Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid

[mirror_ubuntu-artful-kernel.git] / arch / blackfin / mach-common / 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.
 *
 * Copyright 2005-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

/* NOTE: This code handles signal-recognition, which happens every time
 * after a timer-interrupt and after each system call.
 */

#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/unistd.h>
#include <asm/blackfin.h>
#include <asm/errno.h>
#include <asm/fixed_code.h>
#include <asm/thread_info.h>  /* TIF_NEED_RESCHED */
#include <asm/asm-offsets.h>
#include <asm/trace.h>
#include <asm/traps.h>

#include <asm/context.S>

#if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
# define EX_SCRATCH_REG RETN
#elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
# define EX_SCRATCH_REG RETE
#else
# define EX_SCRATCH_REG CYCLES
#endif

#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
.section .l1.text
#else
.text
#endif

/* Slightly simplified and streamlined entry point for CPLB misses.
 * This one does not lower the level to IRQ5, and thus can be used to
 * patch up CPLB misses on the kernel stack.
 */
#if ANOMALY_05000261
#define _ex_dviol _ex_workaround_261
#define _ex_dmiss _ex_workaround_261
#define _ex_dmult _ex_workaround_261

ENTRY(_ex_workaround_261)
        /*
         * Work around an anomaly: if we see a new DCPLB fault, return
         * without doing anything.  Then, if we get the same fault again,
         * handle it.
         */
        P4 = R7;        /* Store EXCAUSE */

        GET_PDA(p5, r7);
        r7 = [p5 + PDA_LFRETX];
        r6 = retx;
        [p5 + PDA_LFRETX] = r6;
        cc = r6 == r7;
        if !cc jump _bfin_return_from_exception;
        /* fall through */
        R7 = P4;
        R6 = VEC_CPLB_M;        /* Data CPLB Miss */
        cc = R6 == R7;
        if cc jump _ex_dcplb_miss (BP);
#ifdef CONFIG_MPU
        R6 = VEC_CPLB_VL;       /* Data CPLB Violation */
        cc = R6 == R7;
        if cc jump _ex_dcplb_viol (BP);
#endif
        /* Handle Data CPLB Protection Violation
         * and Data CPLB Multiple Hits - Linux Trap Zero
         */
        jump _ex_trap_c;
ENDPROC(_ex_workaround_261)

#else
#ifdef CONFIG_MPU
#define _ex_dviol _ex_dcplb_viol
#else
#define _ex_dviol _ex_trap_c
#endif
#define _ex_dmiss _ex_dcplb_miss
#define _ex_dmult _ex_trap_c
#endif


ENTRY(_ex_dcplb_viol)
ENTRY(_ex_dcplb_miss)
ENTRY(_ex_icplb_miss)
        (R7:6,P5:4) = [sp++];
        /* We leave the previously pushed ASTAT on the stack.  */
        SAVE_CONTEXT_CPLB

        /* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
         * will change the stack pointer.  */
        R0 = SEQSTAT;
        R1 = SP;

        DEBUG_HWTRACE_SAVE(p5, r7)

        sp += -12;
        call _cplb_hdr;
        sp += 12;
        CC = R0 == 0;
        IF !CC JUMP _handle_bad_cplb;

#ifdef CONFIG_DEBUG_DOUBLEFAULT
        /* While we were processing this, did we double fault? */
        r7 = SEQSTAT;           /* reason code is in bit 5:0 */
        r6.l = lo(SEQSTAT_EXCAUSE);
        r6.h = hi(SEQSTAT_EXCAUSE);
        r7 = r7 & r6;
        r6 = 0x25;
        CC = R7 == R6;
        if CC JUMP _double_fault;
#endif

        DEBUG_HWTRACE_RESTORE(p5, r7)
        RESTORE_CONTEXT_CPLB
        ASTAT = [SP++];
        SP = EX_SCRATCH_REG;
        rtx;
ENDPROC(_ex_icplb_miss)

ENTRY(_ex_syscall)
        raise 15;               /* invoked by TRAP #0, for sys call */
        jump.s _bfin_return_from_exception;
ENDPROC(_ex_syscall)

ENTRY(_ex_single_step)
        /* If we just returned from an interrupt, the single step event is
           for the RTI instruction.  */
        r7 = retx;
        r6 = reti;
        cc = r7 == r6;
        if cc jump _bfin_return_from_exception;

#ifdef CONFIG_KGDB
        /* Don't do single step in hardware exception handler */
        p5.l = lo(IPEND);
        p5.h = hi(IPEND);
        r6 = [p5];
        cc = bittst(r6, 4);
        if cc jump _bfin_return_from_exception;
        cc = bittst(r6, 5);
        if cc jump _bfin_return_from_exception;

        /* skip single step if current interrupt priority is higher than
         * that of the first instruction, from which gdb starts single step */
        r6 >>= 6;
        r7 = 10;
.Lfind_priority_start:
        cc = bittst(r6, 0);
        if cc jump .Lfind_priority_done;
        r6 >>= 1;
        r7 += -1;
        cc = r7 == 0;
        if cc jump .Lfind_priority_done;
        jump.s .Lfind_priority_start;
.Lfind_priority_done:
        p4.l = _kgdb_single_step;
        p4.h = _kgdb_single_step;
        r6 = [p4];
        cc = r6 == 0;
        if cc jump .Ldo_single_step;
        r6 += -1;
        cc = r6 < r7;
        if cc jump 1f;
.Ldo_single_step:
#else
        /* If we were in user mode, do the single step normally.  */
        p5.l = lo(IPEND);
        p5.h = hi(IPEND);
        r6 = [p5];
        r7 = 0xffe0 (z);
        r7 = r7 & r6;
        cc = r7 == 0;
        if !cc jump 1f;
#endif
#ifdef CONFIG_EXACT_HWERR
        /* Read the ILAT, and to check to see if the process we are
         * single stepping caused a previous hardware error
         * If so, do not single step, (which lowers to IRQ5, and makes
         * us miss the error).
         */
        p5.l = lo(ILAT);
        p5.h = hi(ILAT);
        r7 = [p5];
        cc = bittst(r7, EVT_IVHW_P);
        if cc jump 1f;
#endif
        /* Single stepping only a single instruction, so clear the trace
         * bit here.  */
        r7 = syscfg;
        bitclr (r7, SYSCFG_SSSTEP_P);
        syscfg = R7;
        jump _ex_trap_c;

1:
        /*
         * We were in an interrupt handler.  By convention, all of them save
         * SYSCFG with their first instruction, so by checking whether our
         * RETX points at the entry point, we can determine whether to allow
         * a single step, or whether to clear SYSCFG.
         *
         * First, find out the interrupt level and the event vector for it.
         */
        p5.l = lo(EVT0);
        p5.h = hi(EVT0);
        p5 += -4;
2:
        r7 = rot r7 by -1;
        p5 += 4;
        if !cc jump 2b;

        /* What we actually do is test for the _second_ instruction in the
         * IRQ handler.  That way, if there are insns following the restore
         * of SYSCFG after leaving the handler, we will not turn off SYSCFG
         * for them.  */

        r7 = [p5];
        r7 += 2;
        r6 = RETX;
        cc = R7 == R6;
        if !cc jump _bfin_return_from_exception;

        r7 = syscfg;
        bitclr (r7, SYSCFG_SSSTEP_P);   /* Turn off single step */
        syscfg = R7;

        /* Fall through to _bfin_return_from_exception.  */
ENDPROC(_ex_single_step)

ENTRY(_bfin_return_from_exception)
#if ANOMALY_05000257
        R7=LC0;
        LC0=R7;
        R7=LC1;
        LC1=R7;
#endif

#ifdef CONFIG_DEBUG_DOUBLEFAULT
        /* While we were processing the current exception,
         * did we cause another, and double fault?
         */
        r7 = SEQSTAT;           /* reason code is in bit 5:0 */
        r6.l = lo(SEQSTAT_EXCAUSE);
        r6.h = hi(SEQSTAT_EXCAUSE);
        r7 = r7 & r6;
        r6 = VEC_UNCOV;
        CC = R7 == R6;
        if CC JUMP _double_fault;
#endif

        (R7:6,P5:4) = [sp++];
        ASTAT = [sp++];
        sp = EX_SCRATCH_REG;
        rtx;
ENDPROC(_bfin_return_from_exception)

ENTRY(_handle_bad_cplb)
        DEBUG_HWTRACE_RESTORE(p5, r7)
        /* To get here, we just tried and failed to change a CPLB
         * so, handle things in trap_c (C code), by lowering to
         * IRQ5, just like we normally do. Since this is not a
         * "normal" return path, we have a do a lot of stuff to
         * the stack to get ready so, we can fall through - we
         * need to make a CPLB exception look like a normal exception
         */
        RESTORE_CONTEXT_CPLB
        /* ASTAT is still on the stack, where it is needed.  */
        [--sp] = (R7:6,P5:4);

ENTRY(_ex_replaceable)
        nop;

ENTRY(_ex_trap_c)
        /* The only thing that has been saved in this context is
         * (R7:6,P5:4), ASTAT & SP - don't use anything else
         */

        GET_PDA(p5, r6);

        /* Make sure we are not in a double fault */
        p4.l = lo(IPEND);
        p4.h = hi(IPEND);
        r7 = [p4];
        CC = BITTST (r7, 5);
        if CC jump _double_fault;
        [p5 + PDA_EXIPEND] = r7;

        /* Call C code (trap_c) to handle the exception, which most
         * likely involves sending a signal to the current process.
         * To avoid double faults, lower our priority to IRQ5 first.
         */
        r7.h = _exception_to_level5;
        r7.l = _exception_to_level5;
        p4.l = lo(EVT5);
        p4.h = hi(EVT5);
        [p4] = r7;
        csync;

        /*
         * Save these registers, as they are only valid in exception context
         *  (where we are now - as soon as we defer to IRQ5, they can change)
         * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
         * but they are not very interesting, so don't save them
         */

        p4.l = lo(DCPLB_FAULT_ADDR);
        p4.h = hi(DCPLB_FAULT_ADDR);
        r7 = [p4];
        [p5 + PDA_DCPLB] = r7;

        p4.l = lo(ICPLB_FAULT_ADDR);
        p4.h = hi(ICPLB_FAULT_ADDR);
        r6 = [p4];
        [p5 + PDA_ICPLB] = r6;

        r6 = retx;
        [p5 + PDA_RETX] = r6;

        r6 = SEQSTAT;
        [p5 + PDA_SEQSTAT] = r6;

        /* Save the state of single stepping */
        r6 = SYSCFG;
        [p5 + PDA_SYSCFG] = r6;
        /* Clear it while we handle the exception in IRQ5 mode */
        BITCLR(r6, SYSCFG_SSSTEP_P);
        SYSCFG = r6;

        /* Save the current IMASK, since we change in order to jump to level 5 */
        cli r6;
        [p5 + PDA_EXIMASK] = r6;

        p4.l = lo(SAFE_USER_INSTRUCTION);
        p4.h = hi(SAFE_USER_INSTRUCTION);
        retx = p4;

        /* Disable all interrupts, but make sure level 5 is enabled so
         * we can switch to that level.
         */
        r6 = 0x3f;
        sti r6;

        /* In case interrupts are disabled IPEND[4] (global interrupt disable bit)
         * clear it (re-enabling interrupts again) by the special sequence of pushing
         * RETI onto the stack.  This way we can lower ourselves to IVG5 even if the
         * exception was taken after the interrupt handler was called but before it
         * got a chance to enable global interrupts itself.
         */
        [--sp] = reti;
        sp += 4;

        raise 5;
        jump.s _bfin_return_from_exception;
ENDPROC(_ex_trap_c)

/* We just realized we got an exception, while we were processing a different
 * exception. This is a unrecoverable event, so crash.
 * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
 */
ENTRY(_double_fault)
        /* Turn caches & protection off, to ensure we don't get any more
         * double exceptions
         */

        P4.L = LO(IMEM_CONTROL);
        P4.H = HI(IMEM_CONTROL);

        R5 = [P4];              /* Control Register*/
        BITCLR(R5,ENICPLB_P);
        CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
        [P4] = R5;
        SSYNC;

        P4.L = LO(DMEM_CONTROL);
        P4.H = HI(DMEM_CONTROL);
        R5 = [P4];
        BITCLR(R5,ENDCPLB_P);
        CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
        [P4] = R5;
        SSYNC;

        /* Fix up the stack */
        (R7:6,P5:4) = [sp++];
        ASTAT = [sp++];
        SP = EX_SCRATCH_REG;

        /* We should be out of the exception stack, and back down into
         * kernel or user space stack
         */
        SAVE_ALL_SYS

        /* The dumping functions expect the return address in the RETI
         * slot.  */
        r6 = retx;
        [sp + PT_PC] = r6;

        r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
        SP += -12;
        pseudo_long_call _double_fault_c, p5;
        SP += 12;
.L_double_fault_panic:
        JUMP .L_double_fault_panic

ENDPROC(_double_fault)

ENTRY(_exception_to_level5)
        SAVE_ALL_SYS

        GET_PDA(p5, r7);        /* Fetch current PDA */
        r6 = [p5 + PDA_RETX];
        [sp + PT_PC] = r6;

        r6 = [p5 + PDA_SYSCFG];
        [sp + PT_SYSCFG] = r6;

        r6 = [p5 + PDA_SEQSTAT]; /* Read back seqstat */
        [sp + PT_SEQSTAT] = r6;

        /* Restore the hardware error vector.  */
        r7.h = _evt_ivhw;
        r7.l = _evt_ivhw;
        p4.l = lo(EVT5);
        p4.h = hi(EVT5);
        [p4] = r7;
        csync;

#ifdef CONFIG_DEBUG_DOUBLEFAULT
        /* Now that we have the hardware error vector programmed properly
         * we can re-enable interrupts (IPEND[4]), so if the _trap_c causes
         * another hardware error, we can catch it (self-nesting).
         */
        [--sp] = reti;
        sp += 4;
#endif

        r7 = [p5 + PDA_EXIPEND] /* Read the IPEND from the Exception state */
        [sp + PT_IPEND] = r7;   /* Store IPEND onto the stack */

        r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
        SP += -12;
        pseudo_long_call _trap_c, p4;
        SP += 12;

        /* If interrupts were off during the exception (IPEND[4] = 1), turn them off
         * before we return.
         */
        CC = BITTST(r7, EVT_IRPTEN_P)
        if !CC jump 1f;
        /* this will load a random value into the reti register - but that is OK,
         * since we do restore it to the correct value in the 'RESTORE_ALL_SYS' macro
         */
        sp += -4;
        reti = [sp++];
1:
        /* restore the interrupt mask (IMASK) */
        r6 = [p5 + PDA_EXIMASK];
        sti r6;

        call _ret_from_exception;
        RESTORE_ALL_SYS
        rti;
ENDPROC(_exception_to_level5)

ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
        /* Since the kernel stack can be anywhere, it's not guaranteed to be
         * covered by a CPLB.  Switch to an exception stack; use RETN as a
         * scratch register (for want of a better option).
         */
        EX_SCRATCH_REG = sp;
        GET_PDA_SAFE(sp);
        sp = [sp + PDA_EXSTACK];
        /* Try to deal with syscalls quickly.  */
        [--sp] = ASTAT;
        [--sp] = (R7:6,P5:4);

        ANOMALY_283_315_WORKAROUND(p5, r7)

#ifdef CONFIG_EXACT_HWERR
        /* Make sure all pending read/writes complete. This will ensure any
         * accesses which could cause hardware errors completes, and signal
         * the the hardware before we do something silly, like crash the
         * kernel. We don't need to work around anomaly 05000312, since
         * we are already atomic
         */
        ssync;
#endif

#ifdef CONFIG_DEBUG_DOUBLEFAULT
        /*
         * Save these registers, as they are only valid in exception context
         * (where we are now - as soon as we defer to IRQ5, they can change)
         * DCPLB_STATUS and ICPLB_STATUS are also only valid in EVT3,
         * but they are not very interesting, so don't save them
         */

        GET_PDA(p5, r7);
        p4.l = lo(DCPLB_FAULT_ADDR);
        p4.h = hi(DCPLB_FAULT_ADDR);
        r7 = [p4];
        [p5 + PDA_DF_DCPLB] = r7;

        p4.l = lo(ICPLB_FAULT_ADDR);
        p4.h = hi(ICPLB_FAULT_ADDR);
        r7 = [p4];
        [p5 + PDA_DF_ICPLB] = r7;

        r7 = retx;
        [p5 + PDA_DF_RETX] = r7;

        r7 = SEQSTAT;           /* reason code is in bit 5:0 */
        [p5 + PDA_DF_SEQSTAT] = r7;
#else
        r7 = SEQSTAT;           /* reason code is in bit 5:0 */
#endif
        r6.l = lo(SEQSTAT_EXCAUSE);
        r6.h = hi(SEQSTAT_EXCAUSE);
        r7 = r7 & r6;
        p5.h = _ex_table;
        p5.l = _ex_table;
        p4 = r7;
        p5 = p5 + (p4 << 2);
        p4 = [p5];
        jump (p4);

.Lbadsys:
        r7 = -ENOSYS;           /* signextending enough */
        [sp + PT_R0] = r7;      /* return value from system call */
        jump .Lsyscall_really_exit;
ENDPROC(_trap)

ENTRY(_kernel_execve)
        link SIZEOF_PTREGS;
        p0 = sp;
        r3 = SIZEOF_PTREGS / 4;
        r4 = 0(x);
.Lclear_regs:
        [p0++] = r4;
        r3 += -1;
        cc = r3 == 0;
        if !cc jump .Lclear_regs (bp);

        p0 = sp;
        sp += -16;
        [sp + 12] = p0;
        pseudo_long_call _do_execve, p5;
        SP += 16;
        cc = r0 == 0;
        if ! cc jump .Lexecve_failed;
        /* Success.  Copy our temporary pt_regs to the top of the kernel
         * stack and do a normal exception return.
         */
        r1 = sp;
        r0 = (-KERNEL_STACK_SIZE) (x);
        r1 = r1 & r0;
        p2 = r1;
        p3 = [p2];
        r0 = KERNEL_STACK_SIZE - 4 (z);
        p1 = r0;
        p1 = p1 + p2;

        p0 = fp;
        r4 = [p0--];
        r3 = SIZEOF_PTREGS / 4;
.Lcopy_regs:
        r4 = [p0--];
        [p1--] = r4;
        r3 += -1;
        cc = r3 == 0;
        if ! cc jump .Lcopy_regs (bp);

        r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
        p1 = r0;
        p1 = p1 + p2;
        sp = p1;
        r0 = syscfg;
        [SP + PT_SYSCFG] = r0;
        [p3 + (TASK_THREAD + THREAD_KSP)] = sp;

        RESTORE_CONTEXT;
        rti;
.Lexecve_failed:
        unlink;
        rts;
ENDPROC(_kernel_execve)

ENTRY(_system_call)
        /* Store IPEND */
        p2.l = lo(IPEND);
        p2.h = hi(IPEND);
        csync;
        r0 = [p2];
        [sp + PT_IPEND] = r0;

        /* Store RETS for now */
        r0 = rets;
        [sp + PT_RESERVED] = r0;
        /* Set the stack for the current process */
        r7 = sp;
        r6.l = lo(ALIGN_PAGE_MASK);
        r6.h = hi(ALIGN_PAGE_MASK);
        r7 = r7 & r6;           /* thread_info */
        p2 = r7;
        p2 = [p2];

        [p2+(TASK_THREAD+THREAD_KSP)] = sp;
#ifdef CONFIG_IPIPE
        r0 = sp;
        SP += -12;
        pseudo_long_call ___ipipe_syscall_root, p0;
        SP += 12;
        cc = r0 == 1;
        if cc jump .Lsyscall_really_exit;
        cc = r0 == -1;
        if cc jump .Lresume_userspace;
        r3 = [sp + PT_R3];
        r4 = [sp + PT_R4];
        p0 = [sp + PT_ORIG_P0];
#endif /* CONFIG_IPIPE */

        /* are we tracing syscalls?*/
        r7 = sp;
        r6.l = lo(ALIGN_PAGE_MASK);
        r6.h = hi(ALIGN_PAGE_MASK);
        r7 = r7 & r6;
        p2 = r7;
        r7 = [p2+TI_FLAGS];
        CC = BITTST(r7,TIF_SYSCALL_TRACE);
        if CC JUMP _sys_trace;
        CC = BITTST(r7,TIF_SINGLESTEP);
        if CC JUMP _sys_trace;

        /* Make sure the system call # is valid */
        p4 = __NR_syscall;
        /* System call number is passed in P0 */
        cc = p4 <= p0;
        if cc jump .Lbadsys;

        /* Execute the appropriate system call */

        p4 = p0;
        p5.l = _sys_call_table;
        p5.h = _sys_call_table;
        p5 = p5 + (p4 << 2);
        r0 = [sp + PT_R0];
        r1 = [sp + PT_R1];
        r2 = [sp + PT_R2];
        p5 = [p5];

        [--sp] = r5;
        [--sp] = r4;
        [--sp] = r3;
        SP += -12;
        call (p5);
        SP += 24;
        [sp + PT_R0] = r0;

.Lresume_userspace:
        r7 = sp;
        r4.l = lo(ALIGN_PAGE_MASK);
        r4.h = hi(ALIGN_PAGE_MASK);
        r7 = r7 & r4;           /* thread_info->flags */
        p5 = r7;
.Lresume_userspace_1:
        /* Disable interrupts.  */
        [--sp] = reti;
        reti = [sp++];

        r7 = [p5 + TI_FLAGS];
        r4.l = lo(_TIF_WORK_MASK);
        r4.h = hi(_TIF_WORK_MASK);
        r7 =  r7 & r4;

.Lsyscall_resched:
#ifdef CONFIG_IPIPE
        cc = BITTST(r7, TIF_IRQ_SYNC);
        if !cc jump .Lsyscall_no_irqsync;
        /*
         * Clear IPEND[4] manually to undo what resume_userspace_1 just did;
         * we need this so that high priority domain interrupts may still
         * preempt the current domain while the pipeline log is being played
         * back.
         */
        [--sp] = reti;
        SP += 4; /* don't merge with next insn to keep the pattern obvious */
        SP += -12;
        pseudo_long_call ___ipipe_sync_root, p4;
        SP += 12;
        jump .Lresume_userspace_1;
.Lsyscall_no_irqsync:
#endif
        cc = BITTST(r7, TIF_NEED_RESCHED);
        if !cc jump .Lsyscall_sigpending;

        /* Reenable interrupts.  */
        [--sp] = reti;
        sp += 4;

        SP += -12;
        pseudo_long_call _schedule, p4;
        SP += 12;

        jump .Lresume_userspace_1;

.Lsyscall_sigpending:
        cc = BITTST(r7, TIF_RESTORE_SIGMASK);
        if cc jump .Lsyscall_do_signals;
        cc = BITTST(r7, TIF_SIGPENDING);
        if cc jump .Lsyscall_do_signals;
        cc = BITTST(r7, TIF_NOTIFY_RESUME);
        if !cc jump .Lsyscall_really_exit;
.Lsyscall_do_signals:
        /* Reenable interrupts.  */
        [--sp] = reti;
        sp += 4;

        r0 = sp;
        SP += -12;
        pseudo_long_call _do_notify_resume, p5;
        SP += 12;

.Lsyscall_really_exit:
        r5 = [sp + PT_RESERVED];
        rets = r5;
        rts;
ENDPROC(_system_call)

/* Do not mark as ENTRY() to avoid error in assembler ...
 * this symbol need not be global anyways, so ...
 */
_sys_trace:
        r0 = sp;
        pseudo_long_call _syscall_trace_enter, p5;

        /* Make sure the system call # is valid */
        p4 = [SP + PT_P0];
        p3 = __NR_syscall;
        cc = p3 <= p4;
        r0 = -ENOSYS;
        if cc jump .Lsys_trace_badsys;

        /* Execute the appropriate system call */
        p5.l = _sys_call_table;
        p5.h = _sys_call_table;
        p5 = p5 + (p4 << 2);
        r0 = [sp + PT_R0];
        r1 = [sp + PT_R1];
        r2 = [sp + PT_R2];
        r3 = [sp + PT_R3];
        r4 = [sp + PT_R4];
        r5 = [sp + PT_R5];
        p5 = [p5];

        [--sp] = r5;
        [--sp] = r4;
        [--sp] = r3;
        SP += -12;
        call (p5);
        SP += 24;
.Lsys_trace_badsys:
        [sp + PT_R0] = r0;

        r0 = sp;
        pseudo_long_call _syscall_trace_leave, p5;
        jump .Lresume_userspace;
ENDPROC(_sys_trace)

ENTRY(_resume)
        /*
         * Beware - when entering resume, prev (the current task) is
         * in r0, next (the new task) is in r1.
         */
        p0 = r0;
        p1 = r1;
        [--sp] = rets;
        [--sp] = fp;
        [--sp] = (r7:4, p5:3);

        /* save usp */
        p2 = usp;
        [p0+(TASK_THREAD+THREAD_USP)] = p2;

        /* save current kernel stack pointer */
        [p0+(TASK_THREAD+THREAD_KSP)] = sp;

        /* save program counter */
        r1.l = _new_old_task;
        r1.h = _new_old_task;
        [p0+(TASK_THREAD+THREAD_PC)] = r1;

        /* restore the kernel stack pointer */
        sp = [p1+(TASK_THREAD+THREAD_KSP)];

        /* restore user stack pointer */
        p0 = [p1+(TASK_THREAD+THREAD_USP)];
        usp = p0;

        /* restore pc */
        p0 = [p1+(TASK_THREAD+THREAD_PC)];
        jump (p0);

        /*
         * Following code actually lands up in a new (old) task.
         */

_new_old_task:
        (r7:4, p5:3) = [sp++];
        fp = [sp++];
        rets = [sp++];

        /*
         * When we come out of resume, r0 carries "old" task, because we are
         * in "new" task.
         */
        rts;
ENDPROC(_resume)

ENTRY(_ret_from_exception)
#ifdef CONFIG_IPIPE
        p2.l = _ipipe_percpu_domain;
        p2.h = _ipipe_percpu_domain;
        r0.l = _ipipe_root;
        r0.h = _ipipe_root;
        r2 = [p2];
        cc = r0 == r2;
        if !cc jump 4f;  /* not on behalf of the root domain, get out */
#endif /* CONFIG_IPIPE */
        p2.l = lo(IPEND);
        p2.h = hi(IPEND);

        csync;
        r0 = [p2];
        [sp + PT_IPEND] = r0;

1:
        r2 = LO(~0x37) (Z);
        r0 = r2 & r0;
        cc = r0 == 0;
        if !cc jump 4f; /* if not return to user mode, get out */

        /* Make sure any pending system call or deferred exception
         * return in ILAT for this process to get executed, otherwise
         * in case context switch happens, system call of
         * first process (i.e in ILAT) will be carried
         * forward to the switched process
         */

        p2.l = lo(ILAT);
        p2.h = hi(ILAT);
        r0 = [p2];
        r1 = (EVT_IVG14 | EVT_IVG15) (z);
        r0 = r0 & r1;
        cc = r0 == 0;
        if !cc jump 5f;

        /* Set the stack for the current process */
        r7 = sp;
        r4.l = lo(ALIGN_PAGE_MASK);
        r4.h = hi(ALIGN_PAGE_MASK);
        r7 = r7 & r4;           /* thread_info->flags */
        p5 = r7;
        r7 = [p5 + TI_FLAGS];
        r4.l = lo(_TIF_WORK_MASK);
        r4.h = hi(_TIF_WORK_MASK);
        r7 =  r7 & r4;
        cc = r7 == 0;
        if cc jump 4f;

        p0.l = lo(EVT15);
        p0.h = hi(EVT15);
        p1.l = _schedule_and_signal;
        p1.h = _schedule_and_signal;
        [p0] = p1;
        csync;
        raise 15;               /* raise evt15 to do signal or reschedule */
4:
        r0 = syscfg;
        bitclr(r0, SYSCFG_SSSTEP_P);            /* Turn off single step */
        syscfg = r0;
5:
        rts;
ENDPROC(_ret_from_exception)

#if defined(CONFIG_PREEMPT)

ENTRY(_up_to_irq14)
#if ANOMALY_05000281 || ANOMALY_05000461
        r0.l = lo(SAFE_USER_INSTRUCTION);
        r0.h = hi(SAFE_USER_INSTRUCTION);
        reti = r0;
#endif

#ifdef CONFIG_DEBUG_HWERR
        /* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */
        r0 = (EVT_IVG14 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
#else
        /* Only enable irq14 interrupt, until we transition to _evt_evt14 */
        r0 = (EVT_IVG14 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
#endif
        sti r0;

        p0.l = lo(EVT14);
        p0.h = hi(EVT14);
        p1.l = _evt_up_evt14;
        p1.h = _evt_up_evt14;
        [p0] = p1;
        csync;

        raise 14;
1:
        jump 1b;
ENDPROC(_up_to_irq14)

ENTRY(_evt_up_evt14)
#ifdef CONFIG_DEBUG_HWERR
        r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
        sti r0;
#else
        cli r0;
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
        [--sp] = rets;
        sp += -12;
        call _trace_hardirqs_off;
        sp += 12;
        rets = [sp++];
#endif
        [--sp] = RETI;
        SP += 4;

        /* restore normal evt14 */
        p0.l = lo(EVT14);
        p0.h = hi(EVT14);
        p1.l = _evt_evt14;
        p1.h = _evt_evt14;
        [p0] = p1;
        csync;

        rts;
ENDPROC(_evt_up_evt14)

#endif

#ifdef CONFIG_IPIPE

_resume_kernel_from_int:
        r1 = LO(~0x8000) (Z);
        r1 = r0 & r1;
        r0 = 1;
        r0 = r1 - r0;
        r2 = r1 & r0;
        cc = r2 == 0;
        /* Sync the root stage only from the outer interrupt level. */
        if !cc jump .Lnosync;
        r0.l = ___ipipe_sync_root;
        r0.h = ___ipipe_sync_root;
        [--sp] = reti;
        [--sp] = rets;
        [--sp] = ( r7:4, p5:3 );
        SP += -12;
        call ___ipipe_call_irqtail
        SP += 12;
        ( r7:4, p5:3 ) = [sp++];
        rets = [sp++];
        reti = [sp++];
.Lnosync:
        rts
#elif defined(CONFIG_PREEMPT)

_resume_kernel_from_int:
        /* check preempt_count */
        r7 = sp;
        r4.l = lo(ALIGN_PAGE_MASK);
        r4.h = hi(ALIGN_PAGE_MASK);
        r7 = r7 & r4;
        p5 = r7;
        r7 = [p5 + TI_PREEMPT];
        cc = r7 == 0x0;
        if !cc jump .Lreturn_to_kernel;
.Lneed_schedule:
        r7 = [p5 + TI_FLAGS];
        r4.l = lo(_TIF_WORK_MASK);
        r4.h = hi(_TIF_WORK_MASK);
        r7 =  r7 & r4;
        cc = BITTST(r7, TIF_NEED_RESCHED);
        if !cc jump .Lreturn_to_kernel;
        /*
         * let schedule done at level 15, otherwise sheduled process will run
         * at high level and block low level interrupt
         */
        r6 = reti;  /* save reti */
        r5.l = .Lkernel_schedule;
        r5.h = .Lkernel_schedule;
        reti = r5;
        rti;
.Lkernel_schedule:
        [--sp] = rets;
        sp += -12;
        pseudo_long_call _preempt_schedule_irq, p4;
        sp += 12;
        rets = [sp++];

        [--sp] = rets;
        sp += -12;
        /* up to irq14 so that reti after restore_all can return to irq15(kernel) */
        pseudo_long_call _up_to_irq14, p4;
        sp += 12;
        rets = [sp++];

        reti = r6; /* restore reti so that origin process can return to interrupted point */

        jump .Lneed_schedule;
#else

#define _resume_kernel_from_int .Lreturn_to_kernel
#endif

ENTRY(_return_from_int)
        /* If someone else already raised IRQ 15, do nothing.  */
        csync;
        p2.l = lo(ILAT);
        p2.h = hi(ILAT);
        r0 = [p2];
        cc = bittst (r0, EVT_IVG15_P);
        if cc jump .Lreturn_to_kernel;

        /* if not return to user mode, get out */
        p2.l = lo(IPEND);
        p2.h = hi(IPEND);
        r0 = [p2];
        r1 = 0x17(Z);
        r2 = ~r1;
        r2.h = 0;
        r0 = r2 & r0;
        r1 = 1;
        r1 = r0 - r1;
        r2 = r0 & r1;
        cc = r2 == 0;
        if !cc jump _resume_kernel_from_int;

        /* Lower the interrupt level to 15.  */
        p0.l = lo(EVT15);
        p0.h = hi(EVT15);
        p1.l = _schedule_and_signal_from_int;
        p1.h = _schedule_and_signal_from_int;
        [p0] = p1;
        csync;
#if ANOMALY_05000281 || ANOMALY_05000461
        r0.l = lo(SAFE_USER_INSTRUCTION);
        r0.h = hi(SAFE_USER_INSTRUCTION);
        reti = r0;
#endif
        r0 = 0x801f (z);
        STI r0;
        raise 15;       /* raise evt15 to do signal or reschedule */
        rti;
.Lreturn_to_kernel:
        rts;
ENDPROC(_return_from_int)

ENTRY(_lower_to_irq14)
#if ANOMALY_05000281 || ANOMALY_05000461
        r0.l = lo(SAFE_USER_INSTRUCTION);
        r0.h = hi(SAFE_USER_INSTRUCTION);
        reti = r0;
#endif

#ifdef CONFIG_DEBUG_HWERR
        /* enable irq14 & hwerr interrupt, until we transition to _evt_evt14 */
        r0 = (EVT_IVG14 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
#else
        /* Only enable irq14 interrupt, until we transition to _evt_evt14 */
        r0 = (EVT_IVG14 | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
#endif
        sti r0;
        raise 14;
        rti;
ENDPROC(_lower_to_irq14)

ENTRY(_evt_evt14)
#ifdef CONFIG_DEBUG_HWERR
        r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
        sti r0;
#else
        cli r0;
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
        [--sp] = rets;
        sp += -12;
        call _trace_hardirqs_off;
        sp += 12;
        rets = [sp++];
#endif
        [--sp] = RETI;
        SP += 4;
        rts;
ENDPROC(_evt_evt14)

ENTRY(_schedule_and_signal_from_int)
        /* To end up here, vector 15 was changed - so we have to change it
         * back.
         */
        p0.l = lo(EVT15);
        p0.h = hi(EVT15);
        p1.l = _evt_system_call;
        p1.h = _evt_system_call;
        [p0] = p1;
        csync;

        /* Set orig_p0 to -1 to indicate this isn't the end of a syscall.  */
        r0 = -1 (x);
        [sp + PT_ORIG_P0] = r0;

        p1 = rets;
        [sp + PT_RESERVED] = p1;

#ifdef CONFIG_TRACE_IRQFLAGS
        /* trace_hardirqs_on() checks if all irqs are disabled. But here IRQ 15
         * is turned on, so disable all irqs. */
        cli r0;
        sp += -12;
        call _trace_hardirqs_on;
        sp += 12;
#endif
#ifdef CONFIG_SMP
        GET_PDA(p0, r0);        /* Fetch current PDA (can't migrate to other CPU here) */
        r0 = [p0 + PDA_IRQFLAGS];
#else
        p0.l = _bfin_irq_flags;
        p0.h = _bfin_irq_flags;
        r0 = [p0];
#endif
        sti r0;

        /* finish the userspace "atomic" functions for it */
        r1 = FIXED_CODE_END;
        r2 = [sp + PT_PC];
        cc = r1 <= r2;
        if cc jump .Lresume_userspace (bp);

        r0 = sp;
        sp += -12;

        pseudo_long_call _finish_atomic_sections, p5;
        sp += 12;
        jump.s .Lresume_userspace;
ENDPROC(_schedule_and_signal_from_int)

ENTRY(_schedule_and_signal)
        SAVE_CONTEXT_SYSCALL
        /* To end up here, vector 15 was changed - so we have to change it
         * back.
         */
        p0.l = lo(EVT15);
        p0.h = hi(EVT15);
        p1.l = _evt_system_call;
        p1.h = _evt_system_call;
        [p0] = p1;
        csync;
        p0.l = 1f;
        p0.h = 1f;
        [sp + PT_RESERVED] = P0;
        call .Lresume_userspace;
1:
        RESTORE_CONTEXT
        rti;
ENDPROC(_schedule_and_signal)

/* We handle this 100% in exception space - to reduce overhead
 * Only potiential problem is if the software buffer gets swapped out of the
 * CPLB table - then double fault. - so we don't let this happen in other places
 */
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
ENTRY(_ex_trace_buff_full)
        [--sp] = P3;
        [--sp] = P2;
        [--sp] = LC0;
        [--sp] = LT0;
        [--sp] = LB0;
        P5.L = _trace_buff_offset;
        P5.H = _trace_buff_offset;
        P3 = [P5];              /* trace_buff_offset */
        P5.L = lo(TBUFSTAT);
        P5.H = hi(TBUFSTAT);
        R7 = [P5];
        R7 <<= 1;               /* double, since we need to read twice */
        LC0 = R7;
        R7 <<= 2;               /* need to shift over again,
                                 * to get the number of bytes */
        P5.L = lo(TBUF);
        P5.H = hi(TBUF);
        R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;

        P2 = R7;
        P3 = P3 + P2;
        R7 = P3;
        R7 = R7 & R6;
        P3 = R7;
        P2.L = _trace_buff_offset;
        P2.H = _trace_buff_offset;
        [P2] = P3;

        P2.L = _software_trace_buff;
        P2.H = _software_trace_buff;

        LSETUP (.Lstart, .Lend) LC0;
.Lstart:
        R7 = [P5];      /* read TBUF */
        P4 = P3 + P2;
        [P4] = R7;
        P3 += -4;
        R7 = P3;
        R7 = R7 & R6;
.Lend:
        P3 = R7;

        LB0 = [sp++];
        LT0 = [sp++];
        LC0 = [sp++];
        P2 = [sp++];
        P3 = [sp++];
        jump _bfin_return_from_exception;
ENDPROC(_ex_trace_buff_full)

#if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
.data
#else
.section .l1.data.B
#endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
ENTRY(_trace_buff_offset)
        .long 0;
ALIGN
ENTRY(_software_trace_buff)
        .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
        .long 0
        .endr
#endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */

#if CONFIG_EARLY_PRINTK
__INIT
ENTRY(_early_trap)
        SAVE_ALL_SYS
        trace_buffer_stop(p0,r0);

        ANOMALY_283_315_WORKAROUND(p4, r5)

        /* Turn caches off, to ensure we don't get double exceptions */

        P4.L = LO(IMEM_CONTROL);
        P4.H = HI(IMEM_CONTROL);

        R5 = [P4];              /* Control Register*/
        BITCLR(R5,ENICPLB_P);
        CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
        [P4] = R5;
        SSYNC;

        P4.L = LO(DMEM_CONTROL);
        P4.H = HI(DMEM_CONTROL);
        R5 = [P4];
        BITCLR(R5,ENDCPLB_P);
        CSYNC;          /* Disabling of CPLBs should be proceeded by a CSYNC */
        [P4] = R5;
        SSYNC;

        r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
        r1 = RETX;

        SP += -12;
        call _early_trap_c;
        SP += 12;
ENDPROC(_early_trap)
__FINIT
#endif /* CONFIG_EARLY_PRINTK */

/*
 * Put these in the kernel data section - that should always be covered by
 * a CPLB. This is needed to ensure we don't get double fault conditions
 */

#ifdef CONFIG_SYSCALL_TAB_L1
.section .l1.data
#else
.data
#endif

ENTRY(_ex_table)
        /* entry for each EXCAUSE[5:0]
         * This table must be in sync with the table in ./kernel/traps.c
         * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
         */
        .long _ex_syscall       /* 0x00 - User Defined - Linux Syscall */
        .long _ex_trap_c        /* 0x01 - User Defined - Software breakpoint */
#ifdef  CONFIG_KGDB
        .long _ex_trap_c        /* 0x02 - User Defined - KGDB initial connection
                                                         and break signal trap */
#else
        .long _ex_replaceable   /* 0x02 - User Defined */
#endif
        .long _ex_trap_c        /* 0x03 - User Defined - userspace stack overflow */
        .long _ex_trap_c        /* 0x04 - User Defined - dump trace buffer */
        .long _ex_replaceable   /* 0x05 - User Defined */
        .long _ex_replaceable   /* 0x06 - User Defined */
        .long _ex_replaceable   /* 0x07 - User Defined */
        .long _ex_replaceable   /* 0x08 - User Defined */
        .long _ex_replaceable   /* 0x09 - User Defined */
        .long _ex_replaceable   /* 0x0A - User Defined */
        .long _ex_replaceable   /* 0x0B - User Defined */
        .long _ex_replaceable   /* 0x0C - User Defined */
        .long _ex_replaceable   /* 0x0D - User Defined */
        .long _ex_replaceable   /* 0x0E - User Defined */
        .long _ex_replaceable   /* 0x0F - User Defined */
        .long _ex_single_step   /* 0x10 - HW Single step */
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
        .long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
#else
        .long _ex_trap_c        /* 0x11 - Trace Buffer Full */
#endif
        .long _ex_trap_c        /* 0x12 - Reserved */
        .long _ex_trap_c        /* 0x13 - Reserved */
        .long _ex_trap_c        /* 0x14 - Reserved */
        .long _ex_trap_c        /* 0x15 - Reserved */
        .long _ex_trap_c        /* 0x16 - Reserved */
        .long _ex_trap_c        /* 0x17 - Reserved */
        .long _ex_trap_c        /* 0x18 - Reserved */
        .long _ex_trap_c        /* 0x19 - Reserved */
        .long _ex_trap_c        /* 0x1A - Reserved */
        .long _ex_trap_c        /* 0x1B - Reserved */
        .long _ex_trap_c        /* 0x1C - Reserved */
        .long _ex_trap_c        /* 0x1D - Reserved */
        .long _ex_trap_c        /* 0x1E - Reserved */
        .long _ex_trap_c        /* 0x1F - Reserved */
        .long _ex_trap_c        /* 0x20 - Reserved */
        .long _ex_trap_c        /* 0x21 - Undefined Instruction */
        .long _ex_trap_c        /* 0x22 - Illegal Instruction Combination */
        .long _ex_dviol         /* 0x23 - Data CPLB Protection Violation */
        .long _ex_trap_c        /* 0x24 - Data access misaligned */
        .long _ex_trap_c        /* 0x25 - Unrecoverable Event */
        .long _ex_dmiss         /* 0x26 - Data CPLB Miss */
        .long _ex_dmult         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
        .long _ex_trap_c        /* 0x28 - Emulation Watchpoint */
        .long _ex_trap_c        /* 0x29 - Instruction fetch access error (535 only) */
        .long _ex_trap_c        /* 0x2A - Instruction fetch misaligned */
        .long _ex_trap_c        /* 0x2B - Instruction CPLB protection Violation */
        .long _ex_icplb_miss    /* 0x2C - Instruction CPLB miss */
        .long _ex_trap_c        /* 0x2D - Instruction CPLB Multiple Hits */
        .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
        .long _ex_trap_c        /* 0x2E - Illegal use of Supervisor Resource */
        .long _ex_trap_c        /* 0x2F - Reserved */
        .long _ex_trap_c        /* 0x30 - Reserved */
        .long _ex_trap_c        /* 0x31 - Reserved */
        .long _ex_trap_c        /* 0x32 - Reserved */
        .long _ex_trap_c        /* 0x33 - Reserved */
        .long _ex_trap_c        /* 0x34 - Reserved */
        .long _ex_trap_c        /* 0x35 - Reserved */
        .long _ex_trap_c        /* 0x36 - Reserved */
        .long _ex_trap_c        /* 0x37 - Reserved */
        .long _ex_trap_c        /* 0x38 - Reserved */
        .long _ex_trap_c        /* 0x39 - Reserved */
        .long _ex_trap_c        /* 0x3A - Reserved */
        .long _ex_trap_c        /* 0x3B - Reserved */
        .long _ex_trap_c        /* 0x3C - Reserved */
        .long _ex_trap_c        /* 0x3D - Reserved */
        .long _ex_trap_c        /* 0x3E - Reserved */
        .long _ex_trap_c        /* 0x3F - Reserved */
END(_ex_table)

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_ni_syscall   /* old 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_chown        /* chown16 */
        .long _sys_ni_syscall   /* old break syscall holder */
        .long _sys_ni_syscall   /* old stat */
        .long _sys_lseek
        .long _sys_getpid       /* 20 */
        .long _sys_mount
        .long _sys_ni_syscall   /* old umount */
        .long _sys_setuid
        .long _sys_getuid
        .long _sys_stime                /* 25 */
        .long _sys_ptrace
        .long _sys_alarm
        .long _sys_ni_syscall   /* old fstat */
        .long _sys_pause
        .long _sys_ni_syscall   /* old 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_setgid
        .long _sys_getgid
        .long _sys_ni_syscall   /* old sys_signal */
        .long _sys_geteuid      /* geteuid16 */
        .long _sys_getegid      /* 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 old uname */
        .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_ni_syscall   /* old sys_sigaction */
        .long _sys_sgetmask
        .long _sys_ssetmask
        .long _sys_setreuid     /* setreuid16 */        /* 70 */
        .long _sys_setregid     /* setregid16 */
        .long _sys_ni_syscall   /* old sys_sigsuspend */
        .long _sys_ni_syscall   /* old sys_sigpending */
        .long _sys_sethostname
        .long _sys_setrlimit    /* 75 */
        .long _sys_ni_syscall   /* old getrlimit */
        .long _sys_getrusage
        .long _sys_gettimeofday
        .long _sys_settimeofday
        .long _sys_getgroups    /* getgroups16 */       /* 80 */
        .long _sys_setgroups    /* setgroups16 */
        .long _sys_ni_syscall   /* old_select */
        .long _sys_symlink
        .long _sys_ni_syscall   /* old lstat */
        .long _sys_readlink     /* 85 */
        .long _sys_uselib
        .long _sys_ni_syscall   /* sys_swapon */
        .long _sys_reboot
        .long _sys_ni_syscall   /* old_readdir */
        .long _sys_ni_syscall   /* sys_mmap */  /* 90 */
        .long _sys_munmap
        .long _sys_truncate
        .long _sys_ftruncate
        .long _sys_fchmod
        .long _sys_fchown       /* 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
        .long _sys_ni_syscall   /* old 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 uname */
        .long _sys_ni_syscall   /* iopl for i386 */ /* 110 */
        .long _sys_vhangup
        .long _sys_ni_syscall   /* obsolete idle() syscall */
        .long _sys_ni_syscall   /* vm86old for i386 */
        .long _sys_wait4
        .long _sys_ni_syscall   /* 115 */ /* sys_swapoff */
        .long _sys_sysinfo
        .long _sys_ni_syscall   /* old sys_ipc */
        .long _sys_fsync
        .long _sys_ni_syscall   /* old sys_sigreturn */
        .long _sys_clone                /* 120 */
        .long _sys_setdomainname
        .long _sys_newuname
        .long _sys_ni_syscall   /* old sys_modify_ldt */
        .long _sys_adjtimex
        .long _sys_mprotect     /* 125 */
        .long _sys_ni_syscall   /* old sys_sigprocmask */
        .long _sys_ni_syscall   /* old "creat_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_ni_syscall   /* 135 */ /* sys_sysfs */
        .long _sys_personality
        .long _sys_ni_syscall   /* for afs_syscall */
        .long _sys_setfsuid     /* setfsuid16 */
        .long _sys_setfsgid     /* setfsgid16 */
        .long _sys_llseek       /* 140 */
        .long _sys_getdents
        .long _sys_ni_syscall   /* 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_setresuid    /* setresuid16 */
        .long _sys_getresuid    /* getresuid16 */       /* 165 */
        .long _sys_ni_syscall   /* for vm86 */
        .long _sys_ni_syscall   /* old "query_module" */
        .long _sys_ni_syscall   /* sys_poll */
        .long _sys_nfsservctl
        .long _sys_setresgid    /* setresgid16 */       /* 170 */
        .long _sys_getresgid    /* 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_lchown       /* 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_mmap_pgoff
        .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_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_ni_syscall   /* 250 */ /* sys_alloc_hugepages */
        .long _sys_ni_syscall   /* sys_freec_hugepages */
        .long _sys_exit_group
        .long _sys_lookup_dcookie
        .long _sys_bfin_spinlock
        .long _sys_epoll_create /* 255 */
        .long _sys_epoll_ctl
        .long _sys_epoll_wait
        .long _sys_ni_syscall /* remap_file_pages */
        .long _sys_set_tid_address
        .long _sys_timer_create /* 260 */
        .long _sys_timer_settime
        .long _sys_timer_gettime
        .long _sys_timer_getoverrun
        .long _sys_timer_delete
        .long _sys_clock_settime /* 265 */
        .long _sys_clock_gettime
        .long _sys_clock_getres
        .long _sys_clock_nanosleep
        .long _sys_statfs64
        .long _sys_fstatfs64    /* 270 */
        .long _sys_tgkill
        .long _sys_utimes
        .long _sys_fadvise64_64
        .long _sys_ni_syscall /* vserver */
        .long _sys_mbind        /* 275 */
        .long _sys_ni_syscall /* get_mempolicy */
        .long _sys_ni_syscall /* set_mempolicy */
        .long _sys_mq_open
        .long _sys_mq_unlink
        .long _sys_mq_timedsend /* 280 */
        .long _sys_mq_timedreceive
        .long _sys_mq_notify
        .long _sys_mq_getsetattr
        .long _sys_ni_syscall /* kexec_load */
        .long _sys_waitid       /* 285 */
        .long _sys_add_key
        .long _sys_request_key
        .long _sys_keyctl
        .long _sys_ioprio_set
        .long _sys_ioprio_get   /* 290 */
        .long _sys_inotify_init
        .long _sys_inotify_add_watch
        .long _sys_inotify_rm_watch
        .long _sys_ni_syscall /* migrate_pages */
        .long _sys_openat       /* 295 */
        .long _sys_mkdirat
        .long _sys_mknodat
        .long _sys_fchownat
        .long _sys_futimesat
        .long _sys_fstatat64    /* 300 */
        .long _sys_unlinkat
        .long _sys_renameat
        .long _sys_linkat
        .long _sys_symlinkat
        .long _sys_readlinkat   /* 305 */
        .long _sys_fchmodat
        .long _sys_faccessat
        .long _sys_pselect6
        .long _sys_ppoll
        .long _sys_unshare      /* 310 */
        .long _sys_sram_alloc
        .long _sys_sram_free
        .long _sys_dma_memcpy
        .long _sys_accept
        .long _sys_bind         /* 315 */
        .long _sys_connect
        .long _sys_getpeername
        .long _sys_getsockname
        .long _sys_getsockopt
        .long _sys_listen       /* 320 */
        .long _sys_recv
        .long _sys_recvfrom
        .long _sys_recvmsg
        .long _sys_send
        .long _sys_sendmsg      /* 325 */
        .long _sys_sendto
        .long _sys_setsockopt
        .long _sys_shutdown
        .long _sys_socket
        .long _sys_socketpair   /* 330 */
        .long _sys_semctl
        .long _sys_semget
        .long _sys_semop
        .long _sys_msgctl
        .long _sys_msgget       /* 335 */
        .long _sys_msgrcv
        .long _sys_msgsnd
        .long _sys_shmat
        .long _sys_shmctl
        .long _sys_shmdt        /* 340 */
        .long _sys_shmget
        .long _sys_splice
        .long _sys_sync_file_range
        .long _sys_tee
        .long _sys_vmsplice     /* 345 */
        .long _sys_epoll_pwait
        .long _sys_utimensat
        .long _sys_signalfd
        .long _sys_timerfd_create
        .long _sys_eventfd      /* 350 */
        .long _sys_pread64
        .long _sys_pwrite64
        .long _sys_fadvise64
        .long _sys_set_robust_list
        .long _sys_get_robust_list      /* 355 */
        .long _sys_fallocate
        .long _sys_semtimedop
        .long _sys_timerfd_settime
        .long _sys_timerfd_gettime
        .long _sys_signalfd4            /* 360 */
        .long _sys_eventfd2
        .long _sys_epoll_create1
        .long _sys_dup3
        .long _sys_pipe2
        .long _sys_inotify_init1        /* 365 */
        .long _sys_preadv
        .long _sys_pwritev
        .long _sys_rt_tgsigqueueinfo
        .long _sys_perf_event_open
        .long _sys_recvmmsg             /* 370 */
        .long _sys_fanotify_init
        .long _sys_fanotify_mark
        .long _sys_prlimit64
        .long _sys_cacheflush
        .long _sys_name_to_handle_at    /* 375 */
        .long _sys_open_by_handle_at
        .long _sys_clock_adjtime
        .long _sys_syncfs
        .long _sys_setns
        .long _sys_sendmmsg             /* 380 */

        .rept NR_syscalls-(.-_sys_call_table)/4
        .long _sys_ni_syscall
        .endr
END(_sys_call_table)