cc65/libsrc/atmos/crt0.s

;
; Startup code for cc65 (Oric version)
;
; By Debrune J<>r<EFBFBD>me <jede@oric.org> and Ullrich von Bassewitz <uz@cc65.org>
;
; This must be the *first* file on the linker command line
;

	.export		_exit
	.import		initlib, donelib
	.import	     	push0, _main, zerobss
	.import		__RAM_START__, __RAM_SIZE__	; Linker generated

        .importzp       sp

; ------------------------------------------------------------------------
; Create an empty LOWCODE segment to avoid linker warnings

.segment        "LOWCODE"

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

.segment       	"STARTUP"

; Clear the BSS data

	jsr	zerobss

; Save system stuff and setup the stack

       	tsx
       	stx    	spsave       	; save system stk ptr

	lda    	#<(__RAM_START__ + __RAM_SIZE__)
	sta	sp
	lda	#>(__RAM_START__ + __RAM_SIZE__)
       	sta	sp+1   		; Set argument stack ptr

; Call module constructors

	jsr	initlib

; Pass an empty command line

       	jsr    	push0		; argc
	jsr	push0		; argv

	ldy	#4    		; Argument size
       	jsr    	_main 		; call the users code

; Call module destructors. This is also the _exit entry.

_exit:	jsr	donelib		; Run module destructors

; Restore system stuff

	ldx	spsave
	txs

; Back to BASIC

	rts

; ------------------------------------------------------------------------
; Data

.bss
spsave:	.res	1