e041c68341
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
668 lines
17 KiB
C
668 lines
17 KiB
C
/*
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* Architecture-specific trap handling.
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*
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* Copyright (C) 1998-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* 05/12/00 grao <goutham.rao@intel.com> : added isr in siginfo for SIGFPE
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/tty.h>
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#include <linux/vt_kern.h> /* For unblank_screen() */
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#include <linux/module.h> /* for EXPORT_SYMBOL */
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#include <linux/hardirq.h>
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#include <linux/kprobes.h>
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#include <linux/delay.h> /* for ssleep() */
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#include <asm/fpswa.h>
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#include <asm/ia32.h>
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#include <asm/intrinsics.h>
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/kdebug.h>
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extern spinlock_t timerlist_lock;
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fpswa_interface_t *fpswa_interface;
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EXPORT_SYMBOL(fpswa_interface);
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ATOMIC_NOTIFIER_HEAD(ia64die_chain);
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int
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register_die_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&ia64die_chain, nb);
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}
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EXPORT_SYMBOL_GPL(register_die_notifier);
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int
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unregister_die_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&ia64die_chain, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_die_notifier);
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void __init
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trap_init (void)
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{
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if (ia64_boot_param->fpswa)
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/* FPSWA fixup: make the interface pointer a kernel virtual address: */
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fpswa_interface = __va(ia64_boot_param->fpswa);
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}
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/*
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* Unlock any spinlocks which will prevent us from getting the message out (timerlist_lock
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* is acquired through the console unblank code)
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*/
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void
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bust_spinlocks (int yes)
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{
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int loglevel_save = console_loglevel;
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if (yes) {
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oops_in_progress = 1;
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return;
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}
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#ifdef CONFIG_VT
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unblank_screen();
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#endif
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oops_in_progress = 0;
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/*
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* OK, the message is on the console. Now we call printk() without
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* oops_in_progress set so that printk will give klogd a poke. Hold onto
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* your hats...
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*/
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console_loglevel = 15; /* NMI oopser may have shut the console up */
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printk(" ");
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console_loglevel = loglevel_save;
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}
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void
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die (const char *str, struct pt_regs *regs, long err)
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{
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static struct {
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spinlock_t lock;
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u32 lock_owner;
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int lock_owner_depth;
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} die = {
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.lock = SPIN_LOCK_UNLOCKED,
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.lock_owner = -1,
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.lock_owner_depth = 0
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};
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static int die_counter;
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int cpu = get_cpu();
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if (die.lock_owner != cpu) {
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console_verbose();
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spin_lock_irq(&die.lock);
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die.lock_owner = cpu;
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die.lock_owner_depth = 0;
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bust_spinlocks(1);
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}
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put_cpu();
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if (++die.lock_owner_depth < 3) {
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printk("%s[%d]: %s %ld [%d]\n",
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current->comm, current->pid, str, err, ++die_counter);
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(void) notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
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show_regs(regs);
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} else
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printk(KERN_ERR "Recursive die() failure, output suppressed\n");
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bust_spinlocks(0);
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die.lock_owner = -1;
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spin_unlock_irq(&die.lock);
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if (panic_on_oops) {
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printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
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ssleep(5);
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panic("Fatal exception");
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}
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do_exit(SIGSEGV);
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}
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void
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die_if_kernel (char *str, struct pt_regs *regs, long err)
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{
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if (!user_mode(regs))
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die(str, regs, err);
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}
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void
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__kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
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{
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siginfo_t siginfo;
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int sig, code;
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/* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
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siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
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siginfo.si_imm = break_num;
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siginfo.si_flags = 0; /* clear __ISR_VALID */
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siginfo.si_isr = 0;
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switch (break_num) {
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case 0: /* unknown error (used by GCC for __builtin_abort()) */
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if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
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== NOTIFY_STOP)
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return;
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die_if_kernel("bugcheck!", regs, break_num);
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sig = SIGILL; code = ILL_ILLOPC;
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break;
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case 1: /* integer divide by zero */
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sig = SIGFPE; code = FPE_INTDIV;
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break;
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case 2: /* integer overflow */
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sig = SIGFPE; code = FPE_INTOVF;
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break;
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case 3: /* range check/bounds check */
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sig = SIGFPE; code = FPE_FLTSUB;
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break;
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case 4: /* null pointer dereference */
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sig = SIGSEGV; code = SEGV_MAPERR;
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break;
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case 5: /* misaligned data */
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sig = SIGSEGV; code = BUS_ADRALN;
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break;
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case 6: /* decimal overflow */
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sig = SIGFPE; code = __FPE_DECOVF;
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break;
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case 7: /* decimal divide by zero */
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sig = SIGFPE; code = __FPE_DECDIV;
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break;
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case 8: /* packed decimal error */
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sig = SIGFPE; code = __FPE_DECERR;
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break;
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case 9: /* invalid ASCII digit */
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sig = SIGFPE; code = __FPE_INVASC;
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break;
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case 10: /* invalid decimal digit */
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sig = SIGFPE; code = __FPE_INVDEC;
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break;
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case 11: /* paragraph stack overflow */
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sig = SIGSEGV; code = __SEGV_PSTKOVF;
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break;
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case 0x3f000 ... 0x3ffff: /* bundle-update in progress */
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sig = SIGILL; code = __ILL_BNDMOD;
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break;
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default:
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if (break_num < 0x40000 || break_num > 0x100000)
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die_if_kernel("Bad break", regs, break_num);
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if (break_num < 0x80000) {
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sig = SIGILL; code = __ILL_BREAK;
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} else {
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if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
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== NOTIFY_STOP)
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return;
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sig = SIGTRAP; code = TRAP_BRKPT;
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}
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}
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siginfo.si_signo = sig;
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siginfo.si_errno = 0;
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siginfo.si_code = code;
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force_sig_info(sig, &siginfo, current);
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}
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/*
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* disabled_fph_fault() is called when a user-level process attempts to access f32..f127
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* and it doesn't own the fp-high register partition. When this happens, we save the
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* current fph partition in the task_struct of the fpu-owner (if necessary) and then load
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* the fp-high partition of the current task (if necessary). Note that the kernel has
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* access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
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* care of clearing psr.dfh.
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*/
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static inline void
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disabled_fph_fault (struct pt_regs *regs)
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{
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struct ia64_psr *psr = ia64_psr(regs);
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/* first, grant user-level access to fph partition: */
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psr->dfh = 0;
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/*
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* Make sure that no other task gets in on this processor
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* while we're claiming the FPU
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*/
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preempt_disable();
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#ifndef CONFIG_SMP
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{
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struct task_struct *fpu_owner
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= (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
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if (ia64_is_local_fpu_owner(current)) {
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preempt_enable_no_resched();
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return;
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}
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if (fpu_owner)
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ia64_flush_fph(fpu_owner);
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}
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#endif /* !CONFIG_SMP */
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ia64_set_local_fpu_owner(current);
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if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
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__ia64_load_fpu(current->thread.fph);
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psr->mfh = 0;
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} else {
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__ia64_init_fpu();
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/*
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* Set mfh because the state in thread.fph does not match the state in
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* the fph partition.
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*/
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psr->mfh = 1;
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}
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preempt_enable_no_resched();
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}
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static inline int
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fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
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struct pt_regs *regs)
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{
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fp_state_t fp_state;
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fpswa_ret_t ret;
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if (!fpswa_interface)
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return -1;
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memset(&fp_state, 0, sizeof(fp_state_t));
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/*
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* compute fp_state. only FP registers f6 - f11 are used by the
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* kernel, so set those bits in the mask and set the low volatile
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* pointer to point to these registers.
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*/
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fp_state.bitmask_low64 = 0xfc0; /* bit6..bit11 */
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fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) ®s->f6;
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/*
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* unsigned long (*EFI_FPSWA) (
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* unsigned long trap_type,
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* void *Bundle,
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* unsigned long *pipsr,
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* unsigned long *pfsr,
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* unsigned long *pisr,
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* unsigned long *ppreds,
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* unsigned long *pifs,
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* void *fp_state);
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*/
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ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
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(unsigned long *) ipsr, (unsigned long *) fpsr,
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(unsigned long *) isr, (unsigned long *) pr,
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(unsigned long *) ifs, &fp_state);
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return ret.status;
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}
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/*
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* Handle floating-point assist faults and traps.
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*/
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static int
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handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
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{
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long exception, bundle[2];
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unsigned long fault_ip;
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struct siginfo siginfo;
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static int fpu_swa_count = 0;
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static unsigned long last_time;
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fault_ip = regs->cr_iip;
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if (!fp_fault && (ia64_psr(regs)->ri == 0))
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fault_ip -= 16;
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if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
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return -1;
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if (jiffies - last_time > 5*HZ)
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fpu_swa_count = 0;
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if ((fpu_swa_count < 4) && !(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT)) {
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last_time = jiffies;
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++fpu_swa_count;
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printk(KERN_WARNING
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"%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
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current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr);
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}
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exception = fp_emulate(fp_fault, bundle, ®s->cr_ipsr, ®s->ar_fpsr, &isr, ®s->pr,
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®s->cr_ifs, regs);
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if (fp_fault) {
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if (exception == 0) {
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/* emulation was successful */
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ia64_increment_ip(regs);
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} else if (exception == -1) {
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printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
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return -1;
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} else {
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/* is next instruction a trap? */
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if (exception & 2) {
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ia64_increment_ip(regs);
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}
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siginfo.si_signo = SIGFPE;
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siginfo.si_errno = 0;
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siginfo.si_code = __SI_FAULT; /* default code */
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siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
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if (isr & 0x11) {
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siginfo.si_code = FPE_FLTINV;
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} else if (isr & 0x22) {
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/* denormal operand gets the same si_code as underflow
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* see arch/i386/kernel/traps.c:math_error() */
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siginfo.si_code = FPE_FLTUND;
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} else if (isr & 0x44) {
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siginfo.si_code = FPE_FLTDIV;
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}
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siginfo.si_isr = isr;
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siginfo.si_flags = __ISR_VALID;
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siginfo.si_imm = 0;
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force_sig_info(SIGFPE, &siginfo, current);
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}
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} else {
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if (exception == -1) {
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printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
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return -1;
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} else if (exception != 0) {
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/* raise exception */
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siginfo.si_signo = SIGFPE;
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siginfo.si_errno = 0;
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siginfo.si_code = __SI_FAULT; /* default code */
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siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
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if (isr & 0x880) {
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siginfo.si_code = FPE_FLTOVF;
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} else if (isr & 0x1100) {
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siginfo.si_code = FPE_FLTUND;
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} else if (isr & 0x2200) {
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siginfo.si_code = FPE_FLTRES;
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}
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siginfo.si_isr = isr;
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siginfo.si_flags = __ISR_VALID;
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siginfo.si_imm = 0;
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force_sig_info(SIGFPE, &siginfo, current);
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}
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}
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return 0;
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}
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struct illegal_op_return {
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unsigned long fkt, arg1, arg2, arg3;
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};
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struct illegal_op_return
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ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
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long arg4, long arg5, long arg6, long arg7,
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struct pt_regs regs)
|
|
{
|
|
struct illegal_op_return rv;
|
|
struct siginfo si;
|
|
char buf[128];
|
|
|
|
#ifdef CONFIG_IA64_BRL_EMU
|
|
{
|
|
extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
|
|
|
|
rv = ia64_emulate_brl(®s, ec);
|
|
if (rv.fkt != (unsigned long) -1)
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
sprintf(buf, "IA-64 Illegal operation fault");
|
|
die_if_kernel(buf, ®s, 0);
|
|
|
|
memset(&si, 0, sizeof(si));
|
|
si.si_signo = SIGILL;
|
|
si.si_code = ILL_ILLOPC;
|
|
si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(®s)->ri);
|
|
force_sig_info(SIGILL, &si, current);
|
|
rv.fkt = 0;
|
|
return rv;
|
|
}
|
|
|
|
void __kprobes
|
|
ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
|
|
unsigned long iim, unsigned long itir, long arg5, long arg6,
|
|
long arg7, struct pt_regs regs)
|
|
{
|
|
unsigned long code, error = isr, iip;
|
|
struct siginfo siginfo;
|
|
char buf[128];
|
|
int result, sig;
|
|
static const char *reason[] = {
|
|
"IA-64 Illegal Operation fault",
|
|
"IA-64 Privileged Operation fault",
|
|
"IA-64 Privileged Register fault",
|
|
"IA-64 Reserved Register/Field fault",
|
|
"Disabled Instruction Set Transition fault",
|
|
"Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
|
|
"Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
|
|
"Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
|
|
};
|
|
|
|
if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
|
|
/*
|
|
* This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
|
|
* the lfetch.
|
|
*/
|
|
ia64_psr(®s)->ed = 1;
|
|
return;
|
|
}
|
|
|
|
iip = regs.cr_iip + ia64_psr(®s)->ri;
|
|
|
|
switch (vector) {
|
|
case 24: /* General Exception */
|
|
code = (isr >> 4) & 0xf;
|
|
sprintf(buf, "General Exception: %s%s", reason[code],
|
|
(code == 3) ? ((isr & (1UL << 37))
|
|
? " (RSE access)" : " (data access)") : "");
|
|
if (code == 8) {
|
|
# ifdef CONFIG_IA64_PRINT_HAZARDS
|
|
printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
|
|
current->comm, current->pid,
|
|
regs.cr_iip + ia64_psr(®s)->ri, regs.pr);
|
|
# endif
|
|
return;
|
|
}
|
|
break;
|
|
|
|
case 25: /* Disabled FP-Register */
|
|
if (isr & 2) {
|
|
disabled_fph_fault(®s);
|
|
return;
|
|
}
|
|
sprintf(buf, "Disabled FPL fault---not supposed to happen!");
|
|
break;
|
|
|
|
case 26: /* NaT Consumption */
|
|
if (user_mode(®s)) {
|
|
void __user *addr;
|
|
|
|
if (((isr >> 4) & 0xf) == 2) {
|
|
/* NaT page consumption */
|
|
sig = SIGSEGV;
|
|
code = SEGV_ACCERR;
|
|
addr = (void __user *) ifa;
|
|
} else {
|
|
/* register NaT consumption */
|
|
sig = SIGILL;
|
|
code = ILL_ILLOPN;
|
|
addr = (void __user *) (regs.cr_iip
|
|
+ ia64_psr(®s)->ri);
|
|
}
|
|
siginfo.si_signo = sig;
|
|
siginfo.si_code = code;
|
|
siginfo.si_errno = 0;
|
|
siginfo.si_addr = addr;
|
|
siginfo.si_imm = vector;
|
|
siginfo.si_flags = __ISR_VALID;
|
|
siginfo.si_isr = isr;
|
|
force_sig_info(sig, &siginfo, current);
|
|
return;
|
|
} else if (ia64_done_with_exception(®s))
|
|
return;
|
|
sprintf(buf, "NaT consumption");
|
|
break;
|
|
|
|
case 31: /* Unsupported Data Reference */
|
|
if (user_mode(®s)) {
|
|
siginfo.si_signo = SIGILL;
|
|
siginfo.si_code = ILL_ILLOPN;
|
|
siginfo.si_errno = 0;
|
|
siginfo.si_addr = (void __user *) iip;
|
|
siginfo.si_imm = vector;
|
|
siginfo.si_flags = __ISR_VALID;
|
|
siginfo.si_isr = isr;
|
|
force_sig_info(SIGILL, &siginfo, current);
|
|
return;
|
|
}
|
|
sprintf(buf, "Unsupported data reference");
|
|
break;
|
|
|
|
case 29: /* Debug */
|
|
case 35: /* Taken Branch Trap */
|
|
case 36: /* Single Step Trap */
|
|
if (fsys_mode(current, ®s)) {
|
|
extern char __kernel_syscall_via_break[];
|
|
/*
|
|
* Got a trap in fsys-mode: Taken Branch Trap
|
|
* and Single Step trap need special handling;
|
|
* Debug trap is ignored (we disable it here
|
|
* and re-enable it in the lower-privilege trap).
|
|
*/
|
|
if (unlikely(vector == 29)) {
|
|
set_thread_flag(TIF_DB_DISABLED);
|
|
ia64_psr(®s)->db = 0;
|
|
ia64_psr(®s)->lp = 1;
|
|
return;
|
|
}
|
|
/* re-do the system call via break 0x100000: */
|
|
regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
|
|
ia64_psr(®s)->ri = 0;
|
|
ia64_psr(®s)->cpl = 3;
|
|
return;
|
|
}
|
|
switch (vector) {
|
|
case 29:
|
|
siginfo.si_code = TRAP_HWBKPT;
|
|
#ifdef CONFIG_ITANIUM
|
|
/*
|
|
* Erratum 10 (IFA may contain incorrect address) now has
|
|
* "NoFix" status. There are no plans for fixing this.
|
|
*/
|
|
if (ia64_psr(®s)->is == 0)
|
|
ifa = regs.cr_iip;
|
|
#endif
|
|
break;
|
|
case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break;
|
|
case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break;
|
|
}
|
|
if (notify_die(DIE_FAULT, "ia64_fault", ®s, vector, siginfo.si_code, SIGTRAP)
|
|
== NOTIFY_STOP)
|
|
return;
|
|
siginfo.si_signo = SIGTRAP;
|
|
siginfo.si_errno = 0;
|
|
siginfo.si_addr = (void __user *) ifa;
|
|
siginfo.si_imm = 0;
|
|
siginfo.si_flags = __ISR_VALID;
|
|
siginfo.si_isr = isr;
|
|
force_sig_info(SIGTRAP, &siginfo, current);
|
|
return;
|
|
|
|
case 32: /* fp fault */
|
|
case 33: /* fp trap */
|
|
result = handle_fpu_swa((vector == 32) ? 1 : 0, ®s, isr);
|
|
if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
|
|
siginfo.si_signo = SIGFPE;
|
|
siginfo.si_errno = 0;
|
|
siginfo.si_code = FPE_FLTINV;
|
|
siginfo.si_addr = (void __user *) iip;
|
|
siginfo.si_flags = __ISR_VALID;
|
|
siginfo.si_isr = isr;
|
|
siginfo.si_imm = 0;
|
|
force_sig_info(SIGFPE, &siginfo, current);
|
|
}
|
|
return;
|
|
|
|
case 34:
|
|
if (isr & 0x2) {
|
|
/* Lower-Privilege Transfer Trap */
|
|
|
|
/* If we disabled debug traps during an fsyscall,
|
|
* re-enable them here.
|
|
*/
|
|
if (test_thread_flag(TIF_DB_DISABLED)) {
|
|
clear_thread_flag(TIF_DB_DISABLED);
|
|
ia64_psr(®s)->db = 1;
|
|
}
|
|
|
|
/*
|
|
* Just clear PSR.lp and then return immediately:
|
|
* all the interesting work (e.g., signal delivery)
|
|
* is done in the kernel exit path.
|
|
*/
|
|
ia64_psr(®s)->lp = 0;
|
|
return;
|
|
} else {
|
|
/* Unimplemented Instr. Address Trap */
|
|
if (user_mode(®s)) {
|
|
siginfo.si_signo = SIGILL;
|
|
siginfo.si_code = ILL_BADIADDR;
|
|
siginfo.si_errno = 0;
|
|
siginfo.si_flags = 0;
|
|
siginfo.si_isr = 0;
|
|
siginfo.si_imm = 0;
|
|
siginfo.si_addr = (void __user *) iip;
|
|
force_sig_info(SIGILL, &siginfo, current);
|
|
return;
|
|
}
|
|
sprintf(buf, "Unimplemented Instruction Address fault");
|
|
}
|
|
break;
|
|
|
|
case 45:
|
|
#ifdef CONFIG_IA32_SUPPORT
|
|
if (ia32_exception(®s, isr) == 0)
|
|
return;
|
|
#endif
|
|
printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
|
|
printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
|
|
iip, ifa, isr);
|
|
force_sig(SIGSEGV, current);
|
|
break;
|
|
|
|
case 46:
|
|
#ifdef CONFIG_IA32_SUPPORT
|
|
if (ia32_intercept(®s, isr) == 0)
|
|
return;
|
|
#endif
|
|
printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
|
|
printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
|
|
iip, ifa, isr, iim);
|
|
force_sig(SIGSEGV, current);
|
|
return;
|
|
|
|
case 47:
|
|
sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
|
|
break;
|
|
|
|
default:
|
|
sprintf(buf, "Fault %lu", vector);
|
|
break;
|
|
}
|
|
die_if_kernel(buf, ®s, error);
|
|
force_sig(SIGILL, current);
|
|
}
|