From mboxrd@z Thu Jan  1 00:00:00 1970
From: Albert ARIBAUD <albert.u.boot@aribaud.net>
Date: Sat, 17 Jan 2015 07:40:01 +0100
Subject: [U-Boot] [PATCH] arm: fix exception vectors
In-Reply-To: <1419865853-2562-1-git-send-email-luca.ellero@brickedbrain.com>
References: <1419865853-2562-1-git-send-email-luca.ellero@brickedbrain.com>
Message-ID: <20150117074001.5ae2abd4@lilith>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

Hello Luca,

On Mon, 29 Dec 2014 16:10:53 +0100, Luca Ellero
<luca.ellero@brickedbrain.com> wrote:
> After relocation, exception vectors still point to the old code (not relocated).
> This patch fixes them.
> 
> Signed-off-by: Luca Ellero <luca.ellero@brickedbrain.com>
> ---
>  arch/arm/lib/relocate.S |   15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/arch/arm/lib/relocate.S b/arch/arm/lib/relocate.S
> index 92f5314..4186344 100644
> --- a/arch/arm/lib/relocate.S
> +++ b/arch/arm/lib/relocate.S
> @@ -76,6 +76,21 @@ copy_loop:
>  	blo	copy_loop
>  
>  	/*
> +	 * fix exception vectors
> +	 */
> +	ldr r2, =_undefined_instruction
> +	ldr r3, =_fiq
> +	add	r2, r2, r4
> +	add	r3, r3, r4
> +fix_exceptions:
> +	ldr r0, [r2]
> +	add	r0, r0, r4
> +	str	r0, [r2]
> +	cmp r2,r3
> +	add r2, #4
> +	blo fix_exceptions
> +
> +	/*
>  	 * fix .rel.dyn relocations
>  	 */
>  	ldr	r2, =__rel_dyn_start	/* r2 <- SRC &__rel_dyn_start */
> -- 
> 1.7.10.4
> 

There is already a mechanism to relocate vectors (do a git grep for
'relocate_vectors' which takes into account various ISA and SoC cases.

Can you describe the use case which you are encountering?

Amicalement,
-- 
Albert.