Copy the characters in str to the object file. You may specify more than one string to copy, separated by commas. Unless otherwise specified for a particular machine, the assembler marks the end of each string with a 0 byte. You can use any of the escape sequences described in Strings.
string64 differ from
string pseudo opcode in that each 8-bit character from str is
copied and expanded to 16, 32 or 64 bits respectively. The expanded characters
are stored in target endianness byte order.
.string32 "BYE" expands to: .string "B\0\0\0Y\0\0\0E\0\0\0" /* On little endian targets. */ .string "\0\0\0B\0\0\0Y\0\0\0E" /* On big endian targets. */