as variable '$' have problem

[研发部淡明杰]

bug description: In my program, _expression_ '$-label' is ok to pass(see attachment file line 7&8) assemble, but 'lable-$' cannot pass and as give some error message bellow:
address@hidden:~/workspace$ as -o ef_base.o ef_base.s
ef_base.s: Assembler messages:
ef_base.s:45: Error: can't resolve `.text' {.text section} - `$' {*UND* section}
ef_base.s:47: Error: can't resolve `.text' {.text section} - `$' {*UND* section}

as version:
    GNU assembler (GNU Binutils for Ubuntu) 2.22

system info(uname -ra): 
    Linux cris-pad1 3.2.0-48-generic #74-Ubuntu SMP Thu Jun 6 19:43:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
OS(cat /etc/issue): Ubuntu 12.04.2 LTS \n \l

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Thanks & Best Regards
Cris
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SHENZHEN TENA ELECTRONIC CO., LTD.
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ef_base.s
Description: Binary data