| blob | 88d2cefd01bee1bc25d9f8ae85413bd80dc38a17 |
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 */
10 #include <linux/errno.h>
12 #include <asm/head.h>
13 #include <asm/asi.h>
14 #include <asm/smp.h>
15 #include <asm/kgdb.h>
16 #include <asm/contregs.h>
17 #include <asm/ptrace.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/psr.h>
20 #include <asm/vaddrs.h>
21 #include <asm/memreg.h>
22 #include <asm/page.h>
23 #ifdef CONFIG_SUN4
24 #include <asm/pgtsun4.h>
25 #else
26 #include <asm/pgtsun4c.h>
27 #endif
28 #include <asm/winmacro.h>
29 #include <asm/signal.h>
30 #include <asm/obio.h>
31 #include <asm/mxcc.h>
32 #include <asm/thread_info.h>
33 #include <asm/param.h>
34 #include <asm/unistd.h>
36 #include <asm/asmmacro.h>
38 #define curptr g6
40 /* These are just handy. */
41 #define _SV save %sp, -STACKFRAME_SZ, %sp
42 #define _RS restore
44 #define FLUSH_ALL_KERNEL_WINDOWS \
45 _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
46 _RS; _RS; _RS; _RS; _RS; _RS; _RS;
48 /* First, KGDB low level things. This is a rewrite
49 * of the routines found in the sparc-stub.c asm() statement
50 * from the gdb distribution. This is also dual-purpose
51 * as a software trap for userlevel programs.
52 */
53 .data
54 .align 4
56 in_trap_handler:
57 .word 0
59 .text
60 .align 4
62 #if 0 /* kgdb is dropped from 2.5.33 */
63 ! This function is called when any SPARC trap (except window overflow or
64 ! underflow) occurs. It makes sure that the invalid register window is still
65 ! available before jumping into C code. It will also restore the world if you
66 ! return from handle_exception.
68 .globl trap_low
69 trap_low:
70 rd %wim, %l3
71 SAVE_ALL
73 sethi %hi(in_trap_handler), %l4
74 ld [%lo(in_trap_handler) + %l4], %l5
75 inc %l5
76 st %l5, [%lo(in_trap_handler) + %l4]
78 /* Make sure kgdb sees the same state we just saved. */
79 LOAD_PT_GLOBALS(sp)
80 LOAD_PT_INS(sp)
81 ld [%sp + STACKFRAME_SZ + PT_Y], %l4
82 ld [%sp + STACKFRAME_SZ + PT_WIM], %l3
83 ld [%sp + STACKFRAME_SZ + PT_PSR], %l0
84 ld [%sp + STACKFRAME_SZ + PT_PC], %l1
85 ld [%sp + STACKFRAME_SZ + PT_NPC], %l2
86 rd %tbr, %l5 /* Never changes... */
88 /* Make kgdb exception frame. */
89 sub %sp,(16+1+6+1+72)*4,%sp ! Make room for input & locals
90 ! + hidden arg + arg spill
91 ! + doubleword alignment
92 ! + registers[72] local var
93 SAVE_KGDB_GLOBALS(sp)
94 SAVE_KGDB_INS(sp)
95 SAVE_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
97 /* We are increasing PIL, so two writes. */
98 or %l0, PSR_PIL, %l0
99 wr %l0, 0, %psr
100 WRITE_PAUSE
101 wr %l0, PSR_ET, %psr
102 WRITE_PAUSE
104 call handle_exception
105 add %sp, STACKFRAME_SZ, %o0 ! Pass address of registers
107 /* Load new kgdb register set. */
108 LOAD_KGDB_GLOBALS(sp)
109 LOAD_KGDB_INS(sp)
110 LOAD_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
111 wr %l4, 0x0, %y
113 sethi %hi(in_trap_handler), %l4
114 ld [%lo(in_trap_handler) + %l4], %l5
115 dec %l5
116 st %l5, [%lo(in_trap_handler) + %l4]
118 add %sp,(16+1+6+1+72)*4,%sp ! Undo the kgdb trap frame.
120 /* Now take what kgdb did and place it into the pt_regs
121 * frame which SparcLinux RESTORE_ALL understands.,
122 */
123 STORE_PT_INS(sp)
124 STORE_PT_GLOBALS(sp)
125 STORE_PT_YREG(sp, g2)
126 STORE_PT_PRIV(sp, l0, l1, l2)
128 RESTORE_ALL
129 #endif
131 #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
132 .text
133 .align 4
134 .globl floppy_hardint
135 floppy_hardint:
136 /*
137 * This code cannot touch registers %l0 %l1 and %l2
138 * because SAVE_ALL depends on their values. It depends
139 * on %l3 also, but we regenerate it before a call.
140 * Other registers are:
141 * %l3 -- base address of fdc registers
142 * %l4 -- pdma_vaddr
143 * %l5 -- scratch for ld/st address
144 * %l6 -- pdma_size
145 * %l7 -- scratch [floppy byte, ld/st address, aux. data]
146 */
148 /* Do we have work to do? */
149 sethi %hi(doing_pdma), %l7
150 ld [%l7 + %lo(doing_pdma)], %l7
151 cmp %l7, 0
152 be floppy_dosoftint
153 nop
155 /* Load fdc register base */
156 sethi %hi(fdc_status), %l3
157 ld [%l3 + %lo(fdc_status)], %l3
159 /* Setup register addresses */
160 sethi %hi(pdma_vaddr), %l5 ! transfer buffer
161 ld [%l5 + %lo(pdma_vaddr)], %l4
162 sethi %hi(pdma_size), %l5 ! bytes to go
163 ld [%l5 + %lo(pdma_size)], %l6
164 next_byte:
165 ldub [%l3], %l7
167 andcc %l7, 0x80, %g0 ! Does fifo still have data
168 bz floppy_fifo_emptied ! fifo has been emptied...
169 andcc %l7, 0x20, %g0 ! in non-dma mode still?
170 bz floppy_overrun ! nope, overrun
171 andcc %l7, 0x40, %g0 ! 0=write 1=read
172 bz floppy_write
173 sub %l6, 0x1, %l6
175 /* Ok, actually read this byte */
176 ldub [%l3 + 1], %l7
177 orcc %g0, %l6, %g0
178 stb %l7, [%l4]
179 bne next_byte
180 add %l4, 0x1, %l4
182 b floppy_tdone
183 nop
185 floppy_write:
186 /* Ok, actually write this byte */
187 ldub [%l4], %l7
188 orcc %g0, %l6, %g0
189 stb %l7, [%l3 + 1]
190 bne next_byte
191 add %l4, 0x1, %l4
193 /* fall through... */
194 floppy_tdone:
195 sethi %hi(pdma_vaddr), %l5
196 st %l4, [%l5 + %lo(pdma_vaddr)]
197 sethi %hi(pdma_size), %l5
198 st %l6, [%l5 + %lo(pdma_size)]
199 /* Flip terminal count pin */
200 set auxio_register, %l7
201 ld [%l7], %l7
203 set sparc_cpu_model, %l5
204 ld [%l5], %l5
205 subcc %l5, 1, %g0 /* enum { sun4c = 1 }; */
206 be 1f
207 ldub [%l7], %l5
209 or %l5, 0xc2, %l5
210 stb %l5, [%l7]
211 andn %l5, 0x02, %l5
212 b 2f
213 nop
215 1:
216 or %l5, 0xf4, %l5
217 stb %l5, [%l7]
218 andn %l5, 0x04, %l5
220 2:
221 /* Kill some time so the bits set */
222 WRITE_PAUSE
223 WRITE_PAUSE
225 stb %l5, [%l7]
227 /* Prevent recursion */
228 sethi %hi(doing_pdma), %l7
229 b floppy_dosoftint
230 st %g0, [%l7 + %lo(doing_pdma)]
232 /* We emptied the FIFO, but we haven't read everything
233 * as of yet. Store the current transfer address and
234 * bytes left to read so we can continue when the next
235 * fast IRQ comes in.
236 */
237 floppy_fifo_emptied:
238 sethi %hi(pdma_vaddr), %l5
239 st %l4, [%l5 + %lo(pdma_vaddr)]
240 sethi %hi(pdma_size), %l7
241 st %l6, [%l7 + %lo(pdma_size)]
243 /* Restore condition codes */
244 wr %l0, 0x0, %psr
245 WRITE_PAUSE
247 jmp %l1
248 rett %l2
250 floppy_overrun:
251 sethi %hi(pdma_vaddr), %l5
252 st %l4, [%l5 + %lo(pdma_vaddr)]
253 sethi %hi(pdma_size), %l5
254 st %l6, [%l5 + %lo(pdma_size)]
255 /* Prevent recursion */
256 sethi %hi(doing_pdma), %l7
257 st %g0, [%l7 + %lo(doing_pdma)]
259 /* fall through... */
260 floppy_dosoftint:
261 rd %wim, %l3
262 SAVE_ALL
264 /* Set all IRQs off. */
265 or %l0, PSR_PIL, %l4
266 wr %l4, 0x0, %psr
267 WRITE_PAUSE
268 wr %l4, PSR_ET, %psr
269 WRITE_PAUSE
271 mov 11, %o0 ! floppy irq level (unused anyway)
272 mov %g0, %o1 ! devid is not used in fast interrupts
273 call sparc_floppy_irq
274 add %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
276 RESTORE_ALL
278 #endif /* (CONFIG_BLK_DEV_FD) */
280 /* Bad trap handler */
281 .globl bad_trap_handler
282 bad_trap_handler:
283 SAVE_ALL
285 wr %l0, PSR_ET, %psr
286 WRITE_PAUSE
288 add %sp, STACKFRAME_SZ, %o0 ! pt_regs
289 call do_hw_interrupt
290 mov %l7, %o1 ! trap number
292 RESTORE_ALL
294 /* For now all IRQ's not registered get sent here. handler_irq() will
295 * see if a routine is registered to handle this interrupt and if not
296 * it will say so on the console.
297 */
299 .align 4
300 .globl real_irq_entry, patch_handler_irq
301 real_irq_entry:
302 SAVE_ALL
304 #ifdef CONFIG_SMP
305 .globl patchme_maybe_smp_msg
307 cmp %l7, 12
308 patchme_maybe_smp_msg:
309 bgu maybe_smp4m_msg
310 nop
311 #endif
313 real_irq_continue:
314 or %l0, PSR_PIL, %g2
315 wr %g2, 0x0, %psr
316 WRITE_PAUSE
317 wr %g2, PSR_ET, %psr
318 WRITE_PAUSE
319 mov %l7, %o0 ! irq level
320 patch_handler_irq:
321 call handler_irq
322 add %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
323 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
324 wr %g2, PSR_ET, %psr ! keep ET up
325 WRITE_PAUSE
327 RESTORE_ALL
329 #ifdef CONFIG_SMP
330 /* SMP per-cpu ticker interrupts are handled specially. */
331 smp4m_ticker:
332 bne real_irq_continue+4
333 or %l0, PSR_PIL, %g2
334 wr %g2, 0x0, %psr
335 WRITE_PAUSE
336 wr %g2, PSR_ET, %psr
337 WRITE_PAUSE
338 call smp4m_percpu_timer_interrupt
339 add %sp, STACKFRAME_SZ, %o0
340 wr %l0, PSR_ET, %psr
341 WRITE_PAUSE
342 RESTORE_ALL
344 /* Here is where we check for possible SMP IPI passed to us
345 * on some level other than 15 which is the NMI and only used
346 * for cross calls. That has a separate entry point below.
347 */
348 maybe_smp4m_msg:
349 GET_PROCESSOR4M_ID(o3)
350 set sun4m_interrupts, %l5
351 ld [%l5], %o5
352 sethi %hi(0x40000000), %o2
353 sll %o3, 12, %o3
354 ld [%o5 + %o3], %o1
355 andcc %o1, %o2, %g0
356 be,a smp4m_ticker
357 cmp %l7, 14
358 st %o2, [%o5 + 0x4]
359 WRITE_PAUSE
360 ld [%o5], %g0
361 WRITE_PAUSE
362 or %l0, PSR_PIL, %l4
363 wr %l4, 0x0, %psr
364 WRITE_PAUSE
365 wr %l4, PSR_ET, %psr
366 WRITE_PAUSE
367 call smp_reschedule_irq
368 nop
370 RESTORE_ALL
372 .align 4
373 .globl linux_trap_ipi15_sun4m
374 linux_trap_ipi15_sun4m:
375 SAVE_ALL
376 sethi %hi(0x80000000), %o2
377 GET_PROCESSOR4M_ID(o0)
378 set sun4m_interrupts, %l5
379 ld [%l5], %o5
380 sll %o0, 12, %o0
381 add %o5, %o0, %o5
382 ld [%o5], %o3
383 andcc %o3, %o2, %g0
384 be 1f ! Must be an NMI async memory error
385 st %o2, [%o5 + 4]
386 WRITE_PAUSE
387 ld [%o5], %g0
388 WRITE_PAUSE
389 or %l0, PSR_PIL, %l4
390 wr %l4, 0x0, %psr
391 WRITE_PAUSE
392 wr %l4, PSR_ET, %psr
393 WRITE_PAUSE
394 call smp4m_cross_call_irq
395 nop
396 b ret_trap_lockless_ipi
397 clr %l6
398 1:
399 /* NMI async memory error handling. */
400 sethi %hi(0x80000000), %l4
401 sethi %hi(0x4000), %o3
402 sub %o5, %o0, %o5
403 add %o5, %o3, %l5
404 st %l4, [%l5 + 0xc]
405 WRITE_PAUSE
406 ld [%l5], %g0
407 WRITE_PAUSE
408 or %l0, PSR_PIL, %l4
409 wr %l4, 0x0, %psr
410 WRITE_PAUSE
411 wr %l4, PSR_ET, %psr
412 WRITE_PAUSE
413 call sun4m_nmi
414 nop
415 st %l4, [%l5 + 0x8]
416 WRITE_PAUSE
417 ld [%l5], %g0
418 WRITE_PAUSE
419 RESTORE_ALL
421 .globl smp4d_ticker
422 /* SMP per-cpu ticker interrupts are handled specially. */
423 smp4d_ticker:
424 SAVE_ALL
425 or %l0, PSR_PIL, %g2
426 sethi %hi(CC_ICLR), %o0
427 sethi %hi(1 << 14), %o1
428 or %o0, %lo(CC_ICLR), %o0
429 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
430 wr %g2, 0x0, %psr
431 WRITE_PAUSE
432 wr %g2, PSR_ET, %psr
433 WRITE_PAUSE
434 call smp4d_percpu_timer_interrupt
435 add %sp, STACKFRAME_SZ, %o0
436 wr %l0, PSR_ET, %psr
437 WRITE_PAUSE
438 RESTORE_ALL
440 .align 4
441 .globl linux_trap_ipi15_sun4d
442 linux_trap_ipi15_sun4d:
443 SAVE_ALL
444 sethi %hi(CC_BASE), %o4
445 sethi %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
446 or %o4, (CC_EREG - CC_BASE), %o0
447 ldda [%o0] ASI_M_MXCC, %o0
448 andcc %o0, %o2, %g0
449 bne 1f
450 sethi %hi(BB_STAT2), %o2
451 lduba [%o2] ASI_M_CTL, %o2
452 andcc %o2, BB_STAT2_MASK, %g0
453 bne 2f
454 or %o4, (CC_ICLR - CC_BASE), %o0
455 sethi %hi(1 << 15), %o1
456 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 15 in MXCC's ICLR */
457 or %l0, PSR_PIL, %l4
458 wr %l4, 0x0, %psr
459 WRITE_PAUSE
460 wr %l4, PSR_ET, %psr
461 WRITE_PAUSE
462 call smp4d_cross_call_irq
463 nop
464 b ret_trap_lockless_ipi
465 clr %l6
467 1: /* MXCC error */
468 2: /* BB error */
469 /* Disable PIL 15 */
470 set CC_IMSK, %l4
471 lduha [%l4] ASI_M_MXCC, %l5
472 sethi %hi(1 << 15), %l7
473 or %l5, %l7, %l5
474 stha %l5, [%l4] ASI_M_MXCC
475 /* FIXME */
476 1: b,a 1b
478 #endif /* CONFIG_SMP */
480 /* This routine handles illegal instructions and privileged
481 * instruction attempts from user code.
482 */
483 .align 4
484 .globl bad_instruction
485 bad_instruction:
486 sethi %hi(0xc1f80000), %l4
487 ld [%l1], %l5
488 sethi %hi(0x81d80000), %l7
489 and %l5, %l4, %l5
490 cmp %l5, %l7
491 be 1f
492 SAVE_ALL
494 wr %l0, PSR_ET, %psr ! re-enable traps
495 WRITE_PAUSE
497 add %sp, STACKFRAME_SZ, %o0
498 mov %l1, %o1
499 mov %l2, %o2
500 call do_illegal_instruction
501 mov %l0, %o3
503 RESTORE_ALL
505 1: /* unimplemented flush - just skip */
506 jmpl %l2, %g0
507 rett %l2 + 4
509 .align 4
510 .globl priv_instruction
511 priv_instruction:
512 SAVE_ALL
514 wr %l0, PSR_ET, %psr
515 WRITE_PAUSE
517 add %sp, STACKFRAME_SZ, %o0
518 mov %l1, %o1
519 mov %l2, %o2
520 call do_priv_instruction
521 mov %l0, %o3
523 RESTORE_ALL
525 /* This routine handles unaligned data accesses. */
526 .align 4
527 .globl mna_handler
528 mna_handler:
529 andcc %l0, PSR_PS, %g0
530 be mna_fromuser
531 nop
533 SAVE_ALL
535 wr %l0, PSR_ET, %psr
536 WRITE_PAUSE
538 ld [%l1], %o1
539 call kernel_unaligned_trap
540 add %sp, STACKFRAME_SZ, %o0
542 RESTORE_ALL
544 mna_fromuser:
545 SAVE_ALL
547 wr %l0, PSR_ET, %psr ! re-enable traps
548 WRITE_PAUSE
550 ld [%l1], %o1
551 call user_unaligned_trap
552 add %sp, STACKFRAME_SZ, %o0
554 RESTORE_ALL
556 /* This routine handles floating point disabled traps. */
557 .align 4
558 .globl fpd_trap_handler
559 fpd_trap_handler:
560 SAVE_ALL
562 wr %l0, PSR_ET, %psr ! re-enable traps
563 WRITE_PAUSE
565 add %sp, STACKFRAME_SZ, %o0
566 mov %l1, %o1
567 mov %l2, %o2
568 call do_fpd_trap
569 mov %l0, %o3
571 RESTORE_ALL
573 /* This routine handles Floating Point Exceptions. */
574 .align 4
575 .globl fpe_trap_handler
576 fpe_trap_handler:
577 set fpsave_magic, %l5
578 cmp %l1, %l5
579 be 1f
580 sethi %hi(fpsave), %l5
581 or %l5, %lo(fpsave), %l5
582 cmp %l1, %l5
583 bne 2f
584 sethi %hi(fpsave_catch2), %l5
585 or %l5, %lo(fpsave_catch2), %l5
586 wr %l0, 0x0, %psr
587 WRITE_PAUSE
588 jmp %l5
589 rett %l5 + 4
590 1:
591 sethi %hi(fpsave_catch), %l5
592 or %l5, %lo(fpsave_catch), %l5
593 wr %l0, 0x0, %psr
594 WRITE_PAUSE
595 jmp %l5
596 rett %l5 + 4
598 2:
599 SAVE_ALL
601 wr %l0, PSR_ET, %psr ! re-enable traps
602 WRITE_PAUSE
604 add %sp, STACKFRAME_SZ, %o0
605 mov %l1, %o1
606 mov %l2, %o2
607 call do_fpe_trap
608 mov %l0, %o3
610 RESTORE_ALL
612 /* This routine handles Tag Overflow Exceptions. */
613 .align 4
614 .globl do_tag_overflow
615 do_tag_overflow:
616 SAVE_ALL
618 wr %l0, PSR_ET, %psr ! re-enable traps
619 WRITE_PAUSE
621 add %sp, STACKFRAME_SZ, %o0
622 mov %l1, %o1
623 mov %l2, %o2
624 call handle_tag_overflow
625 mov %l0, %o3
627 RESTORE_ALL
629 /* This routine handles Watchpoint Exceptions. */
630 .align 4
631 .globl do_watchpoint
632 do_watchpoint:
633 SAVE_ALL
635 wr %l0, PSR_ET, %psr ! re-enable traps
636 WRITE_PAUSE
638 add %sp, STACKFRAME_SZ, %o0
639 mov %l1, %o1
640 mov %l2, %o2
641 call handle_watchpoint
642 mov %l0, %o3
644 RESTORE_ALL
646 /* This routine handles Register Access Exceptions. */
647 .align 4
648 .globl do_reg_access
649 do_reg_access:
650 SAVE_ALL
652 wr %l0, PSR_ET, %psr ! re-enable traps
653 WRITE_PAUSE
655 add %sp, STACKFRAME_SZ, %o0
656 mov %l1, %o1
657 mov %l2, %o2
658 call handle_reg_access
659 mov %l0, %o3
661 RESTORE_ALL
663 /* This routine handles Co-Processor Disabled Exceptions. */
664 .align 4
665 .globl do_cp_disabled
666 do_cp_disabled:
667 SAVE_ALL
669 wr %l0, PSR_ET, %psr ! re-enable traps
670 WRITE_PAUSE
672 add %sp, STACKFRAME_SZ, %o0
673 mov %l1, %o1
674 mov %l2, %o2
675 call handle_cp_disabled
676 mov %l0, %o3
678 RESTORE_ALL
680 /* This routine handles Co-Processor Exceptions. */
681 .align 4
682 .globl do_cp_exception
683 do_cp_exception:
684 SAVE_ALL
686 wr %l0, PSR_ET, %psr ! re-enable traps
687 WRITE_PAUSE
689 add %sp, STACKFRAME_SZ, %o0
690 mov %l1, %o1
691 mov %l2, %o2
692 call handle_cp_exception
693 mov %l0, %o3
695 RESTORE_ALL
697 /* This routine handles Hardware Divide By Zero Exceptions. */
698 .align 4
699 .globl do_hw_divzero
700 do_hw_divzero:
701 SAVE_ALL
703 wr %l0, PSR_ET, %psr ! re-enable traps
704 WRITE_PAUSE
706 add %sp, STACKFRAME_SZ, %o0
707 mov %l1, %o1
708 mov %l2, %o2
709 call handle_hw_divzero
710 mov %l0, %o3
712 RESTORE_ALL
714 .align 4
715 .globl do_flush_windows
716 do_flush_windows:
717 SAVE_ALL
719 wr %l0, PSR_ET, %psr
720 WRITE_PAUSE
722 andcc %l0, PSR_PS, %g0
723 bne dfw_kernel
724 nop
726 call flush_user_windows
727 nop
729 /* Advance over the trap instruction. */
730 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
731 add %l1, 0x4, %l2
732 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
733 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
735 RESTORE_ALL
737 .globl flush_patch_one
739 /* We get these for debugging routines using __builtin_return_address() */
740 dfw_kernel:
741 flush_patch_one:
742 FLUSH_ALL_KERNEL_WINDOWS
744 /* Advance over the trap instruction. */
745 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
746 add %l1, 0x4, %l2
747 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
748 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
750 RESTORE_ALL
752 /* The getcc software trap. The user wants the condition codes from
753 * the %psr in register %g1.
754 */
756 .align 4
757 .globl getcc_trap_handler
758 getcc_trap_handler:
759 srl %l0, 20, %g1 ! give user
760 and %g1, 0xf, %g1 ! only ICC bits in %psr
761 jmp %l2 ! advance over trap instruction
762 rett %l2 + 0x4 ! like this...
764 /* The setcc software trap. The user has condition codes in %g1
765 * that it would like placed in the %psr. Be careful not to flip
766 * any unintentional bits!
767 */
769 .align 4
770 .globl setcc_trap_handler
771 setcc_trap_handler:
772 sll %g1, 0x14, %l4
773 set PSR_ICC, %l5
774 andn %l0, %l5, %l0 ! clear ICC bits in %psr
775 and %l4, %l5, %l4 ! clear non-ICC bits in user value
776 or %l4, %l0, %l4 ! or them in... mix mix mix
778 wr %l4, 0x0, %psr ! set new %psr
779 WRITE_PAUSE ! TI scumbags...
781 jmp %l2 ! advance over trap instruction
782 rett %l2 + 0x4 ! like this...
784 .align 4
785 .globl linux_trap_nmi_sun4c
786 linux_trap_nmi_sun4c:
787 SAVE_ALL
789 /* Ugh, we need to clear the IRQ line. This is now
790 * a very sun4c specific trap handler...
791 */
792 sethi %hi(interrupt_enable), %l5
793 ld [%l5 + %lo(interrupt_enable)], %l5
794 ldub [%l5], %l6
795 andn %l6, INTS_ENAB, %l6
796 stb %l6, [%l5]
798 /* Now it is safe to re-enable traps without recursion. */
799 or %l0, PSR_PIL, %l0
800 wr %l0, PSR_ET, %psr
801 WRITE_PAUSE
803 /* Now call the c-code with the pt_regs frame ptr and the
804 * memory error registers as arguments. The ordering chosen
805 * here is due to unlatching semantics.
806 */
807 sethi %hi(AC_SYNC_ERR), %o0
808 add %o0, 0x4, %o0
809 lda [%o0] ASI_CONTROL, %o2 ! sync vaddr
810 sub %o0, 0x4, %o0
811 lda [%o0] ASI_CONTROL, %o1 ! sync error
812 add %o0, 0xc, %o0
813 lda [%o0] ASI_CONTROL, %o4 ! async vaddr
814 sub %o0, 0x4, %o0
815 lda [%o0] ASI_CONTROL, %o3 ! async error
816 call sparc_lvl15_nmi
817 add %sp, STACKFRAME_SZ, %o0
819 RESTORE_ALL
821 .align 4
822 .globl invalid_segment_patch1_ff
823 .globl invalid_segment_patch2_ff
824 invalid_segment_patch1_ff: cmp %l4, 0xff
825 invalid_segment_patch2_ff: mov 0xff, %l3
827 .align 4
828 .globl invalid_segment_patch1_1ff
829 .globl invalid_segment_patch2_1ff
830 invalid_segment_patch1_1ff: cmp %l4, 0x1ff
831 invalid_segment_patch2_1ff: mov 0x1ff, %l3
833 .align 4
834 .globl num_context_patch1_16, num_context_patch2_16
835 num_context_patch1_16: mov 0x10, %l7
836 num_context_patch2_16: mov 0x10, %l7
838 .align 4
839 .globl vac_linesize_patch_32
840 vac_linesize_patch_32: subcc %l7, 32, %l7
842 .align 4
843 .globl vac_hwflush_patch1_on, vac_hwflush_patch2_on
845 /*
846 * Ugly, but we cant use hardware flushing on the sun4 and we'd require
847 * two instructions (Anton)
848 */
849 #ifdef CONFIG_SUN4
850 vac_hwflush_patch1_on: nop
851 #else
852 vac_hwflush_patch1_on: addcc %l7, -PAGE_SIZE, %l7
853 #endif
855 vac_hwflush_patch2_on: sta %g0, [%l3 + %l7] ASI_HWFLUSHSEG
857 .globl invalid_segment_patch1, invalid_segment_patch2
858 .globl num_context_patch1
859 .globl vac_linesize_patch, vac_hwflush_patch1
860 .globl vac_hwflush_patch2
862 .align 4
863 .globl sun4c_fault
865 ! %l0 = %psr
866 ! %l1 = %pc
867 ! %l2 = %npc
868 ! %l3 = %wim
869 ! %l7 = 1 for textfault
870 ! We want error in %l5, vaddr in %l6
871 sun4c_fault:
872 #ifdef CONFIG_SUN4
873 sethi %hi(sun4c_memerr_reg), %l4
874 ld [%l4+%lo(sun4c_memerr_reg)], %l4 ! memerr ctrl reg addr
875 ld [%l4], %l6 ! memerr ctrl reg
876 ld [%l4 + 4], %l5 ! memerr vaddr reg
877 andcc %l6, 0x80, %g0 ! check for error type
878 st %g0, [%l4 + 4] ! clear the error
879 be 0f ! normal error
880 sethi %hi(AC_BUS_ERROR), %l4 ! bus err reg addr
882 call prom_halt ! something weird happened
883 ! what exactly did happen?
884 ! what should we do here?
886 0: or %l4, %lo(AC_BUS_ERROR), %l4 ! bus err reg addr
887 lduba [%l4] ASI_CONTROL, %l6 ! bus err reg
889 cmp %l7, 1 ! text fault?
890 be 1f ! yes
891 nop
893 ld [%l1], %l4 ! load instruction that caused fault
894 srl %l4, 21, %l4
895 andcc %l4, 1, %g0 ! store instruction?
897 be 1f ! no
898 sethi %hi(SUN4C_SYNC_BADWRITE), %l4 ! yep
899 ! %lo(SUN4C_SYNC_BADWRITE) = 0
900 or %l4, %l6, %l6 ! set write bit to emulate sun4c
901 1:
902 #else
903 sethi %hi(AC_SYNC_ERR), %l4
904 add %l4, 0x4, %l6 ! AC_SYNC_VA in %l6
905 lda [%l6] ASI_CONTROL, %l5 ! Address
906 lda [%l4] ASI_CONTROL, %l6 ! Error, retained for a bit
907 #endif
909 andn %l5, 0xfff, %l5 ! Encode all info into l7
910 srl %l6, 14, %l4
912 and %l4, 2, %l4
913 or %l5, %l4, %l4
915 or %l4, %l7, %l7 ! l7 = [addr,write,txtfault]
917 andcc %l0, PSR_PS, %g0
918 be sun4c_fault_fromuser
919 andcc %l7, 1, %g0 ! Text fault?
921 be 1f
922 sethi %hi(KERNBASE), %l4
924 mov %l1, %l5 ! PC
926 1:
927 cmp %l5, %l4
928 blu sun4c_fault_fromuser
929 sethi %hi(~((1 << SUN4C_REAL_PGDIR_SHIFT) - 1)), %l4
931 /* If the kernel references a bum kernel pointer, or a pte which
932 * points to a non existant page in ram, we will run this code
933 * _forever_ and lock up the machine!!!!! So we must check for
934 * this condition, the AC_SYNC_ERR bits are what we must examine.
935 * Also a parity error would make this happen as well. So we just
936 * check that we are in fact servicing a tlb miss and not some
937 * other type of fault for the kernel.
938 */
939 andcc %l6, 0x80, %g0
940 be sun4c_fault_fromuser
941 and %l5, %l4, %l5
943 /* Test for NULL pte_t * in vmalloc area. */
944 sethi %hi(VMALLOC_START), %l4
945 cmp %l5, %l4
946 blu,a invalid_segment_patch1
947 lduXa [%l5] ASI_SEGMAP, %l4
949 sethi %hi(swapper_pg_dir), %l4
950 srl %l5, SUN4C_PGDIR_SHIFT, %l6
951 or %l4, %lo(swapper_pg_dir), %l4
952 sll %l6, 2, %l6
953 ld [%l4 + %l6], %l4
954 #ifdef CONFIG_SUN4
955 sethi %hi(PAGE_MASK), %l6
956 andcc %l4, %l6, %g0
957 #else
958 andcc %l4, PAGE_MASK, %g0
959 #endif
960 be sun4c_fault_fromuser
961 lduXa [%l5] ASI_SEGMAP, %l4
963 invalid_segment_patch1:
964 cmp %l4, 0x7f
965 bne 1f
966 sethi %hi(sun4c_kfree_ring), %l4
967 or %l4, %lo(sun4c_kfree_ring), %l4
968 ld [%l4 + 0x18], %l3
969 deccc %l3 ! do we have a free entry?
970 bcs,a 2f ! no, unmap one.
971 sethi %hi(sun4c_kernel_ring), %l4
973 st %l3, [%l4 + 0x18] ! sun4c_kfree_ring.num_entries--
975 ld [%l4 + 0x00], %l6 ! entry = sun4c_kfree_ring.ringhd.next
976 st %l5, [%l6 + 0x08] ! entry->vaddr = address
978 ld [%l6 + 0x00], %l3 ! next = entry->next
979 ld [%l6 + 0x04], %l7 ! entry->prev
981 st %l7, [%l3 + 0x04] ! next->prev = entry->prev
982 st %l3, [%l7 + 0x00] ! entry->prev->next = next
984 sethi %hi(sun4c_kernel_ring), %l4
985 or %l4, %lo(sun4c_kernel_ring), %l4
986 ! head = &sun4c_kernel_ring.ringhd
988 ld [%l4 + 0x00], %l7 ! head->next
990 st %l4, [%l6 + 0x04] ! entry->prev = head
991 st %l7, [%l6 + 0x00] ! entry->next = head->next
992 st %l6, [%l7 + 0x04] ! head->next->prev = entry
994 st %l6, [%l4 + 0x00] ! head->next = entry
996 ld [%l4 + 0x18], %l3
997 inc %l3 ! sun4c_kernel_ring.num_entries++
998 st %l3, [%l4 + 0x18]
999 b 4f
1000 ld [%l6 + 0x08], %l5
1002 2:
1003 or %l4, %lo(sun4c_kernel_ring), %l4
1004 ! head = &sun4c_kernel_ring.ringhd
1006 ld [%l4 + 0x04], %l6 ! entry = head->prev
1008 ld [%l6 + 0x08], %l3 ! tmp = entry->vaddr
1010 ! Flush segment from the cache.
1011 #ifdef CONFIG_SUN4
1012 sethi %hi((128 * 1024)), %l7
1013 #else
1014 sethi %hi((64 * 1024)), %l7
1015 #endif
1016 9:
1017 vac_hwflush_patch1:
1018 vac_linesize_patch:
1019 subcc %l7, 16, %l7
1020 bne 9b
1021 vac_hwflush_patch2:
1022 sta %g0, [%l3 + %l7] ASI_FLUSHSEG
1024 st %l5, [%l6 + 0x08] ! entry->vaddr = address
1026 ld [%l6 + 0x00], %l5 ! next = entry->next
1027 ld [%l6 + 0x04], %l7 ! entry->prev
1029 st %l7, [%l5 + 0x04] ! next->prev = entry->prev
1030 st %l5, [%l7 + 0x00] ! entry->prev->next = next
1031 st %l4, [%l6 + 0x04] ! entry->prev = head
1033 ld [%l4 + 0x00], %l7 ! head->next
1035 st %l7, [%l6 + 0x00] ! entry->next = head->next
1036 st %l6, [%l7 + 0x04] ! head->next->prev = entry
1037 st %l6, [%l4 + 0x00] ! head->next = entry
1039 mov %l3, %l5 ! address = tmp
1041 4:
1042 num_context_patch1:
1043 mov 0x08, %l7
1045 ld [%l6 + 0x08], %l4
1046 ldub [%l6 + 0x0c], %l3
1047 or %l4, %l3, %l4 ! encode new vaddr/pseg into l4
1049 sethi %hi(AC_CONTEXT), %l3
1050 lduba [%l3] ASI_CONTROL, %l6
1052 /* Invalidate old mapping, instantiate new mapping,
1053 * for each context. Registers l6/l7 are live across
1054 * this loop.
1055 */
1056 3: deccc %l7
1057 sethi %hi(AC_CONTEXT), %l3
1058 stba %l7, [%l3] ASI_CONTROL
1059 invalid_segment_patch2:
1060 mov 0x7f, %l3
1061 stXa %l3, [%l5] ASI_SEGMAP
1062 andn %l4, 0x1ff, %l3
1063 bne 3b
1064 stXa %l4, [%l3] ASI_SEGMAP
1066 sethi %hi(AC_CONTEXT), %l3
1067 stba %l6, [%l3] ASI_CONTROL
1069 andn %l4, 0x1ff, %l5
1071 1:
1072 sethi %hi(VMALLOC_START), %l4
1073 cmp %l5, %l4
1075 bgeu 1f
1076 mov 1 << (SUN4C_REAL_PGDIR_SHIFT - PAGE_SHIFT), %l7
1078 sethi %hi(KERNBASE), %l6
1080 sub %l5, %l6, %l4
1081 srl %l4, PAGE_SHIFT, %l4
1082 sethi %hi((SUN4C_PAGE_KERNEL & 0xf4000000)), %l3
1083 or %l3, %l4, %l3
1085 sethi %hi(PAGE_SIZE), %l4
1087 2:
1088 sta %l3, [%l5] ASI_PTE
1089 deccc %l7
1090 inc %l3
1091 bne 2b
1092 add %l5, %l4, %l5
1094 b 7f
1095 sethi %hi(sun4c_kernel_faults), %l4
1097 1:
1098 srl %l5, SUN4C_PGDIR_SHIFT, %l3
1099 sethi %hi(swapper_pg_dir), %l4
1100 or %l4, %lo(swapper_pg_dir), %l4
1101 sll %l3, 2, %l3
1102 ld [%l4 + %l3], %l4
1103 #ifndef CONFIG_SUN4
1104 and %l4, PAGE_MASK, %l4
1105 #else
1106 sethi %hi(PAGE_MASK), %l6
1107 and %l4, %l6, %l4
1108 #endif
1110 srl %l5, (PAGE_SHIFT - 2), %l6
1111 and %l6, ((SUN4C_PTRS_PER_PTE - 1) << 2), %l6
1112 add %l6, %l4, %l6
1114 sethi %hi(PAGE_SIZE), %l4
1116 2:
1117 ld [%l6], %l3
1118 deccc %l7
1119 sta %l3, [%l5] ASI_PTE
1120 add %l6, 0x4, %l6
1121 bne 2b
1122 add %l5, %l4, %l5
1124 sethi %hi(sun4c_kernel_faults), %l4
1125 7:
1126 ld [%l4 + %lo(sun4c_kernel_faults)], %l3
1127 inc %l3
1128 st %l3, [%l4 + %lo(sun4c_kernel_faults)]
1130 /* Restore condition codes */
1131 wr %l0, 0x0, %psr
1132 WRITE_PAUSE
1133 jmp %l1
1134 rett %l2
1136 sun4c_fault_fromuser:
1137 SAVE_ALL
1138 nop
1140 mov %l7, %o1 ! Decode the info from %l7
1141 mov %l7, %o2
1142 and %o1, 1, %o1 ! arg2 = text_faultp
1143 mov %l7, %o3
1144 and %o2, 2, %o2 ! arg3 = writep
1145 andn %o3, 0xfff, %o3 ! arg4 = faulting address
1147 wr %l0, PSR_ET, %psr
1148 WRITE_PAUSE
1150 call do_sun4c_fault
1151 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
1153 RESTORE_ALL
1155 .align 4
1156 .globl srmmu_fault
1157 srmmu_fault:
1158 mov 0x400, %l5
1159 mov 0x300, %l4
1161 lda [%l5] ASI_M_MMUREGS, %l6 ! read sfar first
1162 lda [%l4] ASI_M_MMUREGS, %l5 ! read sfsr last
1164 andn %l6, 0xfff, %l6
1165 srl %l5, 6, %l5 ! and encode all info into l7
1167 and %l5, 2, %l5
1168 or %l5, %l6, %l6
1170 or %l6, %l7, %l7 ! l7 = [addr,write,txtfault]
1172 SAVE_ALL
1174 mov %l7, %o1
1175 mov %l7, %o2
1176 and %o1, 1, %o1 ! arg2 = text_faultp
1177 mov %l7, %o3
1178 and %o2, 2, %o2 ! arg3 = writep
1179 andn %o3, 0xfff, %o3 ! arg4 = faulting address
1181 wr %l0, PSR_ET, %psr
1182 WRITE_PAUSE
1184 call do_sparc_fault
1185 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
1187 RESTORE_ALL
1189 #ifdef CONFIG_SUNOS_EMUL
1190 /* SunOS uses syscall zero as the 'indirect syscall' it looks
1191 * like indir_syscall(scall_num, arg0, arg1, arg2...); etc.
1192 * This is complete brain damage.
1193 */
1194 .globl sunos_indir
1195 sunos_indir:
1196 mov %o7, %l4
1197 cmp %o0, NR_SYSCALLS
1198 blu,a 1f
1199 sll %o0, 0x2, %o0
1201 sethi %hi(sunos_nosys), %l6
1202 b 2f
1203 or %l6, %lo(sunos_nosys), %l6
1205 1:
1206 set sunos_sys_table, %l7
1207 ld [%l7 + %o0], %l6
1209 2:
1210 mov %o1, %o0
1211 mov %o2, %o1
1212 mov %o3, %o2
1213 mov %o4, %o3
1214 mov %o5, %o4
1215 call %l6
1216 mov %l4, %o7
1217 #endif
1219 .align 4
1220 .globl sys_nis_syscall
1221 sys_nis_syscall:
1222 mov %o7, %l5
1223 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
1224 call c_sys_nis_syscall
1225 mov %l5, %o7
1227 .align 4
1228 .globl sys_ptrace
1229 sys_ptrace:
1230 call do_ptrace
1231 add %sp, STACKFRAME_SZ, %o0
1233 ld [%curptr + TI_FLAGS], %l5
1234 andcc %l5, _TIF_SYSCALL_TRACE, %g0
1235 be 1f
1236 nop
1238 call syscall_trace
1239 nop
1241 1:
1242 RESTORE_ALL
1244 .align 4
1245 .globl sys_execve
1246 sys_execve:
1247 mov %o7, %l5
1248 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
1249 call sparc_execve
1250 mov %l5, %o7
1252 .align 4
1253 .globl sys_pipe
1254 sys_pipe:
1255 mov %o7, %l5
1256 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
1257 call sparc_pipe
1258 mov %l5, %o7
1260 .align 4
1261 .globl sys_sigaltstack
1262 sys_sigaltstack:
1263 mov %o7, %l5
1264 mov %fp, %o2
1265 call do_sigaltstack
1266 mov %l5, %o7
1268 .align 4
1269 .globl sys_sigstack
1270 sys_sigstack:
1271 mov %o7, %l5
1272 mov %fp, %o2
1273 call do_sys_sigstack
1274 mov %l5, %o7
1276 .align 4
1277 .globl sys_sigreturn
1278 sys_sigreturn:
1279 call do_sigreturn
1280 add %sp, STACKFRAME_SZ, %o0
1282 ld [%curptr + TI_FLAGS], %l5
1283 andcc %l5, _TIF_SYSCALL_TRACE, %g0
1284 be 1f
1285 nop
1287 call syscall_trace
1288 nop
1290 1:
1291 /* We don't want to muck with user registers like a
1292 * normal syscall, just return.
1293 */
1294 RESTORE_ALL
1296 .align 4
1297 .globl sys_rt_sigreturn
1298 sys_rt_sigreturn:
1299 call do_rt_sigreturn
1300 add %sp, STACKFRAME_SZ, %o0
1302 ld [%curptr + TI_FLAGS], %l5
1303 andcc %l5, _TIF_SYSCALL_TRACE, %g0
1304 be 1f
1305 nop
1307 call syscall_trace
1308 nop
1310 1:
1311 /* We are returning to a signal handler. */
1312 RESTORE_ALL
1314 /* Now that we have a real sys_clone, sys_fork() is
1315 * implemented in terms of it. Our _real_ implementation
1316 * of SunOS vfork() will use sys_vfork().
1317 *
1318 * XXX These three should be consolidated into mostly shared
1319 * XXX code just like on sparc64... -DaveM
1320 */
1321 .align 4
1322 .globl sys_fork, flush_patch_two
1323 sys_fork:
1324 mov %o7, %l5
1325 flush_patch_two:
1326 FLUSH_ALL_KERNEL_WINDOWS;
1327 ld [%curptr + TI_TASK], %o4
1328 rd %psr, %g4
1329 WRITE_PAUSE
1330 mov SIGCHLD, %o0 ! arg0: clone flags
1331 rd %wim, %g5
1332 WRITE_PAUSE
1333 mov %fp, %o1 ! arg1: usp
1334 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
1335 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
1336 mov 0, %o3
1337 call sparc_do_fork
1338 mov %l5, %o7
1340 /* Whee, kernel threads! */
1341 .globl sys_clone, flush_patch_three
1342 sys_clone:
1343 mov %o7, %l5
1344 flush_patch_three:
1345 FLUSH_ALL_KERNEL_WINDOWS;
1346 ld [%curptr + TI_TASK], %o4
1347 rd %psr, %g4
1348 WRITE_PAUSE
1350 /* arg0,1: flags,usp -- loaded already */
1351 cmp %o1, 0x0 ! Is new_usp NULL?
1352 rd %wim, %g5
1353 WRITE_PAUSE
1354 be,a 1f
1355 mov %fp, %o1 ! yes, use callers usp
1356 andn %o1, 7, %o1 ! no, align to 8 bytes
1357 1:
1358 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
1359 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
1360 mov 0, %o3
1361 call sparc_do_fork
1362 mov %l5, %o7
1364 /* Whee, real vfork! */
1365 .globl sys_vfork, flush_patch_four
1366 sys_vfork:
1367 flush_patch_four:
1368 FLUSH_ALL_KERNEL_WINDOWS;
1369 ld [%curptr + TI_TASK], %o4
1370 rd %psr, %g4
1371 WRITE_PAUSE
1372 rd %wim, %g5
1373 WRITE_PAUSE
1374 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
1375 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
1376 mov %fp, %o1
1377 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
1378 sethi %hi(sparc_do_fork), %l1
1379 mov 0, %o3
1380 jmpl %l1 + %lo(sparc_do_fork), %g0
1381 add %sp, STACKFRAME_SZ, %o2
1383 .align 4
1384 linux_sparc_ni_syscall:
1385 sethi %hi(sys_ni_syscall), %l7
1386 b syscall_is_too_hard
1387 or %l7, %lo(sys_ni_syscall), %l7
1389 linux_fast_syscall:
1390 andn %l7, 3, %l7
1391 mov %i0, %o0
1392 mov %i1, %o1
1393 mov %i2, %o2
1394 jmpl %l7 + %g0, %g0
1395 mov %i3, %o3
1397 linux_syscall_trace:
1398 call syscall_trace
1399 nop
1400 mov %i0, %o0
1401 mov %i1, %o1
1402 mov %i2, %o2
1403 mov %i3, %o3
1404 b 2f
1405 mov %i4, %o4
1407 .globl ret_from_fork
1408 ret_from_fork:
1409 call schedule_tail
1410 mov %g3, %o0
1411 b ret_sys_call
1412 ld [%sp + STACKFRAME_SZ + PT_I0], %o0
1414 /* Linux native and SunOS system calls enter here... */
1415 .align 4
1416 .globl linux_sparc_syscall
1417 linux_sparc_syscall:
1418 /* Direct access to user regs, must faster. */
1419 cmp %g1, NR_SYSCALLS
1420 bgeu linux_sparc_ni_syscall
1421 sll %g1, 2, %l4
1422 ld [%l7 + %l4], %l7
1423 andcc %l7, 1, %g0
1424 bne linux_fast_syscall
1425 /* Just do first insn from SAVE_ALL in the delay slot */
1427 .globl syscall_is_too_hard
1428 syscall_is_too_hard:
1429 SAVE_ALL_HEAD
1430 rd %wim, %l3
1432 wr %l0, PSR_ET, %psr
1433 mov %i0, %o0
1434 mov %i1, %o1
1435 mov %i2, %o2
1437 ld [%curptr + TI_FLAGS], %l5
1438 mov %i3, %o3
1439 andcc %l5, _TIF_SYSCALL_TRACE, %g0
1440 mov %i4, %o4
1441 bne linux_syscall_trace
1442 mov %i0, %l5
1443 2:
1444 call %l7
1445 mov %i5, %o5
1447 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1449 .globl ret_sys_call
1450 ret_sys_call:
1451 ld [%curptr + TI_FLAGS], %l6
1452 cmp %o0, -ERESTART_RESTARTBLOCK
1453 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
1454 set PSR_C, %g2
1455 bgeu 1f
1456 andcc %l6, _TIF_SYSCALL_TRACE, %g0
1458 /* System call success, clear Carry condition code. */
1459 andn %g3, %g2, %g3
1460 clr %l6
1461 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1462 bne linux_syscall_trace2
1463 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1464 add %l1, 0x4, %l2 /* npc = npc+4 */
1465 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1466 b ret_trap_entry
1467 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1468 1:
1469 /* System call failure, set Carry condition code.
1470 * Also, get abs(errno) to return to the process.
1471 */
1472 sub %g0, %o0, %o0
1473 or %g3, %g2, %g3
1474 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1475 mov 1, %l6
1476 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1477 bne linux_syscall_trace2
1478 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1479 add %l1, 0x4, %l2 /* npc = npc+4 */
1480 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1481 b ret_trap_entry
1482 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1484 linux_syscall_trace2:
1485 call syscall_trace
1486 add %l1, 0x4, %l2 /* npc = npc+4 */
1487 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1488 b ret_trap_entry
1489 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1492 /*
1493 * Solaris system calls and indirect system calls enter here.
1494 *
1495 * I have named the solaris indirect syscalls like that because
1496 * it seems like Solaris has some fast path syscalls that can
1497 * be handled as indirect system calls. - mig
1498 */
1500 linux_syscall_for_solaris:
1501 sethi %hi(sys_call_table), %l7
1502 b linux_sparc_syscall
1503 or %l7, %lo(sys_call_table), %l7
1505 .align 4
1506 .globl solaris_syscall
1507 solaris_syscall:
1508 cmp %g1,59
1509 be linux_syscall_for_solaris
1510 cmp %g1,2
1511 be linux_syscall_for_solaris
1512 cmp %g1,42
1513 be linux_syscall_for_solaris
1514 cmp %g1,119
1515 be,a linux_syscall_for_solaris
1516 mov 2, %g1
1517 1:
1518 SAVE_ALL_HEAD
1519 rd %wim, %l3
1521 wr %l0, PSR_ET, %psr
1522 nop
1523 nop
1524 mov %i0, %l5
1526 call do_solaris_syscall
1527 add %sp, STACKFRAME_SZ, %o0
1529 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1530 set PSR_C, %g2
1531 cmp %o0, -ERESTART_RESTARTBLOCK
1532 bgeu 1f
1533 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
1535 /* System call success, clear Carry condition code. */
1536 andn %g3, %g2, %g3
1537 clr %l6
1538 b 2f
1539 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1541 1:
1542 /* System call failure, set Carry condition code.
1543 * Also, get abs(errno) to return to the process.
1544 */
1545 sub %g0, %o0, %o0
1546 mov 1, %l6
1547 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1548 or %g3, %g2, %g3
1549 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1551 /* Advance the pc and npc over the trap instruction.
1552 * If the npc is unaligned (has a 1 in the lower byte), it means
1553 * the kernel does not want us to play magic (ie, skipping over
1554 * traps). Mainly when the Solaris code wants to set some PC and
1555 * nPC (setcontext).
1556 */
1557 2:
1558 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1559 andcc %l1, 1, %g0
1560 bne 1f
1561 add %l1, 0x4, %l2 /* npc = npc+4 */
1562 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1563 b ret_trap_entry
1564 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1566 /* kernel knows what it is doing, fixup npc and continue */
1567 1:
1568 sub %l1, 1, %l1
1569 b ret_trap_entry
1570 st %l1, [%sp + STACKFRAME_SZ + PT_NPC]
1572 #ifndef CONFIG_SUNOS_EMUL
1573 .align 4
1574 .globl sunos_syscall
1575 sunos_syscall:
1576 SAVE_ALL_HEAD
1577 rd %wim, %l3
1578 wr %l0, PSR_ET, %psr
1579 nop
1580 nop
1581 mov %i0, %l5
1582 call do_sunos_syscall
1583 add %sp, STACKFRAME_SZ, %o0
1584 #endif
1586 /* {net, open}bsd system calls enter here... */
1587 .align 4
1588 .globl bsd_syscall
1589 bsd_syscall:
1590 /* Direct access to user regs, must faster. */
1591 cmp %g1, NR_SYSCALLS
1592 blu,a 1f
1593 sll %g1, 2, %l4
1595 set sys_ni_syscall, %l7
1596 b bsd_is_too_hard
1597 nop
1599 1:
1600 ld [%l7 + %l4], %l7
1602 .globl bsd_is_too_hard
1603 bsd_is_too_hard:
1604 rd %wim, %l3
1605 SAVE_ALL
1607 wr %l0, PSR_ET, %psr
1608 WRITE_PAUSE
1610 2:
1611 mov %i0, %o0
1612 mov %i1, %o1
1613 mov %i2, %o2
1614 mov %i0, %l5
1615 mov %i3, %o3
1616 mov %i4, %o4
1617 call %l7
1618 mov %i5, %o5
1620 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1621 set PSR_C, %g2
1622 cmp %o0, -ERESTART_RESTARTBLOCK
1623 bgeu 1f
1624 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
1626 /* System call success, clear Carry condition code. */
1627 andn %g3, %g2, %g3
1628 clr %l6
1629 b 2f
1630 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1632 1:
1633 /* System call failure, set Carry condition code.
1634 * Also, get abs(errno) to return to the process.
1635 */
1636 sub %g0, %o0, %o0
1637 #if 0 /* XXX todo XXX */
1638 sethi %hi(bsd_xlatb_rorl), %o3
1639 or %o3, %lo(bsd_xlatb_rorl), %o3
1640 sll %o0, 2, %o0
1641 ld [%o3 + %o0], %o0
1642 #endif
1643 mov 1, %l6
1644 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
1645 or %g3, %g2, %g3
1646 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
1648 /* Advance the pc and npc over the trap instruction. */
1649 2:
1650 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
1651 add %l1, 0x4, %l2 /* npc = npc+4 */
1652 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
1653 b ret_trap_entry
1654 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
1656 /* Saving and restoring the FPU state is best done from lowlevel code.
1657 *
1658 * void fpsave(unsigned long *fpregs, unsigned long *fsr,
1659 * void *fpqueue, unsigned long *fpqdepth)
1660 */
1662 .globl fpsave
1663 fpsave:
1664 st %fsr, [%o1] ! this can trap on us if fpu is in bogon state
1665 ld [%o1], %g1
1666 set 0x2000, %g4
1667 andcc %g1, %g4, %g0
1668 be 2f
1669 mov 0, %g2
1671 /* We have an fpqueue to save. */
1672 1:
1673 std %fq, [%o2]
1674 fpsave_magic:
1675 st %fsr, [%o1]
1676 ld [%o1], %g3
1677 andcc %g3, %g4, %g0
1678 add %g2, 1, %g2
1679 bne 1b
1680 add %o2, 8, %o2
1682 2:
1683 st %g2, [%o3]
1685 std %f0, [%o0 + 0x00]
1686 std %f2, [%o0 + 0x08]
1687 std %f4, [%o0 + 0x10]
1688 std %f6, [%o0 + 0x18]
1689 std %f8, [%o0 + 0x20]
1690 std %f10, [%o0 + 0x28]
1691 std %f12, [%o0 + 0x30]
1692 std %f14, [%o0 + 0x38]
1693 std %f16, [%o0 + 0x40]
1694 std %f18, [%o0 + 0x48]
1695 std %f20, [%o0 + 0x50]
1696 std %f22, [%o0 + 0x58]
1697 std %f24, [%o0 + 0x60]
1698 std %f26, [%o0 + 0x68]
1699 std %f28, [%o0 + 0x70]
1700 retl
1701 std %f30, [%o0 + 0x78]
1703 /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
1704 * code for pointing out this possible deadlock, while we save state
1705 * above we could trap on the fsr store so our low level fpu trap
1706 * code has to know how to deal with this.
1707 */
1708 fpsave_catch:
1709 b fpsave_magic + 4
1710 st %fsr, [%o1]
1712 fpsave_catch2:
1713 b fpsave + 4
1714 st %fsr, [%o1]
1716 /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
1718 .globl fpload
1719 fpload:
1720 ldd [%o0 + 0x00], %f0
1721 ldd [%o0 + 0x08], %f2
1722 ldd [%o0 + 0x10], %f4
1723 ldd [%o0 + 0x18], %f6
1724 ldd [%o0 + 0x20], %f8
1725 ldd [%o0 + 0x28], %f10
1726 ldd [%o0 + 0x30], %f12
1727 ldd [%o0 + 0x38], %f14
1728 ldd [%o0 + 0x40], %f16
1729 ldd [%o0 + 0x48], %f18
1730 ldd [%o0 + 0x50], %f20
1731 ldd [%o0 + 0x58], %f22
1732 ldd [%o0 + 0x60], %f24
1733 ldd [%o0 + 0x68], %f26
1734 ldd [%o0 + 0x70], %f28
1735 ldd [%o0 + 0x78], %f30
1736 ld [%o1], %fsr
1737 retl
1738 nop
1740 /* __ndelay and __udelay take two arguments:
1741 * 0 - nsecs or usecs to delay
1742 * 1 - per_cpu udelay_val (loops per jiffy)
1743 *
1744 * Note that ndelay gives HZ times higher resolution but has a 10ms
1745 * limit. udelay can handle up to 1s.
1746 */
1747 .globl __ndelay
1748 __ndelay:
1749 save %sp, -STACKFRAME_SZ, %sp
1750 mov %i0, %o0
1751 call .umul ! round multiplier up so large ns ok
1752 mov 0x1ae, %o1 ! 2**32 / (1 000 000 000 / HZ)
1753 call .umul
1754 mov %i1, %o1 ! udelay_val
1755 ba delay_continue
1756 mov %o1, %o0 ! >>32 later for better resolution
1758 .globl __udelay
1759 __udelay:
1760 save %sp, -STACKFRAME_SZ, %sp
1761 mov %i0, %o0
1762 sethi %hi(0x10c7), %o1 ! round multiplier up so large us ok
1763 call .umul
1764 or %o1, %lo(0x10c7), %o1 ! 2**32 / 1 000 000
1765 call .umul
1766 mov %i1, %o1 ! udelay_val
1767 sethi %hi(0x028f4b62), %l0 ! Add in rounding constant * 2**32,
1768 or %g0, %lo(0x028f4b62), %l0
1769 addcc %o0, %l0, %o0 ! 2**32 * 0.009 999
1770 bcs,a 3f
1771 add %o1, 0x01, %o1
1772 3:
1773 call .umul
1774 mov HZ, %o0 ! >>32 earlier for wider range
1776 delay_continue:
1777 cmp %o0, 0x0
1778 1:
1779 bne 1b
1780 subcc %o0, 1, %o0
1782 ret
1783 restore
1785 /* Handle a software breakpoint */
1786 /* We have to inform parent that child has stopped */
1787 .align 4
1788 .globl breakpoint_trap
1789 breakpoint_trap:
1790 rd %wim,%l3
1791 SAVE_ALL
1792 wr %l0, PSR_ET, %psr
1793 WRITE_PAUSE
1795 st %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
1796 call sparc_breakpoint
1797 add %sp, STACKFRAME_SZ, %o0
1799 RESTORE_ALL
1801 .align 4
1802 .globl __handle_exception, flush_patch_exception
1803 __handle_exception:
1804 flush_patch_exception:
1805 FLUSH_ALL_KERNEL_WINDOWS;
1806 ldd [%o0], %o6
1807 jmpl %o7 + 0xc, %g0 ! see asm-sparc/processor.h
1808 mov 1, %g1 ! signal EFAULT condition
1810 .align 4
1811 .globl kill_user_windows, kuw_patch1_7win
1812 .globl kuw_patch1
1813 kuw_patch1_7win: sll %o3, 6, %o3
1815 /* No matter how much overhead this routine has in the worst
1816 * case scenerio, it is several times better than taking the
1817 * traps with the old method of just doing flush_user_windows().
1818 */
1819 kill_user_windows:
1820 ld [%g6 + TI_UWINMASK], %o0 ! get current umask
1821 orcc %g0, %o0, %g0 ! if no bits set, we are done
1822 be 3f ! nothing to do
1823 rd %psr, %o5 ! must clear interrupts
1824 or %o5, PSR_PIL, %o4 ! or else that could change
1825 wr %o4, 0x0, %psr ! the uwinmask state
1826 WRITE_PAUSE ! burn them cycles
1827 1:
1828 ld [%g6 + TI_UWINMASK], %o0 ! get consistent state
1829 orcc %g0, %o0, %g0 ! did an interrupt come in?
1830 be 4f ! yep, we are done
1831 rd %wim, %o3 ! get current wim
1832 srl %o3, 1, %o4 ! simulate a save
1833 kuw_patch1:
1834 sll %o3, 7, %o3 ! compute next wim
1835 or %o4, %o3, %o3 ! result
1836 andncc %o0, %o3, %o0 ! clean this bit in umask
1837 bne kuw_patch1 ! not done yet
1838 srl %o3, 1, %o4 ! begin another save simulation
1839 wr %o3, 0x0, %wim ! set the new wim
1840 st %g0, [%g6 + TI_UWINMASK] ! clear uwinmask
1841 4:
1842 wr %o5, 0x0, %psr ! re-enable interrupts
1843 WRITE_PAUSE ! burn baby burn
1844 3:
1845 retl ! return
1846 st %g0, [%g6 + TI_W_SAVED] ! no windows saved
1848 .align 4
1849 .globl restore_current
1850 restore_current:
1851 LOAD_CURRENT(g6, o0)
1852 retl
1853 nop
1855 #ifdef CONFIG_PCI
1856 #include <asm/pcic.h>
1858 .align 4
1859 .globl linux_trap_ipi15_pcic
1860 linux_trap_ipi15_pcic:
1861 rd %wim, %l3
1862 SAVE_ALL
1864 /*
1865 * First deactivate NMI
1866 * or we cannot drop ET, cannot get window spill traps.
1867 * The busy loop is necessary because the PIO error
1868 * sometimes does not go away quickly and we trap again.
1869 */
1870 sethi %hi(pcic_regs), %o1
1871 ld [%o1 + %lo(pcic_regs)], %o2
1873 ! Get pending status for printouts later.
1874 ld [%o2 + PCI_SYS_INT_PENDING], %o0
1876 mov PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
1877 stb %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
1878 1:
1879 ld [%o2 + PCI_SYS_INT_PENDING], %o1
1880 andcc %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
1881 bne 1b
1882 nop
1884 or %l0, PSR_PIL, %l4
1885 wr %l4, 0x0, %psr
1886 WRITE_PAUSE
1887 wr %l4, PSR_ET, %psr
1888 WRITE_PAUSE
1890 call pcic_nmi
1891 add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
1892 RESTORE_ALL
1894 .globl pcic_nmi_trap_patch
1895 pcic_nmi_trap_patch:
1896 sethi %hi(linux_trap_ipi15_pcic), %l3
1897 jmpl %l3 + %lo(linux_trap_ipi15_pcic), %g0
1898 rd %psr, %l0
1899 .word 0
1901 #endif /* CONFIG_PCI */
1903 /* End of entry.S */