20000317 sourceware import

libgloss/mn10300/crt0.S

@@ -0,0 +1,58 @@
+##==============================================================================
+##
+##	crt0.S
+##
+##	MN10300 startup code
+##
+##==============================================================================
+##
+## 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.
+##
+	
+##------------------------------------------------------------------------------
+	
+	.file	"crt0.S"
+
+##------------------------------------------------------------------------------
+## Startup code
+	.section .text
+	.global	_start
+_start:
+	mov _stack-8,a0		# Load up the stack pointer
+	mov a0,sp
+
+	mov _edata,a0		# Get the start/end of bss
+	mov _end,a1
+
+	cmp a0,a1		# If no bss, then do nothing
+	beq .L0
+
+	clr d0			# clear d0
+
+.L1:
+	movbu d0,(a0)		# Clear a byte and bump pointer
+	inc a0
+	cmp a0,a1
+	bne .L1
+
+.L0:
+	call ___main,[],0	# Call __main to run ctors/dtors
+	clr d0
+	clr d1
+	mov d0,(4,sp)
+	call _main,[],0		# Call main program
+	call _exit,[],0		# All done, no need to return or
+				# deallocate our stack.
+
+	.section .stack
+_stack:	.long 	1