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cc65/libsrc/lynx/crt0.s
uz 8216bf1d6a Force an import of the special symbol __STARTUP__ in the C compiler when
main() is encountered. Define this symbol in the startup code. This will
automatically force linking of the startup code which can then reside inside
the standard library as any other object file.


git-svn-id: svn://svn.cc65.org/cc65/trunk@3988 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-07-31 12:05:42 +00:00

152 lines
3.0 KiB
ArmAsm

; ***
; CC65 Lynx Library
;
; Originally by Bastian Schick
; http://www.geocities.com/SiliconValley/Byte/4242/lynx/
;
; Ported to cc65 (http://www.cc65.org) by
; Shawn Jefferson, June 2004
;
; ***
;
; Startup code for cc65 (Lynx version). Based on Atari 8-bit startup
; code structure. The C stack is located at the end of the RAM memory
; segment and grows downward. Bastian Schick's executable header is put
; on the front of the fully linked binary (see EXEHDR segment.)
;
.include "lynx.inc"
.export _exit
.export __STARTUP__ : absolute = 1 ; Mark as startup
.import initlib, donelib
.import zerobss
.import callmain
.import _main
.import __BSS_LOAD__
.import __RAM_START__, __RAM_SIZE__
.include "zeropage.inc"
.include "extzp.inc"
; ------------------------------------------------------------------------
; EXE header (BLL header)
.segment "EXEHDR"
.word $0880
.dbyt __RAM_START__
.dbyt __BSS_LOAD__ - __RAM_START__ + 10
.byte $42,$53
.byte $39,$33
; ------------------------------------------------------------------------
; Mikey and Suzy init data, reg offsets and data
.rodata
SuzyInitReg: .byte $28,$2a,$04,$06,$92,$83,$90
SuzyInitData: .byte $7f,$7f,$00,$00,$24,$f3,$01
MikeyInitReg: .byte $00,$01,$08,$09,$20,$28,$30,$38,$44,$50,$8a,$8b,$8c,$92,$93
MikeyInitData: .byte $9e,$18,$68,$1f,$00,$00,$00,$00,$00,$ff,$1a,$1b,$04,$0d,$29
; ------------------------------------------------------------------------
; Actual code
.segment "STARTUP"
; set up system
sei
cld
ldx #$FF
txs
; init bank switching
lda #$C
sta MAPCTL ; $FFF9
; disable all timer interrupts
lda #$80
trb TIM0CTLA
trb TIM1CTLA
trb TIM2CTLA
trb TIM3CTLA
trb TIM5CTLA
trb TIM6CTLA
trb TIM7CTLA
; disable TX/RX IRQ, set to 8E1
lda #%11101
sta SERCTL
; clear all pending interrupts
lda INTSET
sta INTRST
; setup the stack
lda #<(__RAM_START__ + __RAM_SIZE__)
sta sp
lda #>(__RAM_START__ + __RAM_SIZE__)
sta sp+1
; Init Mickey
ldx #.sizeof(MikeyInitReg)-1
mloop: ldy MikeyInitReg,x
lda MikeyInitData,x
sta $fd00,y
dex
bpl mloop
; these are RAM-shadows of read only regs
ldx #$1b
stx __iodat
dex ; $1A
stx __iodir
ldx #$d
stx __viddma
; Init Suzy
ldx #.sizeof(SuzyInitReg)-1
sloop: ldy SuzyInitReg,x
lda SuzyInitData,x
sta $fc00,y
dex
bpl sloop
lda #$24
sta __sprsys
; Clear the BSS data
jsr zerobss
; Call module constructors
jsr initlib
; Push arguments and call main
jsr callmain
; Call module destructors. This is also the _exit entry.
_exit: jsr donelib ; Run module destructors
; Endless loop
noret: bra noret