sdc-g commented on PR #15985: URL: https://github.com/apache/nuttx/pull/15985#issuecomment-2728858391
Hi @chirping78 thanks so much for your comment. > To prevent the resuming action be interrupted, REG_PS.EXCM is set to 1 [here](https://github.com/apache/nuttx/blob/master/arch/xtensa/src/common/xtensa_user_handler.S#L317) and [here](https://github.com/apache/nuttx/blob/master/arch/xtensa/src/common/xtensa_int_handlers.S#L224) I'm so sorry, I do NOT enough check the latest Nuttx code. I am working at branched version around 12.5. Actually, I also provide one similar assembly code change internally. So I think, by using your changes, the issue also can fixed. But let me try to reproduce and double confirm. > If new task be resumed by level2 and above: rfi will restores the PS from EPS[N] and jump to the address in EPC[N]. Problem will be here, after the new task be resumed, the PS.EXCM bit is still set. If window rotation related instruction is executed, error will arise. This PR changes the initial value of PS.EXCM. While high level interrupt, e.g., swint as level 3 to switch to the new thread, what is the value of its EPS_3? PS.EXCM is cleared [here](https://github.com/apache/nuttx/blob/master/arch/xtensa/src/common/xtensa_swint.c#L387): -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
