Add SB-SYS:SAP-REF-LISPOBJ.

[sbcl.git] / src / compiler / x86-64 / debug.lisp

diff --git a/src/compiler/x86-64/debug.lisp b/src/compiler/x86-64/debug.lisp
index 5ab67c6..ef6e0e2 100644 (file)
--- a/src/compiler/x86-64/debug.lisp
+++ b/src/compiler/x86-64/debug.lisp
@@ -43,7 +43,8 @@
     (move temp offset)
     (inst neg temp)
     (inst mov result
-          (make-ea :qword :base sap :disp (- n-word-bytes) :index temp))))
+          (make-ea :qword :base sap :disp (frame-byte-offset 0) :index temp
+                   :scale (ash 1 (- word-shift n-fixnum-tag-bits))))))
 
 (define-vop (read-control-stack-c)
   (:translate stack-ref)
@@ -55,7 +56,7 @@
   (:result-types *)
   (:generator 5
     (inst mov result (make-ea :qword :base sap
-                              :disp (- (* (1+ index) n-word-bytes))))))
+                              :disp (frame-byte-offset index)))))
 
 (define-vop (write-control-stack)
   (:translate %set-stack-ref)
@@ -71,7 +72,9 @@
     (move temp offset)
     (inst neg temp)
     (inst mov
-          (make-ea :qword :base sap :disp (- n-word-bytes) :index temp) value)
+          (make-ea :qword :base sap :disp (frame-byte-offset 0) :index temp
+                   :scale (ash 1 (- word-shift n-fixnum-tag-bits)))
+          value)
     (move result value)))
 
 (define-vop (write-control-stack-c)
@@ -84,8 +87,7 @@
   (:results (result :scs (descriptor-reg)))
   (:result-types *)
   (:generator 5
-    (inst mov (make-ea :qword :base sap
-                       :disp (- (* (1+ index) n-word-bytes)))
+    (inst mov (make-ea :qword :base sap :disp (frame-byte-offset index))
           value)
     (move result value)))