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failure.asm
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pushtable
table "bsodencode.txt"
; Uncomment this to force a crash to test message
;pushpc : org $008132 : db 0 : pullpc
;===================================================================================================
DontUseZSNES:
SEP #$35 ; sets carry and I flag too
LDA.b #$00
STA.l $4200 ; disable NMI and IRQ
STA.l $420C ; disable HDMA
ROR ; A = 0x80 from carry
STA.l $2100
STA.l $2115
; Empty VRAM
LDA.b #AllZeros>>16 : STA.l $4304
REP #$20
LDA.w #AllZeros
STA.l $4302
LDA.w #$1809
STA.l $4300
LDA.w #$0000
STA.l $4305
LDA.w #$0001
STA.l $420B
JSR ConfigurePPUForFailureReport
JSR ConfigureBSODVWF
STZ.b VWFR
LDA.w #ZSNESMessage
JSR DrawVWFMessage
LDA.w #$0F0F
STA.w $2100
-- BRA --
ZSNESMessage:
db "It has been detected that you are attempting to load", $80
db "this ROM on a low-quality emulator.", $80
db "The randomizer is designed to work on real hardware,", $80
db "which this application cannot emulate properly;", $80
db "as such, this ROM file refuses to boot.", $80
db "Please upgrade to a more accurate emulator such as", $80
db "SNES9X or BSNES/higan.", $80
db $FF
;===================================================================================================
AllZeros:
db $00
UselessStackTooFar:
dw $137
Crashed:
;===================================================================================================
;===================================================================================================
;===================================================================================================
; !!!DO NOT TRY TO OPTIMIZE THIS CODE!!!
; IT IS INTENTIONALLY AVOIDING CHANGING CERTAIN REGISTERS, ESPECIALLY THE STACK.
;===================================================================================================
;===================================================================================================
;===================================================================================================
SEP #$35 ; sets carry and I flag too
LDA.b #$00
STA.l $4200 ; disable NMI and IRQ
STA.l $420C ; disable HDMA
ROR ; A = 0x80 from carry
STA.l $2100
STA.l $2115
; Empty VRAM
LDA.b #AllZeros>>16 : STA.l $4304
REP #$38
LDA.w #AllZeros
STA.l $4302
LDA.w #$1809
STA.l $4300
LDA.w #$0000
STA.l $4305
LDA.w #$0001
STA.l $420B
;===================================================================================================
; Create report
LDA.w #$2100
TCD
;---------------------------------------------------------------------------------------------------
; Report status
; stack pointer
LDA.w #$0C38>>1
STA.b $2116
TSC
XBA
AND.w #$00FF
ORA.w #$0100
STA.b $2118
TSC
AND.w #$00FF
ORA.w #$0100
STA.l $2118
; game module
LDA.w #$0C78>>1
STA.b $2116
LDA.l $10
AND.w #$00FF
ORA.w #$0100
STA.b $2118
LDA.l $11
AND.w #$00FF
ORA.w #$0100
STA.b $2118
;---------------------------------------------------------------------------------------------------
; Report stack
TSC
INC
STA.l $7F0100
LDA.l UselessStackTooFar
; For now, we can report as much of the stack as possible
; If desired later on, uncomment the code below to keep the stack limited to
; where it was last doing stuff
; TSC
;
; ; keep stack in a useful range
; CMP.w #$01FF ; this means we pulled too much and the stack is useless
; BCC .stack_fine
;
; JMP .skip_stack
;
;.stack_fine
; CMP.l UselessStackTooFar
; BCS .stack_adjusted
;
; ; this means we went too far in, and the stack contains little useful info
; LDA.l UselessStackTooFar
;
;.stack_adjusted
STA.l $7F0000
LDX.w #$01FF
LDA.w #$0C04>>1
.next_row
STA.l $7F0004
STA.b $2116
LDY.w #20
TXA
.next_char
; set carry to see if we should color this value as being in the stack
CMP.l $7F0100
LDA.l $000000,X
AND.w #$00FF
ORA.w #$0500
BCS .in_stack
AND.w #$01FF
.in_stack
STA.b $2118
DEX
TXA
CMP.l $7F0000
BEQ .skip_stack
DEY
BNE .next_char
.done_row
CLC
LDA.l $7F0004
ADC.w #32
BRA .next_row
;===================================================================================================
;===================================================================================================
;===================================================================================================
; once the stack is reported, we can start doing stuff that mucks with it
.skip_stack
LDA.w #$0000
TCD
; TSC
; STA.b $80 ; remember stack for later messages
LDA.w #$01FF
TCS
JSR ConfigurePPUForFailureReport
JSR ConfigureBSODVWF
JSR LoadBSODHexFont
STZ.b VWFR
LDA.w #BSODMessage
JSR DrawVWFMessage
LDA.w #$0F0F
STA.w $2100
-- BRA --
; LDA.w #$0000
; TCD
;
; TSC
BSODMessage:
db "A fatal error has occurred and resulted in an", $80
db "unrecoverable crash. ?", $80
db "If you believe this was the result of a bug caused by", $80
db "the randomizer itself, please screenshot this message", $80
db "and share it in the #bug-reports channel of the official", $80
db "ALTTPR discord along with a detailed description of", $80
db "what you were doing, including video if available.", $80
db "Please also make a savestate now and include that in", $80
db "your report.", $80
db $FF
;===================================================================================================
DrawVWFMessage:
STA.b $06
.next
LDA.b ($06)
INC.b $06
AND.w #$00FF
CMP.w #$0080
BEQ .done_row
CMP.w #$00FF
BEQ .done_message
JSR DrawFailureVWFChar
BRA .next
.done_message
RTS
.done_row
LDA.b VWFR
ASL
TAX
LDA.w .row_offset,X
STA.w $2116
INC.b VWFR
LDA.w #$1800
STA.w $4300
LDA.w #20*16
STA.w $4305
LDA.w #$1000
STA.w $4302
SEP #$20
STZ.w $2115
STZ.w $4304
LDA.b #$01
STA.w $420B
REP #$20
JSR ResetVFW
BRA .next
.row_offset
dw $10F8
dw $11E8
dw $12D8
dw $13C8
dw $14B8
dw $15A8
dw $1698
dw $1788
dw $1878
dw $1968
dw $1A58
;===================================================================================================
VWFL = $40
VWFX = $44
VWFS = $46
VWFP = $48
VWFR = $4A
;===================================================================================================
DrawFailureVWFChar:
AND.w #$00FF
STA.b VWFL
TAX
ASL
ASL
ASL
ADC.w #BSODFontGFX
STA.b $08
LDA.b VWFP
AND.w #$FFF8
STA.w VWFX
LDA.b VWFP
AND.w #$0007
STA.w VWFS
; carry set on purpose to add letter spacing
SEC
LDA.w BSODCharWidths,X
AND.w #$00FF
ADC.b VWFP
STA.b VWFP
LDY.w #$0000
.next_row
LDA.b ($08),Y
AND.w #$00FF
XBA
LDX.w VWFS
BEQ ++
-- LSR
DEX
BNE --
++ LDX.w VWFX
SEP #$20
ORA.w $1008,X
STA.w $1008,X
XBA
ORA.w $1000,X
STA.w $1000,X
REP #$20
INX
STX.w VWFX
INY
CPY.w #$0008
BCC .next_row
RTS
;===================================================================================================
LoadBSODHexFont:
REP #$20
LDA.w #BSODHex
STA.w $4302
LDA.w #$1801
STA.w $4300
LDA.w #$1000
STA.w $4305
LDA.w #$2800
STA.w $2116
SEP #$20
LDA.b #BSODHex>>16
STA.w $4304
LDA.b #$01
STA.w $420B
REP #$30
RTS
;===================================================================================================
ConfigureBSODVWF:
REP #$30
LDA.w #$2100
TCD
SEP #$30
LDX.b #$FF
LDY.b #$7F
STZ.b $2121
STZ.b $2122 : STZ.b $2122
STX.b $2122 : STY.b $2122
LDA.b #$05
STA.b $2121
LDA.b #$11 : STA.b $2122 : STY.b $2122
LDA.b #$21 : STA.b $2121
STX.b $2122 : STY.b $2122
LDA.b #$25 : STA.b $2121
LDA.b #$11 : STA.b $2122 : STY.b $2122
REP #$30
PEA.w $0001
LDA.w #15
STA.w $28
LDA.w #$0042>>1
BRA .start
.next_row
PHA
LDA.w $20
CLC
LDA.w $20
ADC.w #32
.start
STA.w $20
STA.b $2116
PLA
LDY.w #30
.next_char
STA.b $2118
INC
DEY
BNE .next_char
DEC.w $28
BNE .next_row
LDA.w #$0000
TCD
ResetVFW:
REP #$30
LDX.w #$0400
-- STZ.w $1000,X
DEX
DEX
BPL --
STZ.b VWFL
STZ.b VWFX
STZ.b VWFS
STZ.b VWFP
RTS
;===================================================================================================
ConfigurePPUForFailureReport:
SEP #$30
PHK
PLB
STZ.w $2105 ; BG mode 0
STZ.w $2106 ; no mosaic
STZ.w $2107 ; BG1 tilemap to $0000
STZ.w $212D
STZ.w $210D : STZ.w $210D
STZ.w $210E : STZ.w $210E
STZ.w $210F : STZ.w $210F
STZ.w $2110 : STZ.w $2110
STZ.w $2123
STZ.w $2131
STZ.w $2133
LDA.b #$04
STA.w $2108 ; BG1 tilemap to $0800
LDA.b #$21
STA.w $210B
LDA.b #$03
STA.w $212C
RTS
;===================================================================================================
BSODHex:
incbin "bsodhex.2bpp"
BSODFontGFX:
incbin "bsodfont.1bpp"
BSODCharWidths:
; [space]
db 3
; A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
db 4, 4, 3, 4, 3, 3, 4, 3, 1, 4, 3, 3, 5, 4, 4, 4, 5, 4, 4, 3, 4, 5, 5, 3, 3, 3
; 0 1 2 3 4 5 6 7 8 9 . # ? - / , '
db 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 5, 8, 3, 3, 2, 1
;===================================================================================================
pulltable