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1da177e4 | 1 | /* |
a23ba435 | 2 | * arch/sh/kernel/cpu/sh5/entry.S |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
dbce1f64 | 5 | * Copyright (C) 2004 - 2008 Paul Mundt |
a23ba435 | 6 | * Copyright (C) 2003, 2004 Richard Curnow |
1da177e4 | 7 | * |
a23ba435 PM |
8 | * This file is subject to the terms and conditions of the GNU General Public |
9 | * License. See the file "COPYING" in the main directory of this archive | |
10 | * for more details. | |
1da177e4 | 11 | */ |
1da177e4 | 12 | #include <linux/errno.h> |
882016ff | 13 | #include <linux/init.h> |
1da177e4 | 14 | #include <linux/sys.h> |
f15cbe6f | 15 | #include <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 */ | |
ccd80587 | 147 | #ifdef CONFIG_MMU |
1da177e4 LT |
148 | .long tlb_miss_load /* 0x040 */ |
149 | .long tlb_miss_store /* 0x060 */ | |
ccd80587 PM |
150 | #else |
151 | .long do_exception_error | |
152 | .long do_exception_error | |
153 | #endif | |
1da177e4 LT |
154 | ! ARTIFICIAL pseudo-EXPEVT setting |
155 | .long do_debug_interrupt /* 0x080 */ | |
ccd80587 | 156 | #ifdef CONFIG_MMU |
1da177e4 LT |
157 | .long tlb_miss_load /* 0x0A0 */ |
158 | .long tlb_miss_store /* 0x0C0 */ | |
ccd80587 PM |
159 | #else |
160 | .long do_exception_error | |
161 | .long do_exception_error | |
162 | #endif | |
1da177e4 LT |
163 | .long do_address_error_load /* 0x0E0 */ |
164 | .long do_address_error_store /* 0x100 */ | |
165 | #ifdef CONFIG_SH_FPU | |
166 | .long do_fpu_error /* 0x120 */ | |
167 | #else | |
168 | .long do_exception_error /* 0x120 */ | |
169 | #endif | |
170 | .long do_exception_error /* 0x140 */ | |
171 | .long system_call /* 0x160 */ | |
172 | .long do_reserved_inst /* 0x180 */ | |
173 | .long do_illegal_slot_inst /* 0x1A0 */ | |
92b59258 | 174 | .long do_exception_error /* 0x1C0 - NMI */ |
1da177e4 LT |
175 | .long do_exception_error /* 0x1E0 */ |
176 | .rept 15 | |
177 | .long do_IRQ /* 0x200 - 0x3C0 */ | |
178 | .endr | |
179 | .long do_exception_error /* 0x3E0 */ | |
180 | .rept 32 | |
181 | .long do_IRQ /* 0x400 - 0x7E0 */ | |
182 | .endr | |
183 | .long fpu_error_or_IRQA /* 0x800 */ | |
184 | .long fpu_error_or_IRQB /* 0x820 */ | |
185 | .long do_IRQ /* 0x840 */ | |
186 | .long do_IRQ /* 0x860 */ | |
187 | .rept 6 | |
188 | .long do_exception_error /* 0x880 - 0x920 */ | |
189 | .endr | |
a4ae2b2b | 190 | .long breakpoint_trap_handler /* 0x940 */ |
1da177e4 LT |
191 | .long do_exception_error /* 0x960 */ |
192 | .long do_single_step /* 0x980 */ | |
193 | ||
194 | .rept 3 | |
195 | .long do_exception_error /* 0x9A0 - 0x9E0 */ | |
196 | .endr | |
197 | .long do_IRQ /* 0xA00 */ | |
198 | .long do_IRQ /* 0xA20 */ | |
ccd80587 | 199 | #ifdef CONFIG_MMU |
1da177e4 | 200 | .long itlb_miss_or_IRQ /* 0xA40 */ |
ccd80587 PM |
201 | #else |
202 | .long do_IRQ | |
203 | #endif | |
1da177e4 LT |
204 | .long do_IRQ /* 0xA60 */ |
205 | .long do_IRQ /* 0xA80 */ | |
ccd80587 | 206 | #ifdef CONFIG_MMU |
1da177e4 | 207 | .long itlb_miss_or_IRQ /* 0xAA0 */ |
ccd80587 PM |
208 | #else |
209 | .long do_IRQ | |
210 | #endif | |
1da177e4 LT |
211 | .long do_exception_error /* 0xAC0 */ |
212 | .long do_address_error_exec /* 0xAE0 */ | |
213 | .rept 8 | |
214 | .long do_exception_error /* 0xB00 - 0xBE0 */ | |
215 | .endr | |
216 | .rept 18 | |
217 | .long do_IRQ /* 0xC00 - 0xE20 */ | |
218 | .endr | |
219 | ||
220 | .section .text64, "ax" | |
221 | ||
222 | /* | |
223 | * --- Exception/Interrupt/Event Handling Section | |
224 | */ | |
225 | ||
226 | /* | |
227 | * VBR and RESVEC blocks. | |
228 | * | |
229 | * First level handler for VBR-based exceptions. | |
230 | * | |
231 | * To avoid waste of space, align to the maximum text block size. | |
232 | * This is assumed to be at most 128 bytes or 32 instructions. | |
233 | * DO NOT EXCEED 32 instructions on the first level handlers ! | |
234 | * | |
235 | * Also note that RESVEC is contained within the VBR block | |
236 | * where the room left (1KB - TEXT_SIZE) allows placing | |
237 | * the RESVEC block (at most 512B + TEXT_SIZE). | |
238 | * | |
239 | * So first (and only) level handler for RESVEC-based exceptions. | |
240 | * | |
241 | * Where the fault/interrupt is handled (not_a_tlb_miss, tlb_miss | |
242 | * and interrupt) we are a lot tight with register space until | |
243 | * saving onto the stack frame, which is done in handle_exception(). | |
244 | * | |
245 | */ | |
246 | ||
247 | #define TEXT_SIZE 128 | |
248 | #define BLOCK_SIZE 1664 /* Dynamic check, 13*128 */ | |
249 | ||
250 | .balign TEXT_SIZE | |
251 | LVBR_block: | |
252 | .space 256, 0 /* Power-on class handler, */ | |
253 | /* not required here */ | |
254 | not_a_tlb_miss: | |
255 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
256 | /* Save original stack pointer into KCR1 */ | |
257 | putcon SP, KCR1 | |
258 | ||
259 | /* Save other original registers into reg_save_area */ | |
260 | movi reg_save_area, SP | |
261 | st.q SP, SAVED_R2, r2 | |
262 | st.q SP, SAVED_R3, r3 | |
263 | st.q SP, SAVED_R4, r4 | |
264 | st.q SP, SAVED_R5, r5 | |
265 | st.q SP, SAVED_R6, r6 | |
266 | st.q SP, SAVED_R18, r18 | |
267 | gettr tr0, r3 | |
268 | st.q SP, SAVED_TR0, r3 | |
269 | ||
270 | /* Set args for Non-debug, Not a TLB miss class handler */ | |
271 | getcon EXPEVT, r2 | |
272 | movi ret_from_exception, r3 | |
273 | ori r3, 1, r3 | |
274 | movi EVENT_FAULT_NOT_TLB, r4 | |
275 | or SP, ZERO, r5 | |
276 | getcon KCR1, SP | |
277 | pta handle_exception, tr0 | |
278 | blink tr0, ZERO | |
279 | ||
280 | .balign 256 | |
281 | ! VBR+0x200 | |
282 | nop | |
283 | .balign 256 | |
284 | ! VBR+0x300 | |
285 | nop | |
286 | .balign 256 | |
287 | /* | |
288 | * Instead of the natural .balign 1024 place RESVEC here | |
289 | * respecting the final 1KB alignment. | |
290 | */ | |
291 | .balign TEXT_SIZE | |
292 | /* | |
293 | * Instead of '.space 1024-TEXT_SIZE' place the RESVEC | |
294 | * block making sure the final alignment is correct. | |
295 | */ | |
ccd80587 | 296 | #ifdef CONFIG_MMU |
1da177e4 LT |
297 | tlb_miss: |
298 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
299 | putcon SP, KCR1 | |
300 | movi reg_save_area, SP | |
301 | /* SP is guaranteed 32-byte aligned. */ | |
302 | st.q SP, TLB_SAVED_R0 , r0 | |
303 | st.q SP, TLB_SAVED_R1 , r1 | |
304 | st.q SP, SAVED_R2 , r2 | |
305 | st.q SP, SAVED_R3 , r3 | |
306 | st.q SP, SAVED_R4 , r4 | |
307 | st.q SP, SAVED_R5 , r5 | |
308 | st.q SP, SAVED_R6 , r6 | |
309 | st.q SP, SAVED_R18, r18 | |
310 | ||
311 | /* Save R25 for safety; as/ld may want to use it to achieve the call to | |
312 | * the code in mm/tlbmiss.c */ | |
313 | st.q SP, TLB_SAVED_R25, r25 | |
314 | gettr tr0, r2 | |
315 | gettr tr1, r3 | |
316 | gettr tr2, r4 | |
317 | gettr tr3, r5 | |
318 | gettr tr4, r18 | |
319 | st.q SP, SAVED_TR0 , r2 | |
320 | st.q SP, TLB_SAVED_TR1 , r3 | |
321 | st.q SP, TLB_SAVED_TR2 , r4 | |
322 | st.q SP, TLB_SAVED_TR3 , r5 | |
323 | st.q SP, TLB_SAVED_TR4 , r18 | |
324 | ||
325 | pt do_fast_page_fault, tr0 | |
326 | getcon SSR, r2 | |
327 | getcon EXPEVT, r3 | |
328 | getcon TEA, r4 | |
329 | shlri r2, 30, r2 | |
330 | andi r2, 1, r2 /* r2 = SSR.MD */ | |
331 | blink tr0, LINK | |
332 | ||
333 | pt fixup_to_invoke_general_handler, tr1 | |
334 | ||
335 | /* If the fast path handler fixed the fault, just drop through quickly | |
336 | to the restore code right away to return to the excepting context. | |
337 | */ | |
338 | beqi/u r2, 0, tr1 | |
339 | ||
340 | fast_tlb_miss_restore: | |
341 | ld.q SP, SAVED_TR0, r2 | |
342 | ld.q SP, TLB_SAVED_TR1, r3 | |
343 | ld.q SP, TLB_SAVED_TR2, r4 | |
344 | ||
345 | ld.q SP, TLB_SAVED_TR3, r5 | |
346 | ld.q SP, TLB_SAVED_TR4, r18 | |
347 | ||
348 | ptabs r2, tr0 | |
349 | ptabs r3, tr1 | |
350 | ptabs r4, tr2 | |
351 | ptabs r5, tr3 | |
352 | ptabs r18, tr4 | |
353 | ||
354 | ld.q SP, TLB_SAVED_R0, r0 | |
355 | ld.q SP, TLB_SAVED_R1, r1 | |
356 | ld.q SP, SAVED_R2, r2 | |
357 | ld.q SP, SAVED_R3, r3 | |
358 | ld.q SP, SAVED_R4, r4 | |
359 | ld.q SP, SAVED_R5, r5 | |
360 | ld.q SP, SAVED_R6, r6 | |
361 | ld.q SP, SAVED_R18, r18 | |
362 | ld.q SP, TLB_SAVED_R25, r25 | |
363 | ||
364 | getcon KCR1, SP | |
365 | rte | |
366 | nop /* for safety, in case the code is run on sh5-101 cut1.x */ | |
367 | ||
368 | fixup_to_invoke_general_handler: | |
369 | ||
370 | /* OK, new method. Restore stuff that's not expected to get saved into | |
371 | the 'first-level' reg save area, then just fall through to setting | |
372 | up the registers and calling the second-level handler. */ | |
373 | ||
374 | /* 2nd level expects r2,3,4,5,6,18,tr0 to be saved. So we must restore | |
375 | r25,tr1-4 and save r6 to get into the right state. */ | |
376 | ||
377 | ld.q SP, TLB_SAVED_TR1, r3 | |
378 | ld.q SP, TLB_SAVED_TR2, r4 | |
379 | ld.q SP, TLB_SAVED_TR3, r5 | |
380 | ld.q SP, TLB_SAVED_TR4, r18 | |
381 | ld.q SP, TLB_SAVED_R25, r25 | |
382 | ||
383 | ld.q SP, TLB_SAVED_R0, r0 | |
384 | ld.q SP, TLB_SAVED_R1, r1 | |
385 | ||
386 | ptabs/u r3, tr1 | |
387 | ptabs/u r4, tr2 | |
388 | ptabs/u r5, tr3 | |
389 | ptabs/u r18, tr4 | |
390 | ||
391 | /* Set args for Non-debug, TLB miss class handler */ | |
392 | getcon EXPEVT, r2 | |
393 | movi ret_from_exception, r3 | |
394 | ori r3, 1, r3 | |
395 | movi EVENT_FAULT_TLB, r4 | |
396 | or SP, ZERO, r5 | |
397 | getcon KCR1, SP | |
398 | pta handle_exception, tr0 | |
399 | blink tr0, ZERO | |
ccd80587 PM |
400 | #else /* CONFIG_MMU */ |
401 | .balign 256 | |
402 | #endif | |
1da177e4 LT |
403 | |
404 | /* NB TAKE GREAT CARE HERE TO ENSURE THAT THE INTERRUPT CODE | |
405 | DOES END UP AT VBR+0x600 */ | |
406 | nop | |
407 | nop | |
408 | nop | |
409 | nop | |
410 | nop | |
411 | nop | |
412 | ||
413 | .balign 256 | |
414 | /* VBR + 0x600 */ | |
415 | ||
416 | interrupt: | |
417 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
418 | /* Save original stack pointer into KCR1 */ | |
419 | putcon SP, KCR1 | |
420 | ||
421 | /* Save other original registers into reg_save_area */ | |
422 | movi reg_save_area, SP | |
423 | st.q SP, SAVED_R2, r2 | |
424 | st.q SP, SAVED_R3, r3 | |
425 | st.q SP, SAVED_R4, r4 | |
426 | st.q SP, SAVED_R5, r5 | |
427 | st.q SP, SAVED_R6, r6 | |
428 | st.q SP, SAVED_R18, r18 | |
429 | gettr tr0, r3 | |
430 | st.q SP, SAVED_TR0, r3 | |
431 | ||
432 | /* Set args for interrupt class handler */ | |
433 | getcon INTEVT, r2 | |
434 | movi ret_from_irq, r3 | |
435 | ori r3, 1, r3 | |
436 | movi EVENT_INTERRUPT, r4 | |
437 | or SP, ZERO, r5 | |
438 | getcon KCR1, SP | |
439 | pta handle_exception, tr0 | |
440 | blink tr0, ZERO | |
441 | .balign TEXT_SIZE /* let's waste the bare minimum */ | |
442 | ||
443 | LVBR_block_end: /* Marker. Used for total checking */ | |
444 | ||
445 | .balign 256 | |
446 | LRESVEC_block: | |
447 | /* Panic handler. Called with MMU off. Possible causes/actions: | |
448 | * - Reset: Jump to program start. | |
449 | * - Single Step: Turn off Single Step & return. | |
450 | * - Others: Call panic handler, passing PC as arg. | |
451 | * (this may need to be extended...) | |
452 | */ | |
453 | reset_or_panic: | |
454 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
455 | putcon SP, DCR | |
456 | /* First save r0-1 and tr0, as we need to use these */ | |
36763b22 | 457 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
1da177e4 LT |
458 | st.q SP, 0, r0 |
459 | st.q SP, 8, r1 | |
460 | gettr tr0, r0 | |
461 | st.q SP, 32, r0 | |
462 | ||
463 | /* Check cause */ | |
464 | getcon EXPEVT, r0 | |
465 | movi RESET_CAUSE, r1 | |
466 | sub r1, r0, r1 /* r1=0 if reset */ | |
36763b22 | 467 | movi _stext-CONFIG_PAGE_OFFSET, r0 |
1da177e4 LT |
468 | ori r0, 1, r0 |
469 | ptabs r0, tr0 | |
470 | beqi r1, 0, tr0 /* Jump to start address if reset */ | |
471 | ||
472 | getcon EXPEVT, r0 | |
473 | movi DEBUGSS_CAUSE, r1 | |
474 | sub r1, r0, r1 /* r1=0 if single step */ | |
475 | pta single_step_panic, tr0 | |
476 | beqi r1, 0, tr0 /* jump if single step */ | |
477 | ||
478 | /* Now jump to where we save the registers. */ | |
36763b22 | 479 | movi panic_stash_regs-CONFIG_PAGE_OFFSET, r1 |
1da177e4 LT |
480 | ptabs r1, tr0 |
481 | blink tr0, r63 | |
482 | ||
483 | single_step_panic: | |
484 | /* We are in a handler with Single Step set. We need to resume the | |
485 | * handler, by turning on MMU & turning off Single Step. */ | |
486 | getcon SSR, r0 | |
487 | movi SR_MMU, r1 | |
488 | or r0, r1, r0 | |
489 | movi ~SR_SS, r1 | |
490 | and r0, r1, r0 | |
491 | putcon r0, SSR | |
492 | /* Restore EXPEVT, as the rte won't do this */ | |
493 | getcon PEXPEVT, r0 | |
494 | putcon r0, EXPEVT | |
495 | /* Restore regs */ | |
496 | ld.q SP, 32, r0 | |
497 | ptabs r0, tr0 | |
498 | ld.q SP, 0, r0 | |
499 | ld.q SP, 8, r1 | |
500 | getcon DCR, SP | |
501 | synco | |
502 | rte | |
503 | ||
504 | ||
505 | .balign 256 | |
506 | debug_exception: | |
507 | synco /* TAKum03020 (but probably a good idea anyway.) */ | |
508 | /* | |
509 | * Single step/software_break_point first level handler. | |
510 | * Called with MMU off, so the first thing we do is enable it | |
511 | * by doing an rte with appropriate SSR. | |
512 | */ | |
513 | putcon SP, DCR | |
514 | /* Save SSR & SPC, together with R0 & R1, as we need to use 2 regs. */ | |
36763b22 | 515 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
1da177e4 LT |
516 | |
517 | /* With the MMU off, we are bypassing the cache, so purge any | |
518 | * data that will be made stale by the following stores. | |
519 | */ | |
520 | ocbp SP, 0 | |
521 | synco | |
522 | ||
523 | st.q SP, 0, r0 | |
524 | st.q SP, 8, r1 | |
525 | getcon SPC, r0 | |
526 | st.q SP, 16, r0 | |
527 | getcon SSR, r0 | |
528 | st.q SP, 24, r0 | |
529 | ||
530 | /* Enable MMU, block exceptions, set priv mode, disable single step */ | |
531 | movi SR_MMU | SR_BL | SR_MD, r1 | |
532 | or r0, r1, r0 | |
533 | movi ~SR_SS, r1 | |
534 | and r0, r1, r0 | |
535 | putcon r0, SSR | |
536 | /* Force control to debug_exception_2 when rte is executed */ | |
537 | movi debug_exeception_2, r0 | |
538 | ori r0, 1, r0 /* force SHmedia, just in case */ | |
539 | putcon r0, SPC | |
540 | getcon DCR, SP | |
541 | synco | |
542 | rte | |
543 | debug_exeception_2: | |
544 | /* Restore saved regs */ | |
545 | putcon SP, KCR1 | |
546 | movi resvec_save_area, SP | |
547 | ld.q SP, 24, r0 | |
548 | putcon r0, SSR | |
549 | ld.q SP, 16, r0 | |
550 | putcon r0, SPC | |
551 | ld.q SP, 0, r0 | |
552 | ld.q SP, 8, r1 | |
553 | ||
554 | /* Save other original registers into reg_save_area */ | |
555 | movi reg_save_area, SP | |
556 | st.q SP, SAVED_R2, r2 | |
557 | st.q SP, SAVED_R3, r3 | |
558 | st.q SP, SAVED_R4, r4 | |
559 | st.q SP, SAVED_R5, r5 | |
560 | st.q SP, SAVED_R6, r6 | |
561 | st.q SP, SAVED_R18, r18 | |
562 | gettr tr0, r3 | |
563 | st.q SP, SAVED_TR0, r3 | |
564 | ||
565 | /* Set args for debug class handler */ | |
566 | getcon EXPEVT, r2 | |
567 | movi ret_from_exception, r3 | |
568 | ori r3, 1, r3 | |
569 | movi EVENT_DEBUG, r4 | |
570 | or SP, ZERO, r5 | |
571 | getcon KCR1, SP | |
572 | pta handle_exception, tr0 | |
573 | blink tr0, ZERO | |
574 | ||
575 | .balign 256 | |
576 | debug_interrupt: | |
577 | /* !!! WE COME HERE IN REAL MODE !!! */ | |
578 | /* Hook-up debug interrupt to allow various debugging options to be | |
579 | * hooked into its handler. */ | |
580 | /* Save original stack pointer into KCR1 */ | |
581 | synco | |
582 | putcon SP, KCR1 | |
36763b22 | 583 | movi resvec_save_area-CONFIG_PAGE_OFFSET, SP |
1da177e4 LT |
584 | ocbp SP, 0 |
585 | ocbp SP, 32 | |
586 | synco | |
587 | ||
588 | /* Save other original registers into reg_save_area thru real addresses */ | |
589 | st.q SP, SAVED_R2, r2 | |
590 | st.q SP, SAVED_R3, r3 | |
591 | st.q SP, SAVED_R4, r4 | |
592 | st.q SP, SAVED_R5, r5 | |
593 | st.q SP, SAVED_R6, r6 | |
594 | st.q SP, SAVED_R18, r18 | |
595 | gettr tr0, r3 | |
596 | st.q SP, SAVED_TR0, r3 | |
597 | ||
598 | /* move (spc,ssr)->(pspc,pssr). The rte will shift | |
599 | them back again, so that they look like the originals | |
600 | as far as the real handler code is concerned. */ | |
601 | getcon spc, r6 | |
602 | putcon r6, pspc | |
603 | getcon ssr, r6 | |
604 | putcon r6, pssr | |
605 | ||
606 | ! construct useful SR for handle_exception | |
607 | movi 3, r6 | |
608 | shlli r6, 30, r6 | |
609 | getcon sr, r18 | |
610 | or r18, r6, r6 | |
611 | putcon r6, ssr | |
612 | ||
613 | ! SSR is now the current SR with the MD and MMU bits set | |
614 | ! i.e. the rte will switch back to priv mode and put | |
615 | ! the mmu back on | |
616 | ||
617 | ! construct spc | |
618 | movi handle_exception, r18 | |
619 | ori r18, 1, r18 ! for safety (do we need this?) | |
620 | putcon r18, spc | |
621 | ||
622 | /* Set args for Non-debug, Not a TLB miss class handler */ | |
623 | ||
624 | ! EXPEVT==0x80 is unused, so 'steal' this value to put the | |
625 | ! debug interrupt handler in the vectoring table | |
626 | movi 0x80, r2 | |
627 | movi ret_from_exception, r3 | |
628 | ori r3, 1, r3 | |
629 | movi EVENT_FAULT_NOT_TLB, r4 | |
630 | ||
631 | or SP, ZERO, r5 | |
36763b22 | 632 | movi CONFIG_PAGE_OFFSET, r6 |
1da177e4 LT |
633 | add r6, r5, r5 |
634 | getcon KCR1, SP | |
635 | ||
636 | synco ! for safety | |
637 | rte ! -> handle_exception, switch back to priv mode again | |
638 | ||
639 | LRESVEC_block_end: /* Marker. Unused. */ | |
640 | ||
641 | .balign TEXT_SIZE | |
642 | ||
643 | /* | |
644 | * Second level handler for VBR-based exceptions. Pre-handler. | |
645 | * In common to all stack-frame sensitive handlers. | |
646 | * | |
647 | * Inputs: | |
648 | * (KCR0) Current [current task union] | |
649 | * (KCR1) Original SP | |
650 | * (r2) INTEVT/EXPEVT | |
651 | * (r3) appropriate return address | |
652 | * (r4) Event (0 = interrupt, 1 = TLB miss fault, 2 = Not TLB miss fault, 3=debug) | |
653 | * (r5) Pointer to reg_save_area | |
654 | * (SP) Original SP | |
655 | * | |
656 | * Available registers: | |
657 | * (r6) | |
658 | * (r18) | |
659 | * (tr0) | |
660 | * | |
661 | */ | |
662 | handle_exception: | |
663 | /* Common 2nd level handler. */ | |
664 | ||
665 | /* First thing we need an appropriate stack pointer */ | |
666 | getcon SSR, r6 | |
667 | shlri r6, 30, r6 | |
668 | andi r6, 1, r6 | |
669 | pta stack_ok, tr0 | |
670 | bne r6, ZERO, tr0 /* Original stack pointer is fine */ | |
671 | ||
672 | /* Set stack pointer for user fault */ | |
673 | getcon KCR0, SP | |
674 | movi THREAD_SIZE, r6 /* Point to the end */ | |
675 | add SP, r6, SP | |
676 | ||
677 | stack_ok: | |
678 | ||
679 | /* DEBUG : check for underflow/overflow of the kernel stack */ | |
680 | pta no_underflow, tr0 | |
681 | getcon KCR0, r6 | |
682 | movi 1024, r18 | |
683 | add r6, r18, r6 | |
684 | bge SP, r6, tr0 ! ? below 1k from bottom of stack : danger zone | |
685 | ||
686 | /* Just panic to cause a crash. */ | |
687 | bad_sp: | |
688 | ld.b r63, 0, r6 | |
689 | nop | |
690 | ||
691 | no_underflow: | |
692 | pta bad_sp, tr0 | |
693 | getcon kcr0, r6 | |
694 | movi THREAD_SIZE, r18 | |
695 | add r18, r6, r6 | |
696 | bgt SP, r6, tr0 ! sp above the stack | |
697 | ||
698 | /* Make some room for the BASIC frame. */ | |
699 | movi -(FRAME_SIZE), r6 | |
700 | add SP, r6, SP | |
701 | ||
702 | /* Could do this with no stalling if we had another spare register, but the | |
703 | code below will be OK. */ | |
704 | ld.q r5, SAVED_R2, r6 | |
705 | ld.q r5, SAVED_R3, r18 | |
706 | st.q SP, FRAME_R(2), r6 | |
707 | ld.q r5, SAVED_R4, r6 | |
708 | st.q SP, FRAME_R(3), r18 | |
709 | ld.q r5, SAVED_R5, r18 | |
710 | st.q SP, FRAME_R(4), r6 | |
711 | ld.q r5, SAVED_R6, r6 | |
712 | st.q SP, FRAME_R(5), r18 | |
713 | ld.q r5, SAVED_R18, r18 | |
714 | st.q SP, FRAME_R(6), r6 | |
715 | ld.q r5, SAVED_TR0, r6 | |
716 | st.q SP, FRAME_R(18), r18 | |
717 | st.q SP, FRAME_T(0), r6 | |
718 | ||
719 | /* Keep old SP around */ | |
720 | getcon KCR1, r6 | |
721 | ||
722 | /* Save the rest of the general purpose registers */ | |
723 | st.q SP, FRAME_R(0), r0 | |
724 | st.q SP, FRAME_R(1), r1 | |
725 | st.q SP, FRAME_R(7), r7 | |
726 | st.q SP, FRAME_R(8), r8 | |
727 | st.q SP, FRAME_R(9), r9 | |
728 | st.q SP, FRAME_R(10), r10 | |
729 | st.q SP, FRAME_R(11), r11 | |
730 | st.q SP, FRAME_R(12), r12 | |
731 | st.q SP, FRAME_R(13), r13 | |
732 | st.q SP, FRAME_R(14), r14 | |
733 | ||
734 | /* SP is somewhere else */ | |
735 | st.q SP, FRAME_R(15), r6 | |
736 | ||
737 | st.q SP, FRAME_R(16), r16 | |
738 | st.q SP, FRAME_R(17), r17 | |
739 | /* r18 is saved earlier. */ | |
740 | st.q SP, FRAME_R(19), r19 | |
741 | st.q SP, FRAME_R(20), r20 | |
742 | st.q SP, FRAME_R(21), r21 | |
743 | st.q SP, FRAME_R(22), r22 | |
744 | st.q SP, FRAME_R(23), r23 | |
745 | st.q SP, FRAME_R(24), r24 | |
746 | st.q SP, FRAME_R(25), r25 | |
747 | st.q SP, FRAME_R(26), r26 | |
748 | st.q SP, FRAME_R(27), r27 | |
749 | st.q SP, FRAME_R(28), r28 | |
750 | st.q SP, FRAME_R(29), r29 | |
751 | st.q SP, FRAME_R(30), r30 | |
752 | st.q SP, FRAME_R(31), r31 | |
753 | st.q SP, FRAME_R(32), r32 | |
754 | st.q SP, FRAME_R(33), r33 | |
755 | st.q SP, FRAME_R(34), r34 | |
756 | st.q SP, FRAME_R(35), r35 | |
757 | st.q SP, FRAME_R(36), r36 | |
758 | st.q SP, FRAME_R(37), r37 | |
759 | st.q SP, FRAME_R(38), r38 | |
760 | st.q SP, FRAME_R(39), r39 | |
761 | st.q SP, FRAME_R(40), r40 | |
762 | st.q SP, FRAME_R(41), r41 | |
763 | st.q SP, FRAME_R(42), r42 | |
764 | st.q SP, FRAME_R(43), r43 | |
765 | st.q SP, FRAME_R(44), r44 | |
766 | st.q SP, FRAME_R(45), r45 | |
767 | st.q SP, FRAME_R(46), r46 | |
768 | st.q SP, FRAME_R(47), r47 | |
769 | st.q SP, FRAME_R(48), r48 | |
770 | st.q SP, FRAME_R(49), r49 | |
771 | st.q SP, FRAME_R(50), r50 | |
772 | st.q SP, FRAME_R(51), r51 | |
773 | st.q SP, FRAME_R(52), r52 | |
774 | st.q SP, FRAME_R(53), r53 | |
775 | st.q SP, FRAME_R(54), r54 | |
776 | st.q SP, FRAME_R(55), r55 | |
777 | st.q SP, FRAME_R(56), r56 | |
778 | st.q SP, FRAME_R(57), r57 | |
779 | st.q SP, FRAME_R(58), r58 | |
780 | st.q SP, FRAME_R(59), r59 | |
781 | st.q SP, FRAME_R(60), r60 | |
782 | st.q SP, FRAME_R(61), r61 | |
783 | st.q SP, FRAME_R(62), r62 | |
784 | ||
785 | /* | |
786 | * Save the S* registers. | |
787 | */ | |
788 | getcon SSR, r61 | |
789 | st.q SP, FRAME_S(FSSR), r61 | |
790 | getcon SPC, r62 | |
791 | st.q SP, FRAME_S(FSPC), r62 | |
792 | movi -1, r62 /* Reset syscall_nr */ | |
793 | st.q SP, FRAME_S(FSYSCALL_ID), r62 | |
794 | ||
795 | /* Save the rest of the target registers */ | |
796 | gettr tr1, r6 | |
797 | st.q SP, FRAME_T(1), r6 | |
798 | gettr tr2, r6 | |
799 | st.q SP, FRAME_T(2), r6 | |
800 | gettr tr3, r6 | |
801 | st.q SP, FRAME_T(3), r6 | |
802 | gettr tr4, r6 | |
803 | st.q SP, FRAME_T(4), r6 | |
804 | gettr tr5, r6 | |
805 | st.q SP, FRAME_T(5), r6 | |
806 | gettr tr6, r6 | |
807 | st.q SP, FRAME_T(6), r6 | |
808 | gettr tr7, r6 | |
809 | st.q SP, FRAME_T(7), r6 | |
810 | ||
811 | ! setup FP so that unwinder can wind back through nested kernel mode | |
812 | ! exceptions | |
813 | add SP, ZERO, r14 | |
814 | ||
1da177e4 LT |
815 | /* For syscall and debug race condition, get TRA now */ |
816 | getcon TRA, r5 | |
817 | ||
818 | /* We are in a safe position to turn SR.BL off, but set IMASK=0xf | |
819 | * Also set FD, to catch FPU usage in the kernel. | |
820 | * | |
821 | * benedict.gaster@superh.com 29/07/2002 | |
822 | * | |
823 | * On all SH5-101 revisions it is unsafe to raise the IMASK and at the | |
824 | * same time change BL from 1->0, as any pending interrupt of a level | |
825 | * higher than he previous value of IMASK will leak through and be | |
826 | * taken unexpectedly. | |
827 | * | |
828 | * To avoid this we raise the IMASK and then issue another PUTCON to | |
829 | * enable interrupts. | |
830 | */ | |
831 | getcon SR, r6 | |
832 | movi SR_IMASK | SR_FD, r7 | |
833 | or r6, r7, r6 | |
834 | putcon r6, SR | |
835 | movi SR_UNBLOCK_EXC, r7 | |
836 | and r6, r7, r6 | |
837 | putcon r6, SR | |
838 | ||
839 | ||
840 | /* Now call the appropriate 3rd level handler */ | |
841 | or r3, ZERO, LINK | |
842 | movi trap_jtable, r3 | |
843 | shlri r2, 3, r2 | |
844 | ldx.l r2, r3, r3 | |
845 | shlri r2, 2, r2 | |
846 | ptabs r3, tr0 | |
847 | or SP, ZERO, r3 | |
848 | blink tr0, ZERO | |
849 | ||
850 | /* | |
851 | * Second level handler for VBR-based exceptions. Post-handlers. | |
852 | * | |
853 | * Post-handlers for interrupts (ret_from_irq), exceptions | |
854 | * (ret_from_exception) and common reentrance doors (restore_all | |
855 | * to get back to the original context, ret_from_syscall loop to | |
856 | * check kernel exiting). | |
857 | * | |
858 | * ret_with_reschedule and work_notifysig are an inner lables of | |
859 | * the ret_from_syscall loop. | |
860 | * | |
861 | * In common to all stack-frame sensitive handlers. | |
862 | * | |
863 | * Inputs: | |
864 | * (SP) struct pt_regs *, original register's frame pointer (basic) | |
865 | * | |
866 | */ | |
867 | .global ret_from_irq | |
868 | ret_from_irq: | |
1da177e4 LT |
869 | ld.q SP, FRAME_S(FSSR), r6 |
870 | shlri r6, 30, r6 | |
871 | andi r6, 1, r6 | |
872 | pta resume_kernel, tr0 | |
873 | bne r6, ZERO, tr0 /* no further checks */ | |
874 | STI() | |
875 | pta ret_with_reschedule, tr0 | |
876 | blink tr0, ZERO /* Do not check softirqs */ | |
877 | ||
878 | .global ret_from_exception | |
879 | ret_from_exception: | |
880 | preempt_stop() | |
881 | ||
1da177e4 LT |
882 | ld.q SP, FRAME_S(FSSR), r6 |
883 | shlri r6, 30, r6 | |
884 | andi r6, 1, r6 | |
885 | pta resume_kernel, tr0 | |
886 | bne r6, ZERO, tr0 /* no further checks */ | |
887 | ||
888 | /* Check softirqs */ | |
889 | ||
890 | #ifdef CONFIG_PREEMPT | |
891 | pta ret_from_syscall, tr0 | |
892 | blink tr0, ZERO | |
893 | ||
894 | resume_kernel: | |
dbce1f64 PM |
895 | CLI() |
896 | ||
1da177e4 LT |
897 | pta restore_all, tr0 |
898 | ||
899 | getcon KCR0, r6 | |
900 | ld.l r6, TI_PRE_COUNT, r7 | |
901 | beq/u r7, ZERO, tr0 | |
902 | ||
903 | need_resched: | |
904 | ld.l r6, TI_FLAGS, r7 | |
905 | movi (1 << TIF_NEED_RESCHED), r8 | |
906 | and r8, r7, r8 | |
907 | bne r8, ZERO, tr0 | |
908 | ||
909 | getcon SR, r7 | |
910 | andi r7, 0xf0, r7 | |
911 | bne r7, ZERO, tr0 | |
912 | ||
dbce1f64 | 913 | movi preempt_schedule_irq, r7 |
1da177e4 LT |
914 | ori r7, 1, r7 |
915 | ptabs r7, tr1 | |
916 | blink tr1, LINK | |
917 | ||
1da177e4 LT |
918 | pta need_resched, tr1 |
919 | blink tr1, ZERO | |
920 | #endif | |
921 | ||
922 | .global ret_from_syscall | |
923 | ret_from_syscall: | |
924 | ||
925 | ret_with_reschedule: | |
926 | getcon KCR0, r6 ! r6 contains current_thread_info | |
927 | ld.l r6, TI_FLAGS, r7 ! r7 contains current_thread_info->flags | |
928 | ||
c18fe9a0 | 929 | movi _TIF_NEED_RESCHED, r8 |
1da177e4 LT |
930 | and r8, r7, r8 |
931 | pta work_resched, tr0 | |
932 | bne r8, ZERO, tr0 | |
933 | ||
934 | pta restore_all, tr1 | |
935 | ||
56bfc42f | 936 | movi _TIF_SIGPENDING, r8 |
1da177e4 LT |
937 | and r8, r7, r8 |
938 | pta work_notifysig, tr0 | |
939 | bne r8, ZERO, tr0 | |
940 | ||
941 | blink tr1, ZERO | |
942 | ||
943 | work_resched: | |
944 | pta ret_from_syscall, tr0 | |
945 | gettr tr0, LINK | |
946 | movi schedule, r6 | |
947 | ptabs r6, tr0 | |
948 | blink tr0, ZERO /* Call schedule(), return on top */ | |
949 | ||
950 | work_notifysig: | |
951 | gettr tr1, LINK | |
952 | ||
ab99c733 | 953 | movi do_notify_resume, r6 |
1da177e4 LT |
954 | ptabs r6, tr0 |
955 | or SP, ZERO, r2 | |
ab99c733 PM |
956 | or r7, ZERO, r3 |
957 | blink tr0, LINK /* Call do_notify_resume(regs, current_thread_info->flags), return here */ | |
1da177e4 LT |
958 | |
959 | restore_all: | |
960 | /* Do prefetches */ | |
961 | ||
962 | ld.q SP, FRAME_T(0), r6 | |
963 | ld.q SP, FRAME_T(1), r7 | |
964 | ld.q SP, FRAME_T(2), r8 | |
965 | ld.q SP, FRAME_T(3), r9 | |
966 | ptabs r6, tr0 | |
967 | ptabs r7, tr1 | |
968 | ptabs r8, tr2 | |
969 | ptabs r9, tr3 | |
970 | ld.q SP, FRAME_T(4), r6 | |
971 | ld.q SP, FRAME_T(5), r7 | |
972 | ld.q SP, FRAME_T(6), r8 | |
973 | ld.q SP, FRAME_T(7), r9 | |
974 | ptabs r6, tr4 | |
975 | ptabs r7, tr5 | |
976 | ptabs r8, tr6 | |
977 | ptabs r9, tr7 | |
978 | ||
979 | ld.q SP, FRAME_R(0), r0 | |
980 | ld.q SP, FRAME_R(1), r1 | |
981 | ld.q SP, FRAME_R(2), r2 | |
982 | ld.q SP, FRAME_R(3), r3 | |
983 | ld.q SP, FRAME_R(4), r4 | |
984 | ld.q SP, FRAME_R(5), r5 | |
985 | ld.q SP, FRAME_R(6), r6 | |
986 | ld.q SP, FRAME_R(7), r7 | |
987 | ld.q SP, FRAME_R(8), r8 | |
988 | ld.q SP, FRAME_R(9), r9 | |
989 | ld.q SP, FRAME_R(10), r10 | |
990 | ld.q SP, FRAME_R(11), r11 | |
991 | ld.q SP, FRAME_R(12), r12 | |
992 | ld.q SP, FRAME_R(13), r13 | |
993 | ld.q SP, FRAME_R(14), r14 | |
994 | ||
995 | ld.q SP, FRAME_R(16), r16 | |
996 | ld.q SP, FRAME_R(17), r17 | |
997 | ld.q SP, FRAME_R(18), r18 | |
998 | ld.q SP, FRAME_R(19), r19 | |
999 | ld.q SP, FRAME_R(20), r20 | |
1000 | ld.q SP, FRAME_R(21), r21 | |
1001 | ld.q SP, FRAME_R(22), r22 | |
1002 | ld.q SP, FRAME_R(23), r23 | |
1003 | ld.q SP, FRAME_R(24), r24 | |
1004 | ld.q SP, FRAME_R(25), r25 | |
1005 | ld.q SP, FRAME_R(26), r26 | |
1006 | ld.q SP, FRAME_R(27), r27 | |
1007 | ld.q SP, FRAME_R(28), r28 | |
1008 | ld.q SP, FRAME_R(29), r29 | |
1009 | ld.q SP, FRAME_R(30), r30 | |
1010 | ld.q SP, FRAME_R(31), r31 | |
1011 | ld.q SP, FRAME_R(32), r32 | |
1012 | ld.q SP, FRAME_R(33), r33 | |
1013 | ld.q SP, FRAME_R(34), r34 | |
1014 | ld.q SP, FRAME_R(35), r35 | |
1015 | ld.q SP, FRAME_R(36), r36 | |
1016 | ld.q SP, FRAME_R(37), r37 | |
1017 | ld.q SP, FRAME_R(38), r38 | |
1018 | ld.q SP, FRAME_R(39), r39 | |
1019 | ld.q SP, FRAME_R(40), r40 | |
1020 | ld.q SP, FRAME_R(41), r41 | |
1021 | ld.q SP, FRAME_R(42), r42 | |
1022 | ld.q SP, FRAME_R(43), r43 | |
1023 | ld.q SP, FRAME_R(44), r44 | |
1024 | ld.q SP, FRAME_R(45), r45 | |
1025 | ld.q SP, FRAME_R(46), r46 | |
1026 | ld.q SP, FRAME_R(47), r47 | |
1027 | ld.q SP, FRAME_R(48), r48 | |
1028 | ld.q SP, FRAME_R(49), r49 | |
1029 | ld.q SP, FRAME_R(50), r50 | |
1030 | ld.q SP, FRAME_R(51), r51 | |
1031 | ld.q SP, FRAME_R(52), r52 | |
1032 | ld.q SP, FRAME_R(53), r53 | |
1033 | ld.q SP, FRAME_R(54), r54 | |
1034 | ld.q SP, FRAME_R(55), r55 | |
1035 | ld.q SP, FRAME_R(56), r56 | |
1036 | ld.q SP, FRAME_R(57), r57 | |
1037 | ld.q SP, FRAME_R(58), r58 | |
1038 | ||
1039 | getcon SR, r59 | |
1040 | movi SR_BLOCK_EXC, r60 | |
1041 | or r59, r60, r59 | |
1042 | putcon r59, SR /* SR.BL = 1, keep nesting out */ | |
1043 | ld.q SP, FRAME_S(FSSR), r61 | |
1044 | ld.q SP, FRAME_S(FSPC), r62 | |
1045 | movi SR_ASID_MASK, r60 | |
1046 | and r59, r60, r59 | |
1047 | andc r61, r60, r61 /* Clear out older ASID */ | |
1048 | or r59, r61, r61 /* Retain current ASID */ | |
1049 | putcon r61, SSR | |
1050 | putcon r62, SPC | |
1051 | ||
1052 | /* Ignore FSYSCALL_ID */ | |
1053 | ||
1054 | ld.q SP, FRAME_R(59), r59 | |
1055 | ld.q SP, FRAME_R(60), r60 | |
1056 | ld.q SP, FRAME_R(61), r61 | |
1057 | ld.q SP, FRAME_R(62), r62 | |
1058 | ||
1059 | /* Last touch */ | |
1060 | ld.q SP, FRAME_R(15), SP | |
1061 | rte | |
1062 | nop | |
1063 | ||
1064 | /* | |
1065 | * Third level handlers for VBR-based exceptions. Adapting args to | |
1066 | * and/or deflecting to fourth level handlers. | |
1067 | * | |
1068 | * Fourth level handlers interface. | |
1069 | * Most are C-coded handlers directly pointed by the trap_jtable. | |
1070 | * (Third = Fourth level) | |
1071 | * Inputs: | |
1072 | * (r2) fault/interrupt code, entry number (e.g. NMI = 14, | |
1073 | * IRL0-3 (0000) = 16, RTLBMISS = 2, SYSCALL = 11, etc ...) | |
1074 | * (r3) struct pt_regs *, original register's frame pointer | |
1075 | * (r4) Event (0 = interrupt, 1 = TLB miss fault, 2 = Not TLB miss fault) | |
1076 | * (r5) TRA control register (for syscall/debug benefit only) | |
1077 | * (LINK) return address | |
1078 | * (SP) = r3 | |
1079 | * | |
1080 | * Kernel TLB fault handlers will get a slightly different interface. | |
1081 | * (r2) struct pt_regs *, original register's frame pointer | |
1082 | * (r3) writeaccess, whether it's a store fault as opposed to load fault | |
1083 | * (r4) execaccess, whether it's a ITLB fault as opposed to DTLB fault | |
1084 | * (r5) Effective Address of fault | |
1085 | * (LINK) return address | |
1086 | * (SP) = r2 | |
1087 | * | |
1088 | * fpu_error_or_IRQ? is a helper to deflect to the right cause. | |
1089 | * | |
1090 | */ | |
ccd80587 | 1091 | #ifdef CONFIG_MMU |
1da177e4 LT |
1092 | tlb_miss_load: |
1093 | or SP, ZERO, r2 | |
1094 | or ZERO, ZERO, r3 /* Read */ | |
1095 | or ZERO, ZERO, r4 /* Data */ | |
1096 | getcon TEA, r5 | |
1097 | pta call_do_page_fault, tr0 | |
1098 | beq ZERO, ZERO, tr0 | |
1099 | ||
1100 | tlb_miss_store: | |
1101 | or SP, ZERO, r2 | |
1102 | movi 1, r3 /* Write */ | |
1103 | or ZERO, ZERO, r4 /* Data */ | |
1104 | getcon TEA, r5 | |
1105 | pta call_do_page_fault, tr0 | |
1106 | beq ZERO, ZERO, tr0 | |
1107 | ||
1108 | itlb_miss_or_IRQ: | |
1109 | pta its_IRQ, tr0 | |
1110 | beqi/u r4, EVENT_INTERRUPT, tr0 | |
1111 | or SP, ZERO, r2 | |
1112 | or ZERO, ZERO, r3 /* Read */ | |
1113 | movi 1, r4 /* Text */ | |
1114 | getcon TEA, r5 | |
1115 | /* Fall through */ | |
1116 | ||
1117 | call_do_page_fault: | |
1118 | movi do_page_fault, r6 | |
1119 | ptabs r6, tr0 | |
1120 | blink tr0, ZERO | |
ccd80587 | 1121 | #endif /* CONFIG_MMU */ |
1da177e4 LT |
1122 | |
1123 | fpu_error_or_IRQA: | |
1124 | pta its_IRQ, tr0 | |
1125 | beqi/l r4, EVENT_INTERRUPT, tr0 | |
1126 | #ifdef CONFIG_SH_FPU | |
d6db8888 | 1127 | movi fpu_state_restore_trap_handler, r6 |
1da177e4 LT |
1128 | #else |
1129 | movi do_exception_error, r6 | |
1130 | #endif | |
1131 | ptabs r6, tr0 | |
1132 | blink tr0, ZERO | |
1133 | ||
1134 | fpu_error_or_IRQB: | |
1135 | pta its_IRQ, tr0 | |
1136 | beqi/l r4, EVENT_INTERRUPT, tr0 | |
1137 | #ifdef CONFIG_SH_FPU | |
d6db8888 | 1138 | movi fpu_state_restore_trap_handler, r6 |
1da177e4 LT |
1139 | #else |
1140 | movi do_exception_error, r6 | |
1141 | #endif | |
1142 | ptabs r6, tr0 | |
1143 | blink tr0, ZERO | |
1144 | ||
1145 | its_IRQ: | |
1146 | movi do_IRQ, r6 | |
1147 | ptabs r6, tr0 | |
1148 | blink tr0, ZERO | |
1149 | ||
1150 | /* | |
1151 | * system_call/unknown_trap third level handler: | |
1152 | * | |
1153 | * Inputs: | |
1154 | * (r2) fault/interrupt code, entry number (TRAP = 11) | |
1155 | * (r3) struct pt_regs *, original register's frame pointer | |
1156 | * (r4) Not used. Event (0=interrupt, 1=TLB miss fault, 2=Not TLB miss fault) | |
1157 | * (r5) TRA Control Reg (0x00xyzzzz: x=1 SYSCALL, y = #args, z=nr) | |
1158 | * (SP) = r3 | |
1159 | * (LINK) return address: ret_from_exception | |
1160 | * (*r3) Syscall parms: SC#, arg0, arg1, ..., arg5 in order (Saved r2/r7) | |
1161 | * | |
1162 | * Outputs: | |
1163 | * (*r3) Syscall reply (Saved r2) | |
1164 | * (LINK) In case of syscall only it can be scrapped. | |
1165 | * Common second level post handler will be ret_from_syscall. | |
1166 | * Common (non-trace) exit point to that is syscall_ret (saving | |
1167 | * result to r2). Common bad exit point is syscall_bad (returning | |
1168 | * ENOSYS then saved to r2). | |
1169 | * | |
1170 | */ | |
1171 | ||
1172 | unknown_trap: | |
1173 | /* Unknown Trap or User Trace */ | |
1174 | movi do_unknown_trapa, r6 | |
1175 | ptabs r6, tr0 | |
1176 | ld.q r3, FRAME_R(9), r2 /* r2 = #arg << 16 | syscall # */ | |
1177 | andi r2, 0x1ff, r2 /* r2 = syscall # */ | |
1178 | blink tr0, LINK | |
1179 | ||
1180 | pta syscall_ret, tr0 | |
1181 | blink tr0, ZERO | |
1182 | ||
1183 | /* New syscall implementation*/ | |
1184 | system_call: | |
1185 | pta unknown_trap, tr0 | |
1186 | or r5, ZERO, r4 /* TRA (=r5) -> r4 */ | |
1187 | shlri r4, 20, r4 | |
1188 | bnei r4, 1, tr0 /* unknown_trap if not 0x1yzzzz */ | |
1189 | ||
1190 | /* It's a system call */ | |
1191 | st.q r3, FRAME_S(FSYSCALL_ID), r5 /* ID (0x1yzzzz) -> stack */ | |
1192 | andi r5, 0x1ff, r5 /* syscall # -> r5 */ | |
1193 | ||
1194 | STI() | |
1195 | ||
1196 | pta syscall_allowed, tr0 | |
1197 | movi NR_syscalls - 1, r4 /* Last valid */ | |
1198 | bgeu/l r4, r5, tr0 | |
1199 | ||
1200 | syscall_bad: | |
1201 | /* Return ENOSYS ! */ | |
1202 | movi -(ENOSYS), r2 /* Fall-through */ | |
1203 | ||
1204 | .global syscall_ret | |
1205 | syscall_ret: | |
1206 | st.q SP, FRAME_R(9), r2 /* Expecting SP back to BASIC frame */ | |
1da177e4 LT |
1207 | ld.q SP, FRAME_S(FSPC), r2 |
1208 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
1209 | st.q SP, FRAME_S(FSPC), r2 | |
1210 | pta ret_from_syscall, tr0 | |
1211 | blink tr0, ZERO | |
1212 | ||
1213 | ||
1214 | /* A different return path for ret_from_fork, because we now need | |
1215 | * to call schedule_tail with the later kernels. Because prev is | |
1216 | * loaded into r2 by switch_to() means we can just call it straight away | |
1217 | */ | |
1218 | ||
1219 | .global ret_from_fork | |
1220 | ret_from_fork: | |
1221 | ||
1222 | movi schedule_tail,r5 | |
1223 | ori r5, 1, r5 | |
1224 | ptabs r5, tr0 | |
1225 | blink tr0, LINK | |
1226 | ||
1da177e4 LT |
1227 | ld.q SP, FRAME_S(FSPC), r2 |
1228 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
1229 | st.q SP, FRAME_S(FSPC), r2 | |
1230 | pta ret_from_syscall, tr0 | |
1231 | blink tr0, ZERO | |
1232 | ||
1da177e4 LT |
1233 | syscall_allowed: |
1234 | /* Use LINK to deflect the exit point, default is syscall_ret */ | |
1235 | pta syscall_ret, tr0 | |
1236 | gettr tr0, LINK | |
1237 | pta syscall_notrace, tr0 | |
1238 | ||
1239 | getcon KCR0, r2 | |
1240 | ld.l r2, TI_FLAGS, r4 | |
cec3fd3e | 1241 | movi _TIF_WORK_SYSCALL_MASK, r6 |
1da177e4 LT |
1242 | and r6, r4, r6 |
1243 | beq/l r6, ZERO, tr0 | |
1244 | ||
1245 | /* Trace it by calling syscall_trace before and after */ | |
ab99c733 | 1246 | movi do_syscall_trace_enter, r4 |
4b27c47c | 1247 | or SP, ZERO, r2 |
1da177e4 LT |
1248 | ptabs r4, tr0 |
1249 | blink tr0, LINK | |
4b27c47c | 1250 | |
ab99c733 PM |
1251 | /* Save the retval */ |
1252 | st.q SP, FRAME_R(2), r2 | |
1253 | ||
1254 | /* Reload syscall number as r5 is trashed by do_syscall_trace_enter */ | |
1da177e4 LT |
1255 | ld.q SP, FRAME_S(FSYSCALL_ID), r5 |
1256 | andi r5, 0x1ff, r5 | |
1257 | ||
1258 | pta syscall_ret_trace, tr0 | |
1259 | gettr tr0, LINK | |
1260 | ||
1261 | syscall_notrace: | |
1262 | /* Now point to the appropriate 4th level syscall handler */ | |
1263 | movi sys_call_table, r4 | |
1264 | shlli r5, 2, r5 | |
1265 | ldx.l r4, r5, r5 | |
1266 | ptabs r5, tr0 | |
1267 | ||
1268 | /* Prepare original args */ | |
1269 | ld.q SP, FRAME_R(2), r2 | |
1270 | ld.q SP, FRAME_R(3), r3 | |
1271 | ld.q SP, FRAME_R(4), r4 | |
1272 | ld.q SP, FRAME_R(5), r5 | |
1273 | ld.q SP, FRAME_R(6), r6 | |
1274 | ld.q SP, FRAME_R(7), r7 | |
1275 | ||
1276 | /* And now the trick for those syscalls requiring regs * ! */ | |
1277 | or SP, ZERO, r8 | |
1278 | ||
1279 | /* Call it */ | |
1280 | blink tr0, ZERO /* LINK is already properly set */ | |
1281 | ||
1282 | syscall_ret_trace: | |
1283 | /* We get back here only if under trace */ | |
1284 | st.q SP, FRAME_R(9), r2 /* Save return value */ | |
1285 | ||
ab99c733 | 1286 | movi do_syscall_trace_leave, LINK |
4b27c47c | 1287 | or SP, ZERO, r2 |
1da177e4 LT |
1288 | ptabs LINK, tr0 |
1289 | blink tr0, LINK | |
1290 | ||
1291 | /* This needs to be done after any syscall tracing */ | |
1292 | ld.q SP, FRAME_S(FSPC), r2 | |
1293 | addi r2, 4, r2 /* Move PC, being pre-execution event */ | |
1294 | st.q SP, FRAME_S(FSPC), r2 | |
1295 | ||
1296 | pta ret_from_syscall, tr0 | |
1297 | blink tr0, ZERO /* Resume normal return sequence */ | |
1298 | ||
1299 | /* | |
1300 | * --- Switch to running under a particular ASID and return the previous ASID value | |
1301 | * --- The caller is assumed to have done a cli before calling this. | |
1302 | * | |
1303 | * Input r2 : new ASID | |
1304 | * Output r2 : old ASID | |
1305 | */ | |
1306 | ||
1307 | .global switch_and_save_asid | |
1308 | switch_and_save_asid: | |
1309 | getcon sr, r0 | |
1310 | movi 255, r4 | |
1311 | shlli r4, 16, r4 /* r4 = mask to select ASID */ | |
1312 | and r0, r4, r3 /* r3 = shifted old ASID */ | |
1313 | andi r2, 255, r2 /* mask down new ASID */ | |
1314 | shlli r2, 16, r2 /* align new ASID against SR.ASID */ | |
1315 | andc r0, r4, r0 /* efface old ASID from SR */ | |
1316 | or r0, r2, r0 /* insert the new ASID */ | |
1317 | putcon r0, ssr | |
1318 | movi 1f, r0 | |
1319 | putcon r0, spc | |
1320 | rte | |
1321 | nop | |
1322 | 1: | |
1323 | ptabs LINK, tr0 | |
1324 | shlri r3, 16, r2 /* r2 = old ASID */ | |
1325 | blink tr0, r63 | |
1326 | ||
1327 | .global route_to_panic_handler | |
1328 | route_to_panic_handler: | |
1329 | /* Switch to real mode, goto panic_handler, don't return. Useful for | |
1330 | last-chance debugging, e.g. if no output wants to go to the console. | |
1331 | */ | |
1332 | ||
36763b22 | 1333 | movi panic_handler - CONFIG_PAGE_OFFSET, r1 |
1da177e4 LT |
1334 | ptabs r1, tr0 |
1335 | pta 1f, tr1 | |
1336 | gettr tr1, r0 | |
1337 | putcon r0, spc | |
1338 | getcon sr, r0 | |
1339 | movi 1, r1 | |
1340 | shlli r1, 31, r1 | |
1341 | andc r0, r1, r0 | |
1342 | putcon r0, ssr | |
1343 | rte | |
1344 | nop | |
1345 | 1: /* Now in real mode */ | |
1346 | blink tr0, r63 | |
1347 | nop | |
1348 | ||
1349 | .global peek_real_address_q | |
1350 | peek_real_address_q: | |
1351 | /* Two args: | |
1352 | r2 : real mode address to peek | |
1353 | r2(out) : result quadword | |
1354 | ||
1355 | This is provided as a cheapskate way of manipulating device | |
0fb849b9 PM |
1356 | registers for debugging (to avoid the need to ioremap the debug |
1357 | module, and to avoid the need to ioremap the watchpoint | |
1da177e4 LT |
1358 | controller in a way that identity maps sufficient bits to avoid the |
1359 | SH5-101 cut2 silicon defect). | |
1360 | ||
1361 | This code is not performance critical | |
1362 | */ | |
1363 | ||
1364 | add.l r2, r63, r2 /* sign extend address */ | |
1365 | getcon sr, r0 /* r0 = saved original SR */ | |
1366 | movi 1, r1 | |
1367 | shlli r1, 28, r1 | |
1368 | or r0, r1, r1 /* r0 with block bit set */ | |
1369 | putcon r1, sr /* now in critical section */ | |
1370 | movi 1, r36 | |
1371 | shlli r36, 31, r36 | |
1372 | andc r1, r36, r1 /* turn sr.mmu off in real mode section */ | |
1373 | ||
1374 | putcon r1, ssr | |
36763b22 | 1375 | movi .peek0 - CONFIG_PAGE_OFFSET, r36 /* real mode target address */ |
1da177e4 LT |
1376 | movi 1f, r37 /* virtual mode return addr */ |
1377 | putcon r36, spc | |
1378 | ||
1379 | synco | |
1380 | rte | |
1381 | nop | |
1382 | ||
1383 | .peek0: /* come here in real mode, don't touch caches!! | |
1384 | still in critical section (sr.bl==1) */ | |
1385 | putcon r0, ssr | |
1386 | putcon r37, spc | |
1387 | /* Here's the actual peek. If the address is bad, all bets are now off | |
1388 | * what will happen (handlers invoked in real-mode = bad news) */ | |
1389 | ld.q r2, 0, r2 | |
1390 | synco | |
1391 | rte /* Back to virtual mode */ | |
1392 | nop | |
1393 | ||
1394 | 1: | |
1395 | ptabs LINK, tr0 | |
1396 | blink tr0, r63 | |
1397 | ||
1398 | .global poke_real_address_q | |
1399 | poke_real_address_q: | |
1400 | /* Two args: | |
1401 | r2 : real mode address to poke | |
1402 | r3 : quadword value to write. | |
1403 | ||
1404 | This is provided as a cheapskate way of manipulating device | |
0fb849b9 PM |
1405 | registers for debugging (to avoid the need to ioremap the debug |
1406 | module, and to avoid the need to ioremap the watchpoint | |
1da177e4 LT |
1407 | controller in a way that identity maps sufficient bits to avoid the |
1408 | SH5-101 cut2 silicon defect). | |
1409 | ||
1410 | This code is not performance critical | |
1411 | */ | |
1412 | ||
1413 | add.l r2, r63, r2 /* sign extend address */ | |
1414 | getcon sr, r0 /* r0 = saved original SR */ | |
1415 | movi 1, r1 | |
1416 | shlli r1, 28, r1 | |
1417 | or r0, r1, r1 /* r0 with block bit set */ | |
1418 | putcon r1, sr /* now in critical section */ | |
1419 | movi 1, r36 | |
1420 | shlli r36, 31, r36 | |
1421 | andc r1, r36, r1 /* turn sr.mmu off in real mode section */ | |
1422 | ||
1423 | putcon r1, ssr | |
36763b22 | 1424 | movi .poke0-CONFIG_PAGE_OFFSET, r36 /* real mode target address */ |
1da177e4 LT |
1425 | movi 1f, r37 /* virtual mode return addr */ |
1426 | putcon r36, spc | |
1427 | ||
1428 | synco | |
1429 | rte | |
1430 | nop | |
1431 | ||
1432 | .poke0: /* come here in real mode, don't touch caches!! | |
1433 | still in critical section (sr.bl==1) */ | |
1434 | putcon r0, ssr | |
1435 | putcon r37, spc | |
1436 | /* Here's the actual poke. If the address is bad, all bets are now off | |
1437 | * what will happen (handlers invoked in real-mode = bad news) */ | |
1438 | st.q r2, 0, r3 | |
1439 | synco | |
1440 | rte /* Back to virtual mode */ | |
1441 | nop | |
1442 | ||
1443 | 1: | |
1444 | ptabs LINK, tr0 | |
1445 | blink tr0, r63 | |
1446 | ||
ccd80587 | 1447 | #ifdef CONFIG_MMU |
1da177e4 LT |
1448 | /* |
1449 | * --- User Access Handling Section | |
1450 | */ | |
1451 | ||
1452 | /* | |
1453 | * User Access support. It all moved to non inlined Assembler | |
1454 | * functions in here. | |
1455 | * | |
1456 | * __kernel_size_t __copy_user(void *__to, const void *__from, | |
1457 | * __kernel_size_t __n) | |
1458 | * | |
1459 | * Inputs: | |
1460 | * (r2) target address | |
1461 | * (r3) source address | |
1462 | * (r4) size in bytes | |
1463 | * | |
1464 | * Ouputs: | |
1465 | * (*r2) target data | |
1466 | * (r2) non-copied bytes | |
1467 | * | |
1468 | * If a fault occurs on the user pointer, bail out early and return the | |
1469 | * number of bytes not copied in r2. | |
1470 | * Strategy : for large blocks, call a real memcpy function which can | |
1471 | * move >1 byte at a time using unaligned ld/st instructions, and can | |
1472 | * manipulate the cache using prefetch + alloco to improve the speed | |
1473 | * further. If a fault occurs in that function, just revert to the | |
1474 | * byte-by-byte approach used for small blocks; this is rare so the | |
1475 | * performance hit for that case does not matter. | |
1476 | * | |
1477 | * For small blocks it's not worth the overhead of setting up and calling | |
1478 | * the memcpy routine; do the copy a byte at a time. | |
1479 | * | |
1480 | */ | |
1481 | .global __copy_user | |
1482 | __copy_user: | |
1483 | pta __copy_user_byte_by_byte, tr1 | |
1484 | movi 16, r0 ! this value is a best guess, should tune it by benchmarking | |
1485 | bge/u r0, r4, tr1 | |
1486 | pta copy_user_memcpy, tr0 | |
1487 | addi SP, -32, SP | |
1488 | /* Save arguments in case we have to fix-up unhandled page fault */ | |
1489 | st.q SP, 0, r2 | |
1490 | st.q SP, 8, r3 | |
1491 | st.q SP, 16, r4 | |
1492 | st.q SP, 24, r35 ! r35 is callee-save | |
1493 | /* Save LINK in a register to reduce RTS time later (otherwise | |
1494 | ld SP,*,LINK;ptabs LINK;trn;blink trn,r63 becomes a critical path) */ | |
1495 | ori LINK, 0, r35 | |
1496 | blink tr0, LINK | |
1497 | ||
1498 | /* Copy completed normally if we get back here */ | |
1499 | ptabs r35, tr0 | |
1500 | ld.q SP, 24, r35 | |
1501 | /* don't restore r2-r4, pointless */ | |
1502 | /* set result=r2 to zero as the copy must have succeeded. */ | |
1503 | or r63, r63, r2 | |
1504 | addi SP, 32, SP | |
1505 | blink tr0, r63 ! RTS | |
1506 | ||
1507 | .global __copy_user_fixup | |
1508 | __copy_user_fixup: | |
1509 | /* Restore stack frame */ | |
1510 | ori r35, 0, LINK | |
1511 | ld.q SP, 24, r35 | |
1512 | ld.q SP, 16, r4 | |
1513 | ld.q SP, 8, r3 | |
1514 | ld.q SP, 0, r2 | |
1515 | addi SP, 32, SP | |
1516 | /* Fall through to original code, in the 'same' state we entered with */ | |
1517 | ||
1518 | /* The slow byte-by-byte method is used if the fast copy traps due to a bad | |
1519 | user address. In that rare case, the speed drop can be tolerated. */ | |
1520 | __copy_user_byte_by_byte: | |
1521 | pta ___copy_user_exit, tr1 | |
1522 | pta ___copy_user1, tr0 | |
1523 | beq/u r4, r63, tr1 /* early exit for zero length copy */ | |
1524 | sub r2, r3, r0 | |
1525 | addi r0, -1, r0 | |
1526 | ||
1527 | ___copy_user1: | |
1528 | ld.b r3, 0, r5 /* Fault address 1 */ | |
1529 | ||
1530 | /* Could rewrite this to use just 1 add, but the second comes 'free' | |
1531 | due to load latency */ | |
1532 | addi r3, 1, r3 | |
1533 | addi r4, -1, r4 /* No real fixup required */ | |
1534 | ___copy_user2: | |
1535 | stx.b r3, r0, r5 /* Fault address 2 */ | |
1536 | bne r4, ZERO, tr0 | |
1537 | ||
1538 | ___copy_user_exit: | |
1539 | or r4, ZERO, r2 | |
1540 | ptabs LINK, tr0 | |
1541 | blink tr0, ZERO | |
1542 | ||
1543 | /* | |
1544 | * __kernel_size_t __clear_user(void *addr, __kernel_size_t size) | |
1545 | * | |
1546 | * Inputs: | |
1547 | * (r2) target address | |
1548 | * (r3) size in bytes | |
1549 | * | |
1550 | * Ouputs: | |
1551 | * (*r2) zero-ed target data | |
1552 | * (r2) non-zero-ed bytes | |
1553 | */ | |
1554 | .global __clear_user | |
1555 | __clear_user: | |
1556 | pta ___clear_user_exit, tr1 | |
1557 | pta ___clear_user1, tr0 | |
1558 | beq/u r3, r63, tr1 | |
1559 | ||
1560 | ___clear_user1: | |
1561 | st.b r2, 0, ZERO /* Fault address */ | |
1562 | addi r2, 1, r2 | |
1563 | addi r3, -1, r3 /* No real fixup required */ | |
1564 | bne r3, ZERO, tr0 | |
1565 | ||
1566 | ___clear_user_exit: | |
1567 | or r3, ZERO, r2 | |
1568 | ptabs LINK, tr0 | |
1569 | blink tr0, ZERO | |
1570 | ||
ccd80587 | 1571 | #endif /* CONFIG_MMU */ |
1da177e4 LT |
1572 | |
1573 | /* | |
1574 | * int __strncpy_from_user(unsigned long __dest, unsigned long __src, | |
1575 | * int __count) | |
1576 | * | |
1577 | * Inputs: | |
1578 | * (r2) target address | |
1579 | * (r3) source address | |
1580 | * (r4) maximum size in bytes | |
1581 | * | |
1582 | * Ouputs: | |
1583 | * (*r2) copied data | |
1584 | * (r2) -EFAULT (in case of faulting) | |
1585 | * copied data (otherwise) | |
1586 | */ | |
1587 | .global __strncpy_from_user | |
1588 | __strncpy_from_user: | |
1589 | pta ___strncpy_from_user1, tr0 | |
1590 | pta ___strncpy_from_user_done, tr1 | |
1591 | or r4, ZERO, r5 /* r5 = original count */ | |
1592 | beq/u r4, r63, tr1 /* early exit if r4==0 */ | |
1593 | movi -(EFAULT), r6 /* r6 = reply, no real fixup */ | |
1594 | or ZERO, ZERO, r7 /* r7 = data, clear top byte of data */ | |
1595 | ||
1596 | ___strncpy_from_user1: | |
1597 | ld.b r3, 0, r7 /* Fault address: only in reading */ | |
1598 | st.b r2, 0, r7 | |
1599 | addi r2, 1, r2 | |
1600 | addi r3, 1, r3 | |
1601 | beq/u ZERO, r7, tr1 | |
1602 | addi r4, -1, r4 /* return real number of copied bytes */ | |
1603 | bne/l ZERO, r4, tr0 | |
1604 | ||
1605 | ___strncpy_from_user_done: | |
1606 | sub r5, r4, r6 /* If done, return copied */ | |
1607 | ||
1608 | ___strncpy_from_user_exit: | |
1609 | or r6, ZERO, r2 | |
1610 | ptabs LINK, tr0 | |
1611 | blink tr0, ZERO | |
1612 | ||
1613 | /* | |
1614 | * extern long __strnlen_user(const char *__s, long __n) | |
1615 | * | |
1616 | * Inputs: | |
1617 | * (r2) source address | |
1618 | * (r3) source size in bytes | |
1619 | * | |
1620 | * Ouputs: | |
1621 | * (r2) -EFAULT (in case of faulting) | |
1622 | * string length (otherwise) | |
1623 | */ | |
1624 | .global __strnlen_user | |
1625 | __strnlen_user: | |
1626 | pta ___strnlen_user_set_reply, tr0 | |
1627 | pta ___strnlen_user1, tr1 | |
1628 | or ZERO, ZERO, r5 /* r5 = counter */ | |
1629 | movi -(EFAULT), r6 /* r6 = reply, no real fixup */ | |
1630 | or ZERO, ZERO, r7 /* r7 = data, clear top byte of data */ | |
1631 | beq r3, ZERO, tr0 | |
1632 | ||
1633 | ___strnlen_user1: | |
1634 | ldx.b r2, r5, r7 /* Fault address: only in reading */ | |
1635 | addi r3, -1, r3 /* No real fixup */ | |
1636 | addi r5, 1, r5 | |
1637 | beq r3, ZERO, tr0 | |
1638 | bne r7, ZERO, tr1 | |
1639 | ! The line below used to be active. This meant led to a junk byte lying between each pair | |
1640 | ! of entries in the argv & envp structures in memory. Whilst the program saw the right data | |
1641 | ! via the argv and envp arguments to main, it meant the 'flat' representation visible through | |
1642 | ! /proc/$pid/cmdline was corrupt, causing trouble with ps, for example. | |
1643 | ! addi r5, 1, r5 /* Include '\0' */ | |
1644 | ||
1645 | ___strnlen_user_set_reply: | |
1646 | or r5, ZERO, r6 /* If done, return counter */ | |
1647 | ||
1648 | ___strnlen_user_exit: | |
1649 | or r6, ZERO, r2 | |
1650 | ptabs LINK, tr0 | |
1651 | blink tr0, ZERO | |
1652 | ||
1653 | /* | |
1654 | * extern long __get_user_asm_?(void *val, long addr) | |
1655 | * | |
1656 | * Inputs: | |
1657 | * (r2) dest address | |
1658 | * (r3) source address (in User Space) | |
1659 | * | |
1660 | * Ouputs: | |
1661 | * (r2) -EFAULT (faulting) | |
1662 | * 0 (not faulting) | |
1663 | */ | |
1664 | .global __get_user_asm_b | |
1665 | __get_user_asm_b: | |
1666 | or r2, ZERO, r4 | |
1667 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1668 | ||
1669 | ___get_user_asm_b1: | |
1670 | ld.b r3, 0, r5 /* r5 = data */ | |
1671 | st.b r4, 0, r5 | |
1672 | or ZERO, ZERO, r2 | |
1673 | ||
1674 | ___get_user_asm_b_exit: | |
1675 | ptabs LINK, tr0 | |
1676 | blink tr0, ZERO | |
1677 | ||
1678 | ||
1679 | .global __get_user_asm_w | |
1680 | __get_user_asm_w: | |
1681 | or r2, ZERO, r4 | |
1682 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1683 | ||
1684 | ___get_user_asm_w1: | |
1685 | ld.w r3, 0, r5 /* r5 = data */ | |
1686 | st.w r4, 0, r5 | |
1687 | or ZERO, ZERO, r2 | |
1688 | ||
1689 | ___get_user_asm_w_exit: | |
1690 | ptabs LINK, tr0 | |
1691 | blink tr0, ZERO | |
1692 | ||
1693 | ||
1694 | .global __get_user_asm_l | |
1695 | __get_user_asm_l: | |
1696 | or r2, ZERO, r4 | |
1697 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1698 | ||
1699 | ___get_user_asm_l1: | |
1700 | ld.l r3, 0, r5 /* r5 = data */ | |
1701 | st.l r4, 0, r5 | |
1702 | or ZERO, ZERO, r2 | |
1703 | ||
1704 | ___get_user_asm_l_exit: | |
1705 | ptabs LINK, tr0 | |
1706 | blink tr0, ZERO | |
1707 | ||
1708 | ||
1709 | .global __get_user_asm_q | |
1710 | __get_user_asm_q: | |
1711 | or r2, ZERO, r4 | |
1712 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1713 | ||
1714 | ___get_user_asm_q1: | |
1715 | ld.q r3, 0, r5 /* r5 = data */ | |
1716 | st.q r4, 0, r5 | |
1717 | or ZERO, ZERO, r2 | |
1718 | ||
1719 | ___get_user_asm_q_exit: | |
1720 | ptabs LINK, tr0 | |
1721 | blink tr0, ZERO | |
1722 | ||
1723 | /* | |
1724 | * extern long __put_user_asm_?(void *pval, long addr) | |
1725 | * | |
1726 | * Inputs: | |
1727 | * (r2) kernel pointer to value | |
1728 | * (r3) dest address (in User Space) | |
1729 | * | |
1730 | * Ouputs: | |
1731 | * (r2) -EFAULT (faulting) | |
1732 | * 0 (not faulting) | |
1733 | */ | |
1734 | .global __put_user_asm_b | |
1735 | __put_user_asm_b: | |
1736 | ld.b r2, 0, r4 /* r4 = data */ | |
1737 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1738 | ||
1739 | ___put_user_asm_b1: | |
1740 | st.b r3, 0, r4 | |
1741 | or ZERO, ZERO, r2 | |
1742 | ||
1743 | ___put_user_asm_b_exit: | |
1744 | ptabs LINK, tr0 | |
1745 | blink tr0, ZERO | |
1746 | ||
1747 | ||
1748 | .global __put_user_asm_w | |
1749 | __put_user_asm_w: | |
1750 | ld.w r2, 0, r4 /* r4 = data */ | |
1751 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1752 | ||
1753 | ___put_user_asm_w1: | |
1754 | st.w r3, 0, r4 | |
1755 | or ZERO, ZERO, r2 | |
1756 | ||
1757 | ___put_user_asm_w_exit: | |
1758 | ptabs LINK, tr0 | |
1759 | blink tr0, ZERO | |
1760 | ||
1761 | ||
1762 | .global __put_user_asm_l | |
1763 | __put_user_asm_l: | |
1764 | ld.l r2, 0, r4 /* r4 = data */ | |
1765 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1766 | ||
1767 | ___put_user_asm_l1: | |
1768 | st.l r3, 0, r4 | |
1769 | or ZERO, ZERO, r2 | |
1770 | ||
1771 | ___put_user_asm_l_exit: | |
1772 | ptabs LINK, tr0 | |
1773 | blink tr0, ZERO | |
1774 | ||
1775 | ||
1776 | .global __put_user_asm_q | |
1777 | __put_user_asm_q: | |
1778 | ld.q r2, 0, r4 /* r4 = data */ | |
1779 | movi -(EFAULT), r2 /* r2 = reply, no real fixup */ | |
1780 | ||
1781 | ___put_user_asm_q1: | |
1782 | st.q r3, 0, r4 | |
1783 | or ZERO, ZERO, r2 | |
1784 | ||
1785 | ___put_user_asm_q_exit: | |
1786 | ptabs LINK, tr0 | |
1787 | blink tr0, ZERO | |
1788 | ||
1789 | panic_stash_regs: | |
1790 | /* The idea is : when we get an unhandled panic, we dump the registers | |
1791 | to a known memory location, the just sit in a tight loop. | |
1792 | This allows the human to look at the memory region through the GDB | |
1793 | session (assuming the debug module's SHwy initiator isn't locked up | |
1794 | or anything), to hopefully analyze the cause of the panic. */ | |
1795 | ||
1796 | /* On entry, former r15 (SP) is in DCR | |
1797 | former r0 is at resvec_saved_area + 0 | |
1798 | former r1 is at resvec_saved_area + 8 | |
1799 | former tr0 is at resvec_saved_area + 32 | |
1800 | DCR is the only register whose value is lost altogether. | |
1801 | */ | |
1802 | ||
1803 | movi 0xffffffff80000000, r0 ! phy of dump area | |
1804 | ld.q SP, 0x000, r1 ! former r0 | |
1805 | st.q r0, 0x000, r1 | |
1806 | ld.q SP, 0x008, r1 ! former r1 | |
1807 | st.q r0, 0x008, r1 | |
1808 | st.q r0, 0x010, r2 | |
1809 | st.q r0, 0x018, r3 | |
1810 | st.q r0, 0x020, r4 | |
1811 | st.q r0, 0x028, r5 | |
1812 | st.q r0, 0x030, r6 | |
1813 | st.q r0, 0x038, r7 | |
1814 | st.q r0, 0x040, r8 | |
1815 | st.q r0, 0x048, r9 | |
1816 | st.q r0, 0x050, r10 | |
1817 | st.q r0, 0x058, r11 | |
1818 | st.q r0, 0x060, r12 | |
1819 | st.q r0, 0x068, r13 | |
1820 | st.q r0, 0x070, r14 | |
1821 | getcon dcr, r14 | |
1822 | st.q r0, 0x078, r14 | |
1823 | st.q r0, 0x080, r16 | |
1824 | st.q r0, 0x088, r17 | |
1825 | st.q r0, 0x090, r18 | |
1826 | st.q r0, 0x098, r19 | |
1827 | st.q r0, 0x0a0, r20 | |
1828 | st.q r0, 0x0a8, r21 | |
1829 | st.q r0, 0x0b0, r22 | |
1830 | st.q r0, 0x0b8, r23 | |
1831 | st.q r0, 0x0c0, r24 | |
1832 | st.q r0, 0x0c8, r25 | |
1833 | st.q r0, 0x0d0, r26 | |
1834 | st.q r0, 0x0d8, r27 | |
1835 | st.q r0, 0x0e0, r28 | |
1836 | st.q r0, 0x0e8, r29 | |
1837 | st.q r0, 0x0f0, r30 | |
1838 | st.q r0, 0x0f8, r31 | |
1839 | st.q r0, 0x100, r32 | |
1840 | st.q r0, 0x108, r33 | |
1841 | st.q r0, 0x110, r34 | |
1842 | st.q r0, 0x118, r35 | |
1843 | st.q r0, 0x120, r36 | |
1844 | st.q r0, 0x128, r37 | |
1845 | st.q r0, 0x130, r38 | |
1846 | st.q r0, 0x138, r39 | |
1847 | st.q r0, 0x140, r40 | |
1848 | st.q r0, 0x148, r41 | |
1849 | st.q r0, 0x150, r42 | |
1850 | st.q r0, 0x158, r43 | |
1851 | st.q r0, 0x160, r44 | |
1852 | st.q r0, 0x168, r45 | |
1853 | st.q r0, 0x170, r46 | |
1854 | st.q r0, 0x178, r47 | |
1855 | st.q r0, 0x180, r48 | |
1856 | st.q r0, 0x188, r49 | |
1857 | st.q r0, 0x190, r50 | |
1858 | st.q r0, 0x198, r51 | |
1859 | st.q r0, 0x1a0, r52 | |
1860 | st.q r0, 0x1a8, r53 | |
1861 | st.q r0, 0x1b0, r54 | |
1862 | st.q r0, 0x1b8, r55 | |
1863 | st.q r0, 0x1c0, r56 | |
1864 | st.q r0, 0x1c8, r57 | |
1865 | st.q r0, 0x1d0, r58 | |
1866 | st.q r0, 0x1d8, r59 | |
1867 | st.q r0, 0x1e0, r60 | |
1868 | st.q r0, 0x1e8, r61 | |
1869 | st.q r0, 0x1f0, r62 | |
1870 | st.q r0, 0x1f8, r63 ! bogus, but for consistency's sake... | |
1871 | ||
1872 | ld.q SP, 0x020, r1 ! former tr0 | |
1873 | st.q r0, 0x200, r1 | |
1874 | gettr tr1, r1 | |
1875 | st.q r0, 0x208, r1 | |
1876 | gettr tr2, r1 | |
1877 | st.q r0, 0x210, r1 | |
1878 | gettr tr3, r1 | |
1879 | st.q r0, 0x218, r1 | |
1880 | gettr tr4, r1 | |
1881 | st.q r0, 0x220, r1 | |
1882 | gettr tr5, r1 | |
1883 | st.q r0, 0x228, r1 | |
1884 | gettr tr6, r1 | |
1885 | st.q r0, 0x230, r1 | |
1886 | gettr tr7, r1 | |
1887 | st.q r0, 0x238, r1 | |
1888 | ||
1889 | getcon sr, r1 | |
1890 | getcon ssr, r2 | |
1891 | getcon pssr, r3 | |
1892 | getcon spc, r4 | |
1893 | getcon pspc, r5 | |
1894 | getcon intevt, r6 | |
1895 | getcon expevt, r7 | |
1896 | getcon pexpevt, r8 | |
1897 | getcon tra, r9 | |
1898 | getcon tea, r10 | |
1899 | getcon kcr0, r11 | |
1900 | getcon kcr1, r12 | |
1901 | getcon vbr, r13 | |
1902 | getcon resvec, r14 | |
1903 | ||
1904 | st.q r0, 0x240, r1 | |
1905 | st.q r0, 0x248, r2 | |
1906 | st.q r0, 0x250, r3 | |
1907 | st.q r0, 0x258, r4 | |
1908 | st.q r0, 0x260, r5 | |
1909 | st.q r0, 0x268, r6 | |
1910 | st.q r0, 0x270, r7 | |
1911 | st.q r0, 0x278, r8 | |
1912 | st.q r0, 0x280, r9 | |
1913 | st.q r0, 0x288, r10 | |
1914 | st.q r0, 0x290, r11 | |
1915 | st.q r0, 0x298, r12 | |
1916 | st.q r0, 0x2a0, r13 | |
1917 | st.q r0, 0x2a8, r14 | |
1918 | ||
1919 | getcon SPC,r2 | |
1920 | getcon SSR,r3 | |
1921 | getcon EXPEVT,r4 | |
1922 | /* Prepare to jump to C - physical address */ | |
36763b22 | 1923 | movi panic_handler-CONFIG_PAGE_OFFSET, r1 |
1da177e4 LT |
1924 | ori r1, 1, r1 |
1925 | ptabs r1, tr0 | |
1926 | getcon DCR, SP | |
1927 | blink tr0, ZERO | |
1928 | nop | |
1929 | nop | |
1930 | nop | |
1931 | nop | |
1932 | ||
1933 | ||
1934 | ||
1935 | ||
1936 | /* | |
1937 | * --- Signal Handling Section | |
1938 | */ | |
1939 | ||
1940 | /* | |
1941 | * extern long long _sa_default_rt_restorer | |
1942 | * extern long long _sa_default_restorer | |
1943 | * | |
1944 | * or, better, | |
1945 | * | |
1946 | * extern void _sa_default_rt_restorer(void) | |
1947 | * extern void _sa_default_restorer(void) | |
1948 | * | |
1949 | * Code prototypes to do a sys_rt_sigreturn() or sys_sysreturn() | |
1950 | * from user space. Copied into user space by signal management. | |
1951 | * Both must be quad aligned and 2 quad long (4 instructions). | |
1952 | * | |
1953 | */ | |
1954 | .balign 8 | |
1955 | .global sa_default_rt_restorer | |
1956 | sa_default_rt_restorer: | |
1957 | movi 0x10, r9 | |
1958 | shori __NR_rt_sigreturn, r9 | |
1959 | trapa r9 | |
1960 | nop | |
1961 | ||
1962 | .balign 8 | |
1963 | .global sa_default_restorer | |
1964 | sa_default_restorer: | |
1965 | movi 0x10, r9 | |
1966 | shori __NR_sigreturn, r9 | |
1967 | trapa r9 | |
1968 | nop | |
1969 | ||
1970 | /* | |
1971 | * --- __ex_table Section | |
1972 | */ | |
1973 | ||
1974 | /* | |
1975 | * User Access Exception Table. | |
1976 | */ | |
1977 | .section __ex_table, "a" | |
1978 | ||
1979 | .global asm_uaccess_start /* Just a marker */ | |
1980 | asm_uaccess_start: | |
1981 | ||
ccd80587 | 1982 | #ifdef CONFIG_MMU |
1da177e4 LT |
1983 | .long ___copy_user1, ___copy_user_exit |
1984 | .long ___copy_user2, ___copy_user_exit | |
1985 | .long ___clear_user1, ___clear_user_exit | |
ccd80587 | 1986 | #endif |
1da177e4 LT |
1987 | .long ___strncpy_from_user1, ___strncpy_from_user_exit |
1988 | .long ___strnlen_user1, ___strnlen_user_exit | |
1989 | .long ___get_user_asm_b1, ___get_user_asm_b_exit | |
1990 | .long ___get_user_asm_w1, ___get_user_asm_w_exit | |
1991 | .long ___get_user_asm_l1, ___get_user_asm_l_exit | |
1992 | .long ___get_user_asm_q1, ___get_user_asm_q_exit | |
1993 | .long ___put_user_asm_b1, ___put_user_asm_b_exit | |
1994 | .long ___put_user_asm_w1, ___put_user_asm_w_exit | |
1995 | .long ___put_user_asm_l1, ___put_user_asm_l_exit | |
1996 | .long ___put_user_asm_q1, ___put_user_asm_q_exit | |
1997 | ||
1998 | .global asm_uaccess_end /* Just a marker */ | |
1999 | asm_uaccess_end: | |
2000 | ||
2001 | ||
2002 | ||
2003 | ||
2004 | /* | |
882016ff | 2005 | * --- .init.text Section |
1da177e4 LT |
2006 | */ |
2007 | ||
882016ff | 2008 | __INIT |
1da177e4 LT |
2009 | |
2010 | /* | |
2011 | * void trap_init (void) | |
2012 | * | |
2013 | */ | |
2014 | .global trap_init | |
2015 | trap_init: | |
2016 | addi SP, -24, SP /* Room to save r28/r29/r30 */ | |
2017 | st.q SP, 0, r28 | |
2018 | st.q SP, 8, r29 | |
2019 | st.q SP, 16, r30 | |
2020 | ||
2021 | /* Set VBR and RESVEC */ | |
2022 | movi LVBR_block, r19 | |
2023 | andi r19, -4, r19 /* reset MMUOFF + reserved */ | |
2024 | /* For RESVEC exceptions we force the MMU off, which means we need the | |
2025 | physical address. */ | |
36763b22 | 2026 | movi LRESVEC_block-CONFIG_PAGE_OFFSET, r20 |
1da177e4 LT |
2027 | andi r20, -4, r20 /* reset reserved */ |
2028 | ori r20, 1, r20 /* set MMUOFF */ | |
2029 | putcon r19, VBR | |
2030 | putcon r20, RESVEC | |
2031 | ||
2032 | /* Sanity check */ | |
2033 | movi LVBR_block_end, r21 | |
2034 | andi r21, -4, r21 | |
2035 | movi BLOCK_SIZE, r29 /* r29 = expected size */ | |
2036 | or r19, ZERO, r30 | |
2037 | add r19, r29, r19 | |
2038 | ||
2039 | /* | |
2040 | * Ugly, but better loop forever now than crash afterwards. | |
2041 | * We should print a message, but if we touch LVBR or | |
2042 | * LRESVEC blocks we should not be surprised if we get stuck | |
2043 | * in trap_init(). | |
2044 | */ | |
2045 | pta trap_init_loop, tr1 | |
2046 | gettr tr1, r28 /* r28 = trap_init_loop */ | |
2047 | sub r21, r30, r30 /* r30 = actual size */ | |
2048 | ||
2049 | /* | |
2050 | * VBR/RESVEC handlers overlap by being bigger than | |
2051 | * allowed. Very bad. Just loop forever. | |
2052 | * (r28) panic/loop address | |
2053 | * (r29) expected size | |
2054 | * (r30) actual size | |
2055 | */ | |
2056 | trap_init_loop: | |
2057 | bne r19, r21, tr1 | |
2058 | ||
2059 | /* Now that exception vectors are set up reset SR.BL */ | |
2060 | getcon SR, r22 | |
2061 | movi SR_UNBLOCK_EXC, r23 | |
2062 | and r22, r23, r22 | |
2063 | putcon r22, SR | |
2064 | ||
2065 | addi SP, 24, SP | |
2066 | ptabs LINK, tr0 | |
2067 | blink tr0, ZERO | |
2068 |