On 4/9/2023 4:50 pm, zhengxiaojun wrote:
>
>
> 在 2023/8/31 13:39, Chris Johns 写道:
>> On 31/8/2023 3:12 pm, zhengxiaojun wrote:
>>>
>>>
>>> 在 2023/8/31 6:05, Chris Johns 写道:
On 31/8/2023 12:48 am, zhengxiaojun wrote:
> Hi,
> I use the latest rtems-tools to generate RAP file, I found the object
> file
> become too small(elf,2184bytes==>rap,736bytes) and the file loaded failed,
> error
> message like this "load app.out error:offset past end of file: offset=736
> size=736 error."
What arch and BSP?
> I reverted the rtl-rap.cpp commit(
> 0ad4aaafc20afcb5aacb7a82b0b3a8150b638975
> linker/rap: Ignore relocation records with no section), the rap file can
> be
> loaded.
I think the commit has the wrong ticket id, it should be 4069 ...
https://devel.rtems.org/ticket/4069
My guess is the length includes the relocs that have been dropped because
they
do not have a symbol section. A reloc without a symbol section cannot be
located
because you do not know the section to locate it against.
Are you able to review the rtems-ld code for the issue?
>>> I found something suspicious, get_relocations(s) return all the count of
>>> relocation and write to rap file, but actual count is less, because ignore
>>> the
>>> reloc with section=0.
>>
>> Right, this aligns with my guess. That value should the number written out
>> and
>> it should not assume all are written.
>>
>>> This issue is similar to ticket #4781, maybe the same.
>>
>> Yeah it could. It would be nice if it is.
>>
>>> reduce count or write all relocs in rap ? I do not know which is the right
>>> solution.
>>
>> I am not sure. If relocs are needed then we have to have them and the patch
>> you
>> isolated is wrong or needs more understanding to know why it is there. I
>> suspect
>> an arch had an issue and this was the solution but that is guess on my part.
>
> I tried to make the length fit the relocs write to rap file, the file can not
> be
> loaded, it crashed. So the relocs(reloc.symsect == 0) can not be ignored, at
> least in arm.
Can you please open a ticket and can you please add the code to build into the
RAP with the commands you are using? A script would help.
> In addition, I saw a loader complaint "rtl: unsupported section:..." about
> .ARM.attributes， the arm linkcmds always keep it.
> Should it be dealt with?
The RTL may need to be taught to ignore the section.
Chris
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