[Qemu-commits] [qemu/qemu] ba5c79: target-mips: indicate presence of IEEE 754-2008 FP...

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: ba5c79f26221c0fd7139c883a34a4e75d993f732
      
https://github.com/qemu/qemu/commit/ba5c79f26221c0fd7139c883a34a4e75d993f732
  Author: Leon Alrae <address@hidden>
  Date:   2016-03-23 (Wed, 23 Mar 2016)

  Changed paths:
    M target-mips/cpu.h
    M target-mips/translate.c
    M target-mips/translate_init.c

  Log Message:
  -----------
  target-mips: indicate presence of IEEE 754-2008 FPU in R6/R5+MSA CPUs

MIPS Release 6 and MIPS SIMD Architecture make it mandatory to have IEEE
754-2008 FPU which is indicated by CP1 FIR.HAS2008, FCSR.ABS2008 and
FCSR.NAN2008 bits set to 1.

In QEMU we still keep these bits cleared as there is no 2008-NaN support.
However, this now causes problems preventing from running R6 Linux with
the v4.5 kernel. Kernel refuses to execute 2008-NaN ELFs on a CPU
whose FPU does not support 2008-NaN encoding:

  (...)
  VFS: Mounted root (ext4 filesystem) readonly on device 8:0.
  devtmpfs: mounted
  Freeing unused kernel memory: 256K (ffffffff806f0000 - ffffffff80730000)
  request_module: runaway loop modprobe binfmt-464c
  Starting init: /sbin/init exists but couldn't execute it (error -8)
  request_module: runaway loop modprobe binfmt-464c
  Starting init: /bin/sh exists but couldn't execute it (error -8)
  Kernel panic - not syncing: No working init found.  Try passing init= option 
to kernel. See Linux Documentation/init.txt for guidance.

Therefore always indicate presence of 2008-NaN support in R6 as well as in
R5+MSA CPUs, even though this feature is not yet supported by MIPS in QEMU.

Signed-off-by: Leon Alrae <address@hidden>


  Commit: b7c4ab809a4bfde4ab322b49fbe2e47536da7487
      
https://github.com/qemu/qemu/commit/b7c4ab809a4bfde4ab322b49fbe2e47536da7487
  Author: Leon Alrae <address@hidden>
  Date:   2016-03-23 (Wed, 23 Mar 2016)

  Changed paths:
    A default-configs/mips-softmmu-common.mak
    M default-configs/mips-softmmu.mak
    M default-configs/mips64-softmmu.mak
    M default-configs/mips64el-softmmu.mak
    M default-configs/mipsel-softmmu.mak

  Log Message:
  -----------
  default-configs: add mips-softmmu-common.mak

Add mips-softmmu-common.mak and include it in existing mips*-softmmu.mak
files to avoid having to repeat CONFIG defines four times.

Suggested-by: Peter Maydell <address@hidden>
Signed-off-by: Leon Alrae <address@hidden>


  Commit: 10805344811f794647b0b28f7409b319d60a7d67
      
https://github.com/qemu/qemu/commit/10805344811f794647b0b28f7409b319d60a7d67
  Author: Peter Maydell <address@hidden>
  Date:   2016-03-24 (Thu, 24 Mar 2016)

  Changed paths:
    A default-configs/mips-softmmu-common.mak
    M default-configs/mips-softmmu.mak
    M default-configs/mips64-softmmu.mak
    M default-configs/mips64el-softmmu.mak
    M default-configs/mipsel-softmmu.mak
    M target-mips/cpu.h
    M target-mips/translate.c
    M target-mips/translate_init.c

  Log Message:
  -----------
  Merge remote-tracking branch 'remotes/lalrae/tags/mips-20160323' into staging

MIPS patches 2016-03-23

Changes:
* add mips-softmmu-common.mak
* indicate presence of IEEE 754-2008 FPU in MIPS64R6-generic and P5600

# gpg: Signature made Wed 23 Mar 2016 16:38:04 GMT using RSA key ID 0B29DA6B
# gpg: Good signature from "Leon Alrae <address@hidden>"

* remotes/lalrae/tags/mips-20160323:
  default-configs: add mips-softmmu-common.mak
  target-mips: indicate presence of IEEE 754-2008 FPU in R6/R5+MSA CPUs

Signed-off-by: Peter Maydell <address@hidden>


Compare: https://github.com/qemu/qemu/compare/4f57a35d8138...10805344811f