Created a hex assembler that supports single character labels with both forward and backward references
This commit is contained in:
Jeremiah Orians
parent
a257945bd6
commit
8e34f343cb
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@ -0,0 +1,231 @@
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# start
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2D2801e8 # LOADUI R8 @table ; Where we are putting our address pointers
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2D2900ff # LOADUI R9 0xFF ; Byte mask
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2D2A000f # LOADUI R10 0x0F ; nybble mask
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2D2B0001 # LOADUI R11 1 ; Our toggle
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0D00002C # FALSE R12 ; Our PC counter
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2D2D0600 # LOADUI R13 0x600 ; Where we are starting our Stack
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# ;; We will be using R14 for our condition codes
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# ;; We will be using R15 for holding our processed nybbles
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# ;; Prep TAPE_01
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2D201100 # LOADUI R0 0x1100
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42100000 # FOPEN_READ
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# ;; Prep TAPE_02
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2D201101 # LOADUI R0 0x1101
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42100001 # FOPEN_WRITE
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# ;; Function for collecting the address of all labels
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# getLables
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2D211100 # LOADUI R1 0x1100 ; Read from tape_01
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42100100 # FGETC ; Read a Char
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# ;; Check for EOF
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A0100000 # CMPSKIP.GE R0 0
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3C00005c # JUMP @stage2
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# ;; Check for Label
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A030003a # CMPSKIP.NE R0 58 ; If the Char is : the next char is the label
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2D0D0040 # CALLI R13 @storeLabel
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# ;; Check for pointer to label
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1FE00040 # CMPUI R14 R0 64 ; If the Char is @ the next char is the pointer to a label
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2C6E0014 # JUMP.NE R14 @.L0
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# ;; Ignore the pointer for now
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2D211100 # LOADUI R1 0x1100 ; Read from tape_01
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42100100 # FGETC ; Read a Char
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0FCC0002 # ADDUI R12 R12 2 ; The pointer will end up taking 2 bytes
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3C00ffd4 # JUMP @getLables
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# .L0
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# ;; Otherwise attempt to process
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2D0D00fc # CALLI R13 @hex ; Convert it
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A0100000 # CMPSKIP.GE R0 0 ; Don't record, nonhex values
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3C00ffc8 # JUMP @getLables ; Move onto Next char
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# ;; Determine if we got a full byte
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2C9B000c # JUMP.Z R11 @.L1 ; Jump if toggled
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# ;; Deal with case of first half of byte
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0D00002B # FALSE R11 ; Flip the toggle
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3C00ffbc # JUMP @getLables
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# .L1
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# ;; Deal with case of second half of byte
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0D00003B # TRUE R11 ; Flip the toggle
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0FCC0001 # ADDUI R12 R12 1 ; increment PC now that we have a full byte
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3C00ffb0 # JUMP @getLables
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# ;; Function for storing the address of the label
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# storeLabel
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# ;; Get the char of the Label
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2D211100 # LOADUI R1 0x1100 ; Read from tape_01
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42100100 # FGETC ; Read a Char
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# ;; We require 4 bytes to store the pointer values
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2D500002 # SL0I R0 2 ; Thus we multiply our label by 4
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# ;; Store the current Program counter
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05048C80 # STOREX R12 R8 R0
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# ;; Label is safely stored, return
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0D01001D # RET R13
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# ;; Main Functionality
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# stage2
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# ;; We first need to rewind tape_01 to perform our second pass
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2D201100 # LOADUI R0 0x1100
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42100003 # REWIND
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# ;; Reset our toggle and counter, just in case
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2D2B0001 # LOADUI R11 1 ; Our toggle
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0D00002C # FALSE R12 ; Our PC counter
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# loop
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2D211100 # LOADUI R1 0x1100 ; Read from tape_01
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42100100 # FGETC ; Read a Char
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# ;; Check for EOF
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A0100000 # CMPSKIP.GE R0 0
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3C000128 # JUMP @finish
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# ;; Check for Label
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1FE0003a # CMPUI R14 R0 58 ; Make sure we jump over the label
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2C6E0010 # JUMP.NE R14 @.L97
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# ;; Consume next char
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2D211100 # LOADUI R1 0x1100 ; Read from tape_01
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42100100 # FGETC ; Read a Char
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3C00ffe0 # JUMP @loop
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# .L97
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# ;; Check for Pointer
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1FE00040 # CMPUI R14 R0 64 ; If it is a pointer Deal with it
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2C6E000c # JUMP.NE R14 @.L98 ; Otherwise attempt to process it
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2D0D004c # CALLI R13 @storePointer
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3C00ffd0 # JUMP @loop
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# .L98
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# ;; Process Char
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2D210000 # LOADUI R1 0 ; Write to Char to TTY
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42100200 # FPUTC ; Print the Char
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2D0D0078 # CALLI R13 @hex ; Convert it
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12E00000 # CMPI R14 R0 0 ; Check if it is hex
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2C8Effbc # JUMP.L R14 @loop ; Don't use nonhex chars
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2C9B0010 # JUMP.Z R11 @.L99 ; Jump if toggled
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# ;; Process first byte of pair
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05020F0A # AND R15 R0 R10 ; Store First nibble
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0D00002B # FALSE R11 ; Flip the toggle
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3C00ffac # JUMP @loop
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# .L99
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2D5F0004 # SL0I R15 4 ; Shift our first nibble
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0502000A # AND R0 R0 R10 ; Mask out top
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0500000F # ADD R0 R0 R15 ; Combine nibbles
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0D00003B # TRUE R11 ; Flip the toggle
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2D211101 # LOADUI R1 0x1101 ; Write the combined byte
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42100200 # FPUTC ; To TAPE_02
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0FCC0001 # ADDUI R12 R12 1 ; increment PC now that we have a full byte
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3C00ff8c # JUMP @loop ; Try to get more bytes
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# storePointer
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# ;; Correct the PC to reflect the size of the pointer
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0FCC0002 # ADDUI R12 R12 2 ; Exactly 2 bytes
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# ;; Get the char of the Label
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2D211100 # LOADUI R1 0x1100 ; Read from tape_01
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42100100 # FGETC ; Read a Char
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# ;; Since we stored a full pointer taking up 4 bytes
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2D500002 # SL0I R0 2 ; Thus we multiply our label by 4 to get where it is stored
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05038280 # LOADX R2 R8 R0 ; Load the address of the label
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# ;; We now have to calculate the distance and store the 2 bytes
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0500222C # SUB R2 R2 R12 ; First determine the difference between the current PC and the stored PC of the label
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0F220004 # ADDUI R2 R2 4 ; Adjust for relative positioning
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# ;; Store Upper byte
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09000402 # COPY R0 R2
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2D400008 # SARI R0 8 ; Drop the bottom 8 bits
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05020009 # AND R0 R0 R9 ; Mask out everything but bottom bits
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2D211101 # LOADUI R1 0x1101 ; Write the byte
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42100200 # FPUTC ; To TAPE_02
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# ;; Store Lower byte
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05020029 # AND R0 R2 R9 ; Drop everything but the bottom 8 bits
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42100200 # FPUTC ; Write the byte to TAPE_02
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0D01001D # RET R13
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# hex
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# ;; Deal with line comments starting with #
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1FE00023 # CMPUI R14 R0 35
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2C5E0060 # JUMP.E R14 @ascii_comment
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# ;; Deal with line comments starting with ;
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1FE0003b # CMPUI R14 R0 59
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2C5E0058 # JUMP.E R14 @ascii_comment
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# ;; Deal with all ascii less than '0'
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1FE00030 # CMPUI R14 R0 48
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2C8E0048 # JUMP.L R14 @ascii_other
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# ;; Deal with '0'-'9'
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1FE00039 # CMPUI R14 R0 57
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2C7E0028 # JUMP.LE R14 @ascii_num
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# ;; Deal with all ascii less than 'A'
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1FE00041 # CMPUI R14 R0 65
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2C8E0038 # JUMP.L R14 @ascii_other
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# ;; Deal with 'A'-'F'
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1FE00046 # CMPUI R14 R0 70
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2C7E0028 # JUMP.LE R14 @ascii_high
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# ;; Deal with all ascii less than 'a'
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1FE00061 # CMPUI R14 R0 97
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2C8E0028 # JUMP.L R14 @ascii_other
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# ;; Deal with 'a'-'f'
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1FE00066 # CMPUI R14 R0 102
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2C7E0010 # JUMP.LE R14 @ascii_low
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# ;; Ignore the rest
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3C00001c # JUMP @ascii_other
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# ascii_num
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11000030 # SUBUI R0 R0 48
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0D01001D # RET R13
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# ascii_low
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11000057 # SUBUI R0 R0 87
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0D01001D # RET R13
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# ascii_high
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11000037 # SUBUI R0 R0 55
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0D01001D # RET R13
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# ascii_other
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0D000030 # TRUE R0
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0D01001D # RET R13
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# ascii_comment
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2D211100 # LOADUI R1 0x1100 ; Read from TAPE_01
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42100100 # FGETC ; Read another char
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1FE0000a # CMPUI R14 R0 10 ; Stop at the end of line
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2D210000 # LOADUI R1 0 ; Write to TTY
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42100200 # FPUTC ; The char we just read
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2C6Effec # JUMP.NE R14 @ascii_comment ; Otherwise keep looping
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3C00ffe0 # JUMP @ascii_other
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# finish
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2D201100 # LOADUI R0 0x1100 ; Close TAPE_01
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42100002 # FCLOSE
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2D201101 # LOADUI R0 0x1101 ; Close TAPE_02
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42100002 # FCLOSE
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FFFFFFFF # HALT
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# ;; Where all of our pointers will be stored for our locations
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# table
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@ -0,0 +1,220 @@
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start
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LOADUI R8 @table ; Where we are putting our address pointers
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LOADUI R9 0xFF ; Byte mask
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LOADUI R10 0x0F ; nybble mask
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LOADUI R11 1 ; Our toggle
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FALSE R12 ; Our PC counter
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LOADUI R13 0x600 ; Where we are starting our Stack
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;; We will be using R14 for our condition codes
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;; We will be using R15 for holding our processed nybbles
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;; Prep TAPE_01
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LOADUI R0 0x1100
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FOPEN_READ
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;; Prep TAPE_02
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LOADUI R0 0x1101
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FOPEN_WRITE
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;; Function for collecting the address of all labels
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getLables
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LOADUI R1 0x1100 ; Read from tape_01
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FGETC ; Read a Char
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;; Check for EOF
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CMPSKIP.GE R0 0
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JUMP @stage2
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;; Check for Label
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CMPSKIP.NE R0 58 ; If the Char is : the next char is the label
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CALLI R13 @storeLabel
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;; Check for pointer to label
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CMPUI R14 R0 64 ; If the Char is @ the next char is the pointer to a label
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JUMP.NE R14 @.L0
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;; Ignore the pointer for now
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LOADUI R1 0x1100 ; Read from tape_01
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FGETC ; Read a Char
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ADDUI R12 R12 2 ; The pointer will end up taking 2 bytes
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JUMP @getLables
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.L0
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;; Otherwise attempt to process
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CALLI R13 @hex ; Convert it
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CMPSKIP.GE R0 0 ; Don't record, nonhex values
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JUMP @getLables ; Move onto Next char
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;; Determine if we got a full byte
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JUMP.Z R11 @.L1 ; Jump if toggled
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;; Deal with case of first half of byte
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FALSE R11 ; Flip the toggle
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JUMP @getLables
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.L1
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;; Deal with case of second half of byte
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TRUE R11 ; Flip the toggle
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ADDUI R12 R12 1 ; increment PC now that we have a full byte
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JUMP @getLables
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;; Function for storing the address of the label
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storeLabel
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;; Get the char of the Label
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LOADUI R1 0x1100 ; Read from tape_01
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FGETC ; Read a Char
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;; We require 4 bytes to store the pointer values
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SL0I R0 2 ; Thus we multiply our label by 4
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;; Store the current Program counter
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STOREX R12 R8 R0
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;; Label is safely stored, return
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RET R13
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;; Main Functionality
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stage2
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;; We first need to rewind tape_01 to perform our second pass
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LOADUI R0 0x1100
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REWIND
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;; Reset our toggle and counter, just in case
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LOADUI R11 1 ; Our toggle
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FALSE R12 ; Our PC counter
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loop
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LOADUI R1 0x1100 ; Read from tape_01
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FGETC ; Read a Char
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;; Check for EOF
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CMPSKIP.GE R0 0
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JUMP @finish
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;; Check for Label
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CMPUI R14 R0 58 ; Make sure we jump over the label
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JUMP.NE R14 @.L97
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;; Consume next char
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LOADUI R1 0x1100 ; Read from tape_01
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FGETC ; Read a Char
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JUMP @loop
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.L97
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;; Check for Pointer
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CMPUI R14 R0 64 ; If it is a pointer Deal with it
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JUMP.NE R14 @.L98 ; Otherwise attempt to process it
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CALLI R13 @storePointer
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JUMP @loop
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.L98
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;; Process Char
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LOADUI R1 0 ; Write to Char to TTY
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FPUTC ; Print the Char
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CALLI R13 @hex ; Convert it
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CMPI R14 R0 0 ; Check if it is hex
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JUMP.L R14 @loop ; Don't use nonhex chars
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JUMP.Z R11 @.L99 ; Jump if toggled
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;; Process first byte of pair
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AND R15 R0 R10 ; Store First nibble
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FALSE R11 ; Flip the toggle
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JUMP @loop
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.L99
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SL0I R15 4 ; Shift our first nibble
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AND R0 R0 R10 ; Mask out top
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ADD R0 R0 R15 ; Combine nibbles
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TRUE R11 ; Flip the toggle
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LOADUI R1 0x1101 ; Write the combined byte
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FPUTC ; To TAPE_02
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ADDUI R12 R12 1 ; increment PC now that we have a full byte
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JUMP @loop ; Try to get more bytes
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storePointer
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;; Correct the PC to reflect the size of the pointer
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ADDUI R12 R12 2 ; Exactly 2 bytes
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;; Get the char of the Label
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LOADUI R1 0x1100 ; Read from tape_01
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FGETC ; Read a Char
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;; Since we stored a full pointer taking up 4 bytes
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SL0I R0 2 ; Thus we multiply our label by 4 to get where it is stored
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LOADX R2 R8 R0 ; Load the address of the label
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;; We now have to calculate the distance and store the 2 bytes
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SUB R2 R2 R12 ; First determine the difference between the current PC and the stored PC of the label
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ADDUI R2 R2 4 ; Adjust for relative positioning
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;; Store Upper byte
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COPY R0 R2
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SARI R0 8 ; Drop the bottom 8 bits
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AND R0 R0 R9 ; Mask out everything but bottom bits
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LOADUI R1 0x1101 ; Write the byte
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FPUTC ; To TAPE_02
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;; Store Lower byte
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AND R0 R2 R9 ; Drop everything but the bottom 8 bits
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FPUTC ; Write the byte to TAPE_02
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RET R13
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hex
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;; Deal with line comments starting with #
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CMPUI R14 R0 35
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JUMP.E R14 @ascii_comment
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;; Deal with line comments starting with ;
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CMPUI R14 R0 59
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JUMP.E R14 @ascii_comment
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;; Deal with all ascii less than '0'
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CMPUI R14 R0 48
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JUMP.L R14 @ascii_other
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;; Deal with '0'-'9'
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CMPUI R14 R0 57
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JUMP.LE R14 @ascii_num
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;; Deal with all ascii less than 'A'
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CMPUI R14 R0 65
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JUMP.L R14 @ascii_other
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;; Deal with 'A'-'F'
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CMPUI R14 R0 70
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JUMP.LE R14 @ascii_high
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;; Deal with all ascii less than 'a'
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CMPUI R14 R0 97
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JUMP.L R14 @ascii_other
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;; Deal with 'a'-'f'
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CMPUI R14 R0 102
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JUMP.LE R14 @ascii_low
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;; Ignore the rest
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JUMP @ascii_other
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ascii_num
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SUBUI R0 R0 48
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RET R13
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ascii_low
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SUBUI R0 R0 87
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RET R13
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ascii_high
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SUBUI R0 R0 55
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RET R13
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ascii_other
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TRUE R0
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RET R13
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ascii_comment
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LOADUI R1 0x1100 ; Read from TAPE_01
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FGETC ; Read another char
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CMPUI R14 R0 10 ; Stop at the end of line
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LOADUI R1 0 ; Write to TTY
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FPUTC ; The char we just read
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JUMP.NE R14 @ascii_comment ; Otherwise keep looping
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JUMP @ascii_other
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finish
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LOADUI R0 0x1100 ; Close TAPE_01
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FCLOSE
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LOADUI R0 0x1101 ; Close TAPE_02
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FCLOSE
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HALT
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;; Where all of our pointers will be stored for our locations
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table
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