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https://git.sr.ht/~rabbits/uxn
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80 lines
1.6 KiB
Tal
80 lines
1.6 KiB
Tal
|00 @System &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1
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|0100
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;on-halt .System/vector DEO2
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( underflow ) POP
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( overflow ) #00 &l #ffff ROT INC DUP ?&l POP
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( divzero ) #02 #00 DIV
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#80 .System/halt DEO
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BRK
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@on-halt ( addr* inst code -> )
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#00 SWP DUP ADD ;err ADD2 LDA2 pstr
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;dict/error pstr
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print-opcode
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;dict/at pstr
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phex LIT2 0a ". #18 DEO #18 DEO
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#01 .System/halt DEO
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BRK
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@print-opcode ( byte -- )
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DUP #20 EQU ?&jci
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DUP #40 EQU ?&jmi
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DUP #60 EQU ?&jsi
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DUP #00 EQU ?&brk
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#00 OVR #1f AND #20 SFT2 ;opcodes ADD2 pstr
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DUP #20 AND #00 EQU ?&no-2 LIT "2 #18 DEO &no-2
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DUP #1f AND #00 EQU ?&no-k
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DUP #80 AND #00 EQU ?&no-k LIT "k #18 DEO &no-k
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DUP #40 AND #00 EQU ?&no-r LIT "r #18 DEO &no-r
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POP
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JMP2r
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&brk POP ;opcodes/brk !pstr
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&jmi POP ;opcodes/jmi !pstr
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&jci POP ;opcodes/jci !pstr
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&jsi POP ;opcodes/jsi !pstr
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@phex ( short* -- )
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SWP phex/b
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&b ( byte -- ) DUP #04 SFT phex/c
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&c ( char -- ) #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO
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JMP2r
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@pstr ( str* -- )
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&w
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LDAk #18 DEO
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INC2 LDAk ,&w JCN
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POP2
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JMP2r
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@err
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=dict/unknown
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=dict/underflow
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=dict/overflow
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=dict/divzero
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@dict
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&error "Error, 20 "during 20 $1
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&unknown "Unkown 20 $1
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&underflow "Underflow 20 $1
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&overflow "Overflow 20 $1
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&divzero "Division 20 "by 20 "zero 20 $1
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&at ", 20 "at 20 "# $1
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@opcodes
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"LIT $1 "INC $1 "POP $1 "NIP $1 "SWP $1 "ROT $1 "DUP $1 "OVR $1
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"EQU $1 "NEQ $1 "GTH $1 "LTH $1 "JMP $1 "JCN $1 "JSR $1 "STH $1
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"LDZ $1 "STZ $1 "LDR $1 "STR $1 "LDA $1 "STA $1 "DEI $1 "DEO $1
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"ADD $1 "SUB $1 "MUL $1 "DIV $1 "AND $1 "ORA $1 "EOR $1 "SFT $1
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&brk "BRK $1 &jmi "JMI $1 &jci "JCI $1 &jsi "JSI $1
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