.export     _init, _exit
    .import     _main

    .export     __STARTUP__ : absolute = 1  ; Mark as startup
    .import     __RAM_START__, __RAM_SIZE__ ; Linker generated
    ; FIXME: We should probe in _init to determine the actual ram size,
    ;   instead of assuming a full 64k...

    .import     copydata, zerobss, initlib, donelib

    .include "zeropage.inc"
.bss

; -----------------------------------------------------------------------------
; Place the startup code in a special segment.

.segment    "STARTUP"

; -----------------------------------------------------------------------------
; A little light 6502 housekeeping.
; FIXME: The boot loader probably already handles this. Do we still need to
;   do this?

_init:      LDX #$FF        ; Initialize stack pointer to $01FF.
            TXS
            CLD         ; Clear decimal mode.

; -----------------------------------------------------------------------------
; Set cc65 argument stack pointer.

            LDA #<(__RAM_START__ + __RAM_SIZE__)
            STA sp
            LDA #>(__RAM_START__ + __RAM_SIZE__)
            STA sp+1

; -----------------------------------------------------------------------------
; Initialize memory storage.

            JSR zerobss     ; Clear BSS segment.
            JSR copydata    ; Initialize DATA segment.
            JSR initlib     ; Run constructors.

; -----------------------------------------------------------------------------
; Call main().

            JSR _main

; -----------------------------------------------------------------------------
; Cleanup and exit.

_exit:      JSR donelib     ; Run destructors
exitloop:   WAI
            JMP exitloop