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1###############################################################################
2#
3# MN10300 Exception and interrupt entry points
4#
5# Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
6# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
7# Modified by David Howells (dhowells@redhat.com)
8#
9# This program is free software; you can redistribute it and/or
10# modify it under the terms of the GNU General Public Licence
11# as published by the Free Software Foundation; either version
12# 2 of the Licence, or (at your option) any later version.
13#
14###############################################################################
15#include <linux/sys.h>
16#include <linux/linkage.h>
17#include <asm/smp.h>
18#include <asm/system.h>
19#include <asm/thread_info.h>
20#include <asm/intctl-regs.h>
21#include <asm/busctl-regs.h>
22#include <asm/timer-regs.h>
23#include <asm/unit/leds.h>
24#include <asm/page.h>
25#include <asm/pgtable.h>
26#include <asm/errno.h>
27#include <asm/asm-offsets.h>
28#include <asm/frame.inc>
29
30#ifdef CONFIG_PREEMPT
31#define preempt_stop __cli
32#else
33#define preempt_stop
34#define resume_kernel restore_all
35#endif
36
37 .macro __cli
38 and ~EPSW_IM,epsw
39 or EPSW_IE|MN10300_CLI_LEVEL,epsw
40 nop
41 nop
42 nop
43 .endm
44 .macro __sti
45 or EPSW_IE|EPSW_IM_7,epsw
46 .endm
47
48
49 .am33_2
50
51###############################################################################
52#
53# the return path for a forked child
54# - on entry, D0 holds the address of the previous task to run
55#
56###############################################################################
57ENTRY(ret_from_fork)
58 call schedule_tail[],0
59 GET_THREAD_INFO a2
60
61 # return 0 to indicate child process
62 clr d0
63 mov d0,(REG_D0,fp)
64 jmp syscall_exit
65
66###############################################################################
67#
68# system call handler
69#
70###############################################################################
71ENTRY(system_call)
72 add -4,sp
73 SAVE_ALL
74 mov d0,(REG_ORIG_D0,fp)
75 GET_THREAD_INFO a2
76 cmp nr_syscalls,d0
77 bcc syscall_badsys
78 btst _TIF_SYSCALL_TRACE,(TI_flags,a2)
79 bne syscall_trace_entry
80syscall_call:
81 add d0,d0,a1
82 add a1,a1
83 mov (REG_A0,fp),d0
84 mov (sys_call_table,a1),a0
85 calls (a0)
86 mov d0,(REG_D0,fp)
87syscall_exit:
88 # make sure we don't miss an interrupt setting need_resched or
89 # sigpending between sampling and the rti
90 __cli
91 mov (TI_flags,a2),d2
92 btst _TIF_ALLWORK_MASK,d2
93 bne syscall_exit_work
94restore_all:
95 RESTORE_ALL
96
97###############################################################################
98#
99# perform work that needs to be done immediately before resumption and syscall
100# tracing
101#
102###############################################################################
103 ALIGN
104syscall_exit_work:
105 btst _TIF_SYSCALL_TRACE,d2
106 beq work_pending
107 __sti # could let do_syscall_trace() call
108 # schedule() instead
109 mov fp,d0
110 mov 1,d1
111 call do_syscall_trace[],0 # do_syscall_trace(regs,entryexit)
112 jmp resume_userspace
113
114 ALIGN
115work_pending:
116 btst _TIF_NEED_RESCHED,d2
117 beq work_notifysig
118
119work_resched:
120 call schedule[],0
121
122 # make sure we don't miss an interrupt setting need_resched or
123 # sigpending between sampling and the rti
124 __cli
125
126 # is there any work to be done other than syscall tracing?
127 mov (TI_flags,a2),d2
128 btst _TIF_WORK_MASK,d2
129 beq restore_all
130 btst _TIF_NEED_RESCHED,d2
131 bne work_resched
132
133 # deal with pending signals and notify-resume requests
134work_notifysig:
135 mov fp,d0
136 mov d2,d1
137 call do_notify_resume[],0
138 jmp resume_userspace
139
140 # perform syscall entry tracing
141syscall_trace_entry:
142 mov -ENOSYS,d0
143 mov d0,(REG_D0,fp)
144 mov fp,d0
145 clr d1
146 call do_syscall_trace[],0
147 mov (REG_ORIG_D0,fp),d0
148 mov (REG_D1,fp),d1
149 cmp nr_syscalls,d0
150 bcs syscall_call
151 jmp syscall_exit
152
153syscall_badsys:
154 mov -ENOSYS,d0
155 mov d0,(REG_D0,fp)
156 jmp resume_userspace
157
158 # userspace resumption stub bypassing syscall exit tracing
159 .globl ret_from_exception, ret_from_intr
160 ALIGN
161ret_from_exception:
162 preempt_stop
163ret_from_intr:
164 GET_THREAD_INFO a2
165 mov (REG_EPSW,fp),d0 # need to deliver signals before
166 # returning to userspace
167 and EPSW_nSL,d0
168 beq resume_kernel # returning to supervisor mode
169
170ENTRY(resume_userspace)
171 # make sure we don't miss an interrupt setting need_resched or
172 # sigpending between sampling and the rti
173 __cli
174
175 # is there any work to be done on int/exception return?
176 mov (TI_flags,a2),d2
177 btst _TIF_WORK_MASK,d2
178 bne work_pending
179 jmp restore_all
180
181#ifdef CONFIG_PREEMPT
182ENTRY(resume_kernel)
183 mov (TI_preempt_count,a2),d0 # non-zero preempt_count ?
184 cmp 0,d0
185 bne restore_all
186
187need_resched:
188 btst _TIF_NEED_RESCHED,(TI_flags,a2)
189 beq restore_all
190 mov (REG_EPSW,fp),d0
191 and EPSW_IM,d0
192 cmp EPSW_IM_7,d0 # interrupts off (exception path) ?
193 beq restore_all
194 call preempt_schedule_irq[],0
195 jmp need_resched
196#endif
197
198
199###############################################################################
200#
201# IRQ handler entry point
202# - intended to be entered at multiple priorities
203#
204###############################################################################
205ENTRY(irq_handler)
206 add -4,sp
207 SAVE_ALL
208
209 # it's not a syscall
210 mov 0xffffffff,d0
211 mov d0,(REG_ORIG_D0,fp)
212
213 mov fp,d0
214 call do_IRQ[],0 # do_IRQ(regs)
215
216 jmp ret_from_intr
217
218###############################################################################
219#
220# Monitor Signal handler entry point
221#
222###############################################################################
223ENTRY(monitor_signal)
224 movbu (0xae000001),d1
225 cmp 1,d1
226 beq monsignal
227 ret [],0
228
229monsignal:
230 or EPSW_NMID,epsw
231 mov d0,a0
232 mov a0,sp
233 mov (REG_EPSW,fp),d1
234 and ~EPSW_nSL,d1
235 mov d1,(REG_EPSW,fp)
236 movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
237 mov (sp),a1
238 mov a1,usp
239 movm (sp),[other]
240 add 4,sp
241here: jmp 0x8e000008-here+0x8e000008
242
243###############################################################################
244#
245# Double Fault handler entry point
246# - note that there will not be a stack, D0/A0 will hold EPSW/PC as were
247#
248###############################################################################
249 .section .bss
250 .balign THREAD_SIZE
251 .space THREAD_SIZE
252__df_stack:
253 .previous
254
255ENTRY(double_fault)
256 mov a0,(__df_stack-4) # PC as was
257 mov d0,(__df_stack-8) # EPSW as was
258 mn10300_set_dbfleds # display 'db-f' on the LEDs
259 mov 0xaa55aa55,d0
260 mov d0,(__df_stack-12) # no ORIG_D0
261 mov sp,a0 # save corrupted SP
262 mov __df_stack-12,sp # emergency supervisor stack
263 SAVE_ALL
264 mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got
265 # clobbered by the CPU)
266 mov fp,d0
267 calls do_double_fault
268double_fault_loop:
269 bra double_fault_loop
270
271###############################################################################
272#
273# Bus Error handler entry point
274# - handle external (async) bus errors separately
275#
276###############################################################################
277ENTRY(raw_bus_error)
278 add -4,sp
279 mov d0,(sp)
280 mov (BCBERR),d0 # what
281 btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error
282 beq __common_exception_aux # it wasn't
283
284 SAVE_ALL
285 mov (BCBEAR),d1 # destination of erroneous access
286
287 mov (REG_ORIG_D0,fp),d2
288 mov d2,(REG_D0,fp)
289 mov -1,d2
290 mov d2,(REG_ORIG_D0,fp)
291
292 add -4,sp
293 mov fp,(12,sp) # frame pointer
294 call io_bus_error[],0
295 jmp restore_all
296
297###############################################################################
298#
299# Miscellaneous exception entry points
300#
301###############################################################################
302ENTRY(nmi_handler)
303 add -4,sp
304 mov d0,(sp)
305 mov (TBR),d0
306 bra __common_exception_nonmi
307
308ENTRY(__common_exception)
309 add -4,sp
310 mov d0,(sp)
311
312__common_exception_aux:
313 mov (TBR),d0
314 and ~EPSW_NMID,epsw # turn NMIs back on if not NMI
315 or EPSW_IE,epsw
316
317__common_exception_nonmi:
318 and 0x0000FFFF,d0 # turn the exception code into a vector
319 # table index
320
321 btst 0x00000007,d0
322 bne 1f
323 cmp 0x00000400,d0
324 bge 1f
325
326 SAVE_ALL # build the stack frame
327
328 mov (REG_D0,fp),a2 # get the exception number
329 mov (REG_ORIG_D0,fp),d0
330 mov d0,(REG_D0,fp)
331 mov -1,d0
332 mov d0,(REG_ORIG_D0,fp)
333
334#ifdef CONFIG_GDBSTUB
335 btst 0x01,(gdbstub_busy)
336 beq 2f
337 and ~EPSW_IE,epsw
338 mov fp,d0
339 mov a2,d1
340 call gdbstub_exception[],0 # gdbstub itself caused an exception
341 bra restore_all
3422:
343#endif
344
345 mov fp,d0 # arg 0: stacked register file
346 mov a2,d1 # arg 1: exception number
347 lsr 1,a2
348
349 mov (exception_table,a2),a2
350 calls (a2)
351 jmp ret_from_exception
352
3531: pi # BUG() equivalent
354
355###############################################################################
356#
357# Exception handler functions table
358#
359###############################################################################
360 .data
361ENTRY(exception_table)
362 .rept 0x400>>1
363 .long uninitialised_exception
364 .endr
365 .previous
366
367###############################################################################
368#
369# Change an entry in the exception table
370# - D0 exception code, D1 handler
371#
372###############################################################################
373ENTRY(set_excp_vector)
374 lsr 1,d0
375 add exception_table,d0
376 mov d1,(d0)
377 mov 4,d1
378#if defined(CONFIG_MN10300_CACHE_WBACK)
379 jmp mn10300_dcache_flush_inv_range2
380#else
381 ret [],0
382#endif
383
384###############################################################################
385#
386# System call table
387#
388###############################################################################
389 .data
390ENTRY(sys_call_table)
391 .long sys_restart_syscall /* 0 */
392 .long sys_exit
393 .long sys_fork
394 .long sys_read
395 .long sys_write
396 .long sys_open /* 5 */
397 .long sys_close
398 .long sys_waitpid
399 .long sys_creat
400 .long sys_link
401 .long sys_unlink /* 10 */
402 .long sys_execve
403 .long sys_chdir
404 .long sys_time
405 .long sys_mknod
406 .long sys_chmod /* 15 */
407 .long sys_lchown16
408 .long sys_ni_syscall /* old break syscall holder */
409 .long sys_stat
410 .long sys_lseek
411 .long sys_getpid /* 20 */
412 .long sys_mount
413 .long sys_oldumount
414 .long sys_setuid16
415 .long sys_getuid16
416 .long sys_stime /* 25 */
417 .long sys_ptrace
418 .long sys_alarm
419 .long sys_fstat
420 .long sys_pause
421 .long sys_utime /* 30 */
422 .long sys_ni_syscall /* old stty syscall holder */
423 .long sys_ni_syscall /* old gtty syscall holder */
424 .long sys_access
425 .long sys_nice
426 .long sys_ni_syscall /* 35 - old ftime syscall holder */
427 .long sys_sync
428 .long sys_kill
429 .long sys_rename
430 .long sys_mkdir
431 .long sys_rmdir /* 40 */
432 .long sys_dup
433 .long sys_pipe
434 .long sys_times
435 .long sys_ni_syscall /* old prof syscall holder */
436 .long sys_brk /* 45 */
437 .long sys_setgid16
438 .long sys_getgid16
439 .long sys_signal
440 .long sys_geteuid16
441 .long sys_getegid16 /* 50 */
442 .long sys_acct
443 .long sys_umount /* recycled never used phys() */
444 .long sys_ni_syscall /* old lock syscall holder */
445 .long sys_ioctl
446 .long sys_fcntl /* 55 */
447 .long sys_ni_syscall /* old mpx syscall holder */
448 .long sys_setpgid
449 .long sys_ni_syscall /* old ulimit syscall holder */
450 .long sys_ni_syscall /* old sys_olduname */
451 .long sys_umask /* 60 */
452 .long sys_chroot
453 .long sys_ustat
454 .long sys_dup2
455 .long sys_getppid
456 .long sys_getpgrp /* 65 */
457 .long sys_setsid
458 .long sys_sigaction
459 .long sys_sgetmask
460 .long sys_ssetmask
461 .long sys_setreuid16 /* 70 */
462 .long sys_setregid16
463 .long sys_sigsuspend
464 .long sys_sigpending
465 .long sys_sethostname
466 .long sys_setrlimit /* 75 */
467 .long sys_old_getrlimit
468 .long sys_getrusage
469 .long sys_gettimeofday
470 .long sys_settimeofday
471 .long sys_getgroups16 /* 80 */
472 .long sys_setgroups16
473 .long old_select
474 .long sys_symlink
475 .long sys_lstat
476 .long sys_readlink /* 85 */
477 .long sys_uselib
478 .long sys_swapon
479 .long sys_reboot
480 .long old_readdir
481 .long old_mmap /* 90 */
482 .long sys_munmap
483 .long sys_truncate
484 .long sys_ftruncate
485 .long sys_fchmod
486 .long sys_fchown16 /* 95 */
487 .long sys_getpriority
488 .long sys_setpriority
489 .long sys_ni_syscall /* old profil syscall holder */
490 .long sys_statfs
491 .long sys_fstatfs /* 100 */
492 .long sys_ni_syscall /* ioperm */
493 .long sys_socketcall
494 .long sys_syslog
495 .long sys_setitimer
496 .long sys_getitimer /* 105 */
497 .long sys_newstat
498 .long sys_newlstat
499 .long sys_newfstat
500 .long sys_ni_syscall /* old sys_uname */
501 .long sys_ni_syscall /* 110 - iopl */
502 .long sys_vhangup
503 .long sys_ni_syscall /* old "idle" system call */
504 .long sys_ni_syscall /* vm86old */
505 .long sys_wait4
506 .long sys_swapoff /* 115 */
507 .long sys_sysinfo
508 .long sys_ipc
509 .long sys_fsync
510 .long sys_sigreturn
511 .long sys_clone /* 120 */
512 .long sys_setdomainname
513 .long sys_newuname
514 .long sys_ni_syscall /* modify_ldt */
515 .long sys_adjtimex
516 .long sys_mprotect /* 125 */
517 .long sys_sigprocmask
518 .long sys_ni_syscall /* old "create_module" */
519 .long sys_init_module
520 .long sys_delete_module
521 .long sys_ni_syscall /* 130: old "get_kernel_syms" */
522 .long sys_quotactl
523 .long sys_getpgid
524 .long sys_fchdir
525 .long sys_bdflush
526 .long sys_sysfs /* 135 */
527 .long sys_personality
528 .long sys_ni_syscall /* reserved for afs_syscall */
529 .long sys_setfsuid16
530 .long sys_setfsgid16
531 .long sys_llseek /* 140 */
532 .long sys_getdents
533 .long sys_select
534 .long sys_flock
535 .long sys_msync
536 .long sys_readv /* 145 */
537 .long sys_writev
538 .long sys_getsid
539 .long sys_fdatasync
540 .long sys_sysctl
541 .long sys_mlock /* 150 */
542 .long sys_munlock
543 .long sys_mlockall
544 .long sys_munlockall
545 .long sys_sched_setparam
546 .long sys_sched_getparam /* 155 */
547 .long sys_sched_setscheduler
548 .long sys_sched_getscheduler
549 .long sys_sched_yield
550 .long sys_sched_get_priority_max
551 .long sys_sched_get_priority_min /* 160 */
552 .long sys_sched_rr_get_interval
553 .long sys_nanosleep
554 .long sys_mremap
555 .long sys_setresuid16
556 .long sys_getresuid16 /* 165 */
557 .long sys_ni_syscall /* vm86 */
558 .long sys_ni_syscall /* Old sys_query_module */
559 .long sys_poll
560 .long sys_nfsservctl
561 .long sys_setresgid16 /* 170 */
562 .long sys_getresgid16
563 .long sys_prctl
564 .long sys_rt_sigreturn
565 .long sys_rt_sigaction
566 .long sys_rt_sigprocmask /* 175 */
567 .long sys_rt_sigpending
568 .long sys_rt_sigtimedwait
569 .long sys_rt_sigqueueinfo
570 .long sys_rt_sigsuspend
571 .long sys_pread64 /* 180 */
572 .long sys_pwrite64
573 .long sys_chown16
574 .long sys_getcwd
575 .long sys_capget
576 .long sys_capset /* 185 */
577 .long sys_sigaltstack
578 .long sys_sendfile
579 .long sys_ni_syscall /* reserved for streams1 */
580 .long sys_ni_syscall /* reserved for streams2 */
581 .long sys_vfork /* 190 */
582 .long sys_getrlimit
583 .long sys_mmap2
584 .long sys_truncate64
585 .long sys_ftruncate64
586 .long sys_stat64 /* 195 */
587 .long sys_lstat64
588 .long sys_fstat64
589 .long sys_lchown
590 .long sys_getuid
591 .long sys_getgid /* 200 */
592 .long sys_geteuid
593 .long sys_getegid
594 .long sys_setreuid
595 .long sys_setregid
596 .long sys_getgroups /* 205 */
597 .long sys_setgroups
598 .long sys_fchown
599 .long sys_setresuid
600 .long sys_getresuid
601 .long sys_setresgid /* 210 */
602 .long sys_getresgid
603 .long sys_chown
604 .long sys_setuid
605 .long sys_setgid
606 .long sys_setfsuid /* 215 */
607 .long sys_setfsgid
608 .long sys_pivot_root
609 .long sys_mincore
610 .long sys_madvise
611 .long sys_getdents64 /* 220 */
612 .long sys_fcntl64
613 .long sys_ni_syscall /* reserved for TUX */
614 .long sys_ni_syscall
615 .long sys_gettid
616 .long sys_readahead /* 225 */
617 .long sys_setxattr
618 .long sys_lsetxattr
619 .long sys_fsetxattr
620 .long sys_getxattr
621 .long sys_lgetxattr /* 230 */
622 .long sys_fgetxattr
623 .long sys_listxattr
624 .long sys_llistxattr
625 .long sys_flistxattr
626 .long sys_removexattr /* 235 */
627 .long sys_lremovexattr
628 .long sys_fremovexattr
629 .long sys_tkill
630 .long sys_sendfile64
631 .long sys_futex /* 240 */
632 .long sys_sched_setaffinity
633 .long sys_sched_getaffinity
634 .long sys_ni_syscall /* sys_set_thread_area */
635 .long sys_ni_syscall /* sys_get_thread_area */
636 .long sys_io_setup /* 245 */
637 .long sys_io_destroy
638 .long sys_io_getevents
639 .long sys_io_submit
640 .long sys_io_cancel
641 .long sys_fadvise64 /* 250 */
642 .long sys_ni_syscall
643 .long sys_exit_group
644 .long sys_lookup_dcookie
645 .long sys_epoll_create
646 .long sys_epoll_ctl /* 255 */
647 .long sys_epoll_wait
648 .long sys_remap_file_pages
649 .long sys_set_tid_address
650 .long sys_timer_create
651 .long sys_timer_settime /* 260 */
652 .long sys_timer_gettime
653 .long sys_timer_getoverrun
654 .long sys_timer_delete
655 .long sys_clock_settime
656 .long sys_clock_gettime /* 265 */
657 .long sys_clock_getres
658 .long sys_clock_nanosleep
659 .long sys_statfs64
660 .long sys_fstatfs64
661 .long sys_tgkill /* 270 */
662 .long sys_utimes
663 .long sys_fadvise64_64
664 .long sys_ni_syscall /* sys_vserver */
665 .long sys_mbind
666 .long sys_get_mempolicy /* 275 */
667 .long sys_set_mempolicy
668 .long sys_mq_open
669 .long sys_mq_unlink
670 .long sys_mq_timedsend
671 .long sys_mq_timedreceive /* 280 */
672 .long sys_mq_notify
673 .long sys_mq_getsetattr
674 .long sys_kexec_load
675 .long sys_waitid
676 .long sys_ni_syscall /* 285 */ /* available */
677 .long sys_add_key
678 .long sys_request_key
679 .long sys_keyctl
680 .long sys_cacheflush
681 .long sys_ioprio_set /* 290 */
682 .long sys_ioprio_get
683 .long sys_inotify_init
684 .long sys_inotify_add_watch
685 .long sys_inotify_rm_watch
686 .long sys_migrate_pages /* 295 */
687 .long sys_openat
688 .long sys_mkdirat
689 .long sys_mknodat
690 .long sys_fchownat
691 .long sys_futimesat /* 300 */
692 .long sys_fstatat64
693 .long sys_unlinkat
694 .long sys_renameat
695 .long sys_linkat
696 .long sys_symlinkat /* 305 */
697 .long sys_readlinkat
698 .long sys_fchmodat
699 .long sys_faccessat
700 .long sys_pselect6
701 .long sys_ppoll /* 310 */
702 .long sys_unshare
703 .long sys_set_robust_list
704 .long sys_get_robust_list
705 .long sys_splice
706 .long sys_sync_file_range /* 315 */
707 .long sys_tee
708 .long sys_vmsplice
709 .long sys_move_pages
710 .long sys_getcpu
711 .long sys_epoll_pwait /* 320 */
712 .long sys_utimensat
713 .long sys_signalfd
714 .long sys_timerfd_create
715 .long sys_eventfd
716 .long sys_fallocate /* 325 */
717 .long sys_timerfd_settime
718 .long sys_timerfd_gettime
719
720
721nr_syscalls=(.-sys_call_table)/4
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 15:58:20 -0500