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89 lines
1.4 KiB
Plaintext
89 lines
1.4 KiB
Plaintext
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; IL65 internal library routines
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;
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; Written by Irmen de Jong (irmen@razorvine.net)
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; License: GNU GPL 3.0, see LICENSE
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;
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; indent format: TABS, size=8
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output raw
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~ il65_lib_zp {
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; note: separate block so the 64tass assembler can remove this when no zp restore is required
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asm {
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; ---- store the Zeropage in a backup area
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save_zeropage
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sei
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ldx #2
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- lda $00,x
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sta zp_backup-2,x
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inx
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bne -
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rts
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restore_zeropage
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php
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pha
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txa
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pha
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sei
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ldx #2
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- lda zp_backup-2,x
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sta $00,x
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inx
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bne -
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cli
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pla
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tax
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pla
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plp
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rts
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zp_backup .fill 254, 0
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}
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}
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~ il65_lib {
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; note: the following two ZP scratch registers must be the same as in c64lib
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memory SCRATCH_ZP1 = $02 ; scratch register #1 in ZP
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memory SCRATCH_ZP2 = $03 ; scratch register #2 in ZP
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asm {
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; ---- jmp (indirect) routines for register pairs containing the indirect address
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jsr_indirect_nozpuse_AX
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sta jsr_indirect_tmp
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stx jsr_indirect_tmp+1
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jmp (jsr_indirect_tmp)
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jsr_indirect_nozpuse_AY
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sta jsr_indirect_tmp
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sty jsr_indirect_tmp+1
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jmp (jsr_indirect_tmp)
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jsr_indirect_nozpuse_XY
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stx jsr_indirect_tmp
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sty jsr_indirect_tmp+1
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jmp (jsr_indirect_tmp)
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jsr_indirect_tmp
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.byte 0, 0
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jsr_indirect_AX
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sta SCRATCH_ZP1
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stx SCRATCH_ZP2
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jmp (SCRATCH_ZP1)
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jsr_indirect_AY
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sta SCRATCH_ZP1
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sty SCRATCH_ZP2
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jmp (SCRATCH_ZP1)
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jsr_indirect_XY
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stx SCRATCH_ZP1
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sty SCRATCH_ZP2
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jmp (SCRATCH_ZP1)
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}
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}
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