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.. _asm_thumb2_index:
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Inline assembler for Thumb2 architectures
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=========================================
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This document assumes some familiarity with assembly language programming and should be read after studying
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the :ref:`tutorial <pyboard_tutorial_assembler>`. For a detailed description of the instruction set consult the
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Architecture Reference Manual detailed below.
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The inline assembler supports a subset of the ARM Thumb-2 instruction set described here. The syntax tries
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to be as close as possible to that defined in the above ARM manual, converted to Python function calls.
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Instructions operate on 32 bit signed integer data except where stated otherwise. Most supported instructions
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operate on registers ``R0-R7`` only: where ``R8-R15`` are supported this is stated. Registers ``R8-R12`` must be
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restored to their initial value before return from a function. Registers ``R13-R15`` constitute the Link Register,
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Stack Pointer and Program Counter respectively.
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Document conventions
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--------------------
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Where possible the behaviour of each instruction is described in Python, for example
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* add(Rd, Rn, Rm) ``Rd = Rn + Rm``
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This enables the effect of instructions to be demonstrated in Python. In certain case this is impossible
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because Python doesn't support concepts such as indirection. The pseudocode employed in such cases is
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described on the relevant page.
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Instruction categories
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----------------------
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The following sections details the subset of the ARM Thumb-2 instruction set supported by MicroPython.
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.. toctree::
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:maxdepth: 1
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:numbered:
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asm_thumb2_mov.rst
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asm_thumb2_ldr.rst
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asm_thumb2_str.rst
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asm_thumb2_logical_bit.rst
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asm_thumb2_arith.rst
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asm_thumb2_compare.rst
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asm_thumb2_label_branch.rst
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asm_thumb2_stack.rst
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asm_thumb2_misc.rst
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asm_thumb2_float.rst
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asm_thumb2_directives.rst
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Usage examples
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--------------
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These sections provide further code examples and hints on the use of the assembler.
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.. toctree::
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:maxdepth: 1
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:numbered:
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asm_thumb2_hints_tips.rst
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References
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----------
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- :ref:`Assembler Tutorial <pyboard_tutorial_assembler>`
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- `Wiki hints and tips
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<http://wiki.micropython.org/platforms/boards/pyboard/assembler>`__
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- `uPy Inline Assembler source-code,
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emitinlinethumb.c <https://github.com/micropython/micropython/blob/master/py/emitinlinethumb.c>`__
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- `ARM Thumb2 Instruction Set Quick Reference
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Card <http://infocenter.arm.com/help/topic/com.arm.doc.qrc0001l/QRC0001_UAL.pdf>`__
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- `RM0090 Reference
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Manual <http://www.google.ae/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&sqi=2&ved=0CBoQFjAA&url=http%3A%2F%2Fwww.st.com%2Fst-web-ui%2Fstatic%2Factive%2Fen%2Fresource%2Ftechnical%2Fdocument%2Freference_manual%2FDM00031020.pdf&ei=G0rSU66xFeuW0QWYwoD4CQ&usg=AFQjCNFuW6TgzE4QpahO_U7g3f3wdwecAg&sig2=iET-R0y9on_Pbflzf9aYDw&bvm=bv.71778758,bs.1,d.bGQ>`__
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- ARM v7-M Architecture Reference Manual (Available on the
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ARM site after a simple registration procedure. Also available on academic sites but beware of out of date versions.)
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