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Translating Assembly Language to Machine Language

Translating Assembly Language to Machine Language. An example program. Notes: Parts of lines appearing after "*" are comments Labels in left hand column are names associated with the corresponding value. Instructions and addresses. Notes:

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Translating Assembly Language to Machine Language

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  1. Translating Assembly Language to Machine Language

  2. An example program Notes: Parts of lines appearing after "*" are comments Labels in left hand column are names associated with the corresponding value

  3. Instructions and addresses Notes: Each instruction will occupy one location in Woody's main memory Comments are ignored in the translation process, so they have been removed here

  4. Pass 1: Create a symbol table

  5. Pass 1: Create a symbol table

  6. Pass 1: Create a symbol table

  7. Pass 1: Create a symbol table

  8. Pass 2: "Assemble" the machine code 1 Machine Code

  9. Pass 2: "Assemble" the machine code 2 Machine Code

  10. Pass 2: "Assemble" the machine code 3 Machine Code

  11. Pass 2: "Assemble" the machine code 4 Machine Code

  12. Pass 2: "Assemble" the machine code 5 Machine Code

  13. Pass 2: "Assemble" the machine code 6 Machine Code

  14. Pass 2: "Assemble" the machine code 7 Machine Code

  15. Pass 2: "Assemble" the machine code 8 Machine Code

  16. Pass 2: "Assemble" the machine code 9 Machine Code

  17. Pass 2: "Assemble" the machine code 10 Machine Code

  18. Pass 2: "Assemble" the machine code 11 Machine Code

  19. Pass 2: "Assemble" the machine code 12 Machine Code

  20. Pass 2: "Assemble" the machine code 13 Machine Code

  21. Pass 2: "Assemble" the machine code 14 Machine Code

  22. Pass 2: "Assemble" the machine code 15 Machine Code

  23. Pass 2: "Assemble" the machine code 16 Machine Code

  24. Pass 2: "Assemble" the machine code 17 Machine Code

  25. Pass 2: "Assemble" the machine code 18 Machine Code

  26. Pass 2: "Assemble" the machine code 19 Machine Code

  27. Pass 2: "Assemble" the machine code 20 Machine Code

  28. Pass 2: "Assemble" the machine code 21 Machine Code

  29. Pass 2: "Assemble" the machine code 22 Machine Code

  30. Pass 2: "Assemble" the machine code 23 Machine Code

  31. Pass 2: "Assemble" the machine code 24 Machine Code

  32. Pass 2: "Assemble" the machine code 25 Machine Code

  33. Pass 2: "Assemble" the machine code 26 Machine Code

  34. Pass 2: "Assemble" the machine code 27 Machine Code

  35. Pass 2: "Assemble" the machine code 28 Machine Code

  36. Pass 2: "Assemble" the machine code 29 Machine Code Literal integer values are translated into binary using the signed magnitude representation

  37. Pass 2: "Assemble" the machine code 30 Machine Code 510 = 000001012 in 8 bit signed magnitude representation

  38. Pass 2: "Assemble" the machine code 31 Machine Code 510 = 000001012 in 8 bit signed magnitude representation

  39. Pass 2: "Assemble" the machine code 32 Machine Code

  40. Pass 2: "Assemble" the machine code 33 Machine Code

  41. Pass 2: "Assemble" the machine code Machine Code This sequence of values, stored in a file, forms the executable for this program.

  42. Observations • This is a very mechanical process. The program that does this job is called an assembler. • Each different computer architecture (Intel Pentium, PowerPC, IBM Cell, etc.) has its own assembly language. • The instructions in assembly language correspond one-to-one with instructions in the target architecture's machine language. • An executable for a program consists of a file containing the machine language instructions for the program.

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