Partially revert patch from 2014-03-04.

	* exception.h (exception::handler_installed): Declare.
	(exception::exception): Install vectored exception handler on x86_64.
	(exception::~exception): Remove for x86_64.
	* exceptions.cc (exception::handler_installed): Define.

1 files changed, 7 insertions, 17 deletions

diff --git a/winsup/cygwin/exception.h b/winsup/cygwin/exception.h
index 5b8b6da77..6792536c9 100644
--- a/winsup/cygwin/exception.h
+++ b/winsup/cygwin/exception.h
@@ -109,6 +109,7 @@ extern exception_list *_except_list asm ("%fs:0");
 class exception
 {
 #ifdef __x86_64__
+  static bool handler_installed;
   static int handle (LPEXCEPTION_POINTERS);
 #else
   exception_list el;
@@ -119,16 +120,11 @@ public:
   exception () __attribute__ ((always_inline))
   {
 #ifdef __x86_64__
-    /* Manually install SEH handler. */
-    asm (".l_startframe:						\n\
-	      .seh_handler __C_specific_handler, @except		\n\
-	      .seh_handlerdata						\n\
-	      .long 1							\n\
-	      .rva .l_startframe,					  \
-		   .l_endframe,						  \
-		   _ZN9exception6handleEP19_EXCEPTION_POINTERS,		  \
-		   .l_endframe						\n\
-	      .text							\n");
+    if (!handler_installed)
+      {
+	handler_installed = true;
+	AddVectoredExceptionHandler (1, handle);
+      }
 #else
     save = _except_list;
     el.handler = handle;
@@ -136,13 +132,7 @@ public:
     _except_list = ⪙
 #endif /* __x86_64__ */
   };
-#ifdef __x86_64__
-  ~exception () __attribute__ ((always_inline)) {
-    asm ("    nop							\n\
-	  .l_endframe:							\n\
-	      nop							\n");
-  }
-#else
+#ifndef __x86_64__
   ~exception () __attribute__ ((always_inline)) { _except_list = save; }
 #endif /* !__x86_64__ */
 };