--- mstools/h/setjmp.h	2018/08/09 18:22:57	1.1.1.4
+++ mstools/h/setjmp.h	2018/08/09 18:25:19	1.1.1.5
@@ -122,18 +122,60 @@ typedef struct __JUMP_BUFFER {
 
 #endif
 
+
 #if defined(_ALPHA_)
 
 /*
- * All ALPHA implementations need _JBLEN of 2
+ * The Alpha C8/GEM C compiler uses an intrinsic _setjmp.
+ * The Alpha acc compiler implements setjmp as a function.
+ */
+
+#ifdef _MSC_VER
+#ifndef _INC_SETJMPEX
+#undef _setjmp
+#define setjmp	_setjmp
+#endif
+#endif
+
+/*
+ * Alpha implementations use a _JBLEN of 24 quadwords.
+ * A double is used only to obtain quadword size and alignment.
  */
 
-#define _JBLEN  2
+#define _JBLEN  24
 #define _JBTYPE double
 
-#endif
+/* 
+ * Define jump buffer layout for Alpha setjmp/longjmp.
+ * A double is used only to obtain quadword size and alignment.
+ */
 
+typedef struct __JUMP_BUFFER {
+    unsigned long Fp;
+    unsigned long Pc;
+    unsigned long Seb;
+    unsigned long Type;
+    double FltF2;
+    double FltF3;
+    double FltF4;
+    double FltF5;
+    double FltF6;
+    double FltF7;
+    double FltF8;
+    double FltF9;
+    double IntS0;
+    double IntS1;
+    double IntS2;
+    double IntS3;
+    double IntS4;
+    double IntS5;
+    double IntS6;
+    double IntSp;
+    double Fir;
+    double Fill[5];
+} _JUMP_BUFFER;
 
+#endif
 
 
 /* define the buffer type for holding the state information */