/* -*- 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. * * Stack layout in 'ret_from_exception': * * This allows access to the syscall arguments in registers d1-d5 * * 0(sp) - d1 * 4(sp) - d2 * 8(sp) - d3 * C(sp) - d4 * 10(sp) - d5 * 14(sp) - a0 * 18(sp) - a1 * 1C(sp) - a2 * 20(sp) - d0 * 24(sp) - orig_d0 * 28(sp) - stack adjustment * 2C(sp) - sr * 2E(sp) - pc * 32(sp) - format & vector */ /* * 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. */ /* * 97/05/14 Andreas: Register %a2 is now set to the current task throughout * the whole kernel. */ #include #include #include #include #include #ifdef CONFIG_KGDB #include .globl SYMBOL_NAME(kgdb_registers) #endif #define curptr a2 LENOSYS = 38 /* * these are offsets into the task-struct */ LTASK_STATE = 0 LTASK_COUNTER = 4 LTASK_PRIORITY = 8 LTASK_SIGNAL = 12 LTASK_BLOCKED = 16 LTASK_FLAGS = 20 /* the following macro is used when enabling interrupts */ #if defined(MACH_ATARI_ONLY) /* block out HSYNC on the atari */ #define ALLOWINT 0xfbff #define MAX_NOINT_IPL 3 #else /* portable version */ #define ALLOWINT 0xf8ff #define MAX_NOINT_IPL 0 #endif /* machine compilation types */ LD0 = 0x20 LORIG_D0 = 0x24 LSR = 0x2C LFORMATVEC = 0x32 /* * This defines the normal kernel pt-regs layout. * * regs a3-a6 and d6-d7 are preserved by C code * the kernel doesn't mess with usp unless it needs to */ #ifndef CONFIG_KGDB #define SAVE_ALL \ clrl %sp@-; /* stk_adj */ \ movel %d0,%sp@-; /* orig d0 */ \ movel %d0,%sp@-; /* d0 */ \ moveml %d1-%d5/%a0-%a1/%curptr,%sp@-; #else /* Need to save the "missing" registers for kgdb... */ #define SAVE_ALL \ clrl %sp@-; /* stk_adj */ \ movel %d0,%sp@-; /* orig d0 */ \ movel %d0,%sp@-; /* d0 */ \ moveml %d1-%d5/%a0-%a1/%curptr,%sp@-; \ moveml %d6-%d7,SYMBOL_NAME(kgdb_registers)+GDBOFFA_D6; \ moveml %a3-%a6,SYMBOL_NAME(kgdb_registers)+GDBOFFA_A3; #endif #define RESTORE_ALL \ moveml %sp@+,%a0-%a1/%curptr/%d1-%d5; \ movel %sp@+,%d0; \ addql #4,%sp; /* orig d0 */ \ addl %sp@+,%sp; /* stk adj */ \ rte #define SWITCH_STACK_SIZE (6*4+4) /* includes return address */ #define SAVE_SWITCH_STACK \ moveml %a3-%a6/%d6-%d7,%sp@- #define RESTORE_SWITCH_STACK \ moveml %sp@+,%a3-%a6/%d6-%d7 #define GET_CURRENT(tmp) \ movel %sp,tmp; \ andw &-8192,tmp; \ movel tmp,%curptr; .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) .globl SYMBOL_NAME(ret_from_interrupt), SYMBOL_NAME(bad_interrupt) .text ENTRY(buserr) SAVE_ALL moveq #-1,%d0 movel %d0,%sp@(LORIG_D0) | a -1 in the ORIG_D0 field | signifies that the stack frame | is NOT for syscall 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 moveq #-1,%d0 movel %d0,%sp@(LORIG_D0) | a -1 in the ORIG_D0 field | signifies that the stack frame | is NOT for syscall 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 pea %sp@ jbsr SYMBOL_NAME(set_esp0) addql #4,%sp pea SYMBOL_NAME(ret_from_exception) jmp SYMBOL_NAME(schedule) badsys: movel #-LENOSYS,LD0(%sp) jra SYMBOL_NAME(ret_from_exception) do_trace: movel #-LENOSYS,LD0(%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@(LD0) | 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 movel %d0,%d2 GET_CURRENT(%d0) | save top of frame pea %sp@ jbsr SYMBOL_NAME(set_esp0) addql #4,%sp cmpl #NR_syscalls,%d2 jcc badsys btst #5,%curptr@(LTASK_FLAGS+3) | PF_TRACESYS jne do_trace jbsr @(SYMBOL_NAME(sys_call_table),%d2:l:4)@(0) movel %d0,%sp@(LD0) | save the return value SYMBOL_NAME_LABEL(ret_from_exception) btst #5,%sp@(LSR) | check if returning to kernel bnes 2f | if so, skip resched, signals tstl SYMBOL_NAME(need_resched) jne SYMBOL_NAME(reschedule) cmpl #SYMBOL_NAME(task),%curptr | task[0] cannot have signals jeq 2f bclr #5,%curptr@(LTASK_FLAGS+1) | check for delayed trace jne do_delayed_trace 5: tstl %curptr@(LTASK_STATE) | state jne SYMBOL_NAME(reschedule) tstl %curptr@(LTASK_COUNTER) | counter jeq SYMBOL_NAME(reschedule) movel %curptr@(LTASK_BLOCKED),%d0 movel %d0,%d1 | save blocked in d1 for sig handling notl %d0 btst #4,%curptr@(LTASK_FLAGS+3) | PF_PTRACED jeq 1f moveq #-1,%d0 | let the debugger see all signals 1: andl %curptr@(LTASK_SIGNAL),%d0 jne Lsignal_return 2: RESTORE_ALL Lsignal_return: subql #4,%sp | dummy return address SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) movel %d1,%sp@- bsrl SYMBOL_NAME(do_signal) addql #8,%sp RESTORE_SWITCH_STACK addql #4,%sp RESTORE_ALL do_delayed_trace: bclr #7,%sp@(LSR) | clear trace bit in SR pea 1 | send SIGTRAP movel %a0,%sp@- pea 5 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 moveq #-1,%d0 movel %d0,%sp@(LORIG_D0) | a -1 in the ORIG_D0 field | signifies that the stack frame | is NOT for syscall GET_CURRENT(%d0) addql #1,SYMBOL_NAME(local_irq_count) | put exception # in d0 bfextu %sp@(LFORMATVEC){#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@(LSR){#5,#3},%d0 | Check for nested interrupt. #if MAX_NOINT_IPL > 0 cmpiw #MAX_NOINT_IPL,%d0 #endif jhi 2b #endif /* Let the rest run with interrupts allowed. This is safe since the kernel never uses a non-standard ipl and this is the outer level interrupt. */ andw #ALLOWINT,%sr /* 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_sigsuspend) SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) jbsr SYMBOL_NAME(do_sigsuspend) addql #4,%sp RESTORE_SWITCH_STACK rts ENTRY(sys_sigreturn) SAVE_SWITCH_STACK jbsr SYMBOL_NAME(do_sigreturn) RESTORE_SWITCH_STACK rts LFLUSH_I_AND_D = 0x00000808 LTSS_KSP = 0 LTSS_USP = 4 LTSS_SR = 8 LTSS_FS = 10 LTSS_CRP = 12 LTSS_FPCTXT = 24 SYMBOL_NAME_LABEL(resume) /* * Beware - when entering resume, offset of tss is in d1, * prev (the current task) is in a0, next (the new task) * is in a1 and d2.b is non-zero if the mm structure is * shared between the tasks, so don't change these * registers until their contents are no longer needed. */ /* offset of tss struct (processor state) from beginning of task struct */ addl %d1,%a0 /* save sr */ movew %sr,%a0@(LTSS_SR) #if 0 /* disable interrupts */ oriw #0x0700,%sr #endif /* save fs (sfc,%dfc) (may be pointing to kernel memory) */ movec %sfc,%d0 movew %d0,%a0@(LTSS_FS) /* save usp */ /* it is better to use a movel here instead of a movew 8*) */ movec %usp,%d0 movel %d0,%a0@(LTSS_USP) /* save non-scratch registers on stack */ SAVE_SWITCH_STACK /* save current kernel stack pointer */ movel %sp,%a0@(LTSS_KSP) /* save floating point context */ fsave %a0@(LTSS_FPCTXT+27*4) #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@(LTSS_FPCTXT+27*4+2) jeq 3f #if !defined(CPU_M68060_ONLY) jra 2f #endif #endif /* CONFIG_M68060 */ #if !defined(CPU_M68060_ONLY) 1: tstb %a0@(LTSS_FPCTXT+27*4) jeq 3f #endif 2: fmovemx %fp0-%fp7,%a0@(LTSS_FPCTXT) fmoveml %fpcr/%fpsr/%fpiar,%a0@(LTSS_FPCTXT+24*4) 3: /* get pointer to tss struct (a1 contains new task) */ movel %a1,%curptr addl %d1,%a1 /* Skip address space switching if they are the same. */ tstb %d2 jne 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@(LTSS_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@(LTSS_CRP+4),%d0 movec %d0,%urp #if defined (CONFIG_M68060) /* is it a '060 ? */ btst #3,SYMBOL_NAME(m68k_cputype)+3 beqs 2f /* 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@(LTSS_FPCTXT+27*4+2) jeq 3f #if !defined(CPU_M68060_ONLY) jra 2f #endif #endif /* CONFIG_M68060 */ #if !defined(CPU_M68060_ONLY) 1: tstb %a1@(LTSS_FPCTXT+27*4) jeq 3f #endif 2: fmovemx %a1@(LTSS_FPCTXT),%fp0-%fp7 fmoveml %a1@(LTSS_FPCTXT+24*4),%fpcr/%fpsr/%fpiar 3: frestore %a1@(LTSS_FPCTXT+27*4) /* restore the kernel stack pointer */ movel %a1@(LTSS_KSP),%sp /* restore non-scratch registers */ RESTORE_SWITCH_STACK /* restore user stack pointer */ movel %a1@(LTSS_USP),%a0 movel %a0,%usp /* restore fs (sfc,%dfc) */ movew %a1@(LTSS_FS),%a0 movec %a0,%sfc movec %a0,%dfc /* restore status register */ movew %a1@(LTSS_SR),%sr rts .data ALIGN SYMBOL_NAME_LABEL(sys_call_table) .long SYMBOL_NAME(sys_setup) /* 0 */ .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_break) .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_umount) .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_stty) .long SYMBOL_NAME(sys_gtty) .long SYMBOL_NAME(sys_access) .long SYMBOL_NAME(sys_nice) .long SYMBOL_NAME(sys_ftime) /* 35 */ .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_prof) .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_phys) .long SYMBOL_NAME(sys_lock) .long SYMBOL_NAME(sys_ioctl) .long SYMBOL_NAME(sys_fcntl) /* 55 */ .long SYMBOL_NAME(sys_mpx) .long SYMBOL_NAME(sys_setpgid) .long SYMBOL_NAME(sys_ulimit) .long SYMBOL_NAME(sys_olduname) .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_profil) .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_uname) .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) .rept NR_syscalls-(.-SYMBOL_NAME(sys_call_table))/4 .long SYMBOL_NAME(sys_ni_syscall) .endr