119 lines
3.3 KiB
Plaintext
119 lines
3.3 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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2D2A000f # LOADUI R10 0x0F ; Byte mask
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2D2B0001 # LOADUI R11 1 ; Our toggle
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2D2D0600 # LOADUI R13 0x600 ; Where we are starting our Stack
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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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# 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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12E00000 # CMPI R14 R0 0
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2C4E0008 # JUMP.GE R14 @.L1
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2D0D00c4 # CALLI R13 @finish
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# .L1
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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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2D0D0038 # CALLI R13 @hex ; Convert it
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12E00000 # CMPI R14 R0 0 ; Check if it is hex
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2C8Effdc # 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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3C00ffcc # 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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2D1B0001 # LOADI R11 1 ; 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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3C00ffb0 # JUMP @loop ; Try to get more bytes
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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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