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    Subject[PATCH] Add prctl to change endian of a task

    Add a prctl to change a tasks endian. While we only have powerpc code to
    implement this so far, it seems like something that warrants a generic
    interface (like setting floating point mode bits).

    Signed-off-by: Anton Blanchard <anton@samba.org>
    ---

    Index: build/kernel/sys.c
    ===================================================================
    --- build.orig/kernel/sys.c 2006-04-02 08:11:40.000000000 +1000
    +++ build/kernel/sys.c 2006-04-02 08:13:13.000000000 +1000
    @@ -57,6 +57,12 @@
    #ifndef GET_FPEXC_CTL
    # define GET_FPEXC_CTL(a,b) (-EINVAL)
    #endif
    +#ifndef GET_ENDIAN
    +# define GET_ENDIAN(a,b) (-EINVAL)
    +#endif
    +#ifndef SET_ENDIAN
    +# define SET_ENDIAN(a,b) (-EINVAL)
    +#endif

    /*
    * this is where the system-wide overflow UID and GID are defined, for
    @@ -2057,6 +2063,13 @@ asmlinkage long sys_prctl(int option, un
    return -EFAULT;
    return 0;
    }
    + case PR_GET_ENDIAN:
    + error = GET_ENDIAN(current, arg2);
    + break;
    + case PR_SET_ENDIAN:
    + error = SET_ENDIAN(current, arg2);
    + break;
    +
    default:
    error = -EINVAL;
    break;
    Index: build/include/linux/prctl.h
    ===================================================================
    --- build.orig/include/linux/prctl.h 2006-04-02 08:11:40.000000000 +1000
    +++ build/include/linux/prctl.h 2006-04-02 08:13:13.000000000 +1000
    @@ -52,4 +52,10 @@
    #define PR_SET_NAME 15 /* Set process name */
    #define PR_GET_NAME 16 /* Get process name */

    +/* Get/set process endian */
    +#define PR_GET_ENDIAN 19
    +#define PR_SET_ENDIAN 20
    +# define PR_ENDIAN_BIG 0
    +# define PR_ENDIAN_LITTLE 1
    +
    #endif /* _LINUX_PRCTL_H */
    -
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