Eric Lee / smarc-ti-linux-kernel

18 Apr, 2013

1 commit

  • 517b73147   powerpc/ptrace: Add DAWR debug feature info for userspace ... Browse Code »

    This adds new debug feature information so that the DAWR can be
    identified by userspace tools like GDB.

    Unfortunately the DAWR doesn't sit nicely into the current description
    that ptrace provides to userspace via struct ppc_debug_info. It doesn't
    allow for specifying that only some ranges are possible or even the end
    alignment constraints (DAWR only allows 512 byte wide ranges which can't
    cross a 512 byte boundary).

    After talking to Edjunior Machado (GDB ppc developer), it was decided
    this was the best approach. Just mark it as debug feature DAWR and
    tools like GDB can internally decide the constraints.

    Signed-off-by: Michael Neuling
    Signed-off-by: Michael Ellerman

    Michael Neuling
     

29 Jan, 2013

1 commit

16 Jan, 2013

1 commit

  • 1715a826a   powerpc: Add DSCR support to ptrace ... Browse Code »

    The DSCR (aka Data Stream Control Register) is supported on some
    server PowerPC chips and allow some control over the prefetch
    of data streams.

    The kernel already supports DSCR value per thread but there is also
    a need in a ability to change it from an external process for
    the specific pid.

    The patch adds new register index PT_DSCR (index=44) which can be
    set/get by:
    ptrace(PTRACE_POKEUSER, traced_process, PT_DSCR << 3, dscr);
    dscr = ptrace(PTRACE_PEEKUSER, traced_process, PT_DSCR << 3, NULL);

    The patch does not increase PT_REGS_COUNT as the pt_regs struct has not
    been changed.

    Signed-off-by: Alexey Kardashevskiy
    Signed-off-by: Benjamin Herrenschmidt

    Alexey Kardashevskiy
     

09 Oct, 2012

1 commit