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5 Commits
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2e23b84fc1
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fd597d29d2 |
6
blk/204
6
blk/204
@ -8,3 +8,9 @@ byte that is taken care of. We still need to adjust by another
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byte before writing the offset.
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byte before writing the offset.
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(cont.)
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16
blk/205
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16
blk/205
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@ -0,0 +1,16 @@
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Structured flow
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z80a also has words that behave similarly to IF..THEN and
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BEGIN..UNTIL.
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On the IF side, we have IFZ, IFNZ, IFC, IFNC, and THEN,. When
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the opposite condition is met, a relative jump is made to
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THEN,'s PC. For example, if you have IFZ, a jump is made when
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Z is unset.
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On the BEGIN,..AGAIN, side, it's a bit different. You start
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with your BEGIN, instruction, and then later you issue a
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JRxx, instr followed by AGAIN,. Exactly like you would do
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with a label.
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(cont.)
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3
blk/206
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3
blk/206
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@ -0,0 +1,3 @@
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On top of that, you have the very nice BREAK, instruction,
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which must also be preceeded by a JRxx, and will jump to the
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PC following the next AGAIN,
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9
blk/246
9
blk/246
@ -1,13 +1,16 @@
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( Place BEGIN, where you want to jump back and AGAIN after
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( Place BEGIN, where you want to jump back and AGAIN after
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a relative jump operator. Just like BSET and BWR. )
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a relative jump operator. Just like BSET and BWR. )
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: BEGIN, PC ;
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: BEGIN, PC ;
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: AGAIN, PC - 1- A, ;
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: BSET PC SWAP ! ;
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: BSET PC SWAP ! ;
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: BWR @ AGAIN, ;
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( same as BSET, but we need to write a placeholder )
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( same as BSET, but we need to write a placeholder )
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: FJR, PC 0 A, ;
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: FJR, PC 0 A, ;
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: IFZ, JRNZ, FJR, ;
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: IFZ, JRNZ, FJR, ;
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: IFNZ, JRZ, FJR, ;
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: IFNZ, JRZ, FJR, ;
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: IFC, JRNC, FJR, ;
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: IFC, JRNC, FJR, ;
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: IFNC, JRC, FJR, ;
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: IFNC, JRC, FJR, ;
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: THEN,
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DUP PC ( l l pc )
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-^ 1- ( l off )
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( warning: l is a PC offset, not a mem addr! )
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SWAP ORG @ + BIN( @ - ( off addr )
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C! ;
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13
blk/247
13
blk/247
@ -1,9 +1,8 @@
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: THEN,
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DUP PC ( l l pc )
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-^ 1- ( l off )
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( warning: l is a PC offset, not a mem addr! )
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SWAP ORG @ + BIN( @ - ( off addr )
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C!
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;
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: FWR BSET 0 A, ;
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: FWR BSET 0 A, ;
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: FSET @ THEN, ;
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: FSET @ THEN, ;
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: BREAK, FJR, 0x8000 OR ;
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: BREAK?, DUP 0x8000 AND IF
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0x7fff AND 1 ALLOT THEN, -1 ALLOT
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THEN ;
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: AGAIN, BREAK?, PC - 1- A, ;
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: BWR @ AGAIN, ;
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2
blk/291
2
blk/291
@ -13,4 +13,4 @@ PC ORG @ 4 + ! ( find )
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NEG,
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NEG,
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A DECr,
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A DECr,
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( special case. zero len? we never find anything. )
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( special case. zero len? we never find anything. )
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JRZ, L1 FWR ( fail-B296 ) ( cont. )
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IFNZ, ( fail-B296 ) ( cont. )
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blk/293
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blk/293
@ -1,16 +1,15 @@
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JRNZ, L2 FWR ( loopend )
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IFZ,
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( match, let's compare the string then )
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( match, let's compare the string then )
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DE DECss, ( Skip prev field. One less because we )
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DE DECss, ( Skip prev field. One less because we )
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DE DECss, ( pre-decrement )
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DE DECss, ( pre-decrement )
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B C LDrr, ( loop C times )
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B C LDrr, ( loop C times )
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BEGIN, ( loop )
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BEGIN,
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( pre-decrement for easier Z matching )
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( pre-decrement for easier Z matching )
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DE DECss,
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DE DECss,
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HL DECss,
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HL DECss,
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LDA(DE),
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LDA(DE),
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(HL) CPr,
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(HL) CPr,
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JRNZ, L3 FWR ( loopend )
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JRNZ, BREAK,
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DJNZ, AGAIN, ( loop )
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DJNZ, AGAIN,
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L2 FSET L3 FSET ( loopend )
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THEN,
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( cont. )
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( cont. )
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2
blk/296
2
blk/296
@ -1,4 +1,4 @@
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L1 FSET ( fail )
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THEN, ( zero length check, B291 )
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A XORr,
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A XORr,
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A INCr,
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A INCr,
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L2 FSET ( end )
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L2 FSET ( end )
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8
blk/328
8
blk/328
@ -2,15 +2,13 @@ CODE S=
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DE POPqq,
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DE POPqq,
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HL POPqq,
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HL POPqq,
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chkPS,
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chkPS,
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BEGIN, ( loop )
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BEGIN,
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LDA(DE),
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LDA(DE),
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(HL) CPr,
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(HL) CPr,
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JRNZ, L1 FWR ( not equal? break early to "end".
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JRNZ, BREAK, ( not equal? break early. NZ is set. )
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NZ is set. )
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A ORr, ( if our char is null, stop )
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A ORr, ( if our char is null, stop )
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HL INCss,
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HL INCss,
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DE INCss,
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DE INCss,
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JRNZ, AGAIN, ( loop )
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JRNZ, AGAIN,
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L1 FSET ( end )
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PUSHZ,
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PUSHZ,
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;CODE
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;CODE
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3
blk/662
3
blk/662
@ -1,5 +1,6 @@
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( 0000 000d dddd 0000 )
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( 0000 000d dddd 0000 )
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: OPRd CREATE , DOES> @ SWAP 4 LSHIFT OR A,, ;
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: _Rdp ( op rd -- op' place Rd ) 4 LSHIFT OR ;
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: OPRd CREATE , DOES> @ SWAP _Rdp A,, ;
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0b1001010000000101 OPRd ASR, 0b1001010000000000 OPRd COM,
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0b1001010000000101 OPRd ASR, 0b1001010000000000 OPRd COM,
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0b1001010000001010 OPRd DEC, 0b1001010000000011 OPRd INC,
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0b1001010000001010 OPRd DEC, 0b1001010000000011 OPRd INC,
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0b1001001000000110 OPRd LAC, 0b1001001000000101 OPRd LAS,
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0b1001001000000110 OPRd LAC, 0b1001001000000101 OPRd LAS,
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3
blk/663
3
blk/663
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( 0000 00rd dddd rrrr )
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( 0000 00rd dddd rrrr )
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: OPRdRr CREATE C, DOES> C@ ( rd rr op )
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: OPRdRr CREATE C, DOES> C@ ( rd rr op )
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OVER 0x10 AND 3 RSHIFT OR ( rd rr op' )
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OVER 0x10 AND 3 RSHIFT OR ( rd rr op' )
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2 PICK 0x10 AND 4 RSHIFT OR ( rd rr op' )
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8 LSHIFT OR 0xff0f AND ( rd op' )
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8 LSHIFT OR 0xff0f AND ( rd op' )
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SWAP 0xf AND 4 LSHIFT OR A,, ;
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SWAP _Rdp A,, ;
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0x1c OPRdRr ADC, 0x0c OPRdRr ADD, 0x20 OPRdRr AND,
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0x1c OPRdRr ADC, 0x0c OPRdRr ADD, 0x20 OPRdRr AND,
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0x14 OPRdRr CP, 0x04 OPRdRr CPC, 0x10 OPRdRr CPSE,
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0x14 OPRdRr CP, 0x04 OPRdRr CPC, 0x10 OPRdRr CPSE,
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0x24 OPRdRr EOR, 0x2c OPRdRr MOV, 0x9c OPRdRr MUL,
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0x24 OPRdRr EOR, 0x2c OPRdRr MOV, 0x9c OPRdRr MUL,
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6
blk/664
6
blk/664
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0x70 OPRdK ANDI, 0x30 OPRdK CPI, 0x0e OPRdK LDI,
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0x70 OPRdK ANDI, 0x30 OPRdK CPI, 0x0e OPRdK LDI,
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0x60 OPRdK ORI, 0x40 OPRdK SBCI, 0x60 OPRdK SBR,
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0x60 OPRdK ORI, 0x40 OPRdK SBCI, 0x60 OPRdK SBR,
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0x50 OPRdK SUBI,
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0x50 OPRdK SUBI,
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( 0000 0000 AAAA Abbb )
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: OPAb CREATE C, DOES> C@ ( A b op )
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ROT 3 LSHIFT ROT OR A, A, ;
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0x98 OPAb CBI, 0x9a OPAb SBI, 0x99 OPAb SBIC,
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0x9b OPAb SBIS,
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11
blk/665
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11
blk/665
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: OPNA CREATE , DOES> @ A,, ;
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0x9598 OPNA BREAK, 0x9488 OPNA CLC, 0x94d8 OPNA CLH,
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0x94f8 OPNA CLI, 0x94a8 OPNA CLN, 0x94c8 OPNA CLS,
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0x94e8 OPNA CLT, 0x94b8 OPNA CLV, 0x9498 OPNA CLZ,
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0x9419 OPNA EIJMP, 0x9509 OPNA ICALL, 0x9519 OPNA EICALL,
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0x9409 OPNA IJMP, 0x0000 OPNA NOP, 0x9508 OPNA RET,
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0x9518 OPNA RETI, 0x9408 OPNA SEC, 0x9458 OPNA SEH,
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0x9478 OPNA SEI, 0x9428 OPNA SEN, 0x9448 OPNA SES,
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0x9468 OPNA SET, 0x9438 OPNA SEV, 0x9418 OPNA SEZ,
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0x9588 OPNA SLEEP, 0x95a8 OPNA WDR,
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Reference in New Issue
Block a user