On Sat, Dec 29, 2018 at 06:03:42PM +0300, Ivan Zakharyaschev wrote:
[...]
> BTW, saving and forgetting the type of the original fault doesn't seem
> to be something expensive to implement (after some thought): when a
> register is marked as invalid, it shouldn't matter anymore what value
> it holds. So, the same register can be used to save the information
> about the type of the fault.

Note that SIGILL, SIGFPE, SIGSEGV, and SIGBUS come with si_addr specifying
the memory location which caused the fault.  When memory fault is
transformed into illegal operand failt, the location of the original
memory fault is likely lost, too - you can easily check this hypothesis
by installing a signal handler: if si_addr is not 0xbad from your example,
then it's been lost.


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ldv