cpu/cortexm_common: enable FPU on cortexm33

[aabadie]

Contribution description

Cortex-M33 CPUs provide an FPU. This PR enables this feature for this CPU core.

Testing procedure

• Green Murdock
• tests/float is working on CortexM33 boards:

b-u585i-iot02a

$ BUILD_IN_DOCKER=1 BOARD=b-u585i-iot02a make -C tests/float flash test --no-print-directory 
Launching build container using image "riot/riotbuild:latest".
docker run --rm --tty --user $(id -u) -v '/usr/share/zoneinfo/Europe/Paris:/etc/localtime:ro' -v '/work/riot/RIOT:/data/riotbuild/riotbase:delegated' -v '/home/aabadie/.cargo/registry:/data/riotbuild/.cargo/registry:delegated' -v '/home/aabadie/.cargo/git:/data/riotbuild/.cargo/git:delegated' -e 'RIOTBASE=/data/riotbuild/riotbase' -e 'CCACHE_BASEDIR=/data/riotbuild/riotbase' -e 'BUILD_DIR=/data/riotbuild/riotbase/build' -e 'RIOTPROJECT=/data/riotbuild/riotbase' -e 'RIOTCPU=/data/riotbuild/riotbase/cpu' -e 'RIOTBOARD=/data/riotbuild/riotbase/boards' -e 'RIOTMAKE=/data/riotbuild/riotbase/makefiles'      -e 'BOARD=b-u585i-iot02a' -e 'DISABLE_MODULE=' -e 'DEFAULT_MODULE=test_utils_interactive_sync test_utils_print_stack_usage' -e 'FEATURES_REQUIRED=' -e 'FEATURES_BLACKLIST=' -e 'FEATURES_OPTIONAL=' -e 'USEMODULE=' -e 'USEPKG='  -w '/data/riotbuild/riotbase/tests/float/' 'riot/riotbuild:latest' make     
Building application "tests_float" for "b-u585i-iot02a" with MCU "stm32".

"make" -C /data/riotbuild/riotbase/boards/b-u585i-iot02a
"make" -C /data/riotbuild/riotbase/boards/common/init
"make" -C /data/riotbuild/riotbase/core
"make" -C /data/riotbuild/riotbase/core/lib
"make" -C /data/riotbuild/riotbase/cpu/stm32
"make" -C /data/riotbuild/riotbase/cpu/cortexm_common
"make" -C /data/riotbuild/riotbase/cpu/cortexm_common/periph
"make" -C /data/riotbuild/riotbase/cpu/stm32/periph
"make" -C /data/riotbuild/riotbase/cpu/stm32/stmclk
"make" -C /data/riotbuild/riotbase/cpu/stm32/vectors
"make" -C /data/riotbuild/riotbase/drivers
"make" -C /data/riotbuild/riotbase/drivers/periph_common
"make" -C /data/riotbuild/riotbase/sys
"make" -C /data/riotbuild/riotbase/sys/auto_init
"make" -C /data/riotbuild/riotbase/sys/div
"make" -C /data/riotbuild/riotbase/sys/isrpipe
"make" -C /data/riotbuild/riotbase/sys/malloc_thread_safe
"make" -C /data/riotbuild/riotbase/sys/newlib_syscalls_default
"make" -C /data/riotbuild/riotbase/sys/pm_layered
"make" -C /data/riotbuild/riotbase/sys/stdio_uart
"make" -C /data/riotbuild/riotbase/sys/test_utils/interactive_sync
"make" -C /data/riotbuild/riotbase/sys/test_utils/print_stack_usage
"make" -C /data/riotbuild/riotbase/sys/tsrb
   text	   data	    bss	    dec	    hex	filename
  12440	    140	   2392	  14972	   3a7c	/data/riotbuild/riotbase/tests/float/bin/b-u585i-iot02a/tests_float.elf
/work/riot/RIOT/dist/tools/openocd/openocd.sh flash /work/riot/RIOT/tests/float/bin/b-u585i-iot02a/tests_float.elf
### Flashing Target ###
Open On-Chip Debugger 0.11.0+dev-00551-gaad871805 (2022-01-06-14:44)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
hla_swd
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
Info : DEPRECATED target event trace-config; use TPIU events {pre,post}-{enable,disable}
srst_only separate srst_nogate srst_open_drain connect_assert_srst

Info : clock speed 500 kHz
Info : STLINK V3J7M3 (API v3) VID:PID 0483:374E
Info : Target voltage: 3.276368
Info : stm32u5x.cpu: Cortex-M33 r0p4 processor detected
Info : stm32u5x.cpu: target has 8 breakpoints, 4 watchpoints
Info : starting gdb server for stm32u5x.cpu on 0
Info : Listening on port 40831 for gdb connections
    TargetName         Type       Endian TapName            State       
--  ------------------ ---------- ------ ------------------ ------------
 0* stm32u5x.cpu       hla_target little stm32u5x.cpu       reset

Info : Unable to match requested speed 480 kHz, using 200 kHz
Info : Unable to match requested speed 480 kHz, using 200 kHz
stm32u5x.dap
Error executing event halted on target stm32u5x.cpu:
/usr/local/bin/../share/openocd/scripts/target/stm32u5x.cfg:122: Error: 
in procedure 'ocd_process_reset' 
in procedure 'ocd_process_reset_inner' called at file "embedded:startup.tcl", line 854
in procedure 'ahb_ap_non_secure_access' called at file "/usr/local/bin/../share/openocd/scripts/target/stm32u5x.cfg", line 158
at file "/usr/local/bin/../share/openocd/scripts/target/stm32u5x.cfg", line 122
target halted due to debug-request, current mode: Thread 
xPSR: 0xf9000000 pc: 0x080008cc msp: 0x20000200
Info : device idcode = 0x20006482 (STM32U57/U58xx - Rev B : 0x2000)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : flash size = 2048kbytes
Info : flash mode : dual-bank
Info : Padding image section 2 at 0x08003124 with 12 bytes (bank write end alignment)
Warn : Adding extra erase range, 0x08003130 .. 0x08003fff
auto erase enabled
wrote 12592 bytes from file /work/riot/RIOT/tests/float/bin/b-u585i-iot02a/tests_float.elf in 1.100670s (11.172 KiB/s)

verified 12580 bytes in 0.909135s (13.513 KiB/s)

Info : Unable to match requested speed 480 kHz, using 200 kHz
Info : Unable to match requested speed 480 kHz, using 200 kHz
shutdown command invoked
Done flashing
r
/work/riot/RIOT/dist/tools/pyterm/pyterm -p "/dev/ttyACM0" -b "115200" --no-reconnect --noprefix --no-repeat-command-on-empty-line 
Twisted not available, please install it if you want to use pyterm's JSON capabilities
Connect to serial port /dev/ttyACM0
/work/riot/RIOT/dist/tools/pyterm/pyterm:289: DeprecationWarning: setDaemon() is deprecated, set the daemon attribute instead
  receiver_thread.setDaemon(1)
Welcome to pyterm!
Type '/exit' to exit.
READY
s
START
main(): This is RIOT! (Version: 2022.07-devel-349-gdd043-pr/cpu/cortexm33_fpu)
Testing floating point arithmetic...

[SUCCESS]

Issues/PRs references

None