3 * linux/arch/m68k/kernel/entry.S
5 * Copyright (C) 1991, 1992 Linus Torvalds
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
11 * Linux/m68k support by Hamish Macdonald
13 * 68060 fixes by Jesper Skov
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.
22 * NOTE: This code handles signal-recognition, which happens every time
23 * after a timer-interrupt and after each system call.
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.
32 * 6/05/00 RZ: addedd writeback completion after return from sighandler
36 #include <linux/linkage.h>
37 #include <asm/entry.h>
38 #include <asm/errno.h>
39 #include <asm/setup.h>
40 #include <asm/segment.h>
41 #include <asm/traps.h>
42 #include <asm/unistd.h>
44 #include <asm/asm-offsets.h>
46 .globl system_call, buserr, trap, resume
48 .globl sys_fork, sys_clone, sys_vfork
49 .globl ret_from_interrupt, bad_interrupt
50 .globl auto_irqhandler_fixup
51 .globl user_irqvec_fixup, user_irqhandler_fixup
57 movel %sp,%sp@- | stack frame pointer argument
60 jra .Lret_from_exception
65 movel %sp,%sp@- | stack frame pointer argument
68 jra .Lret_from_exception
70 | After a fork we jump here directly from resume,
71 | so that %d1 contains the previous task
72 | schedule_tail now used regardless of CONFIG_SMP
77 jra .Lret_from_exception
80 movel #-ENOSYS,%sp@(PT_OFF_D0)| needed for strace
86 movel %sp@(PT_OFF_ORIG_D0),%d0
90 movel #-ENOSYS,%sp@(PT_OFF_D0)
99 jra .Lret_from_exception
101 ENTRY(ret_from_signal)
102 tstb %curptr@(TASK_INFO+TINFO_FLAGS+2)
105 1: RESTORE_SWITCH_STACK
107 /* on 68040 complete pending writebacks if any */
109 bfextu %sp@(PT_OFF_FORMATVEC){#0,#4},%d0
110 subql #7,%d0 | bus error frame ?
117 jra .Lret_from_exception
124 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
127 tstb %curptr@(TASK_INFO+TINFO_FLAGS+2)
129 cmpl #NR_syscalls,%d0
132 jbsr @(sys_call_table,%d0:l:4)@(0)
133 movel %d0,%sp@(PT_OFF_D0) | save the return value
136 movew %curptr@(TASK_INFO+TINFO_FLAGS+2),%d0
137 jne syscall_exit_work
141 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
142 bnes 1b | if so, skip resched, signals
152 ENTRY(ret_from_exception)
153 .Lret_from_exception:
154 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
155 bnes 1f | if so, skip resched, signals
156 | only allow interrupts when we are really the last one on the
157 | kernel stack, otherwise stack overflow can occur during
158 | heavy interrupt load
162 moveb %curptr@(TASK_INFO+TINFO_FLAGS+3),%d0
168 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
177 subql #4,%sp | dummy return address
179 pea %sp@(SWITCH_STACK_SIZE)
184 jbra resume_userspace
187 bclr #7,%sp@(PT_OFF_SR) | clear trace bit in SR
194 jbra resume_userspace
197 /* This is the main interrupt handler for autovector interrupts */
199 ENTRY(auto_inthandler)
202 addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
203 | put exception # in d0
204 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
208 movel %d0,%sp@- | put vector # on stack
209 auto_irqhandler_fixup = . + 2
210 jsr __m68k_handle_int | process the IRQ
211 addql #8,%sp | pop parameters off stack
214 subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
215 jeq ret_from_last_interrupt
219 ret_from_last_interrupt:
220 moveq #(~ALLOWINT>>8)&0xff,%d0
221 andb %sp@(PT_OFF_SR),%d0
224 /* check if we need to do software interrupts */
225 tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
226 jeq .Lret_from_exception
227 pea ret_from_exception
230 /* Handler for user defined interrupt vectors */
232 ENTRY(user_inthandler)
235 addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
236 | put exception # in d0
237 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
238 user_irqvec_fixup = . + 2
242 movel %d0,%sp@- | put vector # on stack
243 user_irqhandler_fixup = . + 2
244 jsr __m68k_handle_int | process the IRQ
245 addql #8,%sp | pop parameters off stack
247 subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
248 jeq ret_from_last_interrupt
251 /* Handler for uninitialized and spurious interrupts */
253 ENTRY(bad_inthandler)
256 addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
262 subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
263 jeq ret_from_last_interrupt
269 pea %sp@(SWITCH_STACK_SIZE)
277 pea %sp@(SWITCH_STACK_SIZE)
285 pea %sp@(SWITCH_STACK_SIZE)
297 ENTRY(sys_rt_sigreturn)
305 * Beware - when entering resume, prev (the current task) is
306 * in a0, next (the new task) is in a1,so don't change these
307 * registers until their contents are no longer needed.
311 movew %sr,%a0@(TASK_THREAD+THREAD_SR)
313 /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
315 movew %d0,%a0@(TASK_THREAD+THREAD_FS)
318 /* it is better to use a movel here instead of a movew 8*) */
320 movel %d0,%a0@(TASK_THREAD+THREAD_USP)
322 /* save non-scratch registers on stack */
325 /* save current kernel stack pointer */
326 movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
328 /* save floating point context */
329 #ifndef CONFIG_M68KFPU_EMU_ONLY
330 #ifdef CONFIG_M68KFPU_EMU
334 fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
336 #if defined(CONFIG_M68060)
337 #if !defined(CPU_M68060_ONLY)
338 btst #3,m68k_cputype+3
341 /* The 060 FPU keeps status in bits 15-8 of the first longword */
342 tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
344 #if !defined(CPU_M68060_ONLY)
347 #endif /* CONFIG_M68060 */
348 #if !defined(CPU_M68060_ONLY)
349 1: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
352 2: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
353 fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
355 #endif /* CONFIG_M68KFPU_EMU_ONLY */
356 /* Return previous task in %d1 */
359 /* switch to new task (a1 contains new task) */
362 /* restore floating point context */
363 #ifndef CONFIG_M68KFPU_EMU_ONLY
364 #ifdef CONFIG_M68KFPU_EMU
368 #if defined(CONFIG_M68060)
369 #if !defined(CPU_M68060_ONLY)
370 btst #3,m68k_cputype+3
373 /* The 060 FPU keeps status in bits 15-8 of the first longword */
374 tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
376 #if !defined(CPU_M68060_ONLY)
379 #endif /* CONFIG_M68060 */
380 #if !defined(CPU_M68060_ONLY)
381 1: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
384 2: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
385 fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
386 3: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
388 #endif /* CONFIG_M68KFPU_EMU_ONLY */
390 /* restore the kernel stack pointer */
391 movel %a1@(TASK_THREAD+THREAD_KSP),%sp
393 /* restore non-scratch registers */
396 /* restore user stack pointer */
397 movel %a1@(TASK_THREAD+THREAD_USP),%a0
400 /* restore fs (sfc,%dfc) */
401 movew %a1@(TASK_THREAD+THREAD_FS),%a0
405 /* restore status register */
406 movew %a1@(TASK_THREAD+THREAD_SR),%sr
413 .long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */
418 .long sys_open /* 5 */
423 .long sys_unlink /* 10 */
428 .long sys_chmod /* 15 */
430 .long sys_ni_syscall /* old break syscall holder */
433 .long sys_getpid /* 20 */
438 .long sys_stime /* 25 */
443 .long sys_utime /* 30 */
444 .long sys_ni_syscall /* old stty syscall holder */
445 .long sys_ni_syscall /* old gtty syscall holder */
448 .long sys_ni_syscall /* 35 */ /* old ftime syscall holder */
453 .long sys_rmdir /* 40 */
457 .long sys_ni_syscall /* old prof syscall holder */
458 .long sys_brk /* 45 */
463 .long sys_getegid16 /* 50 */
465 .long sys_umount /* recycled never used phys() */
466 .long sys_ni_syscall /* old lock syscall holder */
468 .long sys_fcntl /* 55 */
469 .long sys_ni_syscall /* old mpx syscall holder */
471 .long sys_ni_syscall /* old ulimit syscall holder */
473 .long sys_umask /* 60 */
478 .long sys_getpgrp /* 65 */
483 .long sys_setreuid16 /* 70 */
487 .long sys_sethostname
488 .long sys_setrlimit /* 75 */
489 .long sys_old_getrlimit
491 .long sys_gettimeofday
492 .long sys_settimeofday
493 .long sys_getgroups16 /* 80 */
494 .long sys_setgroups16
498 .long sys_readlink /* 85 */
502 .long sys_old_readdir
503 .long sys_old_mmap /* 90 */
508 .long sys_fchown16 /* 95 */
509 .long sys_getpriority
510 .long sys_setpriority
511 .long sys_ni_syscall /* old profil syscall holder */
513 .long sys_fstatfs /* 100 */
514 .long sys_ni_syscall /* ioperm for i386 */
518 .long sys_getitimer /* 105 */
523 .long sys_ni_syscall /* 110 */ /* iopl for i386 */
525 .long sys_ni_syscall /* obsolete idle() syscall */
526 .long sys_ni_syscall /* vm86old for i386 */
528 .long sys_swapoff /* 115 */
533 .long sys_clone /* 120 */
534 .long sys_setdomainname
536 .long sys_cacheflush /* modify_ldt for i386 */
538 .long sys_mprotect /* 125 */
539 .long sys_sigprocmask
540 .long sys_ni_syscall /* old "create_module" */
541 .long sys_init_module
542 .long sys_delete_module
543 .long sys_ni_syscall /* 130 - old "get_kernel_syms" */
548 .long sys_sysfs /* 135 */
549 .long sys_personality
550 .long sys_ni_syscall /* for afs_syscall */
553 .long sys_llseek /* 140 */
558 .long sys_readv /* 145 */
563 .long sys_mlock /* 150 */
567 .long sys_sched_setparam
568 .long sys_sched_getparam /* 155 */
569 .long sys_sched_setscheduler
570 .long sys_sched_getscheduler
571 .long sys_sched_yield
572 .long sys_sched_get_priority_max
573 .long sys_sched_get_priority_min /* 160 */
574 .long sys_sched_rr_get_interval
577 .long sys_setresuid16
578 .long sys_getresuid16 /* 165 */
579 .long sys_getpagesize
580 .long sys_ni_syscall /* old sys_query_module */
583 .long sys_setresgid16 /* 170 */
584 .long sys_getresgid16
586 .long sys_rt_sigreturn
587 .long sys_rt_sigaction
588 .long sys_rt_sigprocmask /* 175 */
589 .long sys_rt_sigpending
590 .long sys_rt_sigtimedwait
591 .long sys_rt_sigqueueinfo
592 .long sys_rt_sigsuspend
593 .long sys_pread64 /* 180 */
598 .long sys_capset /* 185 */
599 .long sys_sigaltstack
601 .long sys_ni_syscall /* streams1 */
602 .long sys_ni_syscall /* streams2 */
603 .long sys_vfork /* 190 */
607 .long sys_ftruncate64
608 .long sys_stat64 /* 195 */
613 .long sys_getgid /* 200 */
618 .long sys_getgroups /* 205 */
623 .long sys_setresgid /* 210 */
628 .long sys_setfsuid /* 215 */
633 .long sys_getdents64 /* 220 */
638 .long sys_fsetxattr /* 225 */
643 .long sys_llistxattr /* 230 */
645 .long sys_removexattr
646 .long sys_lremovexattr
647 .long sys_fremovexattr
648 .long sys_futex /* 235 */
653 .long sys_readahead /* 240 */
656 .long sys_io_getevents
658 .long sys_io_cancel /* 245 */
661 .long sys_lookup_dcookie
662 .long sys_epoll_create
663 .long sys_epoll_ctl /* 250 */
665 .long sys_remap_file_pages
666 .long sys_set_tid_address
667 .long sys_timer_create
668 .long sys_timer_settime /* 255 */
669 .long sys_timer_gettime
670 .long sys_timer_getoverrun
671 .long sys_timer_delete
672 .long sys_clock_settime
673 .long sys_clock_gettime /* 260 */
674 .long sys_clock_getres
675 .long sys_clock_nanosleep
678 .long sys_tgkill /* 265 */
680 .long sys_fadvise64_64
682 .long sys_get_mempolicy
683 .long sys_set_mempolicy /* 270 */
686 .long sys_mq_timedsend
687 .long sys_mq_timedreceive
688 .long sys_mq_notify /* 275 */
689 .long sys_mq_getsetattr
691 .long sys_ni_syscall /* for sys_vserver */
693 .long sys_request_key /* 280 */
697 .long sys_inotify_init
698 .long sys_inotify_add_watch /* 285 */
699 .long sys_inotify_rm_watch
700 .long sys_migrate_pages
703 .long sys_mknodat /* 290 */
708 .long sys_renameat /* 295 */
713 .long sys_faccessat /* 300 */
714 .long sys_ni_syscall /* Reserved for pselect6 */
715 .long sys_ni_syscall /* Reserved for ppoll */
717 .long sys_set_robust_list
718 .long sys_get_robust_list /* 305 */
720 .long sys_sync_file_range
723 .long sys_move_pages /* 310 */
724 .long sys_sched_setaffinity
725 .long sys_sched_getaffinity
728 .long sys_epoll_pwait /* 315 */
731 .long sys_timerfd_create
733 .long sys_fallocate /* 320 */
734 .long sys_timerfd_settime
735 .long sys_timerfd_gettime
738 .long sys_epoll_create1 /* 325 */
741 .long sys_inotify_init1
743 .long sys_pwritev /* 330 */
744 .long sys_rt_tgsigqueueinfo
745 .long sys_perf_event_open
746 .long sys_get_thread_area
747 .long sys_set_thread_area
748 .long sys_atomic_cmpxchg_32 /* 335 */
749 .long sys_atomic_barrier
750 .long sys_fanotify_init
751 .long sys_fanotify_mark