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armv8-m: Do not overwrite Control register value

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The current ARMv8-M FreeRTOS-Kernel Port code
implementation is modified in a way that allows
the CONTROL register's value to be retained
rather than being overwritten.

This is needed for adding PACBTI support as
the special-purpose CONTROL register `PAC_EN`,
`UPAC_EN`, `BTI_EN`, and `UBTI_EN` PACBTI
enablement bits should be configured before calling
`vRestoreContextOfFirstTask()` function which currently
overwrite the value inside the CONTROL register.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>
This commit is contained in:
Ahmed Ismail 2024-09-11 14:59:16 +01:00 • committed by Ahmed Ismail
parent 40e48a090e
commit 4d0a28d269
20 changed files with 100 additions and 40 deletions
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7
portable/GCC/ARM_CM55/non_secure/portasm.c
View file

@ -1,6 +1,8 @@
/*
* FreeRTOS Kernel <DEVELOPMENT BRANCH>
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* Copyright 2024 Arm Limited and/or its affiliates
* <open-source-office@arm.com>
*
* SPDX-License-Identifier: MIT
*
@ -134,8 +136,9 @@
" ldr r4, =xSecureContext \n"
" str r1, [r4] \n" /* Set xSecureContext to this task's value for the same. */
" msr psplim, r2 \n" /* Set this task's PSPLIM value. */
" movs r1, #2 \n" /* r1 = 2. */
" msr CONTROL, r1 \n" /* Switch to use PSP in the thread mode. */
" mrs r1, control \n" /* Obtain current control register value. */
" orrs r1, r1, #2 \n" /* r1 = r1 | 0x2 - Set the second bit to use the program stack pointer (PSP). */
" msr control, r1 \n" /* Write back the new control register value. */
" adds r0, #32 \n" /* Discard everything up to r0. */
" msr psp, r0 \n" /* This is now the new top of stack to use in the task. */
" isb \n"