The application writer needs to name their IRQ handler as:
1. vApplicationIRQHandler if the IRQ handler does not use FPU registers.
2. vApplicationFPUSafeIRQHandler is the IRQ handler uses FPU registers.
When the application uses vApplicationFPUSafeIRQHandler, a default
implementation of vApplicationIRQHandler is used which stores FPU
registers and then calls vApplicationFPUSafeIRQHandler.
Note that recent versions of GCC may use FP/SIMD registers to optimize 16-bytes
copy and especially when using va_start()/va_arg() functions (e.g printing some thing
in IRQ handlers may trigger usage of FPU registers)
This implementation is heavily inspired by both the ARM_CA9 port and the ARM_CRx_No_GIC
port done in [1]
[1] https://github.com/FreeRTOS/FreeRTOS-Kernel/pull/1113
Signed-off-by: Marouen Ghodhbane <marouen.ghodhbane@nxp.com>
FPSR and FPCR are two 64-bits registers where only the lower 32 bits are defined.
Save them when doing context switch with FPU context saving enabled.
Signed-off-by: Marouen Ghodhbane <marouen.ghodhbane@nxp.com>
This is a direct backport of upstream commit [1] for aarch64 (legacy operation port)
done under [2]
The same code can be applied on the aarch SRE port to be able to enable FPU context
saving on all tasks context switch to mitigate GCC optimization to use SIMD registers
for copy.
[1] "55eceb22: Add configUSE_TASK_FPU_SUPPORT to AARCH64 port (#1048)"
[2] https://github.com/FreeRTOS/FreeRTOS-Kernel/pull/1048
Signed-off-by: Marouen Ghodhbane <marouen.ghodhbane@nxp.com>
* Rename Arm_AARCH64 to ARM_AARCH64
* Rename Arm_AARCH64_SRE to ARM_AARCH64_SRE
* Update cmake for ARM port folder capitalization
* Update in portable/CmakeLists.txt
* Use capitalization name in port README.md
---------
Co-authored-by: Ching-Hsin Lee <chinglee@amazon.com>
Marouen Ghodhbane
ActoryOu
Florian La Roche
Soren Ptak
Eric Jackson