[uClinux-dev] Memory problem with arm-nommu /?Clinux

David McCullough davidm at snapgear.com
Wed Oct 12 17:23:10 EDT 2005


Jivin Baptiste Decroix lays it down ...
> Hi
> 
> I've been working for a few months to make Wonka (an open-source JVM)
> run on an arm-based board, with no mmu and running ?Clinux.
> I've been able to cross-compile Wonka successfully for my platform but
> when I try to run a simple application, all I got is a memory error.
> 
> I wonder if the problem come from wonka or from ?Clinux, as the error
> happen just after the system call start_thread(...).
> I switch on the DEBUG in binfmt_flat.c and change the flags in the
> executable to have more informations on what happened:
> 
> # arm-elf-flthdr wonka
> wonka
>     Magic:        bFLT
>     Rev:          4
>     Entry:        0x50
>     Data Start:   0x87640
>     Data End:     0xa3800
>     BSS End:      0xa9730
>     Stack Size:   0x2000
>     Reloc Start:  0xa3800
>     Reloc Count:  0xa7b
>     Flags:        0x13 ( Load-to-Ram Has-PIC-GOT )
> 
> When I run the application, I have this output:
> 
> # ./wonka Hello
> BINFMT_FLAT: Loading file: ./wonka
> Mapping is 435000, Entry point is 50, data_start is 87640
> Load ./wonka: TEXT=435040-4bc640 DATA=4bc644-4d8804 BSS=4d8804-4de734
> p=4e0ffc
> start_thread(regs=0x3f45fb8, entry=0x435050, start_stack=0x4e0f70)
> fault-common.c 243
> Bus error
> 
> printf in the wonka main() don't even show.
> I've seen that fault-common.c is a memory error but I can't tell from
> where it comes.
> 
> Does anyone see something that I made obviously wrong?
> How can I get an idea of the appropriate size to use for the stack?

Start big :-)

64-128K or more if you think the app is using a lot,

Cheers,
Davidm

-- 
David McCullough, davidm at cyberguard.com.au, Custom Embedded Solutions + Security
Ph:+61 734352815 Fx:+61 738913630 http://www.uCdot.org http://www.cyberguard.com



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