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    SubjectRe: [PATCH] stack2core: show stack message and convert it to core file when kernel die
    On Sun, Jan 03, 2010 at 11:05:05PM +0800, Hui Zhu wrote:
    > Hello,
    >
    > For, when the kernel die, the user will get some message like:
    > PC is at kernel_init+0xd4/0x104
    > LR is at _atomic_dec_and_lock+0x48/0x6c
    > pc : [<c0008470>] lr : [<c01911f8>] psr: 60000013
    > sp : c7823fd8 ip : c7823f48 fp : c7823ff4
    > Stack: (0xc7823fd8 to 0xc7824000)
    > 3fc0: 00000000 00000001
    > Backtrace:
    > [<c000839c>] (kernel_init+0x0/0x104) from [<c0042660>] (do_exit+0x0/0x880)
    > This backtrace have some wrong message sometime and cannot get any
    > val. Of course, kdump can get more message. But it need do some a lot
    > of other config.

    If you have frame pointers enabled, the backtrace is _never_ wrong.
    It only goes wrong if you disable frame pointers, at which point the
    unwind tables have to be used.

    > When kernel die, show some message:
    > S2C:elf_class=1
    > S2C:elf_data=1
    > S2C:elf_arch=40
    > S2C:elf_osabi=0
    > S2C:r0=0x00000000;
    > S2C:r1=0xc7822000;
    > S2C:r2=0xc7823f48;
    > S2C:r3=0x00000003;
    > S2C:r4=0x00000000;
    > S2C:r5=0x00000000;
    > S2C:r6=0x00000000;
    > S2C:r7=0x00000000;
    > S2C:r8=0x00000000;
    > S2C:r9=0x00000000;
    > S2C:r10=0x00000000;
    > S2C:fp=0xc7823ff4;
    > S2C:ip=0xc7823f48;
    > S2C:sp=0xc7823fd8;
    > S2C:lr=0xc01911f8;
    > S2C:pc=0xc0008470;
    > S2C:cpsr=0x60000013;
    > S2C:ORIG_r0=0xffffffff;
    >
    > S2C:stack=0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
    > S2C:stack=0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    > S2C:stack=0x00, 0x00, 0x00, 0x00, 0xf8, 0x3f, 0x82, 0xc7,
    > S2C:stack=0x60, 0x26, 0x04, 0xc0, 0xa8, 0x83, 0x00, 0xc0,
    > S2C:stack=0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

    Please don't invent yet another way of dumping stuff out of the kernel.
    What we already have is sufficient for your needs - there's no reason
    what so ever to change it to achieve your goals. We already dump the
    registers and the stack, which seems to be all that you require.


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