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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. | |
9 | * Copyright (C) 2002 Maciej W. Rozycki | |
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> |
1da177e4 LT |
23 | |
24 | #define PANIC_PIC(msg) \ | |
25 | .set push; \ | |
26 | .set reorder; \ | |
27 | PTR_LA a0,8f; \ | |
28 | .set noat; \ | |
29 | PTR_LA AT, panic; \ | |
30 | jr AT; \ | |
31 | 9: b 9b; \ | |
32 | .set pop; \ | |
33 | TEXT(msg) | |
34 | ||
35 | __INIT | |
36 | ||
37 | NESTED(except_vec0_generic, 0, sp) | |
38 | PANIC_PIC("Exception vector 0 called") | |
39 | END(except_vec0_generic) | |
40 | ||
41 | NESTED(except_vec1_generic, 0, sp) | |
42 | PANIC_PIC("Exception vector 1 called") | |
43 | END(except_vec1_generic) | |
44 | ||
45 | /* | |
46 | * General exception vector for all other CPUs. | |
47 | * | |
48 | * Be careful when changing this, it has to be at most 128 bytes | |
49 | * to fit into space reserved for the exception handler. | |
50 | */ | |
51 | NESTED(except_vec3_generic, 0, sp) | |
52 | .set push | |
53 | .set noat | |
54 | #if R5432_CP0_INTERRUPT_WAR | |
55 | mfc0 k0, CP0_INDEX | |
56 | #endif | |
57 | mfc0 k1, CP0_CAUSE | |
58 | andi k1, k1, 0x7c | |
875d43e7 | 59 | #ifdef CONFIG_64BIT |
1da177e4 LT |
60 | dsll k1, k1, 1 |
61 | #endif | |
62 | PTR_L k0, exception_handlers(k1) | |
63 | jr k0 | |
64 | .set pop | |
65 | END(except_vec3_generic) | |
66 | ||
67 | /* | |
68 | * General exception handler for CPUs with virtual coherency exception. | |
69 | * | |
70 | * Be careful when changing this, it has to be at most 256 (as a special | |
71 | * exception) bytes to fit into space reserved for the exception handler. | |
72 | */ | |
73 | NESTED(except_vec3_r4000, 0, sp) | |
74 | .set push | |
75 | .set mips3 | |
76 | .set noat | |
77 | mfc0 k1, CP0_CAUSE | |
78 | li k0, 31<<2 | |
79 | andi k1, k1, 0x7c | |
80 | .set push | |
81 | .set noreorder | |
82 | .set nomacro | |
83 | beq k1, k0, handle_vced | |
84 | li k0, 14<<2 | |
85 | beq k1, k0, handle_vcei | |
875d43e7 | 86 | #ifdef CONFIG_64BIT |
69903d65 | 87 | dsll k1, k1, 1 |
1da177e4 LT |
88 | #endif |
89 | .set pop | |
90 | PTR_L k0, exception_handlers(k1) | |
91 | jr k0 | |
92 | ||
93 | /* | |
94 | * Big shit, we now may have two dirty primary cache lines for the same | |
69903d65 | 95 | * physical address. We can safely invalidate the line pointed to by |
1da177e4 LT |
96 | * c0_badvaddr because after return from this exception handler the |
97 | * load / store will be re-executed. | |
98 | */ | |
99 | handle_vced: | |
69903d65 | 100 | MFC0 k0, CP0_BADVADDR |
1da177e4 LT |
101 | li k1, -4 # Is this ... |
102 | and k0, k1 # ... really needed? | |
103 | mtc0 zero, CP0_TAGLO | |
69903d65 TS |
104 | cache Index_Store_Tag_D, (k0) |
105 | cache Hit_Writeback_Inv_SD, (k0) | |
1da177e4 LT |
106 | #ifdef CONFIG_PROC_FS |
107 | PTR_LA k0, vced_count | |
108 | lw k1, (k0) | |
109 | addiu k1, 1 | |
110 | sw k1, (k0) | |
111 | #endif | |
112 | eret | |
113 | ||
114 | handle_vcei: | |
115 | MFC0 k0, CP0_BADVADDR | |
116 | cache Hit_Writeback_Inv_SD, (k0) # also cleans pi | |
117 | #ifdef CONFIG_PROC_FS | |
118 | PTR_LA k0, vcei_count | |
119 | lw k1, (k0) | |
120 | addiu k1, 1 | |
121 | sw k1, (k0) | |
122 | #endif | |
123 | eret | |
124 | .set pop | |
125 | END(except_vec3_r4000) | |
126 | ||
e4ac58af RB |
127 | __FINIT |
128 | ||
129 | .align 5 | |
130 | NESTED(handle_int, PT_SIZE, sp) | |
131 | SAVE_ALL | |
132 | CLI | |
192ef366 | 133 | TRACE_IRQS_OFF |
e4ac58af | 134 | |
937a8015 RB |
135 | LONG_L s0, TI_REGS($28) |
136 | LONG_S sp, TI_REGS($28) | |
f431baa5 AN |
137 | PTR_LA ra, ret_from_irq |
138 | j plat_irq_dispatch | |
e4ac58af RB |
139 | END(handle_int) |
140 | ||
141 | __INIT | |
142 | ||
1da177e4 LT |
143 | /* |
144 | * Special interrupt vector for MIPS64 ISA & embedded MIPS processors. | |
145 | * This is a dedicated interrupt exception vector which reduces the | |
146 | * interrupt processing overhead. The jump instruction will be replaced | |
147 | * at the initialization time. | |
148 | * | |
149 | * Be careful when changing this, it has to be at most 128 bytes | |
150 | * to fit into space reserved for the exception handler. | |
151 | */ | |
152 | NESTED(except_vec4, 0, sp) | |
153 | 1: j 1b /* Dummy, will be replaced */ | |
154 | END(except_vec4) | |
155 | ||
156 | /* | |
157 | * EJTAG debug exception handler. | |
158 | * The EJTAG debug exception entry point is 0xbfc00480, which | |
159 | * normally is in the boot PROM, so the boot PROM must do a | |
160 | * unconditional jump to this vector. | |
161 | */ | |
162 | NESTED(except_vec_ejtag_debug, 0, sp) | |
163 | j ejtag_debug_handler | |
164 | END(except_vec_ejtag_debug) | |
165 | ||
166 | __FINIT | |
167 | ||
e01402b1 RB |
168 | /* |
169 | * Vectored interrupt handler. | |
170 | * This prototype is copied to ebase + n*IntCtl.VS and patched | |
171 | * to invoke the handler | |
172 | */ | |
173 | NESTED(except_vec_vi, 0, sp) | |
174 | SAVE_SOME | |
175 | SAVE_AT | |
176 | .set push | |
177 | .set noreorder | |
41c594ab RB |
178 | #ifdef CONFIG_MIPS_MT_SMTC |
179 | /* | |
180 | * To keep from blindly blocking *all* interrupts | |
181 | * during service by SMTC kernel, we also want to | |
182 | * pass the IM value to be cleared. | |
183 | */ | |
184 | EXPORT(except_vec_vi_mori) | |
185 | ori a0, $0, 0 | |
186 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
e01402b1 RB |
187 | EXPORT(except_vec_vi_lui) |
188 | lui v0, 0 /* Patched */ | |
189 | j except_vec_vi_handler | |
190 | EXPORT(except_vec_vi_ori) | |
191 | ori v0, 0 /* Patched */ | |
192 | .set pop | |
193 | END(except_vec_vi) | |
194 | EXPORT(except_vec_vi_end) | |
195 | ||
196 | /* | |
197 | * Common Vectored Interrupt code | |
198 | * Complete the register saves and invoke the handler which is passed in $v0 | |
199 | */ | |
200 | NESTED(except_vec_vi_handler, 0, sp) | |
201 | SAVE_TEMP | |
202 | SAVE_STATIC | |
41c594ab RB |
203 | #ifdef CONFIG_MIPS_MT_SMTC |
204 | /* | |
205 | * SMTC has an interesting problem that interrupts are level-triggered, | |
206 | * and the CLI macro will clear EXL, potentially causing a duplicate | |
207 | * interrupt service invocation. So we need to clear the associated | |
208 | * IM bit of Status prior to doing CLI, and restore it after the | |
209 | * service routine has been invoked - we must assume that the | |
210 | * service routine will have cleared the state, and any active | |
211 | * level represents a new or otherwised unserviced event... | |
212 | */ | |
213 | mfc0 t1, CP0_STATUS | |
214 | and t0, a0, t1 | |
215 | mfc0 t2, CP0_TCCONTEXT | |
216 | or t0, t0, t2 | |
217 | mtc0 t0, CP0_TCCONTEXT | |
218 | xor t1, t1, t0 | |
219 | mtc0 t1, CP0_STATUS | |
4277ff5e | 220 | _ehb |
41c594ab | 221 | #endif /* CONFIG_MIPS_MT_SMTC */ |
e01402b1 | 222 | CLI |
192ef366 | 223 | TRACE_IRQS_OFF |
937a8015 RB |
224 | |
225 | LONG_L s0, TI_REGS($28) | |
226 | LONG_S sp, TI_REGS($28) | |
23126692 | 227 | PTR_LA ra, ret_from_irq |
f431baa5 | 228 | jr v0 |
e01402b1 RB |
229 | END(except_vec_vi_handler) |
230 | ||
1da177e4 LT |
231 | /* |
232 | * EJTAG debug exception handler. | |
233 | */ | |
234 | NESTED(ejtag_debug_handler, PT_SIZE, sp) | |
235 | .set push | |
236 | .set noat | |
237 | MTC0 k0, CP0_DESAVE | |
238 | mfc0 k0, CP0_DEBUG | |
239 | ||
240 | sll k0, k0, 30 # Check for SDBBP. | |
241 | bgez k0, ejtag_return | |
242 | ||
243 | PTR_LA k0, ejtag_debug_buffer | |
244 | LONG_S k1, 0(k0) | |
245 | SAVE_ALL | |
246 | move a0, sp | |
247 | jal ejtag_exception_handler | |
248 | RESTORE_ALL | |
249 | PTR_LA k0, ejtag_debug_buffer | |
250 | LONG_L k1, 0(k0) | |
251 | ||
252 | ejtag_return: | |
253 | MFC0 k0, CP0_DESAVE | |
254 | .set mips32 | |
255 | deret | |
256 | .set pop | |
257 | END(ejtag_debug_handler) | |
258 | ||
259 | /* | |
260 | * This buffer is reserved for the use of the EJTAG debug | |
261 | * handler. | |
262 | */ | |
263 | .data | |
264 | EXPORT(ejtag_debug_buffer) | |
265 | .fill LONGSIZE | |
266 | .previous | |
267 | ||
268 | __INIT | |
269 | ||
270 | /* | |
271 | * NMI debug exception handler for MIPS reference boards. | |
272 | * The NMI debug exception entry point is 0xbfc00000, which | |
273 | * normally is in the boot PROM, so the boot PROM must do a | |
274 | * unconditional jump to this vector. | |
275 | */ | |
276 | NESTED(except_vec_nmi, 0, sp) | |
277 | j nmi_handler | |
278 | END(except_vec_nmi) | |
279 | ||
280 | __FINIT | |
281 | ||
282 | NESTED(nmi_handler, PT_SIZE, sp) | |
283 | .set push | |
284 | .set noat | |
1da177e4 LT |
285 | SAVE_ALL |
286 | move a0, sp | |
287 | jal nmi_exception_handler | |
288 | RESTORE_ALL | |
4f0638ba | 289 | .set mips3 |
1da177e4 LT |
290 | eret |
291 | .set pop | |
292 | END(nmi_handler) | |
293 | ||
294 | .macro __build_clear_none | |
295 | .endm | |
296 | ||
297 | .macro __build_clear_sti | |
192ef366 | 298 | TRACE_IRQS_ON |
1da177e4 LT |
299 | STI |
300 | .endm | |
301 | ||
302 | .macro __build_clear_cli | |
303 | CLI | |
192ef366 | 304 | TRACE_IRQS_OFF |
1da177e4 LT |
305 | .endm |
306 | ||
307 | .macro __build_clear_fpe | |
308 | cfc1 a1, fcr31 | |
309 | li a2, ~(0x3f << 12) | |
310 | and a2, a1 | |
311 | ctc1 a2, fcr31 | |
192ef366 | 312 | TRACE_IRQS_ON |
1da177e4 LT |
313 | STI |
314 | .endm | |
315 | ||
316 | .macro __build_clear_ade | |
317 | MFC0 t0, CP0_BADVADDR | |
318 | PTR_S t0, PT_BVADDR(sp) | |
319 | KMODE | |
320 | .endm | |
321 | ||
322 | .macro __BUILD_silent exception | |
323 | .endm | |
324 | ||
325 | /* Gas tries to parse the PRINT argument as a string containing | |
326 | string escapes and emits bogus warnings if it believes to | |
327 | recognize an unknown escape code. So make the arguments | |
328 | start with an n and gas will believe \n is ok ... */ | |
329 | .macro __BUILD_verbose nexception | |
330 | LONG_L a1, PT_EPC(sp) | |
766160c2 | 331 | #ifdef CONFIG_32BIT |
1da177e4 | 332 | PRINT("Got \nexception at %08lx\012") |
42a3b4f2 | 333 | #endif |
766160c2 | 334 | #ifdef CONFIG_64BIT |
1da177e4 | 335 | PRINT("Got \nexception at %016lx\012") |
42a3b4f2 | 336 | #endif |
1da177e4 LT |
337 | .endm |
338 | ||
339 | .macro __BUILD_count exception | |
340 | LONG_L t0,exception_count_\exception | |
341 | LONG_ADDIU t0, 1 | |
342 | LONG_S t0,exception_count_\exception | |
343 | .comm exception_count\exception, 8, 8 | |
344 | .endm | |
345 | ||
346 | .macro __BUILD_HANDLER exception handler clear verbose ext | |
347 | .align 5 | |
348 | NESTED(handle_\exception, PT_SIZE, sp) | |
349 | .set noat | |
350 | SAVE_ALL | |
351 | FEXPORT(handle_\exception\ext) | |
352 | __BUILD_clear_\clear | |
353 | .set at | |
354 | __BUILD_\verbose \exception | |
355 | move a0, sp | |
23126692 AN |
356 | PTR_LA ra, ret_from_exception |
357 | j do_\handler | |
1da177e4 LT |
358 | END(handle_\exception) |
359 | .endm | |
360 | ||
361 | .macro BUILD_HANDLER exception handler clear verbose | |
362 | __BUILD_HANDLER \exception \handler \clear \verbose _int | |
363 | .endm | |
364 | ||
365 | BUILD_HANDLER adel ade ade silent /* #4 */ | |
366 | BUILD_HANDLER ades ade ade silent /* #5 */ | |
367 | BUILD_HANDLER ibe be cli silent /* #6 */ | |
368 | BUILD_HANDLER dbe be cli silent /* #7 */ | |
369 | BUILD_HANDLER bp bp sti silent /* #9 */ | |
370 | BUILD_HANDLER ri ri sti silent /* #10 */ | |
371 | BUILD_HANDLER cpu cpu sti silent /* #11 */ | |
372 | BUILD_HANDLER ov ov sti silent /* #12 */ | |
373 | BUILD_HANDLER tr tr sti silent /* #13 */ | |
374 | BUILD_HANDLER fpe fpe fpe silent /* #15 */ | |
375 | BUILD_HANDLER mdmx mdmx sti silent /* #22 */ | |
376 | BUILD_HANDLER watch watch sti verbose /* #23 */ | |
377 | BUILD_HANDLER mcheck mcheck cli verbose /* #24 */ | |
e35a5e35 | 378 | BUILD_HANDLER mt mt sti silent /* #25 */ |
e50c0a8f | 379 | BUILD_HANDLER dsp dsp sti silent /* #26 */ |
1da177e4 LT |
380 | BUILD_HANDLER reserved reserved sti verbose /* others */ |
381 | ||
5b10496b AN |
382 | .align 5 |
383 | LEAF(handle_ri_rdhwr_vivt) | |
384 | #ifdef CONFIG_MIPS_MT_SMTC | |
385 | PANIC_PIC("handle_ri_rdhwr_vivt called") | |
386 | #else | |
387 | .set push | |
388 | .set noat | |
389 | .set noreorder | |
390 | /* check if TLB contains a entry for EPC */ | |
391 | MFC0 k1, CP0_ENTRYHI | |
392 | andi k1, 0xff /* ASID_MASK */ | |
393 | MFC0 k0, CP0_EPC | |
394 | PTR_SRL k0, PAGE_SHIFT + 1 | |
395 | PTR_SLL k0, PAGE_SHIFT + 1 | |
396 | or k1, k0 | |
397 | MTC0 k1, CP0_ENTRYHI | |
398 | mtc0_tlbw_hazard | |
399 | tlbp | |
400 | tlb_probe_hazard | |
401 | mfc0 k1, CP0_INDEX | |
402 | .set pop | |
403 | bltz k1, handle_ri /* slow path */ | |
404 | /* fall thru */ | |
405 | #endif | |
406 | END(handle_ri_rdhwr_vivt) | |
407 | ||
408 | LEAF(handle_ri_rdhwr) | |
409 | .set push | |
410 | .set noat | |
411 | .set noreorder | |
412 | /* 0x7c03e83b: rdhwr v1,$29 */ | |
413 | MFC0 k1, CP0_EPC | |
414 | lui k0, 0x7c03 | |
415 | lw k1, (k1) | |
416 | ori k0, 0xe83b | |
417 | .set reorder | |
418 | bne k0, k1, handle_ri /* if not ours */ | |
419 | /* The insn is rdhwr. No need to check CAUSE.BD here. */ | |
420 | get_saved_sp /* k1 := current_thread_info */ | |
421 | .set noreorder | |
422 | MFC0 k0, CP0_EPC | |
423 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
424 | ori k1, _THREAD_MASK | |
425 | xori k1, _THREAD_MASK | |
426 | LONG_L v1, TI_TP_VALUE(k1) | |
427 | LONG_ADDIU k0, 4 | |
428 | jr k0 | |
429 | rfe | |
430 | #else | |
431 | LONG_ADDIU k0, 4 /* stall on $k0 */ | |
432 | MTC0 k0, CP0_EPC | |
433 | /* I hope three instructions between MTC0 and ERET are enough... */ | |
434 | ori k1, _THREAD_MASK | |
435 | xori k1, _THREAD_MASK | |
436 | LONG_L v1, TI_TP_VALUE(k1) | |
437 | .set mips3 | |
438 | eret | |
439 | .set mips0 | |
440 | #endif | |
441 | .set pop | |
442 | END(handle_ri_rdhwr) | |
443 | ||
875d43e7 | 444 | #ifdef CONFIG_64BIT |
1da177e4 LT |
445 | /* A temporary overflow handler used by check_daddi(). */ |
446 | ||
447 | __INIT | |
448 | ||
449 | BUILD_HANDLER daddi_ov daddi_ov none silent /* #12 */ | |
450 | #endif |