Eric Lee / smarc-fsl-linux-kernel

18 Jul, 2008

1 commit

  • 09d3e1baa   sparc: copy exported sparc64 specific header files to asm-sparc ... Browse Code »

    Copy was done using the following simple script:

    set -e
    SPARC64="h display7seg.h envctrl.h psrcompat.h pstate.h uctx.h utrap.h watchdog.h"
    for FILE in ${SPARC64}; do
    if [ -f asm-sparc/$FILE ]; then
    echo $FILE exist in asm-sparc
    fi
    cat asm-sparc64/$FILE > asm-sparc/$FILE
    printf "#include \n" > asm-sparc64/$FILE
    done

    The name of the copied files are added to asm-sparc/Kbuild
    to keep "make headers_check" functional.

    Signed-off-by: Sam Ravnborg

    Sam Ravnborg
     

20 May, 2008

1 commit

11 May, 2008

1 commit

  • 28e610366   sparc: Fix debugger syscall restart interactions. ... Browse Code »

    So, forever, we've had this ptrace_signal_deliver implementation
    which tries to handle all of the nasties that can occur when the
    debugger looks at a process about to take a signal. It's meant
    to address all of these issues inside of the kernel so that the
    debugger need not be mindful of such things.

    Problem is, this doesn't work.

    The idea was that we should do the syscall restart business first, so
    that the debugger captures that state. Otherwise, if the debugger for
    example saves the child's state, makes the child execute something
    else, then restores the saved state, we won't handle the syscall
    restart properly because we lose the "we're in a syscall" state.

    The code here worked for most cases, but if the debugger actually
    passes the signal through to the child unaltered, it's possible that
    we would do a syscall restart when we shouldn't have.

    In particular this breaks the case of debugging a process under a gdb
    which is being debugged by yet another gdb. gdb uses sigsuspend
    to wait for SIGCHLD of the inferior, but if gdb itself is being
    debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
    does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
    signal. But ptrace_signal_deliver() assumed the debugger would cancel
    out the signal and therefore did a syscall restart, because the return
    error was ERESTARTNOHAND.

    Fix this by simply making ptrace_signal_deliver() a nop, and providing
    a way for the debugger to control system call restarting properly:

    1) Report a "in syscall" software bit in regs->{tstate,psr}.
    It is set early on in trap entry to a system call and is fully
    visible to the debugger via ptrace() and regsets.

    2) Test this bit right before doing a syscall restart. We have
    to do a final recheck right after get_signal_to_deliver() in
    case the debugger cleared the bit during ptrace_stop().

    3) Clear the bit in trap return so we don't accidently try to set
    that bit in the real register.

    As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
    like sparc64 has.

    M68K has this same exact bug, and is now the only other user of the
    ptrace_signal_deliver hook. It needs to be fixed in the same exact
    way as sparc.

    Signed-off-by: David S. Miller

    David S. Miller
     

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds