1.0.47.9: Oh very funny

[sbcl.git] / src / assembly / x86-64 / assem-rtns.lisp

diff --git a/src/assembly/x86-64/assem-rtns.lisp b/src/assembly/x86-64/assem-rtns.lisp
index 5b51eef..b6ea237 100644 (file)
--- a/src/assembly/x86-64/assem-rtns.lisp
+++ b/src/assembly/x86-64/assem-rtns.lisp
@@ -39,8 +39,13 @@
   (inst cmp ecx (fixnumize 3))
   (inst jmp :e THREE-VALUES)
 
-  (inst mov ebx rbp-tn)
-  ;; Save the count, because the loop is going to destroy it.
+  ;; As per the calling convention EBX is expected to point at the SP
+  ;; before the stack frame.
+  (inst lea ebx (make-ea :qword :base rbp-tn
+                         :disp (* sp->fp-offset n-word-bytes)))
+
+  ;; Save the count, the return address and restore the frame pointer,
+  ;; because the loop is going to destroy them.
   (inst mov edx ecx)
   (inst mov eax (make-ea :qword :base rbp-tn
                          :disp (frame-byte-offset return-pc-save-offset)))
@@ -78,13 +83,12 @@
 
   ;; Handle the register arg cases.
   ZERO-VALUES
-  (inst mov ebx rbp-tn)
+  (inst lea ebx (make-ea :qword :base rbp-tn
+                         :disp (* sp->fp-offset n-word-bytes)))
   (inst mov edx nil-value)
   (inst mov edi edx)
   (inst mov esi edx)
-  (inst lea rsp-tn
-        (make-ea :qword :base ebx
-                 :disp (frame-byte-offset ocfp-save-offset)))
+  (inst mov rsp-tn rbp-tn)
   (inst stc)
   (inst pop rbp-tn)
   (inst ret)
@@ -93,33 +97,29 @@
   ;; check for this case when size > speed.
   ONE-VALUE
   (loadw edx esi -1)
-  (inst lea rsp-tn
-        (make-ea :qword :base rbp-tn
-                 :disp (frame-byte-offset ocfp-save-offset)))
+  (inst mov rsp-tn rbp-tn)
   (inst clc)
   (inst pop rbp-tn)
   (inst ret)
 
   TWO-VALUES
-  (inst mov ebx rbp-tn)
+  (inst lea ebx (make-ea :qword :base rbp-tn
+                         :disp (* sp->fp-offset n-word-bytes)))
   (loadw edx esi -1)
   (loadw edi esi -2)
   (inst mov esi nil-value)
-  (inst lea rsp-tn
-        (make-ea :qword :base ebx
-                 :disp (frame-byte-offset ocfp-save-offset)))
+  (inst mov rsp-tn rbp-tn)
   (inst stc)
   (inst pop rbp-tn)
   (inst ret)
 
   THREE-VALUES
-  (inst mov ebx rbp-tn)
+  (inst lea ebx (make-ea :qword :base rbp-tn
+                         :disp (* sp->fp-offset n-word-bytes)))
   (loadw edx esi -1)
   (loadw edi esi -2)
   (loadw esi esi -3)
-  (inst lea rsp-tn
-        (make-ea :qword :base ebx
-                 :disp (frame-byte-offset ocfp-save-offset)))
+  (inst mov rsp-tn rbp-tn)
   (inst stc)
   (inst pop rbp-tn)
   (inst ret))
@@ -207,7 +207,7 @@
 
   ;; Clear most of the stack.
   (inst lea rsp-tn
-        (make-ea :qword :base rbp-tn :disp (* -3 n-word-bytes)))
+        (make-ea :qword :base rbp-tn :disp (* (- sp->fp-offset 3) n-word-bytes)))
 
   ;; Push the return-pc so it looks like we just called.
   (pushw rbp-tn (frame-word-offset return-pc-save-offset))
@@ -218,7 +218,7 @@
                               fun-pointer-lowtag))))
 \f
 (define-assembly-routine (throw
-                          (:return-style :none))
+                          (:return-style :raw))
                          ((:arg target (descriptor-reg any-reg) rdx-offset)
                           (:arg start any-reg rbx-offset)
                           (:arg count any-reg rcx-offset)
@@ -230,7 +230,17 @@
 
   LOOP
 
-  (let ((error (generate-error-code nil 'unseen-throw-tag-error target)))
+  (let ((error (gen-label)))
+    (assemble (*elsewhere*)
+      (emit-label error)
+
+      ;; Fake up a stack frame so that backtraces come out right.
+      (inst push rbp-tn)
+      (inst mov rbp-tn rsp-tn)
+
+      (emit-error-break nil error-trap
+                        (error-number-or-lose 'unseen-throw-tag-error)
+                        (list target)))
     (inst or catch catch)               ; check for NULL pointer
     (inst jmp :z error))