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Re: [avr-gcc-list] avr-objcopy not copying custom section...

From: Boyapati, Anitha
Subject: Re: [avr-gcc-list] avr-objcopy not copying custom section...
Date: Thu, 26 May 2011 01:09:35 +0800

>-----Original Message-----
>From: address@hidden
>[mailto:address@hidden On
>Behalf Of Boyapati, Anitha
>Sent: Wednesday, May 25, 2011 10:34 PM
>To: address@hidden; address@hidden
>Subject: Re: [avr-gcc-list] avr-objcopy not copying custom section...
>>> Yes. That is where the confusion stemmed from.
>>Hi Anitha,
>>Last time, I didn't look exhaustively for flags in the ELF format. With
>>the aid of "readelf -e test.elf", we can see that there are more section
>>flags in the section header:
>>Key to Flags:
>>  W (write), A (alloc), X (execute), M (merge), S (strings)
>>  I (info), L (link order), G (group), x (unknown)
>>  O (extra OS processing required) o (OS specific), p (processor specific)
>>I overlooked that before. In the sh_flags member of the Shdr struct, the
>>ELF format does have separate explicit alloc and execute flags.
>I did not :-)
>Initially I referred to the age old System V ABI spec for reference which
>still had R, W and X flags. However the ELF dump showed more (as you have
>mentioned below).
>>> 'objdump' program works on BFD structures. The set of BFD section
>>> flags for a super set to ELF section flags. So, the dump of section
>>> headers shows BFD flags but not ELF flags.
>What made me mention the BFD flags is w.r.t 'CONTENTS' and 'LOAD'. These do
>not appear in ELF spec as section attributes. So I think objdump is just
>dumping ELF+ extra BFD attributes.

Oops, typo. Please read attributes as flags.


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