arch/mn10300/kernel/entry.S

   1 ###############################################################################
   2 #
   3 # MN10300 Exception and interrupt entry points
   4 #
   5 # Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
   6 # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   7 # Modified by David Howells (dhowells@redhat.com)
   8 #
   9 # This program is free software; you can redistribute it and/or
  10 # modify it under the terms of the GNU General Public Licence
  11 # as published by the Free Software Foundation; either version
  12 # 2 of the Licence, or (at your option) any later version.
  13 #
  14 ###############################################################################
  15 #include <linux/sys.h>
  16 #include <linux/linkage.h>
  17 #include <asm/smp.h>
  18 #include <asm/system.h>
  19 #include <asm/thread_info.h>
  20 #include <asm/intctl-regs.h>
  21 #include <asm/busctl-regs.h>
  22 #include <asm/timer-regs.h>
  23 #include <unit/leds.h>
  24 #include <asm/page.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/errno.h>
  27 #include <asm/asm-offsets.h>
  28 #include <asm/frame.inc>
  29
  30 #ifdef CONFIG_PREEMPT
  31 #define preempt_stop            __cli
  32 #else
  33 #define preempt_stop
  34 #define resume_kernel           restore_all
  35 #endif
  36
  37         .macro __cli
  38         and     ~EPSW_IM,epsw
  39         or      EPSW_IE|MN10300_CLI_LEVEL,epsw
  40         nop
  41         nop
  42         nop
  43         .endm
  44         .macro __sti
  45         or      EPSW_IE|EPSW_IM_7,epsw
  46         .endm
  47
  48
  49         .am33_2
  50
  51 ###############################################################################
  52 #
  53 # the return path for a forked child
  54 # - on entry, D0 holds the address of the previous task to run
  55 #
  56 ###############################################################################
  57 ENTRY(ret_from_fork)
  58         call    schedule_tail[],0
  59         GET_THREAD_INFO a2
  60
  61         # return 0 to indicate child process
  62         clr     d0
  63         mov     d0,(REG_D0,fp)
  64         jmp     syscall_exit
  65
  66 ###############################################################################
  67 #
  68 # system call handler
  69 #
  70 ###############################################################################
  71 ENTRY(system_call)
  72         add     -4,sp
  73         SAVE_ALL
  74         mov     d0,(REG_ORIG_D0,fp)
  75         GET_THREAD_INFO a2
  76         cmp     nr_syscalls,d0
  77         bcc     syscall_badsys
  78         btst    _TIF_SYSCALL_TRACE,(TI_flags,a2)
  79         bne     syscall_entry_trace
  80 syscall_call:
  81         add     d0,d0,a1
  82         add     a1,a1
  83         mov     (REG_A0,fp),d0
  84         mov     (sys_call_table,a1),a0
  85         calls   (a0)
  86         mov     d0,(REG_D0,fp)
  87 syscall_exit:
  88         # make sure we don't miss an interrupt setting need_resched or
  89         # sigpending between sampling and the rti
  90         __cli
  91         mov     (TI_flags,a2),d2
  92         btst    _TIF_ALLWORK_MASK,d2
  93         bne     syscall_exit_work
  94 restore_all:
  95         RESTORE_ALL
  96
  97 ###############################################################################
  98 #
  99 # perform work that needs to be done immediately before resumption and syscall
 100 # tracing
 101 #
 102 ###############################################################################
 103         ALIGN
 104 syscall_exit_work:
 105         btst    _TIF_SYSCALL_TRACE,d2
 106         beq     work_pending
 107         __sti                           # could let syscall_trace_exit() call
 108                                         # schedule() instead
 109         mov     fp,d0
 110         call    syscall_trace_exit[],0  # do_syscall_trace(regs)
 111         jmp     resume_userspace
 112
 113         ALIGN
 114 work_pending:
 115         btst    _TIF_NEED_RESCHED,d2
 116         beq     work_notifysig
 117
 118 work_resched:
 119         call    schedule[],0
 120
 121         # make sure we don't miss an interrupt setting need_resched or
 122         # sigpending between sampling and the rti
 123         __cli
 124
 125         # is there any work to be done other than syscall tracing?
 126         mov     (TI_flags,a2),d2
 127         btst    _TIF_WORK_MASK,d2
 128         beq     restore_all
 129         btst    _TIF_NEED_RESCHED,d2
 130         bne     work_resched
 131
 132         # deal with pending signals and notify-resume requests
 133 work_notifysig:
 134         mov     fp,d0
 135         mov     d2,d1
 136         call    do_notify_resume[],0
 137         jmp     resume_userspace
 138
 139         # perform syscall entry tracing
 140 syscall_entry_trace:
 141         mov     -ENOSYS,d0
 142         mov     d0,(REG_D0,fp)
 143         mov     fp,d0
 144         call    syscall_trace_entry[],0 # returns the syscall number to actually use
 145         mov     (REG_D1,fp),d1
 146         cmp     nr_syscalls,d0
 147         bcs     syscall_call
 148         jmp     syscall_exit
 149
 150 syscall_badsys:
 151         mov     -ENOSYS,d0
 152         mov     d0,(REG_D0,fp)
 153         jmp     resume_userspace
 154
 155         # userspace resumption stub bypassing syscall exit tracing
 156         .globl  ret_from_exception, ret_from_intr
 157         ALIGN
 158 ret_from_exception:
 159         preempt_stop
 160 ret_from_intr:
 161         GET_THREAD_INFO a2
 162         mov     (REG_EPSW,fp),d0        # need to deliver signals before
 163                                         # returning to userspace
 164         and     EPSW_nSL,d0
 165         beq     resume_kernel           # returning to supervisor mode
 166
 167 ENTRY(resume_userspace)
 168         # make sure we don't miss an interrupt setting need_resched or
 169         # sigpending between sampling and the rti
 170         __cli
 171
 172         # is there any work to be done on int/exception return?
 173         mov     (TI_flags,a2),d2
 174         btst    _TIF_WORK_MASK,d2
 175         bne     work_pending
 176         jmp     restore_all
 177
 178 #ifdef CONFIG_PREEMPT
 179 ENTRY(resume_kernel)
 180         __cli
 181         mov     (TI_preempt_count,a2),d0        # non-zero preempt_count ?
 182         cmp     0,d0
 183         bne     restore_all
 184
 185 need_resched:
 186         btst    _TIF_NEED_RESCHED,(TI_flags,a2)
 187         beq     restore_all
 188         mov     (REG_EPSW,fp),d0
 189         and     EPSW_IM,d0
 190         cmp     EPSW_IM_7,d0            # interrupts off (exception path) ?
 191         bne     restore_all
 192         call    preempt_schedule_irq[],0
 193         jmp     need_resched
 194 #endif
 195
 196
 197 ###############################################################################
 198 #
 199 # IRQ handler entry point
 200 # - intended to be entered at multiple priorities
 201 #
 202 ###############################################################################
 203 ENTRY(irq_handler)
 204         add     -4,sp
 205         SAVE_ALL
 206
 207         # it's not a syscall
 208         mov     0xffffffff,d0
 209         mov     d0,(REG_ORIG_D0,fp)
 210
 211         mov     fp,d0
 212         call    do_IRQ[],0                      # do_IRQ(regs)
 213
 214         jmp     ret_from_intr
 215
 216 ###############################################################################
 217 #
 218 # Monitor Signal handler entry point
 219 #
 220 ###############################################################################
 221 ENTRY(monitor_signal)
 222         movbu   (0xae000001),d1
 223         cmp     1,d1
 224         beq     monsignal
 225         ret     [],0
 226
 227 monsignal:
 228         or      EPSW_NMID,epsw
 229         mov     d0,a0
 230         mov     a0,sp
 231         mov     (REG_EPSW,fp),d1
 232         and     ~EPSW_nSL,d1
 233         mov     d1,(REG_EPSW,fp)
 234         movm    (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
 235         mov     (sp),a1
 236         mov     a1,usp
 237         movm    (sp),[other]
 238         add     4,sp
 239 here:   jmp     0x8e000008-here+0x8e000008
 240
 241 ###############################################################################
 242 #
 243 # Double Fault handler entry point
 244 # - note that there will not be a stack, D0/A0 will hold EPSW/PC as were
 245 #
 246 ###############################################################################
 247         .section .bss
 248         .balign THREAD_SIZE
 249         .space  THREAD_SIZE
 250 __df_stack:
 251         .previous
 252
 253 ENTRY(double_fault)
 254         mov     a0,(__df_stack-4)       # PC as was
 255         mov     d0,(__df_stack-8)       # EPSW as was
 256         mn10300_set_dbfleds             # display 'db-f' on the LEDs
 257         mov     0xaa55aa55,d0
 258         mov     d0,(__df_stack-12)      # no ORIG_D0
 259         mov     sp,a0                   # save corrupted SP
 260         mov     __df_stack-12,sp        # emergency supervisor stack
 261         SAVE_ALL
 262         mov     a0,(REG_A0,fp)          # save corrupted SP as A0 (which got
 263                                         # clobbered by the CPU)
 264         mov     fp,d0
 265         calls   do_double_fault
 266 double_fault_loop:
 267         bra     double_fault_loop
 268
 269 ###############################################################################
 270 #
 271 # Bus Error handler entry point
 272 # - handle external (async) bus errors separately
 273 #
 274 ###############################################################################
 275 ENTRY(raw_bus_error)
 276         add     -4,sp
 277         mov     d0,(sp)
 278         mov     (BCBERR),d0             # what
 279         btst    BCBERR_BEMR_DMA,d0      # see if it was an external bus error
 280         beq     __common_exception_aux  # it wasn't
 281
 282         SAVE_ALL
 283         mov     (BCBEAR),d1             # destination of erroneous access
 284
 285         mov     (REG_ORIG_D0,fp),d2
 286         mov     d2,(REG_D0,fp)
 287         mov     -1,d2
 288         mov     d2,(REG_ORIG_D0,fp)
 289
 290         add     -4,sp
 291         mov     fp,(12,sp)              # frame pointer
 292         call    io_bus_error[],0
 293         jmp     restore_all
 294
 295 ###############################################################################
 296 #
 297 # Miscellaneous exception entry points
 298 #
 299 ###############################################################################
 300 ENTRY(nmi_handler)
 301         add     -4,sp
 302         mov     d0,(sp)
 303         mov     (TBR),d0
 304         bra     __common_exception_nonmi
 305
 306 ENTRY(__common_exception)
 307         add     -4,sp
 308         mov     d0,(sp)
 309
 310 __common_exception_aux:
 311         mov     (TBR),d0
 312         and     ~EPSW_NMID,epsw         # turn NMIs back on if not NMI
 313         or      EPSW_IE,epsw
 314
 315 __common_exception_nonmi:
 316         and     0x0000FFFF,d0           # turn the exception code into a vector
 317                                         # table index
 318
 319         btst    0x00000007,d0
 320         bne     1f
 321         cmp     0x00000400,d0
 322         bge     1f
 323
 324         SAVE_ALL                        # build the stack frame
 325
 326         mov     (REG_D0,fp),a2          # get the exception number
 327         mov     (REG_ORIG_D0,fp),d0
 328         mov     d0,(REG_D0,fp)
 329         mov     -1,d0
 330         mov     d0,(REG_ORIG_D0,fp)
 331
 332 #ifdef CONFIG_GDBSTUB
 333         btst    0x01,(gdbstub_busy)
 334         beq     2f
 335         and     ~EPSW_IE,epsw
 336         mov     fp,d0
 337         mov     a2,d1
 338         call    gdbstub_exception[],0   # gdbstub itself caused an exception
 339         bra     restore_all
 340 2:
 341 #endif
 342
 343         mov     fp,d0                   # arg 0: stacked register file
 344         mov     a2,d1                   # arg 1: exception number
 345         lsr     1,a2
 346
 347         mov     (exception_table,a2),a2
 348         calls   (a2)
 349         jmp     ret_from_exception
 350
 351 1:      pi                              # BUG() equivalent
 352
 353 ###############################################################################
 354 #
 355 # Exception handler functions table
 356 #
 357 ###############################################################################
 358         .data
 359 ENTRY(exception_table)
 360         .rept   0x400>>1
 361          .long  uninitialised_exception
 362         .endr
 363         .previous
 364
 365 ###############################################################################
 366 #
 367 # Change an entry in the exception table
 368 # - D0 exception code, D1 handler
 369 #
 370 ###############################################################################
 371 ENTRY(set_excp_vector)
 372         lsr     1,d0
 373         add     exception_table,d0
 374         mov     d1,(d0)
 375         mov     4,d1
 376 #if defined(CONFIG_MN10300_CACHE_WBACK)
 377         jmp     mn10300_dcache_flush_inv_range2
 378 #else
 379         ret     [],0
 380 #endif
 381
 382 ###############################################################################
 383 #
 384 # System call table
 385 #
 386 ###############################################################################
 387         .data
 388 ENTRY(sys_call_table)
 389         .long sys_restart_syscall       /* 0 */
 390         .long sys_exit
 391         .long sys_fork
 392         .long sys_read
 393         .long sys_write
 394         .long sys_open          /* 5 */
 395         .long sys_close
 396         .long sys_waitpid
 397         .long sys_creat
 398         .long sys_link
 399         .long sys_unlink        /* 10 */
 400         .long sys_execve
 401         .long sys_chdir
 402         .long sys_time
 403         .long sys_mknod
 404         .long sys_chmod         /* 15 */
 405         .long sys_lchown16
 406         .long sys_ni_syscall    /* old break syscall holder */
 407         .long sys_stat
 408         .long sys_lseek
 409         .long sys_getpid        /* 20 */
 410         .long sys_mount
 411         .long sys_oldumount
 412         .long sys_setuid16
 413         .long sys_getuid16
 414         .long sys_stime         /* 25 */
 415         .long sys_ptrace
 416         .long sys_alarm
 417         .long sys_fstat
 418         .long sys_pause
 419         .long sys_utime         /* 30 */
 420         .long sys_ni_syscall    /* old stty syscall holder */
 421         .long sys_ni_syscall    /* old gtty syscall holder */
 422         .long sys_access
 423         .long sys_nice
 424         .long sys_ni_syscall    /* 35 - old ftime syscall holder */
 425         .long sys_sync
 426         .long sys_kill
 427         .long sys_rename
 428         .long sys_mkdir
 429         .long sys_rmdir         /* 40 */
 430         .long sys_dup
 431         .long sys_pipe
 432         .long sys_times
 433         .long sys_ni_syscall    /* old prof syscall holder */
 434         .long sys_brk           /* 45 */
 435         .long sys_setgid16
 436         .long sys_getgid16
 437         .long sys_signal
 438         .long sys_geteuid16
 439         .long sys_getegid16     /* 50 */
 440         .long sys_acct
 441         .long sys_umount        /* recycled never used phys() */
 442         .long sys_ni_syscall    /* old lock syscall holder */
 443         .long sys_ioctl
 444         .long sys_fcntl         /* 55 */
 445         .long sys_ni_syscall    /* old mpx syscall holder */
 446         .long sys_setpgid
 447         .long sys_ni_syscall    /* old ulimit syscall holder */
 448         .long sys_ni_syscall    /* old sys_olduname */
 449         .long sys_umask         /* 60 */
 450         .long sys_chroot
 451         .long sys_ustat
 452         .long sys_dup2
 453         .long sys_getppid
 454         .long sys_getpgrp       /* 65 */
 455         .long sys_setsid
 456         .long sys_sigaction
 457         .long sys_sgetmask
 458         .long sys_ssetmask
 459         .long sys_setreuid16    /* 70 */
 460         .long sys_setregid16
 461         .long sys_sigsuspend
 462         .long sys_sigpending
 463         .long sys_sethostname
 464         .long sys_setrlimit     /* 75 */
 465         .long sys_old_getrlimit
 466         .long sys_getrusage
 467         .long sys_gettimeofday
 468         .long sys_settimeofday
 469         .long sys_getgroups16   /* 80 */
 470         .long sys_setgroups16
 471         .long old_select
 472         .long sys_symlink
 473         .long sys_lstat
 474         .long sys_readlink      /* 85 */
 475         .long sys_uselib
 476         .long sys_swapon
 477         .long sys_reboot
 478         .long sys_old_readdir
 479         .long old_mmap          /* 90 */
 480         .long sys_munmap
 481         .long sys_truncate
 482         .long sys_ftruncate
 483         .long sys_fchmod
 484         .long sys_fchown16      /* 95 */
 485         .long sys_getpriority
 486         .long sys_setpriority
 487         .long sys_ni_syscall    /* old profil syscall holder */
 488         .long sys_statfs
 489         .long sys_fstatfs       /* 100 */
 490         .long sys_ni_syscall    /* ioperm */
 491         .long sys_socketcall
 492         .long sys_syslog
 493         .long sys_setitimer
 494         .long sys_getitimer     /* 105 */
 495         .long sys_newstat
 496         .long sys_newlstat
 497         .long sys_newfstat
 498         .long sys_ni_syscall    /* old sys_uname */
 499         .long sys_ni_syscall    /* 110 - iopl */
 500         .long sys_vhangup
 501         .long sys_ni_syscall    /* old "idle" system call */
 502         .long sys_ni_syscall    /* vm86old */
 503         .long sys_wait4
 504         .long sys_swapoff       /* 115 */
 505         .long sys_sysinfo
 506         .long sys_ipc
 507         .long sys_fsync
 508         .long sys_sigreturn
 509         .long sys_clone         /* 120 */
 510         .long sys_setdomainname
 511         .long sys_newuname
 512         .long sys_ni_syscall    /* modify_ldt */
 513         .long sys_adjtimex
 514         .long sys_mprotect      /* 125 */
 515         .long sys_sigprocmask
 516         .long sys_ni_syscall    /* old "create_module" */
 517         .long sys_init_module
 518         .long sys_delete_module
 519         .long sys_ni_syscall    /* 130: old "get_kernel_syms" */
 520         .long sys_quotactl
 521         .long sys_getpgid
 522         .long sys_fchdir
 523         .long sys_bdflush
 524         .long sys_sysfs         /* 135 */
 525         .long sys_personality
 526         .long sys_ni_syscall    /* reserved for afs_syscall */
 527         .long sys_setfsuid16
 528         .long sys_setfsgid16
 529         .long sys_llseek        /* 140 */
 530         .long sys_getdents
 531         .long sys_select
 532         .long sys_flock
 533         .long sys_msync
 534         .long sys_readv         /* 145 */
 535         .long sys_writev
 536         .long sys_getsid
 537         .long sys_fdatasync
 538         .long sys_sysctl
 539         .long sys_mlock         /* 150 */
 540         .long sys_munlock
 541         .long sys_mlockall
 542         .long sys_munlockall
 543         .long sys_sched_setparam
 544         .long sys_sched_getparam   /* 155 */
 545         .long sys_sched_setscheduler
 546         .long sys_sched_getscheduler
 547         .long sys_sched_yield
 548         .long sys_sched_get_priority_max
 549         .long sys_sched_get_priority_min  /* 160 */
 550         .long sys_sched_rr_get_interval
 551         .long sys_nanosleep
 552         .long sys_mremap
 553         .long sys_setresuid16
 554         .long sys_getresuid16   /* 165 */
 555         .long sys_ni_syscall    /* vm86 */
 556         .long sys_ni_syscall    /* Old sys_query_module */
 557         .long sys_poll
 558         .long sys_nfsservctl
 559         .long sys_setresgid16   /* 170 */
 560         .long sys_getresgid16
 561         .long sys_prctl
 562         .long sys_rt_sigreturn
 563         .long sys_rt_sigaction
 564         .long sys_rt_sigprocmask        /* 175 */
 565         .long sys_rt_sigpending
 566         .long sys_rt_sigtimedwait
 567         .long sys_rt_sigqueueinfo
 568         .long sys_rt_sigsuspend
 569         .long sys_pread64       /* 180 */
 570         .long sys_pwrite64
 571         .long sys_chown16
 572         .long sys_getcwd
 573         .long sys_capget
 574         .long sys_capset        /* 185 */
 575         .long sys_sigaltstack
 576         .long sys_sendfile
 577         .long sys_ni_syscall    /* reserved for streams1 */
 578         .long sys_ni_syscall    /* reserved for streams2 */
 579         .long sys_vfork         /* 190 */
 580         .long sys_getrlimit
 581         .long sys_mmap2
 582         .long sys_truncate64
 583         .long sys_ftruncate64
 584         .long sys_stat64        /* 195 */
 585         .long sys_lstat64
 586         .long sys_fstat64
 587         .long sys_lchown
 588         .long sys_getuid
 589         .long sys_getgid        /* 200 */
 590         .long sys_geteuid
 591         .long sys_getegid
 592         .long sys_setreuid
 593         .long sys_setregid
 594         .long sys_getgroups     /* 205 */
 595         .long sys_setgroups
 596         .long sys_fchown
 597         .long sys_setresuid
 598         .long sys_getresuid
 599         .long sys_setresgid     /* 210 */
 600         .long sys_getresgid
 601         .long sys_chown
 602         .long sys_setuid
 603         .long sys_setgid
 604         .long sys_setfsuid      /* 215 */
 605         .long sys_setfsgid
 606         .long sys_pivot_root
 607         .long sys_mincore
 608         .long sys_madvise
 609         .long sys_getdents64    /* 220 */
 610         .long sys_fcntl64
 611         .long sys_ni_syscall    /* reserved for TUX */
 612         .long sys_ni_syscall
 613         .long sys_gettid
 614         .long sys_readahead     /* 225 */
 615         .long sys_setxattr
 616         .long sys_lsetxattr
 617         .long sys_fsetxattr
 618         .long sys_getxattr
 619         .long sys_lgetxattr     /* 230 */
 620         .long sys_fgetxattr
 621         .long sys_listxattr
 622         .long sys_llistxattr
 623         .long sys_flistxattr
 624         .long sys_removexattr   /* 235 */
 625         .long sys_lremovexattr
 626         .long sys_fremovexattr
 627         .long sys_tkill
 628         .long sys_sendfile64
 629         .long sys_futex         /* 240 */
 630         .long sys_sched_setaffinity
 631         .long sys_sched_getaffinity
 632         .long sys_ni_syscall    /* sys_set_thread_area */
 633         .long sys_ni_syscall    /* sys_get_thread_area */
 634         .long sys_io_setup      /* 245 */
 635         .long sys_io_destroy
 636         .long sys_io_getevents
 637         .long sys_io_submit
 638         .long sys_io_cancel
 639         .long sys_fadvise64     /* 250 */
 640         .long sys_ni_syscall
 641         .long sys_exit_group
 642         .long sys_lookup_dcookie
 643         .long sys_epoll_create
 644         .long sys_epoll_ctl     /* 255 */
 645         .long sys_epoll_wait
 646         .long sys_remap_file_pages
 647         .long sys_set_tid_address
 648         .long sys_timer_create
 649         .long sys_timer_settime         /* 260 */
 650         .long sys_timer_gettime
 651         .long sys_timer_getoverrun
 652         .long sys_timer_delete
 653         .long sys_clock_settime
 654         .long sys_clock_gettime         /* 265 */
 655         .long sys_clock_getres
 656         .long sys_clock_nanosleep
 657         .long sys_statfs64
 658         .long sys_fstatfs64
 659         .long sys_tgkill                /* 270 */
 660         .long sys_utimes
 661         .long sys_fadvise64_64
 662         .long sys_ni_syscall    /* sys_vserver */
 663         .long sys_mbind
 664         .long sys_get_mempolicy         /* 275 */
 665         .long sys_set_mempolicy
 666         .long sys_mq_open
 667         .long sys_mq_unlink
 668         .long sys_mq_timedsend
 669         .long sys_mq_timedreceive       /* 280 */
 670         .long sys_mq_notify
 671         .long sys_mq_getsetattr
 672         .long sys_kexec_load
 673         .long sys_waitid
 674         .long sys_ni_syscall            /* 285 */ /* available */
 675         .long sys_add_key
 676         .long sys_request_key
 677         .long sys_keyctl
 678         .long sys_cacheflush
 679         .long sys_ioprio_set            /* 290 */
 680         .long sys_ioprio_get
 681         .long sys_inotify_init
 682         .long sys_inotify_add_watch
 683         .long sys_inotify_rm_watch
 684         .long sys_migrate_pages         /* 295 */
 685         .long sys_openat
 686         .long sys_mkdirat
 687         .long sys_mknodat
 688         .long sys_fchownat
 689         .long sys_futimesat             /* 300 */
 690         .long sys_fstatat64
 691         .long sys_unlinkat
 692         .long sys_renameat
 693         .long sys_linkat
 694         .long sys_symlinkat             /* 305 */
 695         .long sys_readlinkat
 696         .long sys_fchmodat
 697         .long sys_faccessat
 698         .long sys_pselect6
 699         .long sys_ppoll                 /* 310 */
 700         .long sys_unshare
 701         .long sys_set_robust_list
 702         .long sys_get_robust_list
 703         .long sys_splice
 704         .long sys_sync_file_range       /* 315 */
 705         .long sys_tee
 706         .long sys_vmsplice
 707         .long sys_move_pages
 708         .long sys_getcpu
 709         .long sys_epoll_pwait           /* 320 */
 710         .long sys_utimensat
 711         .long sys_signalfd
 712         .long sys_timerfd_create
 713         .long sys_eventfd
 714         .long sys_fallocate             /* 325 */
 715         .long sys_timerfd_settime
 716         .long sys_timerfd_gettime
 717         .long sys_signalfd4
 718         .long sys_eventfd2
 719         .long sys_epoll_create1         /* 330 */
 720         .long sys_dup3
 721         .long sys_pipe2
 722         .long sys_inotify_init1
 723         .long sys_preadv
 724         .long sys_pwritev               /* 335 */
 725         .long sys_rt_tgsigqueueinfo
 726         .long sys_perf_event_open
 727
 728
 729 nr_syscalls=(.-sys_call_table)/4