• Ian Munsie's avatar
    powerpc/ftrace: Implement raw syscall tracepoints on PowerPC · 02424d89
    Ian Munsie authored
    This patch implements the raw syscall tracepoints on PowerPC and exports
    them for ftrace syscalls to use.
    
    To minimise reworking existing code, I slightly re-ordered the thread
    info flags such that the new TIF_SYSCALL_TRACEPOINT bit would still fit
    within the 16 bits of the andi. instruction's UI field. The instructions
    in question are in /arch/powerpc/kernel/entry_{32,64}.S to and the
    _TIF_SYSCALL_T_OR_A with the thread flags to see if system call tracing
    is enabled.
    
    In the case of 64bit PowerPC, arch_syscall_addr and
    arch_syscall_match_sym_name are overridden to allow ftrace syscalls to
    work given the unusual system call table structure and symbol names that
    start with a period.
    Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    02424d89
Makefile 5.42 KB