548 lines
16 KiB
Plaintext
548 lines
16 KiB
Plaintext
## This file is part of stage0.
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##
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## stage0 is free software: you an redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## stage0 is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with stage0. If not, see <http://www.gnu.org/licenses/>.
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# :start
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:0
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2D2D @1 # LOADUI R13 @table ; Where we are putting our table
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# ;; We will be using R14 for our condition codes
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2D2F7fff # LOADUI R15 0x7FFF ; We will be using R15 for our stack
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# ;; Main program functionality
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# ;; Reads in Tape_01 and writes out results onto Tape_02
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# ;; Accepts no arguments and HALTS when done
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# :main
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:3
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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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# ;; Intialize environment
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0D00002C # FALSE R12 ; Set holder to zero
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0D00002B # FALSE R11 ; Set PC counter to zero
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2D2A0001 # LOADUI R10 1 ; Our toggle
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# ;; Perform first pass
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2D0F @2 # CALLI R15 @first_pass
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# ;; We 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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# ;; Reintialize environment
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0D00002C # FALSE R12 ; Set holder to zero
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0D00002B # FALSE R11 ; Set PC counter to zero
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2D2A0001 # LOADUI R10 1 ; Our toggle
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2D2900ff # LOADUI R9 0xFF ; Byte mask
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2D28000f # LOADUI R8 0x0F ; nybble mask
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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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2D0F @4 # CALLI R15 @second_pass
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# ;; Close up as we are done
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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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# ;; First pass function
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# ;; Reads Tape_01 and creates our label table
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# ;; Will Overwrite R0 R10 R11
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# ;; Returns to Main function when done
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# :first_pass
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:2
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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 # CMPSKIPI.GE R0 0
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0D01001F # RET R15
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# ;; Check for and deal with label (:)
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A030003a # CMPSKIPI.NE R0 58
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3C00 @5 # JUMP @storeLabel
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# ;; Check for and deal with pointers to labels
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# ;; Starting with (@)
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A0300040 # CMPSKIPI.NE R0 64
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3C00 @6 # JUMP @ThrowAwayPointer
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# ;; Then dealing with ($)
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A0300024 # CMPSKIPI.NE R0 36
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3C00 @6 # JUMP @ThrowAwayPointer
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# ;; Now check for absolute addresses (&)
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A0300026 # CMPSKIPI.NE R0 38
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3C00 @v # JUMP @ThrowAwayAddress
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# ;; Otherwise attempt to process
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2D0F @7 # CALLI R15 @hex ; Convert it
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A0100000 # CMPSKIPI.GE R0 0 ; Don't record, nonhex values
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3C00 @2 # JUMP @first_pass ; Move onto Next char
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# ;; Determine if we got a full byte
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2C9A @8 # JUMP.Z R10 @first_pass_0 ; Jump if toggled
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# ;; Deal with case of first half of byte
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0D00002A # FALSE R10 ; Flip the toggle
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3C00 @2 # JUMP @first_pass
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# :first_pass_0
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:8
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# ;; Deal with case of second half of byte
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0D00003A # TRUE R10 ; Flip the toggle
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0FBB0001 # ADDUI R11 R11 1 ; increment PC now that that we have a full byte
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3C00 @2 # JUMP @first_pass
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# ;; Second pass function
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# ;; Reads from Tape_01 and uses the values in the table
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# ;; To write desired contents onto Tape_02
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# ;; Will Overwrite R0 R10 R11
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# ;; Returns to Main function when done
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#:second_pass
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:4
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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 # CMPSKIPI.GE R0 0
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0D01001F # RET R15
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# ;; Check for and deal with label
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A030003a # CMPSKIPI.NE R0 58
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3C00 @9 # JUMP @ThrowAwayLabel
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# ;; Check for and deal with Pointers to labels
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A0300040 # CMPSKIPI.NE R0 64 ; @ for relative
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3C00 @a # JUMP @StoreRelativePointer
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A0300024 # CMPSKIPI.NE R0 36 ; $ for absolute
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3C00 @b # JUMP @StoreAbsolutePointer
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A0300026 # CMPSKIPI.NE R0 38 ; & for address
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3C00 @w # JUMP @StoreAbsoluteAddress
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# ;; Process everything else
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2D0F @7 # CALLI R15 @hex ; Attempt to Convert it
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A0100000 # CMPSKIPI.GE R0 0 ; Don't record, nonhex values
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3C00 @4 # JUMP @second_pass ; Move onto Next char
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# ;; Determine if we got a full byte
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2C9A @c # JUMP.Z R10 @second_pass_0 ; Jump if toggled
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# ;; Deal with case of first half of byte
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05020C08 # AND R12 R0 R8 ; Store our first nibble
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0D00002A # FALSE R10 ; Flip the toggle
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3C00 @4 # JUMP @second_pass
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# :second_pass_0
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:c
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# ;; Deal with case of second half of byte
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2D5C0004 # SL0I R12 4 ; Shift our first nybble
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05020008 # AND R0 R0 R8 ; Mask out top
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0500000C # ADD R0 R0 R12 ; Combine nybbles
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0D00003A # TRUE R10 ; 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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0FBB0001 # ADDUI R11 R11 1 ; increment PC now that that we have a full byte
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3C00 @4 # JUMP @second_pass
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# ;; Store Label function
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# ;; Writes out the token and the current PC value
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# ;; Its static variable for storing the next index to be used
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# ;; Will overwrite R0
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# ;; Returns to first pass when done
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#:storeLabel
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:5
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2E00 @d # LOADR R0 @current_index ; Get address of first open index
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A0300000 # CMPSKIPI.NE R0 0 ; If zero intialize from R13
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0900040D # COPY R0 R13
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# ;; Store the PC of the label
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23B00000 # STORE32 R11 R0 0
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# ;; Store the name of the Label
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0F000004 # ADDUI R0 R0 4 ; Increment the offset of the index
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2D0F @e # CALLI R15 @writeout_token
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# ;; Update our index
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0F00003c # ADDUI R0 R0 60 ; Hopefully our tokens are less than 60 bytes long
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2F00 @d # STORER R0 @current_index
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# ;; And be done
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3C00 @2 # JUMP @first_pass
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# ;; Where we are storing the location of the next free table entry
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# :current_index
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:d
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00000000 # NOP
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# ;; StoreRelativepointer function
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# ;; Deals with the special case of relative pointers
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# ;; Clears Temp
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# ;; Stores string in Temp
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# ;; Finds match in Table
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# ;; Writes out the offset
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# ;; Modifies R0 R11
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# ;; Jumps back into Pass2
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# :StoreRelativePointer
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:a
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# ;; Correct the PC to reflect the size of the pointer
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0FBB0002 # ADDUI R11 R11 2 ; Exactly 2 bytes
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2D2003cc # LOADUI R0 $Temp ; Set where we want to shove our string
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2D0F @f # CALLI R15 @Clear_string ; Clear it
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2D0F @e # CALLI R15 @writeout_token ; Write it
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2D0F @g # CALLI R15 @Match_string ; Find the Match
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1800fffc # LOAD32 R0 R0 -4 ; Get the value we care about
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0500200B # SUB R0 R0 R11 ; Determine the difference
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0F000004 # ADDUI R0 R0 4 ; Adjust for relative positioning
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2D0F @h # CALLI R15 @ProcessImmediate ; Write out the value
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3C00 @4 # JUMP @second_pass
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# ;; StoreAbsolutepointer function
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# ;; Deals with the special case of absolute pointers
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# ;; Clears Temp
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# ;; Stores string in Temp
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# ;; Finds match in Table
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# ;; Writes out the absolute address of match
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# ;; Modifies R0 R11
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# ;; Jumps back into Pass2
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# :StoreAbsolutePointer
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:b
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# ;; Correct the PC to reflect the size of the pointer
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0FBB0002 # ADDUI R11 R11 2 ; Exactly 2 bytes
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2D2003cc # LOADUI R0 $Temp ; Set where we want to shove our string
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2D0F @f # CALLI R15 @Clear_string ; Clear it
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2D0F @e # CALLI R15 @writeout_token ; Write it
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2D0F @g # CALLI R15 @Match_string ; Find the Match
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1800fffc # LOAD32 R0 R0 -4 ; Get the value we care about
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2D0F @h # CALLI R15 @ProcessImmediate ; Write out the value
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3C00 @4 # JUMP @second_pass
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# ;; StoreAbsoluteAddress function
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# ;; Deal with the special case of absolute Addresses
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# ;; Clear Temp
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# ;; Stores string in Temp
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# ;; Finds match in Table
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# ;; Writes out the full absolute address [32 bit machine]
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# ;; Modifies R0 R11
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# ;; Jumpbacs back into Pass2
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# :StoreAbsoluteAddress
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# ;; COrrect the PC to reflect the size of the address
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:w
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0FBB0004 # ADDUI R11 R11 4 ; 4 Bytes on 32bit machines
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2D2003cc # LOADUI R0 $Temp ; Set where we ant to shove our string
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2D0F @f # CALLI R15 @Clear_string ; Clear it
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2D0F @e # CALLI R15 @writeout_token ; Write it
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2D0F @g # CALLI R15 @Match_string ; Find the Match
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090200EF # PUSHR R14 R15 ; Get a temp storage place
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18E0fffc # LOAD32 R14 R0 -4 ; Get the value we care about
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0900040E # COPY R0 R14 ; We need to print the top 2 bytes first
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2D400010 # SARI R0 16 ; Drop bottom 16 bits
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2D0F @h # CALLI R15 @ProcessImmediate ; Write out top 2 bytes
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2D20ffff # LOADUI R0 0xFFFF ; Provide mask to keep bottom 2 bytes
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0502000E # AND R0 R0 R14 ; Drop top 16 bits
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090280EF # POPR R14 R15 ; Restore R14
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2D0F @h # CALLI R15 @ProcessImmediate ; Write out bottom 2 bytes
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3C00 @4 # JUMP @second_pass
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# ;; Writeout Token Function
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# ;; Writes the Token [minus first char] to the address
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# ;; It recieves in R0 until it reaches a delimiter
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# ;; All register values are preserved
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# ;; Returns to whatever called it
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# :writeout_token
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:e
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# ;; Preserve registers
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0902000F # PUSHR R0 R15
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0902001F # PUSHR R1 R15
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0902002F # PUSHR R2 R15
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# ;; Initialize
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09000520 # MOVE R2 R0 ; Set R2 as our index
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2D211100 # LOADUI R1 0x1100 ; Read from tape_01
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# ;; Our core loop
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# :writeout_token_0
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:j
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42100100 # FGETC ; Get another byte
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# ;; Deal with termination cases
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A0300020 # CMPSKIPI.NE R0 32 ; Finished if space
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3C00 @i # JUMP @writeout_token_done
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A0300009 # CMPSKIPI.NE R0 9 ; Finished if tab
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3C00 @i # JUMP @writeout_token_done
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A030000a # CMPSKIPI.NE R0 10 ; Finished if newline
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3C00 @i # JUMP @writeout_token_done
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# ;; Deal with valid input
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21020000 # STORE8 R0 R2 0 ; Write out the byte
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0F220001 # ADDUI R2 R2 1 ; Increment
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3C00 @j # JUMP @writeout_token_0 ; Keep looping
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# ;; Clean up now that we are done
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# :writeout_token_done
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:i
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# ;; Restore registers
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0902802F # POPR R2 R15
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0902801F # POPR R1 R15
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0902800F # POPR R0 R15
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# ;; And be done
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0D01001F # RET R15
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# ;; Clear string function
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# ;; Clears string pointed at by the value of R0
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# ;; Until a null character is reached
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# ;; Doesn't alter any registers
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# ;; Returns to the function that calls it
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# :Clear_string
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:f
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# ;; Preserve registers
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0902000F # PUSHR R0 R15
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0902001F # PUSHR R1 R15
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0902002F # PUSHR R2 R15
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0902003F # PUSHR R3 R15
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# ;; Setup registers
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09000510 # MOVE R1 R0
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2D220000 # LOADUI R2 0
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2D230000 # LOADUI R3 0
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# :clear_byte
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:k
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0503A012 # LOADXU8 R0 R1 R2 ; Get the byte
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05049312 # STOREX8 R3 R1 R2 ; Overwrite with a Zero
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0F220001 # ADDUI R2 R2 1 ; Prep for next loop
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2CA0 @k # JUMP.NZ R0 @clear_byte ; Stop if byte is NULL
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# ;; Done
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# ;; Restore registers
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0902803F # POPR R3 R15
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0902802F # POPR R2 R15
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0902801F # POPR R1 R15
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0902800F # POPR R0 R15
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0D01001F # RET R15
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# ;; Match string function
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# ;; Walks down table until match is found
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# ;; Then returns address of matching string in R0
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# ;; Returns to whatever called it
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# :Match_string
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:g
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# ;; Preserve registers
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0902001F # PUSHR R1 R15
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0902002F # PUSHR R2 R15
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# ;; Initialize for Loop
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2D2103cc # LOADUI R1 $Temp ; We always compare against Temp
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2D22040c # LOADUI R2 $table ; Begin at start of table
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0F220004 # ADDUI R2 R2 4 ; Where the string is located
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# ;; Loop until we find a match
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# :Match_string_0
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:n
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09000402 # COPY R0 R2 ; Set R0 to our current string
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2D0F @l # CALLI R15 @strcmp
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2C50 @m # JUMP.E R0 @Match_string_1 ; It is a match!
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# ;; Prepare for next loop
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2D2103cc # LOADUI R1 $Temp ; That function clears R1
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0F220040 # ADDUI R2 R2 64 ; Each Index is 64 bytes
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3C00 @n # JUMP @Match_string_0 ; Keep looping
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# :Match_string_1
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:m
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# ;; Store the correct answer
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09000502 # MOVE R0 R2
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# ;; Restore registers
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0902802F # POPR R2 R15
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0902801F # POPR R1 R15
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0D01001F # RET R15
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# ;; Our simple string compare function
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# ;; Recieves two pointers in R0 and R1
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# ;; Returns the difference between the strings in R0
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# ;; Clears R1
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# ;; Returns to whatever called it
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# :strcmp
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:l
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# ;; Preserve registers
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0902002F # PUSHR R2 R15
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0902003F # PUSHR R3 R15
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0902004F # PUSHR R4 R15
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# ;; Setup registers
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09000520 # MOVE R2 R0
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09000531 # MOVE R3 R1
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2D240000 # LOADUI R4 0
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# :cmpbyte
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:o
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0503A024 # LOADXU8 R0 R2 R4 ; Get a byte of our first string
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0503A134 # LOADXU8 R1 R3 R4 ; Get a byte of our second string
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0F440001 # ADDUI R4 R4 1 ; Prep for next loop
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05004101 # CMP R1 R0 R1 ; Compare the bytes
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A0200000 # CMPSKIPI.E R0 0 ; Stop if byte is NULL
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2C51 @o # JUMP.E R1 @cmpbyte ; Loop if bytes are equal
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# ;; Done
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09000501 # MOVE R0 R1 ; Prepare for return
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# ;; Restore registers
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0902804F # POPR R4 R15
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0902803F # POPR R3 R15
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0902802F # POPR R2 R15
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0D01001F # RET R15
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# ;; Processimmediate Function
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# ;; Recieves an integer value in R0
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# ;; Writes out the values to Tape_02
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# ;; Doesn't modify registers
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# ;; Returns to whatever called it
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# :ProcessImmediate
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:h
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# ;; Preserve registers
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0902000F # PUSHR R0 R15
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0902001F # PUSHR R1 R15
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0902002F # PUSHR R2 R15
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# ;; Break up Immediate
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05020209 # AND R2 R0 R9 ; Put lower byte in R2
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2D400008 # SARI R0 8 ; Drop Bottom byte from R0
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05020009 # AND R0 R0 R9 ; Maskout everything outside of top byte
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# ;; Write out Top Byte
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2D211101 # LOADUI R1 0x1101 ; Write the byte
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42100200 # FPUTC ; To TAPE_02
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# ;; Write out bottom Byte
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09000502 # MOVE R0 R2 ; Put Lower byte in R0
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2D211101 # LOADUI R1 0x1101 ; Write the byte
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42100200 # FPUTC ; To TAPE_02
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# ;; Restore registers
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0902802F # POPR R2 R15
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0902801F # POPR R1 R15
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0902800F # POPR R0 R15
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# ;; Be Done
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0D01001F # RET R15
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# ;; ThrowAwaypointer function
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# ;; Handle the special case of a generic problem
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# ;; for Pass1, Will update R11 and modify R0
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# ;; Will return to the start of first_pass
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# ;; Never call this function, only jump to it
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# :ThrowAwayPointer
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:6
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0FBB0002 # ADDUI R11 R11 2 ; Pointers always take up 2 bytes
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2D0F @p # CALLI R15 @throwAwayToken ; Get rid of rest of token
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3C00 @2 # JUMP @first_pass ; Then return to the proper place
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# ;; ThrowAwayAddress function
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# ;; Handle the case of a 32bit absolute address storage
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# ;; for Pass1, Will update R11 and modify R0
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# ;; Will return to the start of first_pass
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# ;; Never call this function, conly jump to it
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# :ThrowAwayAddress
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:v
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0FBB0004 # ADDUI R11 R11 4 ; Addresses on 32bit systems take up 4 bytes
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2D0F @p # CALLI R15 @throwAwayToken ; Get rid of rest of token
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3C00 @2 # JUMP @first_pass ; Then return to the proper place
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# ;; ThrowAwaylabel function
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# ;; Handle the special case of a generic problem
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# ;; for Pass2, Will update R11 and modify R0
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# ;; Will return to the start of second_pass
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# ;; Never call this function, only jump to it
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# :ThrowAwayLabel
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:9
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2D0F @p # CALLI R15 @throwAwayToken ; Get rid of rest of token
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3C00 @4 # JUMP @second_pass
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# ;; Throw away token function
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# ;; Deals with the general case of not wanting
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# ;; The rest of the characters in a token
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# ;; This Will alter the values of R0 R1
|
|
# ;; Returns back to whatever called it
|
|
# :throwAwayToken
|
|
:p
|
|
2D211100 # LOADUI R1 0x1100 ; Read from tape_01
|
|
42100100 # FGETC ; Read a Char
|
|
# ;; Stop looping if space
|
|
A0300020 # CMPSKIPI.NE R0 32
|
|
0D01001F # RET R15
|
|
# ;; Stop looping if tab
|
|
A0300009 # CMPSKIPI.NE R0 9
|
|
0D01001F # RET R15
|
|
# ;; Stop looping if newline
|
|
A030000a # CMPSKIPI.NE R0 10
|
|
0D01001F # RET R15
|
|
# ;; Otherwise keep looping
|
|
3C00 @p # JUMP @throwAwayToken
|
|
|
|
|
|
# ;; Hex function
|
|
# ;; This function is serving three purposes:
|
|
# ;; Identifying hex characters
|
|
# ;; Purging line comments
|
|
# ;; Returning the converted value of a hex character
|
|
# ;; This function will alter the values of R0 R14
|
|
# ;; Returns back to whatever called it
|
|
# :hex
|
|
:7
|
|
# ;; Deal with line comments starting with #
|
|
1FE00023 # CMPUI R14 R0 35
|
|
2C5E @q # JUMP.E R14 @ascii_comment
|
|
# ;; Deal with line comments starting with ;
|
|
1FE0003b # CMPUI R14 R0 59
|
|
2C5E @q # JUMP.E R14 @ascii_comment
|
|
# ;; Deal with all ascii less than '0'
|
|
1FE00030 # CMPUI R14 R0 48
|
|
2C8E @r # JUMP.L R14 @ascii_other
|
|
# ;; Deal with '0'-'9'
|
|
1FE00039 # CMPUI R14 R0 57
|
|
2C7E @s # JUMP.LE R14 @ascii_num
|
|
# ;; Deal with all ascii less than 'A'
|
|
1FE00041 # CMPUI R14 R0 65
|
|
2C8E @r # JUMP.L R14 @ascii_other
|
|
# ;; Deal with 'A'-'F'
|
|
1FE00046 # CMPUI R14 R0 70
|
|
2C7E @t # JUMP.LE R14 @ascii_high
|
|
# ;; Deal with all ascii less than 'a'
|
|
1FE00061 # CMPUI R14 R0 97
|
|
2C8E @r # JUMP.L R14 @ascii_other
|
|
# ;; Deal with 'a'-'f'
|
|
1FE00066 # CMPUI R14 R0 102
|
|
2C7E @u # JUMP.LE R14 @ascii_low
|
|
# ;; Ignore the rest
|
|
3C00 @r # JUMP @ascii_other
|
|
# :ascii_num
|
|
:s
|
|
11000030 # SUBUI R0 R0 48
|
|
0D01001F # RET R15
|
|
# :ascii_low
|
|
:u
|
|
11000057 # SUBUI R0 R0 87
|
|
0D01001F # RET R15
|
|
# :ascii_high
|
|
:t
|
|
11000037 # SUBUI R0 R0 55
|
|
0D01001F # RET R15
|
|
# :ascii_other
|
|
:r
|
|
0D000030 # TRUE R0
|
|
0D01001F # RET R15
|
|
# :ascii_comment
|
|
:q
|
|
2D211100 # LOADUI R1 0x1100 ; Read from TAPE_01
|
|
42100100 # FGETC ; Read another char
|
|
1FE0000a # CMPUI R14 R0 10 ; Stop at the end of line
|
|
2C6E @q # JUMP.NE R14 @ascii_comment ; Otherwise keep looping
|
|
3C00 @r # JUMP @ascii_other
|
|
|
|
|
|
# ;; Where we are storing our Temp
|
|
# :Temp
|
|
:z
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
00000000 # NOP
|
|
|
|
|
|
# ;; Where we will putting our Table
|
|
# :table
|
|
:1
|