Lynx boot stuff split up into several files. Changes by Karri Kaksonen.
git-svn-id: svn://svn.cc65.org/cc65/trunk@4979 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz
194
libsrc/lynx/bootldr.s
Normal file
194
libsrc/lynx/bootldr.s
Normal file
@@ -0,0 +1,194 @@
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;
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; Karri Kaksonen, 2011
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;
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; This bootloader creates a signed binary so that the Lynx will accept it.
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;
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.include "lynx.inc"
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.include "extzp.inc"
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.import __BLOCKSIZE__
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.export __BOOTLDR__: absolute = 1
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; ------------------------------------------------------------------------
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; Bootloader
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.segment "BOOTLDR"
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;**********************************
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; Here is the bootloader in plaintext
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; The idea is to make the smalles possible encrypted loader as decryption
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; is very slow. The minimum size is 49 bytes plus a zero byte.
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;**********************************
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; EXE = $f000
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;
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; .org $0200
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;
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; ; 1. force Mikey to be in memory
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; stz MAPCTL
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;
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; ; 3. set ComLynx to open collector
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; lda #4 ; a = 00000100
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; sta SERCTL ; set the ComLynx to open collector
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;
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; ; 4. make sure the ROM is powered on
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; lda #8 ; a = 00001000
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; sta IODAT ; set the ROM power to on
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;
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; ; 5. read in secondary exe + 8 bytes from the cart and store it in $f000
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; ldx #0 ; x = 0
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; ldy #$AB ; y = secondary loader size (171 bytes)
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;rloop1: lda RCART0 ; read a byte from the cart
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; sta EXE,X ; EXE[X] = a
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; inx ; x++
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; dey ; y--
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; bne rloop1 ; loops until y wraps
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;
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; ; 6. jump to secondary loader
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; jmp EXE ; run the secondary loader
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;
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; .reloc
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;**********************************
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; After compilation, encryption and obfuscation it turns into this.
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;**********************************
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.byte $ff, $dc, $e3, $bd, $bc, $7f, $f8, $94
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.byte $b7, $dd, $68, $bb, $da, $5b, $50, $5c
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.byte $ea, $9f, $2b, $df, $96, $80, $3f, $7e
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.byte $ef, $15, $81, $ae, $ad, $e4, $6e, $b3
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.byte $46, $d7, $72, $58, $f7, $76, $8a, $4a
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.byte $c7, $99, $bd, $ff, $02, $3e, $5b, $3f
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.byte $0c, $49, $1b, $22
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;**********************************
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; Now we have the secondary loader
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;**********************************
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.org $f000
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; 1. Read in the 1st File-entry (main exe) in FileEntry
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ldx #$00
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ldy #8
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rloop: lda RCART0 ; read a byte from the cart
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sta _FileEntry,X ; EXE[X] = a
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inx
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dey
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bne rloop
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; 2. Set the block hardware to the main exe start
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lda _FileStartBlock
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sta _FileCurrBlock
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jsr seclynxblock
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; 3. Skip over the block offset
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lda _FileBlockOffset
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ldx _FileBlockOffset+1
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phx ; The BLL kit uses negative offsets
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plx ; while the basic Lynx uses positive
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bmi @1 ; Make all offsets negative
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eor #$FF
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pha
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txa
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eor #$FF
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bra @2
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@1: pha
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txa
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@2: tay
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plx
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jsr seclynxskip0
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; 4. Read in the main exe to RAM
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lda _FileDestAddr
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ldx _FileDestAddr+1
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sta _FileDestPtr
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stx _FileDestPtr+1
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lda _FileFileLen
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ldx _FileFileLen+1
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phx ; The BLL kit uses negative counts
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plx ; while the basic Lynx uses positive
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bmi @3 ; make all counts negative
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eor #$FF
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pha
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txa
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eor #$FF
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bra @4
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@3: pha
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txa
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@4: tay
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plx
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jsr seclynxread0
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; 5. Jump to start of the main exe code
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jmp (_FileDestAddr)
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;**********************************
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; Skip bytes on bank 0
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; X:Y count (EOR $FFFF)
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;**********************************
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seclynxskip0:
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inx
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bne @0
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iny
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beq exit
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@0: jsr secreadbyte0
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bra seclynxskip0
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;**********************************
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; Read bytes from bank 0
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; X:Y count (EOR $ffff)
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;**********************************
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seclynxread0:
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inx
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bne @1
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iny
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beq exit
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@1: jsr secreadbyte0
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sta (_FileDestPtr)
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inc _FileDestPtr
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bne seclynxread0
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inc _FileDestPtr+1
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bra seclynxread0
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;**********************************
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; Read one byte from cartridge
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;**********************************
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secreadbyte0:
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lda RCART0
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inc _FileBlockByte
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bne exit
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inc _FileBlockByte+1
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bne exit
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;**********************************
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; Select a block
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;**********************************
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seclynxblock:
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pha
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phx
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phy
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lda __iodat
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and #$fc
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tay
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ora #2
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tax
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lda _FileCurrBlock
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inc _FileCurrBlock
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sec
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bra @2
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@0: bcc @1
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stx IODAT
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clc
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@1: inx
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stx SYSCTL1
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dex
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@2: stx SYSCTL1
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rol
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sty IODAT
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bne @0
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lda __iodat
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sta IODAT
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stz _FileBlockByte
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lda #<($100-(>__BLOCKSIZE__))
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sta _FileBlockByte+1
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ply
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plx
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pla
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exit: rts
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.reloc
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31
libsrc/lynx/defdir.s
Normal file
31
libsrc/lynx/defdir.s
Normal file
@@ -0,0 +1,31 @@
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;
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; Karri Kaksonen, 2011
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;
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; A default directory with just the main executable.
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;
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.include "lynx.inc"
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.import __STARTOFDIRECTORY__
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.import __RAM_START__
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.import __CODE_SIZE__,__DATA_SIZE__,__RODATA_SIZE__
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.import __STARTUP_SIZE__,__INIT_SIZE__
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.import __BLOCKSIZE__
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.export __DEFDIR__: absolute = 1
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; ------------------------------------------------------------------------
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; Lynx directory
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.segment "DIRECTORY"
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__DIRECTORY_START__:
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off0=__STARTOFDIRECTORY__+(__DIRECTORY_END__-__DIRECTORY_START__)
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blocka=off0/__BLOCKSIZE__
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; Entry 0 - first executable
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block0=off0/__BLOCKSIZE__
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len0=__STARTUP_SIZE__+__INIT_SIZE__+__CODE_SIZE__+__DATA_SIZE__+__RODATA_SIZE__
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.byte <block0
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.word off0 & (__BLOCKSIZE__ - 1)
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.byte $88
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.word __RAM_START__
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.word len0
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__DIRECTORY_END__:
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@@ -1,13 +1,8 @@
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;
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;
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; Karri Kaksonen, 2011
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; Karri Kaksonen, 2011
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;
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;
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; This header is required for cart builds.
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; This header contains data for emulators like Handy and Mednafen
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;
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;
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.include "lynx.inc"
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.include "extzp.inc"
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.import __RAM_START__
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.import __CODE_SIZE__,__DATA_SIZE__,__RODATA_SIZE__
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.import __STARTUP_SIZE__,__INIT_SIZE__
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.import __BLOCKSIZE__
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.import __BLOCKSIZE__
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.export __EXEHDR__: absolute = 1
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.export __EXEHDR__: absolute = 1
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@@ -25,198 +20,3 @@
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; rotation 2=right
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; rotation 2=right
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.byte 0,0,0,0,0 ; spare
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.byte 0,0,0,0,0 ; spare
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;**********************************
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|
||||||
; Here is the bootloader in plaintext
|
|
||||||
; The idea is to make the smalles possible encrypted loader as decryption
|
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||||||
; is very slow. The minimum size is 49 bytes plus a zero byte.
|
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;**********************************
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; EXE = $f000
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;
|
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; .org $0200
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;
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; ; 1. force Mikey to be in memory
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; stz MAPCTL
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;
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; ; 3. set ComLynx to open collector
|
|
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; lda #4 ; a = 00000100
|
|
||||||
; sta SERCTL ; set the ComLynx to open collector
|
|
||||||
;
|
|
||||||
; ; 4. make sure the ROM is powered on
|
|
||||||
; lda #8 ; a = 00001000
|
|
||||||
; sta IODAT ; set the ROM power to on
|
|
||||||
;
|
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||||||
; ; 5. read in secondary exe + 8 bytes from the cart and store it in $f000
|
|
||||||
; ldx #0 ; x = 0
|
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; ldy #$AB ; y = secondary loader
|
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;rloop1: lda RCART0 ; read a byte from the cart
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; sta EXE,X ; EXE[X] = a
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; inx ; x++
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; dey ; y--
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; bne rloop1 ; loops until y wraps
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;
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; ; 6. jump to secondary loader
|
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; jmp EXE ; run the secondary loader
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;
|
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; .reloc
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||||||
;**********************************
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|
||||||
; After compilation, encryption and obfuscation it turns into this.
|
|
||||||
;**********************************
|
|
||||||
__LOADER_SIZE__=52
|
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||||||
.byte $ff, $dc, $e3, $bd, $bc, $7f, $f8, $94
|
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||||||
.byte $b7, $dd, $68, $bb, $da, $5b, $50, $5c
|
|
||||||
.byte $ea, $9f, $2b, $df, $96, $80, $3f, $7e
|
|
||||||
.byte $ef, $15, $81, $ae, $ad, $e4, $6e, $b3
|
|
||||||
.byte $46, $d7, $72, $58, $f7, $76, $8a, $4a
|
|
||||||
.byte $c7, $99, $bd, $ff, $02, $3e, $5b, $3f
|
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||||||
.byte $0c, $49, $1b, $22
|
|
||||||
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|
||||||
;**********************************
|
|
||||||
; Now we have the secondary loader
|
|
||||||
;**********************************
|
|
||||||
__LOADER2_SIZE__=171
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|
||||||
.org $f000
|
|
||||||
; 1. Read in the 1st File-entry (main exe) in FileEntry
|
|
||||||
ldx #$00
|
|
||||||
ldy #8
|
|
||||||
rloop: lda RCART0 ; read a byte from the cart
|
|
||||||
sta _FileEntry,X ; EXE[X] = a
|
|
||||||
inx
|
|
||||||
dey
|
|
||||||
bne rloop
|
|
||||||
|
|
||||||
; 2. Set the block hardware to the main exe start
|
|
||||||
lda _FileStartBlock
|
|
||||||
sta _FileCurrBlock
|
|
||||||
jsr seclynxblock
|
|
||||||
|
|
||||||
; 3. Skip over the block offset
|
|
||||||
lda _FileBlockOffset
|
|
||||||
ldx _FileBlockOffset+1
|
|
||||||
phx ; The BLL kit uses negative offsets
|
|
||||||
plx ; while the basic Lynx uses positive
|
|
||||||
bmi @1 ; Make all offsets negative
|
|
||||||
eor #$FF
|
|
||||||
pha
|
|
||||||
txa
|
|
||||||
eor #$FF
|
|
||||||
bra @2
|
|
||||||
@1: pha
|
|
||||||
txa
|
|
||||||
@2: tay
|
|
||||||
plx
|
|
||||||
jsr seclynxskip0
|
|
||||||
|
|
||||||
; 4. Read in the main exe to RAM
|
|
||||||
lda _FileDestAddr
|
|
||||||
ldx _FileDestAddr+1
|
|
||||||
sta _FileDestPtr
|
|
||||||
stx _FileDestPtr+1
|
|
||||||
lda _FileFileLen
|
|
||||||
ldx _FileFileLen+1
|
|
||||||
phx ; The BLL kit uses negative counts
|
|
||||||
plx ; while the basic Lynx uses positive
|
|
||||||
bmi @3 ; make all counts negative
|
|
||||||
eor #$FF
|
|
||||||
pha
|
|
||||||
txa
|
|
||||||
eor #$FF
|
|
||||||
bra @4
|
|
||||||
@3: pha
|
|
||||||
txa
|
|
||||||
@4: tay
|
|
||||||
plx
|
|
||||||
jsr seclynxread0
|
|
||||||
|
|
||||||
; 5. Jump to start of the main exe code
|
|
||||||
jmp (_FileDestAddr)
|
|
||||||
|
|
||||||
;**********************************
|
|
||||||
; Skip bytes on bank 0
|
|
||||||
; X:Y count (EOR $FFFF)
|
|
||||||
;**********************************
|
|
||||||
seclynxskip0:
|
|
||||||
inx
|
|
||||||
bne @0
|
|
||||||
iny
|
|
||||||
beq exit
|
|
||||||
@0: jsr secreadbyte0
|
|
||||||
bra seclynxskip0
|
|
||||||
|
|
||||||
;**********************************
|
|
||||||
; Read bytes from bank 0
|
|
||||||
; X:Y count (EOR $ffff)
|
|
||||||
;**********************************
|
|
||||||
seclynxread0:
|
|
||||||
inx
|
|
||||||
bne @1
|
|
||||||
iny
|
|
||||||
beq exit
|
|
||||||
@1: jsr secreadbyte0
|
|
||||||
sta (_FileDestPtr)
|
|
||||||
inc _FileDestPtr
|
|
||||||
bne seclynxread0
|
|
||||||
inc _FileDestPtr+1
|
|
||||||
bra seclynxread0
|
|
||||||
|
|
||||||
;**********************************
|
|
||||||
; Read one byte from cartridge
|
|
||||||
;**********************************
|
|
||||||
secreadbyte0:
|
|
||||||
lda RCART0
|
|
||||||
inc _FileBlockByte
|
|
||||||
bne exit
|
|
||||||
inc _FileBlockByte+1
|
|
||||||
bne exit
|
|
||||||
|
|
||||||
;**********************************
|
|
||||||
; Select a block
|
|
||||||
;**********************************
|
|
||||||
seclynxblock:
|
|
||||||
pha
|
|
||||||
phx
|
|
||||||
phy
|
|
||||||
lda __iodat
|
|
||||||
and #$fc
|
|
||||||
tay
|
|
||||||
ora #2
|
|
||||||
tax
|
|
||||||
lda _FileCurrBlock
|
|
||||||
inc _FileCurrBlock
|
|
||||||
sec
|
|
||||||
bra @2
|
|
||||||
@0: bcc @1
|
|
||||||
stx IODAT
|
|
||||||
clc
|
|
||||||
@1: inx
|
|
||||||
stx SYSCTL1
|
|
||||||
dex
|
|
||||||
@2: stx SYSCTL1
|
|
||||||
rol
|
|
||||||
sty IODAT
|
|
||||||
bne @0
|
|
||||||
lda __iodat
|
|
||||||
sta IODAT
|
|
||||||
stz _FileBlockByte
|
|
||||||
lda #<($100-(>__BLOCKSIZE__))
|
|
||||||
sta _FileBlockByte+1
|
|
||||||
ply
|
|
||||||
plx
|
|
||||||
pla
|
|
||||||
|
|
||||||
exit: rts
|
|
||||||
.reloc
|
|
||||||
|
|
||||||
__DIRECTORY_START__:
|
|
||||||
; Entry 0 - title sprite (mandatory)
|
|
||||||
off0=__LOADER_SIZE__+__LOADER2_SIZE__+(__DIRECTORY_END__-__DIRECTORY_START__)
|
|
||||||
blocka=off0/__BLOCKSIZE__
|
|
||||||
; Entry 0 - first executable
|
|
||||||
block0=off0/__BLOCKSIZE__
|
|
||||||
len0=__STARTUP_SIZE__+__INIT_SIZE__+__CODE_SIZE__+__DATA_SIZE__+__RODATA_SIZE__
|
|
||||||
.byte <block0
|
|
||||||
.word off0 & (__BLOCKSIZE__ - 1)
|
|
||||||
.byte $88
|
|
||||||
.word __RAM_START__
|
|
||||||
.word len0
|
|
||||||
__DIRECTORY_END__:
|
|
||||||
|
|
||||||
|
|||||||
@@ -32,15 +32,11 @@
|
|||||||
;----------------------------------------------------------------------------
|
;----------------------------------------------------------------------------
|
||||||
; Global variables
|
; Global variables
|
||||||
;
|
;
|
||||||
; The ring buffers will be at the fixed place
|
|
||||||
; Tx buffer $200 - $2ff. Rx buffer $300 - $3ff.
|
|
||||||
; This memory area can usually not be used for anything as the encryption
|
|
||||||
; stuff needs it. But for this purpose it fits perfectly.
|
|
||||||
|
|
||||||
.bss
|
.bss
|
||||||
|
|
||||||
TxBuffer = $0200
|
TxBuffer: .res 256
|
||||||
RxBuffer = $0300
|
RxBuffer: .res 256
|
||||||
RxPtrIn: .res 1
|
RxPtrIn: .res 1
|
||||||
RxPtrOut: .res 1
|
RxPtrOut: .res 1
|
||||||
TxPtrIn: .res 1
|
TxPtrIn: .res 1
|
||||||
|
|||||||
@@ -3,14 +3,20 @@ SYMBOLS {
|
|||||||
__STARTOFDIRECTORY__: type = weak, value = $00DF; # start just after loader
|
__STARTOFDIRECTORY__: type = weak, value = $00DF; # start just after loader
|
||||||
__BLOCKSIZE__: type = weak, value = 1024; # cart block size
|
__BLOCKSIZE__: type = weak, value = 1024; # cart block size
|
||||||
__EXEHDR__: type = import;
|
__EXEHDR__: type = import;
|
||||||
|
__BOOTLDR__: type = import;
|
||||||
|
__DEFDIR__: type = import;
|
||||||
}
|
}
|
||||||
MEMORY {
|
MEMORY {
|
||||||
ZP: file = "", define = yes, start = $0000, size = $0100;
|
ZP: file = "", define = yes, start = $0000, size = $0100;
|
||||||
HEADER: file = %O, start = $0000, size = $021e;
|
HEADER: file = %O, start = $0000, size = $0040;
|
||||||
RAM: file = %O, define = yes, start = $0400, size = $9C58 - __STACKSIZE__;
|
BOOT: file = %O, start = $0200, size = __STARTOFDIRECTORY__;
|
||||||
|
DIR: file = %O, start = $0000, size = 8;
|
||||||
|
RAM: file = %O, define = yes, start = $0200, size = $9E58 - __STACKSIZE__;
|
||||||
}
|
}
|
||||||
SEGMENTS {
|
SEGMENTS {
|
||||||
EXEHDR: load = HEADER, type = ro;
|
EXEHDR: load = HEADER, type = ro;
|
||||||
|
BOOTLDR: load = BOOT, type = ro;
|
||||||
|
DIRECTORY:load = DIR, type = ro;
|
||||||
STARTUP: load = RAM, type = ro, define = yes;
|
STARTUP: load = RAM, type = ro, define = yes;
|
||||||
LOWCODE: load = RAM, type = ro, optional = yes;
|
LOWCODE: load = RAM, type = ro, optional = yes;
|
||||||
INIT: load = RAM, type = ro, define = yes, optional = yes;
|
INIT: load = RAM, type = ro, define = yes, optional = yes;
|
||||||
|
|||||||
@@ -3,14 +3,20 @@ SYMBOLS {
|
|||||||
__STARTOFDIRECTORY__: type = weak, value = $00DF; # start just after loader
|
__STARTOFDIRECTORY__: type = weak, value = $00DF; # start just after loader
|
||||||
__BLOCKSIZE__: type = weak, value = 1024; # cart block size
|
__BLOCKSIZE__: type = weak, value = 1024; # cart block size
|
||||||
__EXEHDR__: type = import;
|
__EXEHDR__: type = import;
|
||||||
|
__BOOTLDR__: type = import;
|
||||||
|
__DEFDIR__: type = import;
|
||||||
}
|
}
|
||||||
MEMORY {
|
MEMORY {
|
||||||
ZP: file = "", define = yes, start = $0000, size = $0100;
|
ZP: file = "", define = yes, start = $0000, size = $0100;
|
||||||
HEADER: file = %O, start = $0000, size = $021e;
|
HEADER: file = %O, start = $0000, size = $0040;
|
||||||
RAM: file = %O, define = yes, start = $0400, size = $BC38 - __STACKSIZE__;
|
BOOT: file = %O, start = $0200, size = __STARTOFDIRECTORY__;
|
||||||
|
DIR: file = %O, start = $0000, size = 8;
|
||||||
|
RAM: file = %O, define = yes, start = $0200, size = $BE38 - __STACKSIZE__;
|
||||||
}
|
}
|
||||||
SEGMENTS {
|
SEGMENTS {
|
||||||
EXEHDR: load = HEADER, type = ro;
|
EXEHDR: load = HEADER, type = ro;
|
||||||
|
BOOTLDR: load = BOOT, type = ro;
|
||||||
|
DIRECTORY:load = DIR, type = ro;
|
||||||
STARTUP: load = RAM, type = ro, define = yes;
|
STARTUP: load = RAM, type = ro, define = yes;
|
||||||
LOWCODE: load = RAM, type = ro, optional = yes;
|
LOWCODE: load = RAM, type = ro, optional = yes;
|
||||||
INIT: load = RAM, type = ro, define = yes, optional = yes;
|
INIT: load = RAM, type = ro, define = yes, optional = yes;
|
||||||
|
|||||||
Reference in New Issue
Block a user