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tests: arch: arm_thread_swap: test FPSCR preservation in FP_SHARING

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Under Sharing FP registers mode we would like to verify the
correct preservation of FPSCR during thread context switch.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2020-02-25 11:22:39 +01:00 • committed by Johan Hedberg
commit dca762f8ff
1 changed files with 28 additions and 0 deletions
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28
tests/arch/arm/arm_thread_swap/src/arm_thread_arch.c
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@ -240,6 +240,16 @@ static void alt_thread_entry(void)
0, sizeof(_callee_saved_t));
#if defined(CONFIG_FLOAT) && defined(CONFIG_FP_SHARING)
/* Verify that the _current_ (alt) thread is initialized with FPCA cleared. */
zassert_true((__get_CONTROL() & CONTROL_FPCA_Msk) == 0,
"CONTROL.FPCA is not cleared at initialization: 0x%x\n",
__get_CONTROL());
/* Verify that the _current_ (alt) thread is initialized with FPSCR cleared. */
zassert_true(__get_FPSCR() == 0,
"(Alt thread) FPSCR is not cleared at initialization: 0x%x\n", __get_FPSCR());
zassert_true((p_ztest_thread->arch.mode & CONTROL_FPCA_Msk) != 0,
"ztest thread mode FPCA flag not updated at swap-out: 0x%0x\n",
p_ztest_thread->arch.mode);
@ -385,6 +395,14 @@ void test_arm_thread_swap(void)
"Thread FPCA flag not clear at initialization 0x%0x\n",
_current->arch.mode);
/* Verify that the main test thread is initialized with FPCA cleared. */
zassert_true((__get_CONTROL() & CONTROL_FPCA_Msk) == 0,
"CONTROL.FPCA is not cleared at initialization: 0x%x\n",
__get_CONTROL());
/* Verify that the main test thread is initialized with FPSCR cleared. */
zassert_true(__get_FPSCR() == 0,
"FPSCR is not cleared at initialization: 0x%x\n", __get_FPSCR());
/* Clear the thread's floating-point callee-saved registers' container.
* The container will, later, be populated by the swap mechanism.
*/
@ -394,6 +412,11 @@ void test_arm_thread_swap(void)
/* Randomize the FP callee-saved registers at test initialization */
load_fp_callee_saved_regs(&ztest_thread_fp_callee_saved_regs);
/* Modify bit-0 of the FPSCR - will be checked again upon swap-in. */
zassert_true((__get_FPSCR() & 0x1) == 0,
"FPSCR bit-0 has been set before testing it\n");
__set_FPSCR(__get_FPSCR() | 0x1);
/* The main test thread is using the FP registers, but the .mode
* flag is not updated until the next context switch.
*/
@ -604,6 +627,11 @@ void test_arm_thread_swap(void)
verify_fp_callee_saved(
&ztest_thread_fp_callee_saved_regs,
&_current->arch.preempt_float);
/* Verify that the main test thread restored the FPSCR bit-0. */
zassert_true((__get_FPSCR() & 0x1) == 0x1,
"FPSCR bit-0 not restored at swap: 0x%x\n", __get_FPSCR());
#endif /* CONFIG_FLOAT && CONFIG_FP_SHARING */
}