| blob | a94e7ea3faa69e634f50b4e7d2db6db0916b7a2f |
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 <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>
30 #ifdef CONFIG_PREEMPT
31 #define preempt_stop __cli
32 #else
33 #define preempt_stop
34 #define resume_kernel restore_all
35 #endif
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
49 .am33_2
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 ###############################################################################
57 ENTRY(ret_from_fork)
58 call schedule_tail[],0
59 GET_THREAD_INFO a2
61 # return 0 to indicate child process
62 clr d0
63 mov d0,(REG_D0,fp)
64 jmp syscall_exit
66 ###############################################################################
67 #
68 # system call handler
69 #
70 ###############################################################################
71 ENTRY(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_entry_trace
80 syscall_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)
87 syscall_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
94 restore_all:
95 RESTORE_ALL
97 ###############################################################################
98 #
99 # perform work that needs to be done immediately before resumption and syscall
100 # tracing
101 #
102 ###############################################################################
103 ALIGN
104 syscall_exit_work:
105 btst _TIF_SYSCALL_TRACE,d2
106 beq work_pending
107 __sti # could let syscall_trace_exit() call
108 # schedule() instead
109 mov fp,d0
110 call syscall_trace_exit[],0 # do_syscall_trace(regs)
111 jmp resume_userspace
113 ALIGN
114 work_pending:
115 btst _TIF_NEED_RESCHED,d2
116 beq work_notifysig
118 work_resched:
119 call schedule[],0
121 # make sure we don't miss an interrupt setting need_resched or
122 # sigpending between sampling and the rti
123 __cli
125 # is there any work to be done other than syscall tracing?
126 mov (TI_flags,a2),d2
127 btst _TIF_WORK_MASK,d2
128 beq restore_all
129 btst _TIF_NEED_RESCHED,d2
130 bne work_resched
132 # deal with pending signals and notify-resume requests
133 work_notifysig:
134 mov fp,d0
135 mov d2,d1
136 call do_notify_resume[],0
137 jmp resume_userspace
139 # perform syscall entry tracing
140 syscall_entry_trace:
141 mov -ENOSYS,d0
142 mov d0,(REG_D0,fp)
143 mov fp,d0
144 call syscall_trace_entry[],0 # returns the syscall number to actually use
145 mov (REG_D1,fp),d1
146 cmp nr_syscalls,d0
147 bcs syscall_call
148 jmp syscall_exit
150 syscall_badsys:
151 mov -ENOSYS,d0
152 mov d0,(REG_D0,fp)
153 jmp resume_userspace
155 # userspace resumption stub bypassing syscall exit tracing
156 .globl ret_from_exception, ret_from_intr
157 ALIGN
158 ret_from_exception:
159 preempt_stop
160 ret_from_intr:
161 GET_THREAD_INFO a2
162 mov (REG_EPSW,fp),d0 # need to deliver signals before
163 # returning to userspace
164 and EPSW_nSL,d0
165 beq resume_kernel # returning to supervisor mode
167 ENTRY(resume_userspace)
168 # make sure we don't miss an interrupt setting need_resched or
169 # sigpending between sampling and the rti
170 __cli
172 # is there any work to be done on int/exception return?
173 mov (TI_flags,a2),d2
174 btst _TIF_WORK_MASK,d2
175 bne work_pending
176 jmp restore_all
178 #ifdef CONFIG_PREEMPT
179 ENTRY(resume_kernel)
180 __cli
181 mov (TI_preempt_count,a2),d0 # non-zero preempt_count ?
182 cmp 0,d0
183 bne restore_all
185 need_resched:
186 btst _TIF_NEED_RESCHED,(TI_flags,a2)
187 beq restore_all
188 mov (REG_EPSW,fp),d0
189 and EPSW_IM,d0
190 cmp EPSW_IM_7,d0 # interrupts off (exception path) ?
191 bne restore_all
192 call preempt_schedule_irq[],0
193 jmp need_resched
194 #endif
197 ###############################################################################
198 #
199 # IRQ handler entry point
200 # - intended to be entered at multiple priorities
201 #
202 ###############################################################################
203 ENTRY(irq_handler)
204 add -4,sp
205 SAVE_ALL
207 # it's not a syscall
208 mov 0xffffffff,d0
209 mov d0,(REG_ORIG_D0,fp)
211 mov fp,d0
212 call do_IRQ[],0 # do_IRQ(regs)
214 jmp ret_from_intr
216 ###############################################################################
217 #
218 # Monitor Signal handler entry point
219 #
220 ###############################################################################
221 ENTRY(monitor_signal)
222 movbu (0xae000001),d1
223 cmp 1,d1
224 beq monsignal
225 ret [],0
227 monsignal:
228 or EPSW_NMID,epsw
229 mov d0,a0
230 mov a0,sp
231 mov (REG_EPSW,fp),d1
232 and ~EPSW_nSL,d1
233 mov d1,(REG_EPSW,fp)
234 movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
235 mov (sp),a1
236 mov a1,usp
237 movm (sp),[other]
238 add 4,sp
239 here: jmp 0x8e000008-here+0x8e000008
241 ###############################################################################
242 #
243 # Double Fault handler entry point
244 # - note that there will not be a stack, D0/A0 will hold EPSW/PC as were
245 #
246 ###############################################################################
247 .section .bss
248 .balign THREAD_SIZE
249 .space THREAD_SIZE
250 __df_stack:
251 .previous
253 ENTRY(double_fault)
254 mov a0,(__df_stack-4) # PC as was
255 mov d0,(__df_stack-8) # EPSW as was
256 mn10300_set_dbfleds # display 'db-f' on the LEDs
257 mov 0xaa55aa55,d0
258 mov d0,(__df_stack-12) # no ORIG_D0
259 mov sp,a0 # save corrupted SP
260 mov __df_stack-12,sp # emergency supervisor stack
261 SAVE_ALL
262 mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got
263 # clobbered by the CPU)
264 mov fp,d0
265 calls do_double_fault
266 double_fault_loop:
267 bra double_fault_loop
269 ###############################################################################
270 #
271 # Bus Error handler entry point
272 # - handle external (async) bus errors separately
273 #
274 ###############################################################################
275 ENTRY(raw_bus_error)
276 add -4,sp
277 mov d0,(sp)
278 mov (BCBERR),d0 # what
279 btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error
280 beq __common_exception_aux # it wasn't
282 SAVE_ALL
283 mov (BCBEAR),d1 # destination of erroneous access
285 mov (REG_ORIG_D0,fp),d2
286 mov d2,(REG_D0,fp)
287 mov -1,d2
288 mov d2,(REG_ORIG_D0,fp)
290 add -4,sp
291 mov fp,(12,sp) # frame pointer
292 call io_bus_error[],0
293 jmp restore_all
295 ###############################################################################
296 #
297 # Miscellaneous exception entry points
298 #
299 ###############################################################################
300 ENTRY(nmi_handler)
301 add -4,sp
302 mov d0,(sp)
303 mov (TBR),d0
304 bra __common_exception_nonmi
306 ENTRY(__common_exception)
307 add -4,sp
308 mov d0,(sp)
310 __common_exception_aux:
311 mov (TBR),d0
312 and ~EPSW_NMID,epsw # turn NMIs back on if not NMI
313 or EPSW_IE,epsw
315 __common_exception_nonmi:
316 and 0x0000FFFF,d0 # turn the exception code into a vector
317 # table index
319 btst 0x00000007,d0
320 bne 1f
321 cmp 0x00000400,d0
322 bge 1f
324 SAVE_ALL # build the stack frame
326 mov (REG_D0,fp),a2 # get the exception number
327 mov (REG_ORIG_D0,fp),d0
328 mov d0,(REG_D0,fp)
329 mov -1,d0
330 mov d0,(REG_ORIG_D0,fp)
332 #ifdef CONFIG_GDBSTUB
333 btst 0x01,(gdbstub_busy)
334 beq 2f
335 and ~EPSW_IE,epsw
336 mov fp,d0
337 mov a2,d1
338 call gdbstub_exception[],0 # gdbstub itself caused an exception
339 bra restore_all
340 2:
341 #endif
343 mov fp,d0 # arg 0: stacked register file
344 mov a2,d1 # arg 1: exception number
345 lsr 1,a2
347 mov (exception_table,a2),a2
348 calls (a2)
349 jmp ret_from_exception
351 1: pi # BUG() equivalent
353 ###############################################################################
354 #
355 # Exception handler functions table
356 #
357 ###############################################################################
358 .data
359 ENTRY(exception_table)
360 .rept 0x400>>1
361 .long uninitialised_exception
362 .endr
363 .previous
365 ###############################################################################
366 #
367 # Change an entry in the exception table
368 # - D0 exception code, D1 handler
369 #
370 ###############################################################################
371 ENTRY(set_excp_vector)
372 lsr 1,d0
373 add exception_table,d0
374 mov d1,(d0)
375 mov 4,d1
376 #if defined(CONFIG_MN10300_CACHE_WBACK)
377 jmp mn10300_dcache_flush_inv_range2
378 #else
379 ret [],0
380 #endif
382 ###############################################################################
383 #
384 # System call table
385 #
386 ###############################################################################
387 .data
388 ENTRY(sys_call_table)
389 .long sys_restart_syscall /* 0 */
390 .long sys_exit
391 .long sys_fork
392 .long sys_read
393 .long sys_write
394 .long sys_open /* 5 */
395 .long sys_close
396 .long sys_waitpid
397 .long sys_creat
398 .long sys_link
399 .long sys_unlink /* 10 */
400 .long sys_execve
401 .long sys_chdir
402 .long sys_time
403 .long sys_mknod
404 .long sys_chmod /* 15 */
405 .long sys_lchown16
406 .long sys_ni_syscall /* old break syscall holder */
407 .long sys_stat
408 .long sys_lseek
409 .long sys_getpid /* 20 */
410 .long sys_mount
411 .long sys_oldumount
412 .long sys_setuid16
413 .long sys_getuid16
414 .long sys_stime /* 25 */
415 .long sys_ptrace
416 .long sys_alarm
417 .long sys_fstat
418 .long sys_pause
419 .long sys_utime /* 30 */
420 .long sys_ni_syscall /* old stty syscall holder */
421 .long sys_ni_syscall /* old gtty syscall holder */
422 .long sys_access
423 .long sys_nice
424 .long sys_ni_syscall /* 35 - old ftime syscall holder */
425 .long sys_sync
426 .long sys_kill
427 .long sys_rename
428 .long sys_mkdir
429 .long sys_rmdir /* 40 */
430 .long sys_dup
431 .long sys_pipe
432 .long sys_times
433 .long sys_ni_syscall /* old prof syscall holder */
434 .long sys_brk /* 45 */
435 .long sys_setgid16
436 .long sys_getgid16
437 .long sys_signal
438 .long sys_geteuid16
439 .long sys_getegid16 /* 50 */
440 .long sys_acct
441 .long sys_umount /* recycled never used phys() */
442 .long sys_ni_syscall /* old lock syscall holder */
443 .long sys_ioctl
444 .long sys_fcntl /* 55 */
445 .long sys_ni_syscall /* old mpx syscall holder */
446 .long sys_setpgid
447 .long sys_ni_syscall /* old ulimit syscall holder */
448 .long sys_ni_syscall /* old sys_olduname */
449 .long sys_umask /* 60 */
450 .long sys_chroot
451 .long sys_ustat
452 .long sys_dup2
453 .long sys_getppid
454 .long sys_getpgrp /* 65 */
455 .long sys_setsid
456 .long sys_sigaction
457 .long sys_sgetmask
458 .long sys_ssetmask
459 .long sys_setreuid16 /* 70 */
460 .long sys_setregid16
461 .long sys_sigsuspend
462 .long sys_sigpending
463 .long sys_sethostname
464 .long sys_setrlimit /* 75 */
465 .long sys_old_getrlimit
466 .long sys_getrusage
467 .long sys_gettimeofday
468 .long sys_settimeofday
469 .long sys_getgroups16 /* 80 */
470 .long sys_setgroups16
471 .long old_select
472 .long sys_symlink
473 .long sys_lstat
474 .long sys_readlink /* 85 */
475 .long sys_uselib
476 .long sys_swapon
477 .long sys_reboot
478 .long sys_old_readdir
479 .long old_mmap /* 90 */
480 .long sys_munmap
481 .long sys_truncate
482 .long sys_ftruncate
483 .long sys_fchmod
484 .long sys_fchown16 /* 95 */
485 .long sys_getpriority
486 .long sys_setpriority
487 .long sys_ni_syscall /* old profil syscall holder */
488 .long sys_statfs
489 .long sys_fstatfs /* 100 */
490 .long sys_ni_syscall /* ioperm */
491 .long sys_socketcall
492 .long sys_syslog
493 .long sys_setitimer
494 .long sys_getitimer /* 105 */
495 .long sys_newstat
496 .long sys_newlstat
497 .long sys_newfstat
498 .long sys_ni_syscall /* old sys_uname */
499 .long sys_ni_syscall /* 110 - iopl */
500 .long sys_vhangup
501 .long sys_ni_syscall /* old "idle" system call */
502 .long sys_ni_syscall /* vm86old */
503 .long sys_wait4
504 .long sys_swapoff /* 115 */
505 .long sys_sysinfo
506 .long sys_ipc
507 .long sys_fsync
508 .long sys_sigreturn
509 .long sys_clone /* 120 */
510 .long sys_setdomainname
511 .long sys_newuname
512 .long sys_ni_syscall /* modify_ldt */
513 .long sys_adjtimex
514 .long sys_mprotect /* 125 */
515 .long sys_sigprocmask
516 .long sys_ni_syscall /* old "create_module" */
517 .long sys_init_module
518 .long sys_delete_module
519 .long sys_ni_syscall /* 130: old "get_kernel_syms" */
520 .long sys_quotactl
521 .long sys_getpgid
522 .long sys_fchdir
523 .long sys_bdflush
524 .long sys_sysfs /* 135 */
525 .long sys_personality
526 .long sys_ni_syscall /* reserved for afs_syscall */
527 .long sys_setfsuid16
528 .long sys_setfsgid16
529 .long sys_llseek /* 140 */
530 .long sys_getdents
531 .long sys_select
532 .long sys_flock
533 .long sys_msync
534 .long sys_readv /* 145 */
535 .long sys_writev
536 .long sys_getsid
537 .long sys_fdatasync
538 .long sys_sysctl
539 .long sys_mlock /* 150 */
540 .long sys_munlock
541 .long sys_mlockall
542 .long sys_munlockall
543 .long sys_sched_setparam
544 .long sys_sched_getparam /* 155 */
545 .long sys_sched_setscheduler
546 .long sys_sched_getscheduler
547 .long sys_sched_yield
548 .long sys_sched_get_priority_max
549 .long sys_sched_get_priority_min /* 160 */
550 .long sys_sched_rr_get_interval
551 .long sys_nanosleep
552 .long sys_mremap
553 .long sys_setresuid16
554 .long sys_getresuid16 /* 165 */
555 .long sys_ni_syscall /* vm86 */
556 .long sys_ni_syscall /* Old sys_query_module */
557 .long sys_poll
558 .long sys_nfsservctl
559 .long sys_setresgid16 /* 170 */
560 .long sys_getresgid16
561 .long sys_prctl
562 .long sys_rt_sigreturn
563 .long sys_rt_sigaction
564 .long sys_rt_sigprocmask /* 175 */
565 .long sys_rt_sigpending
566 .long sys_rt_sigtimedwait
567 .long sys_rt_sigqueueinfo
568 .long sys_rt_sigsuspend
569 .long sys_pread64 /* 180 */
570 .long sys_pwrite64
571 .long sys_chown16
572 .long sys_getcwd
573 .long sys_capget
574 .long sys_capset /* 185 */
575 .long sys_sigaltstack
576 .long sys_sendfile
577 .long sys_ni_syscall /* reserved for streams1 */
578 .long sys_ni_syscall /* reserved for streams2 */
579 .long sys_vfork /* 190 */
580 .long sys_getrlimit
581 .long sys_mmap2
582 .long sys_truncate64
583 .long sys_ftruncate64
584 .long sys_stat64 /* 195 */
585 .long sys_lstat64
586 .long sys_fstat64
587 .long sys_lchown
588 .long sys_getuid
589 .long sys_getgid /* 200 */
590 .long sys_geteuid
591 .long sys_getegid
592 .long sys_setreuid
593 .long sys_setregid
594 .long sys_getgroups /* 205 */
595 .long sys_setgroups
596 .long sys_fchown
597 .long sys_setresuid
598 .long sys_getresuid
599 .long sys_setresgid /* 210 */
600 .long sys_getresgid
601 .long sys_chown
602 .long sys_setuid
603 .long sys_setgid
604 .long sys_setfsuid /* 215 */
605 .long sys_setfsgid
606 .long sys_pivot_root
607 .long sys_mincore
608 .long sys_madvise
609 .long sys_getdents64 /* 220 */
610 .long sys_fcntl64
611 .long sys_ni_syscall /* reserved for TUX */
612 .long sys_ni_syscall
613 .long sys_gettid
614 .long sys_readahead /* 225 */
615 .long sys_setxattr
616 .long sys_lsetxattr
617 .long sys_fsetxattr
618 .long sys_getxattr
619 .long sys_lgetxattr /* 230 */
620 .long sys_fgetxattr
621 .long sys_listxattr
622 .long sys_llistxattr
623 .long sys_flistxattr
624 .long sys_removexattr /* 235 */
625 .long sys_lremovexattr
626 .long sys_fremovexattr
627 .long sys_tkill
628 .long sys_sendfile64
629 .long sys_futex /* 240 */
630 .long sys_sched_setaffinity
631 .long sys_sched_getaffinity
632 .long sys_ni_syscall /* sys_set_thread_area */
633 .long sys_ni_syscall /* sys_get_thread_area */
634 .long sys_io_setup /* 245 */
635 .long sys_io_destroy
636 .long sys_io_getevents
637 .long sys_io_submit
638 .long sys_io_cancel
639 .long sys_fadvise64 /* 250 */
640 .long sys_ni_syscall
641 .long sys_exit_group
642 .long sys_lookup_dcookie
643 .long sys_epoll_create
644 .long sys_epoll_ctl /* 255 */
645 .long sys_epoll_wait
646 .long sys_remap_file_pages
647 .long sys_set_tid_address
648 .long sys_timer_create
649 .long sys_timer_settime /* 260 */
650 .long sys_timer_gettime
651 .long sys_timer_getoverrun
652 .long sys_timer_delete
653 .long sys_clock_settime
654 .long sys_clock_gettime /* 265 */
655 .long sys_clock_getres
656 .long sys_clock_nanosleep
657 .long sys_statfs64
658 .long sys_fstatfs64
659 .long sys_tgkill /* 270 */
660 .long sys_utimes
661 .long sys_fadvise64_64
662 .long sys_ni_syscall /* sys_vserver */
663 .long sys_mbind
664 .long sys_get_mempolicy /* 275 */
665 .long sys_set_mempolicy
666 .long sys_mq_open
667 .long sys_mq_unlink
668 .long sys_mq_timedsend
669 .long sys_mq_timedreceive /* 280 */
670 .long sys_mq_notify
671 .long sys_mq_getsetattr
672 .long sys_kexec_load
673 .long sys_waitid
674 .long sys_ni_syscall /* 285 */ /* available */
675 .long sys_add_key
676 .long sys_request_key
677 .long sys_keyctl
678 .long sys_cacheflush
679 .long sys_ioprio_set /* 290 */
680 .long sys_ioprio_get
681 .long sys_inotify_init
682 .long sys_inotify_add_watch
683 .long sys_inotify_rm_watch
684 .long sys_migrate_pages /* 295 */
685 .long sys_openat
686 .long sys_mkdirat
687 .long sys_mknodat
688 .long sys_fchownat
689 .long sys_futimesat /* 300 */
690 .long sys_fstatat64
691 .long sys_unlinkat
692 .long sys_renameat
693 .long sys_linkat
694 .long sys_symlinkat /* 305 */
695 .long sys_readlinkat
696 .long sys_fchmodat
697 .long sys_faccessat
698 .long sys_pselect6
699 .long sys_ppoll /* 310 */
700 .long sys_unshare
701 .long sys_set_robust_list
702 .long sys_get_robust_list
703 .long sys_splice
704 .long sys_sync_file_range /* 315 */
705 .long sys_tee
706 .long sys_vmsplice
707 .long sys_move_pages
708 .long sys_getcpu
709 .long sys_epoll_pwait /* 320 */
710 .long sys_utimensat
711 .long sys_signalfd
712 .long sys_timerfd_create
713 .long sys_eventfd
714 .long sys_fallocate /* 325 */
715 .long sys_timerfd_settime
716 .long sys_timerfd_gettime
717 .long sys_signalfd4
718 .long sys_eventfd2
719 .long sys_epoll_create1 /* 330 */
720 .long sys_dup3
721 .long sys_pipe2
722 .long sys_inotify_init1
723 .long sys_preadv
724 .long sys_pwritev /* 335 */
725 .long sys_rt_tgsigqueueinfo
726 .long sys_perf_event_open
729 nr_syscalls=(.-sys_call_table)/4