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Hardfault when accessing FPSCR register
QEMU release version: v6.0.0-rc2
command line:
qemu-system-arm -machine mps3-an547 -nographic -kernel <my_project>.elf -semihosting -semihosting-config enable=on,target=native
host operating system: Linux ISCNR90TMR1S 5.4.72-microsoft-standard-WSL2 #1 SMP Wed Oct 28 23:40:43 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
guest operating system: none (bare metal)
Observation:
I am simulating embedded firmware for a Cortex-M55 device, using MPS3-AN547 machine. In the startup code I am accessing the FPSCR core register:
unsigned int fpscr =__get_FPSCR();
fpscr = fpscr & (~FPU_FPDSCR_AHP_Msk);
__set_FPSCR(fpscr);
where the register access functions __get_FPSCR() and __set_FPSCR(fpscr) are taken from CMSIS_5 at ./CMSIS/Core/include/cmsis_gcc.h
I observe hardfaults upon __get_FPSCR() and __set_FPSCR(fpscr). The same startup code works fine on the Arm Corstone-300 FVP.
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