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Re: [PATCH v3 5/6] xen/arm: mpu: Enable MPU
- To: Luca Fancellu <Luca.Fancellu@xxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
- From: Ayan Kumar Halder <ayankuma@xxxxxxx>
- Date: Tue, 15 Oct 2024 17:02:08 +0100
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Tue, 15 Oct 2024 16:02:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14/10/2024 20:11, Luca Fancellu wrote:
Hi Ayan,
Hi Luca,
Sorry I missed something.
/*
* Maps the various sections of Xen (described in xen.lds.S) as different MPU
* regions.
@@ -68,10 +92,11 @@
* Inputs:
* lr : Address to return to.
*
- * Clobbers x0 - x5
+ * Clobbers x0 - x6
*
*/
FUNC(enable_boot_cpu_mm)
+ mov x6, lr
/* Check if the number of regions exceeded the count specified in
MPUIR_EL2 */
mrs x5, MPUIR_EL2
@@ -113,7 +138,7 @@ FUNC(enable_boot_cpu_mm)
beq 5f
prepare_xen_region x0, x1, x2, x3, x4, x5
bl enable_mpu
-5:
+5: mov lr, x6
Shall these changes to enable_boot_cpu_mm be part of the previous commit?
This is why I had to save and restore the LR.
- Ayan
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