I ran a hacked Qemu with FPU off. On August 17, 2015 4:59:18 PM PDT, Andy Lutomirski <[email protected]> wrote: >On Mon, Aug 17, 2015 at 1:01 AM, Ingo Molnar <[email protected]> wrote: >> So when I re-introduced static allocations math-emu started working >again, to a >> limited degree: on a modern distro, trying to boot /bin/bash I got a >prompt, but >> various programs would segfault. I did not investigate it any deeper, >I suppose >> the FPU emulation does not go far enough for modern user-space, or >maybe it has >> more bugs. >> > >Were you testing with just no387 or did you run a VM with SSE2 and >such turned off? > >There's a *lot* of userspace that incorrectly checks for instructions >without checking for the state support. I've filed bugs against >libgcc for this and they're still not fixed IIRC. > >--Andy
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