arm August 2011

arm@lists.fedoraproject.org

28 participants
76 discussions

Re: [fedora-arm] About arm choice of toolchain options
by Jon Masters 02 Aug '11

02 Aug '11

The doc writing is on my TODO. I am in Cambridge UK for the next two weeks but getting this going is a priority for me. -- Sent from my phone - message formatted and/or shortened accordingly. -----Original Message----- From: omalleys(a)msu.edu Received: Monday, 01 Aug 2011, 21:16 To: DJ Delorie [dj(a)redhat.com] CC: arm(a)lists.fedoraproject.org Subject: Re: [fedora-arm] About arm choice of toolchain options Quoting DJ Delorie <dj(a)redhat.com>: > >> I haven't looked at the docs in a while, but we are most likely going >> to need this again in the distant future. Plus the fact it seems to >> come up all the time. > > One of the things I'm hoping we get out of this is an official fully > automated way to bootstrap, make it fast, and do it often. Then it > will always be there when we need it. > That would be entirely useful. :P Im still liking the idea of documentation. I think there are a lot of people that don't understand the whole process especially the why + how. _______________________________________________ arm mailing list arm(a)lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/arm

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Re: [fedora-arm] Configuring mock
by Jon Masters 02 Aug '11

02 Aug '11

I asked one of the Red Hat guys to look into fixing this in the rootfs so mock works. I can get to this but am at the Linaro event in Cambridge currently. I would also accept a pull request with fixes from anyone else who has time :) -- Sent from my phone - message formatted and/or shortened accordingly. -----Original Message----- From: Dennis Gilmore [dennis(a)ausil.us] Received: Monday, 01 Aug 2011, 19:03 To: arm(a)lists.fedoraproject.org Subject: Re: [fedora-arm] Configuring mock On Monday, August 01, 2011 12:40:41 PM DJ Delorie wrote: > > It now fails with that silly FileCaps problem from before, so > > clearly either rpm of glibc-common need updating. > > That's an rpm feature that glibc.spec needs: > > %attr(755,root,root) %caps(cap_chown,cap_fowner=pe) > %{_prefix}/libexec/pt_chown it needs a rpm thats been built with a stage3 built elfutils, it gives rpm the correct provides. Dennis

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About arm choice of toolchain options
by Paulo César Pereira de Andrade 02 Aug '11

02 Aug '11

Hi, Sorry for the cross post and long email :-) Currently I am working on a very initial state build of Mandriva for arm. Thanks to Jeff Johnson for giving me ssh access to armv7 hosts, and Matthew Dawkins for building several Mandriva/Unity linux armv5 packages. What I am trying to understand now is about choice of float abi. I understand that the IHI0042D_aapcs.pdf file I donwload says to use vfp registers for float/double arguments, but softfp seems too good to miss, as armv5 should be around for some time yet. So, I have two chroots, running: softfp# gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/armv7l-mandriva-linux-gnueabi/4.6.1/lto-wrapper Target: armv7l-mandriva-linux-gnueabi Configured with: /home/pcpa/bootstrap/rpmbuild/BUILD/gcc-4.6-20110722/configure --prefix=/usr --build=i586-mandriva-linux-gnu --host=armv7l-mandriva-linux-gnueabi --target=armv7l-mandriva-linux-gnueabi --enable-werror=no --enable-cxx --with-cpu=cortex-a8 --with-tune=cortex-a8 --with-arch=armv7-a --with-float=softfp --with-fpu=vfpv3-d16 --with-abi=aapcs-linux --enable-languages=c,c++ --enable-threads=posix --disable-libssp --disable-libmudflap Thread model: posix gcc version 4.6.1 20110722 (Mandriva) (GCC) thumb# gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/armv7l-mandriva-linux-gnueabi/4.6.1/lto-wrapper Target: armv7l-mandriva-linux-gnueabi Configured with: /home/pcpa/bootstrap/rpmbuild/BUILD/gcc-4.6-20110722/configure --prefix=/usr --build=i586-mandriva-linux-gnu --host=armv7l-mandriva-linux-gnueabi --target=armv7l-mandriva-linux-gnueabi --enable-werror=no --enable-cxx --with-cpu=cortex-a8 --with-tune=cortex-a8 --with-arch=armv7-a --with-mode=thumb --with-float=hard --with-fpu=vfpv3-d16 --with-abi=aapcs-linux --enable-languages=c,c++ --enable-threads=posix --disable-libssp --disable-libmudflap Thread model: posix gcc version 4.6.1 20110722 (Mandriva) (GCC) This is unmodified upstream gcc, and using a set of bootstrap scripts from a git branch I made on a checkout of git clone git://fedorapeople.org/~djdelorie/bootstrap.git Since I am still very "arm noob" :-) and just yesterday did the thumb build to learn about thumb, so far, my impression is that the best approach should be to use thumb+softfp. Just so you know I am running thumb and arm builds, with thumb using hard float and the softfp with arm instructions set: softfp# objdump -d /usr/lib/libm.so | less [...] 00008d30 <__ieee754_atan2>: 8d30: e3a0c000 mov ip, #0 8d34: e347cff0 movt ip, #32752 ; 0x7ff0 8d38: e92d4030 push {r4, r5, lr} 8d3c: ed2d8b10 vpush {d8-d15} 8d40: e3a05000 mov r5, #0 8d44: ec432b18 vmov d8, r2, r3 8d48: e3475ff0 movt r5, #32752 ; 0x7ff0 8d4c: e003c00c and ip, r3, ip 8d50: e15c0005 cmp ip, r5 8d54: e24dd02c sub sp, sp, #44 ; 0x2c 8d58: e1a04003 mov r4, r3 8d5c: ec410b19 vmov d9, r0, r1 8d60: e1a05002 mov r5, r2 8d64: 0a000022 beq 8df4 <__ieee754_atan2+0xc4> [...] thumb# objdump -d /usr/lib/libm.so | less [...] 00007884 <__ieee754_atan2>: 7884: 2100 movs r1, #0 7886: 2000 movs r0, #0 7888: f6c7 71f0 movt r1, #32752 ; 0x7ff0 788c: ec53 2b11 vmov r2, r3, d1 7890: f6c7 70f0 movt r0, #32752 ; 0x7ff0 7894: 4019 ands r1, r3 7896: 4281 cmp r1, r0 7898: e92d 03f0 stmdb sp!, {r4, r5, r6, r7, r8, r9} 789c: ed2d 8b10 vpush {d8-d15} 78a0: 461c mov r4, r3 78a2: b08a sub sp, #40 ; 0x28 78a4: eeb0 8b41 vmov.f64 d8, d1 78a8: 4616 mov r6, r2 78aa: eeb0 9b40 vmov.f64 d9, d0 78ae: d03c beq.n 792a <__ieee754_atan2+0xa6> [...] I am kind of trying to figure what "The Industry" says about it, and just checked the linaro gcc-4.6 relevant changes for me right now, that are... + --with-arch=armv7-a --with-tune=cortex-a8 \ + --with-float=$(float_abi) --with-fpu=neon \ +# check if we're building for armel or armhf +ifeq ($(DEB_TARGET_ARCH),armhf) + float_abi := hard +else ifneq (,$(filter $(DEB_TARGET_ARCH), arm armel)) + float_abi := softfp +endif If I understand correctly, neon will have better support for simd instructions right? Either way, I used two simple benchmarks to try to sell myself the idea of breaking compatibility with armv5 or older binaries, but still not convinced, but, as I said, we should use whatever "The Industry" chooses :-) I used for benchmark http://www.tux.org/~mayer/linux/bmark.html and http://www.linuxfordevices.com/c/a/Linux-For-Devices-Articles/Why-ARMs-EABI… and also compared with my home computer (quad)core i5 x86_64, and attached results... Thanks and again sorry for cross posting and long email, Paulo

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Configuring mock
by Jon Masters 01 Aug '11

01 Aug '11

Dennis, I suspect I just need a few hours doing something else (like sleeping), but I hit a small bump configuring mock. I can see that you use several repos - including on i386 for group deps (cool). However, my mock refuses to recognize the Scotland armv7hl repo. I will look at it in a few hours, should be easy to fix but just annoying. If you have something I don't, like a patch to mock, let me know. Jon. -- Sent from my phone - message formatted and/or shortened accordingly.

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ARM: Add .cantunwind to __clone
by Andrew Haley 01 Aug '11

01 Aug '11

Backtraces crash on F15 ARM, which breaks gcj and perhaps a ton of other stuff too. I've written a patch which is at http://sourceware.org/ml/libc-ports/2011-08/msg00000.html Andrew.

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Fedora 14 RPM Compiles - Perl
by Donald Gullett 01 Aug '11

01 Aug '11

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arm August 2011