[Bug 1926202] Re: qemu-user can't run some ppc binaries

[Laurent Vivier]

This is not a regression (reproduced with 5.2 and 5.1)

  IN: strlen
  0x1000d780:  7d2a03f8  cmpb     r10, r9, r0

  OP:
   ld_i32 tmp0,env,$0xfffffffffffffff0
   brcond_i32 tmp0,$0x0,lt,$L0

   ---- 1000d780
   mov_i32 nip,$0x1000d780
   mov_i32 tmp0,$0x60
   mov_i32 tmp4,$0x21
   call raise_exception_err,$0x2,$0,env,tmp0,tmp4
   exit_tb $0x0
   set_label $L0
   exit_tb $0x7efd50022283

"cmpb" is define in ISA 2.05, but qemu-ppc (32bit) defines by default a
PowerPC 750 that is not ISA 2.05.

It doesn't seem QEMU supports ISA 2.05 for any 32bit PowerPC (only
POWER7 and above, that are 64bit processors).

** Tags removed: linux-user

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https://bugs.launchpad.net/bugs/1926202

Title:
  qemu-user can't run some ppc binaries

Status in QEMU:
  New

Bug description:
  qemu-user v6.0.0-rc5, built in static mode, will crash for certain ppc
  binaries.  It seems to have something to do with glibc for some Centos
  versions.  The problem is easiest to see with statically-linked
  binaries.

  The attached Dockerfile shows how to produce a ppc binary that will
  crash qemu-user.  Here is how to reproduce the problem:

  $ uname -m
  x86_64

  $ docker run --rm --privileged multiarch/qemu-user-static --reset -p
  yes

  $ docker build -t qemu-bug:centos -f Dockerfile.centos .

  $ docker run --rm -it -v$PWD:$PWD -w$PWD qemu-bug:centos cp
  /helloworld-centos.static.ppc .

  $ qemu-ppc-static --version
  qemu-ppc version 5.2.95 (v6.0.0-rc5)
  Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

  $ qemu-ppc-static ./helloworld-centos.static.ppc
  emu: uncaught target signal 4 (Illegal instruction) - core dumped
  [1]    16678 illegal hardware instruction (core dumped)  qemu-ppc-static 
./helloworld-centos.static.ppc

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