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    SubjectRe: [PATCH 1/4] kgdb: x86: Return all segment registers also in 64-bit mode
    On 03/16/2012 07:17 AM, Jan Kiszka wrote:
    > Even if the content is always 0, gdb expects us to return also ds,
    > es, fs, and gs while in x86-64 mode. Do this to avoid ugly errors on
    > "info registers".
    >
    > Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
    > ---
    > arch/x86/include/asm/kgdb.h | 6 +++++-
    > arch/x86/kernel/kgdb.c | 6 ++++--
    > 2 files changed, 9 insertions(+), 3 deletions(-)
    >
    > diff --git a/arch/x86/include/asm/kgdb.h b/arch/x86/include/asm/kgdb.h
    > index 77e95f5..e857f1a 100644
    > --- a/arch/x86/include/asm/kgdb.h
    > +++ b/arch/x86/include/asm/kgdb.h
    > @@ -64,9 +64,13 @@ enum regnames {
    > GDB_PS, /* 17 */
    > GDB_CS, /* 18 */
    > GDB_SS, /* 19 */
    > + GDB_DS, /* 20 */
    > + GDB_ES, /* 21 */
    > + GDB_FS, /* 22 */
    > + GDB_GS, /* 23 */
    > };
    > #define GDB_ORIG_AX 57
    > -#define DBG_MAX_REG_NUM 20
    > +#define DBG_MAX_REG_NUM 24
    > /* 17 64 bit regs and 3 32 bit regs */
    > #define NUMREGBYTES ((17 * 8) + (3 * 4))

    You bumped the register numbers correctly, but you also need to add the correct padding to the NUMREGBYTES or you might not get a large enough memory block for the register struct.

    You added 2 32 bit regs, so it should change to:

    /* 17 64 bit regs and 5 32 bit regs */
    #define NUMREGBYTES ((17 * 8) + (5 * 4))


    The rest should be fine. I can test this and add it to the merge queue with the NUMREGBYTES change, unless you disagree.

    Cheers,
    Jason.


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