Re: [Qemu-devel] [PATCH v1 00/17] ARM big-endian and setend support

[Peter Crosthwaite]

On Tue, Mar 1, 2016 at 1:34 PM, Andrew Baumann
<address@hidden> wrote:
>> From: Peter Crosthwaite [mailto:address@hidden
>> Sent: Tuesday, 1 March 2016 10:44 AM
>>
>> On Mon, Feb 29, 2016 at 9:27 PM, Stefan Weil <address@hidden> wrote:
>> > Am 18.01.2016 um 08:12 schrieb Peter Crosthwaite:
>> >> Hi All,
>> >>
>> >> This patch series adds system-mode big-endian support for ARM. It also
>> >> implements the setend instruction, and loading of BE binaries even in
>> >> LE emulation mode.
>> >>
>> >> Based on Paolo's original work. I have moved all the BE32 related work
>> >> to the back of the series. Multiple parties are interested in the BE8
>> >> work just on its own, so that could potentially be merged w/o BE32.
>> >> PMM requested BE32 be at least thought out architecturally, so this
>> >> series sees BE32 functionality through.
>> >>
>> >> I have tested all of LE. BE8 and BE32 in both linux-user mode (for
>> >> regressions) and system mode (BE8 and BE32 are new here).
>> >> My test application is here, the README gives some example command
>> >> lines you can run:
>> >>
>> >> https://github.com/pcrost/arm-be-test
>> >>
>> >> Regards,
>> >> Peter
>> >
>> > It would be nice to get at least the emulation for 'setend' into the
>> > next version, because it is needed for the Raspberry Pi emulation.
>> >
>>
>> BTW if you can link me binaries and a failing command line for the
>> failing rPI work I can test it, I am currently doing my own standalone
>> tests (of linux user as well).
>
> Download and unzip:
> https://downloads.raspberrypi.org/raspbian_lite_latest
>
> Then, mount the boot partition, and grab a copy of kernel7.img. You should 
> now be able to boot on a current qemu with:
>
> qemu-system-arm -M raspi2 -kernel kernel7.img -sd 
> 2016-02-26-raspbian-jessie-lite.img -append "rw earlyprintk loglevel=8 
> console=ttyAMA0 root=/dev/mmcblk0p2 rootwait" -serial stdio -d unimp
>
> At present, this fails with:
>
> [   10.535232] VFS: Mounted root (ext4 filesystem) on device 179:2.
> [   10.729685] devtmpfs: mounted
> [   10.805125] Freeing unused kernel memory: 416K (80776000 - 807de000)
> [   17.317286] random: systemd urandom read with 6 bits of entropy available
> arm: unimplemented setend
> [   17.366656] Kernel panic - not syncing: Attempted to kill init! 
> exitcode=0x00000004
> [   17.366656]
> [   17.384625] CPU: 0 PID: 1 Comm: systemd Not tainted 4.1.7-v7+ #817
> [   17.395562] Hardware name: BCM2709
> [   17.404738] [<80018440>] (unwind_backtrace) from [<80013e0c>] 
> (show_stack+0x20/0x24)
> [   17.419042] [<80013e0c>] (show_stack) from [<80558548>] 
> (dump_stack+0x98/0xe0)
> [   17.432237] [<80558548>] (dump_stack) from [<8055473c>] (panic+0xa4/0x204)
> [   17.444761] [<8055473c>] (panic) from [<8002937c>] (do_exit+0xa0c/0xa64)
> [   17.452507] [<8002937c>] (do_exit) from [<80029470>] 
> (do_group_exit+0x50/0xcc)
> [   17.462827] [<80029470>] (do_group_exit) from [<80033ed4>] 
> (get_signal+0x2b0/0x6e0)
> [   17.474429] [<80033ed4>] (get_signal) from [<80013194>] 
> (do_signal+0x98/0x3ac)
> [   17.482176] [<80013194>] (do_signal) from [<80013690>] 
> (do_work_pending+0xb8/0xc8)
> [   17.490129] [<80013690>] (do_work_pending) from [<8000f9e4>] 
> (work_pending+0xc/0x20)
> [   17.501020] ---[ end Kernel panic - not syncing: Attempted to kill init! 
> exitcode=0x00000004
> [   17.501020]
>

Reproduced. With my patch series I am now getting further:

[    5.570600] VFS: Mounted root (ext4 filesystem) on device 179:2.
[    5.628967] devtmpfs: mounted
[    5.667292] Freeing unused kernel memory: 448K (8078a000 - 807fa000)
[    7.829100] random: systemd urandom read with 2 bits of entropy available
[    7.902604] systemd[1]: systemd 215 running in system mode. (+PAM
+AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ
-SECCOMP -APPARMOR)
[    7.913866] systemd[1]: Detected architecture 'arm'.

Welcome to Raspbian GNU/Linux 8 (jessie)!

[    8.625874] NET: Registered protocol family 10
[    8.645330] systemd[1]: Inserted module 'ipv6'
[    8.671989] systemd[1]: Set hostname to <raspberrypi>.
[   12.670915] systemd[1]: Cannot add dependency job for unit
display-manager.service, ignoring: Unit display-manager.service failed
to load: No such file or directory.
[   12.720439] systemd[1]: Starting Forward Password Requests to Wall
Directory Watch.
[   12.731310] systemd[1]: Started Forward Password Requests to Wall
Directory Watch.
[   12.734406] systemd[1]: Expecting device dev-ttyAMA0.device...
         Expecting device dev-ttyAMA0.device...

...

[  OK  ] Started Permit User Sessions.
[  OK  ] Started Login Service.
[  OK  ] Started System Logging Service.
[  OK  ] Started LSB: Apply config from /boot/os_config.json.
[  OK  ] Started dhcpcd on all interfaces.
[  OK  ] Reached target Network.
         Starting /etc/rc.local Compatibility...
[  OK  ] Reached target Network is Online.
         Starting LSB: Start NTP daemon...
[  OK  ] Started /etc/rc.local Compatibility.
         Starting Wait for Plymouth Boot Screen to Quit...
         Starting Terminate Plymouth Boot Screen...
[  OK  ] Started Wait for Plymouth Boot Screen to Quit.
         Starting Getty on tty1...
[  OK  ] Started Getty on tty1.
         Starting Serial Getty on ttyAMA0...
[  OK  ] Started Serial Getty on ttyAMA0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Started Terminate Plymouth Boot Screen.

Raspbian GNU/Linux 8 raspberrypi ttyAMA0

raspberrypi login: pi
Password:
Linux raspberrypi 4.1.18-v7+ #846 SMP Thu Feb 25 14:22:53 GMT 2016 armv7l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
address@hidden:~$ cat /proc/cpuinfo
processor    : 0
model name    : ARMv7 Processor rev 1 (v7l)
BogoMIPS    : 38.40
Features    : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva
idivt vfpd32 lpae evtstrm
CPU implementer    : 0x41
CPU architecture: 7
CPU variant    : 0x2
CPU part    : 0xc0f
CPU revision    : 1

Hardware    : BCM2709
Revision    : 0000
Serial        : 0000000000000000
address@hidden:~$ uname -a
Linux raspberrypi 4.1.18-v7+ #846 SMP Thu Feb 25 14:22:53 GMT 2016
armv7l GNU/Linux

Regards,
Peter

> Cheers,
> Andrew