Title: Test to verify the thread-swap (context-switch) mechanism (ARM Only)
Description:
This test verifies that the ARM thread context-switch mechanism
behaves as expected. In particular, the test verifies that:
- the callee-saved registers are saved and restored, properly,
at thread swap-out and swap-in, respectively
- the floating-point callee-saved registers are saved and
restored, properly, at thread swap-out and swap-in, respectively,
when the thread is using the floating-point registers
- the thread execution priority (BASEPRI) is saved and restored,
properly, at thread context-switch
- the swap return value can be set and will be return, properly,
at thread swap-in
- the mode variable (when building with support for either user
space or FP shared registers) is saved and restored properly.
Notes:
The test verifies the correct behavior of the thread context-switch,
when it is triggered indirectly (by setting the PendSV interrupt
to pending state), as well as when the thread itself triggers its
swap-out (by calling arch_swap(.)).
The test is currently supported in ARM Cortex-M Baseline and Mainline
targets.
---------------------------------------------------------------------------
Building and Running Project:
This project outputs to the console. It can be built and executed on QEMU as
follows:
ninja/make run
---------------------------------------------------------------------------
Troubleshooting:
Problems caused by out-dated project information can be addressed by
issuing one of the following commands then rebuilding the project:
ninja/make clean # discard results of previous builds
# but keep existing configuration info
or
ninja/make pristine # discard results of previous builds
# and restore pre-defined configuration info
---------------------------------------------------------------------------
Sample Output:
***** Booting Zephyr OS build zephyr-v1.14.0-1726-gb95a71960622 *****
Running test suite arm_thread_swap
===================================================================
starting test - test_arm_thread_swap
PASS - test_arm_thread_swap
===================================================================
Test suite arm_thread_swap succeeded
===================================================================
PROJECT EXECUTION SUCCESSFUL
aec9a8c4be