Linking Problems.

Lord Loh.

Prodigy 160 points

Hi,

This question is not specific to the OMAP. It is more of a C question

I am trying to link a few compiled object files into an ELF. These are the steps I am following

arm-none-eabi-gcc -S printf.c -o kprintf.s -I .

arm-none-eabi-gcc -S main.c -o main.s -I .

arm-none-eabi-as -mlittle-endian -o kprintf.o kprintf.s

arm-none-eabi-as -mlittle-endian -o main.o main.s

arm-none-eabi-ld -Ttext 0x80008000 -entry start_armboot --start-group main.o kprintf.o --end-group -L /usr/local/gcc-arm/lib/gcc/arm-none-eabi/4.5.2/ -o u-boot

and receive an error

kprintf.o: In function `number':

printf.c:(.text+0x3c8): undefined reference to `__aeabi_uidivmod'

printf.c:(.text+0x3e4): undefined reference to `__aeabi_uidiv'

Looking into the map of the xloader, I believe that the routines come from libgcc.a

.text 0x0000000040205528 0x114 /usr/local/gcc-arm/lib/gcc/arm-none-eabi/4.5.2/libgcc.a(_udivsi3.o)

0x0000000040205528 __udivsi3

0x0000000040205528 __aeabi_uidiv

0x000000004020561c __aeabi_uidivmod

.text 0x000000004020563c 0x148 /usr/local/gcc-arm/lib/gcc/arm-none-eabi/4.5.2/libgcc.a(_divsi3.o)

0x000000004020563c __aeabi_idiv

0x000000004020563c __divsi3

0x0000000040205764 __aeabi_idivmod

.text 0x0000000040205784 0x4 /usr/local/gcc-arm/lib/gcc/arm-none-eabi/4.5.2/libgcc.a(_dvmd_tls.o)

0x0000000040205784 __aeabi_ldiv0

0x0000000040205784 __aeabi_idiv0

What could I be doing wrong?

Thank you.

over 14 years ago

0 Sanjeev Premi over 14 years ago

TI__Expert 4590 points

Are you building u-boot?

Also it seems that you are using a custom built toolchain. Right?

Are you sure you are linking with libgcc? Try adding -lgcc to the "ld" command above.

If not found, provide path to the actual directory containing libgcc.a thru -L option.

0 Sanjeev Premi over 14 years ago in reply to Sanjeev Premi

TI__Expert 4590 points

You may also want to check this bugzilla (though status is unconfirmed):

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48783

0 Lord Loh. over 14 years ago in reply to Sanjeev Premi

Prodigy 160 points

I am trying to write my own stage II boot loader. It is a sort of an exercise and is being written to hopefully instruct students in an OS course in future. I am not sure if I am able to link to the ligbgcc or not.

arm-none-eabi-ld -lgcc -Ttext 0x80008000 -entry start_armboot --start-group main.o kprintf.o --end-group -L /usr/local/gcc-arm/lib/gcc/arm-none-eabi/4.5.2/ -o u-boot

is the linker command I am using and it still did not work. Is there anyway to work around the bug in gcc?

Thank you,
- Bharath.

0 Lord Loh. over 14 years ago

Prodigy 160 points

Finally got over the problem by copying the libgcc.a file in the directory with the coudce code and compiling it.

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