[Crash-utility] arm64 big endian support

[Dave Anderson]

----- Original Message -----
> On Fri, Apr 28, 2017 at 09:05:07AM -0400, Dave Anderson wrote:
> > 
> > > Hello,
> > > 
> > > Is there arm64 big endian support in crash utility? And when it appears?
> > > 
> > > Best regards,
> > > Denys
> > > 
> > 
> > What happens when you rebuild the crash package from scratch on a
> > big-endian arm64 host?
> 
> I gave it a spin with my kdump patch on ARM's fast model.
> 
> * Crash utility can compile natively.
> * Kdump works, of course, and crash seems to cope with vmcore correctly
>   as follows:

Hi Takahiro,

Thanks for the info, I appreciate your verifying that.

But on a much larger scale, thanks so much for your timeless efforts and
dogged persistence in getting arm64 kdump accepted upstream.  Truly an 
impressive accomplishment!

Thanks,
  Dave
  
  

> 
> ===8<===
> sys
>       KERNEL: ./vmlinux.0511
>     DUMPFILE: vmcore.0511
>         CPUS: 8
>         DATE: Thu May 11 00:29:29 2017
>       UPTIME: 00:04:23
> LOAD AVERAGE: 0.10, 0.07, 0.02
>        TASKS: 109
>     NODENAME: 192.168.10.11
>      RELEASE: 4.11.0-rc3-00041-g9cb987c300d2
>      VERSION: #6 SMP PREEMPT Thu May 11 09:16:54 JST 2017
>      MACHINE: aarch64_be  (unknown Mhz)
>       MEMORY: 512 MB
>        PANIC: "sysrq: SysRq : Trigger a crash"
> bt
> PID: 1      TASK: ffff80000d900000  CPU: 2   COMMAND: "bash"
>  #0 [ffff80000d8f7a30] crash_kexec at ffff000008143e1c
>  #1 [ffff80000d8f7a60] die at ffff00000808884c
>  #2 [ffff80000d8f7aa0] __do_kernel_fault at ffff00000809b5a8
>  #3 [ffff80000d8f7ad0] do_page_fault at ffff000008098628
>  #4 [ffff80000d8f7b40] do_translation_fault at ffff000008098718
>  #5 [ffff80000d8f7b50] do_mem_abort at ffff000008080aa4
>  #6 [ffff80000d8f7d30] el1_ia at ffff000008082600
>      PC: ffff00000850f7d8  [sysrq_handle_crash+32]
>      LR: ffff00000850f7c4  [sysrq_handle_crash+12]
>      SP: ffff80000d8f7d30  PSTATE: 60000145
>     X29: ffff80000d8f7d30  X28: ffff80000d900000  X27: ffff000008932000
>     X26: 0000000000000040  X25: 0000000000000123  X24: 0000000000000015
>     X23: 0000000000000000  X22: 0000000000000009  X21: ffff000008ebe810
>     X20: 0000000000000063  X19: ffff000008e31000  X18: 0000000000000010
>     X17: 0000ffffac312290  X16: ffff0000081fd378  X15: ffff000088f2c057
>     X14: 0000000000000006  X13: ffff000008f2c065  X12: ffff000008e31dc0
>     X11: ffff000008e31000  X10: 0000000005f5e0ff   X9: ffff80000d8f7a40
>      X8: 79735271203a2054   X7: ffff000008530ed0   X6: 00000000000000f7
>      X5: 0000000000000000   X4: 0000000000000000   X3: ffffffffffffffff
>      X2: ffff000008e31df0   X1: 0000000000000000   X0: 0000000000000001
>  #7 [ffff80000d8f7d40] __handle_sysrq at ffff00000850fe60
>  #8 [ffff80000d8f7d80] write_sysrq_trigger at ffff0000085102e4
>  #9 [ffff80000d8f7da0] proc_reg_write at ffff000008262478
> #10 [ffff80000d8f7dc0] __vfs_write at ffff0000081fac20
> #11 [ffff80000d8f7e40] vfs_write at ffff0000081fbf34
> #12 [ffff80000d8f7e80] sys_write at ffff0000081fd3b8
> #13 [ffff80000d8f7ed0] el0_svc_naked at ffff000008082f2c
>      PC: 0000000000000001   LR: 0000ffffac366998   SP: 0000000020000000
>     X29: 0000ffffde54d1b0  X28: 0000ffffac315450  X27: 0000ffffde54d1b0
>     X26: 0000000013fc6850  X25: 0000000000000000  X24: 00000000004e3000
>     X23: 00000000004e6000  X22: 00000000004c5460  X21: 0000000000000002
>     X20: 0000000000000002  X19: 0000ffffac3ee488  X18: 0000000013fc55e0
>     X17: 0000000000000002  X16: 0000000000000000  X15: 0000ffffac312290
>     X14: 0000000000000000  X13: 0000000000000000  X12: 0000000000000000
>     X11: 0000000000000000  X10: 0000000000000000   X9: 0000000000000020
>      X8: 0000000000000001   X7: ffffffc8ffffff80   X6: 0000000000000040
>      X5: 0000000000000063   X4: 0000000000000063   X3: 0000000000000001
>      X2: 00000000fbad2a84   X1: 0000000000000000   X0: 0000000000000002
>     ORIG_X0: 0000000000000000  SYSCALLNO: 0  PSTATE: 00000040
> ===>8===
> 
> -Takahiro AKASHI
> 
> > Dave
> > 
> > --
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