /* slow path */ | |
469 | /* fall thru */ | |
5b10496b AN |
470 | END(handle_ri_rdhwr_vivt) |
471 | ||
472 | LEAF(handle_ri_rdhwr) | |
473 | .set push | |
474 | .set noat | |
475 | .set noreorder | |
2a0b24f5 SH |
476 | /* MIPS32: 0x7c03e83b: rdhwr v1,$29 */ |
477 | /* microMIPS: 0x007d6b3c: rdhwr v1,$29 */ | |
5b10496b | 478 | MFC0 k1, CP0_EPC |
2a0b24f5 | 479 | #if defined(CONFIG_CPU_MICROMIPS) || defined(CONFIG_CPU_MIPS32_R2) || defined(CONFIG_CPU_MIPS64_R2) |
105c22c5 JH |
480 | and k0, k1, 1 |
481 | beqz k0, 1f | |
482 | xor k1, k0 | |
483 | lhu k0, (k1) | |
484 | lhu k1, 2(k1) | |
485 | ins k1, k0, 16, 16 | |
486 | lui k0, 0x007d | |
487 | b docheck | |
488 | ori k0, 0x6b3c | |
2a0b24f5 | 489 | 1: |
105c22c5 JH |
490 | lui k0, 0x7c03 |
491 | lw k1, (k1) | |
492 | ori k0, 0xe83b | |
2a0b24f5 | 493 | #else |
105c22c5 JH |
494 | andi k0, k1, 1 |
495 | bnez k0, handle_ri | |
496 | lui k0, 0x7c03 | |
497 | lw k1, (k1) | |
498 | ori k0, 0xe83b | |
2a0b24f5 | 499 | #endif |
105c22c5 | 500 | .set reorder |
2a0b24f5 | 501 | docheck: |
5b10496b | 502 | bne k0, k1, handle_ri /* if not ours */ |
2a0b24f5 SH |
503 | |
504 | isrdhwr: | |
5b10496b AN |
505 | /* The insn is rdhwr. No need to check CAUSE.BD here. */ |
506 | get_saved_sp /* k1 := current_thread_info */ | |
507 | .set noreorder | |
508 | MFC0 k0, CP0_EPC | |
509 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
510 | ori k1, _THREAD_MASK | |
511 | xori k1, _THREAD_MASK | |
512 | LONG_L v1, TI_TP_VALUE(k1) | |
513 | LONG_ADDIU k0, 4 | |
514 | jr k0 | |
515 | rfe | |
516 | #else | |
619b6e18 | 517 | #ifndef CONFIG_CPU_DADDI_WORKAROUNDS |
5b10496b | 518 | LONG_ADDIU k0, 4 /* stall on $k0 */ |
619b6e18 MR |
519 | #else |
520 | .set at=v1 | |
521 | LONG_ADDIU k0, 4 | |
522 | .set noat | |
523 | #endif | |
5b10496b AN |
524 | MTC0 k0, CP0_EPC |
525 | /* I hope three instructions between MTC0 and ERET are enough... */ | |
526 | ori k1, _THREAD_MASK | |
527 | xori k1, _THREAD_MASK | |
528 | LONG_L v1, TI_TP_VALUE(k1) | |
a809d460 | 529 | .set arch=r4000 |
5b10496b AN |
530 | eret |
531 | .set mips0 | |
532 | #endif | |
533 | .set pop | |
534 | END(handle_ri_rdhwr) | |
535 | ||
875d43e7 | 536 | #ifdef CONFIG_64BIT |
1da177e4 LT |
537 | /* A temporary overflow handler used by check_daddi(). */ |
538 | ||
539 | __INIT | |
540 | ||
541 | BUILD_HANDLER daddi_ov daddi_ov none silent /* #12 */ | |
542 | #endif |