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adding new instruction


hi,
  i like to add a new instruction based on thumb ISA. i have added the instruction in both as and gcc. both of them are working correctly. but when i call ld it shows an error like

/home/.../arm-elf-ld : /home/../arm-elf/lib/libc.a(printf.o)(printf): warning : interworking not enabled
first occurance : /tmp/cc00zhyh.o : thumb call to arm
/tmp//cc00zhyh.o(.text+0x4e>: In function 'main'
new.c:internal error: dangerous error

whether i have to change anything in the ld. i have searched for the ld source file but i counldnt get one in the ld folder. which file has to modified first and what kind of changes are needed.

thanks in advace
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