linux-kernel - Re: [PATCH 8/33] kallsyms.c: Generate relocatable symbols.

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Message-ID: <44CF3CCE.9010209@grupopie.com>
Date:	Tue, 01 Aug 2006 12:36:46 +0100
From:	Paulo Marques <pmarques@...popie.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	fastboot@...l.org, linux-kernel@...r.kernel.org,
	Horms <horms@...ge.net.au>,
	Jan Kratochvil <lace@...kratochvil.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Vivek Goyal <vgoyal@...ibm.com>, Linda Wang <lwang@...hat.com>
Subject: Re: [PATCH 8/33] kallsyms.c: Generate relocatable symbols.

Eric W. Biederman wrote:
> Print the addresses of non-absolute symbols relative to _text
> so that ld will generate relocations.  Allowing a relocatable
> kernel to relocate them.  We can't actually use the symbol names
> because kallsyms includes static symbols that are not exported
> from their object files.
> 
> [...]
>  	output_label("kallsyms_addresses");
>  	for (i = 0; i < table_cnt; i++) {
> -		printf("\tPTR\t%#llx\n", table[i].addr);
> +		if (toupper(table[i].sym[0]) != 'A') {
> +			printf("\tPTR\t_text + %#llx\n",
> +				table[i].addr - _text);
> +		} else {
> +			printf("\tPTR\t%#llx\n", table[i].addr);
> +		}

Doesn't this break kallsyms for almost everyone?

kallsyms addresses aren't used just for displaying, but also to find 
symbols from their addresses (from the stack trace, etc.).

Am I missing something?

-- 
Paulo Marques - www.grupopie.com

"The face of a child can say it all, especially the
mouth part of the face."
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