20000317 sourceware import

libgloss/d30v/crt0.S

@@ -0,0 +1,56 @@
+/*
+ * crt0.S -- startup file for D30V systems.
+ *
+ * Copyright (c) 1997 Cygnus Support
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+	.file	"crt0.S"
+	.text
+	.globl	_start
+	.extern	main
+	.extern	exit
+	.extern __stack
+	.extern	__sbss_start
+	.extern	__sbss_end
+	.extern	__ebss_start
+	.extern	__ebss_end
+	.extern	__bss_start
+	.extern	__bss_end
+	.extern	memset
+	.type	_start,@function
+
+_start:	or.l	sp,r0,__stack
+
+	/* Zero the .sbss area */
+	or.l	r2,r0,__sbss_start
+	or.l	r4,r0,__sbss_end
+	sub	r4,r4,r2	|| or.s r3,r0,0
+	bsrtnz.l r4,(memset)
+
+	/* Zero the .ebss area */
+	or.l	r2,r0,__ebss_start
+	or.l	r4,r0,__ebss_end
+	sub	r4,r4,r2	|| or.s r3,r0,0
+	bsrtnz.l r4,(memset)
+
+	/* Zero the .bss area */
+	or.l	r2,r0,__bss_start
+	or.l	r4,r0,__bss_end
+	sub	r4,r4,r2	|| or.s r3,r0,0
+	bsrtnz.l r4,(memset)
+
+	or.s	r2,r0,0		|| or.s	r3,r0,0
+	or	r4,r0,0		|| nop
+	jsr.l	(main)
+	jsr.l	(exit)
+	.size	_start,.-_start