mirror of
https://github.com/fadden/6502bench.git
synced 2024-07-14 05:28:55 +00:00
17dc908420
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.
48 lines
1.3 KiB
ArmAsm
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
|