iq2000 port.

libgloss/iq2000/crt0.S

@@ -0,0 +1,56 @@
+##==============================================================================
+##
+##	crt0.S
+##
+##	IQ2000 startup code
+##
+##==============================================================================
+##
+## Copyright (c) 2000, Cygnus Solutions, A Red Hat Company
+## 
+## 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:
+	lui %29,%hi(__stack)
+	ori %29,%29,%lo(__stack)
+
+	lui %24,%hi(_edata)	# get start of bss
+	ori %24,%24,%lo(_edata)
+
+	lui %25,%hi(_end)	# get end of bss
+	ori %25,%25,%lo(_end)
+
+	beq	%24,%25,.L0	# check if end and start are the same
+				# do nothing if no bss
+	
+.L1:
+	sb %0,0(%24)		#  clear a byte and bump pointer
+	addi %24,%24,1
+	bne %24,%25,.L1
+	nop
+	
+.L0:
+	jal  _main		# call _main to run ctors/dtors
+	nop
+	xor %4,%4,%4
+	jal main		# call main program
+	xor %5,%5,%5
+	jal exit		# all done, no need to return or
+	or %4,%0,%2		# exit with main's return value