Hi
We generate the map-file, the content tells that (if I understand correctly)
"_divdi3.o" use "__aeabi_unwind_cpp_pr0" which resides in "unwind-arm.o".
Is it really correct that we need unwind-support if just using division?
Could it be that _divdi3 can 'throw' division-by-zero 'exception' ?
(We have overloaded div0: "void __div0(void) { assert(0); }" so we dont want unwinding here anyway...)
If I declare this symbol myself in a file as
char __aeabi_unwind_cpp_pr0[0];
the binary links successfully, but I'm not sure its 100% working and correct.
(I have some problems with crashes on the new built eabi target, but could also be other reasons.)
----------------MAP FILE----------------
Archive member included because of file (symbol)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_thumb1_case_uqi.o)
../../../build/sniffer2/datetime_utils.o (__gnu_thumb1_case_uqi)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_thumb1_case_uhi.o)
../../../build/sniffer2/radio_cc110x.o (__gnu_thumb1_case_uhi)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_udivsi3.o)
../../../build/sniffer2/printf.o (__aeabi_uidiv)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_divsi3.o)
../../../build/sniffer2/app_start.o (__aeabi_idiv)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_dvmd_tls.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_udivsi3.o) (__aeabi_idiv0)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_aeabi_ldivmod.o)
../../../build/sniffer2/91x_uart.o (__aeabi_ldivmod)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_aeabi_uldivmod.o)
../../../build/sniffer2/sleep.o (__aeabi_uldivmod)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_muldi3.o)
../../../build/sniffer2/sleep.o (__aeabi_lmul)
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/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o) (restore_core_regs)
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/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o) (__gnu_unwind_execute)
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/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_divdi3.o) (__clzsi2)
-------------//...//-------------
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.debug_aranges
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.debug_aranges
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.debug_aranges
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-------------//...//-------------
*fill* 0x00008852 0x2 00
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0x00008bfe _Unwind_VRS_Get
0x00008c4c _Unwind_VRS_Set
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0x00008f2e __aeabi_unwind_cpp_pr1
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0x00009742 _Unwind_GetTextRelBase
-------------//...//-------------
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0xd8 (size before relaxing)
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0x48 (size before relaxing)
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-------------//...//-------------
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-------------//...//-------------
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-------------//...//-------------
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-------------//...//-------------
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-------------//...//-------------
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/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Restore_VFP_D /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Restore_VFP_D_16_to_31 /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Restore_WMMXC /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Restore_WMMXD /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Resume /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
__gnu_Unwind_Resume_or_Rethrow /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
__gnu_Unwind_Save_VFP /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Save_VFP_D /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Save_VFP_D_16_to_31 /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Save_WMMXC /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_Unwind_Save_WMMXD /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_ldivmod_helper /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(bpabi.o)
-------------//...//-------------
__gnu_thumb1_case_uqi /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(_thumb1_case_uqi.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_unwind_execute /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(pr-support.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
__gnu_unwind_frame /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(pr-support.o)
__restore_core_regs /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
abort /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(pr-support.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
memcpy /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
restore_core_regs /usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(libunwind.o)
/usr/local/gcc/arm-elf-tools-4.7.0-eabi/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o)
-------------MAP FILE END-------------
Do you have any idea how to proceed?
Thanks!/Fredrik
-----Ian Lance Taylor <iant@xxxxxxxxxx> wrote: -----
To: Fredrik Hederstierna <fredrik.hederstierna@xxxxxxxxxxxxxxxxxxxx>
From: Ian Lance Taylor <iant@xxxxxxxxxx>
Date: 03/27/2012 03:30PM
Cc: gcc-help@xxxxxxxxxxx
Subject: Re: Bare metal ARM Cross compiler for arm-none-eabi target without libunwind?
Fredrik Hederstierna <fredrik.hederstierna@xxxxxxxxxxxxxxxxxxxx> writes:
> /usr/local/gcc/arm-elf-tools-4.7.0/lib/gcc/arm-none-eabi/4.7.0/thumb//libgcc.a(unwind-arm.o): In function `get_eit_entry':
You need to find out why unwind-arm.o is being included in your link.
You could easily remove it from libgcc.a, but that would just leave you
with some other undefined symbol. unwind-arm.o is only being pulled in
because it defines some symbol that your program refers to. What
symbol?
If you are using the GNU linker you can find out easily enough by adding
-Wl,-M to your link command. That will produce a map file. The first
part of the file will be a list starting with "Archive member included
because of file (symbol)". Look for the symbol that causes unwind-arm.o
to be included.
Ian
