cea6a4ba8a
This patch is part of an effort to unify the panic_on_oops behaviour across all architectures that implement it. It was pointed out to me by Andi Kleen that if an oops has occured in interrupt context, then calling sleep() in the oops path will only cause a panic, and that it would be really better for it not to be in the path at all. This patch removes the ssleep() call and reworks the console message accordinly. I have a slght concern that the resulting console message is too long, feedback welcome. For powerpc it also unifies the 32bit and 64bit behaviour. Fror x86_64, this patch only updates the console message, as ssleep() is already not present. Signed-off-by: Horms <horms@verge.net.au> Acked-by: Paul Mackerras <paulus@samba.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
664 lines
17 KiB
C
664 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/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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panic("Fatal exception: panic_on_oops");
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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)
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{
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struct illegal_op_return rv;
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struct siginfo si;
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char buf[128];
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#ifdef CONFIG_IA64_BRL_EMU
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{
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extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
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rv = ia64_emulate_brl(®s, ec);
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if (rv.fkt != (unsigned long) -1)
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return rv;
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}
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#endif
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sprintf(buf, "IA-64 Illegal operation fault");
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die_if_kernel(buf, ®s, 0);
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memset(&si, 0, sizeof(si));
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si.si_signo = SIGILL;
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si.si_code = ILL_ILLOPC;
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si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(®s)->ri);
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force_sig_info(SIGILL, &si, current);
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rv.fkt = 0;
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return rv;
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}
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void __kprobes
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ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
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unsigned long iim, unsigned long itir, long arg5, long arg6,
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long arg7, struct pt_regs regs)
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{
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unsigned long code, error = isr, iip;
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struct siginfo siginfo;
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char buf[128];
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int result, sig;
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static const char *reason[] = {
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"IA-64 Illegal Operation fault",
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"IA-64 Privileged Operation fault",
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"IA-64 Privileged Register fault",
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"IA-64 Reserved Register/Field fault",
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"Disabled Instruction Set Transition fault",
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"Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
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"Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
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"Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
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};
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if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
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/*
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* This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
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* the lfetch.
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*/
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ia64_psr(®s)->ed = 1;
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return;
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}
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iip = regs.cr_iip + ia64_psr(®s)->ri;
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switch (vector) {
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case 24: /* General Exception */
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code = (isr >> 4) & 0xf;
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sprintf(buf, "General Exception: %s%s", reason[code],
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(code == 3) ? ((isr & (1UL << 37))
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? " (RSE access)" : " (data access)") : "");
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if (code == 8) {
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# ifdef CONFIG_IA64_PRINT_HAZARDS
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printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
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current->comm, current->pid,
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regs.cr_iip + ia64_psr(®s)->ri, regs.pr);
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# endif
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return;
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}
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break;
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|
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case 25: /* Disabled FP-Register */
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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);
|
|
}
|