Dose clang support armv4

[Mori Hiroki]

Hi

I use ZRouter build system and make arm-boot image.

I add to armv4 setting ZRouter.

Also I make change to mov from bx instruction at this 
directory assembly code.

secure/lib/libcrypto/arm/
contrib/compiler-rt/lib/builtins/arm/

I checked bx instruction at kernel and init binary.

There is nothing. It's right armv4 binary.

If dts have bad geom_flashmap infomation then
hang up at pause() at vfs_mountroot.c.
This time can't use break.

I think nearly close...

Hiroki Mori

----- Original Message -----
> From: Ian Lepore <ian at freebsd.org>
> To: Mori Hiroki <yamori813 at yahoo.co.jp>; Warner Losh <imp at bsdimp.com>
> Cc: "freebsd-arm at freebsd.org" <freebsd-arm at freebsd.org>
> Date: 2018/3/14, Wed 08:14
> Subject: Re: Dose clang support armv4
> 
> On Tue, 2018-03-13 at 15:28 +0900, Mori Hiroki wrote:
>>  Hi
>> 
>>  Thanks for reply.
>> 
>>  I'm sorry last log is missing geom_flashmap dts entry.
>> 
>>  I use to cfi rootfs.
>> 
>> 
>>  Now rootfs mount and execute init.
>> 
>>  https://gist.github.com/yamori813/ae047a28a825aac255e436fd8ccaf785
>> 
>> 
> 
> I think clang defaults to armv4t if the arch is just 'arm'.  You should
> be able to fix this by building everything with CPUTYPE=armv4.  Put
> that in your make.conf file.  If you are doing a cross build do not put
> it in your main /etc/make.conf, instead create another file somewhere,
> and add this to the make command line when you crossbuild:  
> __MAKE_CONF=/somewhere/make.conf 
> 
> You will have to rebuild everything (make clean).
> 
> -- Ian
> 
>>  init is broken at armv4. 
>> 
>>  I checked init is not use arm4t instrauction(bx).
>> 
>>  I seem crt problem on armv4.
>> 
>>  BTW I post review geom_flashmap scan capability.
>>  This is same as geom_map capability.
>> 
>>  https://reviews.freebsd.org/D13648
>> 
>> 
>>  This is ad hoc method. But It's useful for flash file system. 
>> 
>>  Thanks
>> 
>>  Hiroki Mori
>> 
>>  ----- Original Message -----
>>  > 
>>  > From: Ian Lepore <ian at freebsd.org>
>>  > To: Warner Losh <imp at bsdimp.com>; Mori Hiroki 
> <yamori813 at yahoo.co.j
>>  > p>
>>  > Cc: "freebsd-arm at freebsd.org" 
> <freebsd-arm at freebsd.org>
>>  > Date: 2018/3/13, Tue 02:41
>>  > Subject: Re: Dose clang support armv4
>>  > 
>>  > On Mon, 2018-03-12 at 10:43 -0600, Warner Losh wrote:
>>  > > 
>>  > >  Hi Mori-san,
>>  > > 
>>  > >  I've not tried my armv4 boards with clang 6 yet.
>>  > > 
>>  > >  However, you are hanging in mountroot. What's normally 
> printed
>>  > > there?
>>  > >  Ian
>>  > >  just did some things to fix it for USB ad ZFS. Maybe that broke
>>  > > this
>>  > >  use
>>  > >  case accidentally.
>>  > > 
>>  > >  Warner
>>  > > 
>>  > Unfortunately, my only armv4/5 system that's anywhere close to
>>  > bootable
>>  >  right now is a Dreamplug, and it also hangs at mountroot, but for
>>  > a
>>  > different reason: somehow its ethernet driver gets a continuous 
> "RX
>>  > error" interrupt storm (and my rootfs is on nfs).  I haven't 
> had
>>  > time
>>  > to try putting together a rootfs on sdcard or sata to see if it
>>  > boots
>>  > all the way.
>>  > 
>>  > -- Ian
>>  > 
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>