New target supervision

git-svn-id: svn://svn.cc65.org/cc65/trunk@2497 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/supervision/crt0.s

@@ -0,0 +1,81 @@
+;
+; Startup code for cc65 (supervision version)
+;
+; This must be the *first* file on the linker command line
+;
+
+        .export         _exit
+
+	.import	        _main
+        .import         initlib, donelib, copydata
+        .import         zerobss
+	.import		__RAM_START__, __RAM_SIZE__	; Linker generated
+
+	.include "zeropage.inc"
+	.include "supervision.inc"
+
+	.export	_sv_irq_timer_counter, _sv_irq_dma_counter
+	.export	_sv_nmi_counter
+
+.bss
+
+_sv_irq_dma_counter:    .byte 0
+_sv_irq_timer_counter:  .byte 0
+_sv_nmi_counter:        .byte 0
+
+.code
+
+reset:
+	jsr	zerobss
+
+	; initialize data
+	jsr	copydata
+
+	lda	#>(__RAM_START__ + __RAM_SIZE__)
+       	sta	sp+1   		; Set argument stack ptr
+       	stz	sp              ; #<(__RAM_START__ + __RAM_SIZE__)
+	jsr	initlib
+	jsr	_main
+_exit:	jsr     donelib
+exit:   jmp    	exit
+
+
+.proc   irq
+	pha
+	lda	sv_irq_source
+	and	#SV_IRQ_REQUEST_TIMER
+	beq	not_timer
+	lda	sv_timer_quit
+	inc	_sv_irq_timer_counter
+not_timer:
+	lda	sv_irq_source
+	and	#SV_IRQ_REQUEST_DMA
+	beq	not_dma
+	lda	sv_dma_quit
+	inc	_sv_irq_dma_counter
+not_dma:
+	pla
+	rti
+.endproc
+
+.proc   nmi
+	inc	_sv_nmi_counter
+	rti
+.endproc
+
+; removing this segment gives only a warning
+        .segment "FFF0"
+.proc reset32kcode
+        lda     #(6<<5)
+        sta     sv_bank
+; now the 32kbyte image can reside in the top of 64kbyte, 128kbyte roms
+        jmp     reset
+.endproc
+
+        .segment "VECTOR"
+
+.word   nmi
+.word   reset32kcode
+.word   irq
+
+