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RE: [PATCH 7/9] xen/arm64: head: Rework PRINT() to work when the string is not withing +/- 1MB
- To: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Mon, 26 Jun 2023 14:44:13 +0000
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- Cc: Luca Fancellu <Luca.Fancellu@xxxxxxx>, "michal.orzel@xxxxxxx" <michal.orzel@xxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Mon, 26 Jun 2023 14:45:05 +0000
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- Thread-topic: [PATCH 7/9] xen/arm64: head: Rework PRINT() to work when the string is not withing +/- 1MB
Hi Julien,
> -----Original Message-----
> Subject: [PATCH 7/9] xen/arm64: head: Rework PRINT() to work when the
> string is not withing +/- 1MB
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> The instruction ADR is able to load an address of a symbol that is
> within the range +/- 1 MB of the instruction.
>
> While today Xen is quite small (~1MB), it could grow up to 2MB in the
> current setup. So there is no guarantee that the instruction can
> load the string address (stored in rodata).
>
> So replace the instruction ADR with the pseudo-instruction ADR_L
> which is able to handle symbol within the range +/- 4GB.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Henry Wang <Henry.Wang@xxxxxxx>
Kind regards,
Henry
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