From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jens Gehrlein <sew_s@tqs.de>
Date: Wed, 25 Jun 2008 15:57:12 +0200
Subject: [U-Boot-Users] How to specify the starting function of aU-boot
 standalone application.
In-Reply-To: <1214401321.1418.27.camel@mcmullan-linux.cifs.lab.netapp.com>
References: <48616AED.50205@ruggedcom.com> <4861DB22.9090201@tqs.de>
	<1214401321.1418.27.camel@mcmullan-linux.cifs.lab.netapp.com>
Message-ID: <48624EB8.3070300@tqs.de>
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To: u-boot@lists.denx.de

Hi Jason,

McMullan, Jason schrieb:
> On Wed, 2008-06-25 at 07:44 +0200, Jens Gehrlein wrote:
>> I have the same problem. When I modify the source code the compiler may 
>> or may not rearrange the functions. It is not guaranteed, that the main 
>> function always starts at the same address.
>>
>> How can this be solved? Is it possible/meaningful to put the main 
>> function into a separate linker segment? Any suggestions?
> 
> The simplest way I've found is to make the following C file:
> 
> --- _start.c ---
> void _start(void)
> {
>     extern int main(int argc, char **argv);
>     char *args[] = { "myprogramname", "-foo", "bar", /* etc. etc. */ };
>     main(sizeof(args)/sizeof(args[0]), args);
>     /* Wait forever after the program ends */
>     for (;;);
> }
> -----------------
> 
> Then, link '_start.o' before *any* other objects in your link step.
> 
> Voila! The text entry should be _start!
> 
> Feel free to add BSS initialization, etc. in _start as needed.

Very nice. Thank you for this tip!

Best Regards,
Jens