Port exception handling to 64 bit Cygwin.

* jmp.S (DEFUN): Separate definition for 64 bit Cygwin,
which doesn't use leading underscores and has an
unusual prologue.
(jmp_save, jmp_restore): Separately defined for 64 bit
Cygwin, due to use of Microsoft 64 bit calling conventions.

* signal.h (struct jmp): In x86-64 version, only on Cygwin,
new members: rsi and rdi. These registers are considered
nonvolatile and so are saved and restored by jmp_save and
jmp_restore.

1 files changed, 4 insertions, 0 deletions

diff --git a/signal.h b/signal.h
index e54a6c43..73ca1e24 100644
--- a/signal.h
+++ b/signal.h
@@ -62,6 +62,10 @@ struct jmp {
    unsigned long r13;
    unsigned long r14;
    unsigned long r15;
+#if __CYGWIN__
+   unsigned long rsi;
+   unsigned long rdi;
+#endif
 };
 
 #elif __arm__ && !__thumb__