linux-kernel - Re: [PATCH 10/33] i386: Relocatable kernel support.

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Message-ID: <44CF9A64.7070204@kolumbus.fi>
Date:	Tue, 01 Aug 2006 21:16:04 +0300
From:	Mika Penttilä <mika.penttila@...umbus.fi>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	fastboot@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/33] i386: Relocatable kernel support.

Eric W. Biederman wrote:
> Mika Penttilä <mika.penttila@...umbus.fi> writes:
>
>   
>>> @@ -1,9 +1,10 @@
>>>  SECTIONS
>>>  {
>>> -  .data : { +  .data.compressed : {
>>>  	input_len = .;
>>>  	LONG(input_data_end - input_data) input_data = .;  	*(.data)
>>> +	output_len = . - 4;
>>>  	input_data_end = .;  	}
>>>  }
>>>
>>>       
>> I don't see how you are getting the uncompressed length from output_len...
>>     
>
> It's part of the gzip format.  It places the length at the end of
> the compressed data.  I am just computing the address of where gzip
> put the length and putting a variable there called output_len.
>
> Isn't linker script magic wonderful :)
>
> Eric
> -
>   
Huh, quite a nice trick indeed!

Thanks,
Mika

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