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/common/zerobss.s
+++ b/libsrc/common/zerobss.s
@@ -0,0 +1,47 @@
+;
+; Ullrich von Bassewitz, 17.09.1998
+;
+; Zero the bss segment.
+;
+
+	.export		zerobss
+	.import		__BSS_RUN__, __BSS_SIZE__
+	.importzp	ptr1
+
+
+.code
+
+zerobss:
+	lda	#<__BSS_RUN__
+	sta	ptr1
+	lda	#>__BSS_RUN__
+	sta	ptr1+1
+	lda	#0
+	tay
+
+; Clear full pages
+
+L1:	ldx	#>__BSS_SIZE__
+	beq	L3
+L2:	sta	(ptr1),y
+   	iny
+   	bne	L2
+	inc	ptr1+1
+	dex
+	bne	L2
+
+; Clear remaining page (y is zero on entry)
+
+L3:	ldx	#<__BSS_SIZE__
+   	beq	L5
+L4:	sta	(ptr1),y
+   	iny
+   	dex
+   	bne	L4
+
+; Done
+
+L5:	rts
+
+
+