prog8/lib/il65lib.ill

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; IL65 internal library routines
;
; Written by Irmen de Jong (irmen@razorvine.net)
; License: GNU GPL 3.0, see LICENSE
;
; indent format: TABS, size=8
~ il65_lib_zp {
; note: separate block so the 64tass assembler can remove this when no zp restore is required
asm {
; ---- store the Zeropage in a backup area
save_zeropage
sei
ldx #2
- lda $00,x
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sta zp_backup,x
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inx
bne -
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cli
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rts
restore_zeropage
php
pha
txa
pha
sei
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lda $a0 ; save the current jiffy clock
sta zp_backup+$a0
lda $a1
sta zp_backup+$a1
lda $a2
sta zp_backup+$a2
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ldx #2
- lda zp_backup-2,x
sta $00,x
inx
bne -
cli
pla
tax
pla
plp
rts
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zp_backup .fill 256, 0
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}
}
~ il65_lib {
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; note: the following ZP scratch registers must be the same as in c64lib
memory .byte SCRATCH_ZP1 = $02 ; scratch register #1 in ZP
memory .byte SCRATCH_ZP2 = $03 ; scratch register #2 in ZP
memory .word SCRATCH_ZPWORD1 = $fb ; scratch word in ZP ($fb/$fc)
memory .word SCRATCH_ZPWORD2 = $fd ; scratch word in ZP ($fd/$fe)
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asm {
; ---- jmp (indirect) routines for register pairs containing the indirect address
jsr_indirect_nozpuse_AX
sta jsr_indirect_tmp
stx jsr_indirect_tmp+1
jmp (jsr_indirect_tmp)
jsr_indirect_nozpuse_AY
sta jsr_indirect_tmp
sty jsr_indirect_tmp+1
jmp (jsr_indirect_tmp)
jsr_indirect_nozpuse_XY
stx jsr_indirect_tmp
sty jsr_indirect_tmp+1
jmp (jsr_indirect_tmp)
jsr_indirect_tmp
.byte 0, 0
jsr_indirect_AX
sta SCRATCH_ZP1
stx SCRATCH_ZP2
jmp (SCRATCH_ZP1)
jsr_indirect_AY
sta SCRATCH_ZP1
sty SCRATCH_ZP2
jmp (SCRATCH_ZP1)
jsr_indirect_XY
stx SCRATCH_ZP1
sty SCRATCH_ZP2
jmp (SCRATCH_ZP1)
}
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asm {
; ---- copy a 5 byte MFLT floating point variable to another place
; input: X/Y = source address, SCRATCH_ZPWORD1 = destination address
copy_mflt stx SCRATCH_ZP1
sty SCRATCH_ZPWORD1+1
ldy #0
lda (SCRATCH_ZP1),y
sta (SCRATCH_ZPWORD1),y
iny
lda (SCRATCH_ZP1),y
sta (SCRATCH_ZPWORD1),y
iny
lda (SCRATCH_ZP1),y
sta (SCRATCH_ZPWORD1),y
iny
lda (SCRATCH_ZP1),y
sta (SCRATCH_ZPWORD1),y
iny
lda (SCRATCH_ZP1),y
sta (SCRATCH_ZPWORD1),y
ldy SCRATCH_ZPWORD1+1
rts
}
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asm {
; ---- add 1 to the MFLT pointed to by X/Y. Clobbers A, X, Y
float_add_one
stx SCRATCH_ZP1
sty SCRATCH_ZP2
txa
jsr c64.MOVFM ; fac1 = float XY
lda #<c64.FL_FONE
ldy #>c64.FL_FONE
jsr c64.FADD ; fac1 += 1
ldx SCRATCH_ZP1
ldy SCRATCH_ZP2
jmp c64.FTOMEMXY ; float XY = fac1
; ---- subtract 1 from the MFLT pointed to by X/Y. Clobbers A, X, Y
float_sub_one
stx SCRATCH_ZP1
sty SCRATCH_ZP2
lda #<c64.FL_FONE
ldy #>c64.FL_FONE
jsr c64.MOVFM ; fac1 = 1
txa
ldy SCRATCH_ZP2
jsr c64.FSUB ; fac1 = float XY - 1
ldx SCRATCH_ZP1
ldy SCRATCH_ZP2
jmp c64.FTOMEMXY ; float XY = fac1
}
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}