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Re: Data Access Exception when trying to Boot installed NetBSD of hard drive
On Mon, 13 Oct 2014, Adrian Christiansen wrote:
> Hi Eduardo!
>
> I see, thought this would be the case too.
>
> Here's the output of those two if it would help anyone:
>
> ok .s
> Empty
>
> ok ctrace
> PC: ffe9a430
> Last leaf: call ffe9985c from ffea5da4
> 0 w %o0-%o5: ( 1 38786f 1 ffd40000 ffefffbf ffe8ef04 )
>
> jmpl ffea794c from 388e7c
> 1 w %o0-%o5: ( ffefb8a0 0 2000 ffd40000 ff 66 )
>
> jmpl ffea794c from 388180
> 2 w %o0-%o5: ( 0 0 2000 0 0 0 )
>
> jmpl ffea794c from 38d1c4
> 3 w %o0-%o5: ( 398c60 1 0 10 2000 398e50 )
>
> jmpl ffea794c from 391924
> 4 w %o0-%o5: ( 387ee8 398bd8 398400 387df4 387e44 0 )
>
> call 391818 from 39113c
> 5 w %o0-%o5: ( 387ee8 1 387ecc 1f fff7fffc ffea6fd8 )
>
> call 391134 from 38a898
> 6 w %o0-%o5: ( 387ee8 0 396dc8 ffffddbb ffeffd7f 0 )
>
> call 38a4f0 from 38811c
> 7 w %o0-%o5: ( 3960f0 396120 396178 384000 2000 ffffc000 )
>
> jmpl ffea794c from 300c40
> 8 w %o0-%o5: ( ffe8f3c8 388000 2fff9c ffd40000 ffefffbf ffe8ef04 )
>
> call 300b64 from 30011c
> 9 w %o0-%o5: ( ffe8f3c8 301c00 0 ffd40000 ff fffffff )
>
> XXXXXXX from 0
> a w %o0-%o5: ( ffe8f3c8 300000 0 0 0 0 )
>
> That looks even less helpful, is there a way to find some declarations
> or labels for those addresses?
What you need to do is run objdump or gcc on the two bootloader binaries
to get the code and data addresses. Then just correlate them with the
values from the stack.
Assuming the firmware is dumping the correct values, the first value you
see is the instruction being used, either call or jump and link, followed
by the branch destination, and I think the next field is the address of
the calling instruction itself. You also have the first 5 function
parameters.
OBP resides at address 0xff000000. The stuff at 0x380000 and 0x300000 are
probably the bootloaders.
OBP 3.x has mechanisms to load symbols, something I'm not sure 2.x
supports.
(Another option would be to see if the sparc64 FCode bootblock can be made
to run on OBP 2.x. That's capable of walking the filesystem in 7.5KB,
instead of having a list of absolute disk blocks to read.)
Eduardo
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