[Xen-devel] Odgovor: ARM bare metal application test

[Ivan Pavić2 <Ivan.Pavic2@xxxxxx>]

Konrad Rzeszutek Wilk wrote:

> OK, but that makes an ELF file. I believe (based on the Booting) you need to 
> extract
> the binary code out and also fixup the branch instructions (maybe make 
> __Start = 0;?).

> The Booting says:

> - The boot loader is expected to call the kernel image by jumping
> directly to the first instruction of the kernel image.

> So if it is ELF it will jump in the ELF header, not the cod

Ok,

this is objdump -h app.elf

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000034  80008000  80008000  00008000  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .ARM.attributes 0000001f  00000000  00000000  00008034  2**0
                  CONTENTS, READONLY

I extracted binary with objcopy and used it to start domain:
Segment of output of: xl -vvv create dom.cfg

...
domainbuilder: detail: xc_dom_find_loader: trying Linux zImage (ARM32) loader 
... 
domainbuilder: detail: loader probe OK
domainbuilder: detail: xc_dom_parse_zimage32_kernel: called
...
domainbuilder: detail: vcpu_arm32: called
domainbuilder: detail: Initial state CPSR 0x1d3 PC 0x80008000
...

Only thing I can think of is that I'm accessing memory I can't access by 
default of MMU and that causes
prefetch abort but I don't know which memory segment I can use?

Regards, 
Ivan Pavic.



 



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