Commented basic init and anti piracy routines
This commit is contained in:
p4plus2
parent
77b39ac86c
commit
357f0fcc92
1 changed files with 146 additions and 147 deletions
293
bank_80.asm
293
bank_80.asm
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@ -120,13 +120,13 @@ DATA_808000:
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db $00, $00, $69, $00, $00, $00, $69, $00
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db $00, $00, $69, $00, $00, $00, $69, $00
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DATA_8083C0:
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rare_string:
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db "Rareware"
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DATA_8083C8:
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piracy_string:
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db "A thief!"
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CODE_8083D0:
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display_error_message:
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TYA ;$8083D0 \
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JSL CODE_BB80B0 ;$8083D1 |
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LDA #DATA_FD258E ;$8083D5 |
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@ -142,149 +142,149 @@ CODE_8083D0:
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STP ;$8083F6 /
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RESET_start:
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SEI ;$8083F7 \
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LDA #$80 ;$8083F8 |
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STA $2100 ;$8083FA |
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LDA #$01 ;$8083FD |
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STA $4200 ;$8083FF |
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STA $420D ;$808402 |
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DEC A ;$808405 |
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STA $420C ;$808406 |
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CLC ;$808409 |
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XCE ;$80840A |
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REP #$30 ;$80840B |
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TDC ;$80840D |
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ADC #$FFFF ;$80840E |
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BEQ CODE_808416 ;$808411 |
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BRL CODE_8084C1 ;$808413 /
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SEI ;$8083F7 \ Disable interrupts
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LDA #$80 ;$8083F8 |\ Enable F-Blank
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STA $2100 ;$8083FA |/
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LDA #$01 ;$8083FD |\ Enable autojoy and fastROM
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STA $4200 ;$8083FF | |
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STA $420D ;$808402 |/
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DEC A ;$808405 |\ Disable HDMA
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STA $420C ;$808406 |/
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CLC ;$808409 |\ Disable emulation mode
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XCE ;$80840A |/
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REP #$30 ;$80840B |\ Anti piracy: Ensure dp is zero
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TDC ;$80840D | | and the emulation flag was set
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ADC #$FFFF ;$80840E | |
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BEQ .anti_piracy_test ;$808411 |/
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BRL .prepare_anti_piracy ;$808413 / Anti piracy triggered
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CODE_808416:
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TSX ;$808416 \
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LDA #$83F6 ;$808417 |
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CMP $FFFF,x ;$80841A |
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BEQ CODE_80848B ;$80841D |
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LDY #$1FFD ;$80841F |
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SEP #$20 ;$808422 |
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CODE_808424: ; |
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LDA $0000,y ;$808424 |
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CMP #$4C ;$808427 |
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BEQ CODE_808459 ;$808429 |
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CMP #$6C ;$80842B |
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BEQ CODE_808467 ;$80842D |
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CMP #$60 ;$80842F |
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BEQ CODE_80847F ;$808431 |
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CODE_808433: ; |
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DEY ;$808433 |
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BPL CODE_808424 ;$808434 |
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REP #$20 ;$808436 |
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LDA.l $B06000 ;$808438 |
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INC A ;$80843C |
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STA $B06000 ;$80843D |
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CMP $B06000 ;$808441 |
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BNE CODE_8084C1 ;$808445 |
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DEC A ;$808447 |
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STA $B06000 ;$808448 |
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LDY #$003D ;$80844C |
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LDA $213F ;$80844F |
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AND #$0010 ;$808452 |
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BNE CODE_8084C4 ;$808455 |
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BRA CODE_8084D4 ;$808457 /
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.anti_piracy_test ; \
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TSX ;$808416 |\ Check if the reset vector was
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LDA #RESET_start-1 ;$808417 | | the most recent popped value
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CMP $FFFF,x ;$80841A | |
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BEQ .check_for_false_positive ;$80841D |/
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LDY #$1FFD ;$80841F | Load number of RAM bytes to scan
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SEP #$20 ;$808422 | Use 8 bit to check each byte
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.next_byte ; |
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LDA $0000,y ;$808424 | Load byte to scan
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CMP #$4C ;$808427 |\ Test for JMP $83F7 (reset vector)
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BEQ .jmp_test ;$808429 |/
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CMP #$6C ;$80842B |\ Test for JMP ($xxxx) (indirect reset vector)
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BEQ .indirect_jmp_test ;$80842D |/
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CMP #$60 ;$80842F |\ Test for #$60-#$7F being sequential
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BEQ .sequential_test ;$808431 |/
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.resume_scanning ; |
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DEY ;$808433 |\ If not at the end of RAM continue scanning
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BPL .next_byte ;$808434 |/
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REP #$20 ;$808436 |\ Test that SRAM is present
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LDA.l $B06000 ;$808438 | |
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INC A ;$80843C | |
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STA $B06000 ;$80843D | |
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CMP $B06000 ;$808441 | |
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BNE .prepare_anti_piracy ;$808445 |/ Otherwise trigger anti piracy
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DEC A ;$808447 |\ Restore byte modified from SRAM test
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STA $B06000 ;$808448 |/
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LDY #$003D ;$80844C | Load wrong console message
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LDA $213F ;$80844F |\ Verify the console is NTSC
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AND #$0010 ;$808452 | |
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BNE .prepare_message ;$808455 |/ Display wrong console message
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BRA .final_piracy_test ;$808457 / Do the final piracy test
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CODE_808459:
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.jmp_test
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REP #$20 ;$808459 \
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LDA $0001,y ;$80845B |
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CMP #$83F7 ;$80845E |
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BEQ CODE_80848B ;$808461 |
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LDA $0001,y ;$80845B |\ Check if the operand was the reset vector
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CMP #RESET_start ;$80845E | |
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BEQ .check_for_false_positive ;$808461 |/
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SEP #$20 ;$808463 |
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BRA CODE_808433 ;$808465 /
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BRA .resume_scanning ;$808465 / Continue scanning
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CODE_808467:
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.indirect_jmp_test
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REP #$20 ;$808467 \
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LDX $0001,y ;$808469 |
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BMI CODE_808473 ;$80846C |
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CPX #$2000 ;$80846E |
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BPL CODE_80847B ;$808471 |
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CODE_808473: ; |
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LDA $0000,x ;$808473 |
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CMP #$83F7 ;$808476 |
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BEQ CODE_80848B ;$808479 |
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CODE_80847B: ; |
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LDX $0001,y ;$808469 |\ Test if operand was ROM
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BMI .address_rom ;$80846C |/
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CPX #$2000 ;$80846E |\ Test if the operand was low RAM
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BPL .invalid_address ;$808471 |/ Otherwise skip the indirect test
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.address_rom ; |
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LDA $0000,x ;$808473 |\ Check if the operand pointed to the reset vector
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CMP #RESET_start ;$808476 | |
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BEQ .check_for_false_positive ;$808479 |/
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.invalid_address ; |
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SEP #$20 ;$80847B |
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BRA CODE_808433 ;$80847D /
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BRA .resume_scanning ;$80847D / Continue scanning
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CODE_80847F:
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TYX ;$80847F \
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CODE_808480: ; |
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CMP $0000,x ;$808480 |
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BNE CODE_808433 ;$808483 |
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INX ;$808485 |
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INC A ;$808486 |
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BPL CODE_808480 ;$808487 |
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REP #$20 ;$808489 |
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CODE_80848B: ; |
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PHK ;$80848B |
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PLB ;$80848C |
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LDX #$0006 ;$80848D |
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CODE_808490: ; |
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LDA $0907,x ;$808490 |
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CMP DATA_8083C0,x ;$808493 |
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BNE CODE_80849E ;$808496 |
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DEX ;$808498 |
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DEX ;$808499 |
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BPL CODE_808490 ;$80849A |
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BRA CODE_8084E7 ;$80849C /
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.sequential_test
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TYX ;$80847F \ X is used so to preserve Y if the test fails
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.next_count ; |
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CMP $0000,x ;$808480 |\ Scan for the sequential string of $60-$7F
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BNE .resume_scanning ;$808483 | |
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INX ;$808485 | |
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INC A ;$808486 | |
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BPL .next_count ;$808487 |/
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REP #$20 ;$808489 | Fall through to final check
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.check_for_false_positive ; |
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PHK ;$80848B |\ Set current databank
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PLB ;$80848C |/
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LDX #$0006 ;$80848D | Load anti piracy test string length
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- ; |
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LDA $0907,x ;$808490 |\ Avoid false positive by checking if
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CMP rare_string,x ;$808493 | | the anti piracy check was prior passed
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BNE .write_piracy_string ;$808496 | | Otherwise jump and fail anti piracy check
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DEX ;$808498 | |
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DEX ;$808499 | |
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BPL - ;$80849A |/
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BRA .prepare_logo ;$80849C / Boot the game
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CODE_80849E:
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LDX #$0006 ;$80849E \
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LDY #$0004 ;$8084A1 |
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CODE_8084A4: ; |
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LDA DATA_8083C8,x ;$8084A4 |
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STA $0907,x ;$8084A7 |
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CMP.l $B06000,x ;$8084AA |
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BNE CODE_8084B1 ;$8084AE |
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DEY ;$8084B0 |
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CODE_8084B1: ; |
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STA $B06000,x ;$8084B1 |
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DEX ;$8084B5 |
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DEX ;$8084B6 |
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BPL CODE_8084A4 ;$8084B7 |
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TYA ;$8084B9 |
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BEQ CODE_8084C1 ;$8084BA |
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LDY #$003B ;$8084BC |
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BRA CODE_8084C4 ;$8084BF /
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.write_piracy_string
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LDX #$0006 ;$80849E \ Load anti piracy string length
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LDY #$0004 ;$8084A1 | Load target iteration count
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.write_next_byte ; |
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LDA piracy_string,x ;$8084A4 |\ Load the current anti piracy byte
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STA $0907,x ;$8084A7 | | Write the anti piracy byte in RAM
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CMP.l $B06000,x ;$8084AA | |\ If the byte is already in SRAM decrease the
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BNE + ;$8084AE | | | iteration count. If zero, the full string
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DEY ;$8084B0 | |/ was already present.
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+ ; | |
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STA $B06000,x ;$8084B1 | | Write the anti piracy byte to SRAM
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DEX ;$8084B5 | |\ Move anti piracy index
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DEX ;$8084B6 | |/
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BPL .write_next_byte ;$8084B7 |/ Continue writing until there are no more bytes
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TYA ;$8084B9 |\ If the anti piracy failure string was already in SRAM
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BEQ .prepare_anti_piracy ;$8084BA |/ Display the anti piracy message
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LDY #$003B ;$8084BC | Otherwise load irregularity detected message
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BRA .prepare_message ;$8084BF / Display the message
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.prepare_anti_piracy
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LDY #$003C ;$8084C1 \ Load anti piracy message
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.prepare_message ; |
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LDA #$0000 ;$8084C4 |\ Zero the direct page register
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TCD ;$8084C7 |/
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LDX #$01FF ;$8084C8 |\ Reset the stack register
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TXS ;$8084CB |/
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%return(display_error_message) ;$8084CC | Push address to decompress and display the message
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%return(clear_vram) ;$8084CF | Push address for clearing vram
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BRA initialize_registers ;$8084D2 / Initialize MMIO registers
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CODE_8084C1:
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LDY #$003C ;$8084C1 \
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CODE_8084C4: ; |
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LDA #$0000 ;$8084C4 |
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TCD ;$8084C7 |
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LDX #$01FF ;$8084C8 |
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TXS ;$8084CB |
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%return(CODE_8083D0) ;$8084CC |
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%return(CODE_808591) ;$8084CF |
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BRA CODE_8084F8 ;$8084D2 /
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.final_piracy_test ; \
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PHK ;$8084D4 |\ Set current databank
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PLB ;$8084D5 |/
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LDX #$0006 ;$8084D6 | Load anti piracy string length
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- ; |
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LDA $0907,x ;$8084D9 |\ Verify the anti piracy failure string is not in RAM
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CMP piracy_string,x ;$8084DC | |
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BNE .prepare_logo ;$8084DF | |
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DEX ;$8084E1 | |
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DEX ;$8084E2 | |
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BPL - ;$8084E3 |/
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BRA .prepare_anti_piracy ;$8084E5 / If the string was matched, display anti piracy message
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CODE_8084D4:
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PHK ;$8084D4 \
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PLB ;$8084D5 |
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LDX #$0006 ;$8084D6 |
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CODE_8084D9: ; |
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LDA $0907,x ;$8084D9 |
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CMP DATA_8083C8,x ;$8084DC |
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BNE CODE_8084E7 ;$8084DF |
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DEX ;$8084E1 |
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DEX ;$8084E2 |
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BPL CODE_8084D9 ;$8084E3 |
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BRA CODE_8084C1 ;$8084E5 /
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CODE_8084E7:
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LDA #$0000 ;$8084E7 \
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STA $B06000 ;$8084EA |
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LDX #$01FF ;$8084EE |
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TXS ;$8084F1 |
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%return(CODE_8085B9) ;$8084F2 |
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%return(CODE_808591) ;$8084F5 |
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CODE_8084F8: ; |
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.prepare_logo ; \
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LDA #$0000 ;$8084E7 |\ Clear first word of SRAM
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STA $B06000 ;$8084EA |/
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LDX #$01FF ;$8084EE |\ Reset the stack register
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TXS ;$8084F1 |/
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%return(CODE_8085B9) ;$8084F2 | Push address to run Rareware logo
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%return(clear_vram) ;$8084F5 | Push address for clearing VRAM
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initialize_registers: ; |
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SEP #$30 ;$8084F8 |
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LDX #$00 ;$8084FA |
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CODE_8084FC: ; |
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@ -348,14 +348,13 @@ CODE_80856D: ; |
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RTS ;$80858A /
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CODE_80858B:
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JSR CODE_8084F8 ;$80858B \
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JSR initialize_registers ;$80858B \
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RTL ;$80858E /
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DATA_80858F:
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db $00, $00
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CODE_808591:
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clear_vram:
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STZ $2116 ;$808591 \
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LDA #DATA_80858F ;$808594 |
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STA $4302 ;$808597 |
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@ -372,7 +371,7 @@ CODE_808591:
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RTS ;$8085B4 /
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CODE_8085B5:
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JSR CODE_808591 ;$8085B5 \
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JSR clear_vram ;$8085B5 \
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RTL ;$8085B8 /
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CODE_8085B9:
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@ -389,7 +388,7 @@ CODE_8085B9:
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PLB ;$8085D2 |
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LDX #$0006 ;$8085D3 |
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CODE_8085D6: ; |
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LDA DATA_8083C0,x ;$8085D6 |
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LDA rare_string,x ;$8085D6 |
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STA $0907,x ;$8085D9 |
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DEX ;$8085DC |
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DEX ;$8085DD |
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@ -1735,8 +1734,8 @@ CODE_8090DA:
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JSR CODE_8090CD ;$8090DA \
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LDA #$002C ;$8090DD |
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STA $78 ;$8090E0 |
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JSR CODE_8084F8 ;$8090E2 |
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JSR CODE_808591 ;$8090E5 |
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JSR initialize_registers ;$8090E2 |
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JSR clear_vram ;$8090E5 |
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STZ $2A ;$8090E8 |
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LDA #$AA55 ;$8090EA |
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STA $2E ;$8090ED |
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@ -2498,7 +2497,7 @@ CODE_8097CD:
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JSL CODE_BB91D9 ;$8097CD \
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PHK ;$8097D1 |
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PLB ;$8097D2 |
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JSR CODE_808591 ;$8097D3 |
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JSR clear_vram ;$8097D3 |
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JSL CODE_80858B ;$8097D6 |
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JSL CODE_808E6A ;$8097DA |
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JSL CODE_8088AB ;$8097DE |
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@ -3243,7 +3242,7 @@ CODE_809F85:
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JSL CODE_BB91D9 ;$809F85 \
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PHK ;$809F89 |
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PLB ;$809F8A |
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JSR CODE_808591 ;$809F8B |
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JSR clear_vram ;$809F8B |
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JSL CODE_80858B ;$809F8E |
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JSL CODE_808E6A ;$809F92 |
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JSL CODE_BB91F7 ;$809F96 |
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@ -3918,7 +3917,7 @@ CODE_80A5F1:
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JSL CODE_BB91D9 ;$80A5F1 \
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PHK ;$80A5F5 |
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PLB ;$80A5F6 |
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JSR CODE_808591 ;$80A5F7 |
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JSR clear_vram ;$80A5F7 |
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JSL CODE_80858B ;$80A5FA |
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JSL CODE_808E6A ;$80A5FE |
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JSL CODE_8088AB ;$80A602 |
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@ -5444,7 +5443,7 @@ CODE_80B3D7:
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PLB ;$80B3DC |
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STZ $099B ;$80B3DD |
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STZ $060B ;$80B3E0 |
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JSR CODE_808591 ;$80B3E3 |
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JSR clear_vram ;$80B3E3 |
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JSL CODE_80858B ;$80B3E6 |
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JSL CODE_8088D2 ;$80B3EA |
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JSL CODE_BB91F7 ;$80B3EE |
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@ -5667,7 +5666,7 @@ CODE_80B560:
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CODE_80B5FA:
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JSL CODE_BB91D9 ;$80B5FA \
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JSL CODE_808591 ;$80B5FE |
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JSL clear_vram ;$80B5FE |
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JSL CODE_80858B ;$80B602 |
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JSL CODE_BB91F7 ;$80B606 |
|
||||
LDA #$0001 ;$80B60A |
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue