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Re: [GIT PULL] x86 fixes

From "H. Peter Anvin" <hpa@zytor.com>
Newsgroups linux.kernel
Subject Re: [GIT PULL] x86 fixes
Date 2015-08-18 02:10 +0200
Message-ID <pYCDv-6cc-7@gated-at.bofh.it> (permalink)
References <pXhrr-3w7-1@gated-at.bofh.it> <pXrTQ-1Dj-17@gated-at.bofh.it> <pYnEv-1sk-19@gated-at.bofh.it> <pYCtP-5KG-11@gated-at.bofh.it>
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I ran a hacked Qemu with FPU off.

On August 17, 2015 4:59:18 PM PDT, Andy Lutomirski <luto@amacapital.net> wrote:
>On Mon, Aug 17, 2015 at 1:01 AM, Ingo Molnar <mingo@kernel.org> 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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Thread

[GIT PULL] x86 fixes Ingo Molnar <mingo@kernel.org> - 2015-08-14 09:20 +0200
  Re: [GIT PULL] x86 fixes Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 20:30 +0200
    Re: [GIT PULL] x86 fixes Andy Lutomirski <luto@amacapital.net> - 2015-08-14 20:50 +0200
      Re: [GIT PULL] x86 fixes Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 21:00 +0200
        Re: [GIT PULL] x86 fixes Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 21:10 +0200
          Re: [GIT PULL] x86 fixes Andy Lutomirski <luto@amacapital.net> - 2015-08-14 21:20 +0200
            Re: [GIT PULL] x86 fixes Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 21:40 +0200
        Re: [GIT PULL] x86 fixes Andy Lutomirski <luto@amacapital.net> - 2015-08-14 21:20 +0200
    Re: [GIT PULL] x86 fixes Ingo Molnar <mingo@kernel.org> - 2015-08-17 10:10 +0200
      Re: [GIT PULL] x86 fixes Denys Vlasenko <dvlasenk@redhat.com> - 2015-08-17 13:00 +0200
        Re: [GIT PULL] x86 fixes Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-17 19:00 +0200
          Re: [GIT PULL] x86 fixes Ingo Molnar <mingo@kernel.org> - 2015-08-18 10:00 +0200
      Re: [GIT PULL] x86 fixes Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-17 18:50 +0200
        Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-17 19:00 +0200
          Re: [GIT PULL] x86 fixes Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-17 19:20 +0200
            Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-18 00:20 +0200
              Re: [GIT PULL] x86 fixes Ingo Molnar <mingo@kernel.org> - 2015-08-19 08:00 +0200
                Re: [GIT PULL] x86 fixes Ingo Molnar <mingo@kernel.org> - 2015-08-19 08:20 +0200
                Re: [GIT PULL] x86 fixes Ingo Molnar <mingo@kernel.org> - 2015-08-19 09:00 +0200
                Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-19 12:10 +0200
            Re: [GIT PULL] x86 fixes Bryan O'Donoghue <pure.logic@nexus-software.ie> - 2015-08-18 01:50 +0200
      Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-17 23:10 +0200
      Re: [GIT PULL] x86 fixes Andy Lutomirski <luto@amacapital.net> - 2015-08-18 02:00 +0200
        Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-18 02:10 +0200
        Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-18 02:10 +0200
          Re: [GIT PULL] x86 fixes Andy Lutomirski <luto@amacapital.net> - 2015-08-18 02:20 +0200
            Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-18 08:00 +0200
            Re: [GIT PULL] x86 fixes "H. Peter Anvin" <hpa@zytor.com> - 2015-08-18 08:10 +0200
        Re: [GIT PULL] x86 fixes Ingo Molnar <mingo@kernel.org> - 2015-08-18 10:00 +0200

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