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-###############################################################################
-#
-# MN10300 Exception and interrupt entry points
-#
-# Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
-# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
-# Modified by David Howells (dhowells@redhat.com)
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public Licence
-# as published by the Free Software Foundation; either version
-# 2 of the Licence, or (at your option) any later version.
-#
-###############################################################################
-#include <linux/sys.h>
-#include <linux/linkage.h>
-#include <asm/smp.h>
-#include <asm/irqflags.h>
-#include <asm/thread_info.h>
-#include <asm/intctl-regs.h>
-#include <asm/busctl-regs.h>
-#include <asm/timer-regs.h>
-#include <unit/leds.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/errno.h>
-#include <asm/asm-offsets.h>
-#include <asm/frame.inc>
-
-#if defined(CONFIG_SMP) && defined(CONFIG_GDBSTUB)
-#include <asm/gdb-stub.h>
-#endif /* CONFIG_SMP && CONFIG_GDBSTUB */
-
-#ifdef CONFIG_PREEMPT
-#define preempt_stop LOCAL_IRQ_DISABLE
-#else
-#define preempt_stop
-#define resume_kernel restore_all
-#endif
-
- .am33_2
-
-###############################################################################
-#
-# the return path for a forked child
-# - on entry, D0 holds the address of the previous task to run
-#
-###############################################################################
-ENTRY(ret_from_fork)
- call schedule_tail[],0
- GET_THREAD_INFO a2
-
- # return 0 to indicate child process
- clr d0
- mov d0,(REG_D0,fp)
- jmp syscall_exit
-
-ENTRY(ret_from_kernel_thread)
- call schedule_tail[],0
- mov (REG_D0,fp),d0
- mov (REG_A0,fp),a0
- calls (a0)
- GET_THREAD_INFO a2 # A2 must be set on return from sys_exit()
- clr d0
- mov d0,(REG_D0,fp)
- jmp syscall_exit
-
-###############################################################################
-#
-# system call handler
-#
-###############################################################################
-ENTRY(system_call)
- add -4,sp
- SAVE_ALL
- mov d0,(REG_ORIG_D0,fp)
- GET_THREAD_INFO a2
- cmp nr_syscalls,d0
- bcc syscall_badsys
- btst _TIF_SYSCALL_TRACE,(TI_flags,a2)
- bne syscall_entry_trace
-syscall_call:
- add d0,d0,a1
- add a1,a1
- mov (REG_A0,fp),d0
- mov (sys_call_table,a1),a0
- calls (a0)
- mov d0,(REG_D0,fp)
-syscall_exit:
- # make sure we don't miss an interrupt setting need_resched or
- # sigpending between sampling and the rti
- LOCAL_IRQ_DISABLE
- mov (TI_flags,a2),d2
- btst _TIF_ALLWORK_MASK,d2
- bne syscall_exit_work
-restore_all:
- RESTORE_ALL
-
-###############################################################################
-#
-# perform work that needs to be done immediately before resumption and syscall
-# tracing
-#
-###############################################################################
- ALIGN
-syscall_exit_work:
- mov (REG_EPSW,fp),d0
- and EPSW_nSL,d0
- beq resume_kernel # returning to supervisor mode
-
- LOCAL_IRQ_ENABLE # could let syscall_trace_exit() call
- # schedule() instead
- btst _TIF_SYSCALL_TRACE,d2
- beq work_pending
- mov fp,d0
- call syscall_trace_exit[],0 # do_syscall_trace(regs)
- jmp resume_userspace
-
- ALIGN
-work_pending:
- btst _TIF_NEED_RESCHED,d2
- beq work_notifysig
-
-work_resched:
- call schedule[],0
-
-resume_userspace:
- # make sure we don't miss an interrupt setting need_resched or
- # sigpending between sampling and the rti
- LOCAL_IRQ_DISABLE
-
- # is there any work to be done other than syscall tracing?
- mov (TI_flags,a2),d2
- btst _TIF_WORK_MASK,d2
- beq restore_all
-
- LOCAL_IRQ_ENABLE
- btst _TIF_NEED_RESCHED,d2
- bne work_resched
-
- # deal with pending signals and notify-resume requests
-work_notifysig:
- mov fp,d0
- mov d2,d1
- call do_notify_resume[],0
- jmp resume_userspace
-
- # perform syscall entry tracing
-syscall_entry_trace:
- mov -ENOSYS,d0
- mov d0,(REG_D0,fp)
- mov fp,d0
- call syscall_trace_entry[],0 # returns the syscall number to actually use
- mov (REG_D1,fp),d1
- cmp nr_syscalls,d0
- bcs syscall_call
- jmp syscall_exit
-
-syscall_badsys:
- mov -ENOSYS,d0
- mov d0,(REG_D0,fp)
- jmp resume_userspace
-
- # userspace resumption stub bypassing syscall exit tracing
- .globl ret_from_exception, ret_from_intr
- ALIGN
-ret_from_exception:
- preempt_stop
-ret_from_intr:
- GET_THREAD_INFO a2
- mov (REG_EPSW,fp),d0 # need to deliver signals before
- # returning to userspace
- and EPSW_nSL,d0
- bne resume_userspace # returning to userspace
-
-#ifdef CONFIG_PREEMPT
-resume_kernel:
- LOCAL_IRQ_DISABLE
- mov (TI_preempt_count,a2),d0 # non-zero preempt_count ?
- cmp 0,d0
- bne restore_all
-
-need_resched:
- btst _TIF_NEED_RESCHED,(TI_flags,a2)
- beq restore_all
- mov (REG_EPSW,fp),d0
- and EPSW_IM,d0
- cmp EPSW_IM_7,d0 # interrupts off (exception path) ?
- bne restore_all
- call preempt_schedule_irq[],0
- jmp need_resched
-#else
- jmp resume_kernel
-#endif
-
-
-###############################################################################
-#
-# IRQ handler entry point
-# - intended to be entered at multiple priorities
-#
-###############################################################################
-ENTRY(irq_handler)
- add -4,sp
- SAVE_ALL
-
- # it's not a syscall
- mov 0xffffffff,d0
- mov d0,(REG_ORIG_D0,fp)
-
- mov fp,d0
- call do_IRQ[],0 # do_IRQ(regs)
-
- jmp ret_from_intr
-
-###############################################################################
-#
-# Double Fault handler entry point
-# - note that there will not be a stack, D0/A0 will hold EPSW/PC as were
-#
-###############################################################################
- .section .bss
- .balign THREAD_SIZE
- .space THREAD_SIZE
-__df_stack:
- .previous
-
-ENTRY(double_fault)
- mov a0,(__df_stack-4) # PC as was
- mov d0,(__df_stack-8) # EPSW as was
- mn10300_set_dbfleds # display 'db-f' on the LEDs
- mov 0xaa55aa55,d0
- mov d0,(__df_stack-12) # no ORIG_D0
- mov sp,a0 # save corrupted SP
- mov __df_stack-12,sp # emergency supervisor stack
- SAVE_ALL
- mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got
- # clobbered by the CPU)
- mov fp,d0
- calls do_double_fault
-double_fault_loop:
- bra double_fault_loop
-
-###############################################################################
-#
-# Bus Error handler entry point
-# - handle external (async) bus errors separately
-#
-###############################################################################
-ENTRY(raw_bus_error)
- add -4,sp
- mov d0,(sp)
-#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
- mov (MMUCTR),d0
- mov d0,(MMUCTR)
-#endif
- mov (BCBERR),d0 # what
- btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error
- beq __common_exception_aux # it wasn't
-
- SAVE_ALL
- mov (BCBEAR),d1 # destination of erroneous access
-
- mov (REG_ORIG_D0,fp),d2
- mov d2,(REG_D0,fp)
- mov -1,d2
- mov d2,(REG_ORIG_D0,fp)
-
- add -4,sp
- mov fp,(12,sp) # frame pointer
- call io_bus_error[],0
- jmp restore_all
-
-###############################################################################
-#
-# NMI exception entry points
-#
-# This is used by ordinary interrupt channels that have the GxICR_NMI bit set
-# in addition to the main NMI and Watchdog channels. SMP NMI IPIs use this
-# facility.
-#
-###############################################################################
-ENTRY(nmi_handler)
- add -4,sp
- mov d0,(sp)
- mov (TBR),d0
-
-#ifdef CONFIG_SMP
- add -4,sp
- mov d0,(sp) # save d0(TBR)
- movhu (NMIAGR),d0
- and NMIAGR_GN,d0
- lsr 0x2,d0
- cmp CALL_FUNCTION_NMI_IPI,d0
- bne nmi_not_smp_callfunc # if not call function, jump
-
- # function call nmi ipi
- add 4,sp # no need to store TBR
- mov GxICR_DETECT,d0 # clear NMI request
- movbu d0,(GxICR(CALL_FUNCTION_NMI_IPI))
- movhu (GxICR(CALL_FUNCTION_NMI_IPI)),d0
- and ~EPSW_NMID,epsw # enable NMI
-
- mov (sp),d0 # restore d0
- SAVE_ALL
- call smp_nmi_call_function_interrupt[],0
- RESTORE_ALL
-
-nmi_not_smp_callfunc:
-#ifdef CONFIG_KERNEL_DEBUGGER
- cmp DEBUGGER_NMI_IPI,d0
- bne nmi_not_debugger # if not kernel debugger NMI IPI, jump
-
- # kernel debugger NMI IPI
- add 4,sp # no need to store TBR
- mov GxICR_DETECT,d0 # clear NMI
- movbu d0,(GxICR(DEBUGGER_NMI_IPI))
- movhu (GxICR(DEBUGGER_NMI_IPI)),d0
- and ~EPSW_NMID,epsw # enable NMI
-
- mov (sp),d0
- SAVE_ALL
- mov fp,d0 # arg 0: stacked register file
- mov a2,d1 # arg 1: exception number
- call debugger_nmi_interrupt[],0
- RESTORE_ALL
-
-nmi_not_debugger:
-#endif /* CONFIG_KERNEL_DEBUGGER */
- mov (sp),d0 # restore TBR to d0
- add 4,sp
-#endif /* CONFIG_SMP */
-
- bra __common_exception_nonmi
-
-###############################################################################
-#
-# General exception entry point
-#
-###############################################################################
-ENTRY(__common_exception)
- add -4,sp
- mov d0,(sp)
-#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
- mov (MMUCTR),d0
- mov d0,(MMUCTR)
-#endif
-
-__common_exception_aux:
- mov (TBR),d0
- and ~EPSW_NMID,epsw # turn NMIs back on if not NMI
- or EPSW_IE,epsw
-
-__common_exception_nonmi:
- and 0x0000FFFF,d0 # turn the exception code into a vector
- # table index
-
- btst 0x00000007,d0
- bne 1f
- cmp 0x00000400,d0
- bge 1f
-
- SAVE_ALL # build the stack frame
-
- mov (REG_D0,fp),a2 # get the exception number
- mov (REG_ORIG_D0,fp),d0
- mov d0,(REG_D0,fp)
- mov -1,d0
- mov d0,(REG_ORIG_D0,fp)
-
-#ifdef CONFIG_GDBSTUB
-#ifdef CONFIG_SMP
- call gdbstub_busy_check[],0
- and d0,d0 # check return value
- beq 2f
-#else /* CONFIG_SMP */
- btst 0x01,(gdbstub_busy)
- beq 2f
-#endif /* CONFIG_SMP */
- and ~EPSW_IE,epsw
- mov fp,d0
- mov a2,d1
- call gdbstub_exception[],0 # gdbstub itself caused an exception
- bra restore_all
-2:
-#endif /* CONFIG_GDBSTUB */
-
- mov fp,d0 # arg 0: stacked register file
- mov a2,d1 # arg 1: exception number
- lsr 1,a2
-
- mov (exception_table,a2),a2
- calls (a2)
- jmp ret_from_exception
-
-1: pi # BUG() equivalent
-
-###############################################################################
-#
-# Exception handler functions table
-#
-###############################################################################
- .data
-ENTRY(exception_table)
- .rept 0x400>>1
- .long uninitialised_exception
- .endr
- .previous
-
-###############################################################################
-#
-# Change an entry in the exception table
-# - D0 exception code, D1 handler
-#
-###############################################################################
-ENTRY(set_excp_vector)
- lsr 1,d0
- add exception_table,d0
- mov d1,(d0)
- mov 4,d1
- ret [],0
-
-###############################################################################
-#
-# System call table
-#
-###############################################################################
- .data
-ENTRY(sys_call_table)
- .long sys_restart_syscall /* 0 */
- .long sys_exit
- .long sys_fork
- .long sys_read
- .long sys_write
- .long sys_open /* 5 */
- .long sys_close
- .long sys_waitpid
- .long sys_creat
- .long sys_link
- .long sys_unlink /* 10 */
- .long sys_execve
- .long sys_chdir
- .long sys_time
- .long sys_mknod
- .long sys_chmod /* 15 */
- .long sys_lchown16
- .long sys_ni_syscall /* old break syscall holder */
- .long sys_stat
- .long sys_lseek
- .long sys_getpid /* 20 */
- .long sys_mount
- .long sys_oldumount
- .long sys_setuid16
- .long sys_getuid16
- .long sys_stime /* 25 */
- .long sys_ptrace
- .long sys_alarm
- .long sys_fstat
- .long sys_pause
- .long sys_utime /* 30 */
- .long sys_ni_syscall /* old stty syscall holder */
- .long sys_ni_syscall /* old gtty syscall holder */
- .long sys_access
- .long sys_nice
- .long sys_ni_syscall /* 35 - old ftime syscall holder */
- .long sys_sync
- .long sys_kill
- .long sys_rename
- .long sys_mkdir
- .long sys_rmdir /* 40 */
- .long sys_dup
- .long sys_pipe
- .long sys_times
- .long sys_ni_syscall /* old prof syscall holder */
- .long sys_brk /* 45 */
- .long sys_setgid16
- .long sys_getgid16
- .long sys_signal
- .long sys_geteuid16
- .long sys_getegid16 /* 50 */
- .long sys_acct
- .long sys_umount /* recycled never used phys() */
- .long sys_ni_syscall /* old lock syscall holder */
- .long sys_ioctl
- .long sys_fcntl /* 55 */
- .long sys_ni_syscall /* old mpx syscall holder */
- .long sys_setpgid
- .long sys_ni_syscall /* old ulimit syscall holder */
- .long sys_ni_syscall /* old sys_olduname */
- .long sys_umask /* 60 */
- .long sys_chroot
- .long sys_ustat
- .long sys_dup2
- .long sys_getppid
- .long sys_getpgrp /* 65 */
- .long sys_setsid
- .long sys_sigaction
- .long sys_sgetmask
- .long sys_ssetmask
- .long sys_setreuid16 /* 70 */
- .long sys_setregid16
- .long sys_sigsuspend
- .long sys_sigpending
- .long sys_sethostname
- .long sys_setrlimit /* 75 */
- .long sys_old_getrlimit
- .long sys_getrusage
- .long sys_gettimeofday
- .long sys_settimeofday
- .long sys_getgroups16 /* 80 */
- .long sys_setgroups16
- .long sys_old_select
- .long sys_symlink
- .long sys_lstat
- .long sys_readlink /* 85 */
- .long sys_uselib
- .long sys_swapon
- .long sys_reboot
- .long sys_old_readdir
- .long old_mmap /* 90 */
- .long sys_munmap
- .long sys_truncate
- .long sys_ftruncate
- .long sys_fchmod
- .long sys_fchown16 /* 95 */
- .long sys_getpriority
- .long sys_setpriority
- .long sys_ni_syscall /* old profil syscall holder */
- .long sys_statfs
- .long sys_fstatfs /* 100 */
- .long sys_ni_syscall /* ioperm */
- .long sys_socketcall
- .long sys_syslog
- .long sys_setitimer
- .long sys_getitimer /* 105 */
- .long sys_newstat
- .long sys_newlstat
- .long sys_newfstat
- .long sys_ni_syscall /* old sys_uname */
- .long sys_ni_syscall /* 110 - iopl */
- .long sys_vhangup
- .long sys_ni_syscall /* old "idle" system call */
- .long sys_ni_syscall /* vm86old */
- .long sys_wait4
- .long sys_swapoff /* 115 */
- .long sys_sysinfo
- .long sys_ipc
- .long sys_fsync
- .long sys_sigreturn
- .long sys_clone /* 120 */
- .long sys_setdomainname
- .long sys_newuname
- .long sys_ni_syscall /* modify_ldt */
- .long sys_adjtimex
- .long sys_mprotect /* 125 */
- .long sys_sigprocmask
- .long sys_ni_syscall /* old "create_module" */
- .long sys_init_module
- .long sys_delete_module
- .long sys_ni_syscall /* 130: old "get_kernel_syms" */
- .long sys_quotactl
- .long sys_getpgid
- .long sys_fchdir
- .long sys_bdflush
- .long sys_sysfs /* 135 */
- .long sys_personality
- .long sys_ni_syscall /* reserved for afs_syscall */
- .long sys_setfsuid16
- .long sys_setfsgid16
- .long sys_llseek /* 140 */
- .long sys_getdents
- .long sys_select
- .long sys_flock
- .long sys_msync
- .long sys_readv /* 145 */
- .long sys_writev
- .long sys_getsid
- .long sys_fdatasync
- .long sys_sysctl
- .long sys_mlock /* 150 */
- .long sys_munlock
- .long sys_mlockall
- .long sys_munlockall
- .long sys_sched_setparam
- .long sys_sched_getparam /* 155 */
- .long sys_sched_setscheduler
- .long sys_sched_getscheduler
- .long sys_sched_yield
- .long sys_sched_get_priority_max
- .long sys_sched_get_priority_min /* 160 */
- .long sys_sched_rr_get_interval
- .long sys_nanosleep
- .long sys_mremap
- .long sys_setresuid16
- .long sys_getresuid16 /* 165 */
- .long sys_ni_syscall /* vm86 */
- .long sys_ni_syscall /* Old sys_query_module */
- .long sys_poll
- .long sys_ni_syscall /* was nfsservctl */
- .long sys_setresgid16 /* 170 */
- .long sys_getresgid16
- .long sys_prctl
- .long sys_rt_sigreturn
- .long sys_rt_sigaction
- .long sys_rt_sigprocmask /* 175 */
- .long sys_rt_sigpending
- .long sys_rt_sigtimedwait
- .long sys_rt_sigqueueinfo
- .long sys_rt_sigsuspend
- .long sys_pread64 /* 180 */
- .long sys_pwrite64
- .long sys_chown16
- .long sys_getcwd
- .long sys_capget
- .long sys_capset /* 185 */
- .long sys_sigaltstack
- .long sys_sendfile
- .long sys_ni_syscall /* reserved for streams1 */
- .long sys_ni_syscall /* reserved for streams2 */
- .long sys_vfork /* 190 */
- .long sys_getrlimit
- .long sys_mmap_pgoff
- .long sys_truncate64
- .long sys_ftruncate64
- .long sys_stat64 /* 195 */
- .long sys_lstat64
- .long sys_fstat64
- .long sys_lchown
- .long sys_getuid
- .long sys_getgid /* 200 */
- .long sys_geteuid
- .long sys_getegid
- .long sys_setreuid
- .long sys_setregid
- .long sys_getgroups /* 205 */
- .long sys_setgroups
- .long sys_fchown
- .long sys_setresuid
- .long sys_getresuid
- .long sys_setresgid /* 210 */
- .long sys_getresgid
- .long sys_chown
- .long sys_setuid
- .long sys_setgid
- .long sys_setfsuid /* 215 */
- .long sys_setfsgid
- .long sys_pivot_root
- .long sys_mincore
- .long sys_madvise
- .long sys_getdents64 /* 220 */
- .long sys_fcntl64
- .long sys_ni_syscall /* reserved for TUX */
- .long sys_ni_syscall
- .long sys_gettid
- .long sys_readahead /* 225 */
- .long sys_setxattr
- .long sys_lsetxattr
- .long sys_fsetxattr
- .long sys_getxattr
- .long sys_lgetxattr /* 230 */
- .long sys_fgetxattr
- .long sys_listxattr
- .long sys_llistxattr
- .long sys_flistxattr
- .long sys_removexattr /* 235 */
- .long sys_lremovexattr
- .long sys_fremovexattr
- .long sys_tkill
- .long sys_sendfile64
- .long sys_futex /* 240 */
- .long sys_sched_setaffinity
- .long sys_sched_getaffinity
- .long sys_ni_syscall /* sys_set_thread_area */
- .long sys_ni_syscall /* sys_get_thread_area */
- .long sys_io_setup /* 245 */
- .long sys_io_destroy
- .long sys_io_getevents
- .long sys_io_submit
- .long sys_io_cancel
- .long sys_fadvise64 /* 250 */
- .long sys_ni_syscall
- .long sys_exit_group
- .long sys_lookup_dcookie
- .long sys_epoll_create
- .long sys_epoll_ctl /* 255 */
- .long sys_epoll_wait
- .long sys_remap_file_pages
- .long sys_set_tid_address
- .long sys_timer_create
- .long sys_timer_settime /* 260 */
- .long sys_timer_gettime
- .long sys_timer_getoverrun
- .long sys_timer_delete
- .long sys_clock_settime
- .long sys_clock_gettime /* 265 */
- .long sys_clock_getres
- .long sys_clock_nanosleep
- .long sys_statfs64
- .long sys_fstatfs64
- .long sys_tgkill /* 270 */
- .long sys_utimes
- .long sys_fadvise64_64
- .long sys_ni_syscall /* sys_vserver */
- .long sys_mbind
- .long sys_get_mempolicy /* 275 */
- .long sys_set_mempolicy
- .long sys_mq_open
- .long sys_mq_unlink
- .long sys_mq_timedsend
- .long sys_mq_timedreceive /* 280 */
- .long sys_mq_notify
- .long sys_mq_getsetattr
- .long sys_kexec_load
- .long sys_waitid
- .long sys_ni_syscall /* 285 */ /* available */
- .long sys_add_key
- .long sys_request_key
- .long sys_keyctl
- .long sys_cacheflush
- .long sys_ioprio_set /* 290 */
- .long sys_ioprio_get
- .long sys_inotify_init
- .long sys_inotify_add_watch
- .long sys_inotify_rm_watch
- .long sys_migrate_pages /* 295 */
- .long sys_openat
- .long sys_mkdirat
- .long sys_mknodat
- .long sys_fchownat
- .long sys_futimesat /* 300 */
- .long sys_fstatat64
- .long sys_unlinkat
- .long sys_renameat
- .long sys_linkat
- .long sys_symlinkat /* 305 */
- .long sys_readlinkat
- .long sys_fchmodat
- .long sys_faccessat
- .long sys_pselect6
- .long sys_ppoll /* 310 */
- .long sys_unshare
- .long sys_set_robust_list
- .long sys_get_robust_list
- .long sys_splice
- .long sys_sync_file_range /* 315 */
- .long sys_tee
- .long sys_vmsplice
- .long sys_move_pages
- .long sys_getcpu
- .long sys_epoll_pwait /* 320 */
- .long sys_utimensat
- .long sys_signalfd
- .long sys_timerfd_create
- .long sys_eventfd
- .long sys_fallocate /* 325 */
- .long sys_timerfd_settime
- .long sys_timerfd_gettime
- .long sys_signalfd4
- .long sys_eventfd2
- .long sys_epoll_create1 /* 330 */
- .long sys_dup3
- .long sys_pipe2
- .long sys_inotify_init1
- .long sys_preadv
- .long sys_pwritev /* 335 */
- .long sys_rt_tgsigqueueinfo
- .long sys_perf_event_open
- .long sys_recvmmsg
- .long sys_setns
-
-
-nr_syscalls=(.-sys_call_table)/4