Minor cleanup of ia64 unwind handler code.

	* frame.h (IA64_UNW_EHANDLER, IA64_UNW_UHANDLER): New.
	* config/ia64/frame-ia64.c (__get_personality): Return zero if neither
	EHANDLER nor UHANDLER bit is set.
	(__get_except_table): Likewise.

From-SVN: r35922

gcc/ChangeLog

+2000-08-23  Jim Wilson  <wilson@cygnus.com>
+
+	* frame.h (IA64_UNW_EHANDLER, IA64_UNW_UHANDLER): New.
+	* config/ia64/frame-ia64.c (__get_personality): Return zero if neither
+	EHANDLER nor UHANDLER bit is set.
+	(__get_except_table): Likewise.
+
 2000-08-23  Nick Clifton  <nickc@redhat.com>
 
 	* config/arm/lib1funcs.asm: Replace upper case condition codes

gcc/config/ia64/frame-ia64.c

@@ -1376,27 +1376,38 @@ __build_ia64_frame_state (pc, frame, bsp, sp, pc_base_ptr)
   return unw_info_ptr;
 }
 
-/* Given an unwind info pointer, return the personailty routine.  */
+/* Given an unwind info pointer, return the personality routine.  */
 void *
 __get_personality (ptr)
      unwind_info_ptr *ptr;
 {
   void **p;
+
+  /* There is a personality routine only if one of the EHANDLER or UHANDLER
+     bits is set.  */
+  if (! (IA64_UNW_HDR_FLAGS (ptr->header)
+	 & (IA64_UNW_EHANDLER|IA64_UNW_UHANDLER)))
+    return 0;
+
   p = (void **) (ptr->unwind_descriptors
 		 + IA64_UNW_HDR_LENGTH (ptr->header) * 8);
   return *p;
 }
 
+/* Given an unwind info pointer, return the exception table.  */
 void *
 __get_except_table (ptr)
      unwind_info_ptr *ptr;
 {
-  void **p, *table;
-  p = (void **) (ptr->unwind_descriptors
-		 + IA64_UNW_HDR_LENGTH (ptr->header) * 8);
-  /* If there is no personality, there is no handler data.  */
-  if (*p == 0)
+  void *table;
+
+  /* If there is no personality, there is no handler data.
+     There is a personality routine only if one of the EHANDLER or UHANDLER
+     bits is set.  */
+  if (! (IA64_UNW_HDR_FLAGS (ptr->header)
+	 & (IA64_UNW_EHANDLER|IA64_UNW_UHANDLER)))
     return 0;
+
   table = (void *) (ptr->unwind_descriptors
 		    + IA64_UNW_HDR_LENGTH (ptr->header) * 8 + 8);
   return table;

gcc/frame.h

@@ -267,6 +267,10 @@ typedef struct unwind_info_ptr
 #define IA64_UNW_HDR_FLAGS(x)	(((x) >> 32) & 0xffffUL)
 #define IA64_UNW_HDR_VERSION(x)	(((x) >> 48) & 0xffffUL)
 
+/* Header flag bits, after extraction by IA64_UNW_HDR_FLAGS.  */
+#define IA64_UNW_EHANDLER	0x1
+#define IA64_UNW_UHANDLER	0x2
+
 extern unwind_info_ptr *__build_ia64_frame_state (unsigned char *, 
 						  ia64_frame_state *,
 						  void *, void *,