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collapseos/blk/754
Virgil Dupras 6bc1738bfd pcat: implement (loop)
8086 asm is a lot terser than z80... Those indirect memory operations
are very handy.
2020-06-18 15:01:04 -04:00

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: OPrr CREATE C, DOES> C@ A, 3 LSHIFT OR 0xc0 OR A, ;
0x31 OPrr XORxx, 0x30 OPrr XORrr,
0x88 OPrr MOVrr, 0x89 OPrr MOVxx, 0x28 OPrr SUBrr,
0x29 OPrr SUBxx, 0x08 OPrr ORrr, 0x09 OPrr ORxx,
0x3a OPrr CMPrr, 0x3b OPrr CMPxx, 0x00 OPrr ADDrr,
0x01 OPrr ADDxx,
: OPm ( modrm op ) CREATE C, C, DOES> C@+ A, C@ OR A, ;
0 0xff OPm INC[w], 0 0xfe OPm INC[b],
0x8 0xff OPm DEC[w], 0x8 0xfe OPm DEC[b],
0x30 0xff OPm PUSH[w], 0 0x8f OPm POP[w],
: OPm+ ( modrm op ) CREATE C, C, DOES>
( m off ) C@+ A, C@ ROT OR A, A, ;
0x40 0xff OPm+ INC[w]+, 0x40 0xfe OPm+ INC[b]+,
0x48 0xff OPm+ DEC[w]+, 0x48 0xfe OPm+ DEC[b]+,
0x70 0xff OPm+ PUSH[w]+, 0x40 0x8f OPm+ POP[w]+,