/
comm-patch.asm
981 lines (790 loc) · 12.7 KB
/
comm-patch.asm
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;;;
;;; Register addresses
;;;
#org $40f0
#var FIFO_DATA, 1
#var FIFO_STATUS, 1
;;; SRAM Table for Freezes
;;; Format - FF AA AA VV MM SS WW CA CA CV CS CT XX XX XX XX
; 0 FF - Used flag/fingerprint - AB indicates valid in-use slot
; 1-2 AA - Address
; 3 VV - Value
; 4 MM - Mask
; 5 SS - Size
; 6 WW - Write Type
; 7-8 CA - Compare Address
; 9 CV - Compare Value
; A CS - Compare Size
; B CT - Compare Type
; C-F XX - Unused/Expansion
#org $7F00
FreezeTable:
#org $7F80
FreezeScratch:
;Non SRAM value to detect freeze table needing to be initialized
#org $07FF
FreezeInit:
#org $07A1
CommReady:
;;;
;;; Variables in zero page to make code size small
;;;
#org $7DCC
#var payloadOffset, 1
#var payloadNewValue, 1
#var payloadOldValue, 1
#var payloadSize, 1
;;;
;;; Bottom of stack area, used as scratch area to put code into from usb communications.
;;;
#org $0180;
codeScratchArea:
#org $07A2
messageReturn:
;;;
;;; The usb write message header. This never changes, so it can just sit in rom and be copied.
;;;
#org $D920, $1D930, $C
sendItemStateChangeMsgHeader:
; n8pro protocol header, '+', '+'^0xff, CMD_USB_WR, CMD_USB_WR^0xff, len in LE BO
#byte '+', $2b ^ $ff, $22, $22 ^ $ff
#byte 4, 0
; our header, 'i' for 'item'.
#byte 'i'
sendItemStateChangeMsgHeaderEnd:
;;;
;;; nmi hook function to check for code dump from usb interface, loads code into ram and jumps to it
;;; it's up to the host to include code to signal that it has successfully handled the data
;;; by writing a completion message to the fifo.
;;;
#org $D8ED, $1D8FD
JMP usbDataHook
#org $D940, $1D950
usbDataHook:
;LDA CommReady
;CMP #$AB
;BEQ .done
lda FIFO_STATUS
bmi .done
cmp #$40 ; extra check for special value mesen returns for unknown registers so we don't break everything
beq .done
lda FIFO_DATA
CMP #$40
beq .done
sta payloadSize
ldx #$0
.loop:
cpx payloadSize
beq .success
.waitByteLoop:
.doread:
;lda FIFO_STATUS
;bmi .waitByteLoop
lda FIFO_DATA
sta codeScratchArea,X
inx
jmp .loop
.success:
:
LDA FIFO_STATUS
BMI :+
LDA FIFO_DATA
JMP :-
:
LDA #$AB
STA CommReady
.done:
LDA $07F5
JMP $D8F0
;In level hijack
#org $AFBD, $1AFCD
JSR MainFunc
NOP
;Main routine hijack instead of NMI
#org $DA00, $1DA10
MainFunc:
SEI
LDA $02
PHA
LDA $03
PHA
LDA $0F
PHA
LDA $05
PHA
LDA CommReady
CMP #$AB
BNE :+
JSR CommFunc
LDA #$00
STA CommReady
:
JSR ExecuteFreezes
PLA
STA $05
PLA
STA $0F
PLA
STA $03
PLA
STA $02
CLI
LDY #$06
LDX #$00
RTS
CommFunc:
;checksum verifcation
LDA payloadSize
TAX
DEX
DEX
LDA #$00
STA $07A3
:
LDA codeScratchArea,x
CLC
ADC $07A3
STA $07A3
DEX
BPL :-
LDX payloadSize
DEX
LDA codeScratchArea,x
CMP $07A3
BEQ :+
;LDA #$72
;STA FIFO_DATA
RTS
:
LDX #$00
;Read message ID
LDA codeScratchArea,x
STA $03
INX
;Read action
LDA codeScratchArea,x
STA $0F
INX
;system messages
CMP #$FF
BNE :+
JMP NullMsg
:
CMP #$FE
BNE :+
JMP Version
:
;All actions over 6 get sent to return
CMP #$06
BCC :+
LDA #$05
:
;;;;;;;;;;;
;LDA $03
;STA $0342
;ORA #$40
;STA $034A
;LDA #$80
;STA $0349
;RTS
;jump table for actions
ASL
TAY
LDA Actions,y
STA $0B
LDA Actions+1,y
STA $0C
JMP ($000B)
Actions:
#byte <Reads, >Reads, <ArrayReads, >ArrayReads
#byte <Writes, >Writes, <ArrayWrites, >ArrayWrites
#byte <Freeze, >Freeze, <CommReturn, >CommReturn
Reads:
;Read number of addresses
LDA codeScratchArea,x
STA $02
;send N8/USB header stuff
ldy #$00
.headerLoop:
lda sendItemStateChangeMsgHeader, y
STA FIFO_DATA
iny
cpy #4
bne .headerLoop
;send message length
LDA $02
CLC
ADC #$03
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;Our return header
LDA #$20 ;static part
STA FIFO_DATA
LDA $03 ;message ID
STA FIFO_DATA
LDA $0F ;action (0)
STA FIFO_DATA
LDY #$00
INX
;loop through addresses sent
:
LDA codeScratchArea,x
STA $0B
INX
LDA codeScratchArea,x
STA $0C
INX
;use indirect addressing to read value with 00 as a pointer
TYA
PHA
LDY #$00
LDA ($0B),Y
STA FIFO_DATA
PLA
TAY
;loop until reaching saved number of addresses
INY
CPY $02
BNE :-
CommReturn:
RTS
WriteByte:
STA FIFO_DATA
RTS
ArrayReads:
;Read array length
LDA codeScratchArea,x
STA $02
;send N8/USB header stuff
ldy #$00
.headerLoop:
lda sendItemStateChangeMsgHeader, y
STA FIFO_DATA
iny
cpy #4
bne .headerLoop
;send message length
LDA $02
CLC
ADC #$03
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;Our return header
LDA #$20 ;static part
STA FIFO_DATA
LDA $03 ;message ID
STA FIFO_DATA
LDA $0F ;action (1)
STA FIFO_DATA
INX
;store base address to pointer
LDA codeScratchArea,x
STA $0B
INX
LDA codeScratchArea,x
STA $0C
INX
;use indirect addressing to read value with 00 as a pointer
LDY #$00
:
LDA ($0B),Y
STA FIFO_DATA
;loop until reaching array length
INY
CPY $02
BNE :-
RTS
Writes:
;Read number of addresses
LDA codeScratchArea,x
STA $02
;send N8/USB header stuff
ldy #$00
.headerLoop:
lda sendItemStateChangeMsgHeader, y
STA FIFO_DATA
iny
cpy #4
bne .headerLoop
;send message length
LDA #$03
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;Our return header
LDA #$20 ;static part
STA FIFO_DATA
LDA $03 ;message ID
STA FIFO_DATA
LDA $0F ;action (2)
STA FIFO_DATA
LDY #$00
INX
;loop through addresses sent
:
;address
LDA codeScratchArea,x
STA $0B
INX
LDA codeScratchArea,x
STA $0C
INX
;value
LDA codeScratchArea,x
STA $05
INX
;use indirect addressing to read value with 00 as a pointer
TYA
PHA
LDY #$00
LDA $05
STA ($0B),Y
PLA
TAY
;loop until reaching saved number of addresses
INY
CPY $02
BNE :-
RTS
ArrayWrites:
;Read array length
LDA codeScratchArea,x
STA $02
;send N8/USB header stuff
ldy #$00
.headerLoop:
lda sendItemStateChangeMsgHeader, y
STA FIFO_DATA
iny
cpy #4
bne .headerLoop
;send message length
LDA #$03
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;Our return header
LDA #$20 ;static part
STA FIFO_DATA
LDA $03 ;message ID
STA FIFO_DATA
LDA $0F ;action (3)
STA FIFO_DATA
INX
;store base address to pointer
LDA codeScratchArea,x
STA $0B
INX
LDA codeScratchArea,x
STA $0C
INX
;use indirect addressing to read value with 00 as a pointer
LDY #$00
:
;values
LDA codeScratchArea,x
INX
STA ($0B),Y
;loop until reaching array length
INY
CPY $02
BNE :-
RTS
Version:
;send N8/USB header stuff
ldy #$00
.headerLoop:
lda sendItemStateChangeMsgHeader, y
STA FIFO_DATA
iny
cpy #4
bne .headerLoop
;send message length
LDA #$08
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;Our return header
LDA #$20 ;static part
STA FIFO_DATA
LDA $03 ;message ID
STA FIFO_DATA
LDA $0F ;action (FE)
STA FIFO_DATA
;version number
LDA #$00
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;max read size
LDA #$10
STA FIFO_DATA
;max write size
LDA #$10
STA FIFO_DATA
;max freezes
LDA #$05
STA FIFO_DATA
RTS
NullMsg:
;send N8/USB header stuff
ldy #$00
.headerLoop:
lda sendItemStateChangeMsgHeader, y
STA FIFO_DATA
iny
cpy #4
bne .headerLoop
;send message length
LDA #$03
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;Our return header
LDA #$20 ;static part
STA FIFO_DATA
LDA $03 ;message ID
STA FIFO_DATA
LDA $0F ;action (FF)
STA FIFO_DATA
RTS
Freeze:
;size
LDA codeScratchArea,x
STA FreezeScratch+4
INX
;compare size
LDA codeScratchArea,x
STA FreezeScratch+9
INX
;address
LDA codeScratchArea,x
STA $0B
STA FreezeScratch
INX
LDA codeScratchArea,x
STA $0C
STA FreezeScratch+1
INX
;value
LDA codeScratchArea,x
STA FreezeScratch+2
INX
;mask
LDA codeScratchArea,x
STA FreezeScratch+3
INX
;write mode
LDA codeScratchArea,x
STA FreezeScratch+5
INX
;compare address
LDA codeScratchArea,x
STA FreezeScratch+6
INX
LDA codeScratchArea,x
STA FreezeScratch+7
INX
;compare value
LDA codeScratchArea,x
STA FreezeScratch+8
INX
;compare type
LDA codeScratchArea,x
STA FreezeScratch+10
INX
JSR FindFreezeAddr
BCC .notfound
;address exists in table
LDA FreezeScratch+10
BNE :+
;Compare is never, erase freeze entry
LDA #$01
STA $05
LDA #$00
STA FreezeTable,x
BEQ .finish
:
;overwrite existing entry
JSR SaveFreeze
LDA #$01
STA $05
SEC
BCS .finish
.notfound:
JSR FindFreezeEmpty
BCS :+
;No empty slot
LDA #$00
STA $05
BEQ .finish
:
JSR SaveFreeze
LDA #$01
STA $05
.finish:
;send N8/USB header stuff
ldy #$00
.headerLoop:
lda sendItemStateChangeMsgHeader, y
STA FIFO_DATA
iny
cpy #4
bne .headerLoop
;send message length
LDA #$04
STA FIFO_DATA
LDA #$00
STA FIFO_DATA
;Our return header
LDA #$20 ;static part
STA FIFO_DATA
LDA $03 ;message ID
STA FIFO_DATA
LDA $0F ;action (04)
STA FIFO_DATA
LDA $05 ;success
STA FIFO_DATA
RTS
;Looks for Address matching $0B,$0C - sets X to that slot and sets carry if found, otherwise clear carry
FindFreezeAddr:
LDX #$00
:
LDA FreezeTable,x
CMP #$AB
BNE :+
LDA FreezeTable+1,x
CMP $0B
BNE :+
LDA FreezeTable+2,x
CMP $0C
BNE :+
SEC
RTS
:
TXA
CLC
ADC #$10
TAX
CMP #$80
BNE :--
CLC
RTS
;Looks for unused slot - sets X to that slot and sets carry if found, otherwise clear carry
FindFreezeEmpty:
LDX #$00
:
LDA FreezeTable,x
CMP #$AB
BEQ :+
SEC
RTS
:
TXA
CLC
ADC #$10
TAX
CMP #$80
BNE :--
CLC
RTS
;Copies the incoming values into the current freeze slot pointed to in X
SaveFreeze:
LDA #$AB
STA FreezeTable,x
INX
LDY #$00
:
LDA FreezeScratch,y
STA FreezeTable,x
INX
INY
CPY #$0B
BNE :-
RTS
;loops over freeze table, tests compares and then calls writes
ExecuteFreezes:
LDA FreezeInit
CMP #$AB
BEQ :+
LDA #$AB
STA FreezeInit
LDA #$00
STA FreezeTable
STA FreezeTable+$10
STA FreezeTable+$20
STA FreezeTable+$30
STA FreezeTable+$40
STA FreezeTable+$50
STA FreezeTable+$60
STA FreezeTable+$70
:
LDX #$00
:
LDA FreezeTable,x
CMP #$AB
BNE :+
JSR TestCompare
BCC :+
JSR FreezeWrite
:
TXA
CLC
ADC #$10
TAX
CMP #$80
BNE :--
CLC
RTS
;public enum CompareType : byte
;{
; Never = 0x00,
; Equal = 0x01,
; NotEqual = 0x02,//6,A,C,E
; Always = 0x03,//7,B,D,F
; GreaterThan = 0x04,
; GreaterThanOrEqual = 0x05,
; LessThan = 0x08,
; LessThanOrEqual = 0x09,
; NotLessThan = 0x05,
; NotGreaterThan = 0x09,
;
; MaskSet = 0x11,
; MaskUnset = 0x12,
;
;}
;performs the comparison check for the current freeze and sets carry if valid
TestCompare:
;Get current value
LDA FreezeTable+7,x
STA $0B
LDA FreezeTable+8,x
STA $0C
LDY #$00
LDA ($0B),y
STA $02
LDA FreezeTable+$B,x
CMP #$01
BNE :+
;Equal
LDA $02
CMP FreezeTable+9,x
BEQ Success
BNE .fail
:
CMP #$02
BNE :+
;NotEqual
LDA $02
CMP FreezeTable+9,x
BNE Success
BEQ .fail
:
CMP #$03
;Always
BEQ Success
CMP #$04
BNE :+
;GreaterThan
LDA $02
CMP FreezeTable+9,x
BEQ .fail
BCS Success
BCC .fail
:
CMP #$05
BNE :+
;GreaterThanOrEqual
LDA $02
CMP FreezeTable+9,x
BCC .fail
BCS Success
:
CMP #$08
BNE :+
;LessThan
LDA $02
CMP FreezeTable+9,x
BCS .fail
BCC Success
:
CMP #$09
BNE :+
;LessThanOrEqual
LDA $02
CMP FreezeTable+9,x
BEQ Success
BCS .fail
BCC Success
:
.fail:
CLC
RTS
Success:
SEC
RTS
;public enum WriteType : byte
;{
; None = 0,
; WriteValue = 1,
; IncrementBy = 2,
; DecrementBy = 3,
; WriteMasked = 4,
;}
FreezeWrite:
LDA FreezeTable+1,x
STA $0B
LDA FreezeTable+2,x
STA $0C
LDA FreezeTable+6,x
BNE :+
;None
RTS
:
CMP #$01
BNE :+
;WriteValue
LDY #$00
LDA FreezeTable+3,x
STA ($0B),y
RTS
:
CMP #$02
BNE :+
;IncrementBy
LDY #$00
LDA ($0B),y
CLC
ADC FreezeTable+3,x
STA ($0B),y
RTS
:
CMP #$03
BNE :+
;DecrementBy
LDY #$00
LDA ($0B),y
SEC
SBC FreezeTable+3,x
STA ($0B),y
RTS
:
CMP #$04
BNE :+
;WriteMasked
LDA FreezeTable+4,x
STA $03
AND FreezeTable+3,x
STA $02
LDA $03
EOR #$FF
STA $03
LDY #$00
LDA ($0B),y
AND $03
ORA $02
STA ($0B),y
:
RTS