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8086asm: begin adding MODRM-enabled ops
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parent
749fdf1b18
commit
210b833c71
7
blk/731
7
blk/731
@ -3,7 +3,12 @@ JMP8, L1 FWR8 ( start )
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L2 BSET ( msg )
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," Hello, World!" 0 A,
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L1 FSET ( start )
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AH 0x42 MOVri,
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CLI,
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AH 0 MOVri,
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AL 2 MOVri,
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0x10 INT,
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SI L2 @ ( msg ) MOVrI,
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AH 0x0e MOVri,
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LODSB,
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AL AL ORrr,
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PC ORG @ DUMP
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6
blk/752
6
blk/752
@ -1,2 +1,8 @@
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( Splits word into msb/lsb, lsb being on TOS )
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: SPLITB
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256 /MOD SWAP
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;
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: PC H@ ORG @ - ;
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: A, C, ;
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( dst8 src8 -- modrm )
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: MODRMrr 0x7 AND 3 LSHIFT SWAP 0x7 AND OR 0xc0 OR ;
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5
blk/753
5
blk/753
@ -1,6 +1,9 @@
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: MOVri, SWAP 0xb0 OR A, A, ;
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: MOVrI, SWAP 0xb0 OR A, 256 /MOD A, A, ;
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: MOVrI, SWAP 0xb0 OR A, SPLITB A, A, ;
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: INT, 0xcd A, A, ;
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( no argument, flow ops are special )
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: JMP8, 0xeb A, ;
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: JMP16, 0xe9 A, ;
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: LODSB, 0xac A, ;
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: CLI, 0xfa A, ;
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: ORrr, 0x08 A, MODRMrr A, ;
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