On Tue, 18 Mar 2025 at 11:31, Aleksandar Rakic <aleksandar.ra...@htecgroup.com> wrote: > > Hi, > > If ieee754 equals EMULATED, then the variables mips_use_nan_2008 and > mips_use_nan_legacy are set to true > ( > https://elixir.bootlin.com/linux/v6.13.6/source/arch/mips/kernel/fpu-probe.c#L208 > ) > and any binaries are accepted regardless of whether supported by the FPU > ( https://elixir.bootlin.com/linux/v6.13.6/source/arch/mips/kernel/elf.c#L154 > )
I presume from the name of that setting that in that case a real kernel is doing trap-and-emulate for binaries of the wrong FPU type (which must perform appallingly badly...) ? Does QEMU set up the CPU for linux-user mode so that it effectively does emulation as-if both NaN modes were supported? I can't see that happening from a quick grep. Also, this doesn't seem to be related to the ABI_FP_SOFT setting. thanks -- PMM
