[Bug]arm64: Initialize sctrl_el1 when running fork

[W-M-R]

Note: Please adhere to Contributing Guidelines.

Summary

arm64: Initialize sctrl_el1 when running fork

Impact

If fork does not initialize sctrl_el1 in arm64 platform, it will cause the child process to start incorrectly and the system to crash.

Testing

CI

[lupyuen]

@nuttxpr test qemu-armv8a:netnsh

[nuttxpr]

[Experimental Bot, please feedback here]

Build and Test Successful (qemu-armv8a:netnsh)
https://gitlab.com/lupyuen/nuttx-build-log/-/snippets/4808026

$ git clone https://github.com/W-M-R/nuttx nuttx --branch mte-sctlr
$ git clone https://github.com/apache/nuttx-apps apps --branch master
$ pushd nuttx
$ git reset --hard HEAD
HEAD is now at 3742be91c3 arm64: Initialize sctrl_el1 when running fork
$ popd
$ pushd apps
$ git reset --hard HEAD
HEAD is now at 62894b9ba examples/spislave_test: Add user data receive
$ popd
NuttX Source: https://github.com/apache/nuttx/tree/3742be91c3f0c98001f311700f0aca89a53075f3
NuttX Apps: https://github.com/apache/nuttx-apps/tree/62894b9baf2978815ceec454e53118e6d83c84f6
$ cd nuttx
$ tools/configure.sh qemu-armv8a:netnsh
$ make -j
$ dd if=/dev/zero of=./mydisk-1gb.img bs=1M count=1024
$ qemu-system-aarch64 --version
QEMU emulator version 8.2.2 (Debian 1:8.2.2+ds-0ubuntu1.5)
$ qemu-system-aarch64 -cpu cortex-a53 -nographic -machine virt,virtualization=on,gic-version=3 -chardev stdio,id=con,mux=on -serial chardev:con -global virtio-mmio.force-legacy=false -device virtio-serial-device,bus=virtio-mmio-bus.0 -chardev socket,telnet=on,host=127.0.0.1,port=3450,server=on,wait=off,id=foo -device virtconsole,chardev=foo -device virtio-rng-device,bus=virtio-mmio-bus.1 -netdev user,id=u1,hostfwd=tcp:127.0.0.1:10023-10.0.2.15:23,hostfwd=tcp:127.0.0.1:15001-10.0.2.15:5001 -device virtio-net-device,netdev=u1,bus=virtio-mmio-bus.2 -drive file=./mydisk-1gb.img,if=none,format=raw,id=hd -device virtio-blk-device,bus=virtio-mmio-bus.3,drive=hd -mon chardev=con,mode=readline -kernel ./nuttx
nsh> uname -a
NuttX  0.0.0 3742be91c3 Feb 18 2025 20:17:34 arm64 qemu-armv8a
nsh> ostest
VARIABLE  BEFORE   AFTER
======== ======== ========
arena     7be7000  7be7000
ordblks         8        6
mxordblk  7b91f38  7b8fef8
uordblks    51878    54c48
fordblks  7b95788  7b923b8
user_main: Exiting
ostest_main: Exiting with status 0

[lupyuen]

Tested OK with OSTest on Arm64 QEMU. Thanks :-)

• [Bug]arm64: Initialize sctrl_el1 when running fork #15857 (comment)

[lupyuen]

@W-M-R Please remember to:

• Fill in the Commit Description: 3742be9
• Remove this from the PR Description: 'Note: Please adhere to..."
• Could you explain why we need to init sctrl_el1 when running fork, and why it wasn't done earlier? Please fill in the PR Description. Thanks :-)

[W-M-R]

@W-M-R Please remember to:

• Fill in the Commit Description: 3742be9
• Remove this from the PR Description: 'Note: Please adhere to..."
• Could you explain why we need to init sctrl_el1 when running fork, and why it wasn't done earlier? Please fill in the PR Description. Thanks :-)

OK