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cortex-M ports: Clarify hardware-saved exception frame size variable (#1314)

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* cortex-M ports: Clarify hardware-saved exception frame size variable

- Rename ulStackFrameSize to ulHardwareSavedExceptionFrameSize to
reflect the hardware-saved exception frame (8 or 26 words based
on FPU/lazy stacking).
- Add comments explaining standard vs extended frames.
- Apply across Cortex-M ports.
- No functional change, improves readability.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>
Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

* kernel-checker-script: Modify Arm copyright header regex

Arm's copyright header regex is modified with the following:

* Accept both single year copyright headers (e.g., "2024")
and year range copyright headers (e.g., "2024-2025").

* Accept both single-line copyright header and also
multi-line header.

* Add the escape backslash to accept only literal dot
not any character.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

---------

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>
Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Ahmed Ismail 2025-09-09 07:25:42 +01:00 • committed by GitHub
parent ccabdec2f8
commit 44ae6cf61a
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GPG key ID: B5690EEEBB952194
27 changed files with 561 additions and 343 deletions
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22
portable/GCC/ARM_CM3_MPU/port.c
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@ -1,6 +1,8 @@
/*
* FreeRTOS Kernel <DEVELOPMENT BRANCH>
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* Copyright 2025 Arm Limited and/or its affiliates
* <open-source-office@arm.com>
*
* SPDX-License-Identifier: MIT
*
@ -484,7 +486,10 @@ void vSVCHandler_C( uint32_t * pulParam ) /* PRIVILEGED_FUNCTION */
xMPU_SETTINGS * pxMpuSettings;
uint32_t * pulSystemCallStack;
uint32_t ulSystemCallLocation, i;
const uint32_t ulStackFrameSize = 8;
/* Hardware Saved Stack Frame Size upon Exception entry:
* Basic frame (R0-R3, R12, LR, PC, and xPSR) = 8 words.
*/
const uint32_t ulHardwareSavedExceptionFrameSize = 8;
#if defined( __ARMCC_VERSION )
/* Declaration when these variable are defined in code instead of being
@ -520,10 +525,10 @@ void vSVCHandler_C( uint32_t * pulParam ) /* PRIVILEGED_FUNCTION */
pulSystemCallStack = pxMpuSettings->xSystemCallStackInfo.pulSystemCallStack;
/* Make space on the system call stack for the stack frame. */
pulSystemCallStack = pulSystemCallStack - ulStackFrameSize;
pulSystemCallStack = pulSystemCallStack - ulHardwareSavedExceptionFrameSize;
/* Copy the stack frame. */
for( i = 0; i < ulStackFrameSize; i++ )
for( i = 0; i < ulHardwareSavedExceptionFrameSize; i++ )
{
pulSystemCallStack[ i ] = pulTaskStack[ i ];
}
@ -541,7 +546,7 @@ void vSVCHandler_C( uint32_t * pulParam ) /* PRIVILEGED_FUNCTION */
/* Remember the location where we should copy the stack frame when we exit from
* the system call. */
pxMpuSettings->xSystemCallStackInfo.pulTaskStack = pulTaskStack + ulStackFrameSize;
pxMpuSettings->xSystemCallStackInfo.pulTaskStack = pulTaskStack + ulHardwareSavedExceptionFrameSize;
/* Store the value of the Link Register before the SVC was raised.
* It contains the address of the caller of the System Call entry
@ -594,7 +599,10 @@ void vSVCHandler_C( uint32_t * pulParam ) /* PRIVILEGED_FUNCTION */
xMPU_SETTINGS * pxMpuSettings;
uint32_t * pulTaskStack;
uint32_t ulSystemCallLocation, i;
const uint32_t ulStackFrameSize = 8;
/* Hardware Saved Stack Frame Size upon Exception entry:
* Basic frame (R0-R3, R12, LR, PC, and xPSR) = 8 words.
*/
const uint32_t ulHardwareSavedExceptionFrameSize = 8;
#if defined( __ARMCC_VERSION )
/* Declaration when these variable are defined in code instead of being
@ -626,10 +634,10 @@ void vSVCHandler_C( uint32_t * pulParam ) /* PRIVILEGED_FUNCTION */
pulTaskStack = pxMpuSettings->xSystemCallStackInfo.pulTaskStack;
/* Make space on the task stack for the stack frame. */
pulTaskStack = pulTaskStack - ulStackFrameSize;
pulTaskStack = pulTaskStack - ulHardwareSavedExceptionFrameSize;
/* Copy the stack frame. */
for( i = 0; i < ulStackFrameSize; i++ )
for( i = 0; i < ulHardwareSavedExceptionFrameSize; i++ )
{
pulTaskStack[ i ] = pulSystemCallStack[ i ];
}