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sparc64: prepare module_64.c for unification
[deliverable/linux.git] / arch / sparc / kernel / entry.S
1 /* arch/sparc/kernel/entry.S: Sparc trap low-level entry points.
2 *
3 * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
6 * Copyright (C) 1996-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
8 */
9
10 #include <linux/errno.h>
11
12 #include <asm/head.h>
13 #include <asm/asi.h>
14 #include <asm/smp.h>
15 #include <asm/contregs.h>
16 #include <asm/ptrace.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/psr.h>
19 #include <asm/vaddrs.h>
20 #include <asm/memreg.h>
21 #include <asm/page.h>
22 #include <asm/pgtable.h>
23 #include <asm/pgtsun4c.h>
24 #include <asm/winmacro.h>
25 #include <asm/signal.h>
26 #include <asm/obio.h>
27 #include <asm/mxcc.h>
28 #include <asm/thread_info.h>
29 #include <asm/param.h>
30 #include <asm/unistd.h>
31
32 #include <asm/asmmacro.h>
33
34 #define curptr g6
35
36 /* These are just handy. */
37 #define _SV save %sp, -STACKFRAME_SZ, %sp
38 #define _RS restore
39
40 #define FLUSH_ALL_KERNEL_WINDOWS \
41 _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
42 _RS; _RS; _RS; _RS; _RS; _RS; _RS;
43
44 .text
45
46 #ifdef CONFIG_KGDB
47 .align 4
48 .globl arch_kgdb_breakpoint
49 .type arch_kgdb_breakpoint,#function
50 arch_kgdb_breakpoint:
51 ta 0x7d
52 retl
53 nop
54 .size arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
55 #endif
56
57 #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
58 .align 4
59 .globl floppy_hardint
60 floppy_hardint:
61 /*
62 * This code cannot touch registers %l0 %l1 and %l2
63 * because SAVE_ALL depends on their values. It depends
64 * on %l3 also, but we regenerate it before a call.
65 * Other registers are:
66 * %l3 -- base address of fdc registers
67 * %l4 -- pdma_vaddr
68 * %l5 -- scratch for ld/st address
69 * %l6 -- pdma_size
70 * %l7 -- scratch [floppy byte, ld/st address, aux. data]
71 */
72
73 /* Do we have work to do? */
74 sethi %hi(doing_pdma), %l7
75 ld [%l7 + %lo(doing_pdma)], %l7
76 cmp %l7, 0
77 be floppy_dosoftint
78 nop
79
80 /* Load fdc register base */
81 sethi %hi(fdc_status), %l3
82 ld [%l3 + %lo(fdc_status)], %l3
83
84 /* Setup register addresses */
85 sethi %hi(pdma_vaddr), %l5 ! transfer buffer
86 ld [%l5 + %lo(pdma_vaddr)], %l4
87 sethi %hi(pdma_size), %l5 ! bytes to go
88 ld [%l5 + %lo(pdma_size)], %l6
89 next_byte:
90 ldub [%l3], %l7
91
92 andcc %l7, 0x80, %g0 ! Does fifo still have data
93 bz floppy_fifo_emptied ! fifo has been emptied...
94 andcc %l7, 0x20, %g0 ! in non-dma mode still?
95 bz floppy_overrun ! nope, overrun
96 andcc %l7, 0x40, %g0 ! 0=write 1=read
97 bz floppy_write
98 sub %l6, 0x1, %l6
99
100 /* Ok, actually read this byte */
101 ldub [%l3 + 1], %l7
102 orcc %g0, %l6, %g0
103 stb %l7, [%l4]
104 bne next_byte
105 add %l4, 0x1, %l4
106
107 b floppy_tdone
108 nop
109
110 floppy_write:
111 /* Ok, actually write this byte */
112 ldub [%l4], %l7
113 orcc %g0, %l6, %g0
114 stb %l7, [%l3 + 1]
115 bne next_byte
116 add %l4, 0x1, %l4
117
118 /* fall through... */
119 floppy_tdone:
120 sethi %hi(pdma_vaddr), %l5
121 st %l4, [%l5 + %lo(pdma_vaddr)]
122 sethi %hi(pdma_size), %l5
123 st %l6, [%l5 + %lo(pdma_size)]
124 /* Flip terminal count pin */
125 set auxio_register, %l7
126 ld [%l7], %l7
127
128 set sparc_cpu_model, %l5
129 ld [%l5], %l5
130 subcc %l5, 1, %g0 /* enum { sun4c = 1 }; */
131 be 1f
132 ldub [%l7], %l5
133
134 or %l5, 0xc2, %l5
135 stb %l5, [%l7]
136 andn %l5, 0x02, %l5
137 b 2f
138 nop
139
140 1:
141 or %l5, 0xf4, %l5
142 stb %l5, [%l7]
143 andn %l5, 0x04, %l5
144
145 2:
146 /* Kill some time so the bits set */
147 WRITE_PAUSE
148 WRITE_PAUSE
149
150 stb %l5, [%l7]
151
152 /* Prevent recursion */
153 sethi %hi(doing_pdma), %l7
154 b floppy_dosoftint
155 st %g0, [%l7 + %lo(doing_pdma)]
156
157 /* We emptied the FIFO, but we haven't read everything
158 * as of yet. Store the current transfer address and
159 * bytes left to read so we can continue when the next
160 * fast IRQ comes in.
161 */
162 floppy_fifo_emptied:
163 sethi %hi(pdma_vaddr), %l5
164 st %l4, [%l5 + %lo(pdma_vaddr)]
165 sethi %hi(pdma_size), %l7
166 st %l6, [%l7 + %lo(pdma_size)]
167
168 /* Restore condition codes */
169 wr %l0, 0x0, %psr
170 WRITE_PAUSE
171
172 jmp %l1
173 rett %l2
174
175 floppy_overrun:
176 sethi %hi(pdma_vaddr), %l5
177 st %l4, [%l5 + %lo(pdma_vaddr)]
178 sethi %hi(pdma_size), %l5
179 st %l6, [%l5 + %lo(pdma_size)]
180 /* Prevent recursion */
181 sethi %hi(doing_pdma), %l7
182 st %g0, [%l7 + %lo(doing_pdma)]
183
184 /* fall through... */
185 floppy_dosoftint:
186 rd %wim, %l3
187 SAVE_ALL
188
189 /* Set all IRQs off. */
190 or %l0, PSR_PIL, %l4
191 wr %l4, 0x0, %psr
192 WRITE_PAUSE
193 wr %l4, PSR_ET, %psr
194 WRITE_PAUSE
195
196 mov 11, %o0 ! floppy irq level (unused anyway)
197 mov %g0, %o1 ! devid is not used in fast interrupts
198 call sparc_floppy_irq
199 add %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
200
201 RESTORE_ALL
202
203 #endif /* (CONFIG_BLK_DEV_FD) */
204
205 /* Bad trap handler */
206 .globl bad_trap_handler
207 bad_trap_handler:
208 SAVE_ALL
209
210 wr %l0, PSR_ET, %psr
211 WRITE_PAUSE
212
213 add %sp, STACKFRAME_SZ, %o0 ! pt_regs
214 call do_hw_interrupt
215 mov %l7, %o1 ! trap number
216
217 RESTORE_ALL
218
219 /* For now all IRQ's not registered get sent here. handler_irq() will
220 * see if a routine is registered to handle this interrupt and if not
221 * it will say so on the console.
222 */
223
224 .align 4
225 .globl real_irq_entry, patch_handler_irq
226 real_irq_entry:
227 SAVE_ALL
228
229 #ifdef CONFIG_SMP
230 .globl patchme_maybe_smp_msg
231
232 cmp %l7, 12
233 patchme_maybe_smp_msg:
234 bgu maybe_smp4m_msg
235 nop
236 #endif
237
238 real_irq_continue:
239 or %l0, PSR_PIL, %g2
240 wr %g2, 0x0, %psr
241 WRITE_PAUSE
242 wr %g2, PSR_ET, %psr
243 WRITE_PAUSE
244 mov %l7, %o0 ! irq level
245 patch_handler_irq:
246 call handler_irq
247 add %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
248 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
249 wr %g2, PSR_ET, %psr ! keep ET up
250 WRITE_PAUSE
251
252 RESTORE_ALL
253
254 #ifdef CONFIG_SMP
255 /* SMP per-cpu ticker interrupts are handled specially. */
256 smp4m_ticker:
257 bne real_irq_continue+4
258 or %l0, PSR_PIL, %g2
259 wr %g2, 0x0, %psr
260 WRITE_PAUSE
261 wr %g2, PSR_ET, %psr
262 WRITE_PAUSE
263 call smp4m_percpu_timer_interrupt
264 add %sp, STACKFRAME_SZ, %o0
265 wr %l0, PSR_ET, %psr
266 WRITE_PAUSE
267 RESTORE_ALL
268
269 /* Here is where we check for possible SMP IPI passed to us
270 * on some level other than 15 which is the NMI and only used
271 * for cross calls. That has a separate entry point below.
272 */
273 maybe_smp4m_msg:
274 GET_PROCESSOR4M_ID(o3)
275 sethi %hi(sun4m_irq_percpu), %l5
276 sll %o3, 2, %o3
277 or %l5, %lo(sun4m_irq_percpu), %o5
278 sethi %hi(0x40000000), %o2
279 ld [%o5 + %o3], %o1
280 ld [%o1 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
281 andcc %o3, %o2, %g0
282 be,a smp4m_ticker
283 cmp %l7, 14
284 st %o2, [%o1 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x40000000
285 WRITE_PAUSE
286 ld [%o1 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
287 WRITE_PAUSE
288 or %l0, PSR_PIL, %l4
289 wr %l4, 0x0, %psr
290 WRITE_PAUSE
291 wr %l4, PSR_ET, %psr
292 WRITE_PAUSE
293 call smp_reschedule_irq
294 nop
295
296 RESTORE_ALL
297
298 .align 4
299 .globl linux_trap_ipi15_sun4m
300 linux_trap_ipi15_sun4m:
301 SAVE_ALL
302 sethi %hi(0x80000000), %o2
303 GET_PROCESSOR4M_ID(o0)
304 sethi %hi(sun4m_irq_percpu), %l5
305 or %l5, %lo(sun4m_irq_percpu), %o5
306 sll %o0, 2, %o0
307 ld [%o5 + %o0], %o5
308 ld [%o5 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
309 andcc %o3, %o2, %g0
310 be 1f ! Must be an NMI async memory error
311 st %o2, [%o5 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x80000000
312 WRITE_PAUSE
313 ld [%o5 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
314 WRITE_PAUSE
315 or %l0, PSR_PIL, %l4
316 wr %l4, 0x0, %psr
317 WRITE_PAUSE
318 wr %l4, PSR_ET, %psr
319 WRITE_PAUSE
320 call smp4m_cross_call_irq
321 nop
322 b ret_trap_lockless_ipi
323 clr %l6
324 1:
325 /* NMI async memory error handling. */
326 sethi %hi(0x80000000), %l4
327 sethi %hi(sun4m_irq_global), %o5
328 ld [%o5 + %lo(sun4m_irq_global)], %l5
329 st %l4, [%l5 + 0x0c] ! sun4m_irq_global->mask_set=0x80000000
330 WRITE_PAUSE
331 ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
332 WRITE_PAUSE
333 or %l0, PSR_PIL, %l4
334 wr %l4, 0x0, %psr
335 WRITE_PAUSE
336 wr %l4, PSR_ET, %psr
337 WRITE_PAUSE
338 call sun4m_nmi
339 nop
340 st %l4, [%l5 + 0x08] ! sun4m_irq_global->mask_clear=0x80000000
341 WRITE_PAUSE
342 ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
343 WRITE_PAUSE
344 RESTORE_ALL
345
346 .globl smp4d_ticker
347 /* SMP per-cpu ticker interrupts are handled specially. */
348 smp4d_ticker:
349 SAVE_ALL
350 or %l0, PSR_PIL, %g2
351 sethi %hi(CC_ICLR), %o0
352 sethi %hi(1 << 14), %o1
353 or %o0, %lo(CC_ICLR), %o0
354 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
355 wr %g2, 0x0, %psr
356 WRITE_PAUSE
357 wr %g2, PSR_ET, %psr
358 WRITE_PAUSE
359 call smp4d_percpu_timer_interrupt
360 add %sp, STACKFRAME_SZ, %o0
361 wr %l0, PSR_ET, %psr
362 WRITE_PAUSE
363 RESTORE_ALL
364
365 .align 4
366 .globl linux_trap_ipi15_sun4d
367 linux_trap_ipi15_sun4d:
368 SAVE_ALL
369 sethi %hi(CC_BASE), %o4
370 sethi %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
371 or %o4, (CC_EREG - CC_BASE), %o0
372 ldda [%o0] ASI_M_MXCC, %o0
373 andcc %o0, %o2, %g0
374 bne 1f
375 sethi %hi(BB_STAT2), %o2
376 lduba [%o2] ASI_M_CTL, %o2
377 andcc %o2, BB_STAT2_MASK, %g0
378 bne 2f
379 or %o4, (CC_ICLR - CC_BASE), %o0
380 sethi %hi(1 << 15), %o1
381 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 15 in MXCC's ICLR */
382 or %l0, PSR_PIL, %l4
383 wr %l4, 0x0, %psr
384 WRITE_PAUSE
385 wr %l4, PSR_ET, %psr
386 WRITE_PAUSE
387 call smp4d_cross_call_irq
388 nop
389 b ret_trap_lockless_ipi
390 clr %l6
391
392 1: /* MXCC error */
393 2: /* BB error */
394 /* Disable PIL 15 */
395 set CC_IMSK, %l4
396 lduha [%l4] ASI_M_MXCC, %l5
397 sethi %hi(1 << 15), %l7
398 or %l5, %l7, %l5
399 stha %l5, [%l4] ASI_M_MXCC
400 /* FIXME */
401 1: b,a 1b
402
403 #endif /* CONFIG_SMP */
404
405 /* This routine handles illegal instructions and privileged
406 * instruction attempts from user code.
407 */
408 .align 4
409 .globl bad_instruction
410 bad_instruction:
411 sethi %hi(0xc1f80000), %l4
412 ld [%l1], %l5
413 sethi %hi(0x81d80000), %l7
414 and %l5, %l4, %l5
415 cmp %l5, %l7
416 be 1f
417 SAVE_ALL
418
419 wr %l0, PSR_ET, %psr ! re-enable traps
420 WRITE_PAUSE
421
422 add %sp, STACKFRAME_SZ, %o0
423 mov %l1, %o1
424 mov %l2, %o2
425 call do_illegal_instruction
426 mov %l0, %o3
427
428 RESTORE_ALL
429
430 1: /* unimplemented flush - just skip */
431 jmpl %l2, %g0
432 rett %l2 + 4
433
434 .align 4
435 .globl priv_instruction
436 priv_instruction:
437 SAVE_ALL
438
439 wr %l0, PSR_ET, %psr
440 WRITE_PAUSE
441
442 add %sp, STACKFRAME_SZ, %o0
443 mov %l1, %o1
444 mov %l2, %o2
445 call do_priv_instruction
446 mov %l0, %o3
447
448 RESTORE_ALL
449
450 /* This routine handles unaligned data accesses. */
451 .align 4
452 .globl mna_handler
453 mna_handler:
454 andcc %l0, PSR_PS, %g0
455 be mna_fromuser
456 nop
457
458 SAVE_ALL
459
460 wr %l0, PSR_ET, %psr
461 WRITE_PAUSE
462
463 ld [%l1], %o1
464 call kernel_unaligned_trap
465 add %sp, STACKFRAME_SZ, %o0
466
467 RESTORE_ALL
468
469 mna_fromuser:
470 SAVE_ALL
471
472 wr %l0, PSR_ET, %psr ! re-enable traps
473 WRITE_PAUSE
474
475 ld [%l1], %o1
476 call user_unaligned_trap
477 add %sp, STACKFRAME_SZ, %o0
478
479 RESTORE_ALL
480
481 /* This routine handles floating point disabled traps. */
482 .align 4
483 .globl fpd_trap_handler
484 fpd_trap_handler:
485 SAVE_ALL
486
487 wr %l0, PSR_ET, %psr ! re-enable traps
488 WRITE_PAUSE
489
490 add %sp, STACKFRAME_SZ, %o0
491 mov %l1, %o1
492 mov %l2, %o2
493 call do_fpd_trap
494 mov %l0, %o3
495
496 RESTORE_ALL
497
498 /* This routine handles Floating Point Exceptions. */
499 .align 4
500 .globl fpe_trap_handler
501 fpe_trap_handler:
502 set fpsave_magic, %l5
503 cmp %l1, %l5
504 be 1f
505 sethi %hi(fpsave), %l5
506 or %l5, %lo(fpsave), %l5
507 cmp %l1, %l5
508 bne 2f
509 sethi %hi(fpsave_catch2), %l5
510 or %l5, %lo(fpsave_catch2), %l5
511 wr %l0, 0x0, %psr
512 WRITE_PAUSE
513 jmp %l5
514 rett %l5 + 4
515 1:
516 sethi %hi(fpsave_catch), %l5
517 or %l5, %lo(fpsave_catch), %l5
518 wr %l0, 0x0, %psr
519 WRITE_PAUSE
520 jmp %l5
521 rett %l5 + 4
522
523 2:
524 SAVE_ALL
525
526 wr %l0, PSR_ET, %psr ! re-enable traps
527 WRITE_PAUSE
528
529 add %sp, STACKFRAME_SZ, %o0
530 mov %l1, %o1
531 mov %l2, %o2
532 call do_fpe_trap
533 mov %l0, %o3
534
535 RESTORE_ALL
536
537 /* This routine handles Tag Overflow Exceptions. */
538 .align 4
539 .globl do_tag_overflow
540 do_tag_overflow:
541 SAVE_ALL
542
543 wr %l0, PSR_ET, %psr ! re-enable traps
544 WRITE_PAUSE
545
546 add %sp, STACKFRAME_SZ, %o0
547 mov %l1, %o1
548 mov %l2, %o2
549 call handle_tag_overflow
550 mov %l0, %o3
551
552 RESTORE_ALL
553
554 /* This routine handles Watchpoint Exceptions. */
555 .align 4
556 .globl do_watchpoint
557 do_watchpoint:
558 SAVE_ALL
559
560 wr %l0, PSR_ET, %psr ! re-enable traps
561 WRITE_PAUSE
562
563 add %sp, STACKFRAME_SZ, %o0
564 mov %l1, %o1
565 mov %l2, %o2
566 call handle_watchpoint
567 mov %l0, %o3
568
569 RESTORE_ALL
570
571 /* This routine handles Register Access Exceptions. */
572 .align 4
573 .globl do_reg_access
574 do_reg_access:
575 SAVE_ALL
576
577 wr %l0, PSR_ET, %psr ! re-enable traps
578 WRITE_PAUSE
579
580 add %sp, STACKFRAME_SZ, %o0
581 mov %l1, %o1
582 mov %l2, %o2
583 call handle_reg_access
584 mov %l0, %o3
585
586 RESTORE_ALL
587
588 /* This routine handles Co-Processor Disabled Exceptions. */
589 .align 4
590 .globl do_cp_disabled
591 do_cp_disabled:
592 SAVE_ALL
593
594 wr %l0, PSR_ET, %psr ! re-enable traps
595 WRITE_PAUSE
596
597 add %sp, STACKFRAME_SZ, %o0
598 mov %l1, %o1
599 mov %l2, %o2
600 call handle_cp_disabled
601 mov %l0, %o3
602
603 RESTORE_ALL
604
605 /* This routine handles Co-Processor Exceptions. */
606 .align 4
607 .globl do_cp_exception
608 do_cp_exception:
609 SAVE_ALL
610
611 wr %l0, PSR_ET, %psr ! re-enable traps
612 WRITE_PAUSE
613
614 add %sp, STACKFRAME_SZ, %o0
615 mov %l1, %o1
616 mov %l2, %o2
617 call handle_cp_exception
618 mov %l0, %o3
619
620 RESTORE_ALL
621
622 /* This routine handles Hardware Divide By Zero Exceptions. */
623 .align 4
624 .globl do_hw_divzero
625 do_hw_divzero:
626 SAVE_ALL
627
628 wr %l0, PSR_ET, %psr ! re-enable traps
629 WRITE_PAUSE
630
631 add %sp, STACKFRAME_SZ, %o0
632 mov %l1, %o1
633 mov %l2, %o2
634 call handle_hw_divzero
635 mov %l0, %o3
636
637 RESTORE_ALL
638
639 .align 4
640 .globl do_flush_windows
641 do_flush_windows:
642 SAVE_ALL
643
644 wr %l0, PSR_ET, %psr
645 WRITE_PAUSE
646
647 andcc %l0, PSR_PS, %g0
648 bne dfw_kernel
649 nop
650
651 call flush_user_windows
652 nop
653
654 /* Advance over the trap instruction. */
655 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
656 add %l1, 0x4, %l2
657 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
658 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
659
660 RESTORE_ALL
661
662 .globl flush_patch_one
663
664 /* We get these for debugging routines using __builtin_return_address() */
665 dfw_kernel:
666 flush_patch_one:
667 FLUSH_ALL_KERNEL_WINDOWS
668
669 /* Advance over the trap instruction. */
670 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
671 add %l1, 0x4, %l2
672 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
673 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
674
675 RESTORE_ALL
676
677 /* The getcc software trap. The user wants the condition codes from
678 * the %psr in register %g1.
679 */
680
681 .align 4
682 .globl getcc_trap_handler
683 getcc_trap_handler:
684 srl %l0, 20, %g1 ! give user
685 and %g1, 0xf, %g1 ! only ICC bits in %psr
686 jmp %l2 ! advance over trap instruction
687 rett %l2 + 0x4 ! like this...
688
689 /* The setcc software trap. The user has condition codes in %g1
690 * that it would like placed in the %psr. Be careful not to flip
691 * any unintentional bits!
692 */
693
694 .align 4
695 .globl setcc_trap_handler
696 setcc_trap_handler:
697 sll %g1, 0x14, %l4
698 set PSR_ICC, %l5
699 andn %l0, %l5, %l0 ! clear ICC bits in %psr
700 and %l4, %l5, %l4 ! clear non-ICC bits in user value
701 or %l4, %l0, %l4 ! or them in... mix mix mix
702
703 wr %l4, 0x0, %psr ! set new %psr
704 WRITE_PAUSE ! TI scumbags...
705
706 jmp %l2 ! advance over trap instruction
707 rett %l2 + 0x4 ! like this...
708
709 .align 4
710 .globl linux_trap_nmi_sun4c
711 linux_trap_nmi_sun4c:
712 SAVE_ALL
713
714 /* Ugh, we need to clear the IRQ line. This is now
715 * a very sun4c specific trap handler...
716 */
717 sethi %hi(interrupt_enable), %l5
718 ld [%l5 + %lo(interrupt_enable)], %l5
719 ldub [%l5], %l6
720 andn %l6, INTS_ENAB, %l6
721 stb %l6, [%l5]
722
723 /* Now it is safe to re-enable traps without recursion. */
724 or %l0, PSR_PIL, %l0
725 wr %l0, PSR_ET, %psr
726 WRITE_PAUSE
727
728 /* Now call the c-code with the pt_regs frame ptr and the
729 * memory error registers as arguments. The ordering chosen
730 * here is due to unlatching semantics.
731 */
732 sethi %hi(AC_SYNC_ERR), %o0
733 add %o0, 0x4, %o0
734 lda [%o0] ASI_CONTROL, %o2 ! sync vaddr
735 sub %o0, 0x4, %o0
736 lda [%o0] ASI_CONTROL, %o1 ! sync error
737 add %o0, 0xc, %o0
738 lda [%o0] ASI_CONTROL, %o4 ! async vaddr
739 sub %o0, 0x4, %o0
740 lda [%o0] ASI_CONTROL, %o3 ! async error
741 call sparc_lvl15_nmi
742 add %sp, STACKFRAME_SZ, %o0
743
744 RESTORE_ALL
745
746 .align 4
747 .globl invalid_segment_patch1_ff
748 .globl invalid_segment_patch2_ff
749 invalid_segment_patch1_ff: cmp %l4, 0xff
750 invalid_segment_patch2_ff: mov 0xff, %l3
751
752 .align 4
753 .globl invalid_segment_patch1_1ff
754 .globl invalid_segment_patch2_1ff
755 invalid_segment_patch1_1ff: cmp %l4, 0x1ff
756 invalid_segment_patch2_1ff: mov 0x1ff, %l3
757
758 .align 4
759 .globl num_context_patch1_16, num_context_patch2_16
760 num_context_patch1_16: mov 0x10, %l7
761 num_context_patch2_16: mov 0x10, %l7
762
763 .align 4
764 .globl vac_linesize_patch_32
765 vac_linesize_patch_32: subcc %l7, 32, %l7
766
767 .align 4
768 .globl vac_hwflush_patch1_on, vac_hwflush_patch2_on
769
770 /*
771 * Ugly, but we cant use hardware flushing on the sun4 and we'd require
772 * two instructions (Anton)
773 */
774 vac_hwflush_patch1_on: addcc %l7, -PAGE_SIZE, %l7
775
776 vac_hwflush_patch2_on: sta %g0, [%l3 + %l7] ASI_HWFLUSHSEG
777
778 .globl invalid_segment_patch1, invalid_segment_patch2
779 .globl num_context_patch1
780 .globl vac_linesize_patch, vac_hwflush_patch1
781 .globl vac_hwflush_patch2
782
783 .align 4
784 .globl sun4c_fault
785
786 ! %l0 = %psr
787 ! %l1 = %pc
788 ! %l2 = %npc
789 ! %l3 = %wim
790 ! %l7 = 1 for textfault
791 ! We want error in %l5, vaddr in %l6
792 sun4c_fault:
793 sethi %hi(AC_SYNC_ERR), %l4
794 add %l4, 0x4, %l6 ! AC_SYNC_VA in %l6
795 lda [%l6] ASI_CONTROL, %l5 ! Address
796 lda [%l4] ASI_CONTROL, %l6 ! Error, retained for a bit
797
798 andn %l5, 0xfff, %l5 ! Encode all info into l7
799 srl %l6, 14, %l4
800
801 and %l4, 2, %l4
802 or %l5, %l4, %l4
803
804 or %l4, %l7, %l7 ! l7 = [addr,write,txtfault]
805
806 andcc %l0, PSR_PS, %g0
807 be sun4c_fault_fromuser
808 andcc %l7, 1, %g0 ! Text fault?
809
810 be 1f
811 sethi %hi(KERNBASE), %l4
812
813 mov %l1, %l5 ! PC
814
815 1:
816 cmp %l5, %l4
817 blu sun4c_fault_fromuser
818 sethi %hi(~((1 << SUN4C_REAL_PGDIR_SHIFT) - 1)), %l4
819
820 /* If the kernel references a bum kernel pointer, or a pte which
821 * points to a non existant page in ram, we will run this code
822 * _forever_ and lock up the machine!!!!! So we must check for
823 * this condition, the AC_SYNC_ERR bits are what we must examine.
824 * Also a parity error would make this happen as well. So we just
825 * check that we are in fact servicing a tlb miss and not some
826 * other type of fault for the kernel.
827 */
828 andcc %l6, 0x80, %g0
829 be sun4c_fault_fromuser
830 and %l5, %l4, %l5
831
832 /* Test for NULL pte_t * in vmalloc area. */
833 sethi %hi(VMALLOC_START), %l4
834 cmp %l5, %l4
835 blu,a invalid_segment_patch1
836 lduXa [%l5] ASI_SEGMAP, %l4
837
838 sethi %hi(swapper_pg_dir), %l4
839 srl %l5, SUN4C_PGDIR_SHIFT, %l6
840 or %l4, %lo(swapper_pg_dir), %l4
841 sll %l6, 2, %l6
842 ld [%l4 + %l6], %l4
843 andcc %l4, PAGE_MASK, %g0
844 be sun4c_fault_fromuser
845 lduXa [%l5] ASI_SEGMAP, %l4
846
847 invalid_segment_patch1:
848 cmp %l4, 0x7f
849 bne 1f
850 sethi %hi(sun4c_kfree_ring), %l4
851 or %l4, %lo(sun4c_kfree_ring), %l4
852 ld [%l4 + 0x18], %l3
853 deccc %l3 ! do we have a free entry?
854 bcs,a 2f ! no, unmap one.
855 sethi %hi(sun4c_kernel_ring), %l4
856
857 st %l3, [%l4 + 0x18] ! sun4c_kfree_ring.num_entries--
858
859 ld [%l4 + 0x00], %l6 ! entry = sun4c_kfree_ring.ringhd.next
860 st %l5, [%l6 + 0x08] ! entry->vaddr = address
861
862 ld [%l6 + 0x00], %l3 ! next = entry->next
863 ld [%l6 + 0x04], %l7 ! entry->prev
864
865 st %l7, [%l3 + 0x04] ! next->prev = entry->prev
866 st %l3, [%l7 + 0x00] ! entry->prev->next = next
867
868 sethi %hi(sun4c_kernel_ring), %l4
869 or %l4, %lo(sun4c_kernel_ring), %l4
870 ! head = &sun4c_kernel_ring.ringhd
871
872 ld [%l4 + 0x00], %l7 ! head->next
873
874 st %l4, [%l6 + 0x04] ! entry->prev = head
875 st %l7, [%l6 + 0x00] ! entry->next = head->next
876 st %l6, [%l7 + 0x04] ! head->next->prev = entry
877
878 st %l6, [%l4 + 0x00] ! head->next = entry
879
880 ld [%l4 + 0x18], %l3
881 inc %l3 ! sun4c_kernel_ring.num_entries++
882 st %l3, [%l4 + 0x18]
883 b 4f
884 ld [%l6 + 0x08], %l5
885
886 2:
887 or %l4, %lo(sun4c_kernel_ring), %l4
888 ! head = &sun4c_kernel_ring.ringhd
889
890 ld [%l4 + 0x04], %l6 ! entry = head->prev
891
892 ld [%l6 + 0x08], %l3 ! tmp = entry->vaddr
893
894 ! Flush segment from the cache.
895 sethi %hi((64 * 1024)), %l7
896 9:
897 vac_hwflush_patch1:
898 vac_linesize_patch:
899 subcc %l7, 16, %l7
900 bne 9b
901 vac_hwflush_patch2:
902 sta %g0, [%l3 + %l7] ASI_FLUSHSEG
903
904 st %l5, [%l6 + 0x08] ! entry->vaddr = address
905
906 ld [%l6 + 0x00], %l5 ! next = entry->next
907 ld [%l6 + 0x04], %l7 ! entry->prev
908
909 st %l7, [%l5 + 0x04] ! next->prev = entry->prev
910 st %l5, [%l7 + 0x00] ! entry->prev->next = next
911 st %l4, [%l6 + 0x04] ! entry->prev = head
912
913 ld [%l4 + 0x00], %l7 ! head->next
914
915 st %l7, [%l6 + 0x00] ! entry->next = head->next
916 st %l6, [%l7 + 0x04] ! head->next->prev = entry
917 st %l6, [%l4 + 0x00] ! head->next = entry
918
919 mov %l3, %l5 ! address = tmp
920
921 4:
922 num_context_patch1:
923 mov 0x08, %l7
924
925 ld [%l6 + 0x08], %l4
926 ldub [%l6 + 0x0c], %l3
927 or %l4, %l3, %l4 ! encode new vaddr/pseg into l4
928
929 sethi %hi(AC_CONTEXT), %l3
930 lduba [%l3] ASI_CONTROL, %l6
931
932 /* Invalidate old mapping, instantiate new mapping,
933 * for each context. Registers l6/l7 are live across
934 * this loop.
935 */
936 3: deccc %l7
937 sethi %hi(AC_CONTEXT), %l3
938 stba %l7, [%l3] ASI_CONTROL
939 invalid_segment_patch2:
940 mov 0x7f, %l3
941 stXa %l3, [%l5] ASI_SEGMAP
942 andn %l4, 0x1ff, %l3
943 bne 3b
944 stXa %l4, [%l3] ASI_SEGMAP
945
946 sethi %hi(AC_CONTEXT), %l3
947 stba %l6, [%l3] ASI_CONTROL
948
949 andn %l4, 0x1ff, %l5
950
951 1:
952 sethi %hi(VMALLOC_START), %l4
953 cmp %l5, %l4
954
955 bgeu 1f
956 mov 1 << (SUN4C_REAL_PGDIR_SHIFT - PAGE_SHIFT), %l7
957
958 sethi %hi(KERNBASE), %l6
959
960 sub %l5, %l6, %l4
961 srl %l4, PAGE_SHIFT, %l4
962 sethi %hi((SUN4C_PAGE_KERNEL & 0xf4000000)), %l3
963 or %l3, %l4, %l3
964
965 sethi %hi(PAGE_SIZE), %l4
966
967 2:
968 sta %l3, [%l5] ASI_PTE
969 deccc %l7
970 inc %l3
971 bne 2b
972 add %l5, %l4, %l5
973
974 b 7f
975 sethi %hi(sun4c_kernel_faults), %l4
976
977 1:
978 srl %l5, SUN4C_PGDIR_SHIFT, %l3
979 sethi %hi(swapper_pg_dir), %l4
980 or %l4, %lo(swapper_pg_dir), %l4
981 sll %l3, 2, %l3
982 ld [%l4 + %l3], %l4
983 and %l4, PAGE_MASK, %l4
984
985 srl %l5, (PAGE_SHIFT - 2), %l6
986 and %l6, ((SUN4C_PTRS_PER_PTE - 1) << 2), %l6
987 add %l6, %l4, %l6
988
989 sethi %hi(PAGE_SIZE), %l4
990
991 2:
992 ld [%l6], %l3
993 deccc %l7
994 sta %l3, [%l5] ASI_PTE
995 add %l6, 0x4, %l6
996 bne 2b
997 add %l5, %l4, %l5
998
999 sethi %hi(sun4c_kernel_faults), %l4
1000 7:
1001 ld [%l4 + %lo(sun4c_kernel_faults)], %l3
1002 inc %l3
1003 st %l3, [%l4 + %lo(sun4c_kernel_faults)]
1004
1005 /* Restore condition codes */
1006 wr %l0, 0x0, %psr
1007 WRITE_PAUSE
1008 jmp %l1
1009 rett %l2
1010
1011 sun4c_fault_fromuser:
1012 SAVE_ALL
1013 nop
1014
1015 mov %l7, %o1 ! Decode the info from %l7
1016 mov %l7, %o2
1017 and %o1, 1, %o1 ! arg2 = text_faultp
1018 mov %l7, %o3
1019 and %o2, 2, %o2 ! arg3 = writep
1020 andn %o3, 0xfff, %o3 ! arg4 = faulting address
1021
1022 wr %l0, PSR_ET, %psr
1023 WRITE_PAUSE
1024
1025 call do_sun4c_fault
1026 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
1027
1028 RESTORE_ALL
1029
1030 .align 4
1031 .globl srmmu_fault
1032 srmmu_fault:
1033 mov 0x400, %l5
1034 mov 0x300, %l4
1035
1036 lda [%l5] ASI_M_MMUREGS, %l6 ! read sfar first
1037 lda [%l4] ASI_M_MMUREGS, %l5 ! read sfsr last
1038
1039 andn %l6, 0xfff, %l6
1040 srl %l5, 6, %l5 ! and encode all info into l7
1041
1042 and %l5, 2, %l5
1043 or %l5, %l6, %l6
1044
1045 or %l6, %l7, %l7 ! l7 = [addr,write,txtfault]
1046
1047 SAVE_ALL
1048
1049 mov %l7, %o1
1050 mov %l7, %o2
1051 and %o1, 1, %o1 ! arg2 = text_faultp
1052 mov %l7, %o3
1053 and %o2, 2, %o2 ! arg3 = writep
1054 andn %o3, 0xfff, %o3 ! arg4 = faulting address
1055
1056 wr %l0, PSR_ET, %psr
1057 WRITE_PAUSE
1058
1059 call do_sparc_fault
1060 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
1061
1062 RESTORE_ALL
1063
1064 .align 4
1065 .globl sys_nis_syscall
1066 sys_nis_syscall:
1067 mov %o7, %l5
1068 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
1069 call c_sys_nis_syscall
1070 mov %l5, %o7
1071
1072 .align 4
1073 .globl sys_execve
1074 sys_execve:
1075 mov %o7, %l5
1076 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
1077 call sparc_execve
1078 mov %l5, %o7
1079
1080 .globl sunos_execv
1081 sunos_execv:
1082 st %g0, [%sp + STACKFRAME_SZ + PT_I2]
1083
1084 call sparc_execve
1085 add %sp, STACKFRAME_SZ, %o0
1086
1087 b ret_sys_call
1088 ld [%sp + STACKFRAME_SZ + PT_I0], %o0
1089
1090 .align 4
1091 .globl sys_pipe
1092 sys_pipe:
1093 mov %o7, %l5
1094 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
1095 call sparc_pipe
1096 mov %l5, %o7
1097
1098 .align 4
1099 .globl sys_sigaltstack
1100 sys_sigaltstack:
1101 mov %o7, %l5
1102 mov %fp, %o2
1103 call do_sigaltstack
1104 mov %l5, %o7
1105
1106 .align 4
1107 .globl sys_sigstack
1108 sys_sigstack:
1109 mov %o7, %l5
1110 mov %fp, %o2
1111 call do_sys_sigstack
1112 mov %l5, %o7
1113
1114 .align 4
1115 .globl sys_sigreturn
1116 sys_sigreturn:
1117 call do_sigreturn
1118 add %sp, STACKFRAME_SZ, %o0
1119
1120 ld [%curptr + TI_FLAGS], %l5
1121 andcc %l5, _TIF_SYSCALL_TRACE, %g0
1122 be 1f
1123 nop
1124
1125 call syscall_trace
1126 nop
1127
1128 1:
1129 /* We don't want to muck with user registers like a
1130 * normal syscall, just return.
1131 */
1132 RESTORE_ALL
1133
1134 .align 4
1135 .globl sys_rt_sigreturn
1136 sys_rt_sigreturn:
1137 call do_rt_sigreturn
1138 add %sp, STACKFRAME_SZ, %o0
1139
1140 ld [%curptr + TI_FLAGS], %l5
1141 andcc %l5, _TIF_SYSCALL_TRACE, %g0
1142 be 1f
1143 nop
1144
1145 add %sp, STACKFRAME_SZ, %o0
1146 call syscall_trace
1147 mov 1, %o1
1148
1149 1:
1150 /* We are returning to a signal handler. */
1151 RESTORE_ALL
1152
1153 /* Now that we have a real sys_clone, sys_fork() is
1154 * implemented in terms of it. Our _real_ implementation
1155 * of SunOS vfork() will use sys_vfork().
1156 *
1157 * XXX These three should be consolidated into mostly shared
1158 * XXX code just like on sparc64... -DaveM
1159 */
1160 .align 4
1161 .globl sys_fork, flush_patch_two
1162 sys_fork:
1163 mov %o7, %l5
1164 flush_patch_two:
1165 FLUSH_ALL_KERNEL_WINDOWS;
1166 ld [%curptr + TI_TASK], %o4
1167 rd %psr, %g4
1168 WRITE_PAUSE
1169 mov SIGCHLD, %o0 ! arg0: clone flags
1170 rd %wim, %g5
1171 WRITE_PAUSE
1172 mov %fp, %o1 ! arg1: usp
1173 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
1174 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
1175 mov 0, %o3
1176 call sparc_do_fork
1177 mov %l5, %o7
1178
1179 /* Whee, kernel threads! */
1180 .globl sys_clone, flush_patch_three
1181 sys_clone:
1182 mov %o7, %l5
1183 flush_patch_three:
1184 FLUSH_ALL_KERNEL_WINDOWS;
1185 ld [%curptr + TI_TASK], %o4
1186 rd %psr, %g4
1187 WRITE_PAUSE
1188
1189 /* arg0,1: flags,usp -- loaded already */
1190 cmp %o1, 0x0 ! Is new_usp NULL?
1191 rd %wim, %g5
1192 WRITE_PAUSE
1193 be,a 1f
1194 mov %fp, %o1 ! yes, use callers usp
1195 andn %o1, 7, %o1 ! no, align to 8 bytes
1196 1:
1197 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
1198 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
1199 mov 0, %o3
1200 call sparc_do_fork
1201 mov %l5, %o7
1202
1203 /* Whee, real vfork! */
1204 .globl sys_vfork, flush_patch_four
1205 sys_vfork:
1206 flush_patch_four:
1207 FLUSH_ALL_KERNEL_WINDOWS;
1208 ld [%curptr + TI_TASK], %o4
1209 rd %psr, %g4
1210 WRITE_PAUSE
1211 rd %wim, %g5
1212 WRITE_PAUSE
1213 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
1214 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
1215 mov %fp, %o1
1216 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
1217 sethi %hi(sparc_do_fork), %l1
1218 mov 0, %o3
1219 jmpl %l1 + %lo(sparc_do_fork), %g0
1220 add %sp, STACKFRAME_SZ, %o2
1221
1222 .align 4
1223 linux_sparc_ni_syscall:
1224 sethi %hi(sys_ni_syscall), %l7
1225 b syscall_is_too_hard
1226 or %l7, %lo(sys_ni_syscall), %l7
1227
1228 linux_fast_syscall:
1229 andn %l7, 3, %l7
1230 mov %i0, %o0
1231 mov %i1, %o1
1232 mov %i2, %o2
1233 jmpl %l7 + %g0, %g0
1234 mov %i3, %o3
1235
1236 linux_syscall_trace:
1237 add %sp, STACKFRAME_SZ, %o0
1238 call syscall_trace
1239 mov 0, %o1
1240 cmp %o0, 0
1241 bne 3f
1242 mov -ENOSYS, %o0
1243 mov %i0, %o0
1244 mov %i1, %o1
1245 mov %i2, %o2
1246 mov %i3, %o3
1247 b 2f
1248 mov %i4, %o4
1249
1250 .globl ret_from_fork
1251 ret_from_fork:
1252 call schedule_tail
1253 mov %g3, %o0
1254 b ret_sys_call
1255 ld [%sp + STACKFRAME_SZ + PT_I0], %o0
1256
1257 /* Linux native system calls enter here... */
1258 .align 4
1259 .globl linux_sparc_syscall
1260 linux_sparc_syscall:
1261 sethi %hi(PSR_SYSCALL), %l4
1262 or %l0, %l4, %l0
1263 /* Direct access to user regs, must faster. */
1264 cmp %g1, NR_SYSCALLS
1265 bgeu linux_sparc_ni_syscall
1266 sll %g1, 2, %l4
1267 ld [%l7 + %l4], %l7
1268 andcc %l7, 1, %g0
1269 bne linux_fast_syscall
1270 /* Just do first insn from SAVE_ALL in the delay slot */
1271
1272 syscall_is_too_hard:
1273 SAVE_ALL_HEAD
1274 rd %wim, %l3
1275
1276 wr %l0, PSR_ET, %psr
1277 mov %i0, %o0
1278 mov %i1, %o1
1279 mov %i2, %o2
1280
1281 ld [%curptr + TI_FLAGS], %l5
1282 mov %i3, %o3
1283 andcc %l5, _TIF_SYSCALL_TRACE, %g0
1284 mov %i4, %o4
1285 bne linux_syscall_trace
1286 mov %i0, %l5
1287 2:
1288 call %l7
1289 mov %i5, %o5
1290
1291 3:
1292 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1293
1294 ret_sys_call:
1295 ld [%curptr + TI_FLAGS], %l6
1296 cmp %o0, -ERESTART_RESTARTBLOCK
1297 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
1298 set PSR_C, %g2
1299 bgeu 1f
1300 andcc %l6, _TIF_SYSCALL_TRACE, %g0
1301
1302 /* System call success, clear Carry condition code. */
1303 andn %g3, %g2, %g3
1304 clr %l6
1305 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1306 bne linux_syscall_trace2
1307 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1308 add %l1, 0x4, %l2 /* npc = npc+4 */
1309 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1310 b ret_trap_entry
1311 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1312 1:
1313 /* System call failure, set Carry condition code.
1314 * Also, get abs(errno) to return to the process.
1315 */
1316 sub %g0, %o0, %o0
1317 or %g3, %g2, %g3
1318 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1319 mov 1, %l6
1320 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1321 bne linux_syscall_trace2
1322 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1323 add %l1, 0x4, %l2 /* npc = npc+4 */
1324 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1325 b ret_trap_entry
1326 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1327
1328 linux_syscall_trace2:
1329 add %sp, STACKFRAME_SZ, %o0
1330 mov 1, %o1
1331 call syscall_trace
1332 add %l1, 0x4, %l2 /* npc = npc+4 */
1333 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1334 b ret_trap_entry
1335 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1336
1337
1338 /* Saving and restoring the FPU state is best done from lowlevel code.
1339 *
1340 * void fpsave(unsigned long *fpregs, unsigned long *fsr,
1341 * void *fpqueue, unsigned long *fpqdepth)
1342 */
1343
1344 .globl fpsave
1345 fpsave:
1346 st %fsr, [%o1] ! this can trap on us if fpu is in bogon state
1347 ld [%o1], %g1
1348 set 0x2000, %g4
1349 andcc %g1, %g4, %g0
1350 be 2f
1351 mov 0, %g2
1352
1353 /* We have an fpqueue to save. */
1354 1:
1355 std %fq, [%o2]
1356 fpsave_magic:
1357 st %fsr, [%o1]
1358 ld [%o1], %g3
1359 andcc %g3, %g4, %g0
1360 add %g2, 1, %g2
1361 bne 1b
1362 add %o2, 8, %o2
1363
1364 2:
1365 st %g2, [%o3]
1366
1367 std %f0, [%o0 + 0x00]
1368 std %f2, [%o0 + 0x08]
1369 std %f4, [%o0 + 0x10]
1370 std %f6, [%o0 + 0x18]
1371 std %f8, [%o0 + 0x20]
1372 std %f10, [%o0 + 0x28]
1373 std %f12, [%o0 + 0x30]
1374 std %f14, [%o0 + 0x38]
1375 std %f16, [%o0 + 0x40]
1376 std %f18, [%o0 + 0x48]
1377 std %f20, [%o0 + 0x50]
1378 std %f22, [%o0 + 0x58]
1379 std %f24, [%o0 + 0x60]
1380 std %f26, [%o0 + 0x68]
1381 std %f28, [%o0 + 0x70]
1382 retl
1383 std %f30, [%o0 + 0x78]
1384
1385 /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
1386 * code for pointing out this possible deadlock, while we save state
1387 * above we could trap on the fsr store so our low level fpu trap
1388 * code has to know how to deal with this.
1389 */
1390 fpsave_catch:
1391 b fpsave_magic + 4
1392 st %fsr, [%o1]
1393
1394 fpsave_catch2:
1395 b fpsave + 4
1396 st %fsr, [%o1]
1397
1398 /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
1399
1400 .globl fpload
1401 fpload:
1402 ldd [%o0 + 0x00], %f0
1403 ldd [%o0 + 0x08], %f2
1404 ldd [%o0 + 0x10], %f4
1405 ldd [%o0 + 0x18], %f6
1406 ldd [%o0 + 0x20], %f8
1407 ldd [%o0 + 0x28], %f10
1408 ldd [%o0 + 0x30], %f12
1409 ldd [%o0 + 0x38], %f14
1410 ldd [%o0 + 0x40], %f16
1411 ldd [%o0 + 0x48], %f18
1412 ldd [%o0 + 0x50], %f20
1413 ldd [%o0 + 0x58], %f22
1414 ldd [%o0 + 0x60], %f24
1415 ldd [%o0 + 0x68], %f26
1416 ldd [%o0 + 0x70], %f28
1417 ldd [%o0 + 0x78], %f30
1418 ld [%o1], %fsr
1419 retl
1420 nop
1421
1422 /* __ndelay and __udelay take two arguments:
1423 * 0 - nsecs or usecs to delay
1424 * 1 - per_cpu udelay_val (loops per jiffy)
1425 *
1426 * Note that ndelay gives HZ times higher resolution but has a 10ms
1427 * limit. udelay can handle up to 1s.
1428 */
1429 .globl __ndelay
1430 __ndelay:
1431 save %sp, -STACKFRAME_SZ, %sp
1432 mov %i0, %o0
1433 call .umul ! round multiplier up so large ns ok
1434 mov 0x1ae, %o1 ! 2**32 / (1 000 000 000 / HZ)
1435 call .umul
1436 mov %i1, %o1 ! udelay_val
1437 ba delay_continue
1438 mov %o1, %o0 ! >>32 later for better resolution
1439
1440 .globl __udelay
1441 __udelay:
1442 save %sp, -STACKFRAME_SZ, %sp
1443 mov %i0, %o0
1444 sethi %hi(0x10c7), %o1 ! round multiplier up so large us ok
1445 call .umul
1446 or %o1, %lo(0x10c7), %o1 ! 2**32 / 1 000 000
1447 call .umul
1448 mov %i1, %o1 ! udelay_val
1449 sethi %hi(0x028f4b62), %l0 ! Add in rounding constant * 2**32,
1450 or %g0, %lo(0x028f4b62), %l0
1451 addcc %o0, %l0, %o0 ! 2**32 * 0.009 999
1452 bcs,a 3f
1453 add %o1, 0x01, %o1
1454 3:
1455 call .umul
1456 mov HZ, %o0 ! >>32 earlier for wider range
1457
1458 delay_continue:
1459 cmp %o0, 0x0
1460 1:
1461 bne 1b
1462 subcc %o0, 1, %o0
1463
1464 ret
1465 restore
1466
1467 /* Handle a software breakpoint */
1468 /* We have to inform parent that child has stopped */
1469 .align 4
1470 .globl breakpoint_trap
1471 breakpoint_trap:
1472 rd %wim,%l3
1473 SAVE_ALL
1474 wr %l0, PSR_ET, %psr
1475 WRITE_PAUSE
1476
1477 st %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
1478 call sparc_breakpoint
1479 add %sp, STACKFRAME_SZ, %o0
1480
1481 RESTORE_ALL
1482
1483 #ifdef CONFIG_KGDB
1484 .align 4
1485 .globl kgdb_trap_low
1486 .type kgdb_trap_low,#function
1487 kgdb_trap_low:
1488 rd %wim,%l3
1489 SAVE_ALL
1490 wr %l0, PSR_ET, %psr
1491 WRITE_PAUSE
1492
1493 call kgdb_trap
1494 add %sp, STACKFRAME_SZ, %o0
1495
1496 RESTORE_ALL
1497 .size kgdb_trap_low,.-kgdb_trap_low
1498 #endif
1499
1500 .align 4
1501 .globl flush_patch_exception
1502 flush_patch_exception:
1503 FLUSH_ALL_KERNEL_WINDOWS;
1504 ldd [%o0], %o6
1505 jmpl %o7 + 0xc, %g0 ! see asm-sparc/processor.h
1506 mov 1, %g1 ! signal EFAULT condition
1507
1508 .align 4
1509 .globl kill_user_windows, kuw_patch1_7win
1510 .globl kuw_patch1
1511 kuw_patch1_7win: sll %o3, 6, %o3
1512
1513 /* No matter how much overhead this routine has in the worst
1514 * case scenerio, it is several times better than taking the
1515 * traps with the old method of just doing flush_user_windows().
1516 */
1517 kill_user_windows:
1518 ld [%g6 + TI_UWINMASK], %o0 ! get current umask
1519 orcc %g0, %o0, %g0 ! if no bits set, we are done
1520 be 3f ! nothing to do
1521 rd %psr, %o5 ! must clear interrupts
1522 or %o5, PSR_PIL, %o4 ! or else that could change
1523 wr %o4, 0x0, %psr ! the uwinmask state
1524 WRITE_PAUSE ! burn them cycles
1525 1:
1526 ld [%g6 + TI_UWINMASK], %o0 ! get consistent state
1527 orcc %g0, %o0, %g0 ! did an interrupt come in?
1528 be 4f ! yep, we are done
1529 rd %wim, %o3 ! get current wim
1530 srl %o3, 1, %o4 ! simulate a save
1531 kuw_patch1:
1532 sll %o3, 7, %o3 ! compute next wim
1533 or %o4, %o3, %o3 ! result
1534 andncc %o0, %o3, %o0 ! clean this bit in umask
1535 bne kuw_patch1 ! not done yet
1536 srl %o3, 1, %o4 ! begin another save simulation
1537 wr %o3, 0x0, %wim ! set the new wim
1538 st %g0, [%g6 + TI_UWINMASK] ! clear uwinmask
1539 4:
1540 wr %o5, 0x0, %psr ! re-enable interrupts
1541 WRITE_PAUSE ! burn baby burn
1542 3:
1543 retl ! return
1544 st %g0, [%g6 + TI_W_SAVED] ! no windows saved
1545
1546 .align 4
1547 .globl restore_current
1548 restore_current:
1549 LOAD_CURRENT(g6, o0)
1550 retl
1551 nop
1552
1553 #ifdef CONFIG_PCI
1554 #include <asm/pcic.h>
1555
1556 .align 4
1557 .globl linux_trap_ipi15_pcic
1558 linux_trap_ipi15_pcic:
1559 rd %wim, %l3
1560 SAVE_ALL
1561
1562 /*
1563 * First deactivate NMI
1564 * or we cannot drop ET, cannot get window spill traps.
1565 * The busy loop is necessary because the PIO error
1566 * sometimes does not go away quickly and we trap again.
1567 */
1568 sethi %hi(pcic_regs), %o1
1569 ld [%o1 + %lo(pcic_regs)], %o2
1570
1571 ! Get pending status for printouts later.
1572 ld [%o2 + PCI_SYS_INT_PENDING], %o0
1573
1574 mov PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
1575 stb %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
1576 1:
1577 ld [%o2 + PCI_SYS_INT_PENDING], %o1
1578 andcc %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
1579 bne 1b
1580 nop
1581
1582 or %l0, PSR_PIL, %l4
1583 wr %l4, 0x0, %psr
1584 WRITE_PAUSE
1585 wr %l4, PSR_ET, %psr
1586 WRITE_PAUSE
1587
1588 call pcic_nmi
1589 add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
1590 RESTORE_ALL
1591
1592 .globl pcic_nmi_trap_patch
1593 pcic_nmi_trap_patch:
1594 sethi %hi(linux_trap_ipi15_pcic), %l3
1595 jmpl %l3 + %lo(linux_trap_ipi15_pcic), %g0
1596 rd %psr, %l0
1597 .word 0
1598
1599 #endif /* CONFIG_PCI */
1600
1601 .globl flushw_all
1602 flushw_all:
1603 save %sp, -0x40, %sp
1604 save %sp, -0x40, %sp
1605 save %sp, -0x40, %sp
1606 save %sp, -0x40, %sp
1607 save %sp, -0x40, %sp
1608 save %sp, -0x40, %sp
1609 save %sp, -0x40, %sp
1610 restore
1611 restore
1612 restore
1613 restore
1614 restore
1615 restore
1616 ret
1617 restore
1618
1619 /* End of entry.S */
Linux kernel - Deliverables
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