crt0.s

来自「SH 的 Diab C源码。包括启动程序crt0.s」· S 代码 · 共 33 行

#
#	example/sh/crt0.s: startup for Bubble Sort example
#
#	*** Simplified version for Bubble Sort example only. ***
#	*** See src/crtsh/crt0.s for complete version.	     ***
#	--------------------------------------------------------
#
#	Copyright 2000 Wind River Systems, Inc.

	.file		"crt0.c"
	.text
	.global		_start
	.align		4

_start:
	movv		__SP_INIT,r15	# Initialize stack pointer r15 to value
					# in linker command file.
	mov		#0,r0		# Initialize link register r15 and
	mov.l		r0,@-r15	# terminate stack.

#
# Insert other initialization code here.
#
	movv		#0x0a00,r0	# Set "I/O" port value to byte-swapped
	movv		_input_count,r1	#   10 (for bubble sort example only).
	mov.l		r0,@r1

	movv		___init_main,r0	# Finish initialization (copies .data
	jsr		@r0		# ROM to RAM, clears .bss), then calls
	nop				# example main(), which calls exit(),
					# which halts.