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force gcc usign ARM instruction set,why there are 2byte aligned instructions？

Heron Zhang
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  • Note: This was originally posted on 7th September 2012 at http://forums.arm.com

    Thanks for your reply.

    The source code was recompiled, with the -O2 -marm.I had tried the -mno-thumb,and recompiled again,but the ouput was the same.

    The function above calls the code in section .init to do some init work. How can I compile the source code totally into ARM instruction set,without any other instruction set?
    I have another question,if I had a ARM core which support ONLY ARM instruction set(there is no Thumb,thumb-2 and so on),but with MMU(which means can run LinuxOS),Can I compile the Linux kernel to run on that ARM core?

    thanks again.


    Hmm - that's Thumb code.

    (1) Are you sure it recompiled?

    (2) Try -mno-thumb

    Pete
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  • Note: This was originally posted on 7th September 2012 at http://forums.arm.com

    Thanks for your reply.

    The source code was recompiled, with the -O2 -marm.I had tried the -mno-thumb,and recompiled again,but the ouput was the same.

    The function above calls the code in section .init to do some init work. How can I compile the source code totally into ARM instruction set,without any other instruction set?
    I have another question,if I had a ARM core which support ONLY ARM instruction set(there is no Thumb,thumb-2 and so on),but with MMU(which means can run LinuxOS),Can I compile the Linux kernel to run on that ARM core?

    thanks again.


    Hmm - that's Thumb code.

    (1) Are you sure it recompiled?

    (2) Try -mno-thumb

    Pete
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