2018-09-28 17:05:11 +00:00
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; Copyright 2018 faddenSoft. All Rights Reserved.
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; See the LICENSE.txt file for distribution terms (Apache 2.0).
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;
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; Assembler: Merlin 32
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2020-10-19 03:30:42 +00:00
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; 65816 version
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2018-09-28 17:05:11 +00:00
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org $1000
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clc
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xce
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sep #$ff ;set all flags
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mx %11
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; clear individual flags with REP
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sep #$ff
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rep #$80
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rep #$40
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rep #$20
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rep #$10
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rep #$08
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rep #$04
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rep #$02
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rep #$01
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; exercise SEP/REP with #$00
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sep #$00
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sep #$ff
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rep #$00
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rep #$ff
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; confirm emulation behavior
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mx %00 ;long regs
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lda #$feed ;check it
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sec
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xce ;emulation mode
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lda #$ff ;check it
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rep #$30 ;should have no effect...
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mx %11 ;...but Merlin32 doesn't know that
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lda #$ff
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clc
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xce ;back to native, should set M/X=1
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lda #$ff ;check it
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; try one long, one short
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rep #$20 ;long a
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sep #$10 ;short x/y
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mx %01
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lda #$0000
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ldx #$01
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ldy #$02
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sep #$20 ;short a
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rep #$10 ;long x/y
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mx %10
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lda #$01
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ldx #$0000
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ldy #$0000
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; check branch instructions; NVMXDIZC
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sep #$30
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mx %11
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lda #$00
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pha
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plp ;without a nearby PHP, flags will be scrambled
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rep #$80
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bpl ok_bpl
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brk $00
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ok_bpl sep #$80
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bpl :bad ;branch never taken
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bmi ok_bmi
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:bad brk $00
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ok_bmi rep #$40
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bvc ok_bvc
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brk $00
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ok_bvc sep #$40
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bvs ok_bvs
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brk $00
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ok_bvs rep #$01
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bcc ok_bcc
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brk $00
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ok_bcc sep #$01
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bcs ok_bcs
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brk $00
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ok_bcs rep #$02
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bne ok_bne
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brk $00
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ok_bne sep #$02
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beq ok_beq
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brk $00
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ok_beq
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2020-10-19 03:30:42 +00:00
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; Test M/X behavior across PHP/PLP. The flags should be left alone
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; (non-smart mode), or set to whatever they were on the previous PHP
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; (smart mode).
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rep #$20
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2018-09-28 17:05:11 +00:00
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php
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plp ;should restore cleared carry
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2020-10-19 03:30:42 +00:00
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lda #$1234
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sep #$20
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php
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plp
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lda #$12
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2019-09-17 21:38:16 +00:00
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2020-10-19 03:30:42 +00:00
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; test tracking M/X across subroutine calls
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2018-09-28 17:05:11 +00:00
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rep #$20 ;long a
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sep #$10 ;short x/y
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mx %01
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jsr long_subr ;confirm flag propagation
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rep #$30
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mx %00
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jsr ambig_subr
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sep #$30
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mx %11
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jsr ambig_subr
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rep #$20 ;long a
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sep #$10 ;short x/y
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mx %01
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jsr long_subr ;call it again
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; leave the main routine with short flags set
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sep #$30
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mx %11
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2020-10-19 03:30:42 +00:00
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jmp done
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2018-09-28 17:05:11 +00:00
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; only called with longm/shortx
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mx %01
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long_subr
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lda #$1234
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ldx #$ff
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rts
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; this is called with different values for M/X, so it defaults to short
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mx %11
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ambig_subr
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lda #$ff
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ldx #$ee
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ldy #$dd
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rts
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2020-10-19 03:30:42 +00:00
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done
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rts
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