Implement write access to FPCSR if SR[SUMRA] is raised.

openrisc / mor1kx

mor1kx - an OpenRISC 1000 processor IP core

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Implement write access to FPCSR if SR[SUMRA] is raised. #145

Closed bandvig closed 2 years ago

bandvig commented 2 years ago

@stffrdhrn Stafford, In framework of https://openrisc.io/proposals/p17-user-mode-fpcsr proposal, I've implemented write access to FPSCR if SR[SUMRA] is raised. Please find the modifications in fpcsr_sumra branch. The modifications are quite similar those I did for MAROCCHINO (in the similar branch). I hope you can use the branch for implementation FP support in glibc and linux.

stffrdhrn commented 2 years ago

Hi @bandvig

The change looks good. But I am thinking maybe we should not use Sr[sumra] and just make fpscr always accessible. It will make the change easier and it seems like what other architecturesc do.

What do you think? I can update the proposal

bandvig commented 2 years ago

@stffrdhrn I have no objection. I also created fpcsr_free_access branches for both mor1kx and or1k_marochino. Modifications are trivial.

stffrdhrn commented 2 years ago

Merged the fix