This commit was generated by cvs2svn to compensate for changes in r2,

which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-05-28 13:40:48 +00:00
parent 579491e8a4
commit 53dd513176
847 changed files with 91345 additions and 0 deletions
--- a/libsrc/plus4/crt0.s
+++ b/libsrc/plus4/crt0.s
@@ -0,0 +1,129 @@
+;
+; Startup code for cc65 (Plus/4 version)
+;
+; This must be the *first* file on the linker command line
+;
+
+	.export		_exit
+	.import	     	__hinit, push0, doatexit, _main
+	.import		initconio, doneconio, zerobss
+
+	.include	"plus4.inc"
+	.include	"../cbm/cbm.inc"
+
+; ------------------------------------------------------------------------
+; Define and export the ZP variables for the C64 runtime
+
+	.exportzp	sp, sreg, regsave
+	.exportzp	ptr1, ptr2, ptr3, ptr4
+	.exportzp	tmp1, tmp2, tmp3, tmp4
+	.exportzp	regbank, zpspace
+
+sp     	=      	$02  	      	; stack pointer
+sreg	=  	$04  	      	; secondary register/high 16 bit for longs
+regsave	=      	$06  	      	; slot to save/restore (E)AX into
+ptr1	=	$0A  	      	;
+ptr2	=	$0C
+ptr3	=	$0E
+ptr4	=	$10
+tmp1	=	$12
+tmp2	=	$13
+tmp3	=	$14
+tmp4	=	$15
+regbank	=	$16		; 6 byte register bank
+zpspace	=	$1A    		; Zero page space allocated
+
+; ------------------------------------------------------------------------
+; BASIC header with a SYS call
+
+	.org	$0FFF
+        .word   Head            ; Load address
+Head:   .word   @Next
+        .word   1000            ; Line number
+        .byte   $9E,"4109"	; SYS 4109
+        .byte   $00             ; End of BASIC line
+@Next:  .word   0               ; BASIC end marker
+	.reloc
+
+; ------------------------------------------------------------------------
+; Actual code
+
+	ldy	#zpspace-1
+L1:	lda	sp,y
+   	sta	zpsave,y	; save the zero page locations we need
+	dey
+       	bpl	L1
+
+; Close open files
+
+	jsr	CLRCH
+
+; Switch to second charset
+
+	lda	#14
+	jsr	BSOUT
+
+; Clear the BSS data
+
+	jsr	zerobss
+
+; Save system stuff and setup the stack
+
+       	tsx
+       	stx    	spsave       	; save system stk ptr
+
+	sec
+	jsr	MEMTOP		; Get top memory
+	cpy	#$80  		; We can only use the low 32K :-(
+	bcc	MemOk
+	ldy	#$80
+	ldx	#$00
+MemOk:	stx	sp
+      	sty	sp+1  		; set argument stack ptr
+
+; Initialize the heap
+
+	jsr	__hinit
+
+; Initialize conio stuff
+
+	jsr	initconio
+
+; Pass an empty command line
+
+       	jsr    	push0		; argc
+	jsr	push0		; argv
+
+	ldy	#4    		; Argument size
+       	jsr    	_main 		; call the users code
+
+; fall thru to exit...
+
+_exit:	jsr	doatexit	; call exit functions
+	ldx	spsave
+	txs
+
+; Reset the conio stuff
+
+	jsr	doneconio
+
+; Copy back the zero page stuff
+
+	ldy	#zpspace-1
+L2:	lda	zpsave,y
+	sta	sp,y
+	dey
+       	bpl	L2
+
+; Reset changed vectors
+
+	jmp	RESTOR
+
+
+.data
+zpsave:	.res	zpspace
+
+.bss
+spsave:	.res	1
+
+