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[Qemu-ppc] Incorrect handling of more PPC64 insns

From: Torbjorn Granlund
Subject: [Qemu-ppc] Incorrect handling of more PPC64 insns
Date: Tue, 07 May 2013 12:27:33 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (berkeley-unix)

Alexander Graf <address@hidden> writes:

  There's a certain chance that happens, yes. We don't have instruction
  test suites for the PPC target.
There certainly are more bugs.  GMP still crashes all over the place.
I have semi-isolated one more.

Extracted stand-alone sources:

Attachment: bug-qemu-ppc-again.c
Description: Binary data

Asm code generated on gcc110 from the source file:

Attachment: bug-qemu-ppc-again.s
Description: Binary data

Generate executable and execute:

gcc -m32 -mpowerpc64 bug-qemu-ppc-again.s && ./a.out

This runs silently as it should on real hardware.  Under qemu (from
2013-05-02 plus the rldcl patch) I incorrectly get the error message:


This seems reproducible every time, unlike most qemu bugs that hit GMP.
I haven't isolated this bug to a single instruction, but if rldcl was
untested, expecting all of there here used rldicl rldimi rlwinm to be
tested is perhaps over-optimistic?


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