+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
+
+static enum return_value_convention
+avr_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *valtype, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
+ || TYPE_CODE (valtype) == TYPE_CODE_UNION
+ || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
+ && !(TYPE_LENGTH (valtype) == 1
+ || TYPE_LENGTH (valtype) == 2
+ || TYPE_LENGTH (valtype) == 4
+ || TYPE_LENGTH (valtype) == 8));
+
+ if (writebuf != NULL)
+ {
+ gdb_assert (!struct_return);
+ error (_("Cannot store return value."));
+ }
+
+ if (readbuf != NULL)
+ {
+ gdb_assert (!struct_return);
+ avr_extract_return_value (valtype, regcache, readbuf);
+ }
+
+ if (struct_return)
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ else
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+