riscv-software-src / riscv-software-src/opensbi
semihosting_write bug in generic
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- Dominant language
- C
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Description
semihosting_write is called in semihosting_puts which expects that semihosting_write returns the length it writes.
Length minus the return value of syswrite trap which is normally the true length the syscall writes according to the convention is returned in the implementation of semihosting_write. So semihosting_write returns zero actually.
When I am debuging the opensbi with a debugger attached, I get infinite loop of printing 'OpenSBI 1.3.1'.
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 by locating semihosting_write and its caller semihosting_puts, then inspect how the syswrite trap return value is interpreted. Verify that the write function reports the number of bytes actually written so repeated printing terminates rather than looping on the OpenSBI banner.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100