20000317 sourceware import

libgloss/mn10300/crt0-eval.S

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+##==============================================================================
+##
+##	crt0-eval.S
+##
+##	MN10300 Series Evaluation Board C startup code
+##
+##==============================================================================
+######COPYRIGHTBEGIN####
+##
+## Copyright (c) 1995, 1996, 1997, 1998 Cygnus Solutions
+## 
+## 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.
+##
+######COPYRIGHTEND####
+	
+##------------------------------------------------------------------------------
+	
+	.file	"crt0-eval.S"
+
+##------------------------------------------------------------------------------
+## Startup code
+			
+	.equ	DRAM_TOP,0x48100000
+
+	.text
+
+	.globl	__start
+__start:
+	# Set up stack.  Leave 4K at top for use by Cygmon.
+
+	mov	DRAM_TOP - 0x1000,a0
+	sub	8,a0
+	mov	a0,sp
+
+	# Clear BSS
+
+	mov	__bss_start,a0
+	mov	_end,a1
+
+	cmp	a0,a1
+	beq	8f
+	clr	d0
+1:	
+	movbu	d0,(a0)
+	inc	a0
+	cmp	a0,a1
+	bne	1b	
+8:	
+	# Call constructors
+
+	.extern	___main
+	call	___main,[],0
+
+	# Call main
+	clr	d0
+	clr	d1
+	mov	d0,(4,sp)
+
+9:	
+ 	or	0x0800,psw	# Enable interrupts
+	
+	.extern	_main
+	call	_main,[],0
+
+	.extern	__exit
+	call	__exit,[],0
+
+#	bra	9b		# Loop if we return
+
+	
+			
+##------------------------------------------------------------------------------		
+## end of crt0-eval.S
+