[Xen-devel] exception interception

[X <studyxen@xxxxxxxxx>]

Hello,

Could someone kindly point me to the code in Xen for handling the exceptions intercepted from PV guest kernels?

Thanks. 

===More detail===

I was looking at some futex code in a guest kernel. The kernel code below must have caused an exception and thus trapped into Xen. But I have not figured out where exactly Xen processes the intercepted exception. 

from guest kernel's arch/x86/include/asm/futex.h, in function futex_atomic_cmpxchg_inatomic

asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"

    "2:\t.section .fixup, \"ax\"\n"

    "3:\tmov     %3, %0\n"

    "\tjmp     2b\n"

    "\t.previous\n"

    _ASM_EXTABLE(1b, 3b)

    : "+r" (ret), "=a" (oldval), "+m" (*uaddr)

    : "i" (-EFAULT), "r" (newval), "1" (oldval)

    : "memory"

);

==========

X

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