mirror of
https://github.com/cc65/cc65.git
synced 2025-02-04 13:32:54 +00:00
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:
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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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; Karri Kaksonen, 2011
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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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.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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.export __EXEHDR__: absolute = 1
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@ -25,198 +20,3 @@
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; rotation 2=right
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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
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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
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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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__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
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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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__LOADER2_SIZE__=171
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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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__DIRECTORY_START__:
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; Entry 0 - title sprite (mandatory)
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off0=__LOADER_SIZE__+__LOADER2_SIZE__+(__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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@ -32,15 +32,11 @@
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;----------------------------------------------------------------------------
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; Global variables
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;
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; The ring buffers will be at the fixed place
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; Tx buffer $200 - $2ff. Rx buffer $300 - $3ff.
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; This memory area can usually not be used for anything as the encryption
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; stuff needs it. But for this purpose it fits perfectly.
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.bss
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TxBuffer = $0200
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RxBuffer = $0300
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TxBuffer: .res 256
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RxBuffer: .res 256
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RxPtrIn: .res 1
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RxPtrOut: .res 1
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TxPtrIn: .res 1
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@ -3,14 +3,20 @@ SYMBOLS {
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__STARTOFDIRECTORY__: type = weak, value = $00DF; # start just after loader
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__BLOCKSIZE__: type = weak, value = 1024; # cart block size
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__EXEHDR__: type = import;
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__BOOTLDR__: type = import;
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__DEFDIR__: type = import;
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}
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MEMORY {
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ZP: file = "", define = yes, start = $0000, size = $0100;
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HEADER: file = %O, start = $0000, size = $021e;
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RAM: file = %O, define = yes, start = $0400, size = $9C58 - __STACKSIZE__;
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HEADER: file = %O, start = $0000, size = $0040;
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BOOT: file = %O, start = $0200, size = __STARTOFDIRECTORY__;
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DIR: file = %O, start = $0000, size = 8;
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RAM: file = %O, define = yes, start = $0200, size = $9E58 - __STACKSIZE__;
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}
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SEGMENTS {
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EXEHDR: load = HEADER, type = ro;
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BOOTLDR: load = BOOT, type = ro;
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DIRECTORY:load = DIR, type = ro;
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STARTUP: load = RAM, type = ro, define = yes;
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LOWCODE: load = RAM, type = ro, optional = yes;
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INIT: load = RAM, type = ro, define = yes, optional = yes;
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@ -3,14 +3,20 @@ SYMBOLS {
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__STARTOFDIRECTORY__: type = weak, value = $00DF; # start just after loader
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__BLOCKSIZE__: type = weak, value = 1024; # cart block size
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__EXEHDR__: type = import;
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__BOOTLDR__: type = import;
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__DEFDIR__: type = import;
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}
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MEMORY {
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ZP: file = "", define = yes, start = $0000, size = $0100;
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HEADER: file = %O, start = $0000, size = $021e;
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RAM: file = %O, define = yes, start = $0400, size = $BC38 - __STACKSIZE__;
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HEADER: file = %O, start = $0000, size = $0040;
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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 {
|
||||
EXEHDR: load = HEADER, type = ro;
|
||||
BOOTLDR: load = BOOT, type = ro;
|
||||
DIRECTORY:load = DIR, type = ro;
|
||||
STARTUP: load = RAM, type = ro, define = yes;
|
||||
LOWCODE: load = RAM, type = ro, optional = yes;
|
||||
INIT: load = RAM, type = ro, define = yes, optional = yes;
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user