--- mstools/posix/h/setjmp.h	2018/08/09 18:24:35	1.1.1.2
+++ mstools/posix/h/setjmp.h	2018/08/09 18:27:51	1.1.1.3
@@ -138,12 +138,43 @@ typedef struct __JUMP_BUFFER {
 #if defined(_ALPHA_)
 
 /*
- * All ALPHA implementations need _JBLEN of 2
+ * 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
 
+/*
+ * 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 */