Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* -*- 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.
 *
 *  6/05/00 RZ:  addedd writeback completion after return from sighandler
 *               for 68040
 */

#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 <asm/unistd.h>

#include <asm/asm-offsets.h>

.globl system_call, buserr, trap, resume
.globl sys_call_table
.globl sys_fork, sys_clone, sys_vfork
.globl ret_from_interrupt, bad_interrupt
.globl auto_irqhandler_fixup
.globl user_irqvec_fixup, user_irqhandler_fixup

.text
ENTRY(buserr)
        SAVE_ALL_INT
        GET_CURRENT(%d0)
        movel   %sp,%sp@-               | stack frame pointer argument
        bsrl    buserr_c
        addql   #4,%sp
        jra     .Lret_from_exception

ENTRY(trap)
        SAVE_ALL_INT
        GET_CURRENT(%d0)
        movel   %sp,%sp@-               | stack frame pointer argument
        bsrl    trap_c
        addql   #4,%sp
        jra     .Lret_from_exception

        | After a fork we jump here directly from resume,
        | so that %d1 contains the previous task
        | schedule_tail now used regardless of CONFIG_SMP
ENTRY(ret_from_fork)
        movel   %d1,%sp@-
        jsr     schedule_tail
        addql   #4,%sp
        jra     .Lret_from_exception

do_trace_entry:
        movel   #-ENOSYS,%sp@(PT_D0)    | needed for strace
        subql   #4,%sp
        SAVE_SWITCH_STACK
        jbsr    syscall_trace
        RESTORE_SWITCH_STACK
        addql   #4,%sp
        movel   %sp@(PT_ORIG_D0),%d0
        cmpl    #NR_syscalls,%d0
        jcs     syscall
badsys:
        movel   #-ENOSYS,%sp@(PT_D0)
        jra     ret_from_syscall

do_trace_exit:
        subql   #4,%sp
        SAVE_SWITCH_STACK
        jbsr    syscall_trace
        RESTORE_SWITCH_STACK
        addql   #4,%sp
        jra     .Lret_from_exception

ENTRY(ret_from_signal)
        RESTORE_SWITCH_STACK
        addql   #4,%sp
/* on 68040 complete pending writebacks if any */
#ifdef CONFIG_M68040
        bfextu  %sp@(PT_VECTOR){#0,#4},%d0
        subql   #7,%d0                          | bus error frame ?
        jbne    1f
        movel   %sp,%sp@-
        jbsr    berr_040cleanup
        addql   #4,%sp
1:
#endif
        jra     .Lret_from_exception

ENTRY(system_call)
        SAVE_ALL_SYS

        GET_CURRENT(%d1)
        | save top of frame
        movel   %sp,%curptr@(TASK_THREAD+THREAD_ESP0)

        | syscall trace?
        tstb    %curptr@(TASK_INFO+TINFO_FLAGS+2)
        jmi     do_trace_entry
        cmpl    #NR_syscalls,%d0
        jcc     badsys
syscall:
        jbsr    @(sys_call_table,%d0:l:4)@(0)
        movel   %d0,%sp@(PT_D0)         | save the return value
ret_from_syscall:
        |oriw   #0x0700,%sr
        movew   %curptr@(TASK_INFO+TINFO_FLAGS+2),%d0
        jne     syscall_exit_work
1:      RESTORE_ALL

syscall_exit_work:
        btst    #5,%sp@(PT_SR)          | check if returning to kernel
        bnes    1b                      | if so, skip resched, signals
        lslw    #1,%d0
        jcs     do_trace_exit
        jmi     do_delayed_trace
        lslw    #8,%d0
        jmi     do_signal_return
        pea     resume_userspace
        jra     schedule


ENTRY(ret_from_exception)
.Lret_from_exception:
        btst    #5,%sp@(PT_SR)          | check if returning to kernel
        bnes    1f                      | 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 interrupt load
        andw    #ALLOWINT,%sr

resume_userspace:
        moveb   %curptr@(TASK_INFO+TINFO_FLAGS+3),%d0
        jne     exit_work
1:      RESTORE_ALL

exit_work:
        | save top of frame
        movel   %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
        lslb    #1,%d0
        jmi     do_signal_return
        pea     resume_userspace
        jra     schedule


do_signal_return:
        |andw   #ALLOWINT,%sr
        subql   #4,%sp                  | dummy return address
        SAVE_SWITCH_STACK
        pea     %sp@(SWITCH_STACK_SIZE)
        clrl    %sp@-
        bsrl    do_signal
        addql   #8,%sp
        RESTORE_SWITCH_STACK
        addql   #4,%sp
        jbra    resume_userspace

do_delayed_trace:
        bclr    #7,%sp@(PT_SR)          | clear trace bit in SR
        pea     1                       | send SIGTRAP
        movel   %curptr,%sp@-
        pea     LSIGTRAP
        jbsr    send_sig
        addql   #8,%sp
        addql   #4,%sp
        jbra    resume_userspace


/* This is the main interrupt handler for autovector interrupts */

ENTRY(auto_inthandler)
        SAVE_ALL_INT
        GET_CURRENT(%d0)
        addqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
                                        |  put exception # in d0
        bfextu  %sp@(PT_VECTOR){#4,#10},%d0
        subw    #VEC_SPUR,%d0

        movel   %sp,%sp@-
        movel   %d0,%sp@-               |  put vector # on stack
auto_irqhandler_fixup = . + 2
        jsr     __m68k_handle_int       |  process the IRQ
        addql   #8,%sp                  |  pop parameters off stack

ret_from_interrupt:
        subqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
        jeq     ret_from_last_interrupt
2:      RESTORE_ALL

        ALIGN
ret_from_last_interrupt:
        moveq   #(~ALLOWINT>>8)&0xff,%d0
        andb    %sp@(PT_SR),%d0
        jne     2b

        /* check if we need to do software interrupts */
        tstl    irq_stat+CPUSTAT_SOFTIRQ_PENDING
        jeq     .Lret_from_exception
        pea     ret_from_exception
        jra     do_softirq

/* Handler for user defined interrupt vectors */

ENTRY(user_inthandler)
        SAVE_ALL_INT
        GET_CURRENT(%d0)
        addqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
                                        |  put exception # in d0
        bfextu  %sp@(PT_VECTOR){#4,#10},%d0
user_irqvec_fixup = . + 2
        subw    #VEC_USER,%d0

        movel   %sp,%sp@-
        movel   %d0,%sp@-               |  put vector # on stack
user_irqhandler_fixup = . + 2
        jsr     __m68k_handle_int       |  process the IRQ
        addql   #8,%sp                  |  pop parameters off stack

        subqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
        jeq     ret_from_last_interrupt
        RESTORE_ALL

/* Handler for uninitialized and spurious interrupts */

ENTRY(bad_inthandler)
        SAVE_ALL_INT
        GET_CURRENT(%d0)
        addqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)

        movel   %sp,%sp@-
        jsr     handle_badint
        addql   #4,%sp

        subqb   #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
        jeq     ret_from_last_interrupt
        RESTORE_ALL


ENTRY(sys_fork)
        SAVE_SWITCH_STACK
        pea     %sp@(SWITCH_STACK_SIZE)
        jbsr    m68k_fork
        addql   #4,%sp
        RESTORE_SWITCH_STACK
        rts

ENTRY(sys_clone)
        SAVE_SWITCH_STACK
        pea     %sp@(SWITCH_STACK_SIZE)
        jbsr    m68k_clone
        addql   #4,%sp
        RESTORE_SWITCH_STACK
        rts

ENTRY(sys_vfork)
        SAVE_SWITCH_STACK
        pea     %sp@(SWITCH_STACK_SIZE)
        jbsr    m68k_vfork
        addql   #4,%sp
        RESTORE_SWITCH_STACK
        rts

ENTRY(sys_sigsuspend)
        SAVE_SWITCH_STACK
        pea     %sp@(SWITCH_STACK_SIZE)
        jbsr    do_sigsuspend
        addql   #4,%sp
        RESTORE_SWITCH_STACK
        rts

ENTRY(sys_rt_sigsuspend)
        SAVE_SWITCH_STACK
        pea     %sp@(SWITCH_STACK_SIZE)
        jbsr    do_rt_sigsuspend
        addql   #4,%sp
        RESTORE_SWITCH_STACK
        rts

ENTRY(sys_sigreturn)
        SAVE_SWITCH_STACK
        jbsr    do_sigreturn
        RESTORE_SWITCH_STACK
        rts

ENTRY(sys_rt_sigreturn)
        SAVE_SWITCH_STACK
        jbsr    do_rt_sigreturn
        RESTORE_SWITCH_STACK
        rts

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_THREAD+THREAD_SR)

        /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
        movec   %sfc,%d0
        movew   %d0,%a0@(TASK_THREAD+THREAD_FS)

        /* save usp */
        /* it is better to use a movel here instead of a movew 8*) */
        movec   %usp,%d0
        movel   %d0,%a0@(TASK_THREAD+THREAD_USP)

        /* save non-scratch registers on stack */
        SAVE_SWITCH_STACK

        /* save current kernel stack pointer */
        movel   %sp,%a0@(TASK_THREAD+THREAD_KSP)

        /* save floating point context */
#ifndef CONFIG_M68KFPU_EMU_ONLY
#ifdef CONFIG_M68KFPU_EMU
        tstl    m68k_fputype
        jeq     3f
#endif
        fsave   %a0@(TASK_THREAD+THREAD_FPSTATE)

#if defined(CONFIG_M68060)
#if !defined(CPU_M68060_ONLY)
        btst    #3,m68k_cputype+3
        beqs    1f
#endif
        /* The 060 FPU keeps status in bits 15-8 of the first longword */
        tstb    %a0@(TASK_THREAD+THREAD_FPSTATE+2)
        jeq     3f
#if !defined(CPU_M68060_ONLY)
        jra     2f
#endif
#endif /* CONFIG_M68060 */
#if !defined(CPU_M68060_ONLY)
1:      tstb    %a0@(TASK_THREAD+THREAD_FPSTATE)
        jeq     3f
#endif
2:      fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
        fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
3:
#endif  /* CONFIG_M68KFPU_EMU_ONLY */
        /* Return previous task in %d1 */
        movel   %curptr,%d1

        /* switch to new task (a1 contains new task) */
        movel   %a1,%curptr

        /* restore floating point context */
#ifndef CONFIG_M68KFPU_EMU_ONLY
#ifdef CONFIG_M68KFPU_EMU
        tstl    m68k_fputype
        jeq     4f
#endif
#if defined(CONFIG_M68060)
#if !defined(CPU_M68060_ONLY)
        btst    #3,m68k_cputype+3
        beqs    1f
#endif
        /* The 060 FPU keeps status in bits 15-8 of the first longword */
        tstb    %a1@(TASK_THREAD+THREAD_FPSTATE+2)
        jeq     3f
#if !defined(CPU_M68060_ONLY)
        jra     2f
#endif
#endif /* CONFIG_M68060 */
#if !defined(CPU_M68060_ONLY)
1:      tstb    %a1@(TASK_THREAD+THREAD_FPSTATE)
        jeq     3f
#endif
2:      fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
        fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
3:      frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
4:
#endif  /* CONFIG_M68KFPU_EMU_ONLY */

        /* restore the kernel stack pointer */
        movel   %a1@(TASK_THREAD+THREAD_KSP),%sp

        /* restore non-scratch registers */
        RESTORE_SWITCH_STACK

        /* restore user stack pointer */
        movel   %a1@(TASK_THREAD+THREAD_USP),%a0
        movel   %a0,%usp

        /* restore fs (sfc,%dfc) */
        movew   %a1@(TASK_THREAD+THREAD_FS),%a0
        movec   %a0,%sfc
        movec   %a0,%dfc

        /* restore status register */
        movew   %a1@(TASK_THREAD+THREAD_SR),%sr

        rts

.data
ALIGN
sys_call_table:
        .long sys_ni_syscall    /* 0  -  old "setup()" system call*/
        .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_chown16
        .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
        .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 old_select
        .long sys_symlink
        .long sys_lstat
        .long sys_readlink      /* 85 */
        .long sys_uselib
        .long sys_swapon
        .long sys_reboot
        .long 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 for i386 */
        .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
        .long sys_ni_syscall    /* 110 */       /* iopl for i386 */
        .long sys_vhangup
        .long sys_ni_syscall                            /* obsolete idle() syscall */
        .long sys_ni_syscall                            /* vm86old for i386 */
        .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_cacheflush                            /* modify_ldt for i386 */
        .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                            /* 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_getpagesize
        .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_lchown16;
        .long sys_getcwd
        .long sys_capget
        .long sys_capset        /* 185 */
        .long sys_sigaltstack
        .long sys_sendfile
        .long sys_ni_syscall                            /* streams1 */
        .long sys_ni_syscall                            /* streams2 */
        .long sys_vfork         /* 190 */
        .long sys_getrlimit
        .long sys_mmap2
        .long sys_truncate64
        .long sys_ftruncate64
        .long sys_stat64        /* 195 */
        .long sys_lstat64
        .long sys_fstat64
        .long sys_chown
        .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_lchown
        .long sys_setuid
        .long sys_setgid
        .long sys_setfsuid      /* 215 */
        .long sys_setfsgid
        .long sys_pivot_root
        .long sys_ni_syscall
        .long sys_ni_syscall
        .long sys_getdents64    /* 220 */
        .long sys_gettid
        .long sys_tkill
        .long sys_setxattr
        .long sys_lsetxattr
        .long sys_fsetxattr     /* 225 */
        .long sys_getxattr
        .long sys_lgetxattr
        .long sys_fgetxattr
        .long sys_listxattr
        .long sys_llistxattr    /* 230 */
        .long sys_flistxattr
        .long sys_removexattr
        .long sys_lremovexattr
        .long sys_fremovexattr
        .long sys_futex         /* 235 */
        .long sys_sendfile64
        .long sys_mincore
        .long sys_madvise
        .long sys_fcntl64
        .long sys_readahead     /* 240 */
        .long sys_io_setup
        .long sys_io_destroy
        .long sys_io_getevents
        .long sys_io_submit
        .long sys_io_cancel     /* 245 */
        .long sys_fadvise64
        .long sys_exit_group
        .long sys_lookup_dcookie
        .long sys_epoll_create
        .long sys_epoll_ctl     /* 250 */
        .long sys_epoll_wait
        .long sys_remap_file_pages
        .long sys_set_tid_address
        .long sys_timer_create
        .long sys_timer_settime /* 255 */
        .long sys_timer_gettime
        .long sys_timer_getoverrun
        .long sys_timer_delete
        .long sys_clock_settime
        .long sys_clock_gettime /* 260 */
        .long sys_clock_getres
        .long sys_clock_nanosleep
        .long sys_statfs64
        .long sys_fstatfs64
        .long sys_tgkill        /* 265 */
        .long sys_utimes
        .long sys_fadvise64_64
        .long sys_mbind
        .long sys_get_mempolicy
        .long sys_set_mempolicy /* 270 */
        .long sys_mq_open
        .long sys_mq_unlink
        .long sys_mq_timedsend
        .long sys_mq_timedreceive
        .long sys_mq_notify     /* 275 */
        .long sys_mq_getsetattr
        .long sys_waitid
        .long sys_ni_syscall    /* for sys_vserver */
        .long sys_add_key
        .long sys_request_key   /* 280 */
        .long sys_keyctl
        .long sys_ioprio_set
        .long sys_ioprio_get
        .long sys_inotify_init
        .long sys_inotify_add_watch     /* 285 */
        .long sys_inotify_rm_watch
        .long sys_migrate_pages
        .long sys_openat
        .long sys_mkdirat
        .long sys_mknodat               /* 290 */
        .long sys_fchownat
        .long sys_futimesat
        .long sys_fstatat64
        .long sys_unlinkat
        .long sys_renameat              /* 295 */
        .long sys_linkat
        .long sys_symlinkat
        .long sys_readlinkat
        .long sys_fchmodat
        .long sys_faccessat             /* 300 */
        .long sys_ni_syscall            /* Reserved for pselect6 */
        .long sys_ni_syscall            /* Reserved for ppoll */
        .long sys_unshare
        .long sys_set_robust_list
        .long sys_get_robust_list       /* 305 */
        .long sys_splice
        .long sys_sync_file_range
        .long sys_tee
        .long sys_vmsplice
        .long sys_move_pages            /* 310 */
        .long sys_sched_setaffinity
        .long sys_sched_getaffinity
        .long sys_kexec_load
        .long sys_getcpu
        .long sys_epoll_pwait           /* 315 */
        .long sys_utimensat
        .long sys_signalfd
        .long sys_timerfd
        .long sys_eventfd
        .long sys_fallocate             /* 320 */