X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Finterr.c;h=a5f8650c5ecd9109b5079bb9e91d8716be293844;hb=3bd7a97d1b11a2b0aee086ef211cae807f3dfc35;hp=1fd412c706507226646b1b94998c6ca05d806c26;hpb=62272dd0e7254b19a484fa1a2050ba15504d3ece;p=sbcl.git

diff --git a/src/runtime/interr.c b/src/runtime/interr.c
index 1fd412c..a5f8650 100644
--- a/src/runtime/interr.c
+++ b/src/runtime/interr.c
@@ -152,6 +152,16 @@ describe_internal_error(os_context_t *context)
 
 lispobj debug_print(lispobj string)
 {
-    fprintf(stderr, "%s\n", (char *)(((struct vector *)PTR(string))->data));
+    /* This is a kludge.  It's not actually safe - in general - to use 
+       %primitive print on the alpha, because it skips half of the
+       number stack setup that should usually be done on a function call,
+       so the called routine (i.e. this one) ends up being able to overwrite
+       local variables in the caller.  Rather than fix this everywhere
+       that %primitive print is used (it's only a debugging aid anyway)
+       we just put guarantee our safety by putting an unused buffer on
+       the stack before doing anything else here */
+    char untouched[32]; /* GCC warns about not using this, but that's the point.. */
+    fprintf(stderr, "%s\n", 
+	    (char *)(((struct vector *)native_pointer(string))->data),untouched);
     return NIL;
 }