Fix linux kernel miscompilation.

[pf3gnuchains/gcc-fork.git] / gcc / config / ia64 / ia64.c

diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index 8921a8a..871c52d 100644 (file)
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -276,6 +276,7 @@ static tree ia64_handle_model_attribute (tree *, tree, tree, int, bool *);
 static void ia64_encode_section_info (tree, rtx, int);
 static rtx ia64_struct_value_rtx (tree, int);
 static tree ia64_gimplify_va_arg (tree, tree, tree *, tree *);
+static bool ia64_scalar_mode_supported_p (enum machine_mode mode);
 
 \f
 /* Table of valid machine attributes.  */
@@ -416,6 +417,9 @@ static const struct attribute_spec ia64_attribute_table[] =
 #undef TARGET_UNWIND_EMIT
 #define TARGET_UNWIND_EMIT process_for_unwind_directive
 
+#undef TARGET_SCALAR_MODE_SUPPORTED_P
+#define TARGET_SCALAR_MODE_SUPPORTED_P ia64_scalar_mode_supported_p
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 \f
 typedef enum
@@ -3363,6 +3367,12 @@ ia64_pass_by_reference (CUMULATIVE_ARGS *cum ATTRIBUTE_UNUSED,
 static bool
 ia64_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED)
 {
+  /* 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);
@@ -3379,7 +3389,7 @@ ia64_gimplify_va_arg (tree valist, tree type, tree *pre_p, tree *post_p)
     {
       tree ptrtype = build_pointer_type (type);
       tree addr = std_gimplify_va_arg_expr (valist, ptrtype, pre_p, post_p);
-      return build_fold_indirect_ref (addr);
+      return build_va_arg_indirect_ref (addr);
     }
 
   /* Aggregate arguments with alignment larger than 8 bytes start at
@@ -8478,4 +8488,29 @@ ia64_struct_value_rtx (tree fntype,
   return gen_rtx_REG (Pmode, GR_REG (8));
 }
 
+static bool
+ia64_scalar_mode_supported_p (enum machine_mode mode)
+{
+  switch (mode)
+    {
+    case QImode:
+    case HImode:
+    case SImode:
+    case DImode:
+    case TImode:
+      return true;
+
+    case SFmode:
+    case DFmode:
+    case XFmode:
+      return true;
+
+    case TFmode:
+      return TARGET_HPUX;
+
+    default:
+      return false;
+    }
+}
+
 #include "gt-ia64.h"