README.txt
1Title: Test suite to verify the thread-swap (context-switch) and system-calls
2mechanisms (ARM Only)
3
4Description:
5
6Thread-swap test:
7
8This test verifies that the ARM thread context-switch mechanism
9behaves as expected. In particular, the test verifies that:
10- the callee-saved registers are saved and restored, properly,
11 at thread swap-out and swap-in, respectively
12- the floating-point callee-saved registers are saved and
13 restored, properly, at thread swap-out and swap-in, respectively,
14 when the thread is using the floating-point registers
15- the thread execution priority (BASEPRI) is saved and restored,
16 properly, at thread context-switch
17- the swap return value can be set and will be return, properly,
18 at thread swap-in
19- the mode variable (when building with support for either user
20 space or FP shared registers) is saved and restored properly.
21- the CPU registers are scrubbed after system call
22
23Notes:
24 The test verifies the correct behavior of the thread context-switch,
25 when it is triggered indirectly (by setting the PendSV interrupt
26 to pending state), as well as when the thread itself triggers its
27 swap-out (by calling arch_swap(.)).
28
29 The test is currently supported in ARM Cortex-M Baseline and Mainline
30 targets.
31
32Syscalls test:
33
34This test verifies that the ARM mechanism for user system calls
35behaves as expected. In particular, the test verifies that:
36- the mode variable with respect to the user mode flag always indicates
37 the mode in which a user thread is currently executing.
38- threads in system calls are using the privileged thread stack
39- stack pointer limit checking mechanism behaves as expected for
40 user threads in PRIV mode and supervisor threads
41
42The test is currently supported in ARM Cortex-M Baseline and Mainline
43targets with support for user space.
44
45---------------------------------------------------------------------------
46
47Building and Running Project:
48
49This project outputs to the console. It can be built and executed on QEMU as
50follows:
51
52 ninja/make run
53
54---------------------------------------------------------------------------
55
56Troubleshooting:
57
58Problems caused by out-dated project information can be addressed by
59issuing one of the following commands then rebuilding the project:
60
61 ninja/make clean # discard results of previous builds
62 # but keep existing configuration info
63or
64 ninja/make pristine # discard results of previous builds
65 # and restore pre-defined configuration info
66
67---------------------------------------------------------------------------
68
69Sample Output:
70
71***** Booting Zephyr OS build zephyr-v1.14.0-1726-gb95a71960622 *****
72Running test suite arm_thread_swap
73===================================================================
74starting test - test_arm_thread_swap
75PASS - test_arm_thread_swap
76===================================================================
77Test suite arm_thread_swap succeeded
78Running test suite arm_syscalls
79===================================================================
80starting test - test_arm_syscalls
81Available IRQ line: 68
82USR Thread: IRQ Line: 68
83PASS - test_arm_syscalls
84===================================================================
85Test suite arm_syscalls succeeded
86===================================================================
87PROJECT EXECUTION SUCCESSFUL
88
