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7b21fddd08
linux/arch/mn10300/kernel/entry.S
Eric W. Biederman 7b21fddd08 ns: Wire up the setns system call 
32bit and 64bit on x86 are tested and working.  The rest I have looked
at closely and I can't find any problems.

setns is an easy system call to wire up.  It just takes two ints so I
don't expect any weird architecture porting problems.

While doing this I have noticed that we have some architectures that are
very slow to get new system calls.  cris seems to be the slowest where
the last system calls wired up were preadv and pwritev.  avr32 is weird
in that recvmmsg was wired up but never declared in unistd.h.  frv is
behind with perf_event_open being the last syscall wired up.  On h8300
the last system call wired up was epoll_wait.  On m32r the last system
call wired up was fallocate.  mn10300 has recvmmsg as the last system
call wired up.  The rest seem to at least have syncfs wired up which was
new in the 2.6.39.

v2: Most of the architecture support added by Daniel Lezcano <dlezcano@fr.ibm.com>
v3: ported to v2.6.36-rc4 by: Eric W. Biederman <ebiederm@xmission.com>
v4: Moved wiring up of the system call to another patch
v5: ported to v2.6.39-rc6
v6: rebased onto parisc-next and net-next to avoid syscall  conflicts.
v7: ported to Linus's latest post 2.6.39 tree.

>  arch/blackfin/include/asm/unistd.h     |    3 ++-
>  arch/blackfin/mach-common/entry.S      |    1 +
Acked-by: Mike Frysinger <vapier@gentoo.org>

Oh - ia64 wiring looks good.
Acked-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-28 10:48:39 -07:00

766 lines
19 KiB
ArmAsm
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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/system.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
###############################################################################
#
# 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:
btst _TIF_SYSCALL_TRACE,d2
beq work_pending
LOCAL_IRQ_ENABLE # could let syscall_trace_exit() call
# schedule() instead
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
# 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
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
beq resume_kernel # returning to supervisor mode
ENTRY(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 on int/exception return?
mov (TI_flags,a2),d2
btst _TIF_WORK_MASK,d2
bne work_pending
jmp restore_all
#ifdef CONFIG_PREEMPT
ENTRY(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
#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_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
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