2007/09/24

The TOY86 Assembler, Revision 1

完成!Architecture 上也做了一點必要的小小更動:讓 PC 從 0x100 起跳。原案「從 0x010 起跳」留前面 16 個 bytes 實在沒什麼意義 XD。下面轉錄初版的 readme file(最新版請點連結):

This is the TOY86 Machine, Revision 1, implemented by Josh Ko.

TOY86/          The original TOY86 project.
toy86_rev1.jar  The Java GUI simulator (source included).
toy86asm.cpp    C++ source code of the assembler.
toy86asm.pdf    Literate program of the assembler.
toy86asm.w      CWEB source of the assembler.

Differences between the original version and Revision 1:
  - The program counter starts from 0x100. This is a more reasonable
    design for TOY86.
  - The syntax rule for comments is relaxed. Any character that is not
    a letter, a digit, an underscore, a plus sign, a minus sign, a star
    sign, or a whitespace begins a comment.
  - Data declarations have slightly different syntax and rules. Please
    refer to section 6 of the literate assembler program.
  - Loading procedure addresses does not need a separate instruction
    "leap". Simply use "lea".
  - The "RZ * c" term in data transfer instructions cannot be written
    as "c * RZ".
  - All procedure instructions may appear outside procedures.
  - Procedures must come after all exposed instructions. (Hence the
    assembly source is divided into three parts: data declarations,
    exposed instructions, and procedures, in the order they appear.)

Note: please don't read the .cpp file; read the .pdf instead. They are
both extracted by CWEB tools from the .w file. The .cpp file is intended
for compilation while the .pdf file is for human reading.

--
等我多看幾遍再寄信給 cyy XD。

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