Re: [Minios-devel] Test minios for the arm64

[Huang Shijie <shijie.huang@xxxxxxx>]

On Fri, Jun 09, 2017 at 11:57:33AM +0100, Julien Grall wrote:
> (CC correct e-mail for Stefano.)
> 
> On 09/06/17 10:52, Huang Shijie wrote:
> >Hi all,
> 
> Hi Shijie,
> 
> >   I tested the Volodymyr's git tree with arm64 platform (Softiron)
> >   The mini-os hang when it tried to enable the MMU.
> >
> >   The following is the log:
> >  --------------------------------------------------------
> >     (XEN) Freed 288kB init memory.
> >     - Mini-OS booting -
> >     - Setup CPU -
> >     - Setup booting pagetable -
> >     - Setup ID mapping -
> >     *** Sync exception at PC = ffffffc000001048 ***
> >     Thread state:
> >     X0  = 0x0000000000000000 X1  = 0x0000000034d5d905
> >     X2  = 0xffffffc000000800 X3  = 0x0000000000000100
> >     X4  = 0x000000800801f000 X5  = 0x0000008008022000
> >     X6  = 0x0000008008000000 X7  = 0x0000008008020003
> >     X8  = 0x0000000000000000 X9  = 0x0000000008008020
> >     X10 = 0x0000000000000000 X11 = 0x0000000000000000
> >     X12 = 0x0000000000000000 X13 = 0x0000000000000000
> >     X14 = 0x0000000000000000 X15 = 0x0000000000000000
> >     X16 = 0x00000000deadbeef X17 = 0x0000000000000000
> >     X18 = 0x0000008000000711 X19 = 0xffffffc000000800
> >     X20 = 0x000000800fe00000 X21 = 0xffffffc000400020
> >     X22 = 0xffffffc000000fc4 X23 = 0x00000000600003c5
> >     X24 = 0x0000000000000000 X25 = 0x0000000000000000
> >     X26 = 0x0000000000000000 X27 = 0x0000000000000000
> >     X28 = 0x0000000000000000 X29 = 0xffffffc000000800
> >     X30 (lr) = 0x00000080080001ac
> >     sp  = 0xffffffc0003fff10
> >     esr_el1 = 96000046
> 
> This is a data abort. I would when trying to access...
> 
> >     far_el1 = ffffffc000400000
> 
> this address. Have would recommend to look what is the instruction (and
> function) which generates the data abort.
This address (far_el1 = ffffffc000400000) is used for stack.

I guess that an exception nests in another exception.

The x22(0xffffffc000000fc4) (which is the older ELR_EL1) is the first exception,

In the trap_entry() code, the first "push" triggers the second exception.


Thanks
Huang Shijie

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