/* -*- mode: asm -*-
*
* linux/arch/m68k/kernel/entry.S
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file README.legal in the main directory of this archive
* for more details.
*
* Linux/m68k support by Hamish Macdonald
*
* 68060 fixes by Jesper Skov
*
*/
/*
* entry.S contains the system-call and fault low-level handling routines.
* This also contains the timer-interrupt handler, as well as all interrupts
* and faults that can result in a task-switch.
*
* NOTE: This code handles signal-recognition, which happens every time
* after a timer-interrupt and after each system call.
*
*/
/*
* 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
* all pointers that used to be 'current' are now entry
* number 0 in the 'current_set' list.
*/
#include <linux/sys.h>
#include <linux/config.h>
#include <linux/linkage.h>
#include <asm/entry.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/traps.h>
#include "m68k_defs.h"
.globl SYMBOL_NAME(system_call), SYMBOL_NAME(buserr), SYMBOL_NAME(trap)
.globl SYMBOL_NAME(resume), SYMBOL_NAME(ret_from_exception)
.globl SYMBOL_NAME(ret_from_signal)
.globl SYMBOL_NAME(inthandler), SYMBOL_NAME(sys_call_table)
.globl SYMBOL_NAME(sys_fork), SYMBOL_NAME(sys_clone), SYMBOL_NAME(sys_vfork)
.globl SYMBOL_NAME(ret_from_interrupt), SYMBOL_NAME(bad_interrupt)
.text
ENTRY(buserr)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %sp,%sp@- | stack frame pointer argument
bsrl SYMBOL_NAME(buserr_c)
addql #4,%sp
jra SYMBOL_NAME(ret_from_exception)
ENTRY(trap)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %sp,%sp@- | stack frame pointer argument
bsrl SYMBOL_NAME(trap_c)
addql #4,%sp
jra SYMBOL_NAME(ret_from_exception)
ENTRY(reschedule)
| save top of frame
movel %sp,%curptr@(TASK_TSS+TSS_ESP0)
pea SYMBOL_NAME(ret_from_exception)
jmp SYMBOL_NAME(schedule)
badsys:
movel #-ENOSYS,PT_D0(%sp)
jra SYMBOL_NAME(ret_from_exception)
do_trace:
movel #-ENOSYS,PT_D0(%sp) | needed for strace
subql #4,%sp
SAVE_SWITCH_STACK
jbsr SYMBOL_NAME(syscall_trace)
RESTORE_SWITCH_STACK
addql #4,%sp
jbsr @(SYMBOL_NAME(sys_call_table),%d2:l:4)@(0)
movel %d0,%sp@(PT_D0) | save the return value
subql #4,%sp | dummy return address
SAVE_SWITCH_STACK
jbsr SYMBOL_NAME(syscall_trace)
SYMBOL_NAME_LABEL(ret_from_signal)
RESTORE_SWITCH_STACK
addql #4,%sp
jra SYMBOL_NAME(ret_from_exception)
ENTRY(system_call)
SAVE_ALL_SYS
movel %d0,%d2
GET_CURRENT(%d0)
| save top of frame
movel %sp,%curptr@(TASK_TSS+TSS_ESP0)
cmpl #NR_syscalls,%d2
jcc badsys
btst #PF_TRACESYS_BIT,%curptr@(TASK_FLAGS+PF_TRACESYS_OFF)
jne do_trace
jbsr @(SYMBOL_NAME(sys_call_table),%d2:l:4)@(0)
movel %d0,%sp@(PT_D0) | save the return value
SYMBOL_NAME_LABEL(ret_from_exception)
btst #5,%sp@(PT_SR) | check if returning to kernel
bnes 2f | if so, skip resched, signals
| only allow interrupts when we are really the last one on the
| kernel stack, otherwise stack overflow can occur during
| heavy interupt load
andw #ALLOWINT,%sr
tstl %curptr@(TASK_NEEDRESCHED)
jne SYMBOL_NAME(reschedule)
cmpl #SYMBOL_NAME(task),%curptr | task[0] cannot have signals
jeq 2f
| check for delayed trace
bclr #PF_DTRACE_BIT,%curptr@(TASK_FLAGS+PF_DTRACE_OFF)
jne do_delayed_trace
5:
tstl %curptr@(TASK_STATE) | state
jne SYMBOL_NAME(reschedule)
tstl %curptr@(TASK_SIGPENDING)
jne Lsignal_return
2: RESTORE_ALL
Lsignal_return:
subql #4,%sp | dummy return address
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
clrl %sp@-
bsrl SYMBOL_NAME(do_signal)
addql #8,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
RESTORE_ALL
do_delayed_trace:
bclr #7,%sp@(PT_SR) | clear trace bit in SR
pea 1 | send SIGTRAP
movel %curptr,%sp@-
pea LSIGTRAP
jbsr SYMBOL_NAME(send_sig)
addql #8,%sp
addql #4,%sp
jra 5b
/*
** This is the main interrupt handler, responsible for calling process_int()
*/
SYMBOL_NAME_LABEL(inthandler)
SAVE_ALL_INT
GET_CURRENT(%d0)
addql #1,SYMBOL_NAME(local_irq_count)
| put exception # in d0
bfextu %sp@(PT_VECTOR){#4,#10},%d0
movel %sp,%sp@-
movel %d0,%sp@- | put vector # on stack
jbsr SYMBOL_NAME(process_int)| process the IRQ
addql #8,%sp | pop parameters off stack
SYMBOL_NAME_LABEL(ret_from_interrupt)
subql #1,SYMBOL_NAME(local_irq_count)
jeq 1f
2:
RESTORE_ALL
1:
#if 1
bfextu %sp@(PT_SR){#5,#3},%d0 | Check for nested interrupt.
#if MAX_NOINT_IPL > 0
cmpiw #MAX_NOINT_IPL,%d0
#endif
jhi 2b
#endif
/* check if we need to do software interrupts */
movel SYMBOL_NAME(bh_active),%d0
andl SYMBOL_NAME(bh_mask),%d0
jeq SYMBOL_NAME(ret_from_exception)
pea SYMBOL_NAME(ret_from_exception)
jra SYMBOL_NAME(do_bottom_half)
/* Handler for uninitialized and spurious interrupts */
SYMBOL_NAME_LABEL(bad_interrupt)
addql #1,SYMBOL_NAME(num_spurious)
rte
ENTRY(sys_fork)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr SYMBOL_NAME(m68k_fork)
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_clone)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr SYMBOL_NAME(m68k_clone)
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_vfork)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr SYMBOL_NAME(m68k_vfork)
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_sigsuspend)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr SYMBOL_NAME(do_sigsuspend)
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_rt_sigsuspend)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr SYMBOL_NAME(do_rt_sigsuspend)
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_sigreturn)
SAVE_SWITCH_STACK
jbsr SYMBOL_NAME(do_sigreturn)
RESTORE_SWITCH_STACK
rts
ENTRY(sys_rt_sigreturn)
SAVE_SWITCH_STACK
jbsr SYMBOL_NAME(do_rt_sigreturn)
RESTORE_SWITCH_STACK
rts
SYMBOL_NAME_LABEL(resume)
/*
* Beware - when entering resume, prev (the current task) is
* in a0, next (the new task) is in a1,so don't change these
* registers until their contents are no longer needed.
*/
/* save sr */
movew %sr,%a0@(TASK_TSS+TSS_SR)
/* save fs (sfc,%dfc) (may be pointing to kernel memory) */
movec %sfc,%d0
movew %d0,%a0@(TASK_TSS+TSS_FS)
/* save usp */
/* it is better to use a movel here instead of a movew 8*) */
movec %usp,%d0
movel %d0,%a0@(TASK_TSS+TSS_USP)
/* save non-scratch registers on stack */
SAVE_SWITCH_STACK
/* save current kernel stack pointer */
movel %sp,%a0@(TASK_TSS+TSS_KSP)
/* save floating point context */
fsave %a0@(TASK_TSS+TSS_FPSTATE)
#if defined(CONFIG_M68060)
#if !defined(CPU_M68060_ONLY)
btst #3,SYMBOL_NAME(m68k_cputype)+3
beqs 1f
#endif
/* The 060 FPU keeps status in bits 15-8 of the first longword */
tstb %a0@(TASK_TSS+TSS_FPSTATE+2)
jeq 3f
#if !defined(CPU_M68060_ONLY)
jra 2f
#endif
#endif /* CONFIG_M68060 */
#if !defined(CPU_M68060_ONLY)
1: tstb %a0@(TASK_TSS+TSS_FPSTATE)
jeq 3f
#endif
2: fmovemx %fp0-%fp7,%a0@(TASK_TSS+TSS_FPREG)
fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_TSS+TSS_FPCNTL)
3:
/* switch to new task (a1 contains new task) */
movel %a1,%curptr
/* Skip address space switching if they are the same. */
movel %a0@(TASK_MM),%d0
cmpl %a1@(TASK_MM),%d0
jeq 4f
#if defined(CPU_M68020_OR_M68030) && defined(CPU_M68040_OR_M68060)
/* 68040 or 68060 ? */
tstl SYMBOL_NAME(m68k_is040or060)
bnes 1f
#endif
#if defined(CPU_M68020_OR_M68030)
/*
* switch address space
*/
/* flush MC68030/MC68020 caches (they are virtually addressed) */
movec %cacr,%d0
oriw #LFLUSH_I_AND_D,%d0
movec %d0,%cacr
/* switch the root pointer */
pmove %a1@(TASK_TSS+TSS_CRP),%crp
#endif
#if defined(CPU_M68020_OR_M68030) && defined(CPU_M68040_OR_M68060)
jra 2f /* skip m68040 stuff */
1:
#endif
#if defined(CPU_M68040_OR_M68060)
/*
* switch address space
*/
.chip 68040
/* flush address translation cache (user entries) */
pflushan
/* switch the root pointer */
movel %a1@(TASK_TSS+TSS_CRP+4),%d0
movec %d0,%urp
#if defined (CONFIG_M68060)
/* is it a '060 ? */
#if !defined(CPU_M68060_ONLY)
btst #3,SYMBOL_NAME(m68k_cputype)+3
beqs 2f
#endif
/* clear user entries in the branch cache */
movec %cacr,%d0
orl #0x00200000,%d0
movec %d0,%cacr
#endif /* CONFIG_M68060 */
.chip 68k
#endif /* CPU_M68040_OR_M68060 */
2:
4:
/* restore floating point context */
#if defined(CONFIG_M68060)
#if !defined(CPU_M68060_ONLY)
btst #3,SYMBOL_NAME(m68k_cputype)+3
beqs 1f
#endif
/* The 060 FPU keeps status in bits 15-8 of the first longword */
tstb %a1@(TASK_TSS+TSS_FPSTATE+2)
jeq 3f
#if !defined(CPU_M68060_ONLY)
jra 2f
#endif
#endif /* CONFIG_M68060 */
#if !defined(CPU_M68060_ONLY)
1: tstb %a1@(TASK_TSS+TSS_FPSTATE)
jeq 3f
#endif
2: fmovemx %a1@(TASK_TSS+TSS_FPREG),%fp0-%fp7
fmoveml %a1@(TASK_TSS+TSS_FPCNTL),%fpcr/%fpsr/%fpiar
3: frestore %a1@(TASK_TSS+TSS_FPSTATE)
/* restore the kernel stack pointer */
movel %a1@(TASK_TSS+TSS_KSP),%sp
/* restore non-scratch registers */
RESTORE_SWITCH_STACK
/* restore user stack pointer */
movel %a1@(TASK_TSS+TSS_USP),%a0
movel %a0,%usp
/* restore fs (sfc,%dfc) */
movew %a1@(TASK_TSS+TSS_FS),%a0
movec %a0,%sfc
movec %a0,%dfc
/* restore status register */
movew %a1@(TASK_TSS+TSS_SR),%sr
rts
.data
ALIGN
SYMBOL_NAME_LABEL(sys_call_table)
.long SYMBOL_NAME(sys_ni_syscall) /* 0 - old "setup()" system call*/
.long SYMBOL_NAME(sys_exit)
.long SYMBOL_NAME(sys_fork)
.long SYMBOL_NAME(sys_read)
.long SYMBOL_NAME(sys_write)
.long SYMBOL_NAME(sys_open) /* 5 */
.long SYMBOL_NAME(sys_close)
.long SYMBOL_NAME(sys_waitpid)
.long SYMBOL_NAME(sys_creat)
.long SYMBOL_NAME(sys_link)
.long SYMBOL_NAME(sys_unlink) /* 10 */
.long SYMBOL_NAME(sys_execve)
.long SYMBOL_NAME(sys_chdir)
.long SYMBOL_NAME(sys_time)
.long SYMBOL_NAME(sys_mknod)
.long SYMBOL_NAME(sys_chmod) /* 15 */
.long SYMBOL_NAME(sys_chown)
.long SYMBOL_NAME(sys_ni_syscall) /* old break syscall holder */
.long SYMBOL_NAME(sys_stat)
.long SYMBOL_NAME(sys_lseek)
.long SYMBOL_NAME(sys_getpid) /* 20 */
.long SYMBOL_NAME(sys_mount)
.long SYMBOL_NAME(sys_oldumount)
.long SYMBOL_NAME(sys_setuid)
.long SYMBOL_NAME(sys_getuid)
.long SYMBOL_NAME(sys_stime) /* 25 */
.long SYMBOL_NAME(sys_ptrace)
.long SYMBOL_NAME(sys_alarm)
.long SYMBOL_NAME(sys_fstat)
.long SYMBOL_NAME(sys_pause)
.long SYMBOL_NAME(sys_utime) /* 30 */
.long SYMBOL_NAME(sys_ni_syscall) /* old stty syscall holder */
.long SYMBOL_NAME(sys_ni_syscall) /* old gtty syscall holder */
.long SYMBOL_NAME(sys_access)
.long SYMBOL_NAME(sys_nice)
.long SYMBOL_NAME(sys_ni_syscall) /* 35 */ /* old ftime syscall holder */
.long SYMBOL_NAME(sys_sync)
.long SYMBOL_NAME(sys_kill)
.long SYMBOL_NAME(sys_rename)
.long SYMBOL_NAME(sys_mkdir)
.long SYMBOL_NAME(sys_rmdir) /* 40 */
.long SYMBOL_NAME(sys_dup)
.long SYMBOL_NAME(sys_pipe)
.long SYMBOL_NAME(sys_times)
.long SYMBOL_NAME(sys_ni_syscall) /* old prof syscall holder */
.long SYMBOL_NAME(sys_brk) /* 45 */
.long SYMBOL_NAME(sys_setgid)
.long SYMBOL_NAME(sys_getgid)
.long SYMBOL_NAME(sys_signal)
.long SYMBOL_NAME(sys_geteuid)
.long SYMBOL_NAME(sys_getegid) /* 50 */
.long SYMBOL_NAME(sys_acct)
.long SYMBOL_NAME(sys_umount) /* recycled never used phys() */
.long SYMBOL_NAME(sys_ni_syscall) /* old lock syscall holder */
.long SYMBOL_NAME(sys_ioctl)
.long SYMBOL_NAME(sys_fcntl) /* 55 */
.long SYMBOL_NAME(sys_ni_syscall) /* old mpx syscall holder */
.long SYMBOL_NAME(sys_setpgid)
.long SYMBOL_NAME(sys_ni_syscall) /* old ulimit syscall holder */
.long SYMBOL_NAME(sys_ni_syscall)
.long SYMBOL_NAME(sys_umask) /* 60 */
.long SYMBOL_NAME(sys_chroot)
.long SYMBOL_NAME(sys_ustat)
.long SYMBOL_NAME(sys_dup2)
.long SYMBOL_NAME(sys_getppid)
.long SYMBOL_NAME(sys_getpgrp) /* 65 */
.long SYMBOL_NAME(sys_setsid)
.long SYMBOL_NAME(sys_sigaction)
.long SYMBOL_NAME(sys_sgetmask)
.long SYMBOL_NAME(sys_ssetmask)
.long SYMBOL_NAME(sys_setreuid) /* 70 */
.long SYMBOL_NAME(sys_setregid)
.long SYMBOL_NAME(sys_sigsuspend)
.long SYMBOL_NAME(sys_sigpending)
.long SYMBOL_NAME(sys_sethostname)
.long SYMBOL_NAME(sys_setrlimit) /* 75 */
.long SYMBOL_NAME(sys_getrlimit)
.long SYMBOL_NAME(sys_getrusage)
.long SYMBOL_NAME(sys_gettimeofday)
.long SYMBOL_NAME(sys_settimeofday)
.long SYMBOL_NAME(sys_getgroups) /* 80 */
.long SYMBOL_NAME(sys_setgroups)
.long SYMBOL_NAME(old_select)
.long SYMBOL_NAME(sys_symlink)
.long SYMBOL_NAME(sys_lstat)
.long SYMBOL_NAME(sys_readlink) /* 85 */
.long SYMBOL_NAME(sys_uselib)
.long SYMBOL_NAME(sys_swapon)
.long SYMBOL_NAME(sys_reboot)
.long SYMBOL_NAME(old_readdir)
.long SYMBOL_NAME(old_mmap) /* 90 */
.long SYMBOL_NAME(sys_munmap)
.long SYMBOL_NAME(sys_truncate)
.long SYMBOL_NAME(sys_ftruncate)
.long SYMBOL_NAME(sys_fchmod)
.long SYMBOL_NAME(sys_fchown) /* 95 */
.long SYMBOL_NAME(sys_getpriority)
.long SYMBOL_NAME(sys_setpriority)
.long SYMBOL_NAME(sys_ni_syscall) /* old profil syscall holder */
.long SYMBOL_NAME(sys_statfs)
.long SYMBOL_NAME(sys_fstatfs) /* 100 */
.long SYMBOL_NAME(sys_ioperm)
.long SYMBOL_NAME(sys_socketcall)
.long SYMBOL_NAME(sys_syslog)
.long SYMBOL_NAME(sys_setitimer)
.long SYMBOL_NAME(sys_getitimer) /* 105 */
.long SYMBOL_NAME(sys_newstat)
.long SYMBOL_NAME(sys_newlstat)
.long SYMBOL_NAME(sys_newfstat)
.long SYMBOL_NAME(sys_ni_syscall)
.long SYMBOL_NAME(sys_ni_syscall) /* iopl for i386 */ /* 110 */
.long SYMBOL_NAME(sys_vhangup)
.long SYMBOL_NAME(sys_idle)
.long SYMBOL_NAME(sys_ni_syscall) /* vm86old for i386 */
.long SYMBOL_NAME(sys_wait4)
.long SYMBOL_NAME(sys_swapoff) /* 115 */
.long SYMBOL_NAME(sys_sysinfo)
.long SYMBOL_NAME(sys_ipc)
.long SYMBOL_NAME(sys_fsync)
.long SYMBOL_NAME(sys_sigreturn)
.long SYMBOL_NAME(sys_clone) /* 120 */
.long SYMBOL_NAME(sys_setdomainname)
.long SYMBOL_NAME(sys_newuname)
.long SYMBOL_NAME(sys_cacheflush) /* modify_ldt for i386 */
.long SYMBOL_NAME(sys_adjtimex)
.long SYMBOL_NAME(sys_mprotect) /* 125 */
.long SYMBOL_NAME(sys_sigprocmask)
.long SYMBOL_NAME(sys_create_module)
.long SYMBOL_NAME(sys_init_module)
.long SYMBOL_NAME(sys_delete_module)
.long SYMBOL_NAME(sys_get_kernel_syms) /* 130 */
.long SYMBOL_NAME(sys_quotactl)
.long SYMBOL_NAME(sys_getpgid)
.long SYMBOL_NAME(sys_fchdir)
.long SYMBOL_NAME(sys_bdflush)
.long SYMBOL_NAME(sys_sysfs) /* 135 */
.long SYMBOL_NAME(sys_personality)
.long SYMBOL_NAME(sys_ni_syscall) /* for afs_syscall */
.long SYMBOL_NAME(sys_setfsuid)
.long SYMBOL_NAME(sys_setfsgid)
.long SYMBOL_NAME(sys_llseek) /* 140 */
.long SYMBOL_NAME(sys_getdents)
.long SYMBOL_NAME(sys_select)
.long SYMBOL_NAME(sys_flock)
.long SYMBOL_NAME(sys_msync)
.long SYMBOL_NAME(sys_readv) /* 145 */
.long SYMBOL_NAME(sys_writev)
.long SYMBOL_NAME(sys_getsid)
.long SYMBOL_NAME(sys_fdatasync)
.long SYMBOL_NAME(sys_sysctl)
.long SYMBOL_NAME(sys_mlock) /* 150 */
.long SYMBOL_NAME(sys_munlock)
.long SYMBOL_NAME(sys_mlockall)
.long SYMBOL_NAME(sys_munlockall)
.long SYMBOL_NAME(sys_sched_setparam)
.long SYMBOL_NAME(sys_sched_getparam) /* 155 */
.long SYMBOL_NAME(sys_sched_setscheduler)
.long SYMBOL_NAME(sys_sched_getscheduler)
.long SYMBOL_NAME(sys_sched_yield)
.long SYMBOL_NAME(sys_sched_get_priority_max)
.long SYMBOL_NAME(sys_sched_get_priority_min) /* 160 */
.long SYMBOL_NAME(sys_sched_rr_get_interval)
.long SYMBOL_NAME(sys_nanosleep)
.long SYMBOL_NAME(sys_mremap)
.long SYMBOL_NAME(sys_setresuid)
.long SYMBOL_NAME(sys_getresuid) /* 165 */
.long SYMBOL_NAME(sys_ni_syscall) /* for vm86 */
.long SYMBOL_NAME(sys_query_module)
.long SYMBOL_NAME(sys_poll)
.long SYMBOL_NAME(sys_nfsservctl)
.long SYMBOL_NAME(sys_setresgid) /* 170 */
.long SYMBOL_NAME(sys_getresgid)
.long SYMBOL_NAME(sys_prctl)
.long SYMBOL_NAME(sys_rt_sigreturn)
.long SYMBOL_NAME(sys_rt_sigaction)
.long SYMBOL_NAME(sys_rt_sigprocmask) /* 175 */
.long SYMBOL_NAME(sys_rt_sigpending)
.long SYMBOL_NAME(sys_rt_sigtimedwait)
.long SYMBOL_NAME(sys_rt_sigqueueinfo)
.long SYMBOL_NAME(sys_rt_sigsuspend)
.long SYMBOL_NAME(sys_pread) /* 180 */
.long SYMBOL_NAME(sys_pwrite)
.long SYMBOL_NAME(sys_lchown);
.long SYMBOL_NAME(sys_getcwd)
.long SYMBOL_NAME(sys_capget)
.long SYMBOL_NAME(sys_capset) /* 185 */
.long SYMBOL_NAME(sys_sigaltstack)
.long SYMBOL_NAME(sys_sendfile)
.long SYMBOL_NAME(sys_ni_syscall) /* streams1 */
.long SYMBOL_NAME(sys_ni_syscall) /* streams2 */
.long SYMBOL_NAME(sys_vfork) /* 190 */
.rept NR_syscalls-(.-SYMBOL_NAME(sys_call_table))/4
.long SYMBOL_NAME(sys_ni_syscall)
.endr
