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x86_64: Handle myfault exceptions when running on alternate signal stack

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x86_64 only:
        * cygtls.cc (san::leave): Restore _my_tls.andreas.
        * cygtls.h (class san):  Add _clemente as in 32 bit case.  Add ret and
        frame members.
        (san::san): Handle _my_tls.andreas as on 32 bit.  Take parameter and
        write it to new member ret.  Store current stack pointer in frame.
        (san::~san): New destructor to restore _my_tls.andreas.
        (__try): Use __l_except address as parameter to san::san.
        * dcrt0.cc (dll_crt0_0): Add myfault_altstack_handler as vectored
        continuation handler.
        * exception.h (myfault_altstack_handler): Declare.
        * exceptions.cc (myfault_altstack_handler): New function.  Explain what
        it's good for.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-07-07 20:45:06 +02:00
parent 29a1263227
commit 60f10c64aa
5 changed files with 71 additions and 2 deletions
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5
winsup/cygwin/dcrt0.cc
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@@ -800,6 +800,11 @@ dll_crt0_0 ()
if (!dynamically_loaded)
sigproc_init ();
#ifdef __x86_64__
/* See comment preceeding myfault_altstack_handler in exception.cc. */
AddVectoredContinueHandler (0, myfault_altstack_handler);
#endif
debug_printf ("finished dll_crt0_0 initialization");
}