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6502bench/SourceGen/SGTestData/Source/10022-embedded-instructions.S
Andy McFadden 17dc908420 Refactor tests 1002x and 1003x
Tests 10022-embedded-instructions and 10032-flags-and-branches were
a mix of 6502 and 65816 code.  The 6502 code has been separated into
its own file, so that the tests can be run on 8-bit-only assemblers.
2020-10-18 20:30:42 -07:00

48 lines
1.3 KiB
ArmAsm

; Copyright 2018 faddenSoft. All Rights Reserved.
; See the LICENSE.txt file for distribution terms (Apache 2.0).
;
; Assembler: Merlin 32
; 65816 version
org $1000
jsr test2
jmp test6
; TEST #2: embedded with break path
;
; Example inspired by incorrect analysis...
;
; The code analyzer sees:
; beq {+03} ;jumps to the $8f
; lda #$00
; brk $8f
; and stops, then pursues the branch. If we try to walk from top
; to bottom, skipping forward by the full length of an instruction,
; we'll appear to find ourselves in the middle of an embedded
; instruction.
;
; This is different from the typical embedded instruction,
; where the inner is contained entirely within the outer.
;
; (Not sure this is interesting anymore with default 1-byte BRK.)
test2 sep #$30 ;short regs
mx %00 ;pretend they're long
lda $00 ;load something to scramble flags
beq :store1
lda #$0000
:store1 stal $012345
; Try it a different way. This creates two streams of execution.
lda $00
beq :store2
lda #$8500
:store2 stal $012345
nop
rts
; TEST #6: "embedded" off the end of the file
test6
dfb $af ;ldal