/* gcc_p unused */
static int
mn10300_use_struct_convention (int gcc_p, struct type *type)
{
/* Structures bigger than a pair of words can't be returned in
registers. */
if (TYPE_LENGTH (type) > 8)
return 1;
switch (TYPE_CODE (type))
{
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
/* Structures with a single field are handled as the field
itself. */
if (TYPE_NFIELDS (type) == 1)
return mn10300_use_struct_convention (gcc_p,
TYPE_FIELD_TYPE (type, 0));
/* Structures with word or double-word size are passed in memory, as
long as they require at least word alignment. */
if (mn10300_type_align (type) >= 4)
return 0;
return 1;
/* Arrays are addressable, so they're never returned in
registers. This condition can only hold when the array is
the only field of a struct or union. */
case TYPE_CODE_ARRAY:
return 1;
case TYPE_CODE_TYPEDEF:
return mn10300_use_struct_convention (gcc_p, check_typedef (type));
default:
return 0;
}
}
static enum return_value_convention
mn10300_return_value (struct gdbarch *gdbarch, struct type *type,
struct regcache *regcache, gdb_byte *readbuf,
const gdb_byte *writebuf)
{
if (mn10300_use_struct_convention (type))
return RETURN_VALUE_STRUCT_CONVENTION;
if (readbuf)
mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
if (writebuf)
mn10300_store_return_value (gdbarch, type, regcache, writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}