1 ###############################################################################
3 # MN10300 Exception and interrupt entry points
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)
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.
14 ###############################################################################
15 #include <linux/sys.h>
16 #include <linux/linkage.h>
18 #include <asm/system.h>
19 #include <asm/irqflags.h>
20 #include <asm/thread_info.h>
21 #include <asm/intctl-regs.h>
22 #include <asm/busctl-regs.h>
23 #include <asm/timer-regs.h>
24 #include <unit/leds.h>
26 #include <asm/pgtable.h>
27 #include <asm/errno.h>
28 #include <asm/asm-offsets.h>
29 #include <asm/frame.inc>
32 #define preempt_stop __cli
35 #define resume_kernel restore_all
40 or EPSW_IE|MN10300_CLI_LEVEL,epsw
46 or EPSW_IE|EPSW_IM_7,epsw
52 ###############################################################################
54 # the return path for a forked child
55 # - on entry, D0 holds the address of the previous task to run
57 ###############################################################################
59 call schedule_tail[],0
62 # return 0 to indicate child process
67 ###############################################################################
71 ###############################################################################
75 mov d0,(REG_ORIG_D0,fp)
79 btst _TIF_SYSCALL_TRACE,(TI_flags,a2)
80 bne syscall_entry_trace
85 mov (sys_call_table,a1),a0
89 # make sure we don't miss an interrupt setting need_resched or
90 # sigpending between sampling and the rti
93 btst _TIF_ALLWORK_MASK,d2
98 ###############################################################################
100 # perform work that needs to be done immediately before resumption and syscall
103 ###############################################################################
106 btst _TIF_SYSCALL_TRACE,d2
108 __sti # could let syscall_trace_exit() call
111 call syscall_trace_exit[],0 # do_syscall_trace(regs)
116 btst _TIF_NEED_RESCHED,d2
122 # make sure we don't miss an interrupt setting need_resched or
123 # sigpending between sampling and the rti
126 # is there any work to be done other than syscall tracing?
128 btst _TIF_WORK_MASK,d2
130 btst _TIF_NEED_RESCHED,d2
133 # deal with pending signals and notify-resume requests
137 call do_notify_resume[],0
140 # perform syscall entry tracing
145 call syscall_trace_entry[],0 # returns the syscall number to actually use
156 # userspace resumption stub bypassing syscall exit tracing
157 .globl ret_from_exception, ret_from_intr
163 mov (REG_EPSW,fp),d0 # need to deliver signals before
164 # returning to userspace
166 beq resume_kernel # returning to supervisor mode
168 ENTRY(resume_userspace)
169 # make sure we don't miss an interrupt setting need_resched or
170 # sigpending between sampling and the rti
173 # is there any work to be done on int/exception return?
175 btst _TIF_WORK_MASK,d2
179 #ifdef CONFIG_PREEMPT
182 mov (TI_preempt_count,a2),d0 # non-zero preempt_count ?
187 btst _TIF_NEED_RESCHED,(TI_flags,a2)
191 cmp EPSW_IM_7,d0 # interrupts off (exception path) ?
193 call preempt_schedule_irq[],0
198 ###############################################################################
200 # IRQ handler entry point
201 # - intended to be entered at multiple priorities
203 ###############################################################################
210 mov d0,(REG_ORIG_D0,fp)
213 call do_IRQ[],0 # do_IRQ(regs)
217 ###############################################################################
219 # Monitor Signal handler entry point
221 ###############################################################################
222 ENTRY(monitor_signal)
223 movbu (0xae000001),d1
235 movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
240 here: jmp 0x8e000008-here+0x8e000008
242 ###############################################################################
244 # Double Fault handler entry point
245 # - note that there will not be a stack, D0/A0 will hold EPSW/PC as were
247 ###############################################################################
255 mov a0,(__df_stack-4) # PC as was
256 mov d0,(__df_stack-8) # EPSW as was
257 mn10300_set_dbfleds # display 'db-f' on the LEDs
259 mov d0,(__df_stack-12) # no ORIG_D0
260 mov sp,a0 # save corrupted SP
261 mov __df_stack-12,sp # emergency supervisor stack
263 mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got
264 # clobbered by the CPU)
266 calls do_double_fault
268 bra double_fault_loop
270 ###############################################################################
272 # Bus Error handler entry point
273 # - handle external (async) bus errors separately
275 ###############################################################################
279 mov (BCBERR),d0 # what
280 btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error
281 beq __common_exception_aux # it wasn't
284 mov (BCBEAR),d1 # destination of erroneous access
286 mov (REG_ORIG_D0,fp),d2
289 mov d2,(REG_ORIG_D0,fp)
292 mov fp,(12,sp) # frame pointer
293 call io_bus_error[],0
296 ###############################################################################
298 # Miscellaneous exception entry points
300 ###############################################################################
305 bra __common_exception_nonmi
307 ENTRY(__common_exception)
311 __common_exception_aux:
313 and ~EPSW_NMID,epsw # turn NMIs back on if not NMI
316 __common_exception_nonmi:
317 and 0x0000FFFF,d0 # turn the exception code into a vector
325 SAVE_ALL # build the stack frame
327 mov (REG_D0,fp),a2 # get the exception number
328 mov (REG_ORIG_D0,fp),d0
331 mov d0,(REG_ORIG_D0,fp)
333 #ifdef CONFIG_GDBSTUB
334 btst 0x01,(gdbstub_busy)
339 call gdbstub_exception[],0 # gdbstub itself caused an exception
344 mov fp,d0 # arg 0: stacked register file
345 mov a2,d1 # arg 1: exception number
348 mov (exception_table,a2),a2
350 jmp ret_from_exception
352 1: pi # BUG() equivalent
354 ###############################################################################
356 # Exception handler functions table
358 ###############################################################################
360 ENTRY(exception_table)
362 .long uninitialised_exception
366 ###############################################################################
368 # Change an entry in the exception table
369 # - D0 exception code, D1 handler
371 ###############################################################################
372 ENTRY(set_excp_vector)
374 add exception_table,d0
377 #if defined(CONFIG_MN10300_CACHE_WBACK)
378 jmp mn10300_dcache_flush_inv_range2
383 ###############################################################################
387 ###############################################################################
389 ENTRY(sys_call_table)
390 .long sys_restart_syscall /* 0 */
395 .long sys_open /* 5 */
400 .long sys_unlink /* 10 */
405 .long sys_chmod /* 15 */
407 .long sys_ni_syscall /* old break syscall holder */
410 .long sys_getpid /* 20 */
415 .long sys_stime /* 25 */
420 .long sys_utime /* 30 */
421 .long sys_ni_syscall /* old stty syscall holder */
422 .long sys_ni_syscall /* old gtty syscall holder */
425 .long sys_ni_syscall /* 35 - old ftime syscall holder */
430 .long sys_rmdir /* 40 */
434 .long sys_ni_syscall /* old prof syscall holder */
435 .long sys_brk /* 45 */
440 .long sys_getegid16 /* 50 */
442 .long sys_umount /* recycled never used phys() */
443 .long sys_ni_syscall /* old lock syscall holder */
445 .long sys_fcntl /* 55 */
446 .long sys_ni_syscall /* old mpx syscall holder */
448 .long sys_ni_syscall /* old ulimit syscall holder */
449 .long sys_ni_syscall /* old sys_olduname */
450 .long sys_umask /* 60 */
455 .long sys_getpgrp /* 65 */
460 .long sys_setreuid16 /* 70 */
464 .long sys_sethostname
465 .long sys_setrlimit /* 75 */
466 .long sys_old_getrlimit
468 .long sys_gettimeofday
469 .long sys_settimeofday
470 .long sys_getgroups16 /* 80 */
471 .long sys_setgroups16
475 .long sys_readlink /* 85 */
479 .long sys_old_readdir
480 .long old_mmap /* 90 */
485 .long sys_fchown16 /* 95 */
486 .long sys_getpriority
487 .long sys_setpriority
488 .long sys_ni_syscall /* old profil syscall holder */
490 .long sys_fstatfs /* 100 */
491 .long sys_ni_syscall /* ioperm */
495 .long sys_getitimer /* 105 */
499 .long sys_ni_syscall /* old sys_uname */
500 .long sys_ni_syscall /* 110 - iopl */
502 .long sys_ni_syscall /* old "idle" system call */
503 .long sys_ni_syscall /* vm86old */
505 .long sys_swapoff /* 115 */
510 .long sys_clone /* 120 */
511 .long sys_setdomainname
513 .long sys_ni_syscall /* modify_ldt */
515 .long sys_mprotect /* 125 */
516 .long sys_sigprocmask
517 .long sys_ni_syscall /* old "create_module" */
518 .long sys_init_module
519 .long sys_delete_module
520 .long sys_ni_syscall /* 130: old "get_kernel_syms" */
525 .long sys_sysfs /* 135 */
526 .long sys_personality
527 .long sys_ni_syscall /* reserved for afs_syscall */
530 .long sys_llseek /* 140 */
535 .long sys_readv /* 145 */
540 .long sys_mlock /* 150 */
544 .long sys_sched_setparam
545 .long sys_sched_getparam /* 155 */
546 .long sys_sched_setscheduler
547 .long sys_sched_getscheduler
548 .long sys_sched_yield
549 .long sys_sched_get_priority_max
550 .long sys_sched_get_priority_min /* 160 */
551 .long sys_sched_rr_get_interval
554 .long sys_setresuid16
555 .long sys_getresuid16 /* 165 */
556 .long sys_ni_syscall /* vm86 */
557 .long sys_ni_syscall /* Old sys_query_module */
560 .long sys_setresgid16 /* 170 */
561 .long sys_getresgid16
563 .long sys_rt_sigreturn
564 .long sys_rt_sigaction
565 .long sys_rt_sigprocmask /* 175 */
566 .long sys_rt_sigpending
567 .long sys_rt_sigtimedwait
568 .long sys_rt_sigqueueinfo
569 .long sys_rt_sigsuspend
570 .long sys_pread64 /* 180 */
575 .long sys_capset /* 185 */
576 .long sys_sigaltstack
578 .long sys_ni_syscall /* reserved for streams1 */
579 .long sys_ni_syscall /* reserved for streams2 */
580 .long sys_vfork /* 190 */
584 .long sys_ftruncate64
585 .long sys_stat64 /* 195 */
590 .long sys_getgid /* 200 */
595 .long sys_getgroups /* 205 */
600 .long sys_setresgid /* 210 */
605 .long sys_setfsuid /* 215 */
610 .long sys_getdents64 /* 220 */
612 .long sys_ni_syscall /* reserved for TUX */
615 .long sys_readahead /* 225 */
620 .long sys_lgetxattr /* 230 */
625 .long sys_removexattr /* 235 */
626 .long sys_lremovexattr
627 .long sys_fremovexattr
630 .long sys_futex /* 240 */
631 .long sys_sched_setaffinity
632 .long sys_sched_getaffinity
633 .long sys_ni_syscall /* sys_set_thread_area */
634 .long sys_ni_syscall /* sys_get_thread_area */
635 .long sys_io_setup /* 245 */
637 .long sys_io_getevents
640 .long sys_fadvise64 /* 250 */
643 .long sys_lookup_dcookie
644 .long sys_epoll_create
645 .long sys_epoll_ctl /* 255 */
647 .long sys_remap_file_pages
648 .long sys_set_tid_address
649 .long sys_timer_create
650 .long sys_timer_settime /* 260 */
651 .long sys_timer_gettime
652 .long sys_timer_getoverrun
653 .long sys_timer_delete
654 .long sys_clock_settime
655 .long sys_clock_gettime /* 265 */
656 .long sys_clock_getres
657 .long sys_clock_nanosleep
660 .long sys_tgkill /* 270 */
662 .long sys_fadvise64_64
663 .long sys_ni_syscall /* sys_vserver */
665 .long sys_get_mempolicy /* 275 */
666 .long sys_set_mempolicy
669 .long sys_mq_timedsend
670 .long sys_mq_timedreceive /* 280 */
672 .long sys_mq_getsetattr
675 .long sys_ni_syscall /* 285 */ /* available */
677 .long sys_request_key
680 .long sys_ioprio_set /* 290 */
682 .long sys_inotify_init
683 .long sys_inotify_add_watch
684 .long sys_inotify_rm_watch
685 .long sys_migrate_pages /* 295 */
690 .long sys_futimesat /* 300 */
695 .long sys_symlinkat /* 305 */
700 .long sys_ppoll /* 310 */
702 .long sys_set_robust_list
703 .long sys_get_robust_list
705 .long sys_sync_file_range /* 315 */
710 .long sys_epoll_pwait /* 320 */
713 .long sys_timerfd_create
715 .long sys_fallocate /* 325 */
716 .long sys_timerfd_settime
717 .long sys_timerfd_gettime
720 .long sys_epoll_create1 /* 330 */
723 .long sys_inotify_init1
725 .long sys_pwritev /* 335 */
726 .long sys_rt_tgsigqueueinfo
727 .long sys_perf_event_open
731 nr_syscalls=(.-sys_call_table)/4