kernel debugger on cubietruck
Gilles DALMAS
gdalmas at wanadoo.fr
Sat Sep 20 13:32:53 UTC 2014
I did not know much about debug kernel, but when I pass the trace command, I get:
db> trace
Tracing pid 0 tid 100000 td 0xc08ba870
db_trace_self() at db_trace_self
pc = 0xc04eba6c lr = 0xc0232780 (db_hex2dec+0x4d8)
sp = 0xc08e5750 fp = 0xc08e5768
r10 = 0xc08ba1c4
db_hex2dec() at db_hex2dec+0x4d8
pc = 0xc0232780 lr = 0xc02320f0 (db_command_loop+0x2fc)
sp = 0xc08e5770 fp = 0xc08e5810
r4 = 0x00000000 r5 = 0x00000000
r6 = 0x00000063
db_command_loop() at db_command_loop+0x2fc
pc = 0xc02320f0 lr = 0xc0231e54 (db_command_loop+0x60)
sp = 0xc08e5818 fp = 0xc08e5828
r4 = 0xc0528609 r5 = 0xc0540c1c
r6 = 0xc08ba1b0 r7 = 0xc08e5a48
r8 = 0x00000001 r9 = 0xc05d2918
r10 = 0xc0615aa4
db_command_loop() at db_command_loop+0x60
pc = 0xc0231e54 lr = 0xc023481c (X_db_symbol_values+0x250)
sp = 0xc08e5830 fp = 0xc08e5950
r4 = 0x00000000 r5 = 0xc08ba1bc
r6 = 0xc0615ac8
X_db_symbol_values() at X_db_symbol_values+0x250
pc = 0xc023481c lr = 0xc0352c88 (kdb_trap+0x15c)
sp = 0xc08e5958 fp = 0xc08e5978
r4 = 0x00000000 r5 = 0x00000005
r6 = 0xc0615ac8 r7 = 0xc08e5a48
kdb_trap() at kdb_trap+0x15c
pc = 0xc0352c88 lr = 0xc050138c (data_abort_handler+0x680)
sp = 0xc08e5980 fp = 0xc08e5998
r4 = 0xc08e5a48 r5 = 0x00000005
r6 = 0x600001d3 r7 = 0x00000000
r8 = 0x00000013 r9 = 0xc08e5a48
r10 = 0x00000001
data_abort_handler() at data_abort_handler+0x680
pc = 0xc050138c lr = 0xc0501134 (data_abort_handler+0x428)
sp = 0xc08e59a0 fp = 0xc08e5a40
r4 = 0xc08e5eb0 r5 = 0xc08ba870
r6 = 0xc08ba548 r7 = 0x00000005
data_abort_handler() at data_abort_handler+0x428
pc = 0xc0501134 lr = 0xc04ed754 (exception_exit)
sp = 0xc08e5a48 fp = 0xc08e5ab0
r4 = 0xc3b49f00 r5 = 0xc3b4a080
r6 = 0xc3b4a0b8 r7 = 0x00000000
r8 = 0xc056b038 r9 = 0xc3ae1700
r10 = 0xc05d4930
exception_exit() at exception_exit
pc = 0xc04ed754 lr = 0xc024e0f0 (mii_phy_flowstatus+0x2080)
sp = 0xc08e5a98 fp = 0xc08e5ab0
r0 = 0x00000000 r1 = 0xc0547c85
r2 = 0x00000072 r3 = 0x00000008
r4 = 0xc3b49f00 r5 = 0xc3b4a080
r6 = 0xc3b4a0b8 r7 = 0x00000000
r8 = 0xc056b038 r9 = 0xc3ae1700
r10 = 0xc05d4930 r12 = 0x00000000
strcmp() at strcmp+0x4
pc = 0xc03d7604 lr = 0xc024e0f0 (mii_phy_flowstatus+0x2080)
sp = 0xc08e5a98 fp = 0xc08e5ab0
Unwind failure (no registers changed)
> Message du 20/09/14 15:13
> De : "Boris Astardzhiev"
> A : "Gilles DALMAS"
> Copie à : freebsd-arm at freebsd.org
> Objet : Re: kernel debugger on cubietruck
>
>
> Hi,
> As far as I see strcmp() is passed a NULL pointer, try issuing a backtrace to get the exact place of calling.
> Regards
On Sep 20, 2014 4:11 PM, "Gilles DALMAS" wrote:
hi,
>
>
>
> I would compile freebsd for it run on a cubietruck. For this I used the wiki page: https://wiki.freebsd.org/FreeBSD/arm/Cubieboard using option confifuration "CUBIEBOARD2." everything goes well, but starting on the "truck", I get this message:
>
>
>
> vm_fault(0xc08bab80, 0, 1, 0) -> 1
> Fatal kernel mode data abort: 'Translation Fault (S)'
> trapframe: 0xc08e5a48
> FSR=00000005, FAR=00000000, spsr=a00001d3
> r0 =00000000, r1 =c0547c85, r2 =00000072, r3 =00000008
> r4 =c3b49f00, r5 =c3b4a080, r6 =c3b4a0b8, r7 =00000000
> r8 =c056b038, r9 =c3ae1700, r10=c05d4930, r11=c08e5ab0
> r12=00000000, ssp=c08e5a98, slr=c024e0f0, pc =c03d7604
>
> [ thread pid 0 tid 100000 ]
> Stopped at strcmp+0x4: ldrb r3, [r0]
>
>
>
> where is the problem please ?
>
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