Gary-Hobson commented on PR #18150:
URL: https://github.com/apache/nuttx/pull/18150#issuecomment-3798266529
Since the timer interrupt uses the exception_direct method in the latest
code, it cannot obtain the thread's PC within the interrupt. As a result, all
timer-sampling-based gprof features fail to work correctly. The timer interrupt
needs to be changed to the exception_common method.
For chips using SysTick, you only need to change the two occurrences of
NVIC_IRQ_PENDSV to NVIC_IRQ_SYSTICK in
nuttx/arch/arm/src/armv[6/7/8]-m/arm_vectors.c.
For example, for mps2-an500 (Cortex-M7), the modified result is as follows:
```c
--- a/arch/arm/src/armv7-m/arm_vectors.c
+++ b/arch/arm/src/armv7-m/arm_vectors.c
@@ -101,7 +101,7 @@ const void * const _vectors[] locate_data(".vectors")
/* Vectors 2 - n point directly at the generic handler */
- [2 ... NVIC_IRQ_PENDSV] = &exception_common,
- [(NVIC_IRQ_PENDSV + 1) ... (15 + ARMV7M_PERIPHERAL_INTERRUPTS)]
+ [2 ... NVIC_IRQ_SYSTICK] = &exception_common,
+ [(NVIC_IRQ_SYSTICK + 1) ... (15 + ARMV7M_PERIPHERAL_INTERRUPTS)]
= &exception_direct
};
```
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