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1/* -*- mode: asm -*-
2 *
3 * linux/arch/m68k/kernel/entry.S
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file README.legal in the main directory of this archive
9 * for more details.
10 *
11 * Linux/m68k support by Hamish Macdonald
12 *
13 * 68060 fixes by Jesper Skov
14 *
15 */
16
17/*
18 * entry.S contains the system-call and fault low-level handling routines.
19 * This also contains the timer-interrupt handler, as well as all interrupts
20 * and faults that can result in a task-switch.
21 *
22 * NOTE: This code handles signal-recognition, which happens every time
23 * after a timer-interrupt and after each system call.
24 *
25 */
26
27/*
28 * 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
29 * all pointers that used to be 'current' are now entry
30 * number 0 in the 'current_set' list.
31 *
32 * 6/05/00 RZ: addedd writeback completion after return from sighandler
33 * for 68040
34 */
35
36#include <linux/config.h>
37#include <linux/linkage.h>
38#include <asm/entry.h>
39#include <asm/errno.h>
40#include <asm/setup.h>
41#include <asm/segment.h>
42#include <asm/traps.h>
43#include <asm/unistd.h>
44
45#include <asm/offsets.h>
46
47.globl system_call, buserr, trap
48.globl resume, ret_from_exception
49.globl ret_from_signal
50.globl inthandler, sys_call_table
51.globl sys_fork, sys_clone, sys_vfork
52.globl ret_from_interrupt, bad_interrupt
53
54.text
55ENTRY(buserr)
56 SAVE_ALL_INT
57 GET_CURRENT(%d0)
58 movel %sp,%sp@- | stack frame pointer argument
59 bsrl buserr_c
60 addql #4,%sp
61 jra ret_from_exception
62
63ENTRY(trap)
64 SAVE_ALL_INT
65 GET_CURRENT(%d0)
66 movel %sp,%sp@- | stack frame pointer argument
67 bsrl trap_c
68 addql #4,%sp
69 jra ret_from_exception
70
71 | After a fork we jump here directly from resume,
72 | so that %d1 contains the previous task
73 | schedule_tail now used regardless of CONFIG_SMP
74ENTRY(ret_from_fork)
75 movel %d1,%sp@-
76 jsr schedule_tail
77 addql #4,%sp
78 jra ret_from_exception
79
80badsys:
81 movel #-ENOSYS,%sp@(PT_D0)
82 jra ret_from_exception
83
84do_trace:
85 movel #-ENOSYS,%sp@(PT_D0) | needed for strace
86 subql #4,%sp
87 SAVE_SWITCH_STACK
88 jbsr syscall_trace
89 RESTORE_SWITCH_STACK
90 addql #4,%sp
91 movel %sp@(PT_ORIG_D0),%d1
92 movel #-ENOSYS,%d0
93 cmpl #NR_syscalls,%d1
94 jcc 1f
95 jbsr @(sys_call_table,%d1:l:4)@(0)
961: movel %d0,%sp@(PT_D0) | save the return value
97 subql #4,%sp | dummy return address
98 SAVE_SWITCH_STACK
99 jbsr syscall_trace
100
101ret_from_signal:
102 RESTORE_SWITCH_STACK
103 addql #4,%sp
104/* on 68040 complete pending writebacks if any */
105#ifdef CONFIG_M68040
106 bfextu %sp@(PT_VECTOR){#0,#4},%d0
107 subql #7,%d0 | bus error frame ?
108 jbne 1f
109 movel %sp,%sp@-
110 jbsr berr_040cleanup
111 addql #4,%sp
1121:
113#endif
114 jra ret_from_exception
115
116ENTRY(system_call)
117 SAVE_ALL_SYS
118
119 GET_CURRENT(%d1)
120 | save top of frame
121 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
122
123 tstb %curptr@(TASK_SYSCALL_TRACE)
124 jne do_trace
125 cmpl #NR_syscalls,%d0
126 jcc badsys
127 jbsr @(sys_call_table,%d0:l:4)@(0)
128 movel %d0,%sp@(PT_D0) | save the return value
129
130 |oriw #0x0700,%sr
131 movel %curptr@(TASK_WORK),%d0
132 jne syscall_exit_work
1331: RESTORE_ALL
134
135syscall_exit_work:
136 btst #5,%sp@(PT_SR) | check if returning to kernel
137 bnes 1b | if so, skip resched, signals
138 tstw %d0
139 jeq do_signal_return
140 tstb %d0
141 jne do_delayed_trace
142
143 pea resume_userspace
144 jmp schedule
145
146ret_from_exception:
147 btst #5,%sp@(PT_SR) | check if returning to kernel
148 bnes 1f | if so, skip resched, signals
149 | only allow interrupts when we are really the last one on the
150 | kernel stack, otherwise stack overflow can occur during
151 | heavy interrupt load
152 andw #ALLOWINT,%sr
153
154resume_userspace:
155 movel %curptr@(TASK_WORK),%d0
156 lsrl #8,%d0
157 jne exit_work
1581: RESTORE_ALL
159
160exit_work:
161 | save top of frame
162 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
163 tstb %d0
164 jeq do_signal_return
165
166 pea resume_userspace
167 jmp schedule
168
169do_signal_return:
170 |andw #ALLOWINT,%sr
171 subql #4,%sp | dummy return address
172 SAVE_SWITCH_STACK
173 pea %sp@(SWITCH_STACK_SIZE)
174 clrl %sp@-
175 bsrl do_signal
176 addql #8,%sp
177 RESTORE_SWITCH_STACK
178 addql #4,%sp
179 jbra resume_userspace
180
181do_delayed_trace:
182 bclr #7,%sp@(PT_SR) | clear trace bit in SR
183 pea 1 | send SIGTRAP
184 movel %curptr,%sp@-
185 pea LSIGTRAP
186 jbsr send_sig
187 addql #8,%sp
188 addql #4,%sp
189 jbra resume_userspace
190
191
192#if 0
193#ifdef CONFIG_AMIGA
194ami_inthandler:
195 addql #1,irq_stat+CPUSTAT_LOCAL_IRQ_COUNT
196 SAVE_ALL_INT
197 GET_CURRENT(%d0)
198
199 bfextu %sp@(PT_VECTOR){#4,#12},%d0
200 movel %d0,%a0
201 addql #1,%a0@(kstat+STAT_IRQ-VECOFF(VEC_SPUR))
202 movel %a0@(autoirq_list-VECOFF(VEC_SPUR)),%a0
203
204| amiga vector int handler get the req mask instead of irq vector
205 lea CUSTOMBASE,%a1
206 movew %a1@(C_INTREQR),%d0
207 andw %a1@(C_INTENAR),%d0
208
209| prepare stack (push frame pointer, dev_id & req mask)
210 pea %sp@
211 movel %a0@(IRQ_DEVID),%sp@-
212 movel %d0,%sp@-
213 pea %pc@(ret_from_interrupt:w)
214 jbra @(IRQ_HANDLER,%a0)@(0)
215
216ENTRY(nmi_handler)
217 rte
218#endif
219#endif
220
221/*
222** This is the main interrupt handler, responsible for calling process_int()
223*/
224inthandler:
225 SAVE_ALL_INT
226 GET_CURRENT(%d0)
227 addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+2)
228 | put exception # in d0
229 bfextu %sp@(PT_VECTOR){#4,#10},%d0
230
231 movel %sp,%sp@-
232 movel %d0,%sp@- | put vector # on stack
233#if defined(MACH_Q40_ONLY) && defined(CONFIG_BLK_DEV_FD)
234 btstb #4,0xff000000 | Q40 floppy needs very special treatment ...
235 jbeq 1f
236 btstb #3,0xff000004
237 jbeq 1f
238 jbsr floppy_hardint
239 jbra 3f
2401:
241#endif
242 jbsr process_int | process the IRQ
2433: addql #8,%sp | pop parameters off stack
244
245ret_from_interrupt:
246 subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+2)
247 jeq 1f
2482:
249 RESTORE_ALL
2501:
251 moveq #(~ALLOWINT>>8)&0xff,%d0
252 andb %sp@(PT_SR),%d0
253 jne 2b
254
255 /* check if we need to do software interrupts */
256 tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
257 jeq ret_from_exception
258 pea ret_from_exception
259 jra do_softirq
260
261
262/* Handler for uninitialized and spurious interrupts */
263
264bad_interrupt:
265 addql #1,num_spurious
266 rte
267
268ENTRY(sys_fork)
269 SAVE_SWITCH_STACK
270 pea %sp@(SWITCH_STACK_SIZE)
271 jbsr m68k_fork
272 addql #4,%sp
273 RESTORE_SWITCH_STACK
274 rts
275
276ENTRY(sys_clone)
277 SAVE_SWITCH_STACK
278 pea %sp@(SWITCH_STACK_SIZE)
279 jbsr m68k_clone
280 addql #4,%sp
281 RESTORE_SWITCH_STACK
282 rts
283
284ENTRY(sys_vfork)
285 SAVE_SWITCH_STACK
286 pea %sp@(SWITCH_STACK_SIZE)
287 jbsr m68k_vfork
288 addql #4,%sp
289 RESTORE_SWITCH_STACK
290 rts
291
292ENTRY(sys_sigsuspend)
293 SAVE_SWITCH_STACK
294 pea %sp@(SWITCH_STACK_SIZE)
295 jbsr do_sigsuspend
296 addql #4,%sp
297 RESTORE_SWITCH_STACK
298 rts
299
300ENTRY(sys_rt_sigsuspend)
301 SAVE_SWITCH_STACK
302 pea %sp@(SWITCH_STACK_SIZE)
303 jbsr do_rt_sigsuspend
304 addql #4,%sp
305 RESTORE_SWITCH_STACK
306 rts
307
308ENTRY(sys_sigreturn)
309 SAVE_SWITCH_STACK
310 jbsr do_sigreturn
311 RESTORE_SWITCH_STACK
312 rts
313
314ENTRY(sys_rt_sigreturn)
315 SAVE_SWITCH_STACK
316 jbsr do_rt_sigreturn
317 RESTORE_SWITCH_STACK
318 rts
319
320resume:
321 /*
322 * Beware - when entering resume, prev (the current task) is
323 * in a0, next (the new task) is in a1,so don't change these
324 * registers until their contents are no longer needed.
325 */
326
327 /* save sr */
328 movew %sr,%a0@(TASK_THREAD+THREAD_SR)
329
330 /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
331 movec %sfc,%d0
332 movew %d0,%a0@(TASK_THREAD+THREAD_FS)
333
334 /* save usp */
335 /* it is better to use a movel here instead of a movew 8*) */
336 movec %usp,%d0
337 movel %d0,%a0@(TASK_THREAD+THREAD_USP)
338
339 /* save non-scratch registers on stack */
340 SAVE_SWITCH_STACK
341
342 /* save current kernel stack pointer */
343 movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
344
345 /* save floating point context */
346#ifndef CONFIG_M68KFPU_EMU_ONLY
347#ifdef CONFIG_M68KFPU_EMU
348 tstl m68k_fputype
349 jeq 3f
350#endif
351 fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
352
353#if defined(CONFIG_M68060)
354#if !defined(CPU_M68060_ONLY)
355 btst #3,m68k_cputype+3
356 beqs 1f
357#endif
358 /* The 060 FPU keeps status in bits 15-8 of the first longword */
359 tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
360 jeq 3f
361#if !defined(CPU_M68060_ONLY)
362 jra 2f
363#endif
364#endif /* CONFIG_M68060 */
365#if !defined(CPU_M68060_ONLY)
3661: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
367 jeq 3f
368#endif
3692: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
370 fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
3713:
372#endif /* CONFIG_M68KFPU_EMU_ONLY */
373 /* Return previous task in %d1 */
374 movel %curptr,%d1
375
376 /* switch to new task (a1 contains new task) */
377 movel %a1,%curptr
378
379 /* restore floating point context */
380#ifndef CONFIG_M68KFPU_EMU_ONLY
381#ifdef CONFIG_M68KFPU_EMU
382 tstl m68k_fputype
383 jeq 4f
384#endif
385#if defined(CONFIG_M68060)
386#if !defined(CPU_M68060_ONLY)
387 btst #3,m68k_cputype+3
388 beqs 1f
389#endif
390 /* The 060 FPU keeps status in bits 15-8 of the first longword */
391 tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
392 jeq 3f
393#if !defined(CPU_M68060_ONLY)
394 jra 2f
395#endif
396#endif /* CONFIG_M68060 */
397#if !defined(CPU_M68060_ONLY)
3981: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
399 jeq 3f
400#endif
4012: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
402 fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
4033: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
4044:
405#endif /* CONFIG_M68KFPU_EMU_ONLY */
406
407 /* restore the kernel stack pointer */
408 movel %a1@(TASK_THREAD+THREAD_KSP),%sp
409
410 /* restore non-scratch registers */
411 RESTORE_SWITCH_STACK
412
413 /* restore user stack pointer */
414 movel %a1@(TASK_THREAD+THREAD_USP),%a0
415 movel %a0,%usp
416
417 /* restore fs (sfc,%dfc) */
418 movew %a1@(TASK_THREAD+THREAD_FS),%a0
419 movec %a0,%sfc
420 movec %a0,%dfc
421
422 /* restore status register */
423 movew %a1@(TASK_THREAD+THREAD_SR),%sr
424
425 rts
426
427.data
428ALIGN
429sys_call_table:
430 .long sys_ni_syscall /* 0 - old "setup()" system call*/
431 .long sys_exit
432 .long sys_fork
433 .long sys_read
434 .long sys_write
435 .long sys_open /* 5 */
436 .long sys_close
437 .long sys_waitpid
438 .long sys_creat
439 .long sys_link
440 .long sys_unlink /* 10 */
441 .long sys_execve
442 .long sys_chdir
443 .long sys_time
444 .long sys_mknod
445 .long sys_chmod /* 15 */
446 .long sys_chown16
447 .long sys_ni_syscall /* old break syscall holder */
448 .long sys_stat
449 .long sys_lseek
450 .long sys_getpid /* 20 */
451 .long sys_mount
452 .long sys_oldumount
453 .long sys_setuid16
454 .long sys_getuid16
455 .long sys_stime /* 25 */
456 .long sys_ptrace
457 .long sys_alarm
458 .long sys_fstat
459 .long sys_pause
460 .long sys_utime /* 30 */
461 .long sys_ni_syscall /* old stty syscall holder */
462 .long sys_ni_syscall /* old gtty syscall holder */
463 .long sys_access
464 .long sys_nice
465 .long sys_ni_syscall /* 35 */ /* old ftime syscall holder */
466 .long sys_sync
467 .long sys_kill
468 .long sys_rename
469 .long sys_mkdir
470 .long sys_rmdir /* 40 */
471 .long sys_dup
472 .long sys_pipe
473 .long sys_times
474 .long sys_ni_syscall /* old prof syscall holder */
475 .long sys_brk /* 45 */
476 .long sys_setgid16
477 .long sys_getgid16
478 .long sys_signal
479 .long sys_geteuid16
480 .long sys_getegid16 /* 50 */
481 .long sys_acct
482 .long sys_umount /* recycled never used phys() */
483 .long sys_ni_syscall /* old lock syscall holder */
484 .long sys_ioctl
485 .long sys_fcntl /* 55 */
486 .long sys_ni_syscall /* old mpx syscall holder */
487 .long sys_setpgid
488 .long sys_ni_syscall /* old ulimit syscall holder */
489 .long sys_ni_syscall
490 .long sys_umask /* 60 */
491 .long sys_chroot
492 .long sys_ustat
493 .long sys_dup2
494 .long sys_getppid
495 .long sys_getpgrp /* 65 */
496 .long sys_setsid
497 .long sys_sigaction
498 .long sys_sgetmask
499 .long sys_ssetmask
500 .long sys_setreuid16 /* 70 */
501 .long sys_setregid16
502 .long sys_sigsuspend
503 .long sys_sigpending
504 .long sys_sethostname
505 .long sys_setrlimit /* 75 */
506 .long sys_old_getrlimit
507 .long sys_getrusage
508 .long sys_gettimeofday
509 .long sys_settimeofday
510 .long sys_getgroups16 /* 80 */
511 .long sys_setgroups16
512 .long old_select
513 .long sys_symlink
514 .long sys_lstat
515 .long sys_readlink /* 85 */
516 .long sys_uselib
517 .long sys_swapon
518 .long sys_reboot
519 .long old_readdir
520 .long old_mmap /* 90 */
521 .long sys_munmap
522 .long sys_truncate
523 .long sys_ftruncate
524 .long sys_fchmod
525 .long sys_fchown16 /* 95 */
526 .long sys_getpriority
527 .long sys_setpriority
528 .long sys_ni_syscall /* old profil syscall holder */
529 .long sys_statfs
530 .long sys_fstatfs /* 100 */
531 .long sys_ni_syscall /* ioperm for i386 */
532 .long sys_socketcall
533 .long sys_syslog
534 .long sys_setitimer
535 .long sys_getitimer /* 105 */
536 .long sys_newstat
537 .long sys_newlstat
538 .long sys_newfstat
539 .long sys_ni_syscall
540 .long sys_ni_syscall /* 110 */ /* iopl for i386 */
541 .long sys_vhangup
542 .long sys_ni_syscall /* obsolete idle() syscall */
543 .long sys_ni_syscall /* vm86old for i386 */
544 .long sys_wait4
545 .long sys_swapoff /* 115 */
546 .long sys_sysinfo
547 .long sys_ipc
548 .long sys_fsync
549 .long sys_sigreturn
550 .long sys_clone /* 120 */
551 .long sys_setdomainname
552 .long sys_newuname
553 .long sys_cacheflush /* modify_ldt for i386 */
554 .long sys_adjtimex
555 .long sys_mprotect /* 125 */
556 .long sys_sigprocmask
557 .long sys_ni_syscall /* old "create_module" */
558 .long sys_init_module
559 .long sys_delete_module
560 .long sys_ni_syscall /* 130 - old "get_kernel_syms" */
561 .long sys_quotactl
562 .long sys_getpgid
563 .long sys_fchdir
564 .long sys_bdflush
565 .long sys_sysfs /* 135 */
566 .long sys_personality
567 .long sys_ni_syscall /* for afs_syscall */
568 .long sys_setfsuid16
569 .long sys_setfsgid16
570 .long sys_llseek /* 140 */
571 .long sys_getdents
572 .long sys_select
573 .long sys_flock
574 .long sys_msync
575 .long sys_readv /* 145 */
576 .long sys_writev
577 .long sys_getsid
578 .long sys_fdatasync
579 .long sys_sysctl
580 .long sys_mlock /* 150 */
581 .long sys_munlock
582 .long sys_mlockall
583 .long sys_munlockall
584 .long sys_sched_setparam
585 .long sys_sched_getparam /* 155 */
586 .long sys_sched_setscheduler
587 .long sys_sched_getscheduler
588 .long sys_sched_yield
589 .long sys_sched_get_priority_max
590 .long sys_sched_get_priority_min /* 160 */
591 .long sys_sched_rr_get_interval
592 .long sys_nanosleep
593 .long sys_mremap
594 .long sys_setresuid16
595 .long sys_getresuid16 /* 165 */
596 .long sys_getpagesize
597 .long sys_ni_syscall /* old sys_query_module */
598 .long sys_poll
599 .long sys_nfsservctl
600 .long sys_setresgid16 /* 170 */
601 .long sys_getresgid16
602 .long sys_prctl
603 .long sys_rt_sigreturn
604 .long sys_rt_sigaction
605 .long sys_rt_sigprocmask /* 175 */
606 .long sys_rt_sigpending
607 .long sys_rt_sigtimedwait
608 .long sys_rt_sigqueueinfo
609 .long sys_rt_sigsuspend
610 .long sys_pread64 /* 180 */
611 .long sys_pwrite64
612 .long sys_lchown16;
613 .long sys_getcwd
614 .long sys_capget
615 .long sys_capset /* 185 */
616 .long sys_sigaltstack
617 .long sys_sendfile
618 .long sys_ni_syscall /* streams1 */
619 .long sys_ni_syscall /* streams2 */
620 .long sys_vfork /* 190 */
621 .long sys_getrlimit
622 .long sys_mmap2
623 .long sys_truncate64
624 .long sys_ftruncate64
625 .long sys_stat64 /* 195 */
626 .long sys_lstat64
627 .long sys_fstat64
628 .long sys_chown
629 .long sys_getuid
630 .long sys_getgid /* 200 */
631 .long sys_geteuid
632 .long sys_getegid
633 .long sys_setreuid
634 .long sys_setregid
635 .long sys_getgroups /* 205 */
636 .long sys_setgroups
637 .long sys_fchown
638 .long sys_setresuid
639 .long sys_getresuid
640 .long sys_setresgid /* 210 */
641 .long sys_getresgid
642 .long sys_lchown
643 .long sys_setuid
644 .long sys_setgid
645 .long sys_setfsuid /* 215 */
646 .long sys_setfsgid
647 .long sys_pivot_root
648 .long sys_ni_syscall
649 .long sys_ni_syscall
650 .long sys_getdents64 /* 220 */
651 .long sys_gettid
652 .long sys_tkill
653 .long sys_setxattr
654 .long sys_lsetxattr
655 .long sys_fsetxattr /* 225 */
656 .long sys_getxattr
657 .long sys_lgetxattr
658 .long sys_fgetxattr
659 .long sys_listxattr
660 .long sys_llistxattr /* 230 */
661 .long sys_flistxattr
662 .long sys_removexattr
663 .long sys_lremovexattr
664 .long sys_fremovexattr
665 .long sys_futex /* 235 */
666 .long sys_sendfile64
667 .long sys_mincore
668 .long sys_madvise
669 .long sys_fcntl64
670 .long sys_readahead /* 240 */
671 .long sys_io_setup
672 .long sys_io_destroy
673 .long sys_io_getevents
674 .long sys_io_submit
675 .long sys_io_cancel /* 245 */
676 .long sys_fadvise64
677 .long sys_exit_group
678 .long sys_lookup_dcookie
679 .long sys_epoll_create
680 .long sys_epoll_ctl /* 250 */
681 .long sys_epoll_wait
682 .long sys_remap_file_pages
683 .long sys_set_tid_address
684 .long sys_timer_create
685 .long sys_timer_settime /* 255 */
686 .long sys_timer_gettime
687 .long sys_timer_getoverrun
688 .long sys_timer_delete
689 .long sys_clock_settime
690 .long sys_clock_gettime /* 260 */
691 .long sys_clock_getres
692 .long sys_clock_nanosleep
693 .long sys_statfs64
694 .long sys_fstatfs64
695 .long sys_tgkill /* 265 */
696 .long sys_utimes
697 .long sys_fadvise64_64
698 .long sys_mbind
699 .long sys_get_mempolicy
700 .long sys_set_mempolicy /* 270 */
701 .long sys_mq_open
702 .long sys_mq_unlink
703 .long sys_mq_timedsend
704 .long sys_mq_timedreceive
705 .long sys_mq_notify /* 275 */
706 .long sys_mq_getsetattr
707 .long sys_waitid
708 .long sys_ni_syscall /* for sys_vserver */
709 .long sys_add_key
710 .long sys_request_key /* 280 */
711 .long sys_keyctl
712