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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 | * arch/sh64/kernel/entry.S | |
7 | * | |
8 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
9 | * Copyright (C) 2004, 2005 Paul Mundt | |
10 | * Copyright (C) 2003, 2004 Richard Curnow | |
11 | * | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/sys.h> | |
343ac722 | 15 | #include <asm/cpu/registers.h> |
1da177e4 | 16 | #include <asm/processor.h> |
1da177e4 LT |
17 | #include <asm/unistd.h> |
18 | #include <asm/thread_info.h> | |
19 | #include <asm/asm-offsets.h> | |
20 | ||
21 | /* | |
22 | * SR fields. | |
23 | */ | |
24 | #define SR_ASID_MASK 0x00ff0000 | |
25 | #define SR_FD_MASK 0x00008000 | |
26 | #define SR_SS 0x08000000 | |
27 | #define SR_BL 0x10000000 | |
28 | #define SR_MD 0x40000000 | |
29 | ||
30 | /* | |
31 | * Event code. | |
32 | */ | |
33 | #define EVENT_INTERRUPT 0 | |
34 | #define EVENT_FAULT_TLB 1 | |
35 | #define EVENT_FAULT_NOT_TLB 2 | |
36 | #define EVENT_DEBUG 3 | |
37 | ||
38 | /* EXPEVT values */ | |
39 | #define RESET_CAUSE 0x20 | |
40 | #define DEBUGSS_CAUSE 0x980 | |
41 | ||
42 | /* | |
43 | * Frame layout. Quad index. | |
44 | */ | |
45 | #define FRAME_T(x) FRAME_TBASE+(x*8) | |
46 | #define FRAME_R(x) FRAME_RBASE+(x*8) | |
47 | #define FRAME_S(x) FRAME_SBASE+(x*8) | |
48 | #define FSPC 0 | |
49 | #define FSSR 1 | |
50 | #define FSYSCALL_ID 2 | |
51 | ||
52 | /* Arrange the save frame to be a multiple of 32 bytes long */ | |
53 | #define FRAME_SBASE 0 | |
54 | #define FRAME_RBASE (FRAME_SBASE+(3*8)) /* SYSCALL_ID - SSR - SPC */ | |
55 | #define FRAME_TBASE (FRAME_RBASE+(63*8)) /* r0 - r62 */ | |
56 | #define FRAME_PBASE (FRAME_TBASE+(8*8)) /* tr0 -tr7 */ | |
57 | #define FRAME_SIZE (FRAME_PBASE+(2*8)) /* pad0-pad1 */ | |
58 | ||
59 | #define FP_FRAME_SIZE FP_FRAME_BASE+(33*8) /* dr0 - dr31 + fpscr */ | |
60 | #define FP_FRAME_BASE 0 | |
61 | ||
62 | #define SAVED_R2 0*8 | |
63 | #define SAVED_R3 1*8 | |
64 | #define SAVED_R4 2*8 | |
65 | #define SAVED_R5 3*8 | |
66 | #define SAVED_R18 4*8 | |
67 | #define SAVED_R6 5*8 | |
68 | #define SAVED_TR0 6*8 | |
69 | ||
70 | /* These are the registers saved in the TLB path that aren't saved in the first | |
71 | level of the normal one. */ | |
72 | #define TLB_SAVED_R25 7*8 | |
73 | #define TLB_SAVED_TR1 8*8 | |
74 | #define TLB_SAVED_TR2 9*8 | |
75 | #define TLB_SAVED_TR3 10*8 | |
76 | #define TLB_SAVED_TR4 11*8 | |
77 | /* Save R0/R1 : PT-migrating compiler currently dishounours -ffixed-r0 and -ffixed-r1 causing | |
78 | breakage otherwise. */ | |
79 | #define TLB_SAVED_R0 12*8 | |
80 | #define TLB_SAVED_R1 13*8 | |
81 | ||
82 | #define CLI() \ | |
83 | getcon SR, r6; \ | |
84 | ori r6, 0xf0, r6; \ | |
85 | putcon r6, SR; | |
86 | ||
87 | #define STI() \ | |
88 | getcon SR, r6; \ | |
89 | andi r6, ~0xf0, r6; \ | |
90 | putcon r6, SR; | |
91 | ||
92 | #ifdef CONFIG_PREEMPT | |
93 | # define preempt_stop() CLI() | |
94 | #else | |
95 | # define preempt_stop() | |
96 | # define resume_kernel restore_all | |
97 | #endif | |
98 | ||
99 | .section .data, "aw" | |
100 | ||
101 | #define FAST_TLBMISS_STACK_CACHELINES 4 | |
102 | #define FAST_TLBMISS_STACK_QUADWORDS (4*FAST_TLBMISS_STACK_CACHELINES) | |
103 | ||
104 | /* Register back-up area for all exceptions */ | |
105 | .balign 32 | |
106 | /* Allow for 16 quadwords to be pushed by fast tlbmiss handling | |
107 | * register saves etc. */ | |
108 | .fill FAST_TLBMISS_STACK_QUADWORDS, 8, 0x0 | |
109 | /* This is 32 byte aligned by construction */ | |
110 | /* Register back-up area for all exceptions */ | |
111 | reg_save_area: | |
112 | .quad 0 | |
113 | .quad 0 | |
114 | .quad 0 | |
115 | .quad 0 | |
116 | ||
117 | .quad 0 | |
118 | .quad 0 | |
119 | .quad 0 | |
120 | .quad 0 | |
121 | ||
122 | .quad 0 | |
123 | .quad 0 | |
124 | .quad 0 | |
125 | .quad 0 | |
126 | ||
127 | .quad 0 | |
128 | .quad 0 | |
129 | ||
130 | /* Save area for RESVEC exceptions. We cannot use reg_save_area because of | |
131 | * reentrancy. Note this area may be accessed via physical address. | |
132 | * Align so this fits a whole single cache line, for ease of purging. | |
133 | */ | |
134 | .balign 32,0,32 | |
135 | resvec_save_area: | |
136 | .quad 0 | |
137 | .quad 0 | |
138 | .quad 0 | |
139 | .quad 0 | |
140 | .quad 0 | |
141 | .balign 32,0,32 | |
142 | ||
143 | /* Jump table of 3rd level handlers */ | |
144 | trap_jtable: | |
145 | .long do_exception_error /* 0x000 */ | |
146 | .long do_exception_error /* 0x020 */ | |
147 | .long tlb_miss_load /* 0x040 */ | |
148 | .long tlb_miss_store /* 0x060 */ | |
149 | ! ARTIFICIAL pseudo-EXPEVT setting | |
150 | .long do_debug_interrupt /* 0x080 */ | |
151 | .long tlb_miss_load /* 0x0A0 */ | |
152 | .long tlb_miss_store /* 0x0C0 */ | |
153 | .long do_address_error_load /* 0x0E0 */ | |
154 | .long do_address_error_store /* 0x100 */ | |
155 | #ifdef CONFIG_SH_FPU | |
156 | .long do_fpu_error /* 0x120 */ | |
157 | #else | |
158 | .long do_exception_error /* 0x120 */ | |
159 | #endif | |
160 | .long do_exception_error /* 0x140 */ | |
161 | .long system_call /* 0x160 */ | |
162 | .long do_reserved_inst /* 0x180 */ | |
163 | .long do_illegal_slot_inst /* 0x1A0 */ | |
92b59258 | 164 | .long do_exception_error /* 0x1C0 - NMI */ |
1da177e4 LT |
165 | .long do_exception_error /* 0x1E0 */ |
166 | .rept 15 | |
167 | .long do_IRQ /* 0x200 - 0x3C0 */ | |
168 | .endr | |
169 | .long do_exception_error /* 0x3E0 */ | |
170 | .rept 32 | |
171 | .long do_IRQ /* 0x400 - 0x7E0 */ | |
172 | .endr | |
173 | .long fpu_error_or_IRQA /* 0x800 */ | |
174 | .long fpu_error_or_IRQB /* 0x820 */ | |
175 | .long do_IRQ /* 0x840 */ | |
176 | .long do_IRQ /* 0x860 */ | |
177 | .rept 6 | |
178 | .long do_exception_error /* 0x880 - 0x920 */ | |
179 | .endr | |
180 | .long do_software_break_point /* 0x940 */ | |
181 | .long do_exception_error /* 0x960 */ | |
182 | .long do_single_step /* 0x980 */ | |
183 | ||
184 | .rept 3 | |
185 | .long do_exception_error /* 0x9A0 - 0x9E0 */ | |
186 | .endr | |
187 | .long do_IRQ /* 0xA00 */ | |
188 | .long do_IRQ /* 0xA20 */ | |
189 | .long itlb_miss_or_IRQ /* 0xA40 */ | |
190 | .long do_IRQ /* 0xA60 */ | |
191 | .long do_IRQ /* 0xA80 */ | |
192 | .long itlb_miss_or_IRQ /* 0xAA0 */ | |
193 | .long do_exception_error /* 0xAC0 */ | |
194 | .long do_address_error_exec /* 0xAE0 */ | |
195 | .rept 8 | |
196 | .long do_exception_error /* 0xB00 - 0xBE0 */ | |
197 | .endr | |
198 | .rept 18 | |
199 | .long do_IRQ /* 0xC00 - 0xE20 */ | |
200 | .endr | |
201 | ||
202 | .section .text64, "ax" | |
203 | ||
204 | /* | |
205 | * --- Exception/Interrupt/Event Handling Section | |
206 | */ | |
207 | ||
208 | /* | |
209 | * VBR and RESVEC blocks. | |
210 | * | |
211 | * First level handler for VBR-based exceptions. | |
212 | * | |
213 | * To avoid waste of space, align to the maximum text block size. | |
214 | * This is assumed to be at most 128 bytes or 32 instructions. | |
215 | * DO NOT EXCEED 32 instructions on the first level handlers ! | |
216 | * | |
217 | * Also note that RESVEC is contained within the VBR block | |
218 | * where the room left (1KB - TEXT_SIZE) allows placing | |
219 | * the RESVEC block (at most 512B + TEXT_SIZE). | |
220 | * | |
221 | * So first (and only) level handler for RESVEC-based exceptions. | |
222 | * | |
223 | * Where the fault/interrupt is handled (not_a_tlb_miss, tlb_miss | |
224 | * and interrupt) we are a lot tight with register space until | |
225 | * saving onto the stack frame, which is done in handle_exception(). | |
226 | * | |
227 | */ | |
228 | ||
229 | #define TEXT_SIZE 128 | |
230 | #define BLOCK_SIZE 1664 /* Dynamic check, 13*128 */ | |
231 | ||
232 | .balign TEXT_SIZE | |
233 | LVBR_block: | |
234 | .space 256, 0 /* Power-on class handler, */ | |
235 | /* not required here */ | |
236 | not_a_tlb_miss: | |
237 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
238 | /* Save original stack pointer into KCR1 */ | |
239 | putcon SP, KCR1 | |
240 | ||
241 | /* Save other original registers into reg_save_area */ | |
242 | movi reg_save_area, SP | |
243 | st.q SP, SAVED_R2, r2 | |
244 | st.q SP, SAVED_R3, r3 | |
245 | st.q SP, SAVED_R4, r4 | |
246 | st.q SP, SAVED_R5, r5 | |
247 | st.q SP, SAVED_R6, r6 | |
248 | st.q SP, SAVED_R18, r18 | |
249 | gettr tr0, r3 | |
250 | st.q SP, SAVED_TR0, r3 | |
251 | ||
252 | /* Set args for Non-debug, Not a TLB miss class handler */ | |
253 | getcon EXPEVT, r2 | |
254 | movi ret_from_exception, r3 | |
255 | ori r3, 1, r3 | |
256 | movi EVENT_FAULT_NOT_TLB, r4 | |
257 | or SP, ZERO, r5 | |
258 | getcon KCR1, SP | |
259 | pta handle_exception, tr0 | |
260 | blink tr0, ZERO | |
261 | ||
262 | .balign 256 | |
263 | ! VBR+0x200 | |
264 | nop | |
265 | .balign 256 | |
266 | ! VBR+0x300 | |
267 | nop | |
268 | .balign 256 | |
269 | /* | |
270 | * Instead of the natural .balign 1024 place RESVEC here | |
271 | * respecting the final 1KB alignment. | |
272 | */ | |
273 | .balign TEXT_SIZE | |
274 | /* | |
275 | * Instead of '.space 1024-TEXT_SIZE' place the RESVEC | |
276 | * block making sure the final alignment is correct. | |
277 | */ | |
278 | tlb_miss: | |
279 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
280 | putcon SP, KCR1 | |
281 | movi reg_save_area, SP | |
282 | /* SP is guaranteed 32-byte aligned. */ | |
283 | st.q SP, TLB_SAVED_R0 , r0 | |
284 | st.q SP, TLB_SAVED_R1 , r1 | |
285 | st.q SP, SAVED_R2 , r2 | |
286 | st.q SP, SAVED_R3 , r3 | |
287 | st.q SP, SAVED_R4 , r4 | |
288 | st.q SP, SAVED_R5 , r5 | |
289 | st.q SP, SAVED_R6 , r6 | |
290 | st.q SP, SAVED_R18, r18 | |
291 | ||
292 | /* Save R25 for safety; as/ld may want to use it to achieve the call to | |
293 | * the code in mm/tlbmiss.c */ | |
294 | st.q SP, TLB_SAVED_R25, r25 | |
295 | gettr tr0, r2 | |
296 | gettr tr1, r3 | |
297 | gettr tr2, r4 | |
298 | gettr tr3, r5 | |
299 | gettr tr4, r18 | |
300 | st.q SP, SAVED_TR0 , r2 | |
301 | st.q SP, TLB_SAVED_TR1 , r3 | |
302 | st.q SP, TLB_SAVED_TR2 , r4 | |
303 | st.q SP, TLB_SAVED_TR3 , r5 | |
304 | st.q SP, TLB_SAVED_TR4 , r18 | |
305 | ||
306 | pt do_fast_page_fault, tr0 | |
307 | getcon SSR, r2 | |
308 | getcon EXPEVT, r3 | |
309 | getcon TEA, r4 | |
310 | shlri r2, 30, r2 | |
311 | andi r2, 1, r2 /* r2 = SSR.MD */ | |
312 | blink tr0, LINK | |
313 | ||
314 | pt fixup_to_invoke_general_handler, tr1 | |
315 | ||
316 | /* If the fast path handler fixed the fault, just drop through quickly | |
317 | to the restore code right away to return to the excepting context. | |
318 | */ | |
319 | beqi/u r2, 0, tr1 | |
320 | ||
321 | fast_tlb_miss_restore: | |
322 | ld.q SP, SAVED_TR0, r2 | |
323 | ld.q SP, TLB_SAVED_TR1, r3 | |
324 | ld.q SP, TLB_SAVED_TR2, r4 | |
325 | ||
326 | ld.q SP, TLB_SAVED_TR3, r5 | |
327 | ld.q SP, TLB_SAVED_TR4, r18 | |
328 | ||
329 | ptabs r2, tr0 | |
330 | ptabs r3, tr1 | |
331 | ptabs r4, tr2 | |
332 | ptabs r5, tr3 | |
333 | ptabs r18, tr4 | |
334 | ||
335 | ld.q SP, TLB_SAVED_R0, r0 | |
336 | ld.q SP, TLB_SAVED_R1, r1 | |
337 | ld.q SP, SAVED_R2, r2 | |
338 | ld.q SP, SAVED_R3, r3 | |
339 | ld.q SP, SAVED_R4, r4 | |
340 | ld.q SP, SAVED_R5, r5 | |
341 | ld.q SP, SAVED_R6, r6 | |
342 | ld.q SP, SAVED_R18, r18 | |
343 | ld.q SP, TLB_SAVED_R25, r25 | |
344 | ||
345 | getcon KCR1, SP | |
346 | rte | |
347 | nop /* for safety, in case the code is run on sh5-101 cut1.x */ | |
348 | ||
349 | fixup_to_invoke_general_handler: | |
350 | ||
351 | /* OK, new method. Restore stuff that's not expected to get saved into | |
352 | the 'first-level' reg save area, then just fall through to setting | |
353 | up the registers and calling the second-level handler. */ | |
354 | ||
355 | /* 2nd level expects r2,3,4,5,6,18,tr0 to be saved. So we must restore | |
356 | r25,tr1-4 and save r6 to get into the right state. */ | |
357 | ||
358 | ld.q SP, TLB_SAVED_TR1, r3 | |
359 | ld.q SP, TLB_SAVED_TR2, r4 | |
360 | ld.q SP, TLB_SAVED_TR3, r5 | |
361 | ld.q SP, TLB_SAVED_TR4, r18 | |
362 | ld.q SP, TLB_SAVED_R25, r25 | |
363 | ||
364 | ld.q SP, TLB_SAVED_R0, r0 | |
365 | ld.q SP, TLB_SAVED_R1, r1 | |
366 | ||
367 | ptabs/u r3, tr1 | |
368 | ptabs/u r4, tr2 | |
369 | ptabs/u r5, tr3 | |
370 | ptabs/u r18, tr4 | |
371 | ||
372 | /* Set args for Non-debug, TLB miss class handler */ | |
373 | getcon EXPEVT, r2 | |
374 | movi ret_from_exception, r3 | |
375 | ori r3, 1, r3 | |
376 | movi EVENT_FAULT_TLB, r4 | |
377 | or SP, ZERO, r5 | |
378 | getcon KCR1, SP | |
379 | pta handle_exception, tr0 | |
380 | blink tr0, ZERO | |
381 | ||
382 | /* NB TAKE GREAT CARE HERE TO ENSURE THAT THE INTERRUPT CODE | |
383 | DOES END UP AT VBR+0x600 */ | |
384 | nop | |
385 | nop | |
386 | nop | |
387 | nop | |
388 | nop | |
389 | nop | |
390 | ||
391 | .balign 256 | |
392 | /* VBR + 0x600 */ | |
393 | ||
394 | interrupt: | |
395 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
396 | /* Save original stack pointer into KCR1 */ | |
397 | putcon SP, KCR1 | |
398 | ||
399 | /* Save other original registers into reg_save_area */ | |
400 | movi reg_save_area, SP | |
401 | st.q SP, SAVED_R2, r2 | |
402 | st.q SP, SAVED_R3, r3 | |
403 | st.q SP, SAVED_R4, r4 | |
404 | st.q SP, SAVED_R5, r5 | |
405 | st.q SP, SAVED_R6, r6 | |
406 | st.q SP, SAVED_R18, r18 | |
407 | gettr tr0, r3 | |
408 | st.q SP, SAVED_TR0, r3 | |
409 | ||
410 | /* Set args for interrupt class handler */ | |
411 | getcon INTEVT, r2 | |
412 | movi ret_from_irq, r3 | |
413 | ori r3, 1, r3 | |
414 | movi EVENT_INTERRUPT, r4 | |
415 | or SP, ZERO, r5 | |
416 | getcon KCR1, SP | |
417 | pta handle_exception, tr0 | |
418 | blink tr0, ZERO | |
419 | .balign TEXT_SIZE /* let's waste the bare minimum */ | |
420 | ||
421 | LVBR_block_end: /* Marker. Used for total checking */ | |
422 | ||
423 | .balign 256 | |
424 | LRESVEC_block: | |
425 | /* Panic handler. Called with MMU off. Possible causes/actions: | |
426 | * - Reset: Jump to program start. | |
427 | * - Single Step: Turn off Single Step & return. | |
428 | * - Others: Call panic handler, passing PC as arg. | |
429 | * (this may need to be extended...) | |
430 | */ | |
431 | reset_or_panic: | |
432 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
433 | putcon SP, DCR | |
434 | /* First save r0-1 and tr0, as we need to use these */ | |
36763b22 | 435 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
1da177e4 LT |
436 | st.q SP, 0, r0 |
437 | st.q SP, 8, r1 | |
438 | gettr tr0, r0 | |
439 | st.q SP, 32, r0 | |
440 | ||
441 | /* Check cause */ | |
442 | getcon EXPEVT, r0 | |
443 | movi RESET_CAUSE, r1 | |
444 | sub r1, r0, r1 /* r1=0 if reset */ | |
36763b22 | 445 | movi _stext-CONFIG_PAGE_OFFSET, r0 |
1da177e4 LT |
446 | ori r0, 1, r0 |
447 | ptabs r0, tr0 | |
448 | beqi r1, 0, tr0 /* Jump to start address if reset */ | |
449 | ||
450 | getcon EXPEVT, r0 | |
451 | movi DEBUGSS_CAUSE, r1 | |
452 | sub r1, r0, r1 /* r1=0 if single step */ | |
453 | pta single_step_panic, tr0 | |
454 | beqi r1, 0, tr0 /* jump if single step */ | |
455 | ||
456 | /* Now jump to where we save the registers. */ | |
36763b22 | 457 | movi panic_stash_regs-CONFIG_PAGE_OFFSET, r1 |
1da177e4 LT |
458 | ptabs r1, tr0 |
459 | blink tr0, r63 | |
460 | ||
461 | single_step_panic: | |
462 | /* We are in a handler with Single Step set. We need to resume the | |
463 | * handler, by turning on MMU & turning off Single Step. */ | |
464 | getcon SSR, r0 | |
465 | movi SR_MMU, r1 | |
466 | or r0, r1, r0 | |
467 | movi ~SR_SS, r1 | |
468 | and r0, r1, r0 | |
469 | putcon r0, SSR | |
470 | /* Restore EXPEVT, as the rte won't do this */ | |
471 | getcon PEXPEVT, r0 | |
472 | putcon r0, EXPEVT | |
473 | /* Restore regs */ | |
474 | ld.q SP, 32, r0 | |
475 | ptabs r0, tr0 | |
476 | ld.q SP, 0, r0 | |
477 | ld.q SP, 8, r1 | |
478 | getcon DCR, SP | |
479 | synco | |
480 | rte | |
481 | ||
482 | ||
483 | .balign 256 | |
484 | debug_exception: | |
485 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
486 | /* | |
487 | * Single step/software_break_point first level handler. | |
488 | * Called with MMU off, so the first thing we do is enable it | |
489 | * by doing an rte with appropriate SSR. | |
490 | */ | |
491 | putcon SP, DCR | |
492 | /* Save SSR & SPC, together with R0 & R1, as we need to use 2 regs. */ | |
36763b22 | 493 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
1da177e4 LT |
494 | |
495 | /* With the MMU off, we are bypassing the cache, so purge any | |
496 | * data that will be made stale by the following stores. | |
497 | */ | |
498 | ocbp SP, 0 | |
499 | synco | |
500 | ||
501 | st.q SP, 0, r0 | |
502 | st.q SP, 8, r1 | |
503 | getcon SPC, r0 | |
504 | st.q SP, 16, r0 | |
505 | getcon SSR, r0 | |
506 | st.q SP, 24, r0 | |
507 | ||
508 | /* Enable MMU, block exceptions, set priv mode, disable single step */ | |
509 | movi SR_MMU | SR_BL | SR_MD, r1 | |
510 | or r0, r1, r0 | |
511 | movi ~SR_SS, r1 | |
512 | and r0, r1, r0 | |
513 | putcon r0, SSR | |
514 | /* Force control to debug_exception_2 when rte is executed */ | |
515 | movi debug_exeception_2, r0 | |
516 | ori r0, 1, r0 /* force SHmedia, just in case */ | |
517 | putcon r0, SPC | |
518 | getcon DCR, SP | |
519 | synco | |
520 | rte | |
521 | debug_exeception_2: | |
522 | /* Restore saved regs */ | |
523 | putcon SP, KCR1 | |
524 | movi resvec_save_area, SP | |
525 | ld.q SP, 24, r0 | |
526 | putcon r0, SSR | |
527 | ld.q SP, 16, r0 | |
528 | putcon r0, SPC | |
529 | ld.q SP, 0, r0 | |
530 | ld.q SP, 8, r1 | |
531 | ||
532 | /* Save other original registers into reg_save_area */ | |
533 | movi reg_save_area, SP | |
534 | st.q SP, SAVED_R2, r2 | |
535 | st.q SP, SAVED_R3, r3 | |
536 | st.q SP, SAVED_R4, r4 | |
537 | st.q SP, SAVED_R5, r5 | |
538 | st.q SP, SAVED_R6, r6 | |
539 | st.q SP, SAVED_R18, r18 | |
540 | gettr tr0, r3 | |
541 | st.q SP, SAVED_TR0, r3 | |
542 | ||
543 | /* Set args for debug class handler */ | |
544 | getcon EXPEVT, r2 | |
545 | movi ret_from_exception, r3 | |
546 | ori r3, 1, r3 | |
547 | movi EVENT_DEBUG, r4 | |
548 | or SP, ZERO, r5 | |
549 | getcon KCR1, SP | |
550 | pta handle_exception, tr0 | |
551 | blink tr0, ZERO | |
552 | ||
553 | .balign 256 | |
554 | debug_interrupt: | |
555 | /* !!! WE COME HERE IN REAL MODE !!! */ | |
556 | /* Hook-up debug interrupt to allow various debugging options to be | |
557 | * hooked into its handler. */ | |
558 | /* Save original stack pointer into KCR1 */ | |
559 | synco | |
560 | putcon SP, KCR1 | |
36763b22 | 561 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
1da177e4 LT |
562 | ocbp SP, 0 |
563 | ocbp SP, 32 | |
564 | synco | |
565 | ||
566 | /* Save other original registers into reg_save_area thru real addresses */ | |
567 | st.q SP, SAVED_R2, r2 | |
568 | st.q SP, SAVED_R3, r3 | |
569 | st.q SP, SAVED_R4, r4 | |
570 | st.q SP, SAVED_R5, r5 | |
571 | st.q SP, SAVED_R6, r6 | |
572 | st.q SP, SAVED_R18, r18 | |
573 | gettr tr0, r3 | |
574 | st.q SP, SAVED_TR0, r3 | |
575 | ||
576 | /* move (spc,ssr)->(pspc,pssr). The rte will shift | |
577 | them back again, so that they look like the originals | |
578 | as far as the real handler code is concerned. */ | |
579 | getcon spc, r6 | |
580 | putcon r6, pspc | |
581 | getcon ssr, r6 | |
582 | putcon r6, pssr | |
583 | ||
584 | ! construct useful SR for handle_exception | |
585 | movi 3, r6 | |
586 | shlli r6, 30, r6 | |
587 | getcon sr, r18 | |
588 | or r18, r6, r6 | |
589 | putcon r6, ssr | |
590 | ||
591 | ! SSR is now the current SR with the MD and MMU bits set | |
592 | ! i.e. the rte will switch back to priv mode and put | |
593 | ! the mmu back on | |
594 | ||
595 | ! construct spc | |
596 | movi handle_exception, r18 | |
597 | ori r18, 1, r18 ! for safety (do we need this?) | |
598 | putcon r18, spc | |
599 | ||
600 | /* Set args for Non-debug, Not a TLB miss class handler */ | |
601 | ||
602 | ! EXPEVT==0x80 is unused, so 'steal' this value to put the | |
603 | ! debug interrupt handler in the vectoring table | |
604 | movi 0x80, r2 | |
605 | movi ret_from_exception, r3 | |
606 | ori r3, 1, r3 | |
607 | movi EVENT_FAULT_NOT_TLB, r4 | |
608 | ||
609 | or SP, ZERO, r5 | |
36763b22 | 610 | movi CONFIG_PAGE_OFFSET, r6 |
1da177e4 LT |
611 | add r6, r5, r5 |
612 | getcon KCR1, SP | |
613 | ||
614 | synco ! for safety | |
615 | rte ! -> handle_exception, switch back to priv mode again | |
616 | ||
617 | LRESVEC_block_end: /* Marker. Unused. */ | |
618 | ||
619 | .balign TEXT_SIZE | |
620 | ||
621 | /* | |
622 | * Second level handler for VBR-based exceptions. Pre-handler. | |
623 | * In common to all stack-frame sensitive handlers. | |
624 | * | |
625 | * Inputs: | |
626 | * (KCR0) Current [current task union] | |
627 | * (KCR1) Original SP | |
628 | * (r2) INTEVT/EXPEVT | |
629 | * (r3) appropriate return address | |
630 | * (r4) Event (0 = interrupt, 1 = TLB miss fault, 2 = Not TLB miss fault, 3=debug) | |
631 | * (r5) Pointer to reg_save_area | |
632 | * (SP) Original SP | |
633 | * | |
634 | * Available registers: | |
635 | * (r6) | |
636 | * (r18) | |
637 | * (tr0) | |
638 | * | |
639 | */ | |
640 | handle_exception: | |
641 | /* Common 2nd level handler. */ | |
642 | ||
643 | /* First thing we need an appropriate stack pointer */ | |
644 | getcon SSR, r6 | |
645 | shlri r6, 30, r6 | |
646 | andi r6, 1, r6 | |
647 | pta stack_ok, tr0 | |
648 | bne r6, ZERO, tr0 /* Original stack pointer is fine */ | |
649 | ||
650 | /* Set stack pointer for user fault */ | |
651 | getcon KCR0, SP | |
652 | movi THREAD_SIZE, r6 /* Point to the end */ | |
653 | add SP, r6, SP | |
654 | ||
655 | stack_ok: | |
656 | ||
657 | /* DEBUG : check for underflow/overflow of the kernel stack */ | |
658 | pta no_underflow, tr0 | |
659 | getcon KCR0, r6 | |
660 | movi 1024, r18 | |
661 | add r6, r18, r6 | |
662 | bge SP, r6, tr0 ! ? below 1k from bottom of stack : danger zone | |
663 | ||
664 | /* Just panic to cause a crash. */ | |
665 | bad_sp: | |
666 | ld.b r63, 0, r6 | |
667 | nop | |
668 | ||
669 | no_underflow: | |
670 | pta bad_sp, tr0 | |
671 | getcon kcr0, r6 | |
672 | movi THREAD_SIZE, r18 | |
673 | add r18, r6, r6 | |
674 | bgt SP, r6, tr0 ! sp above the stack | |
675 | ||
676 | /* Make some room for the BASIC frame. */ | |
677 | movi -(FRAME_SIZE), r6 | |
678 | add SP, r6, SP | |
679 | ||
680 | /* Could do this with no stalling if we had another spare register, but the | |
681 | code below will be OK. */ | |
682 | ld.q r5, SAVED_R2, r6 | |
683 | ld.q r5, SAVED_R3, r18 | |
684 | st.q SP, FRAME_R(2), r6 | |
685 | ld.q r5, SAVED_R4, r6 | |
686 | st.q SP, FRAME_R(3), r18 | |
687 | ld.q r5, SAVED_R5, r18 | |
688 | st.q SP, FRAME_R(4), r6 | |
689 | ld.q r5, SAVED_R6, r6 | |
690 | st.q SP, FRAME_R(5), r18 | |
691 | ld.q r5, SAVED_R18, r18 | |
692 | st.q SP, FRAME_R(6), r6 | |
693 | ld.q r5, SAVED_TR0, r6 | |
694 | st.q SP, FRAME_R(18), r18 | |
695 | st.q SP, FRAME_T(0), r6 | |
696 | ||
697 | /* Keep old SP around */ | |
698 | getcon KCR1, r6 | |
699 | ||
700 | /* Save the rest of the general purpose registers */ | |
701 | st.q SP, FRAME_R(0), r0 | |
702 | st.q SP, FRAME_R(1), r1 | |
703 | st.q SP, FRAME_R(7), r7 | |
704 | st.q SP, FRAME_R(8), r8 | |
705 | st.q SP, FRAME_R(9), r9 | |
706 | st.q SP, FRAME_R(10), r10 | |
707 | st.q SP, FRAME_R(11), r11 | |
708 | st.q SP, FRAME_R(12), r12 | |
709 | st.q SP, FRAME_R(13), r13 | |
710 | st.q SP, FRAME_R(14), r14 | |
711 | ||
712 | /* SP is somewhere else */ | |
713 | st.q SP, FRAME_R(15), r6 | |
714 | ||
715 | st.q SP, FRAME_R(16), r16 | |
716 | st.q SP, FRAME_R(17), r17 | |
717 | /* r18 is saved earlier. */ | |
718 | st.q SP, FRAME_R(19), r19 | |
719 | st.q SP, FRAME_R(20), r20 | |
720 | st.q SP, FRAME_R(21), r21 | |
721 | st.q SP, FRAME_R(22), r22 | |
722 | st.q SP, FRAME_R(23), r23 | |
723 | st.q SP, FRAME_R(24), r24 | |
724 | st.q SP, FRAME_R(25), r25 | |
725 | st.q SP, FRAME_R(26), r26 | |
726 | st.q SP, FRAME_R(27), r27 | |
727 | st.q SP, FRAME_R(28), r28 | |
728 | st.q SP, FRAME_R(29), r29 | |
729 | st.q SP, FRAME_R(30), r30 | |
730 | st.q SP, FRAME_R(31), r31 | |
731 | st.q SP, FRAME_R(32), r32 | |
732 | st.q SP, FRAME_R(33), r33 | |
733 | st.q SP, FRAME_R(34), r34 | |
734 | st.q SP, FRAME_R(35), r35 | |
735 | st.q SP, FRAME_R(36), r36 | |
736 | st.q SP, FRAME_R(37), r37 | |
737 | st.q SP, FRAME_R(38), r38 | |
738 | st.q SP, FRAME_R(39), r39 | |
739 | st.q SP, FRAME_R(40), r40 | |
740 | st.q SP, FRAME_R(41), r41 | |
741 | st.q SP, FRAME_R(42), r42 | |
742 | st.q SP, FRAME_R(43), r43 | |
743 | st.q SP, FRAME_R(44), r44 | |
744 | st.q SP, FRAME_R(45), r45 | |
745 | st.q SP, FRAME_R(46), r46 | |
746 | st.q SP, FRAME_R(47), r47 | |
747 | st.q SP, FRAME_R(48), r48 | |
748 | st.q SP, FRAME_R(49), r49 | |
749 | st.q SP, FRAME_R(50), r50 | |
750 | st.q SP, FRAME_R(51), r51 | |
751 | st.q SP, FRAME_R(52), r52 | |
752 | st.q SP, FRAME_R(53), r53 | |
753 | st.q SP, FRAME_R(54), r54 | |
754 | st.q SP, FRAME_R(55), r55 | |
755 | st.q SP, FRAME_R(56), r56 | |
756 | st.q SP, FRAME_R(57), r57 | |
757 | st.q SP, FRAME_R(58), r58 | |
758 | st.q SP, FRAME_R(59), r59 | |
759 | st.q SP, FRAME_R(60), r60 | |
760 | st.q SP, FRAME_R(61), r61 | |
761 | st.q SP, FRAME_R(62), r62 | |
762 | ||
763 | /* | |
764 | * Save the S* registers. | |
765 | */ | |
766 | getcon SSR, r61 | |
767 | st.q SP, FRAME_S(FSSR), r61 | |
768 | getcon SPC, r62 | |
769 | st.q SP, FRAME_S(FSPC), r62 | |
770 | movi -1, r62 /* Reset syscall_nr */ | |
771 | st.q SP, FRAME_S(FSYSCALL_ID), r62 | |
772 | ||
773 | /* Save the rest of the target registers */ | |
774 | gettr tr1, r6 | |
775 | st.q SP, FRAME_T(1), r6 | |
776 | gettr tr2, r6 | |
777 | st.q SP, FRAME_T(2), r6 | |
778 | gettr tr3, r6 | |
779 | st.q SP, FRAME_T(3), r6 | |
780 | gettr tr4, r6 | |
781 | st.q SP, FRAME_T(4), r6 | |
782 | gettr tr5, r6 | |
783 | st.q SP, FRAME_T(5), r6 | |
784 | gettr tr6, r6 | |
785 | st.q SP, FRAME_T(6), r6 | |
786 | gettr tr7, r6 | |
787 | st.q SP, FRAME_T(7), r6 | |
788 | ||
789 | ! setup FP so that unwinder can wind back through nested kernel mode | |
790 | ! exceptions | |
791 | add SP, ZERO, r14 | |
792 | ||
793 | #ifdef CONFIG_POOR_MANS_STRACE | |
794 | /* We've pushed all the registers now, so only r2-r4 hold anything | |
795 | * useful. Move them into callee save registers */ | |
796 | or r2, ZERO, r28 | |
797 | or r3, ZERO, r29 | |
798 | or r4, ZERO, r30 | |
799 | ||
800 | /* Preserve r2 as the event code */ | |
801 | movi evt_debug, r3 | |
802 | ori r3, 1, r3 | |
803 | ptabs r3, tr0 | |
804 | ||
805 | or SP, ZERO, r6 | |
806 | getcon TRA, r5 | |
807 | blink tr0, LINK | |
808 | ||
809 | or r28, ZERO, r2 | |
810 | or r29, ZERO, r3 | |
811 | or r30, ZERO, r4 | |
812 | #endif | |
813 | ||
814 | /* For syscall and debug race condition, get TRA now */ | |
815 | getcon TRA, r5 | |
816 | ||
817 | /* We are in a safe position to turn SR.BL off, but set IMASK=0xf | |
818 | * Also set FD, to catch FPU usage in the kernel. | |
819 | * | |
820 | * benedict.gaster@superh.com 29/07/2002 | |
821 | * | |
822 | * On all SH5-101 revisions it is unsafe to raise the IMASK and at the | |
823 | * same time change BL from 1->0, as any pending interrupt of a level | |
824 | * higher than he previous value of IMASK will leak through and be | |
825 | * taken unexpectedly. | |
826 | * | |
827 | * To avoid this we raise the IMASK and then issue another PUTCON to | |
828 | * enable interrupts. | |
829 | */ | |
830 | getcon SR, r6 | |
831 | movi SR_IMASK | SR_FD, r7 | |
832 | or r6, r7, r6 | |
833 | putcon r6, SR | |
834 | movi SR_UNBLOCK_EXC, r7 | |
835 | and r6, r7, r6 | |
836 | putcon r6, SR | |
837 | ||
838 | ||
839 | /* Now call the appropriate 3rd level handler */ | |
840 | or r3, ZERO, LINK | |
841 | movi trap_jtable, r3 | |
842 | shlri r2, 3, r2 | |
843 | ldx.l r2, r3, r3 | |
844 | shlri r2, 2, r2 | |
845 | ptabs r3, tr0 | |
846 | or SP, ZERO, r3 | |
847 | blink tr0, ZERO | |
848 | ||
849 | /* | |
850 | * Second level handler for VBR-based exceptions. Post-handlers. | |
851 | * | |
852 | * Post-handlers for interrupts (ret_from_irq), exceptions | |
853 | * (ret_from_exception) and common reentrance doors (restore_all | |
854 | * to get back to the original context, ret_from_syscall loop to | |
855 | * check kernel exiting). | |
856 | * | |
857 | * ret_with_reschedule and work_notifysig are an inner lables of | |
858 | * the ret_from_syscall loop. | |
859 | * | |
860 | * In common to all stack-frame sensitive handlers. | |
861 | * | |
862 | * Inputs: | |
863 | * (SP) struct pt_regs *, original register's frame pointer (basic) | |
864 | * | |
865 | */ | |
866 | .global ret_from_irq | |
867 | ret_from_irq: | |
868 | #ifdef CONFIG_POOR_MANS_STRACE | |
869 | pta evt_debug_ret_from_irq, tr0 | |
870 | ori SP, 0, r2 | |
871 | blink tr0, LINK | |
872 | #endif | |
873 | ld.q SP, FRAME_S(FSSR), r6 | |
874 | shlri r6, 30, r6 | |
875 | andi r6, 1, r6 | |
876 | pta resume_kernel, tr0 | |
877 | bne r6, ZERO, tr0 /* no further checks */ | |
878 | STI() | |
879 | pta ret_with_reschedule, tr0 | |
880 | blink tr0, ZERO /* Do not check softirqs */ | |
881 | ||
882 | .global ret_from_exception | |
883 | ret_from_exception: | |
884 | preempt_stop() | |
885 | ||
886 | #ifdef CONFIG_POOR_MANS_STRACE | |
887 | pta evt_debug_ret_from_exc, tr0 | |
888 | ori SP, 0, r2 | |
889 | blink tr0, LINK | |
890 | #endif | |
891 | ||
892 | ld.q SP, FRAME_S(FSSR), r6 | |
893 | shlri r6, 30, r6 | |
894 | andi r6, 1, r6 | |
895 | pta resume_kernel, tr0 | |
896 | bne r6, ZERO, tr0 /* no further checks */ | |
897 | ||
898 | /* Check softirqs */ | |
899 | ||
900 | #ifdef CONFIG_PREEMPT | |
901 | pta ret_from_syscall, tr0 | |
902 | blink tr0, ZERO | |
903 | ||
904 | resume_kernel: | |
905 | pta restore_all, tr0 | |
906 | ||
907 | getcon KCR0, r6 | |
908 | ld.l r6, TI_PRE_COUNT, r7 | |
909 | beq/u r7, ZERO, tr0 | |
910 | ||
911 | need_resched: | |
912 | ld.l r6, TI_FLAGS, r7 | |
913 | movi (1 << TIF_NEED_RESCHED), r8 | |
914 | and r8, r7, r8 | |
915 | bne r8, ZERO, tr0 | |
916 | ||
917 | getcon SR, r7 | |
918 | andi r7, 0xf0, r7 | |
919 | bne r7, ZERO, tr0 | |
920 | ||
921 | movi ((PREEMPT_ACTIVE >> 16) & 65535), r8 | |
922 | shori (PREEMPT_ACTIVE & 65535), r8 | |
923 | st.l r6, TI_PRE_COUNT, r8 | |
924 | ||
925 | STI() | |
926 | movi schedule, r7 | |
927 | ori r7, 1, r7 | |
928 | ptabs r7, tr1 | |
929 | blink tr1, LINK | |
930 | ||
931 | st.l r6, TI_PRE_COUNT, ZERO | |
932 | CLI() | |
933 | ||
934 | pta need_resched, tr1 | |
935 | blink tr1, ZERO | |
936 | #endif | |
937 | ||
938 | .global ret_from_syscall | |
939 | ret_from_syscall: | |
940 | ||
941 | ret_with_reschedule: | |
942 | getcon KCR0, r6 ! r6 contains current_thread_info | |
943 | ld.l r6, TI_FLAGS, r7 ! r7 contains current_thread_info->flags | |
944 | ||
c18fe9a0 | 945 | movi _TIF_NEED_RESCHED, r8 |
1da177e4 LT |
946 | and r8, r7, r8 |
947 | pta work_resched, tr0 | |
948 | bne r8, ZERO, tr0 | |
949 | ||
950 | pta restore_all, tr1 | |
951 | ||
c18fe9a0 | 952 | movi (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), r8 |
1da177e4 LT |
953 | and r8, r7, r8 |
954 | pta work_notifysig, tr0 | |
955 | bne r8, ZERO, tr0 | |
956 | ||
957 | blink tr1, ZERO | |
958 | ||
959 | work_resched: | |
960 | pta ret_from_syscall, tr0 | |
961 | gettr tr0, LINK | |
962 | movi schedule, r6 | |
963 | ptabs r6, tr0 | |
964 | blink tr0, ZERO /* Call schedule(), return on top */ | |
965 | ||
966 | work_notifysig: | |
967 | gettr tr1, LINK | |
968 | ||
969 | movi do_signal, r6 | |
970 | ptabs r6, tr0 | |
971 | or SP, ZERO, r2 | |
972 | or ZERO, ZERO, r3 | |
973 | blink tr0, LINK /* Call do_signal(regs, 0), return here */ | |
974 | ||
975 | restore_all: | |
976 | /* Do prefetches */ | |
977 | ||
978 | ld.q SP, FRAME_T(0), r6 | |
979 | ld.q SP, FRAME_T(1), r7 | |
980 | ld.q SP, FRAME_T(2), r8 | |
981 | ld.q SP, FRAME_T(3), r9 | |
982 | ptabs r6, tr0 | |
983 | ptabs r7, tr1 | |
984 | ptabs r8, tr2 | |
985 | ptabs r9, tr3 | |
986 | ld.q SP, FRAME_T(4), r6 | |
987 | ld.q SP, FRAME_T(5), r7 | |
988 | ld.q SP, FRAME_T(6), r8 | |
989 | ld.q SP, FRAME_T(7), r9 | |
990 | ptabs r6, tr4 | |
991 | ptabs r7, tr5 | |
992 | ptabs r8, tr6 | |
993 | ptabs r9, tr7 | |
994 | ||
995 | ld.q SP, FRAME_R(0), r0 | |
996 | ld.q SP, FRAME_R(1), r1 | |
997 | ld.q SP, FRAME_R(2), r2 | |
998 | ld.q SP, FRAME_R(3), r3 | |
999 | ld.q SP, FRAME_R(4), r4 | |
1000 | ld.q SP, FRAME_R(5), r5 | |
1001 | ld.q SP, FRAME_R(6), r6 | |
1002 | ld.q SP, FRAME_R(7), r7 | |
1003 | ld.q SP, FRAME_R(8), r8 | |
1004 | ld.q SP, FRAME_R(9), r9 | |
1005 | ld.q SP, FRAME_R(10), r10 | |
1006 | ld.q SP, FRAME_R(11), r11 | |
1007 | ld.q SP, FRAME_R(12), r12 | |
1008 | ld.q SP, FRAME_R(13), r13 | |
1009 | ld.q SP, FRAME_R(14), r14 | |
1010 | ||
1011 | ld.q SP, FRAME_R(16), r16 | |
1012 | ld.q SP, FRAME_R(17), r17 | |
1013 | ld.q SP, FRAME_R(18), r18 | |
1014 | ld.q SP, FRAME_R(19), r19 | |
1015 | ld.q SP, FRAME_R(20), r20 | |
1016 | ld.q SP, FRAME_R(21), r21 | |
1017 | ld.q SP, FRAME_R(22), r22 | |
1018 | ld.q SP, FRAME_R(23), r23 | |
1019 | ld.q SP, FRAME_R(24), r24 | |
1020 | ld.q SP, FRAME_R(25), r25 | |
1021 | ld.q SP, FRAME_R(26), r26 | |
1022 | ld.q SP, FRAME_R(27), r27 | |
1023 | ld.q SP, FRAME_R(28), r28 | |
1024 | ld.q SP, FRAME_R(29), r29 | |
1025 | ld.q SP, FRAME_R(30), r30 | |
1026 | ld.q SP, FRAME_R(31), r31 | |
1027 | ld.q SP, FRAME_R(32), r32 | |
1028 | ld.q SP, FRAME_R(33), r33 | |
1029 | ld.q SP, FRAME_R(34), r34 | |
1030 | ld.q SP, FRAME_R(35), r35 | |
1031 | ld.q SP, FRAME_R(36), r36 | |
1032 | ld.q SP, FRAME_R(37), r37 | |
1033 | ld.q SP, FRAME_R(38), r38 | |
1034 | ld.q SP, FRAME_R(39), r39 | |
1035 | ld.q SP, FRAME_R(40), r40 | |
1036 | ld.q SP, FRAME_R(41), r41 | |
1037 | ld.q SP, FRAME_R(42), r42 | |
1038 | ld.q SP, FRAME_R(43), r43 | |
1039 | ld.q SP, FRAME_R(44), r44 | |
1040 | ld.q SP, FRAME_R(45), r45 | |
1041 | ld.q SP, FRAME_R(46), r46 | |
1042 | ld.q SP, FRAME_R(47), r47 | |
1043 | ld.q SP, FRAME_R(48), r48 | |
1044 | ld.q SP, FRAME_R(49), r49 | |
1045 | ld.q SP, FRAME_R(50), r50 | |
1046 | ld.q SP, FRAME_R(51), r51 | |
1047 | ld.q SP, FRAME_R(52), r52 | |
1048 | ld.q SP, FRAME_R(53), r53 | |
1049 | ld.q SP, FRAME_R(54), r54 | |
1050 | ld.q SP, FRAME_R(55), r55 | |
1051 | ld.q SP, FRAME_R(56), r56 | |
1052 | ld.q SP, FRAME_R(57), r57 | |
1053 | ld.q SP, FRAME_R(58), r58 | |
1054 | ||
1055 | getcon SR, r59 | |
1056 | movi SR_BLOCK_EXC, r60 | |
1057 | or r59, r60, r59 | |
1058 | putcon r59, SR /* SR.BL = 1, keep nesting out */ | |
1059 | ld.q SP, FRAME_S(FSSR), r61 | |
1060 | ld.q SP, FRAME_S(FSPC), r62 | |
1061 | movi SR_ASID_MASK, r60 | |
1062 | and r59, r60, r59 | |
1063 | andc r61, r60, r61 /* Clear out older ASID */ | |
1064 | or r59, r61, r61 /* Retain current ASID */ | |
1065 | putcon r61, SSR | |
1066 | putcon r62, SPC | |
1067 | ||
1068 | /* Ignore FSYSCALL_ID */ | |
1069 | ||
1070 | ld.q SP, FRAME_R(59), r59 | |
1071 | ld.q SP, FRAME_R(60), r60 | |
1072 | ld.q SP, FRAME_R(61), r61 | |
1073 | ld.q SP, FRAME_R(62), r62 | |
1074 | ||
1075 | /* Last touch */ | |
1076 | ld.q SP, FRAME_R(15), SP | |
1077 | rte | |
1078 | nop | |
1079 | ||
1080 | /* | |
1081 | * Third level handlers for VBR-based exceptions. Adapting args to | |
1082 | * and/or deflecting to fourth level handlers. | |
1083 | * | |
1084 | * Fourth level handlers interface. | |
1085 | * Most are C-coded handlers directly pointed by the trap_jtable. | |
1086 | * (Third = Fourth level) | |
1087 | * Inputs: | |
1088 | * (r2) fault/interrupt code, entry number (e.g. NMI = 14, | |
1089 | * IRL0-3 (0000) = 16, RTLBMISS = 2, SYSCALL = 11, etc ...) | |
1090 | * (r3) struct pt_regs *, original register's frame pointer | |
1091 | * (r4) Event (0 = interrupt, 1 = TLB miss fault, 2 = Not TLB miss fault) | |
1092 | * (r5) TRA control register (for syscall/debug benefit only) | |
1093 | * (LINK) return address | |
1094 | * (SP) = r3 | |
1095 | * | |
1096 | * Kernel TLB fault handlers will get a slightly different interface. | |
1097 | * (r2) struct pt_regs *, original register's frame pointer | |
1098 | * (r3) writeaccess, whether it's a store fault as opposed to load fault | |
1099 | * (r4) execaccess, whether it's a ITLB fault as opposed to DTLB fault | |
1100 | * (r5) Effective Address of fault | |
1101 | * (LINK) return address | |
1102 | * (SP) = r2 | |
1103 | * | |
1104 | * fpu_error_or_IRQ? is a helper to deflect to the right cause. | |
1105 | * | |
1106 | */ | |
1107 | tlb_miss_load: | |
1108 | or SP, ZERO, r2 | |
1109 | or ZERO, ZERO, r3 /* Read */ | |
1110 | or ZERO, ZERO, r4 /* Data */ | |
1111 | getcon TEA, r5 | |
1112 | pta call_do_page_fault, tr0 | |
1113 | beq ZERO, ZERO, tr0 | |
1114 | ||
1115 | tlb_miss_store: | |
1116 | or SP, ZERO, r2 | |
1117 | movi 1, r3 /* Write */ | |
1118 | or ZERO, ZERO, r4 /* Data */ | |
1119 | getcon TEA, r5 | |
1120 | pta call_do_page_fault, tr0 | |
1121 | beq ZERO, ZERO, tr0 | |
1122 | ||
1123 | itlb_miss_or_IRQ: | |
1124 | pta its_IRQ, tr0 | |
1125 | beqi/u r4, EVENT_INTERRUPT, tr0 | |
1126 | or SP, ZERO, r2 | |
1127 | or ZERO, ZERO, r3 /* Read */ | |
1128 | movi 1, r4 /* Text */ | |
1129 | getcon TEA, r5 | |
1130 | /* Fall through */ | |
1131 | ||
1132 | call_do_page_fault: | |
1133 | movi do_page_fault, r6 | |
1134 | ptabs r6, tr0 | |
1135 | blink tr0, ZERO | |
1136 | ||
1137 | fpu_error_or_IRQA: | |
1138 | pta its_IRQ, tr0 | |
1139 | beqi/l r4, EVENT_INTERRUPT, tr0 | |
1140 | #ifdef CONFIG_SH_FPU | |
1141 | movi do_fpu_state_restore, r6 | |
1142 | #else | |
1143 | movi do_exception_error, r6 | |
1144 | #endif | |
1145 | ptabs r6, tr0 | |
1146 | blink tr0, ZERO | |
1147 | ||
1148 | fpu_error_or_IRQB: | |
1149 | pta its_IRQ, tr0 | |
1150 | beqi/l r4, EVENT_INTERRUPT, tr0 | |
1151 | #ifdef CONFIG_SH_FPU | |
1152 | movi do_fpu_state_restore, r6 | |
1153 | #else | |
1154 | movi do_exception_error, r6 | |
1155 | #endif | |
1156 | ptabs r6, tr0 | |
1157 | blink tr0, ZERO | |
1158 | ||
1159 | its_IRQ: | |
1160 | movi do_IRQ, r6 | |
1161 | ptabs r6, tr0 | |
1162 | blink tr0, ZERO | |
1163 | ||
1164 | /* | |
1165 | * system_call/unknown_trap third level handler: | |
1166 | * | |
1167 | * Inputs: | |
1168 | * (r2) fault/interrupt code, entry number (TRAP = 11) | |
1169 | * (r3) struct pt_regs *, original register's frame pointer | |
1170 | * (r4) Not used. Event (0=interrupt, 1=TLB miss fault, 2=Not TLB miss fault) | |
1171 | * (r5) TRA Control Reg (0x00xyzzzz: x=1 SYSCALL, y = #args, z=nr) | |
1172 | * (SP) = r3 | |
1173 | * (LINK) return address: ret_from_exception | |
1174 | * (*r3) Syscall parms: SC#, arg0, arg1, ..., arg5 in order (Saved r2/r7) | |
1175 | * | |
1176 | * Outputs: | |
1177 | * (*r3) Syscall reply (Saved r2) | |
1178 | * (LINK) In case of syscall only it can be scrapped. | |
1179 | * Common second level post handler will be ret_from_syscall. | |
1180 | * Common (non-trace) exit point to that is syscall_ret (saving | |
1181 | * result to r2). Common bad exit point is syscall_bad (returning | |
1182 | * ENOSYS then saved to r2). | |
1183 | * | |
1184 | */ | |
1185 | ||
1186 | unknown_trap: | |
1187 | /* Unknown Trap or User Trace */ | |
1188 | movi do_unknown_trapa, r6 | |
1189 | ptabs r6, tr0 | |
1190 | ld.q r3, FRAME_R(9), r2 /* r2 = #arg << 16 | syscall # */ | |
1191 | andi r2, 0x1ff, r2 /* r2 = syscall # */ | |
1192 | blink tr0, LINK | |
1193 | ||
1194 | pta syscall_ret, tr0 | |
1195 | blink tr0, ZERO | |
1196 | ||
1197 | /* New syscall implementation*/ | |
1198 | system_call: | |
1199 | pta unknown_trap, tr0 | |
1200 | or r5, ZERO, r4 /* TRA (=r5) -> r4 */ | |
1201 | shlri r4, 20, r4 | |
1202 | bnei r4, 1, tr0 /* unknown_trap if not 0x1yzzzz */ | |
1203 | ||
1204 | /* It's a system call */ | |
1205 | st.q r3, FRAME_S(FSYSCALL_ID), r5 /* ID (0x1yzzzz) -> stack */ | |
1206 | andi r5, 0x1ff, r5 /* syscall # -> r5 */ | |
1207 | ||
1208 | STI() | |
1209 | ||
1210 | pta syscall_allowed, tr0 | |
1211 | movi NR_syscalls - 1, r4 /* Last valid */ | |
1212 | bgeu/l r4, r5, tr0 | |
1213 | ||
1214 | syscall_bad: | |
1215 | /* Return ENOSYS ! */ | |
1216 | movi -(ENOSYS), r2 /* Fall-through */ | |
1217 | ||
1218 | .global syscall_ret | |
1219 | syscall_ret: | |
1220 | st.q SP, FRAME_R(9), r2 /* Expecting SP back to BASIC frame */ | |
1221 | ||
1222 | #ifdef CONFIG_POOR_MANS_STRACE | |
1223 | /* nothing useful in registers at this point */ | |
1224 | ||
1225 | movi evt_debug2, r5 | |
1226 | ori r5, 1, r5 | |
1227 | ptabs r5, tr0 | |
1228 | ld.q SP, FRAME_R(9), r2 | |
1229 | or SP, ZERO, r3 | |
1230 | blink tr0, LINK | |
1231 | #endif | |
1232 | ||
1233 | ld.q SP, FRAME_S(FSPC), r2 | |
1234 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
1235 | st.q SP, FRAME_S(FSPC), r2 | |
1236 | pta ret_from_syscall, tr0 | |
1237 | blink tr0, ZERO | |
1238 | ||
1239 | ||
1240 | /* A different return path for ret_from_fork, because we now need | |
1241 | * to call schedule_tail with the later kernels. Because prev is | |
1242 | * loaded into r2 by switch_to() means we can just call it straight away | |
1243 | */ | |
1244 | ||
1245 | .global ret_from_fork | |
1246 | ret_from_fork: | |
1247 | ||
1248 | movi schedule_tail,r5 | |
1249 | ori r5, 1, r5 | |
1250 | ptabs r5, tr0 | |
1251 | blink tr0, LINK | |
1252 | ||
1253 | #ifdef CONFIG_POOR_MANS_STRACE | |
1254 | /* nothing useful in registers at this point */ | |
1255 | ||
1256 | movi evt_debug2, r5 | |
1257 | ori r5, 1, r5 | |
1258 | ptabs r5, tr0 | |
1259 | ld.q SP, FRAME_R(9), r2 | |
1260 | or SP, ZERO, r3 | |
1261 | blink tr0, LINK | |
1262 | #endif | |
1263 | ||
1264 | ld.q SP, FRAME_S(FSPC), r2 | |
1265 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
1266 | st.q SP, FRAME_S(FSPC), r2 | |
1267 | pta ret_from_syscall, tr0 | |
1268 | blink tr0, ZERO | |
1269 | ||
1270 | ||
1271 | ||
1272 | syscall_allowed: | |
1273 | /* Use LINK to deflect the exit point, default is syscall_ret */ | |
1274 | pta syscall_ret, tr0 | |
1275 | gettr tr0, LINK | |
1276 | pta syscall_notrace, tr0 | |
1277 | ||
1278 | getcon KCR0, r2 | |
1279 | ld.l r2, TI_FLAGS, r4 | |
4b27c47c | 1280 | movi (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | _TIF_SYSCALL_AUDIT), r6 |
1da177e4 LT |
1281 | and r6, r4, r6 |
1282 | beq/l r6, ZERO, tr0 | |
1283 | ||
1284 | /* Trace it by calling syscall_trace before and after */ | |
1285 | movi syscall_trace, r4 | |
4b27c47c PM |
1286 | or SP, ZERO, r2 |
1287 | or ZERO, ZERO, r3 | |
1da177e4 LT |
1288 | ptabs r4, tr0 |
1289 | blink tr0, LINK | |
4b27c47c | 1290 | |
1da177e4 LT |
1291 | /* Reload syscall number as r5 is trashed by syscall_trace */ |
1292 | ld.q SP, FRAME_S(FSYSCALL_ID), r5 | |
1293 | andi r5, 0x1ff, r5 | |
1294 | ||
1295 | pta syscall_ret_trace, tr0 | |
1296 | gettr tr0, LINK | |
1297 | ||
1298 | syscall_notrace: | |
1299 | /* Now point to the appropriate 4th level syscall handler */ | |
1300 | movi sys_call_table, r4 | |
1301 | shlli r5, 2, r5 | |
1302 | ldx.l r4, r5, r5 | |
1303 | ptabs r5, tr0 | |
1304 | ||
1305 | /* Prepare original args */ | |
1306 | ld.q SP, FRAME_R(2), r2 | |
1307 | ld.q SP, FRAME_R(3), r3 | |
1308 | ld.q SP, FRAME_R(4), r4 | |
1309 | ld.q SP, FRAME_R(5), r5 | |
1310 | ld.q SP, FRAME_R(6), r6 | |
1311 | ld.q SP, FRAME_R(7), r7 | |
1312 | ||
1313 | /* And now the trick for those syscalls requiring regs * ! */ | |
1314 | or SP, ZERO, r8 | |
1315 | ||
1316 | /* Call it */ | |
1317 | blink tr0, ZERO /* LINK is already properly set */ | |
1318 | ||
1319 | syscall_ret_trace: | |
1320 | /* We get back here only if under trace */ | |
1321 | st.q SP, FRAME_R(9), r2 /* Save return value */ | |
1322 | ||
1323 | movi syscall_trace, LINK | |
4b27c47c PM |
1324 | or SP, ZERO, r2 |
1325 | movi 1, r3 | |
1da177e4 LT |
1326 | ptabs LINK, tr0 |
1327 | blink tr0, LINK | |
1328 | ||
1329 | /* This needs to be done after any syscall tracing */ | |
1330 | ld.q SP, FRAME_S(FSPC), r2 | |
1331 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
1332 | st.q SP, FRAME_S(FSPC), r2 | |
1333 | ||
1334 | pta ret_from_syscall, tr0 | |
1335 | blink tr0, ZERO /* Resume normal return sequence */ | |
1336 | ||
1337 | /* | |
1338 | * --- Switch to running under a particular ASID and return the previous ASID value | |
1339 | * --- The caller is assumed to have done a cli before calling this. | |
1340 | * | |
1341 | * Input r2 : new ASID | |
1342 | * Output r2 : old ASID | |
1343 | */ | |
1344 | ||
1345 | .global switch_and_save_asid | |
1346 | switch_and_save_asid: | |
1347 | getcon sr, r0 | |
1348 | movi 255, r4 | |
1349 | shlli r4, 16, r4 /* r4 = mask to select ASID */ | |
1350 | and r0, r4, r3 /* r3 = shifted old ASID */ | |
1351 | andi r2, 255, r2 /* mask down new ASID */ | |
1352 | shlli r2, 16, r2 /* align new ASID against SR.ASID */ | |
1353 | andc r0, r4, r0 /* efface old ASID from SR */ | |
1354 | or r0, r2, r0 /* insert the new ASID */ | |
1355 | putcon r0, ssr | |
1356 | movi 1f, r0 | |
1357 | putcon r0, spc | |
1358 | rte | |
1359 | nop | |
1360 | 1: | |
1361 | ptabs LINK, tr0 | |
1362 | shlri r3, 16, r2 /* r2 = old ASID */ | |
1363 | blink tr0, r63 | |
1364 | ||
1365 | .global route_to_panic_handler | |
1366 | route_to_panic_handler: | |
1367 | /* Switch to real mode, goto panic_handler, don't return. Useful for | |
1368 | last-chance debugging, e.g. if no output wants to go to the console. | |
1369 | */ | |
1370 | ||
36763b22 | 1371 | movi panic_handler - CONFIG_PAGE_OFFSET, r1 |
1da177e4 LT |
1372 | ptabs r1, tr0 |
1373 | pta 1f, tr1 | |
1374 | gettr tr1, r0 | |
1375 | putcon r0, spc | |
1376 | getcon sr, r0 | |
1377 | movi 1, r1 | |
1378 | shlli r1, 31, r1 | |
1379 | andc r0, r1, r0 | |
1380 | putcon r0, ssr | |
1381 | rte | |
1382 | nop | |
1383 | 1: /* Now in real mode */ | |
1384 | blink tr0, r63 | |
1385 | nop | |
1386 | ||
1387 | .global peek_real_address_q | |
1388 | peek_real_address_q: | |
1389 | /* Two args: | |
1390 | r2 : real mode address to peek | |
1391 | r2(out) : result quadword | |
1392 | ||
1393 | This is provided as a cheapskate way of manipulating device | |
1394 | registers for debugging (to avoid the need to onchip_remap the debug | |
1395 | module, and to avoid the need to onchip_remap the watchpoint | |
1396 | controller in a way that identity maps sufficient bits to avoid the | |
1397 | SH5-101 cut2 silicon defect). | |
1398 | ||
1399 | This code is not performance critical | |
1400 | */ | |
1401 | ||
1402 | add.l r2, r63, r2 /* sign extend address */ | |
1403 | getcon sr, r0 /* r0 = saved original SR */ | |
1404 | movi 1, r1 | |
1405 | shlli r1, 28, r1 | |
1406 | or r0, r1, r1 /* r0 with block bit set */ | |
1407 | putcon r1, sr /* now in critical section */ | |
1408 | movi 1, r36 | |
1409 | shlli r36, 31, r36 | |
1410 | andc r1, r36, r1 /* turn sr.mmu off in real mode section */ | |
1411 | ||
1412 | putcon r1, ssr | |
36763b22 | 1413 | movi .peek0 - CONFIG_PAGE_OFFSET, r36 /* real mode target address */ |
1da177e4 LT |
1414 | movi 1f, r37 /* virtual mode return addr */ |
1415 | putcon r36, spc | |
1416 | ||
1417 | synco | |
1418 | rte | |
1419 | nop | |
1420 | ||
1421 | .peek0: /* come here in real mode, don't touch caches!! | |
1422 | still in critical section (sr.bl==1) */ | |
1423 | putcon r0, ssr | |
1424 | putcon r37, spc | |
1425 | /* Here's the actual peek. If the address is bad, all bets are now off | |
1426 | * what will happen (handlers invoked in real-mode = bad news) */ | |
1427 | ld.q r2, 0, r2 | |
1428 | synco | |
1429 | rte /* Back to virtual mode */ | |
1430 | nop | |
1431 | ||
1432 | 1: | |
1433 | ptabs LINK, tr0 | |
1434 | blink tr0, r63 | |
1435 | ||
1436 | .global poke_real_address_q | |
1437 | poke_real_address_q: | |
1438 | /* Two args: | |
1439 | r2 : real mode address to poke | |
1440 | r3 : quadword value to write. | |
1441 | ||
1442 | This is provided as a cheapskate way of manipulating device | |
1443 | registers for debugging (to avoid the need to onchip_remap the debug | |
1444 | module, and to avoid the need to onchip_remap the watchpoint | |
1445 | controller in a way that identity maps sufficient bits to avoid the | |
1446 | SH5-101 cut2 silicon defect). | |
1447 | ||
1448 | This code is not performance critical | |
1449 | */ | |
1450 | ||
1451 | add.l r2, r63, r2 /* sign extend address */ | |
1452 | getcon sr, r0 /* r0 = saved original SR */ | |
1453 | movi 1, r1 | |
1454 | shlli r1, 28, r1 | |
1455 | or r0, r1, r1 /* r0 with block bit set */ | |
1456 | putcon r1, sr /* now in critical section */ | |
1457 | movi 1, r36 | |
1458 | shlli r36, 31, r36 | |
1459 | andc r1, r36, r1 /* turn sr.mmu off in real mode section */ | |
1460 | ||
1461 | putcon r1, ssr | |
36763b22 | 1462 | movi .poke0-CONFIG_PAGE_OFFSET, r36 /* real mode target address */ |
1da177e4 LT |
1463 | movi 1f, r37 /* virtual mode return addr */ |
1464 | putcon r36, spc | |
1465 | ||
1466 | synco | |
1467 | rte | |
1468 | nop | |
1469 | ||
1470 | .poke0: /* come here in real mode, don't touch caches!! | |
1471 | still in critical section (sr.bl==1) */ | |
1472 | putcon r0, ssr | |
1473 | putcon r37, spc | |
1474 | /* Here's the actual poke. If the address is bad, all bets are now off | |
1475 | * what will happen (handlers invoked in real-mode = bad news) */ | |
1476 | st.q r2, 0, r3 | |
1477 | synco | |
1478 | rte /* Back to virtual mode */ | |
1479 | nop | |
1480 | ||
1481 | 1: | |
1482 | ptabs LINK, tr0 | |
1483 | blink tr0, r63 | |
1484 | ||
1485 | /* | |
1486 | * --- User Access Handling Section | |
1487 | */ | |
1488 | ||
1489 | /* | |
1490 | * User Access support. It all moved to non inlined Assembler | |
1491 | * functions in here. | |
1492 | * | |
1493 | * __kernel_size_t __copy_user(void *__to, const void *__from, | |
1494 | * __kernel_size_t __n) | |
1495 | * | |
1496 | * Inputs: | |
1497 | * (r2) target address | |
1498 | * (r3) source address | |
1499 | * (r4) size in bytes | |
1500 | * | |
1501 | * Ouputs: | |
1502 | * (*r2) target data | |
1503 | * (r2) non-copied bytes | |
1504 | * | |
1505 | * If a fault occurs on the user pointer, bail out early and return the | |
1506 | * number of bytes not copied in r2. | |
1507 | * Strategy : for large blocks, call a real memcpy function which can | |
1508 | * move >1 byte at a time using unaligned ld/st instructions, and can | |
1509 | * manipulate the cache using prefetch + alloco to improve the speed | |
1510 | * further. If a fault occurs in that function, just revert to the | |
1511 | * byte-by-byte approach used for small blocks; this is rare so the | |
1512 | * performance hit for that case does not matter. | |
1513 | * | |
1514 | * For small blocks it's not worth the overhead of setting up and calling | |
1515 | * the memcpy routine; do the copy a byte at a time. | |
1516 | * | |
1517 | */ | |
1518 | .global __copy_user | |
1519 | __copy_user: | |
1520 | pta __copy_user_byte_by_byte, tr1 | |
1521 | movi 16, r0 ! this value is a best guess, should tune it by benchmarking | |
1522 | bge/u r0, r4, tr1 | |
1523 | pta copy_user_memcpy, tr0 | |
1524 | addi SP, -32, SP | |
1525 | /* Save arguments in case we have to fix-up unhandled page fault */ | |
1526 | st.q SP, 0, r2 | |
1527 | st.q SP, 8, r3 | |
1528 | st.q SP, 16, r4 | |
1529 | st.q SP, 24, r35 ! r35 is callee-save | |
1530 | /* Save LINK in a register to reduce RTS time later (otherwise | |
1531 | ld SP,*,LINK;ptabs LINK;trn;blink trn,r63 becomes a critical path) */ | |
1532 | ori LINK, 0, r35 | |
1533 | blink tr0, LINK | |
1534 | ||
1535 | /* Copy completed normally if we get back here */ | |
1536 | ptabs r35, tr0 | |
1537 | ld.q SP, 24, r35 | |
1538 | /* don't restore r2-r4, pointless */ | |
1539 | /* set result=r2 to zero as the copy must have succeeded. */ | |
1540 | or r63, r63, r2 | |
1541 | addi SP, 32, SP | |
1542 | blink tr0, r63 ! RTS | |
1543 | ||
1544 | .global __copy_user_fixup | |
1545 | __copy_user_fixup: | |
1546 | /* Restore stack frame */ | |
1547 | ori r35, 0, LINK | |
1548 | ld.q SP, 24, r35 | |
1549 | ld.q SP, 16, r4 | |
1550 | ld.q SP, 8, r3 | |
1551 | ld.q SP, 0, r2 | |
1552 | addi SP, 32, SP | |
1553 | /* Fall through to original code, in the 'same' state we entered with */ | |
1554 | ||
1555 | /* The slow byte-by-byte method is used if the fast copy traps due to a bad | |
1556 | user address. In that rare case, the speed drop can be tolerated. */ | |
1557 | __copy_user_byte_by_byte: | |
1558 | pta ___copy_user_exit, tr1 | |
1559 | pta ___copy_user1, tr0 | |
1560 | beq/u r4, r63, tr1 /* early exit for zero length copy */ | |
1561 | sub r2, r3, r0 | |
1562 | addi r0, -1, r0 | |
1563 | ||
1564 | ___copy_user1: | |
1565 | ld.b r3, 0, r5 /* Fault address 1 */ | |
1566 | ||
1567 | /* Could rewrite this to use just 1 add, but the second comes 'free' | |
1568 | due to load latency */ | |
1569 | addi r3, 1, r3 | |
1570 | addi r4, -1, r4 /* No real fixup required */ | |
1571 | ___copy_user2: | |
1572 | stx.b r3, r0, r5 /* Fault address 2 */ | |
1573 | bne r4, ZERO, tr0 | |
1574 | ||
1575 | ___copy_user_exit: | |
1576 | or r4, ZERO, r2 | |
1577 | ptabs LINK, tr0 | |
1578 | blink tr0, ZERO | |
1579 | ||
1580 | /* | |
1581 | * __kernel_size_t __clear_user(void *addr, __kernel_size_t size) | |
1582 | * | |
1583 | * Inputs: | |
1584 | * (r2) target address | |
1585 | * (r3) size in bytes | |
1586 | * | |
1587 | * Ouputs: | |
1588 | * (*r2) zero-ed target data | |
1589 | * (r2) non-zero-ed bytes | |
1590 | */ | |
1591 | .global __clear_user | |
1592 | __clear_user: | |
1593 | pta ___clear_user_exit, tr1 | |
1594 | pta ___clear_user1, tr0 | |
1595 | beq/u r3, r63, tr1 | |
1596 | ||
1597 | ___clear_user1: | |
1598 | st.b r2, 0, ZERO /* Fault address */ | |
1599 | addi r2, 1, r2 | |
1600 | addi r3, -1, r3 /* No real fixup required */ | |
1601 | bne r3, ZERO, tr0 | |
1602 | ||
1603 | ___clear_user_exit: | |
1604 | or r3, ZERO, r2 | |
1605 | ptabs LINK, tr0 | |
1606 | blink tr0, ZERO | |
1607 | ||
1608 | ||
1609 | /* | |
1610 | * int __strncpy_from_user(unsigned long __dest, unsigned long __src, | |
1611 | * int __count) | |
1612 | * | |
1613 | * Inputs: | |
1614 | * (r2) target address | |
1615 | * (r3) source address | |
1616 | * (r4) maximum size in bytes | |
1617 | * | |
1618 | * Ouputs: | |
1619 | * (*r2) copied data | |
1620 | * (r2) -EFAULT (in case of faulting) | |
1621 | * copied data (otherwise) | |
1622 | */ | |
1623 | .global __strncpy_from_user | |
1624 | __strncpy_from_user: | |
1625 | pta ___strncpy_from_user1, tr0 | |
1626 | pta ___strncpy_from_user_done, tr1 | |
1627 | or r4, ZERO, r5 /* r5 = original count */ | |
1628 | beq/u r4, r63, tr1 /* early exit if r4==0 */ | |
1629 | movi -(EFAULT), r6 /* r6 = reply, no real fixup */ | |
1630 | or ZERO, ZERO, r7 /* r7 = data, clear top byte of data */ | |
1631 | ||
1632 | ___strncpy_from_user1: | |
1633 | ld.b r3, 0, r7 /* Fault address: only in reading */ | |
1634 | st.b r2, 0, r7 | |
1635 | addi r2, 1, r2 | |
1636 | addi r3, 1, r3 | |
1637 | beq/u ZERO, r7, tr1 | |
1638 | addi r4, -1, r4 /* return real number of copied bytes */ | |
1639 | bne/l ZERO, r4, tr0 | |
1640 | ||
1641 | ___strncpy_from_user_done: | |
1642 | sub r5, r4, r6 /* If done, return copied */ | |
1643 | ||
1644 | ___strncpy_from_user_exit: | |
1645 | or r6, ZERO, r2 | |
1646 | ptabs LINK, tr0 | |
1647 | blink tr0, ZERO | |
1648 | ||
1649 | /* | |
1650 | * extern long __strnlen_user(const char *__s, long __n) | |
1651 | * | |
1652 | * Inputs: | |
1653 | * (r2) source address | |
1654 | * (r3) source size in bytes | |
1655 | * | |
1656 | * Ouputs: | |
1657 | * (r2) -EFAULT (in case of faulting) | |
1658 | * string length (otherwise) | |
1659 | */ | |
1660 | .global __strnlen_user | |
1661 | __strnlen_user: | |
1662 | pta ___strnlen_user_set_reply, tr0 | |
1663 | pta ___strnlen_user1, tr1 | |
1664 | or ZERO, ZERO, r5 /* r5 = counter */ | |
1665 | movi -(EFAULT), r6 /* r6 = reply, no real fixup */ | |
1666 | or ZERO, ZERO, r7 /* r7 = data, clear top byte of data */ | |
1667 | beq r3, ZERO, tr0 | |
1668 | ||
1669 | ___strnlen_user1: | |
1670 | ldx.b r2, r5, r7 /* Fault address: only in reading */ | |
1671 | addi r3, -1, r3 /* No real fixup */ | |
1672 | addi r5, 1, r5 | |
1673 | beq r3, ZERO, tr0 | |
1674 | bne r7, ZERO, tr1 | |
1675 | ! The line below used to be active. This meant led to a junk byte lying between each pair | |
1676 | ! of entries in the argv & envp structures in memory. Whilst the program saw the right data | |
1677 | ! via the argv and envp arguments to main, it meant the 'flat' representation visible through | |
1678 | ! /proc/$pid/cmdline was corrupt, causing trouble with ps, for example. | |
1679 | ! addi r5, 1, r5 /* Include '\0' */ | |
1680 | ||
1681 | ___strnlen_user_set_reply: | |
1682 | or r5, ZERO, r6 /* If done, return counter */ | |
1683 | ||
1684 | ___strnlen_user_exit: | |
1685 | or r6, ZERO, r2 | |
1686 | ptabs LINK, tr0 | |
1687 | blink tr0, ZERO | |
1688 | ||
1689 | /* | |
1690 | * extern long __get_user_asm_?(void *val, long addr) | |
1691 | * | |
1692 | * Inputs: | |
1693 | * (r2) dest address | |
1694 | * (r3) source address (in User Space) | |
1695 | * | |
1696 | * Ouputs: | |
1697 | * (r2) -EFAULT (faulting) | |
1698 | * 0 (not faulting) | |
1699 | */ | |
1700 | .global __get_user_asm_b | |
1701 | __get_user_asm_b: | |
1702 | or r2, ZERO, r4 | |
1703 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1704 | ||
1705 | ___get_user_asm_b1: | |
1706 | ld.b r3, 0, r5 /* r5 = data */ | |
1707 | st.b r4, 0, r5 | |
1708 | or ZERO, ZERO, r2 | |
1709 | ||
1710 | ___get_user_asm_b_exit: | |
1711 | ptabs LINK, tr0 | |
1712 | blink tr0, ZERO | |
1713 | ||
1714 | ||
1715 | .global __get_user_asm_w | |
1716 | __get_user_asm_w: | |
1717 | or r2, ZERO, r4 | |
1718 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1719 | ||
1720 | ___get_user_asm_w1: | |
1721 | ld.w r3, 0, r5 /* r5 = data */ | |
1722 | st.w r4, 0, r5 | |
1723 | or ZERO, ZERO, r2 | |
1724 | ||
1725 | ___get_user_asm_w_exit: | |
1726 | ptabs LINK, tr0 | |
1727 | blink tr0, ZERO | |
1728 | ||
1729 | ||
1730 | .global __get_user_asm_l | |
1731 | __get_user_asm_l: | |
1732 | or r2, ZERO, r4 | |
1733 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1734 | ||
1735 | ___get_user_asm_l1: | |
1736 | ld.l r3, 0, r5 /* r5 = data */ | |
1737 | st.l r4, 0, r5 | |
1738 | or ZERO, ZERO, r2 | |
1739 | ||
1740 | ___get_user_asm_l_exit: | |
1741 | ptabs LINK, tr0 | |
1742 | blink tr0, ZERO | |
1743 | ||
1744 | ||
1745 | .global __get_user_asm_q | |
1746 | __get_user_asm_q: | |
1747 | or r2, ZERO, r4 | |
1748 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1749 | ||
1750 | ___get_user_asm_q1: | |
1751 | ld.q r3, 0, r5 /* r5 = data */ | |
1752 | st.q r4, 0, r5 | |
1753 | or ZERO, ZERO, r2 | |
1754 | ||
1755 | ___get_user_asm_q_exit: | |
1756 | ptabs LINK, tr0 | |
1757 | blink tr0, ZERO | |
1758 | ||
1759 | /* | |
1760 | * extern long __put_user_asm_?(void *pval, long addr) | |
1761 | * | |
1762 | * Inputs: | |
1763 | * (r2) kernel pointer to value | |
1764 | * (r3) dest address (in User Space) | |
1765 | * | |
1766 | * Ouputs: | |
1767 | * (r2) -EFAULT (faulting) | |
1768 | * 0 (not faulting) | |
1769 | */ | |
1770 | .global __put_user_asm_b | |
1771 | __put_user_asm_b: | |
1772 | ld.b r2, 0, r4 /* r4 = data */ | |
1773 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1774 | ||
1775 | ___put_user_asm_b1: | |
1776 | st.b r3, 0, r4 | |
1777 | or ZERO, ZERO, r2 | |
1778 | ||
1779 | ___put_user_asm_b_exit: | |
1780 | ptabs LINK, tr0 | |
1781 | blink tr0, ZERO | |
1782 | ||
1783 | ||
1784 | .global __put_user_asm_w | |
1785 | __put_user_asm_w: | |
1786 | ld.w r2, 0, r4 /* r4 = data */ | |
1787 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1788 | ||
1789 | ___put_user_asm_w1: | |
1790 | st.w r3, 0, r4 | |
1791 | or ZERO, ZERO, r2 | |
1792 | ||
1793 | ___put_user_asm_w_exit: | |
1794 | ptabs LINK, tr0 | |
1795 | blink tr0, ZERO | |
1796 | ||
1797 | ||
1798 | .global __put_user_asm_l | |
1799 | __put_user_asm_l: | |
1800 | ld.l r2, 0, r4 /* r4 = data */ | |
1801 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1802 | ||
1803 | ___put_user_asm_l1: | |
1804 | st.l r3, 0, r4 | |
1805 | or ZERO, ZERO, r2 | |
1806 | ||
1807 | ___put_user_asm_l_exit: | |
1808 | ptabs LINK, tr0 | |
1809 | blink tr0, ZERO | |
1810 | ||
1811 | ||
1812 | .global __put_user_asm_q | |
1813 | __put_user_asm_q: | |
1814 | ld.q r2, 0, r4 /* r4 = data */ | |
1815 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1816 | ||
1817 | ___put_user_asm_q1: | |
1818 | st.q r3, 0, r4 | |
1819 | or ZERO, ZERO, r2 | |
1820 | ||
1821 | ___put_user_asm_q_exit: | |
1822 | ptabs LINK, tr0 | |
1823 | blink tr0, ZERO | |
1824 | ||
1825 | panic_stash_regs: | |
1826 | /* The idea is : when we get an unhandled panic, we dump the registers | |
1827 | to a known memory location, the just sit in a tight loop. | |
1828 | This allows the human to look at the memory region through the GDB | |
1829 | session (assuming the debug module's SHwy initiator isn't locked up | |
1830 | or anything), to hopefully analyze the cause of the panic. */ | |
1831 | ||
1832 | /* On entry, former r15 (SP) is in DCR | |
1833 | former r0 is at resvec_saved_area + 0 | |
1834 | former r1 is at resvec_saved_area + 8 | |
1835 | former tr0 is at resvec_saved_area + 32 | |
1836 | DCR is the only register whose value is lost altogether. | |
1837 | */ | |
1838 | ||
1839 | movi 0xffffffff80000000, r0 ! phy of dump area | |
1840 | ld.q SP, 0x000, r1 ! former r0 | |
1841 | st.q r0, 0x000, r1 | |
1842 | ld.q SP, 0x008, r1 ! former r1 | |
1843 | st.q r0, 0x008, r1 | |
1844 | st.q r0, 0x010, r2 | |
1845 | st.q r0, 0x018, r3 | |
1846 | st.q r0, 0x020, r4 | |
1847 | st.q r0, 0x028, r5 | |
1848 | st.q r0, 0x030, r6 | |
1849 | st.q r0, 0x038, r7 | |
1850 | st.q r0, 0x040, r8 | |
1851 | st.q r0, 0x048, r9 | |
1852 | st.q r0, 0x050, r10 | |
1853 | st.q r0, 0x058, r11 | |
1854 | st.q r0, 0x060, r12 | |
1855 | st.q r0, 0x068, r13 | |
1856 | st.q r0, 0x070, r14 | |
1857 | getcon dcr, r14 | |
1858 | st.q r0, 0x078, r14 | |
1859 | st.q r0, 0x080, r16 | |
1860 | st.q r0, 0x088, r17 | |
1861 | st.q r0, 0x090, r18 | |
1862 | st.q r0, 0x098, r19 | |
1863 | st.q r0, 0x0a0, r20 | |
1864 | st.q r0, 0x0a8, r21 | |
1865 | st.q r0, 0x0b0, r22 | |
1866 | st.q r0, 0x0b8, r23 | |
1867 | st.q r0, 0x0c0, r24 | |
1868 | st.q r0, 0x0c8, r25 | |
1869 | st.q r0, 0x0d0, r26 | |
1870 | st.q r0, 0x0d8, r27 | |
1871 | st.q r0, 0x0e0, r28 | |
1872 | st.q r0, 0x0e8, r29 | |
1873 | st.q r0, 0x0f0, r30 | |
1874 | st.q r0, 0x0f8, r31 | |
1875 | st.q r0, 0x100, r32 | |
1876 | st.q r0, 0x108, r33 | |
1877 | st.q r0, 0x110, r34 | |
1878 | st.q r0, 0x118, r35 | |
1879 | st.q r0, 0x120, r36 | |
1880 | st.q r0, 0x128, r37 | |
1881 | st.q r0, 0x130, r38 | |
1882 | st.q r0, 0x138, r39 | |
1883 | st.q r0, 0x140, r40 | |
1884 | st.q r0, 0x148, r41 | |
1885 | st.q r0, 0x150, r42 | |
1886 | st.q r0, 0x158, r43 | |
1887 | st.q r0, 0x160, r44 | |
1888 | st.q r0, 0x168, r45 | |
1889 | st.q r0, 0x170, r46 | |
1890 | st.q r0, 0x178, r47 | |
1891 | st.q r0, 0x180, r48 | |
1892 | st.q r0, 0x188, r49 | |
1893 | st.q r0, 0x190, r50 | |
1894 | st.q r0, 0x198, r51 | |
1895 | st.q r0, 0x1a0, r52 | |
1896 | st.q r0, 0x1a8, r53 | |
1897 | st.q r0, 0x1b0, r54 | |
1898 | st.q r0, 0x1b8, r55 | |
1899 | st.q r0, 0x1c0, r56 | |
1900 | st.q r0, 0x1c8, r57 | |
1901 | st.q r0, 0x1d0, r58 | |
1902 | st.q r0, 0x1d8, r59 | |
1903 | st.q r0, 0x1e0, r60 | |
1904 | st.q r0, 0x1e8, r61 | |
1905 | st.q r0, 0x1f0, r62 | |
1906 | st.q r0, 0x1f8, r63 ! bogus, but for consistency's sake... | |
1907 | ||
1908 | ld.q SP, 0x020, r1 ! former tr0 | |
1909 | st.q r0, 0x200, r1 | |
1910 | gettr tr1, r1 | |
1911 | st.q r0, 0x208, r1 | |
1912 | gettr tr2, r1 | |
1913 | st.q r0, 0x210, r1 | |
1914 | gettr tr3, r1 | |
1915 | st.q r0, 0x218, r1 | |
1916 | gettr tr4, r1 | |
1917 | st.q r0, 0x220, r1 | |
1918 | gettr tr5, r1 | |
1919 | st.q r0, 0x228, r1 | |
1920 | gettr tr6, r1 | |
1921 | st.q r0, 0x230, r1 | |
1922 | gettr tr7, r1 | |
1923 | st.q r0, 0x238, r1 | |
1924 | ||
1925 | getcon sr, r1 | |
1926 | getcon ssr, r2 | |
1927 | getcon pssr, r3 | |
1928 | getcon spc, r4 | |
1929 | getcon pspc, r5 | |
1930 | getcon intevt, r6 | |
1931 | getcon expevt, r7 | |
1932 | getcon pexpevt, r8 | |
1933 | getcon tra, r9 | |
1934 | getcon tea, r10 | |
1935 | getcon kcr0, r11 | |
1936 | getcon kcr1, r12 | |
1937 | getcon vbr, r13 | |
1938 | getcon resvec, r14 | |
1939 | ||
1940 | st.q r0, 0x240, r1 | |
1941 | st.q r0, 0x248, r2 | |
1942 | st.q r0, 0x250, r3 | |
1943 | st.q r0, 0x258, r4 | |
1944 | st.q r0, 0x260, r5 | |
1945 | st.q r0, 0x268, r6 | |
1946 | st.q r0, 0x270, r7 | |
1947 | st.q r0, 0x278, r8 | |
1948 | st.q r0, 0x280, r9 | |
1949 | st.q r0, 0x288, r10 | |
1950 | st.q r0, 0x290, r11 | |
1951 | st.q r0, 0x298, r12 | |
1952 | st.q r0, 0x2a0, r13 | |
1953 | st.q r0, 0x2a8, r14 | |
1954 | ||
1955 | getcon SPC,r2 | |
1956 | getcon SSR,r3 | |
1957 | getcon EXPEVT,r4 | |
1958 | /* Prepare to jump to C - physical address */ | |
36763b22 | 1959 | movi panic_handler-CONFIG_PAGE_OFFSET, r1 |
1da177e4 LT |
1960 | ori r1, 1, r1 |
1961 | ptabs r1, tr0 | |
1962 | getcon DCR, SP | |
1963 | blink tr0, ZERO | |
1964 | nop | |
1965 | nop | |
1966 | nop | |
1967 | nop | |
1968 | ||
1969 | ||
1970 | ||
1971 | ||
1972 | /* | |
1973 | * --- Signal Handling Section | |
1974 | */ | |
1975 | ||
1976 | /* | |
1977 | * extern long long _sa_default_rt_restorer | |
1978 | * extern long long _sa_default_restorer | |
1979 | * | |
1980 | * or, better, | |
1981 | * | |
1982 | * extern void _sa_default_rt_restorer(void) | |
1983 | * extern void _sa_default_restorer(void) | |
1984 | * | |
1985 | * Code prototypes to do a sys_rt_sigreturn() or sys_sysreturn() | |
1986 | * from user space. Copied into user space by signal management. | |
1987 | * Both must be quad aligned and 2 quad long (4 instructions). | |
1988 | * | |
1989 | */ | |
1990 | .balign 8 | |
1991 | .global sa_default_rt_restorer | |
1992 | sa_default_rt_restorer: | |
1993 | movi 0x10, r9 | |
1994 | shori __NR_rt_sigreturn, r9 | |
1995 | trapa r9 | |
1996 | nop | |
1997 | ||
1998 | .balign 8 | |
1999 | .global sa_default_restorer | |
2000 | sa_default_restorer: | |
2001 | movi 0x10, r9 | |
2002 | shori __NR_sigreturn, r9 | |
2003 | trapa r9 | |
2004 | nop | |
2005 | ||
2006 | /* | |
2007 | * --- __ex_table Section | |
2008 | */ | |
2009 | ||
2010 | /* | |
2011 | * User Access Exception Table. | |
2012 | */ | |
2013 | .section __ex_table, "a" | |
2014 | ||
2015 | .global asm_uaccess_start /* Just a marker */ | |
2016 | asm_uaccess_start: | |
2017 | ||
2018 | .long ___copy_user1, ___copy_user_exit | |
2019 | .long ___copy_user2, ___copy_user_exit | |
2020 | .long ___clear_user1, ___clear_user_exit | |
2021 | .long ___strncpy_from_user1, ___strncpy_from_user_exit | |
2022 | .long ___strnlen_user1, ___strnlen_user_exit | |
2023 | .long ___get_user_asm_b1, ___get_user_asm_b_exit | |
2024 | .long ___get_user_asm_w1, ___get_user_asm_w_exit | |
2025 | .long ___get_user_asm_l1, ___get_user_asm_l_exit | |
2026 | .long ___get_user_asm_q1, ___get_user_asm_q_exit | |
2027 | .long ___put_user_asm_b1, ___put_user_asm_b_exit | |
2028 | .long ___put_user_asm_w1, ___put_user_asm_w_exit | |
2029 | .long ___put_user_asm_l1, ___put_user_asm_l_exit | |
2030 | .long ___put_user_asm_q1, ___put_user_asm_q_exit | |
2031 | ||
2032 | .global asm_uaccess_end /* Just a marker */ | |
2033 | asm_uaccess_end: | |
2034 | ||
2035 | ||
2036 | ||
2037 | ||
2038 | /* | |
2039 | * --- .text.init Section | |
2040 | */ | |
2041 | ||
2042 | .section .text.init, "ax" | |
2043 | ||
2044 | /* | |
2045 | * void trap_init (void) | |
2046 | * | |
2047 | */ | |
2048 | .global trap_init | |
2049 | trap_init: | |
2050 | addi SP, -24, SP /* Room to save r28/r29/r30 */ | |
2051 | st.q SP, 0, r28 | |
2052 | st.q SP, 8, r29 | |
2053 | st.q SP, 16, r30 | |
2054 | ||
2055 | /* Set VBR and RESVEC */ | |
2056 | movi LVBR_block, r19 | |
2057 | andi r19, -4, r19 /* reset MMUOFF + reserved */ | |
2058 | /* For RESVEC exceptions we force the MMU off, which means we need the | |
2059 | physical address. */ | |
36763b22 | 2060 | movi LRESVEC_block-CONFIG_PAGE_OFFSET, r20 |
1da177e4 LT |
2061 | andi r20, -4, r20 /* reset reserved */ |
2062 | ori r20, 1, r20 /* set MMUOFF */ | |
2063 | putcon r19, VBR | |
2064 | putcon r20, RESVEC | |
2065 | ||
2066 | /* Sanity check */ | |
2067 | movi LVBR_block_end, r21 | |
2068 | andi r21, -4, r21 | |
2069 | movi BLOCK_SIZE, r29 /* r29 = expected size */ | |
2070 | or r19, ZERO, r30 | |
2071 | add r19, r29, r19 | |
2072 | ||
2073 | /* | |
2074 | * Ugly, but better loop forever now than crash afterwards. | |
2075 | * We should print a message, but if we touch LVBR or | |
2076 | * LRESVEC blocks we should not be surprised if we get stuck | |
2077 | * in trap_init(). | |
2078 | */ | |
2079 | pta trap_init_loop, tr1 | |
2080 | gettr tr1, r28 /* r28 = trap_init_loop */ | |
2081 | sub r21, r30, r30 /* r30 = actual size */ | |
2082 | ||
2083 | /* | |
2084 | * VBR/RESVEC handlers overlap by being bigger than | |
2085 | * allowed. Very bad. Just loop forever. | |
2086 | * (r28) panic/loop address | |
2087 | * (r29) expected size | |
2088 | * (r30) actual size | |
2089 | */ | |
2090 | trap_init_loop: | |
2091 | bne r19, r21, tr1 | |
2092 | ||
2093 | /* Now that exception vectors are set up reset SR.BL */ | |
2094 | getcon SR, r22 | |
2095 | movi SR_UNBLOCK_EXC, r23 | |
2096 | and r22, r23, r22 | |
2097 | putcon r22, SR | |
2098 | ||
2099 | addi SP, 24, SP | |
2100 | ptabs LINK, tr0 | |
2101 | blink tr0, ZERO | |
2102 |