C++ BUG函数代码示例

/*
 * This routine handles page faults.  It determines the address,
 * and the problem, and then passes it off to one of the appropriate
 * routines.
 */
asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
				unsigned long address)
{
	struct vm_area_struct *vma = NULL;
	struct task_struct *tsk = current;
	struct mm_struct *mm = tsk->mm;
	const int field = sizeof(unsigned long) * 2;
	unsigned long flags = 0;
	siginfo_t info;
	int fault;

	info.si_code = SEGV_MAPERR;

	/*
	* We fault-in kernel-space virtual memory on-demand. The
	* 'reference' page table is init_mm.pgd.
	*
	* NOTE! We MUST NOT take any locks for this case. We may
	* be in an interrupt or a critical region, and should
	* only copy the information from the master page table,
	* nothing more.
	*/
	if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END))
		goto vmalloc_fault;
#ifdef MODULE_START
	if (unlikely(address >= MODULE_START && address < MODULE_END))
		goto vmalloc_fault;
#endif

	/*
	* If we're in an interrupt or have no user
	* context, we must not take the fault..
	*/
	if (in_atomic() || !mm)
		goto bad_area_nosemaphore;

	if (user_mode(regs))
		flags |= FAULT_FLAG_USER;

	down_read(&mm->mmap_sem);
	vma = find_vma(mm, address);
	if (!vma)
		goto bad_area;
	if (vma->vm_start <= address)
		goto good_area;
	if (!(vma->vm_flags & VM_GROWSDOWN))
		goto bad_area;
	if (expand_stack(vma, address))
		goto bad_area;
	/*
	* Ok, we have a good vm_area for this memory access, so
	* we can handle it..
	 */
good_area:
	info.si_code = SEGV_ACCERR;

	if (write) {
		if (!(vma->vm_flags & VM_WRITE))
			goto bad_area;
		flags |= FAULT_FLAG_WRITE;
	} else {
		if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
			goto bad_area;
	}

survive:
	/*
	* If for any reason at all we couldn't handle the fault,
	* make sure we exit gracefully rather than endlessly redo
	* the fault.
	*/
	fault = handle_mm_fault(mm, vma, address, flags);
	if (unlikely(fault & VM_FAULT_ERROR)) {
		if (fault & VM_FAULT_OOM)
			goto out_of_memory;
		else if (fault & VM_FAULT_SIGBUS)
			goto do_sigbus;
		BUG();
	}
	if (fault & VM_FAULT_MAJOR)
		tsk->maj_flt++;
	else
		tsk->min_flt++;

	up_read(&mm->mmap_sem);
	return;

	/*
	* Something tried to access memory that isn't in our memory map..
	* Fix it, but check if it's kernel or user first..
	 */
bad_area:
	up_read(&mm->mmap_sem);

bad_area_nosemaphore:
//.........这里部分代码省略.........

void __devinit setup_local_APIC(void)
{
    unsigned long oldvalue, value, ver, maxlvt;
    int i, j;

    /* Pound the ESR really hard over the head with a big hammer - mbligh */
    if (esr_disable) {
        apic_write(APIC_ESR, 0);
        apic_write(APIC_ESR, 0);
        apic_write(APIC_ESR, 0);
        apic_write(APIC_ESR, 0);
    }

    value = apic_read(APIC_LVR);
    ver = GET_APIC_VERSION(value);

    BUILD_BUG_ON((SPURIOUS_APIC_VECTOR & 0x0f) != 0x0f);

    /*
     * Double-check whether this APIC is really registered.
     */
    if (!apic_id_registered())
        BUG();

    /*
     * Intel recommends to set DFR, LDR and TPR before enabling
     * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
     * document number 292116).  So here it goes...
     */
    init_apic_ldr();

    /*
     * Set Task Priority to reject any interrupts below FIRST_DYNAMIC_VECTOR.
     */
    apic_write_around(APIC_TASKPRI, (FIRST_DYNAMIC_VECTOR & 0xF0) - 0x10);

    /*
     * After a crash, we no longer service the interrupts and a pending
     * interrupt from previous kernel might still have ISR bit set.
     *
     * Most probably by now CPU has serviced that pending interrupt and
     * it might not have done the ack_APIC_irq() because it thought,
     * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it
     * does not clear the ISR bit and cpu thinks it has already serivced
     * the interrupt. Hence a vector might get locked. It was noticed
     * for timer irq (vector 0x31). Issue an extra EOI to clear ISR.
     */
    for (i = APIC_ISR_NR - 1; i >= 0; i--) {
        value = apic_read(APIC_ISR + i*0x10);
        for (j = 31; j >= 0; j--) {
            if (value & (1<<j))
                ack_APIC_irq();
        }
    }

    /*
     * Now that we are all set up, enable the APIC
     */
    value = apic_read(APIC_SPIV);
    value &= ~APIC_VECTOR_MASK;
    /*
     * Enable APIC
     */
    value |= APIC_SPIV_APIC_ENABLED;

    /*
     * Some unknown Intel IO/APIC (or APIC) errata is biting us with
     * certain networking cards. If high frequency interrupts are
     * happening on a particular IOAPIC pin, plus the IOAPIC routing
     * entry is masked/unmasked at a high rate as well then sooner or
     * later IOAPIC line gets 'stuck', no more interrupts are received
     * from the device. If focus CPU is disabled then the hang goes
     * away, oh well :-(
     *
     * [ This bug can be reproduced easily with a level-triggered
     *   PCI Ne2000 networking cards and PII/PIII processors, dual
     *   BX chipset. ]
     */
    /*
     * Actually disabling the focus CPU check just makes the hang less
     * frequent as it makes the interrupt distributon model be more
     * like LRU than MRU (the short-term load is more even across CPUs).
     * See also the comment in end_level_ioapic_irq().  --macro
     */
#if 1
    /* Enable focus processor (bit==0) */
    value &= ~APIC_SPIV_FOCUS_DISABLED;
#else
    /* Disable focus processor (bit==1) */
    value |= APIC_SPIV_FOCUS_DISABLED;
#endif
    /*
     * Set spurious IRQ vector
     */
    value |= SPURIOUS_APIC_VECTOR;

    /*
     * Enable directed EOI
     */
    if ( directed_eoi_enabled )
//.........这里部分代码省略.........

static inline void play_dead(void)
{
	BUG();
}

static int
do_check( PKT_secret_key *sk, const char *tryagain_text, int mode,
          int *canceled )
{
    gpg_error_t err;
    u16 csum=0;
    int i, res;
    size_t nbytes;

    if( sk->is_protected ) { /* remove the protection */
	DEK *dek = NULL;
	u32 keyid[4]; /* 4! because we need two of them */
	gcry_cipher_hd_t cipher_hd=NULL;
	PKT_secret_key *save_sk;

	if( sk->protect.s2k.mode == 1001 ) {
	    log_info(_("secret key parts are not available\n"));
	    return G10ERR_UNU_SECKEY;
	}
	if( sk->protect.algo == CIPHER_ALGO_NONE )
	    BUG();
	if( openpgp_cipher_test_algo( sk->protect.algo ) ) {
	    log_info(_("protection algorithm %d%s is not supported\n"),
			sk->protect.algo,sk->protect.algo==1?" (IDEA)":"" );
	    if (sk->protect.algo==CIPHER_ALGO_IDEA)
              {
                write_status (STATUS_RSA_OR_IDEA);
                idea_cipher_warn (0);
              }
	    return G10ERR_CIPHER_ALGO;
	}
	if(gcry_md_test_algo (sk->protect.s2k.hash_algo))
	  {
	    log_info(_("protection digest %d is not supported\n"),
		     sk->protect.s2k.hash_algo);
	    return G10ERR_DIGEST_ALGO;
	  }
	keyid_from_sk( sk, keyid );
	keyid[2] = keyid[3] = 0;
	if( !sk->is_primary ) {
            keyid[2] = sk->main_keyid[0];
            keyid[3] = sk->main_keyid[1];
	}
	dek = passphrase_to_dek( keyid, sk->pubkey_algo, sk->protect.algo,
				 &sk->protect.s2k, mode,
                                 tryagain_text, canceled );
        if (!dek && canceled && *canceled)
	    return GPG_ERR_CANCELED;


	err = openpgp_cipher_open (&cipher_hd, sk->protect.algo,
				   GCRY_CIPHER_MODE_CFB,
				   (GCRY_CIPHER_SECURE
				    | (sk->protect.algo >= 100 ?
				       0 : GCRY_CIPHER_ENABLE_SYNC)));
        if (err)
          log_fatal ("cipher open failed: %s\n", gpg_strerror (err) );

	err = gcry_cipher_setkey (cipher_hd, dek->key, dek->keylen);
        if (err)
          log_fatal ("set key failed: %s\n", gpg_strerror (err) );

	xfree(dek);
	save_sk = copy_secret_key( NULL, sk );

	gcry_cipher_setiv ( cipher_hd, sk->protect.iv, sk->protect.ivlen );

	csum = 0;
	if( sk->version >= 4 ) {
            int ndata;
	    unsigned int ndatabits;
	    byte *p, *data;
            u16 csumc = 0;

	    i = pubkey_get_npkey(sk->pubkey_algo);

            assert ( gcry_mpi_get_flag (sk->skey[i], GCRYMPI_FLAG_OPAQUE ));
            p = gcry_mpi_get_opaque ( sk->skey[i], &ndatabits );
            ndata = (ndatabits+7)/8;

            if ( ndata > 1 && p )
                csumc = p[ndata-2] << 8 | p[ndata-1];
	    data = xmalloc_secure ( ndata );
            if (p)
              gcry_cipher_decrypt ( cipher_hd, data, ndata, p, ndata );
            else
              memset (data, 0, ndata);
	    gcry_mpi_release (sk->skey[i]); sk->skey[i] = NULL ;

	    p = data;
            if (sk->protect.sha1chk) {
                /* This is the new SHA1 checksum method to detect
                   tampering with the key as used by the Klima/Rosa
                   attack */
                sk->csum = 0;
                csum = 1;
                if( ndata < 20 )
                    log_error("not enough bytes for SHA-1 checksum\n");
                else {
                    gcry_md_hd_t h;
//.........这里部分代码省略.........

/**
 * write_mft_record_nolock - write out a mapped (extent) mft record
 * @ni:		ntfs inode describing the mapped (extent) mft record
 * @m:		mapped (extent) mft record to write
 * @sync:	if true, wait for i/o completion
 *
 * Write the mapped (extent) mft record @m described by the (regular or extent)
 * ntfs inode @ni to backing store.  If the mft record @m has a counterpart in
 * the mft mirror, that is also updated.
 *
 * On success, clean the mft record and return 0.  On error, leave the mft
 * record dirty and return -errno.  The caller should call make_bad_inode() on
 * the base inode to ensure no more access happens to this inode.  We do not do
 * it here as the caller may want to finish writing other extent mft records
 * first to minimize on-disk metadata inconsistencies.
 *
 * NOTE:  We always perform synchronous i/o and ignore the @sync parameter.
 * However, if the mft record has a counterpart in the mft mirror and @sync is
 * true, we write the mft record, wait for i/o completion, and only then write
 * the mft mirror copy.  This ensures that if the system crashes either the mft
 * or the mft mirror will contain a self-consistent mft record @m.  If @sync is
 * false on the other hand, we start i/o on both and then wait for completion
 * on them.  This provides a speedup but no longer guarantees that you will end
 * up with a self-consistent mft record in the case of a crash but if you asked
 * for asynchronous writing you probably do not care about that anyway.
 *
 * TODO:  If @sync is false, want to do truly asynchronous i/o, i.e. just
 * schedule i/o via ->writepage or do it via kntfsd or whatever.
 */
int write_mft_record_nolock(ntfs_inode *ni, MFT_RECORD *m, int sync)
{
	ntfs_volume *vol = ni->vol;
	struct page *page = ni->page;
	unsigned int blocksize = vol->sb->s_blocksize;
	int max_bhs = vol->mft_record_size / blocksize;
	struct buffer_head *bhs[max_bhs];
	struct buffer_head *bh, *head;
	unsigned int block_start, block_end, m_start, m_end;
	int i_bhs, nr_bhs, err = 0;

	ntfs_debug("Entering for inode 0x%lx.", ni->mft_no);
	BUG_ON(NInoAttr(ni));
	BUG_ON(!max_bhs);
	BUG_ON(!PageLocked(page));
	/*
	 * If the ntfs_inode is clean no need to do anything.  If it is dirty,
	 * mark it as clean now so that it can be redirtied later on if needed.
	 * There is no danger of races since the caller is holding the locks
	 * for the mft record @m and the page it is in.
	 */
	if (!NInoTestClearDirty(ni))
		goto done;
	/* Make sure we have mapped buffers. */
	if (!page_has_buffers(page)) {
no_buffers_err_out:
		ntfs_error(vol->sb, "Writing mft records without existing "
				"buffers is not implemented yet.  %s",
				ntfs_please_email);
		err = -EOPNOTSUPP;
		goto err_out;
	}
	bh = head = page_buffers(page);
	if (!bh)
		goto no_buffers_err_out;
	nr_bhs = 0;
	block_start = 0;
	m_start = ni->page_ofs;
	m_end = m_start + vol->mft_record_size;
	do {
		block_end = block_start + blocksize;
		/*
		 * If the buffer is outside the mft record, just skip it,
		 * clearing it if it is dirty to make sure it is not written
		 * out.  It should never be marked dirty but better be safe.
		 */
		if ((block_end <= m_start) || (block_start >= m_end)) {
			if (buffer_dirty(bh)) {
				ntfs_warning(vol->sb, "Clearing dirty mft "
						"record page buffer.  %s",
						ntfs_please_email);
				clear_buffer_dirty(bh);
			}
			continue;
		}
		if (!buffer_mapped(bh)) {
			ntfs_error(vol->sb, "Writing mft records without "
					"existing mapped buffers is not "
					"implemented yet.  %s",
					ntfs_please_email);
			err = -EOPNOTSUPP;
			continue;
		}
		if (!buffer_uptodate(bh)) {
			ntfs_error(vol->sb, "Writing mft records without "
					"existing uptodate buffers is not "
					"implemented yet.  %s",
					ntfs_please_email);
			err = -EOPNOTSUPP;
			continue;
		}
//.........这里部分代码省略.........

/*
 * receive a message from an RxRPC socket
 * - we need to be careful about two or more threads calling recvmsg
 *   simultaneously
 */
int rxrpc_recvmsg(struct kiocb *iocb, struct socket *sock,
		  struct msghdr *msg, size_t len, int flags)
{
	struct rxrpc_skb_priv *sp;
	struct rxrpc_call *call = NULL, *continue_call = NULL;
	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
	struct sk_buff *skb;
	long timeo;
	int copy, ret, ullen, offset, copied = 0;
	u32 abort_code;

	DEFINE_WAIT(wait);

	_enter(",,,%zu,%d", len, flags);

	if (flags & (MSG_OOB | MSG_TRUNC))
		return -EOPNOTSUPP;

	ullen = msg->msg_flags & MSG_CMSG_COMPAT ? 4 : sizeof(unsigned long);

	timeo = sock_rcvtimeo(&rx->sk, flags & MSG_DONTWAIT);
	msg->msg_flags |= MSG_MORE;

	lock_sock(&rx->sk);

	for (;;) {
		/* return immediately if a client socket has no outstanding
		 * calls */
		if (RB_EMPTY_ROOT(&rx->calls)) {
			if (copied)
				goto out;
			if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) {
				release_sock(&rx->sk);
				if (continue_call)
					rxrpc_put_call(continue_call);
				return -ENODATA;
			}
		}

		/* get the next message on the Rx queue */
		skb = skb_peek(&rx->sk.sk_receive_queue);
		if (!skb) {
			/* nothing remains on the queue */
			if (copied &&
			    (msg->msg_flags & MSG_PEEK || timeo == 0))
				goto out;

			/* wait for a message to turn up */
			release_sock(&rx->sk);
			prepare_to_wait_exclusive(sk_sleep(&rx->sk), &wait,
						  TASK_INTERRUPTIBLE);
			ret = sock_error(&rx->sk);
			if (ret)
				goto wait_error;

			if (skb_queue_empty(&rx->sk.sk_receive_queue)) {
				if (signal_pending(current))
					goto wait_interrupted;
				timeo = schedule_timeout(timeo);
			}
			finish_wait(sk_sleep(&rx->sk), &wait);
			lock_sock(&rx->sk);
			continue;
		}

	peek_next_packet:
		sp = rxrpc_skb(skb);
		call = sp->call;
		ASSERT(call != NULL);

		_debug("next pkt %s", rxrpc_pkts[sp->hdr.type]);

		/* make sure we wait for the state to be updated in this call */
		spin_lock_bh(&call->lock);
		spin_unlock_bh(&call->lock);

		if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) {
			_debug("packet from released call");
			if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
				BUG();
			rxrpc_free_skb(skb);
			continue;
		}

		/* determine whether to continue last data receive */
		if (continue_call) {
			_debug("maybe cont");
			if (call != continue_call ||
			    skb->mark != RXRPC_SKB_MARK_DATA) {
				release_sock(&rx->sk);
				rxrpc_put_call(continue_call);
				_leave(" = %d [noncont]", copied);
				return copied;
			}
		}
//.........这里部分代码省略.........

static void bcm63xx_init_irq(void)
{
	int irq_bits;

	irq_stat_addr[0] = bcm63xx_regset_address(RSET_PERF);
	irq_mask_addr[0] = bcm63xx_regset_address(RSET_PERF);
	irq_stat_addr[1] = bcm63xx_regset_address(RSET_PERF);
	irq_mask_addr[1] = bcm63xx_regset_address(RSET_PERF);

	switch (bcm63xx_get_cpu_id()) {
	case BCM3368_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_3368_REG;
		irq_mask_addr[0] += PERF_IRQMASK_3368_REG;
		irq_stat_addr[1] = 0;
		irq_mask_addr[1] = 0;
		irq_bits = 32;
		ext_irq_count = 4;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_3368;
		break;
	case BCM6328_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_6328_REG(0);
		irq_mask_addr[0] += PERF_IRQMASK_6328_REG(0);
		irq_stat_addr[1] += PERF_IRQSTAT_6328_REG(1);
		irq_mask_addr[1] += PERF_IRQMASK_6328_REG(1);
		irq_bits = 64;
		ext_irq_count = 4;
		is_ext_irq_cascaded = 1;
		ext_irq_start = BCM_6328_EXT_IRQ0 - IRQ_INTERNAL_BASE;
		ext_irq_end = BCM_6328_EXT_IRQ3 - IRQ_INTERNAL_BASE;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6328;
		break;
	case BCM6338_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_6338_REG;
		irq_mask_addr[0] += PERF_IRQMASK_6338_REG;
		irq_stat_addr[1] = 0;
		irq_mask_addr[1] = 0;
		irq_bits = 32;
		ext_irq_count = 4;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6338;
		break;
	case BCM6345_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_6345_REG;
		irq_mask_addr[0] += PERF_IRQMASK_6345_REG;
		irq_stat_addr[1] = 0;
		irq_mask_addr[1] = 0;
		irq_bits = 32;
		ext_irq_count = 4;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6345;
		break;
	case BCM6348_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_6348_REG;
		irq_mask_addr[0] += PERF_IRQMASK_6348_REG;
		irq_stat_addr[1] = 0;
		irq_mask_addr[1] = 0;
		irq_bits = 32;
		ext_irq_count = 4;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6348;
		break;
	case BCM6358_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_6358_REG(0);
		irq_mask_addr[0] += PERF_IRQMASK_6358_REG(0);
		irq_stat_addr[1] += PERF_IRQSTAT_6358_REG(1);
		irq_mask_addr[1] += PERF_IRQMASK_6358_REG(1);
		irq_bits = 32;
		ext_irq_count = 4;
		is_ext_irq_cascaded = 1;
		ext_irq_start = BCM_6358_EXT_IRQ0 - IRQ_INTERNAL_BASE;
		ext_irq_end = BCM_6358_EXT_IRQ3 - IRQ_INTERNAL_BASE;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6358;
		break;
	case BCM6362_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_6362_REG(0);
		irq_mask_addr[0] += PERF_IRQMASK_6362_REG(0);
		irq_stat_addr[1] += PERF_IRQSTAT_6362_REG(1);
		irq_mask_addr[1] += PERF_IRQMASK_6362_REG(1);
		irq_bits = 64;
		ext_irq_count = 4;
		is_ext_irq_cascaded = 1;
		ext_irq_start = BCM_6362_EXT_IRQ0 - IRQ_INTERNAL_BASE;
		ext_irq_end = BCM_6362_EXT_IRQ3 - IRQ_INTERNAL_BASE;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6362;
		break;
	case BCM6368_CPU_ID:
		irq_stat_addr[0] += PERF_IRQSTAT_6368_REG(0);
		irq_mask_addr[0] += PERF_IRQMASK_6368_REG(0);
		irq_stat_addr[1] += PERF_IRQSTAT_6368_REG(1);
		irq_mask_addr[1] += PERF_IRQMASK_6368_REG(1);
		irq_bits = 64;
		ext_irq_count = 6;
		is_ext_irq_cascaded = 1;
		ext_irq_start = BCM_6368_EXT_IRQ0 - IRQ_INTERNAL_BASE;
		ext_irq_end = BCM_6368_EXT_IRQ5 - IRQ_INTERNAL_BASE;
		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6368;
		ext_irq_cfg_reg2 = PERF_EXTIRQ_CFG_REG2_6368;
		break;
	default:
		BUG();
	}

	if (irq_bits == 32) {
//.........这里部分代码省略.........

/*
 * Called with IRQs disabled. IRQs must remain disabled from that point
 * all the way until processing this kprobe is complete.  The current
 * kprobes implementation cannot process more than one nested level of
 * kprobe, and that level is reserved for user kprobe handlers, so we can't
 * risk encountering a new kprobe in an interrupt handler.
 */
void __kprobes kprobe_handler(struct pt_regs *regs)
{
	struct kprobe *p, *cur;
	struct kprobe_ctlblk *kcb;

	kcb = get_kprobe_ctlblk();
	cur = kprobe_running();

#ifdef CONFIG_THUMB2_KERNEL
	/*
	 * First look for a probe which was registered using an address with
	 * bit 0 set, this is the usual situation for pointers to Thumb code.
	 * If not found, fallback to looking for one with bit 0 clear.
	 */
	p = get_kprobe((kprobe_opcode_t *)(regs->ARM_pc | 1));
	if (!p)
		p = get_kprobe((kprobe_opcode_t *)regs->ARM_pc);

#else /* ! CONFIG_THUMB2_KERNEL */
	p = get_kprobe((kprobe_opcode_t *)regs->ARM_pc);
#endif

	if (p) {
		if (cur) {
			/* Kprobe is pending, so we're recursing. */
			switch (kcb->kprobe_status) {
			case KPROBE_HIT_ACTIVE:
			case KPROBE_HIT_SSDONE:
				/* A pre- or post-handler probe got us here. */
				kprobes_inc_nmissed_count(p);
				save_previous_kprobe(kcb);
				set_current_kprobe(p);
				kcb->kprobe_status = KPROBE_REENTER;
				singlestep(p, regs, kcb);
				restore_previous_kprobe(kcb);
				break;
			default:
				/* impossible cases */
				BUG();
			}
		} else if (p->ainsn.insn_check_cc(regs->ARM_cpsr)) {
			/* Probe hit and conditional execution check ok. */
			set_current_kprobe(p);
			kcb->kprobe_status = KPROBE_HIT_ACTIVE;

			/*
			 * If we have no pre-handler or it returned 0, we
			 * continue with normal processing.  If we have a
			 * pre-handler and it returned non-zero, it prepped
			 * for calling the break_handler below on re-entry,
			 * so get out doing nothing more here.
			 */
			if (!p->pre_handler || !p->pre_handler(p, regs)) {
				kcb->kprobe_status = KPROBE_HIT_SS;
				singlestep(p, regs, kcb);
				if (p->post_handler) {
					kcb->kprobe_status = KPROBE_HIT_SSDONE;
					p->post_handler(p, regs, 0);
				}
				reset_current_kprobe();
			}
		} else {
			/*
			 * Probe hit but conditional execution check failed,
			 * so just skip the instruction and continue as if
			 * nothing had happened.
			 */
			singlestep_skip(p, regs);
		}
	} else if (cur) {
		/* We probably hit a jprobe.  Call its break handler. */
		if (cur->break_handler && cur->break_handler(cur, regs)) {
			kcb->kprobe_status = KPROBE_HIT_SS;
			singlestep(cur, regs, kcb);
			if (cur->post_handler) {
				kcb->kprobe_status = KPROBE_HIT_SSDONE;
				cur->post_handler(cur, regs, 0);
			}
		}
		reset_current_kprobe();
	} else {
		/*
		 * The probe was removed and a race is in progress.
		 * There is nothing we can do about it.  Let's restart
		 * the instruction.  By the time we can restart, the
		 * real instruction will be there.
		 */
	}
}

//.........这里部分代码省略.........
	return &vmw_tt->vsgt;
}


static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
{
	struct vmw_ttm_tt *vmw_be =
		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
	int ret;

	ret = vmw_ttm_map_dma(vmw_be);
	if (unlikely(ret != 0))
		return ret;

	vmw_be->gmr_id = bo_mem->start;
	vmw_be->mem_type = bo_mem->mem_type;

	switch (bo_mem->mem_type) {
	case VMW_PL_GMR:
		return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
				    ttm->num_pages, vmw_be->gmr_id);
	case VMW_PL_MOB:
		if (unlikely(vmw_be->mob == NULL)) {
			vmw_be->mob =
				vmw_mob_create(ttm->num_pages);
			if (unlikely(vmw_be->mob == NULL))
				return -ENOMEM;
		}

		return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
				    &vmw_be->vsgt, ttm->num_pages,
				    vmw_be->gmr_id);
	default:
		BUG();
	}
	return 0;
}

static int vmw_ttm_unbind(struct ttm_tt *ttm)
{
	struct vmw_ttm_tt *vmw_be =
		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);

	switch (vmw_be->mem_type) {
	case VMW_PL_GMR:
		vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
		break;
	case VMW_PL_MOB:
		vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
		break;
	default:
		BUG();
	}

	if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
		vmw_ttm_unmap_dma(vmw_be);

	return 0;
}


static void vmw_ttm_destroy(struct ttm_tt *ttm)
{
	struct vmw_ttm_tt *vmw_be =
		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);

//.........这里部分代码省略.........
				goto nla_put_failure;
		} else {
			/* Case 2: indev is a bridge group, we need to look
			 * for physical device (when called from ipv4) */
			if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
					 htonl(outdev->ifindex)))
				goto nla_put_failure;
			if (skb->nf_bridge && skb->nf_bridge->physoutdev &&
			    nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
					 htonl(skb->nf_bridge->physoutdev->ifindex)))
				goto nla_put_failure;
		}
#endif
	}

	if (skb->mark &&
	    nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
		goto nla_put_failure;

	if (indev && skb->dev &&
	    skb->mac_header != skb->network_header) {
		struct nfulnl_msg_packet_hw phw;
		int len = dev_parse_header(skb, phw.hw_addr);
		if (len > 0) {
			phw.hw_addrlen = htons(len);
			if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
				goto nla_put_failure;
		}
	}

	if (indev && skb_mac_header_was_set(skb)) {
		if (nla_put_be32(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
		    nla_put_be16(inst->skb, NFULA_HWLEN,
				 htons(skb->dev->hard_header_len)) ||
		    nla_put(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len,
			    skb_mac_header(skb)))
			goto nla_put_failure;
	}

	if (skb->tstamp.tv64) {
		struct nfulnl_msg_packet_timestamp ts;
		struct timeval tv = ktime_to_timeval(skb->tstamp);
		ts.sec = cpu_to_be64(tv.tv_sec);
		ts.usec = cpu_to_be64(tv.tv_usec);

		if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
			goto nla_put_failure;
	}

	/* UID */
	if (skb->sk) {
		read_lock_bh(&skb->sk->sk_callback_lock);
		if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
			struct file *file = skb->sk->sk_socket->file;
			__be32 uid = htonl(file->f_cred->fsuid);
			__be32 gid = htonl(file->f_cred->fsgid);
			read_unlock_bh(&skb->sk->sk_callback_lock);
			if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
			    nla_put_be32(inst->skb, NFULA_GID, gid))
				goto nla_put_failure;
		} else
			read_unlock_bh(&skb->sk->sk_callback_lock);
	}

	/* local sequence number */
	if ((inst->flags & NFULNL_CFG_F_SEQ) &&
	    nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
		goto nla_put_failure;

	/* global sequence number */
	if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
	    nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
			 htonl(atomic_inc_return(&global_seq))))
		goto nla_put_failure;

	if (data_len) {
		struct nlattr *nla;
		int size = nla_attr_size(data_len);

		if (skb_tailroom(inst->skb) < nla_total_size(data_len)) {
			printk(KERN_WARNING "nfnetlink_log: no tailroom!\n");
			goto nlmsg_failure;
		}

		nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len));
		nla->nla_type = NFULA_PAYLOAD;
		nla->nla_len = size;

		if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
			BUG();
	}

	nlh->nlmsg_len = inst->skb->tail - old_tail;
	return 0;

nlmsg_failure:
nla_put_failure:
	PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
	return -1;
}

static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
{
	struct p9_flock flock;
	struct p9_fid *fid;
	uint8_t status;
	int res = 0;
	unsigned char fl_type;

	fid = filp->private_data;
	BUG_ON(fid == NULL);

	if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
		BUG();

	res = posix_lock_file_wait(filp, fl);
	if (res < 0)
		goto out;

	/* convert posix lock to p9 tlock args */
	memset(&flock, 0, sizeof(flock));
	/* map the lock type */
	switch (fl->fl_type) {
	case F_RDLCK:
		flock.type = P9_LOCK_TYPE_RDLCK;
		break;
	case F_WRLCK:
		flock.type = P9_LOCK_TYPE_WRLCK;
		break;
	case F_UNLCK:
		flock.type = P9_LOCK_TYPE_UNLCK;
		break;
	}
	flock.start = fl->fl_start;
	if (fl->fl_end == OFFSET_MAX)
		flock.length = 0;
	else
		flock.length = fl->fl_end - fl->fl_start + 1;
	flock.proc_id = fl->fl_pid;
	flock.client_id = fid->clnt->name;
	if (IS_SETLKW(cmd))
		flock.flags = P9_LOCK_FLAGS_BLOCK;

	/*
	 * if its a blocked request and we get P9_LOCK_BLOCKED as the status
	 * for lock request, keep on trying
	 */
	for (;;) {
		res = p9_client_lock_dotl(fid, &flock, &status);
		if (res < 0)
			break;

		if (status != P9_LOCK_BLOCKED)
			break;
		if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
			break;
		if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
			break;
	}

	/* map 9p status to VFS status */
	switch (status) {
	case P9_LOCK_SUCCESS:
		res = 0;
		break;
	case P9_LOCK_BLOCKED:
		res = -EAGAIN;
		break;
	case P9_LOCK_ERROR:
	case P9_LOCK_GRACE:
		res = -ENOLCK;
		break;
	default:
		BUG();
	}

	/*
	 * incase server returned error for lock request, revert
	 * it locally
	 */
	if (res < 0 && fl->fl_type != F_UNLCK) {
		fl_type = fl->fl_type;
		fl->fl_type = F_UNLCK;
		res = posix_lock_file_wait(filp, fl);
		fl->fl_type = fl_type;
	}
out:
	return res;
}

/** Initialize <b>crypto</b> from the key material in key_data.
 *
 * If <b>is_hs_v3</b> is set, this cpath will be used for next gen hidden
 * service circuits and <b>key_data</b> must be at least
 * HS_NTOR_KEY_EXPANSION_KDF_OUT_LEN bytes in length.
 *
 * If <b>is_hs_v3</b> is not set, key_data must contain CPATH_KEY_MATERIAL_LEN
 * bytes, which are used as follows:
 *   - 20 to initialize f_digest
 *   - 20 to initialize b_digest
 *   - 16 to key f_crypto
 *   - 16 to key b_crypto
 *
 * (If 'reverse' is true, then f_XX and b_XX are swapped.)
 *
 * Return 0 if init was successful, else -1 if it failed.
 */
int
relay_crypto_init(relay_crypto_t *crypto,
                  const char *key_data, size_t key_data_len,
                  int reverse, int is_hs_v3)
{
  crypto_digest_t *tmp_digest;
  crypto_cipher_t *tmp_crypto;
  size_t digest_len = 0;
  size_t cipher_key_len = 0;

  tor_assert(crypto);
  tor_assert(key_data);
  tor_assert(!(crypto->f_crypto || crypto->b_crypto ||
             crypto->f_digest || crypto->b_digest));

  /* Basic key size validation */
  if (is_hs_v3 && BUG(key_data_len != HS_NTOR_KEY_EXPANSION_KDF_OUT_LEN)) {
    goto err;
  } else if (!is_hs_v3 && BUG(key_data_len != CPATH_KEY_MATERIAL_LEN)) {
    goto err;
  }

  /* If we are using this crypto for next gen onion services use SHA3-256,
     otherwise use good ol' SHA1 */
  if (is_hs_v3) {
    digest_len = DIGEST256_LEN;
    cipher_key_len = CIPHER256_KEY_LEN;
    crypto->f_digest = crypto_digest256_new(DIGEST_SHA3_256);
    crypto->b_digest = crypto_digest256_new(DIGEST_SHA3_256);
  } else {
    digest_len = DIGEST_LEN;
    cipher_key_len = CIPHER_KEY_LEN;
    crypto->f_digest = crypto_digest_new();
    crypto->b_digest = crypto_digest_new();
  }

  tor_assert(digest_len != 0);
  tor_assert(cipher_key_len != 0);
  const int cipher_key_bits = (int) cipher_key_len * 8;

  crypto_digest_add_bytes(crypto->f_digest, key_data, digest_len);
  crypto_digest_add_bytes(crypto->b_digest, key_data+digest_len, digest_len);

  crypto->f_crypto = crypto_cipher_new_with_bits(key_data+(2*digest_len),
                                                cipher_key_bits);
  if (!crypto->f_crypto) {
    log_warn(LD_BUG,"Forward cipher initialization failed.");
    goto err;
  }

  crypto->b_crypto = crypto_cipher_new_with_bits(
                                        key_data+(2*digest_len)+cipher_key_len,
                                        cipher_key_bits);
  if (!crypto->b_crypto) {
    log_warn(LD_BUG,"Backward cipher initialization failed.");
    goto err;
  }

  if (reverse) {
    tmp_digest = crypto->f_digest;
    crypto->f_digest = crypto->b_digest;
    crypto->b_digest = tmp_digest;
    tmp_crypto = crypto->f_crypto;
    crypto->f_crypto = crypto->b_crypto;
    crypto->b_crypto = tmp_crypto;
  }

  return 0;
 err:
  relay_crypto_clear(crypto);
  return -1;
}

void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
    BUG();
}

void __init early_init_dt_scan_chosen_arch(unsigned long node)
{
    BUG();
}

static gpg_error_t
keyserver_get (ctrl_t ctrl, KEYDB_SEARCH_DESC *desc, int ndesc,
               struct keyserver_spec *keyserver)

{
  gpg_error_t err = 0;
  char **pattern;
  int idx, npat;
  estream_t datastream;

  /* Create an array filled with a search pattern for each key.  The
     array is delimited by a NULL entry.  */
  pattern = xtrycalloc (ndesc+1, sizeof *pattern);
  if (!pattern)
    return gpg_error_from_syserror ();
  for (npat=idx=0; idx < ndesc; idx++)
    {
      int quiet = 0;

      if (desc[idx].mode == KEYDB_SEARCH_MODE_FPR20
          || desc[idx].mode == KEYDB_SEARCH_MODE_FPR16)
        {
          pattern[npat] = xtrymalloc (2+2*20+1);
          if (!pattern[npat])
            err = gpg_error_from_syserror ();
          else
            {
              strcpy (pattern[npat], "0x");
              bin2hex (desc[idx].u.fpr,
                       desc[idx].mode == KEYDB_SEARCH_MODE_FPR20? 20 : 16,
                       pattern[npat]+2);
              npat++;
            }
        }
      else if(desc[idx].mode == KEYDB_SEARCH_MODE_LONG_KID)
        {
          pattern[npat] = xtryasprintf ("0x%08lX%08lX",
                                        (ulong)desc[idx].u.kid[0],
                                        (ulong)desc[idx].u.kid[1]);
          if (!pattern[npat])
            err = gpg_error_from_syserror ();
          else
            npat++;
        }
      else if(desc[idx].mode == KEYDB_SEARCH_MODE_SHORT_KID)
        {
          pattern[npat] = xtryasprintf ("0x%08lX", (ulong)desc[idx].u.kid[1]);
          if (!pattern[npat])
            err = gpg_error_from_syserror ();
          else
            npat++;
        }
      else if(desc[idx].mode == KEYDB_SEARCH_MODE_EXACT)
        {
          /* FIXME: We don't need this.  It is used as a dummy by
             keyserver_fetch which passes an entire URL.  Better use a
             separate function here. */
          pattern[npat] = xtrystrdup ("0x0000000000000000");
          if (!pattern[npat])
            err = gpg_error_from_syserror ();
          else
            {
              npat++;
              quiet = 1;
            }
        }
      else if (desc[idx].mode == KEYDB_SEARCH_MODE_NONE)
        continue;
      else
        BUG();

      if (err)
        {
          for (idx=0; idx < npat; idx++)
            xfree (pattern[idx]);
          xfree (pattern);
          return err;
        }

      if (!quiet && keyserver)
        {
          if (keyserver->host)
            log_info (_("requesting key %s from %s server %s\n"),
                      keystr_from_desc (&desc[idx]),
                      keyserver->scheme, keyserver->host);
          else
            log_info (_("requesting key %s from %s\n"),
                      keystr_from_desc (&desc[idx]), keyserver->uri);
        }
    }


  err = gpg_dirmngr_ks_get (ctrl, pattern, &datastream);
  for (idx=0; idx < npat; idx++)
    xfree (pattern[idx]);
  xfree (pattern);
  if (!err)
    {
      void *stats_handle;

//.........这里部分代码省略.........