W-M-R opened a new pull request, #21361:
URL: https://github.com/apache/nuttx/pull/21361
## Summary
- `arm64_fork.c`: `fork()` did not copy `SCTLR_EL1` into the child context,
so
the child ran with whatever value the previous task left behind. Copy it
from the parent and force `TCF1` when `CONFIG_ARM64_MTE` is enabled.
- `arm64_hwdebug.c`: clear `OSDLR_EL1`/`OSLAR_EL1` when enabling the debug
monitor, as required on armv8-R; otherwise stale software lock state is
left behind.
- `arm64_arch_timer.c`: remove an unused timer compare helper.
- `boards/arm64/fvp-v8r/fvp-armv8r/scripts/dramboot.ld`: drop the leftover
`. = + 60;` location-counter expression.
## Impact
- Corrects fork state on arm64 and hwdebug on armv8-R.
- The remaining two changes are dead code and linker script cleanups.
## Testing
Host: Ubuntu 22.04, qemu-system-aarch64 8.2, aarch64-none-elf-gcc 13.
fork / SCTLR_EL1:
./tools/configure.sh -l qemu-armv8a:nsh_smp
make -j
# boot as documented, then:
nsh> ostest
`ostest` runs the fork test; the child no longer inherits a stale
`SCTLR_EL1`.
Repeated `fork()` + `exec()` in a loop also passes.
MTE variant: build `qemu-armv8a:mte`, boot with `-cpu max ... mte=on` and run
`mtetest`.
hwdebug on armv8-R and the `dramboot.ld` change were build-tested with the
`fvp-armv8r:nsh` config; running them needs the Arm FVP model, not QEMU.
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