You will implement, using C, pass 1 of an assembler for the machine architecture described in the SIC System Programmer’s guide provided as reference for this course. Remember that to generate SIC object code, we will need to make two passes through the assembly file. Pass one generates the symbol table and pass two uses the symbol table and op codes to generate the object file. You will be doing pass two via project 2. Think about this in your design.
There are some validation checks which should be done during pass one. You should carefully consider the errors in the SIC assembly file input that can and should be discovered during pass one and when encountered in the source file, generate an appropriate error message and stop the assembly process. There are AT LEAST FOUR errors which pass one should be able to detect and report (all of which should HALT the assembly process and generate an error message).
For example: if an error is found with the input assembly file, you should stop the process of creating the symbol table and output the following:
<The contents of the source line of assembly which contains the error><CrLf>
Line <line #> <Description of Error Encountered><CrLf>
If the SIC assembly file is valid, then project 1 should output, its symbol table. For each symbol, there should be one line of output: the symbol name followed by a <tab> character, followed by the hexadecimal address of the symbol, followed by a <CrLf>.
—– Example —-
COPY START 1000 FIRST STL RETADR CLOOP JSUB RDREC LDA LENGTH COMP ZERO JEQ ENDFIL JSUB WRREC J CLOOP ENDFIL LDA EOF STA BUFFER LDA THREE STA LENGTH JSUB WRREC LDL RETADR RSUB EOF BYTE C'EOF' THREE WORD 3 ZERO WORD 0 RETADR RESW 1 LENGTH RESW 1 BUFFER RESB 4096 RDREC LDX ZERO LDA ZERO RLOOP TD INPUT JEQ RLOOP RD INPUT COMP ZERO JEQ EXIT STCH BUFFER,X TIX MAXLEN JLT RLOOP EXIT STX LENGTH RSUB INPUT BYTE X'F1' MAXLEN WORD 4096 WRREC LDX ZERO WLOOP TD OUTPUT JEQ WLOOP LDCH BUFFER,X WD OUTPUT TIX LENGTH JLT WLOOP RSUB OUTPUT BYTE X'05' END FIRST
The correct output for this input file would be:
I will build you project by typing make. I will then run your project by typing project1 <filename>
where <filename> is the name of a SIC assembler file.
the turnin code for this project is: System_Software_Project1
You need to shar your .c and makefile and turnin the sharfile to me.
Additionally, I expect you to include a documentation.txt file in your sharfile. documentation.txt should contian approximately two paragraphs. Please let me know what, if anything, is incomplete (any specifications you did not complete), a description of your symbol table implementation.
Caveats: We are writing system software (an assembler). You must use an appropriate ADT to store your symbol table. An array is not acceptable.
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