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/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>
45 #include <asm/asm-offsets.h>
47 .globl system_call, buserr, trap, resume
49 .globl sys_fork, sys_clone, sys_vfork
50 .globl ret_from_interrupt, bad_interrupt
51 .globl auto_irqhandler_fixup
52 .globl user_irqvec_fixup, user_irqhandler_fixup
58 movel %sp,%sp@- | stack frame pointer argument
61 jra .Lret_from_exception
66 movel %sp,%sp@- | stack frame pointer argument
69 jra .Lret_from_exception
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
78 jra .Lret_from_exception
81 movel #-ENOSYS,%sp@(PT_D0) | needed for strace
87 movel %sp@(PT_ORIG_D0),%d0
91 movel #-ENOSYS,%sp@(PT_D0)
100 jra .Lret_from_exception
102 ENTRY(ret_from_signal)
105 /* on 68040 complete pending writebacks if any */
107 bfextu %sp@(PT_VECTOR){#0,#4},%d0
108 subql #7,%d0 | bus error frame ?
115 jra .Lret_from_exception
122 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
125 tstb %curptr@(TASK_INFO+TINFO_FLAGS+2)
127 cmpl #NR_syscalls,%d0
130 jbsr @(sys_call_table,%d0:l:4)@(0)
131 movel %d0,%sp@(PT_D0) | save the return value
134 movew %curptr@(TASK_INFO+TINFO_FLAGS+2),%d0
135 jne syscall_exit_work
139 btst #5,%sp@(PT_SR) | check if returning to kernel
140 bnes 1b | if so, skip resched, signals
150 ENTRY(ret_from_exception)
151 .Lret_from_exception:
152 btst #5,%sp@(PT_SR) | check if returning to kernel
153 bnes 1f | if so, skip resched, signals
154 | only allow interrupts when we are really the last one on the
155 | kernel stack, otherwise stack overflow can occur during
156 | heavy interrupt load
160 moveb %curptr@(TASK_INFO+TINFO_FLAGS+3),%d0
166 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
175 subql #4,%sp | dummy return address
177 pea %sp@(SWITCH_STACK_SIZE)
183 jbra resume_userspace
186 bclr #7,%sp@(PT_SR) | clear trace bit in SR
193 jbra resume_userspace
196 /* This is the main interrupt handler for autovector interrupts */
198 ENTRY(auto_inthandler)
201 addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
202 | put exception # in d0
203 bfextu %sp@(PT_VECTOR){#4,#10},%d0
207 movel %d0,%sp@- | put vector # on stack
208 auto_irqhandler_fixup = . + 2
209 jsr m68k_handle_int | process the IRQ
210 addql #8,%sp | pop parameters off stack
213 subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
214 jeq ret_from_last_interrupt
218 ret_from_last_interrupt:
219 moveq #(~ALLOWINT>>8)&0xff,%d0
223 /* check if we need to do software interrupts */
224 tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
225 jeq .Lret_from_exception
226 pea ret_from_exception
229 /* Handler for user defined interrupt vectors */
231 ENTRY(user_inthandler)
234 addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
235 | put exception # in d0
236 bfextu %sp@(PT_VECTOR){#4,#10},%d0
237 user_irqvec_fixup = . + 2
241 movel %d0,%sp@- | put vector # on stack
242 user_irqhandler_fixup = . + 2
243 jsr m68k_handle_int | process the IRQ
244 addql #8,%sp | pop parameters off stack
246 subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
247 jeq ret_from_last_interrupt
250 /* Handler for uninitialized and spurious interrupts */
252 ENTRY(bad_inthandler)
255 addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
261 subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
262 jeq ret_from_last_interrupt
268 pea %sp@(SWITCH_STACK_SIZE)
276 pea %sp@(SWITCH_STACK_SIZE)
284 pea %sp@(SWITCH_STACK_SIZE)
290 ENTRY(sys_sigsuspend)
292 pea %sp@(SWITCH_STACK_SIZE)
298 ENTRY(sys_rt_sigsuspend)
300 pea %sp@(SWITCH_STACK_SIZE)
301 jbsr do_rt_sigsuspend
312 ENTRY(sys_rt_sigreturn)
320 * Beware - when entering resume, prev (the current task) is
321 * in a0, next (the new task) is in a1,so don't change these
322 * registers until their contents are no longer needed.
326 movew %sr,%a0@(TASK_THREAD+THREAD_SR)
328 /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
330 movew %d0,%a0@(TASK_THREAD+THREAD_FS)
333 /* it is better to use a movel here instead of a movew 8*) */
335 movel %d0,%a0@(TASK_THREAD+THREAD_USP)
337 /* save non-scratch registers on stack */
340 /* save current kernel stack pointer */
341 movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
343 /* save floating point context */
344 #ifndef CONFIG_M68KFPU_EMU_ONLY
345 #ifdef CONFIG_M68KFPU_EMU
349 fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
351 #if defined(CONFIG_M68060)
352 #if !defined(CPU_M68060_ONLY)
353 btst #3,m68k_cputype+3
356 /* The 060 FPU keeps status in bits 15-8 of the first longword */
357 tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
359 #if !defined(CPU_M68060_ONLY)
362 #endif /* CONFIG_M68060 */
363 #if !defined(CPU_M68060_ONLY)
364 1: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
367 2: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
368 fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
370 #endif /* CONFIG_M68KFPU_EMU_ONLY */
371 /* Return previous task in %d1 */
374 /* switch to new task (a1 contains new task) */
377 /* restore floating point context */
378 #ifndef CONFIG_M68KFPU_EMU_ONLY
379 #ifdef CONFIG_M68KFPU_EMU
383 #if defined(CONFIG_M68060)
384 #if !defined(CPU_M68060_ONLY)
385 btst #3,m68k_cputype+3
388 /* The 060 FPU keeps status in bits 15-8 of the first longword */
389 tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
391 #if !defined(CPU_M68060_ONLY)
394 #endif /* CONFIG_M68060 */
395 #if !defined(CPU_M68060_ONLY)
396 1: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
399 2: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
400 fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
401 3: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
403 #endif /* CONFIG_M68KFPU_EMU_ONLY */
405 /* restore the kernel stack pointer */
406 movel %a1@(TASK_THREAD+THREAD_KSP),%sp
408 /* restore non-scratch registers */
411 /* restore user stack pointer */
412 movel %a1@(TASK_THREAD+THREAD_USP),%a0
415 /* restore fs (sfc,%dfc) */
416 movew %a1@(TASK_THREAD+THREAD_FS),%a0
420 /* restore status register */
421 movew %a1@(TASK_THREAD+THREAD_SR),%sr
428 .long sys_ni_syscall /* 0 - old "setup()" system call*/
433 .long sys_open /* 5 */
438 .long sys_unlink /* 10 */
443 .long sys_chmod /* 15 */
445 .long sys_ni_syscall /* old break syscall holder */
448 .long sys_getpid /* 20 */
453 .long sys_stime /* 25 */
458 .long sys_utime /* 30 */
459 .long sys_ni_syscall /* old stty syscall holder */
460 .long sys_ni_syscall /* old gtty syscall holder */
463 .long sys_ni_syscall /* 35 */ /* old ftime syscall holder */
468 .long sys_rmdir /* 40 */
472 .long sys_ni_syscall /* old prof syscall holder */
473 .long sys_brk /* 45 */
478 .long sys_getegid16 /* 50 */
480 .long sys_umount /* recycled never used phys() */
481 .long sys_ni_syscall /* old lock syscall holder */
483 .long sys_fcntl /* 55 */
484 .long sys_ni_syscall /* old mpx syscall holder */
486 .long sys_ni_syscall /* old ulimit syscall holder */
488 .long sys_umask /* 60 */
493 .long sys_getpgrp /* 65 */
498 .long sys_setreuid16 /* 70 */
502 .long sys_sethostname
503 .long sys_setrlimit /* 75 */
504 .long sys_old_getrlimit
506 .long sys_gettimeofday
507 .long sys_settimeofday
508 .long sys_getgroups16 /* 80 */
509 .long sys_setgroups16
513 .long sys_readlink /* 85 */
518 .long old_mmap /* 90 */
523 .long sys_fchown16 /* 95 */
524 .long sys_getpriority
525 .long sys_setpriority
526 .long sys_ni_syscall /* old profil syscall holder */
528 .long sys_fstatfs /* 100 */
529 .long sys_ni_syscall /* ioperm for i386 */
533 .long sys_getitimer /* 105 */
538 .long sys_ni_syscall /* 110 */ /* iopl for i386 */
540 .long sys_ni_syscall /* obsolete idle() syscall */
541 .long sys_ni_syscall /* vm86old for i386 */
543 .long sys_swapoff /* 115 */
548 .long sys_clone /* 120 */
549 .long sys_setdomainname
551 .long sys_cacheflush /* modify_ldt for i386 */
553 .long sys_mprotect /* 125 */
554 .long sys_sigprocmask
555 .long sys_ni_syscall /* old "create_module" */
556 .long sys_init_module
557 .long sys_delete_module
558 .long sys_ni_syscall /* 130 - old "get_kernel_syms" */
563 .long sys_sysfs /* 135 */
564 .long sys_personality
565 .long sys_ni_syscall /* for afs_syscall */
568 .long sys_llseek /* 140 */
573 .long sys_readv /* 145 */
578 .long sys_mlock /* 150 */
582 .long sys_sched_setparam
583 .long sys_sched_getparam /* 155 */
584 .long sys_sched_setscheduler
585 .long sys_sched_getscheduler
586 .long sys_sched_yield
587 .long sys_sched_get_priority_max
588 .long sys_sched_get_priority_min /* 160 */
589 .long sys_sched_rr_get_interval
592 .long sys_setresuid16
593 .long sys_getresuid16 /* 165 */
594 .long sys_getpagesize
595 .long sys_ni_syscall /* old sys_query_module */
598 .long sys_setresgid16 /* 170 */
599 .long sys_getresgid16
601 .long sys_rt_sigreturn
602 .long sys_rt_sigaction
603 .long sys_rt_sigprocmask /* 175 */
604 .long sys_rt_sigpending
605 .long sys_rt_sigtimedwait
606 .long sys_rt_sigqueueinfo
607 .long sys_rt_sigsuspend
608 .long sys_pread64 /* 180 */
613 .long sys_capset /* 185 */
614 .long sys_sigaltstack
616 .long sys_ni_syscall /* streams1 */
617 .long sys_ni_syscall /* streams2 */
618 .long sys_vfork /* 190 */
622 .long sys_ftruncate64
623 .long sys_stat64 /* 195 */
628 .long sys_getgid /* 200 */
633 .long sys_getgroups /* 205 */
638 .long sys_setresgid /* 210 */
643 .long sys_setfsuid /* 215 */
648 .long sys_getdents64 /* 220 */
653 .long sys_fsetxattr /* 225 */
658 .long sys_llistxattr /* 230 */
660 .long sys_removexattr
661 .long sys_lremovexattr
662 .long sys_fremovexattr
663 .long sys_futex /* 235 */
668 .long sys_readahead /* 240 */
671 .long sys_io_getevents
673 .long sys_io_cancel /* 245 */
676 .long sys_lookup_dcookie
677 .long sys_epoll_create
678 .long sys_epoll_ctl /* 250 */
680 .long sys_remap_file_pages
681 .long sys_set_tid_address
682 .long sys_timer_create
683 .long sys_timer_settime /* 255 */
684 .long sys_timer_gettime
685 .long sys_timer_getoverrun
686 .long sys_timer_delete
687 .long sys_clock_settime
688 .long sys_clock_gettime /* 260 */
689 .long sys_clock_getres
690 .long sys_clock_nanosleep
693 .long sys_tgkill /* 265 */
695 .long sys_fadvise64_64
697 .long sys_get_mempolicy
698 .long sys_set_mempolicy /* 270 */
701 .long sys_mq_timedsend
702 .long sys_mq_timedreceive
703 .long sys_mq_notify /* 275 */
704 .long sys_mq_getsetattr
706 .long sys_ni_syscall /* for sys_vserver */
708 .long sys_request_key /* 280 */