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Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/.
[deliverable/linux.git] / arch / mn10300 / kernel / entry.S
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b920de1b
DH		 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)
24646bd2 183 __cli
b920de1b
DH		 184 mov (TI_preempt_count,a2),d0 # non-zero preempt_count ?
185 cmp 0,d0
186 bne restore_all
187
188need_resched:
189 btst _TIF_NEED_RESCHED,(TI_flags,a2)
190 beq restore_all
191 mov (REG_EPSW,fp),d0
192 and EPSW_IM,d0
193 cmp EPSW_IM_7,d0 # interrupts off (exception path) ?
24646bd2 194 bne restore_all
b920de1b
DH		 195 call preempt_schedule_irq[],0
196 jmp need_resched
197#endif
198
199
200###############################################################################
201#
202# IRQ handler entry point
203# - intended to be entered at multiple priorities
204#
205###############################################################################
206ENTRY(irq_handler)
207 add -4,sp
208 SAVE_ALL
209
210 # it's not a syscall
211 mov 0xffffffff,d0
212 mov d0,(REG_ORIG_D0,fp)
213
214 mov fp,d0
215 call do_IRQ[],0 # do_IRQ(regs)
216
217 jmp ret_from_intr
218
219###############################################################################
220#
221# Monitor Signal handler entry point
222#
223###############################################################################
224ENTRY(monitor_signal)
225 movbu (0xae000001),d1
226 cmp 1,d1
227 beq monsignal
228 ret [],0
229
230monsignal:
231 or EPSW_NMID,epsw
232 mov d0,a0
233 mov a0,sp
234 mov (REG_EPSW,fp),d1
235 and ~EPSW_nSL,d1
236 mov d1,(REG_EPSW,fp)
237 movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
238 mov (sp),a1
239 mov a1,usp
240 movm (sp),[other]
241 add 4,sp
242here: jmp 0x8e000008-here+0x8e000008
243
244###############################################################################
245#
246# Double Fault handler entry point
247# - note that there will not be a stack, D0/A0 will hold EPSW/PC as were
248#
249###############################################################################
250 .section .bss
251 .balign THREAD_SIZE
252 .space THREAD_SIZE
253__df_stack:
254 .previous
255
256ENTRY(double_fault)
257 mov a0,(__df_stack-4) # PC as was
258 mov d0,(__df_stack-8) # EPSW as was
259 mn10300_set_dbfleds # display 'db-f' on the LEDs
260 mov 0xaa55aa55,d0
261 mov d0,(__df_stack-12) # no ORIG_D0
262 mov sp,a0 # save corrupted SP
263 mov __df_stack-12,sp # emergency supervisor stack
264 SAVE_ALL
265 mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got
266 # clobbered by the CPU)
267 mov fp,d0
268 calls do_double_fault
269double_fault_loop:
270 bra double_fault_loop
271
272###############################################################################
273#
274# Bus Error handler entry point
275# - handle external (async) bus errors separately
276#
277###############################################################################
278ENTRY(raw_bus_error)
279 add -4,sp
280 mov d0,(sp)
281 mov (BCBERR),d0 # what
282 btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error
283 beq __common_exception_aux # it wasn't
284
285 SAVE_ALL
286 mov (BCBEAR),d1 # destination of erroneous access
287
288 mov (REG_ORIG_D0,fp),d2
289 mov d2,(REG_D0,fp)
290 mov -1,d2
291 mov d2,(REG_ORIG_D0,fp)
292
293 add -4,sp
294 mov fp,(12,sp) # frame pointer
295 call io_bus_error[],0
296 jmp restore_all
297
298###############################################################################
299#
300# Miscellaneous exception entry points
301#
302###############################################################################
303ENTRY(nmi_handler)
304 add -4,sp
305 mov d0,(sp)
306 mov (TBR),d0
307 bra __common_exception_nonmi
308
309ENTRY(__common_exception)
310 add -4,sp
311 mov d0,(sp)
312
313__common_exception_aux:
314 mov (TBR),d0
315 and ~EPSW_NMID,epsw # turn NMIs back on if not NMI
316 or EPSW_IE,epsw
317
318__common_exception_nonmi:
319 and 0x0000FFFF,d0 # turn the exception code into a vector
320 # table index
321
322 btst 0x00000007,d0
323 bne 1f
324 cmp 0x00000400,d0
325 bge 1f
326
327 SAVE_ALL # build the stack frame
328
329 mov (REG_D0,fp),a2 # get the exception number
330 mov (REG_ORIG_D0,fp),d0
331 mov d0,(REG_D0,fp)
332 mov -1,d0
333 mov d0,(REG_ORIG_D0,fp)
334
335#ifdef CONFIG_GDBSTUB
336 btst 0x01,(gdbstub_busy)
337 beq 2f
338 and ~EPSW_IE,epsw
339 mov fp,d0
340 mov a2,d1
341 call gdbstub_exception[],0 # gdbstub itself caused an exception
342 bra restore_all
3432:
344#endif
345
346 mov fp,d0 # arg 0: stacked register file
347 mov a2,d1 # arg 1: exception number
348 lsr 1,a2
349
350 mov (exception_table,a2),a2
351 calls (a2)
352 jmp ret_from_exception
353
3541: pi # BUG() equivalent
355
356###############################################################################
357#
358# Exception handler functions table
359#
360###############################################################################
361 .data
362ENTRY(exception_table)
363 .rept 0x400>>1
364 .long uninitialised_exception
365 .endr
366 .previous
367
368###############################################################################
369#
370# Change an entry in the exception table
371# - D0 exception code, D1 handler
372#
373###############################################################################
374ENTRY(set_excp_vector)
375 lsr 1,d0
376 add exception_table,d0
377 mov d1,(d0)
378 mov 4,d1
379#if defined(CONFIG_MN10300_CACHE_WBACK)
380 jmp mn10300_dcache_flush_inv_range2
381#else
382 ret [],0
383#endif
384
385###############################################################################
386#
387# System call table
388#
389###############################################################################
390 .data
391ENTRY(sys_call_table)
392 .long sys_restart_syscall /* 0 */
393 .long sys_exit
394 .long sys_fork
395 .long sys_read
396 .long sys_write
397 .long sys_open /* 5 */
398 .long sys_close
399 .long sys_waitpid
400 .long sys_creat
401 .long sys_link
402 .long sys_unlink /* 10 */
403 .long sys_execve
404 .long sys_chdir
405 .long sys_time
406 .long sys_mknod
407 .long sys_chmod /* 15 */
408 .long sys_lchown16
409 .long sys_ni_syscall /* old break syscall holder */
410 .long sys_stat
411 .long sys_lseek
412 .long sys_getpid /* 20 */
413 .long sys_mount
414 .long sys_oldumount
415 .long sys_setuid16
416 .long sys_getuid16
417 .long sys_stime /* 25 */
418 .long sys_ptrace
419 .long sys_alarm
420 .long sys_fstat
421 .long sys_pause
422 .long sys_utime /* 30 */
423 .long sys_ni_syscall /* old stty syscall holder */
424 .long sys_ni_syscall /* old gtty syscall holder */
425 .long sys_access
426 .long sys_nice
427 .long sys_ni_syscall /* 35 - old ftime syscall holder */
428 .long sys_sync
429 .long sys_kill
430 .long sys_rename
431 .long sys_mkdir
432 .long sys_rmdir /* 40 */
433 .long sys_dup
434 .long sys_pipe
435 .long sys_times
436 .long sys_ni_syscall /* old prof syscall holder */
437 .long sys_brk /* 45 */
438 .long sys_setgid16
439 .long sys_getgid16
440 .long sys_signal
441 .long sys_geteuid16
442 .long sys_getegid16 /* 50 */
443 .long sys_acct
444 .long sys_umount /* recycled never used phys() */
445 .long sys_ni_syscall /* old lock syscall holder */
446 .long sys_ioctl
447 .long sys_fcntl /* 55 */
448 .long sys_ni_syscall /* old mpx syscall holder */
449 .long sys_setpgid
450 .long sys_ni_syscall /* old ulimit syscall holder */
451 .long sys_ni_syscall /* old sys_olduname */
452 .long sys_umask /* 60 */
453 .long sys_chroot
454 .long sys_ustat
455 .long sys_dup2
456 .long sys_getppid
457 .long sys_getpgrp /* 65 */
458 .long sys_setsid
459 .long sys_sigaction
460 .long sys_sgetmask
461 .long sys_ssetmask
462 .long sys_setreuid16 /* 70 */
463 .long sys_setregid16
464 .long sys_sigsuspend
465 .long sys_sigpending
466 .long sys_sethostname
467 .long sys_setrlimit /* 75 */
468 .long sys_old_getrlimit
469 .long sys_getrusage
470 .long sys_gettimeofday
471 .long sys_settimeofday
472 .long sys_getgroups16 /* 80 */
473 .long sys_setgroups16
474 .long old_select
475 .long sys_symlink
476 .long sys_lstat
477 .long sys_readlink /* 85 */
478 .long sys_uselib
479 .long sys_swapon
480 .long sys_reboot
e55380ed 481 .long sys_old_readdir
b920de1b
DH		 482 .long old_mmap /* 90 */
483 .long sys_munmap
484 .long sys_truncate
485 .long sys_ftruncate
486 .long sys_fchmod
487 .long sys_fchown16 /* 95 */
488 .long sys_getpriority
489 .long sys_setpriority
490 .long sys_ni_syscall /* old profil syscall holder */
491 .long sys_statfs
492 .long sys_fstatfs /* 100 */
493 .long sys_ni_syscall /* ioperm */
494 .long sys_socketcall
495 .long sys_syslog
496 .long sys_setitimer
497 .long sys_getitimer /* 105 */
498 .long sys_newstat
499 .long sys_newlstat
500 .long sys_newfstat
501 .long sys_ni_syscall /* old sys_uname */
502 .long sys_ni_syscall /* 110 - iopl */
503 .long sys_vhangup
504 .long sys_ni_syscall /* old "idle" system call */
505 .long sys_ni_syscall /* vm86old */
506 .long sys_wait4
507 .long sys_swapoff /* 115 */
508 .long sys_sysinfo
509 .long sys_ipc
510 .long sys_fsync
511 .long sys_sigreturn
512 .long sys_clone /* 120 */
513 .long sys_setdomainname
514 .long sys_newuname
515 .long sys_ni_syscall /* modify_ldt */
516 .long sys_adjtimex
517 .long sys_mprotect /* 125 */
518 .long sys_sigprocmask
519 .long sys_ni_syscall /* old "create_module" */
520 .long sys_init_module
521 .long sys_delete_module
522 .long sys_ni_syscall /* 130: old "get_kernel_syms" */
523 .long sys_quotactl
524 .long sys_getpgid
525 .long sys_fchdir
526 .long sys_bdflush
527 .long sys_sysfs /* 135 */
528 .long sys_personality
529 .long sys_ni_syscall /* reserved for afs_syscall */
530 .long sys_setfsuid16
531 .long sys_setfsgid16
532 .long sys_llseek /* 140 */
533 .long sys_getdents
534 .long sys_select
535 .long sys_flock
536 .long sys_msync
537 .long sys_readv /* 145 */
538 .long sys_writev
539 .long sys_getsid
540 .long sys_fdatasync
541 .long sys_sysctl
542 .long sys_mlock /* 150 */
543 .long sys_munlock
544 .long sys_mlockall
545 .long sys_munlockall
546 .long sys_sched_setparam
547 .long sys_sched_getparam /* 155 */
548 .long sys_sched_setscheduler
549 .long sys_sched_getscheduler
550 .long sys_sched_yield
551 .long sys_sched_get_priority_max
552 .long sys_sched_get_priority_min /* 160 */
553 .long sys_sched_rr_get_interval
554 .long sys_nanosleep
555 .long sys_mremap
556 .long sys_setresuid16
557 .long sys_getresuid16 /* 165 */
558 .long sys_ni_syscall /* vm86 */
559 .long sys_ni_syscall /* Old sys_query_module */
560 .long sys_poll
561 .long sys_nfsservctl
562 .long sys_setresgid16 /* 170 */
563 .long sys_getresgid16
564 .long sys_prctl
565 .long sys_rt_sigreturn
566 .long sys_rt_sigaction
567 .long sys_rt_sigprocmask /* 175 */
568 .long sys_rt_sigpending
569 .long sys_rt_sigtimedwait
570 .long sys_rt_sigqueueinfo
571 .long sys_rt_sigsuspend
572 .long sys_pread64 /* 180 */
573 .long sys_pwrite64
574 .long sys_chown16
575 .long sys_getcwd
576 .long sys_capget
577 .long sys_capset /* 185 */
578 .long sys_sigaltstack
579 .long sys_sendfile
580 .long sys_ni_syscall /* reserved for streams1 */
581 .long sys_ni_syscall /* reserved for streams2 */
582 .long sys_vfork /* 190 */
583 .long sys_getrlimit
584 .long sys_mmap2
585 .long sys_truncate64
586 .long sys_ftruncate64
587 .long sys_stat64 /* 195 */
588 .long sys_lstat64
589 .long sys_fstat64
590 .long sys_lchown
591 .long sys_getuid
592 .long sys_getgid /* 200 */
593 .long sys_geteuid
594 .long sys_getegid
595 .long sys_setreuid
596 .long sys_setregid
597 .long sys_getgroups /* 205 */
598 .long sys_setgroups
599 .long sys_fchown
600 .long sys_setresuid
601 .long sys_getresuid
602 .long sys_setresgid /* 210 */
603 .long sys_getresgid
604 .long sys_chown
605 .long sys_setuid
606 .long sys_setgid
607 .long sys_setfsuid /* 215 */
608 .long sys_setfsgid
609 .long sys_pivot_root
610 .long sys_mincore
611 .long sys_madvise
612 .long sys_getdents64 /* 220 */
613 .long sys_fcntl64
614 .long sys_ni_syscall /* reserved for TUX */
615 .long sys_ni_syscall
616 .long sys_gettid
617 .long sys_readahead /* 225 */
618 .long sys_setxattr
619 .long sys_lsetxattr
620 .long sys_fsetxattr
621 .long sys_getxattr
622 .long sys_lgetxattr /* 230 */
623 .long sys_fgetxattr
624 .long sys_listxattr
625 .long sys_llistxattr
626 .long sys_flistxattr
627 .long sys_removexattr /* 235 */
628 .long sys_lremovexattr
629 .long sys_fremovexattr
630 .long sys_tkill
631 .long sys_sendfile64
632 .long sys_futex /* 240 */
633 .long sys_sched_setaffinity
634 .long sys_sched_getaffinity
635 .long sys_ni_syscall /* sys_set_thread_area */
636 .long sys_ni_syscall /* sys_get_thread_area */
637 .long sys_io_setup /* 245 */
638 .long sys_io_destroy
639 .long sys_io_getevents
640 .long sys_io_submit
641 .long sys_io_cancel
642 .long sys_fadvise64 /* 250 */
643 .long sys_ni_syscall
644 .long sys_exit_group
645 .long sys_lookup_dcookie
646 .long sys_epoll_create
647 .long sys_epoll_ctl /* 255 */
648 .long sys_epoll_wait
649 .long sys_remap_file_pages
650 .long sys_set_tid_address
651 .long sys_timer_create
652 .long sys_timer_settime /* 260 */
653 .long sys_timer_gettime
654 .long sys_timer_getoverrun
655 .long sys_timer_delete
656 .long sys_clock_settime
657 .long sys_clock_gettime /* 265 */
658 .long sys_clock_getres
659 .long sys_clock_nanosleep
660 .long sys_statfs64
661 .long sys_fstatfs64
662 .long sys_tgkill /* 270 */
663 .long sys_utimes
664 .long sys_fadvise64_64
665 .long sys_ni_syscall /* sys_vserver */
666 .long sys_mbind
667 .long sys_get_mempolicy /* 275 */
668 .long sys_set_mempolicy
669 .long sys_mq_open
670 .long sys_mq_unlink
671 .long sys_mq_timedsend
672 .long sys_mq_timedreceive /* 280 */
673 .long sys_mq_notify
674 .long sys_mq_getsetattr
675 .long sys_kexec_load
676 .long sys_waitid
677 .long sys_ni_syscall /* 285 */ /* available */
678 .long sys_add_key
679 .long sys_request_key
680 .long sys_keyctl
681 .long sys_cacheflush
682 .long sys_ioprio_set /* 290 */
683 .long sys_ioprio_get
684 .long sys_inotify_init
685 .long sys_inotify_add_watch
686 .long sys_inotify_rm_watch
687 .long sys_migrate_pages /* 295 */
688 .long sys_openat
689 .long sys_mkdirat
690 .long sys_mknodat
691 .long sys_fchownat
692 .long sys_futimesat /* 300 */
693 .long sys_fstatat64
694 .long sys_unlinkat
695 .long sys_renameat
696 .long sys_linkat
697 .long sys_symlinkat /* 305 */
698 .long sys_readlinkat
699 .long sys_fchmodat
700 .long sys_faccessat
701 .long sys_pselect6
702 .long sys_ppoll /* 310 */
703 .long sys_unshare
704 .long sys_set_robust_list
705 .long sys_get_robust_list
706 .long sys_splice
707 .long sys_sync_file_range /* 315 */
708 .long sys_tee
709 .long sys_vmsplice
710 .long sys_move_pages
711 .long sys_getcpu
712 .long sys_epoll_pwait /* 320 */
713 .long sys_utimensat
714 .long sys_signalfd
715 .long sys_timerfd_create
716 .long sys_eventfd
717 .long sys_fallocate /* 325 */
718 .long sys_timerfd_settime
719 .long sys_timerfd_gettime
02c36380
DH		 720 .long sys_signalfd4
721 .long sys_eventfd2
722 .long sys_epoll_create1 /* 330 */
723 .long sys_dup3
724 .long sys_pipe2
725 .long sys_inotify_init1
b920de1b
DH		 726
727
728nr_syscalls=(.-sys_call_table)/4
Linux kernel - Deliverables
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