From: Nick Clifton <nickc@redhat.com>
To: Sergei Organov <osv@topconrd.ru>
Cc: Pieter Arnout <pieter@powerescape.com>, binutils@sources.redhat.com
Subject: Re: HELP with linker script!!!
Date: Mon, 04 Apr 2005 13:39:00 -0000 [thread overview]
Message-ID: <425142CB.80107@redhat.com> (raw)
In-Reply-To: <8764z269eb.fsf@osv.topcon.com>
Hi Sergei,
> Well, please correct me if I'm wrong, but I see two problems here.
>
> 1. The variables should better be of type 'char', otherwise pointer
> arithmetic in the third parameter to memcpy() will bring wrong
> result.
>
> 2. Even then it could be wrong. For example, on PowerPC using SYSV ABI
> compiler is free to assume the two variables are in the small data
> section and may generate incorrect assembly and relocation types for
> the addresses, I'm afraid. Because of this I'd use slightly different
> approach:
>
> extern char __start_of_cacheable_bss[];
> extern char __end_of_cacheable_bss[];
>
> memset (__start_of_cacheable_bss, 0,
> __end_of_cacheable_bss - __start_of_cacheable_bss);
>
> The purpose of using arrays of unknown size is to prevent compiler
> from assuming anything about the location of the variables.
Good points - thanks for making them.
Cheers
Nick
next prev parent reply other threads:[~2005-04-04 13:39 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-31 14:42 Pieter Arnout
2005-03-31 15:50 ` Nick Clifton
[not found] ` <29c1ff0410ff9cc2b88a3ad82d1938aa@powerescape.com>
2005-04-01 11:27 ` Nick Clifton
2005-04-01 12:53 ` Vincent Rubiolo
2005-04-01 14:05 ` Nick Clifton
2005-04-01 14:13 ` Dave Korn
2005-04-01 14:34 ` Andreas Schwab
2005-04-01 16:53 ` Pieter Arnout
2005-04-04 9:39 ` Vincent Rubiolo
2005-04-04 11:06 ` Nick Clifton
2005-04-04 11:11 ` Dave Korn
2005-04-04 11:59 ` Sergei Organov
2005-04-04 13:39 ` Nick Clifton [this message]
2005-03-31 15:08 Zagorodnev, Grigory
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