hujun260 opened a new pull request, #21738:
URL: https://github.com/apache/nuttx/pull/21738
# NuttX PR Description
## Title
arm: add arm_a_r directory
## Description
This PR introduces the shared `arm_a_r` architecture source directory as a
preparation step for merging common functionality across the ARM, ARMv7-A,
ARMv7-R, and ARMv8-R profiles.
## Changes
- Add `arch/arm/src/arm_a_r/CMakeLists.txt` and `Make.defs`.
- Move the shared signal scheduling and signal delivery implementations into
`arch/arm/src/arm_a_r`:
- `arm_schedulesigaction.c`
- `arm_sigdeliver.c`
- Update ARM source Makefile and CMake integration.
- Remove duplicated signal implementation files from the old ARM profile
directories.
- Update ARM, ARMv7-A, ARMv7-R, and ARMv8-R build definitions to use the
shared directory.
- Update the ARM toolchain CMake configuration for the new source
organization.
## Motivation
Reduce duplicated ARM signal-handling implementations and prepare the source
layout for the subsequent merge of common functions shared by ARM, ARMv7-A,
ARMv7-R, and ARMv8-R. Runtime signal behavior is intended to remain unchanged.
## Runtime Testing
The reorganized ARM source tree was built and executed using the ARMv7-A
QEMU configuration `qemu-armv8a:nsh`.
### ARMv7-A build
```text
-- Board: qemu-armv7a
-- Config: nsh
-- The C compiler identification is GNU 13.2.1
+[1328/1328] Linking CXX executable final_nuttx
Memory region Used Size Region Size %age Used
ROM: 373960 B 1 MB 35.66%
RAM: 28 KB 16 MB 0.17%
```
The build completed successfully and produced `build/nuttx`. The linker
emitted only the existing RWX LOAD segment warning.
### ARMv7-A QEMU startup
```text
nsh> ostest
```
### ARMv7-A `ostest`
```text
user_main: vfork() test
vfork_test: Started
vfork_test: Child 7 ran and exited before the parent resumed
user_main: FPU test
fpu_test: Started task FPU#1 at PID=8
fpu_test: Started task FPU#2 at PID=9
FPU#1: Succeeded
FPU#2: Succeeded
user_main: wqueue test
wqueue_test: backend = flat
wqueue_test: HPWORK done
wqueue_test: custom queue, threads = 1 done
wqueue_test: custom queue, threads = 2 done
wqueue_test: multiple custom queues done
wqueue_test: teardown done
user_main: mutex test
mutex_test: PASSED
user_main: signal handler test
sighand_test: SUCCESS
user_main: nested signal handler test
signest_test: done
user_main: priority inheritance test
priority_inheritance: PASSED Priority were correctly restored.
priority_inheritance: Finished
user_main: scheduler lock test
sched_lock: PASSED No pre-emption occurred while scheduler was locked.
sched_lock: Finished
Final memory usage:
VARIABLE BEFORE AFTER
======== ======== ========
arena ff3ffc ff3ffc
ordblks 2 7
mxordblk fec130 fd5460
uordblks 7d94 7ed4
fordblks fec268 fec128
user_main: Exiting
ostest_main: Exiting with status 0
```
## Testing Status
- [x] Built with the ARMv7-A QEMU `nsh` configuration.
- [x] Executed ARMv7-A `ostest` under QEMU.
- [x] `ostest_main: Exiting with status 0`.
- [ ] Compile-tested all affected ARMv7-R and ARMv8-R variants.
- [ ] Tested signal delivery on each affected ARM profile.
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