Re: [XenARM] How to compile the unstable source for arm at sstabellini/xen-unstable.git/.git

[Jenny Smith <smithjenny183@xxxxxxxxx>]

For me the only way to get it working was to explicitly add
-fno-exceptions to the arm Rules.mk and then compiling and running Xen
worked.

diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
index 336e209..77250e5 100644
--- a/xen/arch/arm/Rules.mk
+++ b/xen/arch/arm/Rules.mk
@@ -12,6 +12,7 @@ CFLAGS += -I$(BASEDIR)/include

 # Prevent floating-point variables from creeping into Xen.
 CFLAGS += -msoft-float
+CFLAGS += -fno-exceptions -fno-unwind-tables

 $(call cc-options-add,CFLAGS,CC,$(EMBEDDED_EXTRA_CFLAGS))
 $(call cc-option-add,CFLAGS,CC,-Wnested-externs)


Jenny



On Tue, Feb 7, 2012 at 1:19 PM, Tim Deegan <tim@xxxxxxx> wrote:
> At 20:31 +0800 on 07 Feb (1328646671), Frank, Chen wrote:
>> Hi all,
>>
>>
>> I succeed in compiling the unstable source for arm at 
>> sstabellini/xen-unstable.git/.git with a little modification of 
>> xen/arch/arm/Makefile by the latest arm-none-linux-gnueabi- compiler from 
>> code sourcery.
>>
>>
>> - The URL for the latest cross compiler:
>> https://sourcery.mentor.com/sgpp/lite/arm/portal/package9728/public/arm-none-linux-gnueabi/arm-2011.09-70-arm-none-linux-gnueabi-i686-pc-linux-gnu.tar.bz2
>>
>>
>> - Compiling command : XEN_TARGET_ARCH=arm 
>> CROSS_COMPILE=arm-none-linux-gnueabi make xen
>>
>> - The patch is the following:
>> diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
>> index 9bc2fc8..244a19f 100644
>> --- a/xen/arch/arm/Makefile
>> +++ b/xen/arch/arm/Makefile
>> @@ -51,15 +51,15 @@ $(BASEDIR)/common/symbols-dummy.o:
>>         $(MAKE) -f $(BASEDIR)/Rules.mk -C $(BASEDIR)/common symbols-dummy.o
>>
>>  $(TARGET)-syms: prelink.o xen.lds $(BASEDIR)/common/symbols-dummy.o
>> -       $(LD) $(LDFLAGS) -T xen.lds -N prelink.o \
>> +       $(LD) $(LDFLAGS) -T xen.lds -r prelink.o \
>>             $(BASEDIR)/common/symbols-dummy.o -o $(@D)/.$(@F).0
>>         $(NM) -n $(@D)/.$(@F).0 | $(BASEDIR)/tools/symbols >$(@D)/.$(@F).0.S
>>         $(MAKE) -f $(BASEDIR)/Rules.mk $(@D)/.$(@F).0.o
>> -       $(LD) $(LDFLAGS) -T xen.lds -N prelink.o \
>> +       $(LD) $(LDFLAGS) -T xen.lds -r prelink.o \
>>             $(@D)/.$(@F).0.o -o $(@D)/.$(@F).1
>>         $(NM) -n $(@D)/.$(@F).1 | $(BASEDIR)/tools/symbols >$(@D)/.$(@F).1.S
>>         $(MAKE) -f $(BASEDIR)/Rules.mk $(@D)/.$(@F).1.o
>> -       $(LD) $(LDFLAGS) -T xen.lds -N prelink.o \
>> +       $(LD) $(LDFLAGS) -T xen.lds -r prelink.o \
>>             $(@D)/.$(@F).1.o -o $@
>>         rm -f $(@D)/.$(@F).[0-9]*
>
> That may link successfully but I'd be surprised if it runs.  You're
> building a relocatable object instead of an executable binary.  If you
> check your output file you'll probably find that it's still got an
> unresolved symbol '__aeabi_unwind_cpp_pr1' in it.
>
> The real problem is that whatever compiler you're using is expecting
> this __aeabi_unwind_cpp_pr1() helper function to exist and it doesn't.
>
> IIUC, __aeabi_unwind_cpp_pr1() is part ofthe C++ exception-handling
> code, so it's surprising to see it linked from Xen code!  You coud try
> adding -fno-exceptions to the CFLAGS in config/arm.mk
>
> For the record, GCC 4.6.2 arm-linux-gnueabihf compiles Xen without this
> error for me.
>
> Tim.
>
>>
>>
>> - Without applying this patch, the compiling will output the following error.
>> ---
>> make[4]: Leaving directory 
>> `/home/frank/workspace/xen/src/xen-arm-v6/xen/common'
>> arm-none-linux-gnueabi-ld    -marmelf_linux_eabi  -T xen.lds -N prelink.o \
>>    /home/frank/workspace/xen/src/xen-arm-v6/xen/common/symbols-dummy.o -o 
>> /home/frank/workspace/xen/src/xen-arm-v6/xen/.xen-syms.0
>> prelink.o:(.ARM.exidx.init.text+0x0): undefined reference to 
>> `__aeabi_unwind_cpp_pr1'
>
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