make stage0 monitor 4 bytes smaller by using FALSE to put zero in R1
This commit is contained in:
Dmitry Petukhov
parent
af2508e2a1
commit
0e3d05fafc
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@ -37,7 +37,7 @@ gcc Linux\ Bootstrap/hex.c -o bin/hex
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Then we can use it to make our bootstrap binary:
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./bin/hex < stage0/stage0_monitor.hex0 > roms/stage0_monitor
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Which should have the sha256sum of 23929c57f41414f57583457d0500f22b5b1c80f39c79522e23c8b13e5afb191d
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Which should have the sha256sum of 792e2be913921dd55a28f55dcf2e6b1523d34fdbccc27c38f77e74c99ef97a4b
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* Step 2 create a hex assembler
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Now that we have a Hex monitor, we are now capable of either creating a text file (no ability to correct mistakes along the way) or any arbitrary hex program we want.
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@ -29,7 +29,7 @@ E0002D201101 # LOADUI R0 0x1101
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42100001 # FOPEN_WRITE
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# :loop 24
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E0002D210000 # LOADUI R1 0 ; Read from tty
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0D000021 # FALSE R1 ; Read from tty
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42100100 # FGETC ; Read a Char
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E000A030000d # CMPSKIPI.NE R0 13 ; Replace all CR
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E0002D20000a # LOADUI R0 10 ; WIth LF
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@ -38,10 +38,10 @@ E0002D20000a # LOADUI R0 10 ; WIth LF
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# ;; Check for Ctrl-D
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E000A0300004 # CMPSKIPI.NE R0 4
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3C000112 # JUMP @finish
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3C000110 # JUMP @finish
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# ;; Check for EOF
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E0002CC0010c # JUMP.NP R0 @finish
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E0002CC0010a # JUMP.NP R0 @finish
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# ;; Write out unprocessed byte
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E0002D211101 # LOADUI R1 0x1101 ; Write to TAPE_02
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@ -51,7 +51,7 @@ E0002D211101 # LOADUI R1 0x1101 ; Write to TAPE_02
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E0002D0D003e # CALLI R13 @hex ; Convert it
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# ;; Get another byte if nonhex
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E0002CC0ffc0 # JUMP.NP R0 @loop ; Don't use nonhex chars
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E0002CC0ffc2 # JUMP.NP R0 @loop ; Don't use nonhex chars
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# ;; Deal with the case of second nybble
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E0002C9B000e # JUMP.Z R11 @second_nybble ; Jump if toggled
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@ -59,10 +59,10 @@ E0002C9B000e # JUMP.Z R11 @second_nybble ; Jump if toggled
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# ;; Process first byte of pair
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E100B0F0000f # ANDI R15 R0 0x0F ; Store First nibble
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0D00002B # FALSE R11 ; Flip the toggle
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3C00ffac # JUMP @loop
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3C00ffae # JUMP @loop
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# ;; Combined second nybble in pair with first
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# :second_nybble 78
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# :second_nybble 76
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E0002D5F0004 # SL0I R15 4 ; Shift our first nibble
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E100B000000f # ANDI R0 R0 0x0F ; Mask out top
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0500000F # ADD R0 R0 R15 ; Combine nibbles
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@ -71,9 +71,9 @@ E100B000000f # ANDI R0 R0 0x0F ; Mask out top
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E0002D1B0001 # LOADI R11 1 ; Flip the toggle
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E0002D211100 # LOADUI R1 0x1100 ; Write the combined byte
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42100200 # FPUTC ; To TAPE_01
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3C00ff88 # JUMP @loop ; Try to get more bytes
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3C00ff8a # JUMP @loop ; Try to get more bytes
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# :hex 9c
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# :hex 9a
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# ;; Deal with line comments starting with #
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E1001FE00023 # CMPUI R14 R0 35
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E0002C5E007e # JUMP.E R14 @ascii_comment
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@ -109,24 +109,24 @@ E0002C7E000e # JUMP.LE R14 @ascii_low
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# ;; Ignore the rest
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3C00001e # JUMP @ascii_other
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# :ascii_num 100
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# :ascii_num FD
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E10011000030 # SUBUI R0 R0 48
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0D01001D # RET R13
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# :ascii_low 10a
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# :ascii_low 108
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E10011000057 # SUBUI R0 R0 87
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0D01001D # RET R13
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# :ascii_high 114
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# :ascii_high 112
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E10011000037 # SUBUI R0 R0 55
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0D01001D # RET R13
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# :ascii_other 11e
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# :ascii_other 11c
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0D000030 # TRUE R0
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0D01001D # RET R13
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# :ascii_comment 126
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E0002D210000 # LOADUI R1 0 ; Read from tty
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# :ascii_comment 124
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0D000021 # FALSE R1 ; Read from tty
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42100100 # FGETC ; Read another char
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E000A030000d # CMPSKIPI.NE R0 13 ; Replace all CR
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E0002D20000a # LOADUI R0 10 ; WIth LF
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@ -134,10 +134,10 @@ E0002D20000a # LOADUI R0 10 ; WIth LF
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E1001FE0000a # CMPUI R14 R0 10 ; Stop at the end of line
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E0002D211101 # LOADUI R1 0x1101 ; Write to TAPE_02
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42100200 # FPUTC ; The char we just read
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E0002C6Effd0 # JUMP.NE R14 @ascii_comment ; Otherwise keep looping
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3C00ffc4 # JUMP @ascii_other
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E0002C6Effd2 # JUMP.NE R14 @ascii_comment ; Otherwise keep looping
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3C00ffc6 # JUMP @ascii_other
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# :finish 15a
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# :finish 156
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E0002D201100 # LOADUI R0 0x1100 ; Close TAPE_01
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42100002 # FCLOSE
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E0002D201101 # LOADUI R0 0x1101 ; Close TAPE_02
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@ -29,7 +29,7 @@
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FOPEN_WRITE
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:loop
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LOADUI R1 0 ; Read from tty
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FALSE R1 ; Read from tty
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FGETC ; Read a Char
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CMPSKIPI.NE R0 13 ; Replace all CR
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@ -115,7 +115,7 @@
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TRUE R0
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RET R13
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:ascii_comment
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LOADUI R1 0 ; Read from tty
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FALSE R1 ; Read from tty
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FGETC ; Read another char
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CMPSKIPI.NE R0 13 ; Replace all CR
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LOADUI R0 10 ; WIth LF
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@ -5,7 +5,7 @@ f4bbf9e9c4828170d0c153ac265382dc705643f95efd2a029243326d426be5a4 roms/forth
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2b80849180d5fb3757bcca2471b6337808e5b5ca80b18d93fa82ddef0435b84b roms/lisp
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3020b194ead31ae19ba66fc35ed95465514373f6005896350d1608c9efabbdca roms/M0
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059d38e34275029f2de5f600f08fe01bd13cd173f7da58e3fbec7114074beff2 roms/SET
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23929c57f41414f57583457d0500f22b5b1c80f39c79522e23c8b13e5afb191d roms/stage0_monitor
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792e2be913921dd55a28f55dcf2e6b1523d34fdbccc27c38f77e74c99ef97a4b roms/stage0_monitor
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13b45134a88c1c6db349cb40f82269cee9edfce71ac644dc0e137bad053bf5ce roms/stage1_assembler-0
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156f555fce5b02f52445652b1ed0b443295706cdfbe23c5a021bd4efc77179bb roms/stage1_assembler-1
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2c02c50958f489a660a4915d2a9e207a0c61f411d42628bdaf4dcf6bf7149a9d roms/stage1_assembler-2
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