Title: Test to verify the no multithreading use-case (ARM Only)
Description:
This test verifies that a Zephyr build without multithreading
support (CONFIG_MULTITHREADING=n) works as expected. Only for
ARM Cortex-M targets. In detail the test verifies that
- system boots to main()
- PSP points to the main stack
- PSPLIM is set to the main stack base (if applicable)
- FPU state is reset (if applicable)
- Interrupts are enabled when switching to main()
- Interrupts may be registered and serviced
- Activating PendSV triggers a Reserved Exception error
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Building and Running Project:
This project outputs to the console. It can be built and executed on QEMU as
follows:
ninja/make run
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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
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Sample Output:
*** Booting Zephyr OS build zephyr-v2.6.0-349-g032d10878792 ***
ARM no-multithreading test
E: ***** Reserved Exception ( -2) *****
E: r0/a1: 0x0000001b r1/a2: 0x000044d8 r2/a3: 0xe000ed00
E: r3/a4: 0x10000000 r12/ip: 0x0000000a r14/lr: 0x00001473
E: xpsr: 0x61000000
E: Faulting instruction address (r15/pc): 0x00001510
E: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
E: Current thread: (nil) (unknown)
Caught system error -- reason 0
Available IRQ line: 25
ARM no multithreading test successful
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PROJECT EXECUTION SUCCESSFUL
345735d0a8