On Fri, 21 Jun 2024, YunQiang Su wrote: > > Then GCC emits the wrong trap instruction, wherever it comes from and > > whatever has caused it. The correct ones for integer division by zero > > Thanks so much. It is not the bug of Linux kernel or GCC. > It is a bug of me ;) and qemu. > > Qemu didn't pass the code of TEQ correctly; and I haven't run this test on > real hardware.
QEMU is a simulator only and has bugs or other discrepancies from real hardware. Especially the user emulation mode combines issues with actual instruction simulation *and* the OS interface. Therefore you can use QEMU as a valuable tool in the course of making your changes, but you need to always verify the final result with real hardware before submitting it upstream. Also submissions need to include details as to how the problem addressed has been reproduced. Otherwise this is just producing noise and wasting people's time. Maciej
