Bring RETURN_VALUE_ON_STACK under gdbarch's control.

* gdbarch.sh (RETURN_VALUE_ON_STACK): New entry.
* gdbarch.c, gdbarch.h: Regenerated.
* arch-utils.c (default_return_value_on_stack): New function.
* arch-utils.h (default_return_value_on_stack): New declaration.
* values.c (RETURN_VALUE_ON_STACK): Delete default definition.

gdb/arch-utils.c

@@ -97,6 +97,12 @@ generic_frameless_function_invocation_not (struct frame_info *fi)
   return 0;
 }
 
+int
+generic_return_value_on_stack_not (struct type *type)
+{
+  return 0;
+}
+
 char *
 legacy_register_name (int i)
 {

gdb/arch-utils.h

@@ -39,6 +39,11 @@ extern gdbarch_breakpoint_from_pc_ftype legacy_breakpoint_from_pc;
 /* Frameless functions not identifable. */
 extern gdbarch_frameless_function_invocation_ftype generic_frameless_function_invocation_not;
 
+/* Only structures, unions, and arrays are returned using the struct
+   convention.  Note that arrays are never passed by value in the C
+   language family, so that case is irrelevant for C.  */
+extern gdbarch_return_value_on_stack_ftype generic_return_value_on_stack_not;
+
 /* Map onto old REGISTER_NAMES. */
 extern char *legacy_register_name (int i);
 

gdb/gdbarch.c

@@ -178,6 +178,7 @@ struct gdbarch
   gdbarch_register_convert_to_raw_ftype *register_convert_to_raw;
   gdbarch_pointer_to_address_ftype *pointer_to_address;
   gdbarch_address_to_pointer_ftype *address_to_pointer;
+  gdbarch_return_value_on_stack_ftype *return_value_on_stack;
   gdbarch_extract_return_value_ftype *extract_return_value;
   gdbarch_push_arguments_ftype *push_arguments;
   gdbarch_push_dummy_frame_ftype *push_dummy_frame;
@@ -315,6 +316,7 @@ struct gdbarch startup_gdbarch = {
   0,
   0,
   0,
+  0,
   /* startup_gdbarch() */
 };
 struct gdbarch *current_gdbarch = &startup_gdbarch;
@@ -360,6 +362,7 @@ gdbarch_alloc (const struct gdbarch_info *info,
   gdbarch->register_convertible = generic_register_convertible_not;
   gdbarch->pointer_to_address = generic_pointer_to_address;
   gdbarch->address_to_pointer = generic_address_to_pointer;
+  gdbarch->return_value_on_stack = generic_return_value_on_stack_not;
   gdbarch->breakpoint_from_pc = legacy_breakpoint_from_pc;
   gdbarch->memory_insert_breakpoint = default_memory_insert_breakpoint;
   gdbarch->memory_remove_breakpoint = default_memory_remove_breakpoint;
@@ -529,6 +532,7 @@ verify_gdbarch (struct gdbarch *gdbarch)
   /* Skip verify of register_convert_to_raw, invalid_p == 0 */
   /* Skip verify of pointer_to_address, invalid_p == 0 */
   /* Skip verify of address_to_pointer, invalid_p == 0 */
+  /* Skip verify of return_value_on_stack, invalid_p == 0 */
   if ((GDB_MULTI_ARCH >= 2)
       && (gdbarch->extract_return_value == 0))
     internal_error ("gdbarch: verify_gdbarch: extract_return_value invalid");
@@ -817,6 +821,10 @@ gdbarch_dump (void)
                       "gdbarch_update: ADDRESS_TO_POINTER = 0x%08lx\n",
                       (long) current_gdbarch->address_to_pointer
                       /*ADDRESS_TO_POINTER ()*/);
+  fprintf_unfiltered (gdb_stdlog,
+                      "gdbarch_update: RETURN_VALUE_ON_STACK = 0x%08lx\n",
+                      (long) current_gdbarch->return_value_on_stack
+                      /*RETURN_VALUE_ON_STACK ()*/);
   fprintf_unfiltered (gdb_stdlog,
                       "gdbarch_update: EXTRACT_RETURN_VALUE = 0x%08lx\n",
                       (long) current_gdbarch->extract_return_value
@@ -1866,6 +1874,25 @@ set_gdbarch_address_to_pointer (struct gdbarch *gdbarch,
   gdbarch->address_to_pointer = address_to_pointer;
 }
 
+int
+gdbarch_return_value_on_stack (struct gdbarch *gdbarch, struct type *type)
+{
+  if (GDB_MULTI_ARCH == 0)
+    return generic_return_value_on_stack_not (type);
+  if (gdbarch->return_value_on_stack == 0)
+    internal_error ("gdbarch: gdbarch_return_value_on_stack invalid");
+  if (gdbarch_debug >= 2)
+    fprintf_unfiltered (gdb_stdlog, "gdbarch_return_value_on_stack called\n");
+  return gdbarch->return_value_on_stack (type);
+}
+
+void
+set_gdbarch_return_value_on_stack (struct gdbarch *gdbarch,
+                                   gdbarch_return_value_on_stack_ftype return_value_on_stack)
+{
+  gdbarch->return_value_on_stack = return_value_on_stack;
+}
+
 void
 gdbarch_extract_return_value (struct gdbarch *gdbarch, struct type *type, char *regbuf, char *valbuf)
 {

gdb/gdbarch.h

@@ -510,6 +510,13 @@ extern void set_gdbarch_address_to_pointer (struct gdbarch *gdbarch, gdbarch_add
 #define ADDRESS_TO_POINTER(type, buf, addr) (gdbarch_address_to_pointer (current_gdbarch, type, buf, addr))
 #endif
 
+typedef int (gdbarch_return_value_on_stack_ftype) (struct type *type);
+extern int gdbarch_return_value_on_stack (struct gdbarch *gdbarch, struct type *type);
+extern void set_gdbarch_return_value_on_stack (struct gdbarch *gdbarch, gdbarch_return_value_on_stack_ftype *return_value_on_stack);
+#if (GDB_MULTI_ARCH > 1) || !defined (RETURN_VALUE_ON_STACK)
+#define RETURN_VALUE_ON_STACK(type) (gdbarch_return_value_on_stack (current_gdbarch, type))
+#endif
+
 typedef void (gdbarch_extract_return_value_ftype) (struct type *type, char *regbuf, char *valbuf);
 extern void gdbarch_extract_return_value (struct gdbarch *gdbarch, struct type *type, char *regbuf, char *valbuf);
 extern void set_gdbarch_extract_return_value (struct gdbarch *gdbarch, gdbarch_extract_return_value_ftype *extract_return_value);

gdb/gdbarch.sh

@@ -241,6 +241,7 @@ f:2:REGISTER_CONVERT_TO_RAW:void:register_convert_to_raw:struct type *type, int
 f:2:POINTER_TO_ADDRESS:CORE_ADDR:pointer_to_address:struct type *type, char *buf:type, buf:::generic_pointer_to_address:0
 f:2:ADDRESS_TO_POINTER:void:address_to_pointer:struct type *type, char *buf, CORE_ADDR addr:type, buf, addr:::generic_address_to_pointer:0
 #
+f:2:RETURN_VALUE_ON_STACK:int:return_value_on_stack:struct type *type:type:::generic_return_value_on_stack_not:0
 f:2:EXTRACT_RETURN_VALUE:void:extract_return_value:struct type *type, char *regbuf, char *valbuf:type, regbuf, valbuf::0:0
 f:1:PUSH_ARGUMENTS:CORE_ADDR:push_arguments:int nargs, struct value **args, CORE_ADDR sp, int struct_return, CORE_ADDR struct_addr:nargs, args, sp, struct_return, struct_addr::0:0
 f:2:PUSH_DUMMY_FRAME:void:push_dummy_frame:void:-:::0

gdb/values.c

@@ -1561,13 +1561,6 @@ generic_use_struct_convention (gcc_p, value_type)
 #define USE_STRUCT_CONVENTION(gcc_p,type) generic_use_struct_convention (gcc_p, type)
 #endif
 
-/* Some fundamental types (such as long double) are returned on the stack for
-   certain architectures.  This macro should return true for any type besides
-   struct, union or array that gets returned on the stack.  */
-
-#ifndef RETURN_VALUE_ON_STACK
-#define RETURN_VALUE_ON_STACK(TYPE) 0
-#endif
 
 /* Return true if the function specified is using the structure returning
    convention on this machine to return arguments, or 0 if it is using