c-struct.s

一个编译器的例子,基于c语言,在linux下开发 现在了简单的c语言例子

				# start of the file
.include "defines.h"		# system call numbers
.include "c-struct.literals"	# include the string literal file
	.global _start	
	.bss
	.align	4
_data:
	.skip		24	# global variables' size
.text
	.align	4
_start:
	pushl %ebp		# save the ebp address
	movl %esp, %ebp
	subl $1200, %esp		# allocate space for local variables
	leal _data+20, %eax
	pushl %eax
	pushl $0
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $1
	sall $2, (%esp)
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $100
	popl %ebx
	popl %eax
	movl %ebx, (%eax)
	pushl (%eax)
	popl %eax
	leal -1200(%ebp), %eax
	pushl %eax
	pushl $1
	sall $2, (%esp)
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $0
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $2
	sall $2, (%esp)
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $10
	popl %ebx
	popl %eax
	movl %ebx, (%eax)
	pushl (%eax)
	popl %eax
	leal _data+20, %eax
	pushl %eax
	pushl $20
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $10
	leal -1200(%ebp), %eax
	pushl %eax
	pushl $1
	sall $2, (%esp)
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $0
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $2
	sall $2, (%esp)
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	popl %eax
	pushl (%eax)
				# arithmetic calculate
	popl %ebx
	popl %eax
	imull %ebx, %eax
	pushl %eax
	pushl $9
	leal _data+20, %eax
	pushl %eax
	pushl $0
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	pushl $1
	sall $2, (%esp)
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	popl %eax
	pushl (%eax)
				# arithmetic calculate
	popl %ebx
	popl %eax
	imull %ebx, %eax
	pushl %eax
				# arithmetic calculate
	popl %ebx
	addl %ebx, (%esp)
	popl %ebx
	popl %eax
	movl %ebx, (%eax)
	pushl (%eax)
	popl %eax
	movl $SYS_write, %eax	# load the write call number
	movl $STDOUT, %ebx		# get the output channel
	movl $literal0,%ecx		# get the literal string
	movl $len0,%edx		# string length
	int $0x80
	leal _data+20, %eax
	pushl %eax
	pushl $20
	popl %ebx
	popl %eax
	addl %ebx, %eax
	pushl %eax
	popl %ebx
	movl (%ebx), %eax
	call ishow
	call newline
	pushl $0
	popl %eax		# save the return value in eax
	movl %ebp, %esp
	popl %ebp		# restore the ebp address
	movl $SYS_exit,%eax	# load the exit call number
	movl $0,%ebx		# load the exit code
	int $0x80		# and exit!
				# end of the file