From b9403c2035b22faea379a48e310f3a4c65c5acf2 Mon Sep 17 00:00:00 2001
From: dtc <dtc>
Date: Tue, 20 Feb 2001 20:54:32 +0000
Subject: [PATCH] o Have the print VOP allocated room on the number stack for
 the top   two register args popped by call_into_c, avoiding potential stack  
 corruption. Noted by Daniel Barlow.

---
 compiler/alpha/print.lisp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/compiler/alpha/print.lisp b/compiler/alpha/print.lisp
index 6d6659136..d67aea4fa 100644
--- a/compiler/alpha/print.lisp
+++ b/compiler/alpha/print.lisp
@@ -5,7 +5,7 @@
 ;;; Carnegie Mellon University, and has been placed in the public domain.
 ;;;
 (ext:file-comment
-  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/alpha/print.lisp,v 1.2 1994/10/31 04:39:51 ram Exp $")
+  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/alpha/print.lisp,v 1.3 2001/02/20 20:54:32 dtc Rel $")
 ;;;
 ;;; **********************************************************************
 ;;;
@@ -16,7 +16,10 @@
 
 (in-package "ALPHA")
 
-
+;;; Some room needs to be allocated on the number stack because call_into_c
+;;; pops two register args before calling into C and restores the NSP upon
+;;; return.
+;;;
 (define-vop (print)
   (:args (object :scs (descriptor-reg) :target a0))
   (:results (result :scs (descriptor-reg)))
@@ -34,7 +37,9 @@
 	(store-stack-tn nfp-save cur-nfp))
       (inst li (make-fixup "debug_print" :foreign) cfunc)
       (inst li (make-fixup "call_into_c" :foreign) temp)
+      (inst lda nsp-tn (- 16) nsp-tn)
       (inst jsr lip-tn temp (make-fixup "call_into_c" :foreign))
+      (inst lda nsp-tn 16 nsp-tn)
       (when cur-nfp
 	(maybe-load-stack-nfp-tn cur-nfp nfp-save temp))
       (move cfunc result))))
-- 
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