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refactor inspect0
This commit is contained in:
4am
parent
ff2af65bb8
commit
3ad2c545c6
@ -7,9 +7,9 @@
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;-------------------------------
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!zone {
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IDBootloader
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;
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; reset all per-disk globals
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;
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lda #FALSE
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sta gIsBoot0
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sta gIsBoot1
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@ -17,25 +17,24 @@ IDBootloader
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sta gIsRWTS
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sta gIsProDOS
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sta gIsPascal
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sta gIsDatasoft
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sta gIsProtDOS
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sta gIsEA
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sta gIsEEEF
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lda #$00
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sta gLastTrack
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;
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; Quick sanity check -- only recognized values for $0800
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; are 1 or 2 for regular disks, and 5 for possible Electronic Arts.
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;
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lda $0800
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beq +
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cmp #$03
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bcc ++
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bcc .sane
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cmp #$05
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beq ++
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beq .sane
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+ jmp UseUniversal
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++
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.sane
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;
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; Copy the boot sector from $0800 to the track/sector buffer
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; so we can reuse our standard compare functions.
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@ -44,80 +43,32 @@ IDBootloader
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ldx #BASEPAGE
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ldy #$01
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jsr CopyMemory
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lda #$00
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ldx #$00
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ldy #$05
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jsr compare ; if T00,S00,$00 ==
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; This abbreviated signature matches all ProDOS disks
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; I can find, with no false positives.
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; Some disks jump to $08FF at $0804 (SOS entry point).
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; Others have a modified T00,S00 but eventually load
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; ProDOS (e.g. 1-2-3 Sequence Me, Alge-Blaster Plus,
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; Dazzle Draw, SuperPrint II)
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!byte 01,$38,$B0,$03,$4C
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ldx #TRUE
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bcc .prodos
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ldx #FALSE
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.prodos
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stx gIsProDOS
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lda #$00
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ldx #$00
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ldy #$08
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jsr compare ; if T00,S00,$00 ==
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; Apple Pascal signature (version < 1.3)
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; The wildcard in 7th position catches alternate jump
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; addresses (e.g. Wizardry I, Sundog Frozen Legacy)
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!byte $01,$E0,$60,$F0,$03,$4C,WILDCARD,$08
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ldx #TRUE
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bcc .pascal
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lda #$00
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ldx #$00
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ldy #$08
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jsr compare ; or if T00,S00,$00 ==
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; Pascal 1.3 signature [thanks Marco V.]
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!byte $01,$E0,$70,$B0,$04,$E0,$40,$B0
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ldx #TRUE
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bcc .pascal
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ldx #FALSE
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.pascal
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stx gIsPascal
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;
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; Try to identify DOS 3.3-shaped bootloader, which
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; we can maybe trace to capture the RWTS in memory.
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; Try to identify DOS 3.3-shaped bootloader.
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; Exit via custom trace function if found.
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;
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jsr IDDOS33
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bcs .notdos33
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bcs +
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lda #TRUE
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sta gIsBoot0
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lda #s_dosb0
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jsr PrintByID
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jmp TraceDOS33
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.notdos33
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;
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; Try to identify a variant bootloader that calls to $08B3
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; early to munge the nibble tables used by the drive firmware.
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; Exit via custom trace function if found.
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;
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jsr ID8b3
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bcs .not8b3
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+ jsr ID8b3
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bcs +
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lda #s_jsr8b3
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jsr PrintByID
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jmp Trace8B3
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.not8b3
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;
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; Try to identify all the different MECC fastloader variants.
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; Exit via custom trace function if found.
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;
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jsr IDMECC
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+ jsr IDMECC
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bcs .notmecc
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lda #s_mecc
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jsr PrintByID
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@ -125,73 +76,44 @@ IDBootloader
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jsr PrereadT00
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bcs .notmecc
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jsr IDMECC1
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bcs .notmecc1
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bcs +
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jmp foundmecc1
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.notmecc1
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jsr IDMECC2
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bcs .notmecc2
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+ jsr IDMECC2
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bcs +
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jmp foundmecc2
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.notmecc2
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jsr IDMECC3
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bcs .notmecc3
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+ jsr IDMECC3
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bcs +
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jmp foundmecc3
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.notmecc3
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jsr IDMECC4
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bcs .notmecc4
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+ jsr IDMECC4
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bcs .notmecc
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jmp foundmecc4
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.notmecc4
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.notmecc
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;
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; Try to identify the encrypted Datasoft bootloader.
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; Try to identify DOS 3.3P (Special Delivery) bootloader.
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; Exit via custom trace function if found.
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;
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jsr IDDatasoft
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bcs .notdatasoft
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lda #s_datasoftb0
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jsr PrintByID
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lda #TRUE
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sta gIsDatasoft
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jmp .useuniv
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.notdatasoft
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;
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; Try to identify ProDOS bootloader.
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;
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lda gIsProDOS
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bne .notprodos
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lda #s_prodosb0
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jsr PrintByID
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jmp .useuniv
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.notprodos
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;
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; Try to identify Apple Pascal bootloader (all variants).
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;
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lda gIsPascal
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bne .notpascal
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lda #s_pascalb0
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jsr PrintByID
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.notpascal
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jsr IDSpecDel
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bcs .notspecdel
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bcs +
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lda #s_specdel
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jsr PrintByID
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jmp TraceSpecDel
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.notspecdel
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;
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; Try to identify Electronic Arts bootloader.
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; Exit via custom trace function if found.
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;
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+ jsr IDEA
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bcs +
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jmp foundea
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;
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; Try to detect whether there is code in the boot sector
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; that loads 4-and-4-encoded data. This is an early escape
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; hatch for disks that are guaranteed to fail later anyway.
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;
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jsr IDEncoded44
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bcs .notencoded44
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+ jsr IDEncoded44
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bcs +
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lda #s_encoded44
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jsr PrintByID
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jmp TheEnd
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.notencoded44
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;
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; Try to detect whether there is code in the boot sector
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; that loads 5-and-3-encoded data (like DOS 3.2 disks with
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@ -200,37 +122,49 @@ IDBootloader
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; this serves as an early escape hatch for disks that are
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; guaranteed to fail later anyway.
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;
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jsr IDEncoded53
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bcs .notencoded53
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+ jsr IDEncoded53
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bcs +
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lda #s_encoded53
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jsr PrintByID
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jmp TheEnd
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.notencoded53
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;
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; Try to identify Electronic Arts bootloader.
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; ProDOS (all versions)
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;
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.tryea
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jsr IDEA
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bcs .notea
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jmp foundea
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.notea
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+ jsr IDProDOS
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bcs +
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lda #s_prodosb0
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jsr PrintByID
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lda #TRUE
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sta gIsProDOS
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beq .useuniv ; always branches
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;
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; Try to identify David-DOS bootloader
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; (no special behavior for now because all samples I have are
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; handled by built-in RWTS, so no need to trace)
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;Apple Pascal (all versions)
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;
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jsr IDDavid
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bcs .notdavid
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+ jsr IDPascal
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bcs +
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lda #s_pascalb0
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jsr PrintByID
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lda #TRUE
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sta gIsPascal
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beq .useuniv ; always branches
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;
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; Encrypted Datasoft bootloader
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;
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+ jsr IDDatasoft
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bcs +
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lda #s_datasoftb0
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jsr PrintByID
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bcc .useuniv ; always branches
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;
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; David-DOS II
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;
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+ jsr IDDavid
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bcs +
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lda #s_daviddos
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jsr PrintByID
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.notdavid
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+
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.useuniv
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;
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; We didn't recognize the boot sector, so use the universal
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; (built-in) RWTS and hope for the best
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;
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jmp UseUniversal
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}
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39
src/id/pascal.a
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39
src/id/pascal.a
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@ -0,0 +1,39 @@
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;-------------------------------
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; IDPascal
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; identify Apple Pascal bootloader
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;
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; in: $0800..$08FF contains T00,S00
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; first page of track buffer also contains T00,S00
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; out: C clear if Apple Pascal bootloader found
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; C set otherwise
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; all registers clobbered
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; all other flags clobbered
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;-------------------------------
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!zone {
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IDPascal
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;
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; Apple Pascal signature (version < 1.3)
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; The wildcard in 7th position catches alternate jump
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; addresses (e.g. Wizardry I, Sundog Frozen Legacy)
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;
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lda #$00
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ldx #$00
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ldy #$08
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jsr compare ; if T00,S00,$00 ==
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!byte $01
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!byte $E0,$60
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!byte $F0,$03
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!byte $4C,WILDCARD,$08
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bcc .exit
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;
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; Apple Pascal 1.3 signature [thanks Marco V.]
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;
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ldy #$08
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jsr compare ; or if T00,S00,$00 ==
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!byte $01
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!byte $E0,$70
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!byte $B0,$04
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!byte $E0,$40
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!byte $B0
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.exit rts
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}
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28
src/id/prodos.a
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28
src/id/prodos.a
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@ -0,0 +1,28 @@
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;-------------------------------
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; IDProDOS
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; identify ProDOS bootloader
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;
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; in: $0800..$08FF contains T00,S00
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; first page of track buffer also contains T00,S00
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; out: C clear if Apple Pascal bootloader found
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; C set otherwise
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; all registers clobbered
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; all other flags clobbered
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;-------------------------------
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!zone {
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IDProDOS
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; Some disks jump to $08FF at $0804 (SOS entry point).
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; Others have a modified T00,S00 but eventually load
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; ProDOS (e.g. 1-2-3 Sequence Me, Alge-Blaster Plus,
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; Dazzle Draw, SuperPrint II). All of these variants
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; will match.
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lda #$00
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ldx #$00
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ldy #$05
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jsr compare ; if T00,S00,$00 ==
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!byte $01
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!byte $38 ; SEC
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!byte $B0,$03 ; BCS +3
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!byte $4C ; JMP
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rts
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}
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@ -139,8 +139,10 @@ FirstMover
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!source "analyze.a"
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!source "id/inspect0.a"
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!source "id/trace.a"
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!source "id/dos33.a"
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!source "id/trace.a"
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!source "id/prodos.a"
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!source "id/pascal.a"
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!source "id/jsr8b3.a"
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!source "id/trace8b3.a"
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!source "id/mecc.a"
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@ -782,10 +784,6 @@ gIsPascal
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!byte FALSE ; 0=true, 1=false
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; reset before each operation
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; set in IDBootloader() after reading T00,S00
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gIsDatasoft
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!byte FALSE ; 0=true, 1=false
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; reset before each operation
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; set in IDBootloader() after reading T00,S00
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gIsProtDOS
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!byte FALSE ; 0=true, 1=false
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; reset before each operation
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@ -4,9 +4,8 @@
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; e.g. Video Title Shop, Tomahawk //e
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;-------------------------------
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!zone {
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_datasoft
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lda gIsDatasoft ; only ever seen this protection
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bne .exit ; on Datasoft disks (ID'd earlier)
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jsr IDDatasoft
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bcs .exit
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ldy #$06
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jsr SearchTrack
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