[OpenBIOS] Some encountered issues when compiling openbios on a ppc64 host

[Blue Swirl]

On Tue, Jan 19, 2010 at 1:47 PM, Stefan Reinauer <stepan at coresystems.de> wrote:
> On 1/19/10 11:27 AM, Zhiyong Wu wrote:
>
> HI, openbios guys,
>
> Today i compiled openbios on my ppc64 box, encoutered some questions:
>
> [root at 945n03 openbios]# uname -a
> Linux 945n03 2.6.31.5-127.fc12.ppc64 #1 SMP Sat Nov 7 20:58:24 EST
> 2009 ppc64 ppc64 ppc64 GNU/Linux
>
> [root at 945n03 openbios]# rpm -qa | grep glibc
> glibc-2.11-2.ppc
> glibc-2.11-2.ppc64
> glibc-devel-2.11-2.ppc
> glibc-common-2.11-2.ppc
> glibc-headers-2.11-2.ppc
>
> [root at 945n03 openbios]# rpm -qa | grep gcc
> libgcc-4.4.2-7.fc12.ppc64
> gcc-4.4.2-7.fc12.ppc
> libgcc-4.4.2-7.fc12.ppc
> gcc-c++-4.4.2-7.fc12.ppc
> gcc-gfortran-4.4.2-7.fc12.ppc
>
> [root at 945n03 openbios]# gcc -v
> Using built-in specs.
> Target: ppc64-redhat-linux
> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
> --infodir=/usr/share/info
> --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap
> --enable-shared --enable-threads=posix --enable-checking=release
> --with-system-zlib --enable-__cxa_atexit
> --disable-libunwind-exceptions --enable-gnu-unique-object
> --enable-languages=c,c++,objc,obj-c++,java,fortran,ada
> --enable-java-awt=gtk --disable-dssi --enable-plugin
> --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
> --enable-libgcj-multifile --enable-java-maintainer-mode
> --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
> --disable-libjava-multilib --with-ppl --with-cloog --enable-secureplt
> --with-long-double-128 --build=ppc64-redhat-linux
> --target=ppc64-redhat-linux --with-cpu=default32
> Thread model: posix
> gcc version 4.4.2 20091027 (Red Hat 4.4.2-7) (GCC)
>
> [root at 945n03 openbios]# ./config/scripts/switch-arch ppc
> Configuring OpenBIOS on ppc64 for ppc
> ERROR: no powerpc cross-compiler found !
>
> When i run "setarch 32 bash", "switch-arch" can work well, but it
> fails to run "make"
>
> [root at 945n03 openbios]# uname -a
> Linux 945n03 2.6.31.5-127.fc12.ppc64 #1 SMP Sat Nov 7 20:58:24 EST
> 2009 ppc ppc ppc GNU/Linux
>
> [root at 945n03 openbios]# ./config/scripts/switch-arch ppc
> Configuring OpenBIOS on ppc for ppc
> Initializing build tree obj-ppc...ok.
> Creating target Makefile...ok.
> Creating config files...ok.
>
> Building OpenBIOS for ppc
> Building...error:
> /kvm/openbios/obj-ppc/../libc/string.c:499: undefined reference to
> `_restgpr_31_x'
> liblibc.a(vsprintf.o): In function `number':
> /kvm/openbios/obj-ppc/../libc/vsprintf.c:55: undefined reference to
> `_savegpr_19'
> /kvm/openbios/obj-ppc/../libc/vsprintf.c:145: undefined reference to
> `_restgpr_19_x'
> liblibc.a(vsprintf.o): In function `vsnprintf':
> /kvm/openbios/obj-ppc/../libc/vsprintf.c:158: undefined reference to
> `_savegpr_22'
> /kvm/openbios/obj-ppc/../libc/vsprintf.c:388: undefined reference to
> `_restgpr_22_x'
> libgcc.a(__divdi3.o): In function `__divdi3':
> /kvm/openbios/obj-ppc/../libgcc/__divdi3.c:8: undefined reference to
> `_savegpr_31'
> /kvm/openbios/obj-ppc/../libgcc/__divdi3.c:26: undefined reference to
> `_restgpr_31_x'
> libgcc.a(__udivmoddi4.o): In function `__udivmoddi4':
> /kvm/openbios/obj-ppc/../libgcc/__udivmoddi4.c:4: undefined reference
> to `_savegpr_26'
> /kvm/openbios/obj-ppc/../libgcc/__udivmoddi4.c:31: undefined reference
> to `_restgpr_26_x'
> make[1]: *** [openbios-qemu.elf] Error 1
> make[1]: Leaving directory `/kvm/openbios/obj-ppc'
> make: *** [build] Error 1
>
> Who can give me some advices?
>
>
> I think we need to add this somewhere... :
>
> ._savegpr_13:        stw r.13, -76(r.12)
> ._savegpr_14:        stw r.14, -72(r.12)
> ._savegpr_15:        stw r.15, -68(r.12)
> ._savegpr_16:        stw r.16, -64(r.12)
> ._savegpr_17:        stw r.17, -60(r.12)
> ._savegpr_18:        stw r.18, -56(r.12)
> ._savegpr_19:        stw r.19, -52(r.12)
> ._savegpr_20:        stw r.20, -48(r.12)
> ._savegpr_21:        stw r.23, -44(r.12)
> ._savegpr_22:        stw r.23, -40(r.12)
> ._savegpr_23:        stw r.23, -36(r.12)
> ._savegpr_24:        stw r.23, -32(r.12)
> ._savegpr_25:        stw r.23, -28(r.12)
> ._savegpr_26:        stw r.23, -24(r.12)
> ._savegpr_27:        stw r.23, -20(r.12)
> ._savegpr_28:        stw r.23, -16(r.12)
> ._savegpr_29:        stw r.23, -12(r.12)
> ._savegpr_30:        stw r.33, -8(r.12)
> ._savegpr_31:        stw r.33, -4(r.12)
>                      blr
>
> ._restgpr_13:        lwz r.13, -76(r.12)
> ._restgpr_14:        lwz r.14, -72(r.12)
> ._restgpr_15:        lwz r.15, -68(r.12)
> ._restgpr_16:        lwz r.16, -64(r.12)
> ._restgpr_17:        lwz r.17, -60(r.12)
> ._restgpr_18:        lwz r.18, -56(r.12)
> ._restgpr_19:        lwz r.19, -52(r.12)
> ._restgpr_20:        lwz r.20, -48(r.12)
> ._restgpr_21:        lwz r.23, -44(r.12)
> ._restgpr_22:        lwz r.23, -40(r.12)
> ._restgpr_23:        lwz r.23, -36(r.12)
> ._restgpr_24:        lwz r.23, -32(r.12)
> ._restgpr_25:        lwz r.23, -28(r.12)
> ._restgpr_26:        lwz r.23, -24(r.12)
> ._restgpr_27:        lwz r.23, -20(r.12)
> ._restgpr_28:        lwz r.23, -16(r.12)
> ._restgpr_29:        lwz r.23, -12(r.12)
> ._restgpr_30:        lwz r.33, -8(r.12)
> ._restgpr_31:        lwz r.33, -4(r.12)
>                      blr
>
> But frankly, the better solution would be to drop our libgcc copy and use
> that of gcc again... It was a design mistake to let our own copy sneak in.

I disagree. Having our own libgcc makes OpenBIOS independent of any
installed libc headers of the host. You can also use target-elf/-eabi
cross-compilers, which are easier to build than for example
target-linux. At least for Sparc32/64, the administrative burden has
not been very big, though I don't know about PPC.

This is the same approach as taken by Linux.