FreeRTOS: add ARMv8-M (Cortex-M33) NTZ thread context support#1957
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LukasLendvorsky wants to merge 1 commit intopyocd:mainfrom
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FreeRTOS: add ARMv8-M (Cortex-M33) NTZ thread context support#1957LukasLendvorsky wants to merge 1 commit intopyocd:mainfrom
LukasLendvorsky wants to merge 1 commit intopyocd:mainfrom
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The Cortex-M33 NTZ FreeRTOS port (portable/GCC/ARM_CM33_NTZ) uses a different PendSV stacking order than the Cortex-M4 port: M4: [r4-r11, <exc_return>, <s16-s31>] [HW frame] M33: [psplim, exc_return, r4-r11, <s16-s31>] [HW frame] This caused incorrect stack unwinding for non-current FreeRTOS threads when debugging Cortex-M33 targets, as the register offset tables assumed M4 stacking. Add M33-specific register offset tables that account for the extra psplim and exc_return words at the start of the software-saved frame, and select them based on the core's architecture at runtime.
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Freertos stack decode doesn't work for The Cortex-M33, because its FreeRTOS port (portable/GCC/ARM_CM33_NTZ) uses a different PendSV stacking order than the Cortex-M4 port.
This adds support specifically for M33 without trust zone. Its written by Claude and I tested that it works well with my MCU. It will still break with trust zone and possibly with other freertos versions/configurations, but this is surely better than without any specific M33 support.