2017-12-30 12:34:52 +00:00
|
|
|
; IL65 internal library routines
|
|
|
|
|
;
|
|
|
|
|
; Written by Irmen de Jong (irmen@razorvine.net)
|
|
|
|
|
; License: GNU GPL 3.0, see LICENSE
|
|
|
|
|
;
|
|
|
|
|
; indent format: TABS, size=8
|
|
|
|
|
|
|
|
|
|
output raw
|
|
|
|
|
|
|
|
|
|
~ 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
|
|
|
|
|
sta zp_backup-2,x
|
|
|
|
|
inx
|
|
|
|
|
bne -
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
restore_zeropage
|
|
|
|
|
php
|
|
|
|
|
pha
|
|
|
|
|
txa
|
|
|
|
|
pha
|
|
|
|
|
sei
|
|
|
|
|
ldx #2
|
|
|
|
|
- lda zp_backup-2,x
|
|
|
|
|
sta $00,x
|
|
|
|
|
inx
|
|
|
|
|
bne -
|
|
|
|
|
cli
|
|
|
|
|
pla
|
|
|
|
|
tax
|
|
|
|
|
pla
|
|
|
|
|
plp
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
zp_backup .fill 254, 0
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
~ il65_lib {
|
2017-12-30 19:03:19 +00:00
|
|
|
; 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)
|
2017-12-30 12:34:52 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
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)
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
