>> I notice that a 32 bit process running on a 64 bit kernel is expected to >> know that it should fill in mips64_watch_regs --- even though it is running >> against a 32 bit ABI. >> >> Is this an oversight, or am I missing something ? > > It is intentional. Oh I see ... I have to call PTRACE_SET_WATCH_REGS first in order to figure out whether the kernel is expecting me to use pt_watch_style_mips32 or pt_watch_style_mips64. Thanks. Earl