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avra: code consolidation
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52359a4e42
commit
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@ -160,8 +160,8 @@ instrTbl:
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.db 0x04, 0b01100000, 0x00 ; SBR
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.db 0x04, 0b01010000, 0x00 ; SUBI
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; k(12): XXXXkkkk kkkkkkkk
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.db 0x00, 0b11010000, 0x00 ; RCALL
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.db 0x00, 0b11000000, 0x00 ; RJMP
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.db 0x08, 0b11010000, 0x00 ; RCALL k
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.db 0x08, 0b11000000, 0x00 ; RJMP k
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; IN and OUT
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.db 0x07, 0b10110000, 0x00 ; IN
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.db 0x87, 0b10111000, 0x00 ; OUT (Bit 7)
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@ -298,7 +298,7 @@ parseInstruction:
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cp I_RCALL
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jr c, .spitRdK8
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cp I_IN
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jr c, .spitK12
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jr c, .spitk12
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cp I_BREAK
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jp c, .spitINOUT
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cp I_ASR
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@ -319,13 +319,8 @@ parseInstruction:
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rr b ; K(8) start at B's 1st bit, not 2nd
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jr .spit
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.spitK12:
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; Let's deal with the upcode constant before we destroy IX below
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ld b, (ix+1)
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call readWord
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call parseExpr
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ret nz
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push ix \ pop hl
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.spitk12:
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; k(12) in HL
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; We're doing the same dance as in _readk7. See comments there.
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ld de, 0xfff
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add hl, de
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@ -341,12 +336,12 @@ parseInstruction:
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; We're within bounds! Now, divide by 2
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ld a, l
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rr h \ rra
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; LSB in A, spit
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call ioPutB
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; LSB in A
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ld c, a
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ld a, h
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and 0xf
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or b
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jp ioPutB
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ld b, a
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jr .spit
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.spitINOUT:
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; Rd in H, A in L
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@ -473,6 +468,7 @@ parseInstruction:
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; 'a' - A 5-bit I/O port value
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; 'A' - A 6-bit I/O port value
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; 'b' - a 0-7 bit value
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; 'D' - A double-length number which will fill whole HL.
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; 'R' - an r5 value: r0-r31
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; 'r' - an r4 value: r16-r31
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;
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@ -488,6 +484,7 @@ argSpecs:
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.db 'R', 'b' ; Rd(5) + bit
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.db 'b', 7 ; bit + k(7)
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.db 'R', 'A' ; Rd(5) + A(6)
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.db 'D', 0 ; K(12)
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; Parse arguments from I/O according to specs in HL
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; H for first spec, L for second spec
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@ -540,6 +537,8 @@ _parseArgs:
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jr z, _readk7
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cp 8
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jr z, _readK8
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cp 'D'
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jr z, _readDouble
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ret ; something's wrong
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; Read expr and return success only if result in under number given in A
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@ -572,6 +571,17 @@ _readK8:
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ld a, 0xff
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jr _readExpr
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_readDouble:
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push ix
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call parseExpr
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jr nz, .end
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push ix \ pop hl
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; HL is already set. For good measure, let's set A to HL's MSB
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ld a, h
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.end:
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pop ix
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ret
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_readk7:
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push hl
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push de
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