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    Subject[PATCH 1/4] kgdb: x86: Return all segment registers also in 64-bit mode
    Date
    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))
    #endif /* ! CONFIG_X86_32 */
    diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
    index faba577..fdc37b3 100644
    --- a/arch/x86/kernel/kgdb.c
    +++ b/arch/x86/kernel/kgdb.c
    @@ -67,8 +67,6 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
    { "ss", 4, offsetof(struct pt_regs, ss) },
    { "ds", 4, offsetof(struct pt_regs, ds) },
    { "es", 4, offsetof(struct pt_regs, es) },
    - { "fs", 4, -1 },
    - { "gs", 4, -1 },
    #else
    { "ax", 8, offsetof(struct pt_regs, ax) },
    { "bx", 8, offsetof(struct pt_regs, bx) },
    @@ -90,7 +88,11 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
    { "flags", 4, offsetof(struct pt_regs, flags) },
    { "cs", 4, offsetof(struct pt_regs, cs) },
    { "ss", 4, offsetof(struct pt_regs, ss) },
    + { "ds", 4, -1 },
    + { "es", 4, -1 },
    #endif
    + { "fs", 4, -1 },
    + { "gs", 4, -1 },
    };

    int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
    --
    1.7.3.4


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