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[Qemu-devel] [Bug 1725267] Re: armeb regression since qemu version 2.8

From: Christophe Lyon
Subject: [Qemu-devel] [Bug 1725267] Re: armeb regression since qemu version 2.8
Date: Tue, 07 Nov 2017 20:55:49 -0000

Great, thanks!

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  armeb regression since qemu version 2.8

Status in QEMU:
  Fix Committed

Bug description:

  I have noticed a regression when I upgraded from qemu-armeb 2.7 to
  2.8, and the problem is still present with version 2.10.1.

  I am using qemu for GCC validation, noticed problems with testcases
  involving atomics, I'm attaching here atomic-exchange-4.exe.

  # with 2.7:
  $ qemu-armeb -cpu any -R 0 -L $PWD -E LD_LIBRARY_PATH=$PWD/lib 
  $ echo $?
  # with 2.8, 2.10.1:
  $ qemu-armeb -cpu any -R 0 -L $PWD -E LD_LIBRARY_PATH=$PWD/lib 
  qemu: uncaught target signal 6 (Aborted) - core dumped
  Aborted (core dumped)
  $ echo $?

  The source code is gcc/testsuite/gcc.dg/atomic-exchange-4.c

  Running with -d in_asm shows a difference early in the startup code:
  IN: _dl_sysdep_start
  0x40a17790:  908ff103      addls      pc, pc, r3, lsl #2

  and then the next address is not the same with qemu 2.7 and 2.10.1

  I hope you have enough data/information to reproduce and confirm/fix
  the problem.


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