Use the new LOWCODE segment

git-svn-id: svn://svn.cc65.org/cc65/trunk@1589 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/c128/break.s

@@ -8,7 +8,6 @@
        	.export	    	_set_brk, _reset_brk
 	.destructor	_reset_brk
   	.export	    	_brk_a, _brk_x, _brk_y, _brk_sr, _brk_pc
-	.import		BRKStub, BRKOld, BRKInd
 	.importzp	ptr1
 
   	.include    	"c128.inc"
@@ -33,24 +32,24 @@ uservec:    	jmp 	$FFFF	 	; Patched at runtime
 	sta	uservec+1
   	stx	uservec+2     	; Set the user vector
 
-	lda	BRKOld+1
+	lda	brk_old+1
-	ora	BRKOld+2      	; Did we save the vector already?
+	ora	brk_old+2      	; Did we save the vector already?
        	bne    	@L1    	      	; Jump if we installed the handler already
 
 	lda	BRKVec		; Save the old vector
- 	sta    	BRKOld+1
+ 	sta    	brk_old+1
  	lda 	BRKVec+1
- 	sta	BRKOld+2
+ 	sta	brk_old+2
 
-   	lda    	#<BRKStub	; Set the break vector to our stub
+   	lda    	#<brk_stub      ; Set the break vector to our stub
-    	ldx	#>BRKStub
+    	ldx	#>brk_stub
     	sta	BRKVec
     	stx    	BRKVec+1
 
 	lda	#<brk_handler	; Set the indirect vector to our handler
 	ldx	#>brk_handler
-	sta	BRKInd+1
+	sta	brk_ind+1
-	stx	BRKInd+2
+	stx	brk_ind+2
 
 @L1:   	rts
 
@@ -60,14 +59,14 @@ uservec:    	jmp 	$FFFF	 	; Patched at runtime
 ; Reset the break vector
 .proc	_reset_brk
 
-    	lda  	BRKOld+1
+    	lda  	brk_old+1
-    	ldx  	BRKOld+2
+    	ldx  	brk_old+2
     	beq  	@L9    		; Jump if vector not installed
     	sta    	BRKVec
     	stx  	BRKVec+1
 	lda	#$00
-	sta	BRKOld+1	; Clear the saved vector
+	sta	brk_old+1	; Clear the saved vector
-	sta	BRKOld+2
+	sta	brk_old+2
 @L9:	rts
 
 .endproc
@@ -111,3 +110,26 @@ uservec:    	jmp 	$FFFF	 	; Patched at runtime
 .endproc
 
 
+; Break stub, must go into low (non banked) memory
+
+.segment        "LOWCODE"
+
+.proc   brk_stub
+	pla    	       			; Get original MMU_CR value
+	sta    	MMU_CR 			; And set it
+       	jmp    	brk_ind                 ; Jump indirect to break
+.endproc
+
+; ------------------------------------------------------------------------
+; Data
+
+.data
+
+; Old break vector preceeded by a jump opcode
+brk_old:
+        jmp     $0000
+
+; Indirect vectors preceeded by a jump opcode
+brk_ind:
+        jmp     $0000
+

libsrc/c128/crt0.s

@@ -5,7 +5,6 @@
 ;
 
     	.export	     	_exit
-    	.export	     	BRKStub, BRKOld, BRKInd
     	.import	     	condes, initlib, donelib
     	.import	     	initconio, doneconio, zerobss
     	.import		push0, _main
@@ -189,24 +188,12 @@ IRQStub:
        	jmp    	IRQInd			; Jump to the saved IRQ vector
 
 
-BRKStub:
-	pla    				; Get original MMU_CR value
-	sta    	MMU_CR			; And set it
-       	jmp    	BRKInd 	       	       	; Jump indirect to break
-
-
 ; ------------------------------------------------------------------------
 ; Data
 
 .data
 zpsave:	.res	zpspace
 
-; Old break vector preceeded by a jump opcode
-BRKOld: jmp     $0000
-
-; Indirect vectors preceeded by a jump opcode
-BRKInd: jmp     $0000
-
 .bss
 spsave:	.res	1
 mmusave:.res	1