Fix linux kernel miscompilation.

PR target/17455
* config/ia64/ia64.c (ia64_function_ok_for_sibcall): Return false
if current_function_decl is a sibcall.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@87574 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d962016..3923876 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2004-09-15  James E Wilson  <wilson@specifixinc.com>
+
+       PR target/17455
+       * config/ia64/ia64.c (ia64_function_ok_for_sibcall): Return false
+       if current_function_decl is a sibcall.
+

 2004-09-15  Mark Mitchell  <mark@codesourcery.com>
 
        * varasm.c (default_function_rdodata_section): Make sure to pass
 2004-09-15  Mark Mitchell  <mark@codesourcery.com>
 
        * varasm.c (default_function_rdodata_section): Make sure to pass

diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index b85e1c2..871c52d 100644 (file)
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -3367,6 +3367,12 @@ ia64_pass_by_reference (CUMULATIVE_ARGS *cum ATTRIBUTE_UNUSED,
 static bool
 ia64_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED)
 {
 static bool
 ia64_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED)
 {

+  /* We can't perform a sibcall if the current function has the syscall_linkage
+     attribute.  */
+  if (lookup_attribute ("syscall_linkage",
+                       TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl))))
+    return false;
+

   /* We must always return with our current GP.  This means we can
      only sibcall to functions defined in the current module.  */
   return decl && (*targetm.binds_local_p) (decl);
   /* We must always return with our current GP.  This means we can
      only sibcall to functions defined in the current module.  */
   return decl && (*targetm.binds_local_p) (decl);