RT-Thread / RT-Thread/rt-thread
[Cortex-M0] stack pointer is wrong if hardfault happens in ISR
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bug
- Dominant language
- C
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Description
如果在中断里发生了hardfault，PSP记录的并不是中断栈的位置，会导致打印的hardfault信息错误
https://github.com/RT-Thread/rt-thread/blob/90fb832bf2cd518a8ac408f52fcc941ae0ac3c0b/libcpu/arm/cortex-m0/context_rvds.S#L207
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at libcpu/arm/cortex-m0/context_rvds.S around line 207, where the issue reports that PSP is recorded incorrectly when a hardfault occurs in an ISR. Reproduce or trace an ISR hardfault and compare the recorded stack pointer with the interrupt stack location. Done means the printed hardfault information uses the correct stack location for this case.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- embedded-iot, operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100