[Qemu-devel] [Bug 1590336] [NEW] qemu-arm does not reject vrintz on non-v8 cpu

[Qemu-devel] [Bug 1590336] [NEW] qemu-arm does not reject vrintz on non-v8 cpu

[Christophe Lyon]

Public bug reported:

Hello,

It seems that qemu-arm does not reject some v8-only instructions as it
should, but executes them "correctly".

For instance, while compiling/running some of the GCC ARM instrinsics tests, we noticed that
vrintz should be rejected on cortex-a9 for instance, while it is executed as if the instruction was supported.

objdump says:
   1074c:       f3fa05a0        vrintz.f32      d16, d16
and qemu -d in_asm says:
0x0001074c:  f3fa05a0      vabal.u<illegal width 64>    q8, d26, d16

The problem is still present in qemu-2.6.0

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  qemu-arm does not reject vrintz on non-v8 cpu

Status in QEMU:
  New

Bug description:
  Hello,

  It seems that qemu-arm does not reject some v8-only instructions as it
  should, but executes them "correctly".

  For instance, while compiling/running some of the GCC ARM instrinsics tests, we noticed that
  vrintz should be rejected on cortex-a9 for instance, while it is executed as if the instruction was supported.

  objdump says:
     1074c:       f3fa05a0        vrintz.f32      d16, d16
  and qemu -d in_asm says:
  0x0001074c:  f3fa05a0      vabal.u<illegal width 64>    q8, d26, d16

  The problem is still present in qemu-2.6.0

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[Qemu-devel] [Bug 1590336] Re: qemu-arm does not reject vrintz on non-v8 cpu

[Peter Maydell]

Should be fixed by http://patchwork.ozlabs.org/patch/633105/

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Title:
  qemu-arm does not reject vrintz on non-v8 cpu

Status in QEMU:
  New

Bug description:
  Hello,

  It seems that qemu-arm does not reject some v8-only instructions as it
  should, but executes them "correctly".

  For instance, while compiling/running some of the GCC ARM instrinsics tests, we noticed that
  vrintz should be rejected on cortex-a9 for instance, while it is executed as if the instruction was supported.

  objdump says:
     1074c:       f3fa05a0        vrintz.f32      d16, d16
  and qemu -d in_asm says:
  0x0001074c:  f3fa05a0      vabal.u<illegal width 64>    q8, d26, d16

  The problem is still present in qemu-2.6.0

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[Qemu-devel] [Bug 1590336] Re: qemu-arm does not reject vrintz on non-v8 cpu

[Christophe Lyon]

I confirm your patch does fix the problem.

You may still want to fix the disassembler such that it dumps the right
instruction, but that would be a separate fix.

Thanks for your quick support.

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Title:
  qemu-arm does not reject vrintz on non-v8 cpu

Status in QEMU:
  New

Bug description:
  Hello,

  It seems that qemu-arm does not reject some v8-only instructions as it
  should, but executes them "correctly".

  For instance, while compiling/running some of the GCC ARM instrinsics tests, we noticed that
  vrintz should be rejected on cortex-a9 for instance, while it is executed as if the instruction was supported.

  objdump says:
     1074c:       f3fa05a0        vrintz.f32      d16, d16
  and qemu -d in_asm says:
  0x0001074c:  f3fa05a0      vabal.u<illegal width 64>    q8, d26, d16

  The problem is still present in qemu-2.6.0

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Re: [Qemu-devel] [Bug 1590336] Re: qemu-arm does not reject vrintz on non-v8 cpu

[Peter Maydell]

On 9 June 2016 at 20:14, Christophe Lyon <christophe.lyon@linaro.org> wrote:
> You may still want to fix the disassembler such that it dumps the right
> instruction, but that would be a separate fix.

Unfortunately the disassembler is the pre-GPLv3 binutils one,
so we can't just update it (and I'm not particularly inclined
to independently re-implement all the 32-bit instruction set
changes post that change).

thanks
-- PMM

[Qemu-devel] [Bug 1590336] Re: qemu-arm does not reject vrintz on non-v8 cpu

[Peter Maydell]

** Changed in: qemu
       Status: New => Fix Committed

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Title:
  qemu-arm does not reject vrintz on non-v8 cpu

Status in QEMU:
  Fix Committed

Bug description:
  Hello,

  It seems that qemu-arm does not reject some v8-only instructions as it
  should, but executes them "correctly".

  For instance, while compiling/running some of the GCC ARM instrinsics tests, we noticed that
  vrintz should be rejected on cortex-a9 for instance, while it is executed as if the instruction was supported.

  objdump says:
     1074c:       f3fa05a0        vrintz.f32      d16, d16
  and qemu -d in_asm says:
  0x0001074c:  f3fa05a0      vabal.u<illegal width 64>    q8, d26, d16

  The problem is still present in qemu-2.6.0

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[Qemu-devel] [Bug 1590336] Re: qemu-arm does not reject vrintz on non-v8 cpu

[Thomas Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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Title:
  qemu-arm does not reject vrintz on non-v8 cpu

Status in QEMU:
  Fix Released

Bug description:
  Hello,

  It seems that qemu-arm does not reject some v8-only instructions as it
  should, but executes them "correctly".

  For instance, while compiling/running some of the GCC ARM instrinsics tests, we noticed that
  vrintz should be rejected on cortex-a9 for instance, while it is executed as if the instruction was supported.

  objdump says:
     1074c:       f3fa05a0        vrintz.f32      d16, d16
  and qemu -d in_asm says:
  0x0001074c:  f3fa05a0      vabal.u<illegal width 64>    q8, d26, d16

  The problem is still present in qemu-2.6.0

To manage notifications about this bug go to:
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